ftpd.c revision 1.101
1 /* $NetBSD: ftpd.c,v 1.101 2000/07/23 14:40:48 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Luke Mewburn. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 41 * The Regents of the University of California. All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 */ 71 72 /* 73 * Copyright (C) 1997 and 1998 WIDE Project. 74 * All rights reserved. 75 * 76 * Redistribution and use in source and binary forms, with or without 77 * modification, are permitted provided that the following conditions 78 * are met: 79 * 1. Redistributions of source code must retain the above copyright 80 * notice, this list of conditions and the following disclaimer. 81 * 2. Redistributions in binary form must reproduce the above copyright 82 * notice, this list of conditions and the following disclaimer in the 83 * documentation and/or other materials provided with the distribution. 84 * 3. Neither the name of the project nor the names of its contributors 85 * may be used to endorse or promote products derived from this software 86 * without specific prior written permission. 87 * 88 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 89 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 90 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 91 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 92 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 93 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 94 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 95 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 96 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 97 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 98 * SUCH DAMAGE. 99 */ 100 101 #include <sys/cdefs.h> 102 #ifndef lint 103 __COPYRIGHT( 104 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 105 The Regents of the University of California. All rights reserved.\n"); 106 #endif /* not lint */ 107 108 #ifndef lint 109 #if 0 110 static char sccsid[] = "@(#)ftpd.c 8.5 (Berkeley) 4/28/95"; 111 #else 112 __RCSID("$NetBSD: ftpd.c,v 1.101 2000/07/23 14:40:48 lukem Exp $"); 113 #endif 114 #endif /* not lint */ 115 116 /* 117 * FTP server. 118 */ 119 #include <sys/param.h> 120 #include <sys/stat.h> 121 #include <sys/ioctl.h> 122 #include <sys/socket.h> 123 #include <sys/wait.h> 124 125 #include <netinet/in.h> 126 #include <netinet/in_systm.h> 127 #include <netinet/ip.h> 128 129 #define FTP_NAMES 130 #include <arpa/ftp.h> 131 #include <arpa/inet.h> 132 #include <arpa/telnet.h> 133 134 #include <ctype.h> 135 #include <dirent.h> 136 #include <err.h> 137 #include <errno.h> 138 #include <fcntl.h> 139 #include <fnmatch.h> 140 #include <glob.h> 141 #include <grp.h> 142 #include <limits.h> 143 #include <netdb.h> 144 #include <pwd.h> 145 #include <setjmp.h> 146 #include <signal.h> 147 #include <stdarg.h> 148 #include <stdio.h> 149 #include <stdlib.h> 150 #include <string.h> 151 #include <syslog.h> 152 #include <time.h> 153 #include <unistd.h> 154 #include <util.h> 155 #include <utmp.h> 156 #ifdef SKEY 157 #include <skey.h> 158 #endif 159 #ifdef KERBEROS5 160 #include <com_err.h> 161 #include <krb5/krb5.h> 162 #endif 163 164 #define GLOBAL 165 #include "extern.h" 166 #include "pathnames.h" 167 #include "version.h" 168 169 int data; 170 jmp_buf urgcatch; 171 struct passwd *pw; 172 int sflag; 173 int stru; /* avoid C keyword */ 174 int mode; 175 int doutmp; /* update utmp file */ 176 int dropprivs; /* if privileges should or have been dropped */ 177 int mapped; /* IPv4 connection on AF_INET6 socket */ 178 off_t file_size; 179 off_t byte_count; 180 static char ttyline[20]; 181 static struct utmp utmp; /* for utmp */ 182 183 static char *anondir = NULL; 184 static char confdir[MAXPATHLEN]; 185 186 #if defined(KERBEROS) || defined(KERBEROS5) 187 int has_ccache = 0; 188 int notickets = 1; 189 char *krbtkfile_env = NULL; 190 char *tty = ttyline; 191 int login_krb5_forwardable_tgt = 0; 192 #endif 193 194 int epsvall = 0; 195 196 /* 197 * Timeout intervals for retrying connections 198 * to hosts that don't accept PORT cmds. This 199 * is a kludge, but given the problems with TCP... 200 */ 201 #define SWAITMAX 90 /* wait at most 90 seconds */ 202 #define SWAITINT 5 /* interval between retries */ 203 204 int swaitmax = SWAITMAX; 205 int swaitint = SWAITINT; 206 207 static int bind_pasv_addr(void); 208 static int checkuser(const char *, const char *, int, int, char **); 209 static int checkaccess(const char *); 210 static void dolog(struct sockaddr *); 211 static void end_login(void); 212 static FILE *getdatasock(const char *); 213 static char *gunique(const char *); 214 static void lostconn(int); 215 static void myoob(int); 216 static int receive_data(FILE *, FILE *); 217 static int send_data(FILE *, FILE *, off_t, int); 218 static struct passwd *sgetpwnam(const char *); 219 220 int main(int, char *[]); 221 222 #if defined(KERBEROS) 223 int klogin(struct passwd *, char *, char *, char *); 224 void kdestroy(void); 225 #endif 226 #if defined(KERBEROS5) 227 int k5login(struct passwd *, char *, char *, char *); 228 void k5destroy(void); 229 #endif 230 231 int 232 main(int argc, char *argv[]) 233 { 234 int addrlen, ch, on = 1, tos, keepalive; 235 #ifdef KERBEROS5 236 krb5_error_code kerror; 237 #endif 238 239 connections = 1; 240 debug = 0; 241 logging = 0; 242 pdata = -1; 243 sflag = 0; 244 doutmp = 0; 245 dropprivs = 0; 246 mapped = 0; 247 usedefault = 1; 248 (void)strcpy(confdir, _DEFAULT_CONFDIR); 249 hostname[0] = '\0'; 250 homedir[0] = '\0'; 251 gidcount = 0; 252 253 version = FTPD_VERSION; 254 while ((ch = getopt(argc, argv, "a:c:C:dh:Hlrst:T:u:UvV:")) != -1) { 255 switch (ch) { 256 case 'a': 257 anondir = optarg; 258 break; 259 260 case 'c': 261 (void)strlcpy(confdir, optarg, sizeof(confdir)); 262 break; 263 264 case 'C': 265 pw = sgetpwnam(optarg); 266 exit(checkaccess(optarg) ? 0 : 1); 267 /* NOTREACHED */ 268 269 case 'd': 270 case 'v': /* deprecated */ 271 debug = 1; 272 break; 273 274 case 'h': 275 strlcpy(hostname, optarg, sizeof(hostname)); 276 break; 277 278 case 'H': 279 if (gethostname(hostname, sizeof(hostname)) == -1) 280 hostname[0] = '\0'; 281 hostname[sizeof(hostname) - 1] = '\0'; 282 break; 283 284 case 'l': 285 logging++; /* > 1 == extra logging */ 286 break; 287 288 case 'r': 289 dropprivs = 1; 290 break; 291 292 case 's': 293 sflag = 1; 294 break; 295 296 case 't': 297 case 'T': 298 case 'u': 299 warnx("-%c has been deprecated in favour of ftpd.conf", 300 ch); 301 break; 302 303 case 'U': 304 doutmp = 1; 305 break; 306 307 case 'V': 308 if (EMPTYSTR(optarg) || strcmp(optarg, "-") == 0) 309 version = NULL; 310 else 311 version = xstrdup(optarg); 312 break; 313 314 default: 315 if (optopt == 'a' || optopt == 'C') 316 exit(1); 317 warnx("unknown flag -%c ignored", optopt); 318 break; 319 } 320 } 321 322 /* 323 * LOG_NDELAY sets up the logging connection immediately, 324 * necessary for anonymous ftp's that chroot and can't do it later. 325 */ 326 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 327 addrlen = sizeof(his_addr); /* xxx */ 328 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 329 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 330 exit(1); 331 } 332 addrlen = sizeof(ctrl_addr); 333 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 334 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 335 exit(1); 336 } 337 if (his_addr.su_family == AF_INET6 338 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 339 #if 1 340 /* 341 * IPv4 control connection arrived to AF_INET6 socket. 342 * I hate to do this, but this is the easiest solution. 343 * 344 * The assumption is untrue on SIIT environment. 345 */ 346 union sockunion tmp_addr; 347 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 348 349 tmp_addr = his_addr; 350 memset(&his_addr, 0, sizeof(his_addr)); 351 his_addr.su_sin.sin_family = AF_INET; 352 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 353 memcpy(&his_addr.su_sin.sin_addr, 354 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 355 sizeof(his_addr.su_sin.sin_addr)); 356 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 357 358 tmp_addr = ctrl_addr; 359 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 360 ctrl_addr.su_sin.sin_family = AF_INET; 361 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 362 memcpy(&ctrl_addr.su_sin.sin_addr, 363 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 364 sizeof(ctrl_addr.su_sin.sin_addr)); 365 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 366 #else 367 while (fgets(line, sizeof(line), fd) != NULL) { 368 if ((cp = strchr(line, '\n')) != NULL) 369 *cp = '\0'; 370 reply(-530, "%s", line); 371 } 372 (void) fflush(stdout); 373 (void) fclose(fd); 374 reply(530, 375 "Connection from IPv4 mapped address is not supported."); 376 exit(0); 377 #endif 378 379 mapped = 1; 380 } else 381 mapped = 0; 382 #ifdef IP_TOS 383 if (!mapped && his_addr.su_family == AF_INET) { 384 tos = IPTOS_LOWDELAY; 385 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 386 sizeof(int)) < 0) 387 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 388 } 389 #endif 390 /* if the hostname hasn't been given, attempt to determine it */ 391 if (hostname[0] == '\0') { 392 if (getnameinfo((struct sockaddr *)&ctrl_addr, ctrl_addr.su_len, 393 hostname, sizeof(hostname), NULL, 0, 0) != 0) 394 (void)gethostname(hostname, sizeof(hostname)); 395 hostname[sizeof(hostname) - 1] = '\0'; 396 } 397 398 /* set this here so klogin can use it... */ 399 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 400 401 (void) freopen(_PATH_DEVNULL, "w", stderr); 402 (void) signal(SIGPIPE, lostconn); 403 (void) signal(SIGCHLD, SIG_IGN); 404 if (signal(SIGURG, myoob) == SIG_ERR) 405 syslog(LOG_ERR, "signal: %m"); 406 407 /* Try to handle urgent data inline */ 408 #ifdef SO_OOBINLINE 409 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 410 syslog(LOG_ERR, "setsockopt: %m"); 411 #endif 412 /* Set keepalives on the socket to detect dropped connections. */ 413 #ifdef SO_KEEPALIVE 414 keepalive = 1; 415 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 416 sizeof(int)) < 0) 417 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 418 #endif 419 420 #ifdef F_SETOWN 421 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 422 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 423 #endif 424 dolog((struct sockaddr *)&his_addr); 425 /* 426 * Set up default state 427 */ 428 data = -1; 429 type = TYPE_A; 430 form = FORM_N; 431 stru = STRU_F; 432 mode = MODE_S; 433 tmpline[0] = '\0'; 434 hasyyerrored = 0; 435 436 #ifdef KERBEROS5 437 kerror = krb5_init_context(&kcontext); 438 if (kerror) { 439 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 440 error_message(kerror)); 441 exit(0); 442 } 443 #endif /* KERBEROS5 */ 444 445 init_curclass(); 446 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 447 curclass.type = CLASS_REAL; 448 449 /* If logins are disabled, print out the message. */ 450 if (display_file(_PATH_NOLOGIN, 530)) { 451 reply(530, "System not available."); 452 exit(0); 453 } 454 (void)display_file(conffilename(_PATH_FTPWELCOME), 220); 455 /* reply(220,) must follow */ 456 if (EMPTYSTR(version)) 457 reply(220, "%s FTP server ready.", hostname); 458 else 459 reply(220, "%s FTP server (%s) ready.", hostname, version); 460 461 (void) setjmp(errcatch); 462 for (;;) 463 (void) yyparse(); 464 /* NOTREACHED */ 465 } 466 467 static void 468 lostconn(int signo) 469 { 470 471 if (debug) 472 syslog(LOG_DEBUG, "lost connection"); 473 dologout(1); 474 } 475 476 /* 477 * Save the result of a getpwnam. Used for USER command, since 478 * the data returned must not be clobbered by any other command 479 * (e.g., globbing). 480 */ 481 static struct passwd * 482 sgetpwnam(const char *name) 483 { 484 static struct passwd save; 485 struct passwd *p; 486 487 if ((p = getpwnam(name)) == NULL) 488 return (p); 489 if (save.pw_name) { 490 free((char *)save.pw_name); 491 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 492 free((char *)save.pw_passwd); 493 free((char *)save.pw_gecos); 494 free((char *)save.pw_dir); 495 free((char *)save.pw_shell); 496 } 497 save = *p; 498 save.pw_name = xstrdup(p->pw_name); 499 save.pw_passwd = xstrdup(p->pw_passwd); 500 save.pw_gecos = xstrdup(p->pw_gecos); 501 save.pw_dir = xstrdup(p->pw_dir); 502 save.pw_shell = xstrdup(p->pw_shell); 503 return (&save); 504 } 505 506 static int login_attempts; /* number of failed login attempts */ 507 static int askpasswd; /* had user command, ask for passwd */ 508 static char curname[10]; /* current USER name */ 509 510 /* 511 * USER command. 512 * Sets global passwd pointer pw if named account exists and is acceptable; 513 * sets askpasswd if a PASS command is expected. If logged in previously, 514 * need to reset state. If name is "ftp" or "anonymous", the name is not in 515 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 516 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 517 * requesting login privileges. Disallow anyone who does not have a standard 518 * shell as returned by getusershell(). Disallow anyone mentioned in the file 519 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 520 */ 521 void 522 user(const char *name) 523 { 524 if (logged_in) { 525 switch (curclass.type) { 526 case CLASS_GUEST: 527 reply(530, "Can't change user from guest login."); 528 return; 529 case CLASS_CHROOT: 530 reply(530, "Can't change user from chroot user."); 531 return; 532 case CLASS_REAL: 533 if (dropprivs) { 534 reply(530, "Can't change user."); 535 return; 536 } 537 end_login(); 538 break; 539 default: 540 abort(); 541 } 542 } 543 544 #if defined(KERBEROS) 545 kdestroy(); 546 #endif 547 #if defined(KERBEROS5) 548 k5destroy(); 549 #endif 550 551 curclass.type = CLASS_REAL; 552 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 553 /* need `pw' setup for checkaccess() and checkuser () */ 554 if ((pw = sgetpwnam("ftp")) == NULL) 555 reply(530, "User %s unknown.", name); 556 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 557 reply(530, "User %s access denied.", name); 558 else { 559 curclass.type = CLASS_GUEST; 560 askpasswd = 1; 561 reply(331, 562 "Guest login ok, type your name as password."); 563 } 564 if (!askpasswd && logging) 565 syslog(LOG_NOTICE, 566 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 567 return; 568 } 569 570 pw = sgetpwnam(name); 571 if (logging) 572 strlcpy(curname, name, sizeof(curname)); 573 574 #ifdef SKEY 575 if (skey_haskey(name) == 0) { 576 char *myskey; 577 578 myskey = skey_keyinfo(name); 579 reply(331, "Password [%s] required for %s.", 580 myskey ? myskey : "error getting challenge", name); 581 } else 582 #endif 583 reply(331, "Password required for %s.", name); 584 585 askpasswd = 1; 586 /* 587 * Delay before reading passwd after first failed 588 * attempt to slow down passwd-guessing programs. 589 */ 590 if (login_attempts) 591 sleep((unsigned) login_attempts); 592 } 593 594 /* 595 * Determine whether something is to happen (allow access, chroot) 596 * for a user. Each line is a shell-style glob followed by 597 * `yes' or `no'. 598 * 599 * For backward compatability, `allow' and `deny' are synonymns 600 * for `yes' and `no', respectively. 601 * 602 * Each glob is matched against the username in turn, and the first 603 * match found is used. If no match is found, the result is the 604 * argument `def'. If a match is found but without and explicit 605 * `yes'/`no', the result is the opposite of def. 606 * 607 * If the file doesn't exist at all, the result is the argument 608 * `nofile' 609 * 610 * Any line starting with `#' is considered a comment and ignored. 611 * 612 * Returns 0 if the user is denied, or 1 if they are allowed. 613 * 614 * NOTE: needs struct passwd *pw setup before use. 615 */ 616 int 617 checkuser(const char *fname, const char *name, int def, int nofile, 618 char **retclass) 619 { 620 FILE *fd; 621 int retval; 622 char *glob, *perm, *class, *buf, *p; 623 size_t len, line; 624 625 retval = def; 626 if (retclass != NULL) 627 *retclass = NULL; 628 if ((fd = fopen(conffilename(fname), "r")) == NULL) 629 return nofile; 630 631 line = 0; 632 for (; 633 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 634 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 635 free(buf), buf = NULL) { 636 glob = perm = class = NULL; 637 p = buf; 638 if (len < 1) 639 continue; 640 if (p[len - 1] == '\n') 641 p[--len] = '\0'; 642 if (EMPTYSTR(p)) 643 continue; 644 645 NEXTWORD(p, glob); 646 NEXTWORD(p, perm); 647 NEXTWORD(p, class); 648 if (EMPTYSTR(glob)) 649 continue; 650 if (!EMPTYSTR(class)) { 651 if (strcasecmp(class, "all") == 0 || 652 strcasecmp(class, "none") == 0) { 653 syslog(LOG_WARNING, 654 "%s line %d: illegal user-defined class `%s' - skipping entry", 655 fname, (int)line, class); 656 continue; 657 } 658 } 659 660 /* have a host specifier */ 661 if ((p = strchr(glob, '@')) != NULL) { 662 u_int32_t net, mask, addr; 663 int bits; 664 665 *p++ = '\0'; 666 /* check against network or CIDR */ 667 if (isdigit(*p) && 668 (bits = inet_net_pton(AF_INET, p, 669 &net, sizeof(net))) != -1) { 670 net = ntohl(net); 671 mask = 0xffffffffU << (32 - bits); 672 addr = ntohl(his_addr.su_sin.sin_addr.s_addr); 673 if ((addr & mask) != net) 674 continue; 675 676 /* check against hostname glob */ 677 } else if (fnmatch(p, remotehost, 0) != 0) 678 continue; 679 } 680 681 /* have a group specifier */ 682 if ((p = strchr(glob, ':')) != NULL) { 683 gid_t *groups, *ng; 684 int gsize, i, found; 685 686 *p++ = '\0'; 687 groups = NULL; 688 gsize = 16; 689 do { 690 ng = realloc(groups, gsize * sizeof(gid_t)); 691 if (ng == NULL) 692 fatal( 693 "Local resource failure: realloc"); 694 groups = ng; 695 } while (getgrouplist(pw->pw_name, pw->pw_gid, 696 groups, &gsize) == -1); 697 found = 0; 698 for (i = 0; i < gsize; i++) { 699 struct group *g; 700 701 if ((g = getgrgid(groups[i])) == NULL) 702 continue; 703 if (fnmatch(p, g->gr_name, 0) == 0) { 704 found = 1; 705 break; 706 } 707 } 708 free(groups); 709 if (!found) 710 continue; 711 } 712 713 /* check against username glob */ 714 if (fnmatch(glob, name, 0) != 0) 715 continue; 716 717 if (perm != NULL && 718 ((strcasecmp(perm, "allow") == 0) || 719 (strcasecmp(perm, "yes") == 0))) 720 retval = 1; 721 else if (perm != NULL && 722 ((strcasecmp(perm, "deny") == 0) || 723 (strcasecmp(perm, "no") == 0))) 724 retval = 0; 725 else 726 retval = !def; 727 if (!EMPTYSTR(class) && retclass != NULL) 728 *retclass = xstrdup(class); 729 free(buf); 730 break; 731 } 732 (void) fclose(fd); 733 return (retval); 734 } 735 736 /* 737 * Check if user is allowed by /etc/ftpusers 738 * returns 1 for yes, 0 for no 739 * 740 * NOTE: needs struct passwd *pw setup (for checkuser()) 741 */ 742 int 743 checkaccess(const char *name) 744 { 745 746 return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL)); 747 } 748 749 /* 750 * Terminate login as previous user, if any, resetting state; 751 * used when USER command is given or login fails. 752 */ 753 static void 754 end_login(void) 755 { 756 757 if (logged_in) { 758 logwtmp(ttyline, "", ""); 759 if (doutmp) 760 logout(utmp.ut_line); 761 } 762 /* reset login state */ 763 (void) seteuid((uid_t)0); 764 pw = NULL; 765 logged_in = 0; 766 quietmessages = 0; 767 gidcount = 0; 768 curclass.type = CLASS_REAL; 769 } 770 771 void 772 pass(const char *passwd) 773 { 774 int rval; 775 const char *cp, *shell; 776 char *class, root[MAXPATHLEN]; 777 778 class = NULL; 779 if (logged_in || askpasswd == 0) { 780 reply(503, "Login with USER first."); 781 return; 782 } 783 askpasswd = 0; 784 if (curclass.type != CLASS_GUEST) { 785 /* "ftp" is the only account allowed with no password */ 786 if (pw == NULL) { 787 rval = 1; /* failure below */ 788 goto skip; 789 } 790 #if defined(KERBEROS) 791 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 792 rval = 0; 793 goto skip; 794 } 795 #endif 796 #if defined(KERBEROS5) 797 if (k5login(pw, "", hostname, (char *)passwd) == 0) { 798 rval = 0; 799 goto skip; 800 } 801 #endif 802 #ifdef SKEY 803 if (skey_haskey(pw->pw_name) == 0) { 804 char *p; 805 int r; 806 807 p = xstrdup(passwd); 808 r = skey_passcheck(pw->pw_name, p); 809 free(p); 810 if (r != -1) { 811 rval = 0; 812 goto skip; 813 } 814 } 815 #endif 816 if (!sflag && *pw->pw_passwd != '\0' && 817 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 818 rval = 0; 819 goto skip; 820 } 821 rval = 1; 822 823 skip: 824 if (pw != NULL && pw->pw_expire && time(NULL) >= pw->pw_expire) 825 rval = 2; 826 827 /* 828 * If rval > 0, the user failed the authentication check 829 * above. If rval == 0, either Kerberos or local 830 * authentication succeeded. 831 */ 832 if (rval) { 833 reply(530, "%s", rval == 2 ? "Password expired." : 834 "Login incorrect."); 835 if (logging) { 836 syslog(LOG_NOTICE, 837 "FTP LOGIN FAILED FROM %s", remotehost); 838 syslog(LOG_AUTHPRIV | LOG_NOTICE, 839 "FTP LOGIN FAILED FROM %s, %s", 840 remotehost, curname); 841 } 842 pw = NULL; 843 if (login_attempts++ >= 5) { 844 syslog(LOG_NOTICE, 845 "repeated login failures from %s", 846 remotehost); 847 exit(0); 848 } 849 return; 850 } 851 } 852 853 /* password ok; see if anything else prevents login */ 854 if (! checkuser(_PATH_FTPUSERS, pw->pw_name, 1, 0, &class)) { 855 reply(530, "User %s may not use FTP.", pw->pw_name); 856 if (logging) 857 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 858 remotehost, pw->pw_name); 859 goto bad; 860 } 861 /* if not guest user, check for valid shell */ 862 if ((shell = pw->pw_shell) == NULL || *shell == 0) 863 shell = _PATH_BSHELL; 864 while ((cp = getusershell()) != NULL) 865 if (strcmp(cp, shell) == 0) 866 break; 867 endusershell(); 868 if (cp == NULL && curclass.type != CLASS_GUEST) { 869 reply(530, "User %s may not use FTP.", pw->pw_name); 870 if (logging) 871 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 872 remotehost, pw->pw_name); 873 goto bad; 874 } 875 876 login_attempts = 0; /* this time successful */ 877 if (setegid((gid_t)pw->pw_gid) < 0) { 878 reply(550, "Can't set gid."); 879 goto bad; 880 } 881 (void) initgroups(pw->pw_name, pw->pw_gid); 882 /* cache groups for cmds.c::matchgroup() */ 883 gidcount = getgroups(sizeof(gidlist), gidlist); 884 885 /* open wtmp before chroot */ 886 logwtmp(ttyline, pw->pw_name, remotehost); 887 888 /* open utmp before chroot */ 889 if (doutmp) { 890 memset((void *)&utmp, 0, sizeof(utmp)); 891 (void)time(&utmp.ut_time); 892 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 893 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 894 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 895 login(&utmp); 896 } 897 898 logged_in = 1; 899 900 /* check user in /etc/ftpchroot */ 901 if (checkuser(_PATH_FTPCHROOT, pw->pw_name, 0, 0, NULL)) { 902 if (curclass.type == CLASS_GUEST) { 903 syslog(LOG_NOTICE, 904 "Can't change guest user to chroot class; remove entry in %s", 905 _PATH_FTPCHROOT); 906 exit(1); 907 } 908 curclass.type = CLASS_CHROOT; 909 } 910 if (class == NULL) { 911 switch (curclass.type) { 912 case CLASS_GUEST: 913 class = xstrdup("guest"); 914 break; 915 case CLASS_CHROOT: 916 class = xstrdup("chroot"); 917 break; 918 case CLASS_REAL: 919 class = xstrdup("real"); 920 break; 921 default: 922 abort(); 923 } 924 } 925 926 /* parse ftpd.conf, setting up various parameters */ 927 parse_conf(class); 928 count_users(); 929 if (curclass.limit != -1 && connections > curclass.limit) { 930 if (! EMPTYSTR(curclass.limitfile)) 931 (void)display_file(conffilename(curclass.limitfile), 932 530); 933 reply(530, 934 "User %s access denied, connection limit of %d reached.", 935 pw->pw_name, curclass.limit); 936 syslog(LOG_NOTICE, 937 "Maximum connection limit of %d for class %s reached, login refused for %s", 938 curclass.limit, curclass.classname, pw->pw_name); 939 goto bad; 940 } 941 942 homedir[0] = '/'; 943 switch (curclass.type) { 944 case CLASS_GUEST: 945 /* 946 * We MUST do a chdir() after the chroot. Otherwise 947 * the old current directory will be accessible as "." 948 * outside the new root! 949 */ 950 format_path(root, 951 curclass.chroot ? curclass.chroot : 952 anondir ? anondir : 953 pw->pw_dir); 954 format_path(homedir, 955 curclass.homedir ? curclass.homedir : 956 "/"); 957 if (EMPTYSTR(homedir)) 958 homedir[0] = '/'; 959 if (EMPTYSTR(root) || chroot(root) < 0) { 960 syslog(LOG_NOTICE, 961 "GUEST user %s: can't chroot to %s: %m", 962 pw->pw_name, root); 963 goto bad_guest; 964 } 965 if (chdir(homedir) < 0) { 966 syslog(LOG_NOTICE, 967 "GUEST user %s: can't chdir to %s: %m", 968 pw->pw_name, homedir); 969 bad_guest: 970 reply(550, "Can't set guest privileges."); 971 goto bad; 972 } 973 break; 974 case CLASS_CHROOT: 975 format_path(root, 976 curclass.chroot ? curclass.chroot : 977 pw->pw_dir); 978 format_path(homedir, 979 curclass.homedir ? curclass.homedir : 980 "/"); 981 if (EMPTYSTR(homedir)) 982 homedir[0] = '/'; 983 if (EMPTYSTR(root) || chroot(root) < 0) { 984 syslog(LOG_NOTICE, 985 "CHROOT user %s: can't chroot to %s: %m", 986 pw->pw_name, root); 987 goto bad_chroot; 988 } 989 if (chdir(homedir) < 0) { 990 syslog(LOG_NOTICE, 991 "CHROOT user %s: can't chdir to %s: %m", 992 pw->pw_name, homedir); 993 bad_chroot: 994 reply(550, "Can't change root."); 995 goto bad; 996 } 997 break; 998 case CLASS_REAL: 999 format_path(homedir, 1000 curclass.homedir ? curclass.homedir : 1001 pw->pw_dir); 1002 if (EMPTYSTR(homedir) || chdir(homedir) < 0) { 1003 if (chdir("/") < 0) { 1004 syslog(LOG_NOTICE, 1005 "REAL user %s: can't chdir to %s: %m", 1006 pw->pw_name, 1007 !EMPTYSTR(homedir) ? homedir : "/"); 1008 reply(530, 1009 "User %s: can't change directory to %s.", 1010 pw->pw_name, 1011 !EMPTYSTR(homedir) ? homedir : "/"); 1012 goto bad; 1013 } else { 1014 reply(-230, 1015 "No directory! Logging in with home=/"); 1016 homedir[0] = '/'; 1017 } 1018 } 1019 break; 1020 } 1021 if (dropprivs || 1022 (curclass.type != CLASS_REAL && 1023 ntohs(ctrl_addr.su_port) > IPPORT_RESERVED + 1)) { 1024 dropprivs++; 1025 if (setgid((gid_t)pw->pw_gid) < 0) { 1026 reply(550, "Can't set gid."); 1027 goto bad; 1028 } 1029 if (setuid((uid_t)pw->pw_uid) < 0) { 1030 reply(550, "Can't set uid."); 1031 goto bad; 1032 } 1033 } else { 1034 if (seteuid((uid_t)pw->pw_uid) < 0) { 1035 reply(550, "Can't set uid."); 1036 goto bad; 1037 } 1038 } 1039 setenv("HOME", homedir, 1); 1040 1041 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 1042 quietmessages = 1; 1043 1044 /* 1045 * Display a login message, if it exists. 1046 * N.B. reply(230,) must follow the message. 1047 */ 1048 (void)display_file(conffilename(curclass.motd), 230); 1049 show_chdir_messages(230); 1050 if (curclass.type == CLASS_GUEST) { 1051 reply(230, "Guest login ok, access restrictions apply."); 1052 #ifdef HASSETPROCTITLE 1053 snprintf(proctitle, sizeof(proctitle), 1054 "%s: anonymous/%.*s", remotehost, 1055 (int) (sizeof(proctitle) - sizeof(remotehost) - 1056 sizeof(": anonymous/")), passwd); 1057 setproctitle("%s", proctitle); 1058 #endif /* HASSETPROCTITLE */ 1059 if (logging) 1060 syslog(LOG_INFO, 1061 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 1062 remotehost, passwd, 1063 curclass.classname, CURCLASSTYPE); 1064 } else { 1065 reply(230, "User %s logged in.", pw->pw_name); 1066 #ifdef HASSETPROCTITLE 1067 snprintf(proctitle, sizeof(proctitle), 1068 "%s: %s", remotehost, pw->pw_name); 1069 setproctitle("%s", proctitle); 1070 #endif /* HASSETPROCTITLE */ 1071 if (logging) 1072 syslog(LOG_INFO, 1073 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1074 remotehost, pw->pw_name, 1075 curclass.classname, CURCLASSTYPE); 1076 } 1077 (void) umask(curclass.umask); 1078 goto cleanuppass; 1079 bad: 1080 /* Forget all about it... */ 1081 end_login(); 1082 cleanuppass: 1083 if (class) 1084 free(class); 1085 } 1086 1087 void 1088 retrieve(char *argv[], const char *name) 1089 { 1090 FILE *fin, *dout; 1091 struct stat st; 1092 int (*closefunc)(FILE *) = NULL; 1093 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1094 struct timeval start, finish, td, *tdp; 1095 const char *dispname; 1096 1097 sendrv = closerv = stderrfd = -1; 1098 isconversion = isdata = isls = log = 0; 1099 tdp = NULL; 1100 dispname = name; 1101 fin = dout = NULL; 1102 if (argv == NULL) { 1103 log = 1; 1104 isdata = 1; 1105 fin = fopen(name, "r"); 1106 closefunc = fclose; 1107 if (fin == NULL) 1108 argv = do_conversion(name); 1109 if (argv != NULL) { 1110 isconversion++; 1111 syslog(LOG_INFO, "get command: '%s' on '%s'", 1112 argv[0], name); 1113 } 1114 } 1115 if (argv != NULL) { 1116 char temp[MAXPATHLEN]; 1117 1118 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1119 isls = 1; 1120 stderrfd = -1; 1121 } else { 1122 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1123 stderrfd = mkstemp(temp); 1124 if (stderrfd != -1) 1125 (void)unlink(temp); 1126 } 1127 dispname = argv[0]; 1128 fin = ftpd_popen(argv, "r", stderrfd); 1129 closefunc = ftpd_pclose; 1130 st.st_size = -1; 1131 st.st_blksize = BUFSIZ; 1132 } 1133 if (fin == NULL) { 1134 if (errno != 0) { 1135 perror_reply(550, dispname); 1136 if (log) 1137 logcmd("get", -1, name, NULL, NULL, 1138 strerror(errno)); 1139 } 1140 goto cleanupretrieve; 1141 } 1142 byte_count = -1; 1143 if (argv == NULL 1144 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1145 reply(550, "%s: not a plain file.", dispname); 1146 goto done; 1147 } 1148 if (restart_point) { 1149 if (type == TYPE_A) { 1150 off_t i; 1151 int c; 1152 1153 for (i = 0; i < restart_point; i++) { 1154 if ((c=getc(fin)) == EOF) { 1155 perror_reply(550, dispname); 1156 goto done; 1157 } 1158 if (c == '\n') 1159 i++; 1160 } 1161 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1162 perror_reply(550, dispname); 1163 goto done; 1164 } 1165 } 1166 dout = dataconn(dispname, st.st_size, "w"); 1167 if (dout == NULL) 1168 goto done; 1169 1170 (void)gettimeofday(&start, NULL); 1171 sendrv = send_data(fin, dout, st.st_blksize, isdata); 1172 (void)gettimeofday(&finish, NULL); 1173 (void) fclose(dout); /* close now to affect timing stats */ 1174 dout = NULL; 1175 timersub(&finish, &start, &td); 1176 tdp = &td; 1177 done: 1178 if (log) 1179 logcmd("get", byte_count, name, NULL, tdp, NULL); 1180 closerv = (*closefunc)(fin); 1181 if (sendrv == 0) { 1182 FILE *err; 1183 struct stat sb; 1184 1185 if (!isls && argv != NULL && closerv != 0) { 1186 reply(-226, 1187 "Command returned an exit status of %d", 1188 closerv); 1189 if (isconversion) 1190 syslog(LOG_INFO, 1191 "retrieve command: '%s' returned %d", 1192 argv[0], closerv); 1193 } 1194 if (!isls && argv != NULL && stderrfd != -1 && 1195 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1196 ((err = fdopen(stderrfd, "r")) != NULL)) { 1197 char *cp, line[LINE_MAX]; 1198 1199 reply(-226, "Command error messages:"); 1200 rewind(err); 1201 while (fgets(line, sizeof(line), err) != NULL) { 1202 if ((cp = strchr(line, '\n')) != NULL) 1203 *cp = '\0'; 1204 reply(0, " %s", line); 1205 } 1206 (void) fflush(stdout); 1207 (void) fclose(err); 1208 /* a reply(226,) must follow */ 1209 } 1210 reply(226, "Transfer complete."); 1211 } 1212 cleanupretrieve: 1213 closedataconn(dout); 1214 if (stderrfd != -1) 1215 (void)close(stderrfd); 1216 if (isconversion) 1217 free(argv); 1218 } 1219 1220 void 1221 store(const char *name, const char *mode, int unique) 1222 { 1223 FILE *fout, *din; 1224 struct stat st; 1225 int (*closefunc)(FILE *); 1226 struct timeval start, finish, td, *tdp; 1227 char *desc; 1228 1229 din = NULL; 1230 desc = (*mode == 'w') ? "put" : "append"; 1231 if (unique && stat(name, &st) == 0 && 1232 (name = gunique(name)) == NULL) { 1233 logcmd(desc, -1, name, NULL, NULL, "cannot create unique file"); 1234 goto cleanupstore; 1235 } 1236 1237 if (restart_point) 1238 mode = "r+"; 1239 fout = fopen(name, mode); 1240 closefunc = fclose; 1241 tdp = NULL; 1242 if (fout == NULL) { 1243 perror_reply(553, name); 1244 logcmd(desc, -1, name, NULL, NULL, strerror(errno)); 1245 goto cleanupstore; 1246 } 1247 byte_count = -1; 1248 if (restart_point) { 1249 if (type == TYPE_A) { 1250 off_t i; 1251 int c; 1252 1253 for (i = 0; i < restart_point; i++) { 1254 if ((c=getc(fout)) == EOF) { 1255 perror_reply(550, name); 1256 goto done; 1257 } 1258 if (c == '\n') 1259 i++; 1260 } 1261 /* 1262 * We must do this seek to "current" position 1263 * because we are changing from reading to 1264 * writing. 1265 */ 1266 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1267 perror_reply(550, name); 1268 goto done; 1269 } 1270 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1271 perror_reply(550, name); 1272 goto done; 1273 } 1274 } 1275 din = dataconn(name, (off_t)-1, "r"); 1276 if (din == NULL) 1277 goto done; 1278 (void)gettimeofday(&start, NULL); 1279 if (receive_data(din, fout) == 0) { 1280 if (unique) 1281 reply(226, "Transfer complete (unique file name:%s).", 1282 name); 1283 else 1284 reply(226, "Transfer complete."); 1285 } 1286 (void)gettimeofday(&finish, NULL); 1287 (void) fclose(din); /* close now to affect timing stats */ 1288 din = NULL; 1289 timersub(&finish, &start, &td); 1290 tdp = &td; 1291 done: 1292 logcmd(desc, byte_count, name, NULL, tdp, NULL); 1293 (*closefunc)(fout); 1294 cleanupstore: 1295 closedataconn(din); 1296 } 1297 1298 static FILE * 1299 getdatasock(const char *mode) 1300 { 1301 int on, s, t, tries; 1302 in_port_t port; 1303 1304 on = 1; 1305 if (data >= 0) 1306 return (fdopen(data, mode)); 1307 if (! dropprivs) 1308 (void) seteuid((uid_t)0); 1309 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1310 if (s < 0) 1311 goto bad; 1312 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1313 (char *) &on, sizeof(on)) < 0) 1314 goto bad; 1315 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1316 (char *) &on, sizeof(on)) < 0) 1317 goto bad; 1318 /* anchor socket to avoid multi-homing problems */ 1319 data_source = ctrl_addr; 1320 /* 1321 * By default source port for PORT connctions is 1322 * ctrlport-1 (see RFC959 section 5.2). 1323 * However, if privs have been dropped and that 1324 * would be < IPPORT_RESERVED, use a random port 1325 * instead. 1326 */ 1327 port = ntohs(ctrl_addr.su_port) - 1; 1328 if (dropprivs && port < IPPORT_RESERVED) 1329 port = 0; /* use random port */ 1330 data_source.su_port = htons(port); 1331 1332 for (tries = 1; ; tries++) { 1333 if (bind(s, (struct sockaddr *)&data_source, 1334 data_source.su_len) >= 0) 1335 break; 1336 if (errno != EADDRINUSE || tries > 10) 1337 goto bad; 1338 sleep(tries); 1339 } 1340 if (! dropprivs) 1341 (void) seteuid((uid_t)pw->pw_uid); 1342 #ifdef IP_TOS 1343 if (!mapped && ctrl_addr.su_family == AF_INET) { 1344 on = IPTOS_THROUGHPUT; 1345 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1346 sizeof(int)) < 0) 1347 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1348 } 1349 #endif 1350 return (fdopen(s, mode)); 1351 bad: 1352 /* Return the real value of errno (close may change it) */ 1353 t = errno; 1354 if (! dropprivs) 1355 (void) seteuid((uid_t)pw->pw_uid); 1356 (void) close(s); 1357 errno = t; 1358 return (NULL); 1359 } 1360 1361 FILE * 1362 dataconn(const char *name, off_t size, const char *mode) 1363 { 1364 char sizebuf[32]; 1365 FILE *file; 1366 int retry = 0, tos, keepalive; 1367 1368 file_size = size; 1369 byte_count = 0; 1370 if (size != (off_t) -1) 1371 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd byte%s)", 1372 (qdfmt_t)size, PLURAL(size)); 1373 else 1374 sizebuf[0] = '\0'; 1375 if (pdata >= 0) { 1376 union sockunion from; 1377 int s, fromlen = sizeof(from); 1378 1379 (void) alarm(curclass.timeout); 1380 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1381 (void) alarm(0); 1382 if (s < 0) { 1383 reply(425, "Can't open data connection."); 1384 (void) close(pdata); 1385 pdata = -1; 1386 return (NULL); 1387 } 1388 (void) close(pdata); 1389 pdata = s; 1390 switch (from.su_family) { 1391 case AF_INET: 1392 #ifdef IP_TOS 1393 if (!mapped) { 1394 tos = IPTOS_THROUGHPUT; 1395 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1396 (char *)&tos, sizeof(int)); 1397 } 1398 break; 1399 #endif 1400 } 1401 /* Set keepalives on the socket to detect dropped conns. */ 1402 #ifdef SO_KEEPALIVE 1403 keepalive = 1; 1404 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1405 (char *)&keepalive, sizeof(int)); 1406 #endif 1407 reply(150, "Opening %s mode data connection for '%s'%s.", 1408 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1409 return (fdopen(pdata, mode)); 1410 } 1411 if (data >= 0) { 1412 reply(125, "Using existing data connection for '%s'%s.", 1413 name, sizebuf); 1414 usedefault = 1; 1415 return (fdopen(data, mode)); 1416 } 1417 if (usedefault) 1418 data_dest = his_addr; 1419 usedefault = 1; 1420 file = getdatasock(mode); 1421 if (file == NULL) { 1422 char hbuf[INET6_ADDRSTRLEN]; 1423 char pbuf[10]; 1424 getnameinfo((struct sockaddr *)&data_source, data_source.su_len, 1425 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1426 NI_NUMERICHOST | NI_NUMERICSERV); 1427 reply(425, "Can't create data socket (%s,%s): %s.", 1428 hbuf, pbuf, strerror(errno)); 1429 return (NULL); 1430 } 1431 data = fileno(file); 1432 while (connect(data, (struct sockaddr *)&data_dest, 1433 data_dest.su_len) < 0) { 1434 if (errno == EADDRINUSE && retry < swaitmax) { 1435 sleep((unsigned) swaitint); 1436 retry += swaitint; 1437 continue; 1438 } 1439 perror_reply(425, "Can't build data connection"); 1440 (void) fclose(file); 1441 data = -1; 1442 return (NULL); 1443 } 1444 reply(150, "Opening %s mode data connection for '%s'%s.", 1445 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1446 return (file); 1447 } 1448 1449 void 1450 closedataconn(FILE *fd) 1451 { 1452 1453 if (fd != NULL) 1454 (void)fclose(fd); 1455 data = -1; 1456 if (pdata >= 0) 1457 (void)close(pdata); 1458 pdata = -1; 1459 } 1460 1461 /* 1462 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1463 * encapsulation of the data subject * to Mode, Structure, and Type. 1464 * 1465 * NB: Form isn't handled. 1466 */ 1467 static int 1468 send_data(FILE *instr, FILE *outstr, off_t blksize, int isdata) 1469 { 1470 int c, filefd, netfd, rval; 1471 char *buf; 1472 1473 transflag = 1; 1474 rval = -1; 1475 buf = NULL; 1476 if (setjmp(urgcatch)) 1477 goto cleanup_send_data; 1478 1479 switch (type) { 1480 1481 case TYPE_A: 1482 /* XXXX: rate limit ascii send (get) */ 1483 (void) alarm(curclass.timeout); 1484 while ((c = getc(instr)) != EOF) { 1485 byte_count++; 1486 if (c == '\n') { 1487 if (ferror(outstr)) 1488 goto data_err; 1489 (void) putc('\r', outstr); 1490 if (isdata) { 1491 total_data_out++; 1492 total_data++; 1493 } 1494 total_bytes_out++; 1495 total_bytes++; 1496 } 1497 (void) putc(c, outstr); 1498 if (isdata) { 1499 total_data_out++; 1500 total_data++; 1501 } 1502 total_bytes_out++; 1503 total_bytes++; 1504 if ((byte_count % 4096) == 0) 1505 (void) alarm(curclass.timeout); 1506 } 1507 (void) alarm(0); 1508 fflush(outstr); 1509 if (ferror(instr)) 1510 goto file_err; 1511 if (ferror(outstr)) 1512 goto data_err; 1513 rval = 0; 1514 goto cleanup_send_data; 1515 1516 case TYPE_I: 1517 case TYPE_L: 1518 if ((buf = malloc((size_t)blksize)) == NULL) { 1519 perror_reply(451, "Local resource failure: malloc"); 1520 goto cleanup_send_data; 1521 } 1522 filefd = fileno(instr); 1523 netfd = fileno(outstr); 1524 (void) alarm(curclass.timeout); 1525 if (curclass.rateget) { 1526 while (1) { 1527 int d; 1528 struct timeval then, now, td; 1529 off_t bufrem; 1530 char *bufp; 1531 1532 (void)gettimeofday(&then, NULL); 1533 errno = c = d = 0; 1534 bufrem = curclass.rateget; 1535 while (bufrem > 0) { 1536 if ((c = read(filefd, buf, 1537 MIN(blksize, bufrem))) <= 0) 1538 goto senddone; 1539 (void) alarm(curclass.timeout); 1540 bufrem -= c; 1541 byte_count += c; 1542 if (isdata) { 1543 total_data_out += c; 1544 total_data += c; 1545 } 1546 total_bytes_out += c; 1547 total_bytes += c; 1548 for (bufp = buf; c > 0; 1549 c -= d, bufp += d) 1550 if ((d = 1551 write(netfd, bufp, c)) <= 0) 1552 break; 1553 if (d < 0) 1554 goto data_err; 1555 } 1556 (void)gettimeofday(&now, NULL); 1557 timersub(&now, &then, &td); 1558 if (td.tv_sec == 0) 1559 usleep(1000000 - td.tv_usec); 1560 } 1561 } else { 1562 while ((c = read(filefd, buf, (size_t)blksize)) > 0) { 1563 if (write(netfd, buf, c) != c) 1564 goto data_err; 1565 (void) alarm(curclass.timeout); 1566 byte_count += c; 1567 if (isdata) { 1568 total_data_out += c; 1569 total_data += c; 1570 } 1571 total_bytes_out += c; 1572 total_bytes += c; 1573 } 1574 } 1575 senddone: 1576 if (c < 0) 1577 goto file_err; 1578 rval = 0; 1579 goto cleanup_send_data; 1580 1581 default: 1582 reply(550, "Unimplemented TYPE %d in send_data", type); 1583 goto cleanup_send_data; 1584 } 1585 1586 data_err: 1587 (void) alarm(0); 1588 perror_reply(426, "Data connection"); 1589 goto cleanup_send_data; 1590 1591 file_err: 1592 (void) alarm(0); 1593 perror_reply(551, "Error on input file"); 1594 /* FALLTHROUGH */ 1595 1596 cleanup_send_data: 1597 (void) alarm(0); 1598 transflag = 0; 1599 if (buf) 1600 free(buf); 1601 if (isdata) { 1602 total_files_out++; 1603 total_files++; 1604 } 1605 total_xfers_out++; 1606 total_xfers++; 1607 return (rval); 1608 } 1609 1610 /* 1611 * Transfer data from peer to "outstr" using the appropriate encapulation of 1612 * the data subject to Mode, Structure, and Type. 1613 * 1614 * N.B.: Form isn't handled. 1615 */ 1616 static int 1617 receive_data(FILE *instr, FILE *outstr) 1618 { 1619 int c, bare_lfs, netfd, filefd, rval; 1620 char buf[BUFSIZ]; 1621 #ifdef __GNUC__ 1622 (void) &bare_lfs; 1623 #endif 1624 1625 bare_lfs = 0; 1626 transflag = 1; 1627 rval = -1; 1628 if (setjmp(urgcatch)) 1629 goto cleanup_recv_data; 1630 1631 switch (type) { 1632 1633 case TYPE_I: 1634 case TYPE_L: 1635 netfd = fileno(instr); 1636 filefd = fileno(outstr); 1637 (void) alarm(curclass.timeout); 1638 if (curclass.rateput) { 1639 while (1) { 1640 int d; 1641 struct timeval then, now, td; 1642 off_t bufrem; 1643 1644 (void)gettimeofday(&then, NULL); 1645 errno = c = d = 0; 1646 for (bufrem = curclass.rateput; bufrem > 0; ) { 1647 if ((c = read(netfd, buf, 1648 MIN(sizeof(buf), bufrem))) <= 0) 1649 goto recvdone; 1650 if ((d = write(filefd, buf, c)) != c) 1651 goto recvdone; 1652 (void) alarm(curclass.timeout); 1653 bufrem -= c; 1654 byte_count += c; 1655 total_data_in += c; 1656 total_data += c; 1657 total_bytes_in += c; 1658 total_bytes += c; 1659 } 1660 (void)gettimeofday(&now, NULL); 1661 timersub(&now, &then, &td); 1662 if (td.tv_sec == 0) 1663 usleep(1000000 - td.tv_usec); 1664 } 1665 } else { 1666 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1667 if (write(filefd, buf, c) != c) 1668 goto file_err; 1669 (void) alarm(curclass.timeout); 1670 byte_count += c; 1671 total_data_in += c; 1672 total_data += c; 1673 total_bytes_in += c; 1674 total_bytes += c; 1675 } 1676 } 1677 recvdone: 1678 if (c < 0) 1679 goto data_err; 1680 rval = 0; 1681 goto cleanup_recv_data; 1682 1683 case TYPE_E: 1684 reply(553, "TYPE E not implemented."); 1685 goto cleanup_recv_data; 1686 1687 case TYPE_A: 1688 (void) alarm(curclass.timeout); 1689 /* XXXX: rate limit ascii receive (put) */ 1690 while ((c = getc(instr)) != EOF) { 1691 byte_count++; 1692 total_data_in++; 1693 total_data++; 1694 total_bytes_in++; 1695 total_bytes++; 1696 if ((byte_count % 4096) == 0) 1697 (void) alarm(curclass.timeout); 1698 if (c == '\n') 1699 bare_lfs++; 1700 while (c == '\r') { 1701 if (ferror(outstr)) 1702 goto data_err; 1703 if ((c = getc(instr)) != '\n') { 1704 byte_count++; 1705 total_data_in++; 1706 total_data++; 1707 total_bytes_in++; 1708 total_bytes++; 1709 if ((byte_count % 4096) == 0) 1710 (void) alarm(curclass.timeout); 1711 (void) putc ('\r', outstr); 1712 if (c == '\0' || c == EOF) 1713 goto contin2; 1714 } 1715 } 1716 (void) putc(c, outstr); 1717 contin2: ; 1718 } 1719 (void) alarm(0); 1720 fflush(outstr); 1721 if (ferror(instr)) 1722 goto data_err; 1723 if (ferror(outstr)) 1724 goto file_err; 1725 if (bare_lfs) { 1726 reply(-226, 1727 "WARNING! %d bare linefeeds received in ASCII mode", 1728 bare_lfs); 1729 reply(0, "File may not have transferred correctly."); 1730 } 1731 rval = 0; 1732 goto cleanup_recv_data; 1733 1734 default: 1735 reply(550, "Unimplemented TYPE %d in receive_data", type); 1736 goto cleanup_recv_data; 1737 } 1738 1739 data_err: 1740 (void) alarm(0); 1741 perror_reply(426, "Data Connection"); 1742 goto cleanup_recv_data; 1743 1744 file_err: 1745 (void) alarm(0); 1746 perror_reply(452, "Error writing file"); 1747 goto cleanup_recv_data; 1748 1749 cleanup_recv_data: 1750 (void) alarm(0); 1751 transflag = 0; 1752 total_files_in++; 1753 total_files++; 1754 total_xfers_in++; 1755 total_xfers++; 1756 return (rval); 1757 } 1758 1759 void 1760 statcmd(void) 1761 { 1762 union sockunion *su = NULL; 1763 static char ntop_buf[INET6_ADDRSTRLEN]; 1764 u_char *a, *p; 1765 int ispassive, af; 1766 off_t otbi, otbo, otb; 1767 1768 a = p = (u_char *)NULL; 1769 1770 reply(-211, "%s FTP server status:", hostname); 1771 reply(0, "Version: %s", EMPTYSTR(version) ? "<suppressed>" : version); 1772 ntop_buf[0] = '\0'; 1773 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1774 ntop_buf, sizeof(ntop_buf), NULL, 0, NI_NUMERICHOST) 1775 && strcmp(remotehost, ntop_buf) != 0) { 1776 reply(0, "Connected to %s (%s)", remotehost, ntop_buf); 1777 } else 1778 reply(0, "Connected to %s", remotehost); 1779 if (logged_in) { 1780 if (curclass.type == CLASS_GUEST) 1781 reply(0, "Logged in anonymously"); 1782 else 1783 reply(0, "Logged in as %s%s", pw->pw_name, 1784 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 1785 } else if (askpasswd) 1786 reply(0, "Waiting for password"); 1787 else 1788 reply(0, "Waiting for user name"); 1789 cprintf(stdout, " TYPE: %s", typenames[type]); 1790 if (type == TYPE_A || type == TYPE_E) 1791 cprintf(stdout, ", FORM: %s", formnames[form]); 1792 if (type == TYPE_L) { 1793 #if NBBY == 8 1794 cprintf(stdout, " %d", NBBY); 1795 #else 1796 /* XXX: `bytesize' needs to be defined in this case */ 1797 cprintf(stdout, " %d", bytesize); 1798 #endif 1799 } 1800 cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n", 1801 strunames[stru], modenames[mode]); 1802 ispassive = 0; 1803 if (data != -1) { 1804 reply(0, "Data connection open"); 1805 su = NULL; 1806 } else if (pdata != -1) { 1807 reply(0, "in Passive mode"); 1808 su = (union sockunion *)&pasv_addr; 1809 ispassive = 1; 1810 goto printaddr; 1811 } else if (usedefault == 0) { 1812 if (epsvall) { 1813 reply(0, "EPSV only mode (EPSV ALL)"); 1814 goto epsvonly; 1815 } 1816 su = (union sockunion *)&data_dest; 1817 printaddr: 1818 /* PASV/PORT */ 1819 if (su->su_family == AF_INET) { 1820 a = (u_char *) &su->su_sin.sin_addr; 1821 p = (u_char *) &su->su_sin.sin_port; 1822 #define UC(b) (((int) b) & 0xff) 1823 reply(0, "%s (%d,%d,%d,%d,%d,%d)", 1824 ispassive ? "PASV" : "PORT" , 1825 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1826 UC(p[0]), UC(p[1])); 1827 } 1828 1829 /* LPSV/LPRT */ 1830 { 1831 int alen, af, i; 1832 1833 alen = 0; 1834 switch (su->su_family) { 1835 case AF_INET: 1836 a = (u_char *) &su->su_sin.sin_addr; 1837 p = (u_char *) &su->su_sin.sin_port; 1838 alen = sizeof(su->su_sin.sin_addr); 1839 af = 4; 1840 break; 1841 case AF_INET6: 1842 a = (u_char *) &su->su_sin6.sin6_addr; 1843 p = (u_char *) &su->su_sin6.sin6_port; 1844 alen = sizeof(su->su_sin6.sin6_addr); 1845 af = 6; 1846 break; 1847 default: 1848 af = 0; 1849 break; 1850 } 1851 if (af) { 1852 cprintf(stdout, " %s (%d,%d", 1853 ispassive ? "LPSV" : "LPRT", af, alen); 1854 for (i = 0; i < alen; i++) 1855 cprintf(stdout, ",%d", UC(a[i])); 1856 cprintf(stdout, ",%d,%d,%d)", 2, UC(p[0]), UC(p[1])); 1857 #undef UC 1858 } 1859 } 1860 1861 /* EPRT/EPSV */ 1862 epsvonly: 1863 switch (su->su_family) { 1864 case AF_INET: 1865 af = 1; 1866 break; 1867 case AF_INET6: 1868 af = 2; 1869 break; 1870 default: 1871 af = 0; 1872 break; 1873 } 1874 if (af) { 1875 if (getnameinfo((struct sockaddr *)su, su->su_len, 1876 ntop_buf, sizeof(ntop_buf), NULL, 0, 1877 NI_NUMERICHOST) == 0) { 1878 reply(0, "%s (|%d|%s|%d|)", 1879 ispassive ? "EPSV" : "EPRT", 1880 af, ntop_buf, ntohs(su->su_port)); 1881 } 1882 } 1883 } else 1884 reply(0, "No data connection"); 1885 1886 if (logged_in) { 1887 reply(0, "Data sent: %qd byte%s in %qd file%s", 1888 (qdfmt_t)total_data_out, PLURAL(total_data_out), 1889 (qdfmt_t)total_files_out, PLURAL(total_files_out)); 1890 reply(0, "Data received: %qd byte%s in %qd file%s", 1891 (qdfmt_t)total_data_in, PLURAL(total_data_in), 1892 (qdfmt_t)total_files_in, PLURAL(total_files_in)); 1893 reply(0, "Total data: %qd byte%s in %qd file%s", 1894 (qdfmt_t)total_data, PLURAL(total_data), 1895 (qdfmt_t)total_files, PLURAL(total_files)); 1896 } 1897 otbi = total_bytes_in; 1898 otbo = total_bytes_out; 1899 otb = total_bytes; 1900 reply(0, "Traffic sent: %qd byte%s in %qd transfer%s", 1901 (qdfmt_t)otbo, PLURAL(otbo), 1902 (qdfmt_t)total_xfers_out, PLURAL(total_xfers_out)); 1903 reply(0, "Traffic received: %qd byte%s in %qd transfer%s", 1904 (qdfmt_t)otbi, PLURAL(otbi), 1905 (qdfmt_t)total_xfers_in, PLURAL(total_xfers_in)); 1906 reply(0, "Total traffic: %qd byte%s in %qd transfer%s", 1907 (qdfmt_t)otb, PLURAL(otb), 1908 (qdfmt_t)total_xfers, PLURAL(total_xfers)); 1909 1910 if (logged_in) { 1911 struct ftpconv *cp; 1912 1913 reply(0, "%s", ""); 1914 reply(0, "Class: %s, type: %s", 1915 curclass.classname, CURCLASSTYPE); 1916 reply(0, "Check PORT/LPRT commands: %sabled", 1917 curclass.checkportcmd ? "en" : "dis"); 1918 if (! EMPTYSTR(curclass.display)) 1919 reply(0, "Display file: %s", curclass.display); 1920 if (! EMPTYSTR(curclass.notify)) 1921 reply(0, "Notify fileglob: %s", curclass.notify); 1922 reply(0, "Idle timeout: %d, maximum timeout: %d", 1923 curclass.timeout, curclass.maxtimeout); 1924 reply(0, "Current connections: %d", connections); 1925 if (curclass.limit == -1) 1926 reply(0, "Maximum connections: unlimited"); 1927 else 1928 reply(0, "Maximum connections: %d", curclass.limit); 1929 if (curclass.limitfile) 1930 reply(0, "Connection limit exceeded file: %s", 1931 curclass.limitfile); 1932 if (! EMPTYSTR(curclass.chroot)) 1933 reply(0, "Chroot format: %s", curclass.chroot); 1934 if (! EMPTYSTR(curclass.homedir)) 1935 reply(0, "Homedir format: %s", curclass.homedir); 1936 if (! EMPTYSTR(curclass.motd)) 1937 reply(0, "MotD file: %s", curclass.motd); 1938 reply(0, 1939 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 1940 curclass.modify ? "en" : "dis"); 1941 reply(0, "Upload commands (APPE, STOR, STOU): %sabled", 1942 curclass.upload ? "en" : "dis"); 1943 if (curclass.portmin && curclass.portmax) 1944 reply(0, "PASV port range: %d - %d", 1945 curclass.portmin, curclass.portmax); 1946 if (curclass.rateget) 1947 reply(0, "Rate get limit: %d bytes/sec", 1948 curclass.rateget); 1949 else 1950 reply(0, "Rate get limit: disabled"); 1951 if (curclass.rateput) 1952 reply(0, "Rate put limit: %d bytes/sec", 1953 curclass.rateput); 1954 else 1955 reply(0, "Rate put limit: disabled"); 1956 reply(0, "Umask: %.04o", curclass.umask); 1957 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1958 if (cp->suffix == NULL || cp->types == NULL || 1959 cp->command == NULL) 1960 continue; 1961 reply(0, "Conversion: %s [%s] disable: %s, command: %s", 1962 cp->suffix, cp->types, cp->disable, cp->command); 1963 } 1964 } 1965 1966 reply(211, "End of status"); 1967 } 1968 1969 void 1970 fatal(const char *s) 1971 { 1972 1973 reply(451, "Error in server: %s\n", s); 1974 reply(221, "Closing connection due to server error."); 1975 dologout(0); 1976 /* NOTREACHED */ 1977 } 1978 1979 /* 1980 * reply() -- 1981 * depending on the value of n, display fmt with a trailing CRLF and 1982 * prefix of: 1983 * n < -1 prefix the message with abs(n) + "-" (initial line) 1984 * n == 0 prefix the message with 4 spaces (middle lines) 1985 * n > 0 prefix the message with n + " " (final line) 1986 */ 1987 void 1988 reply(int n, const char *fmt, ...) 1989 { 1990 off_t b; 1991 va_list ap; 1992 1993 va_start(ap, fmt); 1994 b = 0; 1995 if (n == 0) 1996 cprintf(stdout, " "); 1997 else if (n < 0) 1998 cprintf(stdout, "%d-", -n); 1999 else 2000 cprintf(stdout, "%d ", n); 2001 b = vprintf(fmt, ap); 2002 total_bytes += b; 2003 total_bytes_out += b; 2004 cprintf(stdout, "\r\n"); 2005 (void)fflush(stdout); 2006 if (debug) { 2007 syslog(LOG_DEBUG, "<--- %d%c", abs(n), (n < 0) ? '-' : ' '); 2008 vsyslog(LOG_DEBUG, fmt, ap); 2009 } 2010 } 2011 2012 static void 2013 dolog(struct sockaddr *who) 2014 { 2015 getnameinfo(who, who->sa_len, remotehost, sizeof(remotehost), NULL,0,0); 2016 #ifdef HASSETPROCTITLE 2017 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2018 setproctitle("%s", proctitle); 2019 #endif /* HASSETPROCTITLE */ 2020 if (logging) 2021 syslog(LOG_INFO, "connection from %s to %s", 2022 remotehost, hostname); 2023 } 2024 2025 /* 2026 * Record logout in wtmp file 2027 * and exit with supplied status. 2028 */ 2029 void 2030 dologout(int status) 2031 { 2032 /* 2033 * Prevent reception of SIGURG from resulting in a resumption 2034 * back to the main program loop. 2035 */ 2036 transflag = 0; 2037 2038 if (logged_in) { 2039 logwtmp(ttyline, "", ""); 2040 if (doutmp) 2041 logout(utmp.ut_line); 2042 #ifdef KERBEROS 2043 if (!notickets && krbtkfile_env) 2044 unlink(krbtkfile_env); 2045 #endif 2046 } 2047 /* beware of flushing buffers after a SIGPIPE */ 2048 _exit(status); 2049 } 2050 2051 static void 2052 myoob(int signo) 2053 { 2054 char *cp; 2055 2056 /* only process if transfer occurring */ 2057 if (!transflag) 2058 return; 2059 cp = tmpline; 2060 if (getline(cp, 7, stdin) == NULL) { 2061 reply(221, "You could at least say goodbye."); 2062 dologout(0); 2063 } 2064 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2065 tmpline[0] = '\0'; 2066 reply(426, "Transfer aborted. Data connection closed."); 2067 reply(226, "Abort successful"); 2068 longjmp(urgcatch, 1); 2069 } 2070 if (strcasecmp(cp, "STAT\r\n") == 0) { 2071 tmpline[0] = '\0'; 2072 if (file_size != (off_t) -1) 2073 reply(213, "Status: %qd of %qd byte%s transferred", 2074 (qdfmt_t)byte_count, (qdfmt_t)file_size, 2075 PLURAL(byte_count)); 2076 else 2077 reply(213, "Status: %qd byte%s transferred", 2078 (qdfmt_t)byte_count, PLURAL(byte_count)); 2079 } 2080 } 2081 2082 static int 2083 bind_pasv_addr(void) 2084 { 2085 static int passiveport; 2086 int port, len; 2087 2088 len = pasv_addr.su_len; 2089 if (curclass.portmin == 0 && curclass.portmax == 0) { 2090 pasv_addr.su_port = 0; 2091 return (bind(pdata, (struct sockaddr *)&pasv_addr, len)); 2092 } 2093 2094 if (passiveport == 0) { 2095 srand(getpid()); 2096 passiveport = rand() % (curclass.portmax - curclass.portmin) 2097 + curclass.portmin; 2098 } 2099 2100 port = passiveport; 2101 while (1) { 2102 port++; 2103 if (port > curclass.portmax) 2104 port = curclass.portmin; 2105 else if (port == passiveport) { 2106 errno = EAGAIN; 2107 return (-1); 2108 } 2109 pasv_addr.su_port = htons(port); 2110 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) == 0) 2111 break; 2112 if (errno != EADDRINUSE) 2113 return (-1); 2114 } 2115 passiveport = port; 2116 return (0); 2117 } 2118 2119 /* 2120 * Note: a response of 425 is not mentioned as a possible response to 2121 * the PASV command in RFC959. However, it has been blessed as 2122 * a legitimate response by Jon Postel in a telephone conversation 2123 * with Rick Adams on 25 Jan 89. 2124 */ 2125 void 2126 passive(void) 2127 { 2128 int len; 2129 char *p, *a; 2130 2131 if (pdata >= 0) 2132 close(pdata); 2133 pdata = socket(AF_INET, SOCK_STREAM, 0); 2134 if (pdata < 0 || !logged_in) { 2135 perror_reply(425, "Can't open passive connection"); 2136 return; 2137 } 2138 pasv_addr = ctrl_addr; 2139 2140 if (bind_pasv_addr() < 0) 2141 goto pasv_error; 2142 len = pasv_addr.su_len; 2143 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2144 goto pasv_error; 2145 if (listen(pdata, 1) < 0) 2146 goto pasv_error; 2147 a = (char *) &pasv_addr.su_sin.sin_addr; 2148 p = (char *) &pasv_addr.su_port; 2149 2150 #define UC(b) (((int) b) & 0xff) 2151 2152 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2153 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2154 return; 2155 2156 pasv_error: 2157 (void) close(pdata); 2158 pdata = -1; 2159 perror_reply(425, "Can't open passive connection"); 2160 return; 2161 } 2162 2163 /* 2164 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2165 * 229 Entering Extended Passive Mode (|||port|) 2166 */ 2167 void 2168 long_passive(char *cmd, int pf) 2169 { 2170 int len; 2171 char *p, *a; 2172 2173 if (!logged_in) { 2174 syslog(LOG_NOTICE, "long passive but not logged in"); 2175 reply(503, "Login with USER first."); 2176 return; 2177 } 2178 2179 if (pf != PF_UNSPEC) { 2180 if (ctrl_addr.su_family != pf) { 2181 switch (ctrl_addr.su_family) { 2182 case AF_INET: 2183 pf = 1; 2184 break; 2185 case AF_INET6: 2186 pf = 2; 2187 break; 2188 default: 2189 pf = 0; 2190 break; 2191 } 2192 /* 2193 * XXX 2194 * only EPRT/EPSV ready clients will understand this 2195 */ 2196 if (strcmp(cmd, "EPSV") == 0 && pf) { 2197 reply(522, "Network protocol mismatch, " 2198 "use (%d)", pf); 2199 } else 2200 reply(501, "Network protocol mismatch"); /*XXX*/ 2201 2202 return; 2203 } 2204 } 2205 2206 if (pdata >= 0) 2207 close(pdata); 2208 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2209 if (pdata < 0) { 2210 perror_reply(425, "Can't open passive connection"); 2211 return; 2212 } 2213 pasv_addr = ctrl_addr; 2214 if (bind_pasv_addr() < 0) 2215 goto pasv_error; 2216 len = pasv_addr.su_len; 2217 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2218 goto pasv_error; 2219 if (listen(pdata, 1) < 0) 2220 goto pasv_error; 2221 p = (char *) &pasv_addr.su_port; 2222 2223 #define UC(b) (((int) b) & 0xff) 2224 2225 if (strcmp(cmd, "LPSV") == 0) { 2226 switch (pasv_addr.su_family) { 2227 case AF_INET: 2228 a = (char *) &pasv_addr.su_sin.sin_addr; 2229 reply(228, "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2230 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2231 2, UC(p[0]), UC(p[1])); 2232 return; 2233 case AF_INET6: 2234 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2235 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)", 2236 6, 16, 2237 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2238 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2239 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2240 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2241 2, UC(p[0]), UC(p[1])); 2242 return; 2243 } 2244 #undef UC 2245 } else if (strcmp(cmd, "EPSV") == 0) { 2246 switch (pasv_addr.su_family) { 2247 case AF_INET: 2248 case AF_INET6: 2249 reply(229, "Entering Extended Passive Mode (|||%d|)", 2250 ntohs(pasv_addr.su_port)); 2251 return; 2252 } 2253 } else { 2254 /* more proper error code? */ 2255 } 2256 2257 pasv_error: 2258 (void) close(pdata); 2259 pdata = -1; 2260 perror_reply(425, "Can't open passive connection"); 2261 return; 2262 } 2263 2264 /* 2265 * Generate unique name for file with basename "local". 2266 * The file named "local" is already known to exist. 2267 * Generates failure reply on error. 2268 * 2269 * XXX this function should under go changes similar to 2270 * the mktemp(3)/mkstemp(3) changes. 2271 */ 2272 static char * 2273 gunique(const char *local) 2274 { 2275 static char new[MAXPATHLEN]; 2276 struct stat st; 2277 char *cp; 2278 int count; 2279 2280 cp = strrchr(local, '/'); 2281 if (cp) 2282 *cp = '\0'; 2283 if (stat(cp ? local : ".", &st) < 0) { 2284 perror_reply(553, cp ? local : "."); 2285 return (NULL); 2286 } 2287 if (cp) 2288 *cp = '/'; 2289 for (count = 1; count < 100; count++) { 2290 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2291 if (stat(new, &st) < 0) 2292 return (new); 2293 } 2294 reply(452, "Unique file name cannot be created."); 2295 return (NULL); 2296 } 2297 2298 /* 2299 * Format and send reply containing system error number. 2300 */ 2301 void 2302 perror_reply(int code, const char *string) 2303 { 2304 int save_errno; 2305 2306 save_errno = errno; 2307 reply(code, "%s: %s.", string, strerror(errno)); 2308 errno = save_errno; 2309 } 2310 2311 static char *onefile[] = { 2312 "", 2313 0 2314 }; 2315 2316 void 2317 send_file_list(const char *whichf) 2318 { 2319 struct stat st; 2320 DIR *dirp = NULL; 2321 struct dirent *dir; 2322 FILE *dout = NULL; 2323 char **dirlist, *dirname, *p; 2324 int simple = 0; 2325 int freeglob = 0; 2326 glob_t gl; 2327 off_t b; 2328 2329 #ifdef __GNUC__ 2330 (void) &dout; 2331 (void) &dirlist; 2332 (void) &simple; 2333 (void) &freeglob; 2334 #endif 2335 2336 p = NULL; 2337 if (strpbrk(whichf, "~{[*?") != NULL) { 2338 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2339 2340 memset(&gl, 0, sizeof(gl)); 2341 freeglob = 1; 2342 if (glob(whichf, flags, 0, &gl)) { 2343 reply(550, "not found"); 2344 goto out; 2345 } else if (gl.gl_pathc == 0) { 2346 errno = ENOENT; 2347 perror_reply(550, whichf); 2348 goto out; 2349 } 2350 dirlist = gl.gl_pathv; 2351 } else { 2352 p = xstrdup(whichf); 2353 onefile[0] = p; 2354 dirlist = onefile; 2355 simple = 1; 2356 } 2357 /* XXX: } for vi sm */ 2358 2359 if (setjmp(urgcatch)) { 2360 transflag = 0; 2361 goto out; 2362 } 2363 while ((dirname = *dirlist++) != NULL) { 2364 int trailingslash = 0; 2365 2366 if (stat(dirname, &st) < 0) { 2367 /* 2368 * If user typed "ls -l", etc, and the client 2369 * used NLST, do what the user meant. 2370 */ 2371 /* XXX: nuke this support? */ 2372 if (dirname[0] == '-' && *dirlist == NULL && 2373 transflag == 0) { 2374 char *argv[] = { INTERNAL_LS, "", NULL }; 2375 2376 argv[1] = dirname; 2377 retrieve(argv, dirname); 2378 goto out; 2379 } 2380 perror_reply(550, whichf); 2381 goto cleanup_send_file_list; 2382 } 2383 2384 if (S_ISREG(st.st_mode)) { 2385 if (dout == NULL) { 2386 dout = dataconn("file list", (off_t)-1, "w"); 2387 if (dout == NULL) 2388 goto out; 2389 transflag++; 2390 } 2391 b = fprintf(dout, "%s%s\n", dirname, 2392 type == TYPE_A ? "\r" : ""); 2393 total_bytes += b; 2394 total_bytes_out += b; 2395 byte_count += strlen(dirname) + 1; 2396 continue; 2397 } else if (!S_ISDIR(st.st_mode)) 2398 continue; 2399 2400 if (dirname[strlen(dirname) - 1] == '/') 2401 trailingslash++; 2402 2403 if ((dirp = opendir(dirname)) == NULL) 2404 continue; 2405 2406 while ((dir = readdir(dirp)) != NULL) { 2407 char nbuf[MAXPATHLEN]; 2408 2409 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 2410 continue; 2411 2412 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2413 trailingslash ? "" : "/", dir->d_name); 2414 2415 /* 2416 * We have to do a stat to ensure it's 2417 * not a directory or special file. 2418 */ 2419 /* XXX: follow RFC959 and filter out non files ? */ 2420 if (simple || (stat(nbuf, &st) == 0 && 2421 S_ISREG(st.st_mode))) { 2422 char *p; 2423 2424 if (dout == NULL) { 2425 dout = dataconn("file list", (off_t)-1, 2426 "w"); 2427 if (dout == NULL) 2428 goto out; 2429 transflag++; 2430 } 2431 p = nbuf; 2432 if (nbuf[0] == '.' && nbuf[1] == '/') 2433 p = &nbuf[2]; 2434 b = fprintf(dout, "%s%s\n", p, 2435 type == TYPE_A ? "\r" : ""); 2436 total_bytes += b; 2437 total_bytes_out += b; 2438 byte_count += strlen(nbuf) + 1; 2439 } 2440 } 2441 (void) closedir(dirp); 2442 } 2443 2444 if (dout == NULL) 2445 reply(550, "No files found."); 2446 else if (ferror(dout) != 0) 2447 perror_reply(550, "Data connection"); 2448 else 2449 reply(226, "Transfer complete."); 2450 2451 cleanup_send_file_list: 2452 transflag = 0; 2453 closedataconn(dout); 2454 out: 2455 total_xfers++; 2456 total_xfers_out++; 2457 if (p) 2458 free(p); 2459 if (freeglob) 2460 globfree(&gl); 2461 } 2462 2463 char * 2464 conffilename(const char *s) 2465 { 2466 static char filename[MAXPATHLEN]; 2467 2468 if (*s == '/') 2469 strlcpy(filename, s, sizeof(filename)); 2470 else 2471 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2472 return (filename); 2473 } 2474 2475 /* 2476 * logcmd -- 2477 * based on the arguments, syslog a message: 2478 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2479 * else if file2 != NULL "<command> <file1> <file2>" 2480 * else "<command> <file1>" 2481 * if elapsed != NULL, append "in xxx.yyy seconds" 2482 * if error != NULL, append ": " + error 2483 */ 2484 void 2485 logcmd(const char *command, off_t bytes, const char *file1, const char *file2, 2486 const struct timeval *elapsed, const char *error) 2487 { 2488 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN]; 2489 const char *p; 2490 size_t len; 2491 2492 if (logging <=1) 2493 return; 2494 2495 if ((p = realpath(file1, realfile)) == NULL) { 2496 #if 0 /* XXX: too noisy */ 2497 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2498 realfile, strerror(errno)); 2499 #endif 2500 p = file1; 2501 } 2502 len = snprintf(buf, sizeof(buf), "%s %s", command, p); 2503 2504 if (bytes != (off_t)-1) { 2505 len += snprintf(buf + len, sizeof(buf) - len, 2506 " = %qd byte%s", (qdfmt_t) bytes, PLURAL(bytes)); 2507 } else if (file2 != NULL) { 2508 if ((p = realpath(file2, realfile)) == NULL) { 2509 #if 0 /* XXX: too noisy */ 2510 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2511 realfile, strerror(errno)); 2512 #endif 2513 p = file2; 2514 } 2515 len += snprintf(buf + len, sizeof(buf) - len, " %s", p); 2516 } 2517 2518 if (elapsed != NULL) { 2519 len += snprintf(buf + len, sizeof(buf) - len, 2520 " in %ld.%.03d seconds", elapsed->tv_sec, 2521 (int)(elapsed->tv_usec / 1000)); 2522 } 2523 2524 if (error != NULL) 2525 len += snprintf(buf + len, sizeof(buf) - len, ": %s", error); 2526 2527 syslog(LOG_INFO, "%s", buf); 2528 } 2529 2530 char * 2531 xstrdup(const char *s) 2532 { 2533 char *new = strdup(s); 2534 2535 if (new == NULL) 2536 fatal("Local resource failure: malloc"); 2537 /* NOTREACHED */ 2538 return (new); 2539 } 2540 2541 /* 2542 * As per fprintf(), but increment total_bytes and total_bytes_out, 2543 * by the appropriate amount. 2544 */ 2545 void 2546 cprintf(FILE *fd, const char *fmt, ...) 2547 { 2548 off_t b; 2549 va_list ap; 2550 2551 va_start(ap, fmt); 2552 b = vfprintf(fd, fmt, ap); 2553 total_bytes += b; 2554 total_bytes_out += b; 2555 } 2556
Indexes created Wed Sep 24 22:09:59 GMT 2025