ftpd.c revision 1.104
1 /* $NetBSD: ftpd.c,v 1.104 2000/09/15 14:55:16 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Luke Mewburn. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 41 * The Regents of the University of California. All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 */ 71 72 /* 73 * Copyright (C) 1997 and 1998 WIDE Project. 74 * All rights reserved. 75 * 76 * Redistribution and use in source and binary forms, with or without 77 * modification, are permitted provided that the following conditions 78 * are met: 79 * 1. Redistributions of source code must retain the above copyright 80 * notice, this list of conditions and the following disclaimer. 81 * 2. Redistributions in binary form must reproduce the above copyright 82 * notice, this list of conditions and the following disclaimer in the 83 * documentation and/or other materials provided with the distribution. 84 * 3. Neither the name of the project nor the names of its contributors 85 * may be used to endorse or promote products derived from this software 86 * without specific prior written permission. 87 * 88 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 89 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 90 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 91 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 92 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 93 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 94 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 95 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 96 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 97 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 98 * SUCH DAMAGE. 99 */ 100 101 #include <sys/cdefs.h> 102 #ifndef lint 103 __COPYRIGHT( 104 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 105 The Regents of the University of California. All rights reserved.\n"); 106 #endif /* not lint */ 107 108 #ifndef lint 109 #if 0 110 static char sccsid[] = "@(#)ftpd.c 8.5 (Berkeley) 4/28/95"; 111 #else 112 __RCSID("$NetBSD: ftpd.c,v 1.104 2000/09/15 14:55:16 christos Exp $"); 113 #endif 114 #endif /* not lint */ 115 116 /* 117 * FTP server. 118 */ 119 #include <sys/param.h> 120 #include <sys/stat.h> 121 #include <sys/ioctl.h> 122 #include <sys/socket.h> 123 #include <sys/wait.h> 124 125 #include <netinet/in.h> 126 #include <netinet/in_systm.h> 127 #include <netinet/ip.h> 128 129 #define FTP_NAMES 130 #include <arpa/ftp.h> 131 #include <arpa/inet.h> 132 #include <arpa/telnet.h> 133 134 #include <ctype.h> 135 #include <dirent.h> 136 #include <err.h> 137 #include <errno.h> 138 #include <fcntl.h> 139 #include <fnmatch.h> 140 #include <glob.h> 141 #include <grp.h> 142 #include <limits.h> 143 #include <netdb.h> 144 #include <pwd.h> 145 #include <setjmp.h> 146 #include <signal.h> 147 #include <stdarg.h> 148 #include <stdio.h> 149 #include <stdlib.h> 150 #include <string.h> 151 #include <syslog.h> 152 #include <time.h> 153 #include <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 #ifndef INET6_ADDRSTRLEN 196 #define INET6_ADDRSTRLEN MAXHOSTNAMELEN 197 #endif 198 199 int epsvall = 0; 200 201 /* 202 * Timeout intervals for retrying connections 203 * to hosts that don't accept PORT cmds. This 204 * is a kludge, but given the problems with TCP... 205 */ 206 #define SWAITMAX 90 /* wait at most 90 seconds */ 207 #define SWAITINT 5 /* interval between retries */ 208 209 int swaitmax = SWAITMAX; 210 int swaitint = SWAITINT; 211 212 static int bind_pasv_addr(void); 213 static int checkuser(const char *, const char *, int, int, char **); 214 static int checkaccess(const char *); 215 static void dolog(struct sockaddr *); 216 static void end_login(void); 217 static FILE *getdatasock(const char *); 218 static char *gunique(const char *); 219 static void lostconn(int); 220 static void myoob(int); 221 static int receive_data(FILE *, FILE *); 222 static int send_data(FILE *, FILE *, off_t, int); 223 static struct passwd *sgetpwnam(const char *); 224 225 int main(int, char *[]); 226 227 #if defined(KERBEROS) 228 int klogin(struct passwd *, char *, char *, char *); 229 void kdestroy(void); 230 #endif 231 #if defined(KERBEROS5) 232 int k5login(struct passwd *, char *, char *, char *); 233 void k5destroy(void); 234 #endif 235 236 int 237 main(int argc, char *argv[]) 238 { 239 int addrlen, ch, on = 1, tos, keepalive; 240 #ifdef KERBEROS5 241 krb5_error_code kerror; 242 #endif 243 244 connections = 1; 245 debug = 0; 246 logging = 0; 247 pdata = -1; 248 sflag = 0; 249 doutmp = 0; /* default: don't log to utmp */ 250 dowtmp = 1; /* default: DO log to wtmp */ 251 dropprivs = 0; 252 mapped = 0; 253 usedefault = 1; 254 (void)strcpy(confdir, _DEFAULT_CONFDIR); 255 hostname[0] = '\0'; 256 homedir[0] = '\0'; 257 gidcount = 0; 258 259 version = FTPD_VERSION; 260 while ((ch = getopt(argc, argv, "a:c:C:dh:Hlrst:T:u:UvV:W")) != -1) { 261 switch (ch) { 262 case 'a': 263 anondir = optarg; 264 break; 265 266 case 'c': 267 (void)strlcpy(confdir, optarg, sizeof(confdir)); 268 break; 269 270 case 'C': 271 pw = sgetpwnam(optarg); 272 exit(checkaccess(optarg) ? 0 : 1); 273 /* NOTREACHED */ 274 275 case 'd': 276 case 'v': /* deprecated */ 277 debug = 1; 278 break; 279 280 case 'h': 281 strlcpy(hostname, optarg, sizeof(hostname)); 282 break; 283 284 case 'H': 285 if (gethostname(hostname, sizeof(hostname)) == -1) 286 hostname[0] = '\0'; 287 hostname[sizeof(hostname) - 1] = '\0'; 288 break; 289 290 case 'l': 291 logging++; /* > 1 == extra logging */ 292 break; 293 294 case 'r': 295 dropprivs = 1; 296 break; 297 298 case 's': 299 sflag = 1; 300 break; 301 302 case 't': 303 case 'T': 304 case 'u': 305 warnx("-%c has been deprecated in favour of ftpd.conf", 306 ch); 307 break; 308 309 case 'U': 310 doutmp = 1; 311 break; 312 313 case 'V': 314 if (EMPTYSTR(optarg) || strcmp(optarg, "-") == 0) 315 version = NULL; 316 else 317 version = xstrdup(optarg); 318 break; 319 320 case 'W': 321 dowtmp = 0; 322 break; 323 324 default: 325 if (optopt == 'a' || optopt == 'C') 326 exit(1); 327 warnx("unknown flag -%c ignored", optopt); 328 break; 329 } 330 } 331 332 /* 333 * LOG_NDELAY sets up the logging connection immediately, 334 * necessary for anonymous ftp's that chroot and can't do it later. 335 */ 336 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 337 addrlen = sizeof(his_addr); /* xxx */ 338 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 339 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 340 exit(1); 341 } 342 addrlen = sizeof(ctrl_addr); 343 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 344 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 345 exit(1); 346 } 347 #ifdef INET6 348 if (his_addr.su_family == AF_INET6 349 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 350 #if 1 351 /* 352 * IPv4 control connection arrived to AF_INET6 socket. 353 * I hate to do this, but this is the easiest solution. 354 * 355 * The assumption is untrue on SIIT environment. 356 */ 357 union sockunion tmp_addr; 358 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 359 360 tmp_addr = his_addr; 361 memset(&his_addr, 0, sizeof(his_addr)); 362 his_addr.su_sin.sin_family = AF_INET; 363 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 364 memcpy(&his_addr.su_sin.sin_addr, 365 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 366 sizeof(his_addr.su_sin.sin_addr)); 367 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 368 369 tmp_addr = ctrl_addr; 370 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 371 ctrl_addr.su_sin.sin_family = AF_INET; 372 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 373 memcpy(&ctrl_addr.su_sin.sin_addr, 374 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 375 sizeof(ctrl_addr.su_sin.sin_addr)); 376 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 377 #else 378 while (fgets(line, sizeof(line), fd) != NULL) { 379 if ((cp = strchr(line, '\n')) != NULL) 380 *cp = '\0'; 381 reply(-530, "%s", line); 382 } 383 (void) fflush(stdout); 384 (void) fclose(fd); 385 reply(530, 386 "Connection from IPv4 mapped address is not supported."); 387 exit(0); 388 #endif 389 390 mapped = 1; 391 } else 392 #endif 393 mapped = 0; 394 #ifdef IP_TOS 395 if (!mapped && his_addr.su_family == AF_INET) { 396 tos = IPTOS_LOWDELAY; 397 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 398 sizeof(int)) < 0) 399 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 400 } 401 #endif 402 /* if the hostname hasn't been given, attempt to determine it */ 403 if (hostname[0] == '\0') { 404 #ifdef NI_MAXHOST 405 if (getnameinfo((struct sockaddr *)&ctrl_addr, ctrl_addr.su_len, 406 hostname, sizeof(hostname), NULL, 0, 0) != 0) 407 (void)gethostname(hostname, sizeof(hostname)); 408 hostname[sizeof(hostname) - 1] = '\0'; 409 #else 410 struct hostent *hp; 411 if ((hp = gethostbyaddr((const char *)&ctrl_addr, 412 ctrl_addr.su_len, AF_INET)) == NULL) 413 (void)gethostname(hostname, sizeof(hostname)); 414 else 415 (void)strlcpy(hostname, hp->h_name, sizeof(hostname)); 416 #endif 417 } 418 419 /* set this here so klogin can use it... */ 420 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 421 422 (void) freopen(_PATH_DEVNULL, "w", stderr); 423 (void) signal(SIGPIPE, lostconn); 424 (void) signal(SIGCHLD, SIG_IGN); 425 if (signal(SIGURG, myoob) == SIG_ERR) 426 syslog(LOG_ERR, "signal: %m"); 427 428 /* Try to handle urgent data inline */ 429 #ifdef SO_OOBINLINE 430 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 431 syslog(LOG_ERR, "setsockopt: %m"); 432 #endif 433 /* Set keepalives on the socket to detect dropped connections. */ 434 #ifdef SO_KEEPALIVE 435 keepalive = 1; 436 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 437 sizeof(int)) < 0) 438 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 439 #endif 440 441 #ifdef F_SETOWN 442 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 443 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 444 #endif 445 dolog((struct sockaddr *)&his_addr); 446 /* 447 * Set up default state 448 */ 449 data = -1; 450 type = TYPE_A; 451 form = FORM_N; 452 stru = STRU_F; 453 mode = MODE_S; 454 tmpline[0] = '\0'; 455 hasyyerrored = 0; 456 457 #ifdef KERBEROS5 458 kerror = krb5_init_context(&kcontext); 459 if (kerror) { 460 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 461 error_message(kerror)); 462 exit(0); 463 } 464 #endif /* KERBEROS5 */ 465 466 init_curclass(); 467 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 468 curclass.type = CLASS_REAL; 469 470 /* If logins are disabled, print out the message. */ 471 if (display_file(_PATH_NOLOGIN, 530)) { 472 reply(530, "System not available."); 473 exit(0); 474 } 475 (void)display_file(conffilename(_PATH_FTPWELCOME), 220); 476 /* reply(220,) must follow */ 477 if (EMPTYSTR(version)) 478 reply(220, "%s FTP server ready.", hostname); 479 else 480 reply(220, "%s FTP server (%s) ready.", hostname, version); 481 482 (void) setjmp(errcatch); 483 for (;;) 484 (void) yyparse(); 485 /* NOTREACHED */ 486 } 487 488 static void 489 lostconn(int signo) 490 { 491 492 if (debug) 493 syslog(LOG_DEBUG, "lost connection"); 494 dologout(1); 495 } 496 497 /* 498 * Save the result of a getpwnam. Used for USER command, since 499 * the data returned must not be clobbered by any other command 500 * (e.g., globbing). 501 */ 502 static struct passwd * 503 sgetpwnam(const char *name) 504 { 505 static struct passwd save; 506 struct passwd *p; 507 508 if ((p = getpwnam(name)) == NULL) 509 return (p); 510 if (save.pw_name) { 511 free((char *)save.pw_name); 512 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 513 free((char *)save.pw_passwd); 514 free((char *)save.pw_gecos); 515 free((char *)save.pw_dir); 516 free((char *)save.pw_shell); 517 } 518 save = *p; 519 save.pw_name = xstrdup(p->pw_name); 520 save.pw_passwd = xstrdup(p->pw_passwd); 521 save.pw_gecos = xstrdup(p->pw_gecos); 522 save.pw_dir = xstrdup(p->pw_dir); 523 save.pw_shell = xstrdup(p->pw_shell); 524 return (&save); 525 } 526 527 static int login_attempts; /* number of failed login attempts */ 528 static int askpasswd; /* had user command, ask for passwd */ 529 static char curname[10]; /* current USER name */ 530 531 /* 532 * USER command. 533 * Sets global passwd pointer pw if named account exists and is acceptable; 534 * sets askpasswd if a PASS command is expected. If logged in previously, 535 * need to reset state. If name is "ftp" or "anonymous", the name is not in 536 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 537 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 538 * requesting login privileges. Disallow anyone who does not have a standard 539 * shell as returned by getusershell(). Disallow anyone mentioned in the file 540 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 541 */ 542 void 543 user(const char *name) 544 { 545 if (logged_in) { 546 switch (curclass.type) { 547 case CLASS_GUEST: 548 reply(530, "Can't change user from guest login."); 549 return; 550 case CLASS_CHROOT: 551 reply(530, "Can't change user from chroot user."); 552 return; 553 case CLASS_REAL: 554 if (dropprivs) { 555 reply(530, "Can't change user."); 556 return; 557 } 558 end_login(); 559 break; 560 default: 561 abort(); 562 } 563 } 564 565 #if defined(KERBEROS) 566 kdestroy(); 567 #endif 568 #if defined(KERBEROS5) 569 k5destroy(); 570 #endif 571 572 curclass.type = CLASS_REAL; 573 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 574 /* need `pw' setup for checkaccess() and checkuser () */ 575 if ((pw = sgetpwnam("ftp")) == NULL) 576 reply(530, "User %s unknown.", name); 577 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 578 reply(530, "User %s access denied.", name); 579 else { 580 curclass.type = CLASS_GUEST; 581 askpasswd = 1; 582 reply(331, 583 "Guest login ok, type your name as password."); 584 } 585 if (!askpasswd && logging) 586 syslog(LOG_NOTICE, 587 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 588 return; 589 } 590 591 pw = sgetpwnam(name); 592 if (logging) 593 strlcpy(curname, name, sizeof(curname)); 594 595 #ifdef SKEY 596 if (skey_haskey(name) == 0) { 597 const char *myskey; 598 599 myskey = skey_keyinfo(name); 600 reply(331, "Password [%s] required for %s.", 601 myskey ? myskey : "error getting challenge", name); 602 } else 603 #endif 604 reply(331, "Password required for %s.", name); 605 606 askpasswd = 1; 607 /* 608 * Delay before reading passwd after first failed 609 * attempt to slow down passwd-guessing programs. 610 */ 611 if (login_attempts) 612 sleep((unsigned) login_attempts); 613 } 614 615 /* 616 * Determine whether something is to happen (allow access, chroot) 617 * for a user. Each line is a shell-style glob followed by 618 * `yes' or `no'. 619 * 620 * For backward compatability, `allow' and `deny' are synonymns 621 * for `yes' and `no', respectively. 622 * 623 * Each glob is matched against the username in turn, and the first 624 * match found is used. If no match is found, the result is the 625 * argument `def'. If a match is found but without and explicit 626 * `yes'/`no', the result is the opposite of def. 627 * 628 * If the file doesn't exist at all, the result is the argument 629 * `nofile' 630 * 631 * Any line starting with `#' is considered a comment and ignored. 632 * 633 * Returns 0 if the user is denied, or 1 if they are allowed. 634 * 635 * NOTE: needs struct passwd *pw setup before use. 636 */ 637 int 638 checkuser(const char *fname, const char *name, int def, int nofile, 639 char **retclass) 640 { 641 FILE *fd; 642 int retval; 643 char *glob, *perm, *class, *buf, *p; 644 size_t len, line; 645 646 retval = def; 647 if (retclass != NULL) 648 *retclass = NULL; 649 if ((fd = fopen(conffilename(fname), "r")) == NULL) 650 return nofile; 651 652 line = 0; 653 for (; 654 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 655 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 656 free(buf), buf = NULL) { 657 glob = perm = class = NULL; 658 p = buf; 659 if (len < 1) 660 continue; 661 if (p[len - 1] == '\n') 662 p[--len] = '\0'; 663 if (EMPTYSTR(p)) 664 continue; 665 666 NEXTWORD(p, glob); 667 NEXTWORD(p, perm); 668 NEXTWORD(p, class); 669 if (EMPTYSTR(glob)) 670 continue; 671 if (!EMPTYSTR(class)) { 672 if (strcasecmp(class, "all") == 0 || 673 strcasecmp(class, "none") == 0) { 674 syslog(LOG_WARNING, 675 "%s line %d: illegal user-defined class `%s' - skipping entry", 676 fname, (int)line, class); 677 continue; 678 } 679 } 680 681 /* have a host specifier */ 682 if ((p = strchr(glob, '@')) != NULL) { 683 u_int32_t net, mask, addr; 684 int bits; 685 686 *p++ = '\0'; 687 /* check against network or CIDR */ 688 if (isdigit(*p) && 689 (bits = inet_net_pton(AF_INET, p, 690 &net, sizeof(net))) != -1) { 691 net = ntohl(net); 692 mask = 0xffffffffU << (32 - bits); 693 addr = ntohl(his_addr.su_sin.sin_addr.s_addr); 694 if ((addr & mask) != net) 695 continue; 696 697 /* check against hostname glob */ 698 } else if (fnmatch(p, remotehost, 0) != 0) 699 continue; 700 } 701 702 /* have a group specifier */ 703 if ((p = strchr(glob, ':')) != NULL) { 704 gid_t *groups, *ng; 705 int gsize, i, found; 706 707 *p++ = '\0'; 708 groups = NULL; 709 gsize = 16; 710 do { 711 ng = realloc(groups, gsize * sizeof(gid_t)); 712 if (ng == NULL) 713 fatal( 714 "Local resource failure: realloc"); 715 groups = ng; 716 } while (getgrouplist(pw->pw_name, pw->pw_gid, 717 groups, &gsize) == -1); 718 found = 0; 719 for (i = 0; i < gsize; i++) { 720 struct group *g; 721 722 if ((g = getgrgid(groups[i])) == NULL) 723 continue; 724 if (fnmatch(p, g->gr_name, 0) == 0) { 725 found = 1; 726 break; 727 } 728 } 729 free(groups); 730 if (!found) 731 continue; 732 } 733 734 /* check against username glob */ 735 if (fnmatch(glob, name, 0) != 0) 736 continue; 737 738 if (perm != NULL && 739 ((strcasecmp(perm, "allow") == 0) || 740 (strcasecmp(perm, "yes") == 0))) 741 retval = 1; 742 else if (perm != NULL && 743 ((strcasecmp(perm, "deny") == 0) || 744 (strcasecmp(perm, "no") == 0))) 745 retval = 0; 746 else 747 retval = !def; 748 if (!EMPTYSTR(class) && retclass != NULL) 749 *retclass = xstrdup(class); 750 free(buf); 751 break; 752 } 753 (void) fclose(fd); 754 return (retval); 755 } 756 757 /* 758 * Check if user is allowed by /etc/ftpusers 759 * returns 1 for yes, 0 for no 760 * 761 * NOTE: needs struct passwd *pw setup (for checkuser()) 762 */ 763 int 764 checkaccess(const char *name) 765 { 766 767 return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL)); 768 } 769 770 /* 771 * Terminate login as previous user, if any, resetting state; 772 * used when USER command is given or login fails. 773 */ 774 static void 775 end_login(void) 776 { 777 778 if (logged_in) { 779 if (dowtmp) 780 logwtmp(ttyline, "", ""); 781 if (doutmp) 782 logout(utmp.ut_line); 783 } 784 /* reset login state */ 785 (void) seteuid((uid_t)0); 786 pw = NULL; 787 logged_in = 0; 788 quietmessages = 0; 789 gidcount = 0; 790 curclass.type = CLASS_REAL; 791 } 792 793 void 794 pass(const char *passwd) 795 { 796 int rval; 797 const char *cp, *shell; 798 char *class, root[MAXPATHLEN]; 799 800 class = NULL; 801 if (logged_in || askpasswd == 0) { 802 reply(503, "Login with USER first."); 803 return; 804 } 805 askpasswd = 0; 806 if (curclass.type != CLASS_GUEST) { 807 /* "ftp" is the only account allowed with no password */ 808 if (pw == NULL) { 809 rval = 1; /* failure below */ 810 goto skip; 811 } 812 #if defined(KERBEROS) 813 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 814 rval = 0; 815 goto skip; 816 } 817 #endif 818 #if defined(KERBEROS5) 819 if (k5login(pw, "", hostname, (char *)passwd) == 0) { 820 rval = 0; 821 goto skip; 822 } 823 #endif 824 #ifdef SKEY 825 if (skey_haskey(pw->pw_name) == 0) { 826 char *p; 827 int r; 828 829 p = xstrdup(passwd); 830 r = skey_passcheck(pw->pw_name, p); 831 free(p); 832 if (r != -1) { 833 rval = 0; 834 goto skip; 835 } 836 } 837 #endif 838 if (!sflag && *pw->pw_passwd != '\0' && 839 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 840 rval = 0; 841 goto skip; 842 } 843 rval = 1; 844 845 skip: 846 if (pw != NULL && pw->pw_expire && time(NULL) >= pw->pw_expire) 847 rval = 2; 848 849 /* 850 * If rval > 0, the user failed the authentication check 851 * above. If rval == 0, either Kerberos or local 852 * authentication succeeded. 853 */ 854 if (rval) { 855 reply(530, "%s", rval == 2 ? "Password expired." : 856 "Login incorrect."); 857 if (logging) { 858 syslog(LOG_NOTICE, 859 "FTP LOGIN FAILED FROM %s", remotehost); 860 syslog(LOG_AUTHPRIV | LOG_NOTICE, 861 "FTP LOGIN FAILED FROM %s, %s", 862 remotehost, curname); 863 } 864 pw = NULL; 865 if (login_attempts++ >= 5) { 866 syslog(LOG_NOTICE, 867 "repeated login failures from %s", 868 remotehost); 869 exit(0); 870 } 871 return; 872 } 873 } 874 875 /* password ok; see if anything else prevents login */ 876 if (! checkuser(_PATH_FTPUSERS, pw->pw_name, 1, 0, &class)) { 877 reply(530, "User %s may not use FTP.", pw->pw_name); 878 if (logging) 879 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 880 remotehost, pw->pw_name); 881 goto bad; 882 } 883 /* if not guest user, check for valid shell */ 884 if ((shell = pw->pw_shell) == NULL || *shell == 0) 885 shell = _PATH_BSHELL; 886 while ((cp = getusershell()) != NULL) 887 if (strcmp(cp, shell) == 0) 888 break; 889 endusershell(); 890 if (cp == NULL && curclass.type != CLASS_GUEST) { 891 reply(530, "User %s may not use FTP.", pw->pw_name); 892 if (logging) 893 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 894 remotehost, pw->pw_name); 895 goto bad; 896 } 897 898 login_attempts = 0; /* this time successful */ 899 if (setegid((gid_t)pw->pw_gid) < 0) { 900 reply(550, "Can't set gid."); 901 goto bad; 902 } 903 (void) initgroups(pw->pw_name, pw->pw_gid); 904 /* cache groups for cmds.c::matchgroup() */ 905 gidcount = getgroups(sizeof(gidlist), gidlist); 906 907 /* open wtmp before chroot */ 908 if (dowtmp) 909 logwtmp(ttyline, pw->pw_name, remotehost); 910 911 /* open utmp before chroot */ 912 if (doutmp) { 913 memset((void *)&utmp, 0, sizeof(utmp)); 914 (void)time(&utmp.ut_time); 915 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 916 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 917 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 918 login(&utmp); 919 } 920 921 logged_in = 1; 922 923 /* check user in /etc/ftpchroot */ 924 if (checkuser(_PATH_FTPCHROOT, pw->pw_name, 0, 0, NULL)) { 925 if (curclass.type == CLASS_GUEST) { 926 syslog(LOG_NOTICE, 927 "Can't change guest user to chroot class; remove entry in %s", 928 _PATH_FTPCHROOT); 929 exit(1); 930 } 931 curclass.type = CLASS_CHROOT; 932 } 933 if (class == NULL) { 934 switch (curclass.type) { 935 case CLASS_GUEST: 936 class = xstrdup("guest"); 937 break; 938 case CLASS_CHROOT: 939 class = xstrdup("chroot"); 940 break; 941 case CLASS_REAL: 942 class = xstrdup("real"); 943 break; 944 default: 945 abort(); 946 } 947 } 948 949 /* parse ftpd.conf, setting up various parameters */ 950 parse_conf(class); 951 count_users(); 952 if (curclass.limit != -1 && connections > curclass.limit) { 953 if (! EMPTYSTR(curclass.limitfile)) 954 (void)display_file(conffilename(curclass.limitfile), 955 530); 956 reply(530, 957 "User %s access denied, connection limit of %d reached.", 958 pw->pw_name, curclass.limit); 959 syslog(LOG_NOTICE, 960 "Maximum connection limit of %d for class %s reached, login refused for %s", 961 curclass.limit, curclass.classname, pw->pw_name); 962 goto bad; 963 } 964 965 homedir[0] = '/'; 966 switch (curclass.type) { 967 case CLASS_GUEST: 968 /* 969 * We MUST do a chdir() after the chroot. Otherwise 970 * the old current directory will be accessible as "." 971 * outside the new root! 972 */ 973 format_path(root, 974 curclass.chroot ? curclass.chroot : 975 anondir ? anondir : 976 pw->pw_dir); 977 format_path(homedir, 978 curclass.homedir ? curclass.homedir : 979 "/"); 980 if (EMPTYSTR(homedir)) 981 homedir[0] = '/'; 982 if (EMPTYSTR(root) || chroot(root) < 0) { 983 syslog(LOG_NOTICE, 984 "GUEST user %s: can't chroot to %s: %m", 985 pw->pw_name, root); 986 goto bad_guest; 987 } 988 if (chdir(homedir) < 0) { 989 syslog(LOG_NOTICE, 990 "GUEST user %s: can't chdir to %s: %m", 991 pw->pw_name, homedir); 992 bad_guest: 993 reply(550, "Can't set guest privileges."); 994 goto bad; 995 } 996 break; 997 case CLASS_CHROOT: 998 format_path(root, 999 curclass.chroot ? curclass.chroot : 1000 pw->pw_dir); 1001 format_path(homedir, 1002 curclass.homedir ? curclass.homedir : 1003 "/"); 1004 if (EMPTYSTR(homedir)) 1005 homedir[0] = '/'; 1006 if (EMPTYSTR(root) || chroot(root) < 0) { 1007 syslog(LOG_NOTICE, 1008 "CHROOT user %s: can't chroot to %s: %m", 1009 pw->pw_name, root); 1010 goto bad_chroot; 1011 } 1012 if (chdir(homedir) < 0) { 1013 syslog(LOG_NOTICE, 1014 "CHROOT user %s: can't chdir to %s: %m", 1015 pw->pw_name, homedir); 1016 bad_chroot: 1017 reply(550, "Can't change root."); 1018 goto bad; 1019 } 1020 break; 1021 case CLASS_REAL: 1022 format_path(homedir, 1023 curclass.homedir ? curclass.homedir : 1024 pw->pw_dir); 1025 if (EMPTYSTR(homedir) || chdir(homedir) < 0) { 1026 if (chdir("/") < 0) { 1027 syslog(LOG_NOTICE, 1028 "REAL user %s: can't chdir to %s: %m", 1029 pw->pw_name, 1030 !EMPTYSTR(homedir) ? homedir : "/"); 1031 reply(530, 1032 "User %s: can't change directory to %s.", 1033 pw->pw_name, 1034 !EMPTYSTR(homedir) ? homedir : "/"); 1035 goto bad; 1036 } else { 1037 reply(-230, 1038 "No directory! Logging in with home=/"); 1039 homedir[0] = '/'; 1040 } 1041 } 1042 break; 1043 } 1044 if (dropprivs || 1045 (curclass.type != CLASS_REAL && 1046 ntohs(ctrl_addr.su_port) > IPPORT_RESERVED + 1)) { 1047 dropprivs++; 1048 if (setgid((gid_t)pw->pw_gid) < 0) { 1049 reply(550, "Can't set gid."); 1050 goto bad; 1051 } 1052 if (setuid((uid_t)pw->pw_uid) < 0) { 1053 reply(550, "Can't set uid."); 1054 goto bad; 1055 } 1056 } else { 1057 if (seteuid((uid_t)pw->pw_uid) < 0) { 1058 reply(550, "Can't set uid."); 1059 goto bad; 1060 } 1061 } 1062 setenv("HOME", homedir, 1); 1063 1064 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 1065 quietmessages = 1; 1066 1067 /* 1068 * Display a login message, if it exists. 1069 * N.B. reply(230,) must follow the message. 1070 */ 1071 (void)display_file(conffilename(curclass.motd), 230); 1072 show_chdir_messages(230); 1073 if (curclass.type == CLASS_GUEST) { 1074 reply(230, "Guest login ok, access restrictions apply."); 1075 #ifdef HASSETPROCTITLE 1076 snprintf(proctitle, sizeof(proctitle), 1077 "%s: anonymous/%.*s", remotehost, 1078 (int) (sizeof(proctitle) - sizeof(remotehost) - 1079 sizeof(": anonymous/")), passwd); 1080 setproctitle("%s", proctitle); 1081 #endif /* HASSETPROCTITLE */ 1082 if (logging) 1083 syslog(LOG_INFO, 1084 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 1085 remotehost, passwd, 1086 curclass.classname, CURCLASSTYPE); 1087 } else { 1088 reply(230, "User %s logged in.", pw->pw_name); 1089 #ifdef HASSETPROCTITLE 1090 snprintf(proctitle, sizeof(proctitle), 1091 "%s: %s", remotehost, pw->pw_name); 1092 setproctitle("%s", proctitle); 1093 #endif /* HASSETPROCTITLE */ 1094 if (logging) 1095 syslog(LOG_INFO, 1096 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1097 remotehost, pw->pw_name, 1098 curclass.classname, CURCLASSTYPE); 1099 } 1100 (void) umask(curclass.umask); 1101 goto cleanuppass; 1102 bad: 1103 /* Forget all about it... */ 1104 end_login(); 1105 cleanuppass: 1106 if (class) 1107 free(class); 1108 } 1109 1110 void 1111 retrieve(char *argv[], const char *name) 1112 { 1113 FILE *fin, *dout; 1114 struct stat st; 1115 int (*closefunc)(FILE *) = NULL; 1116 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1117 struct timeval start, finish, td, *tdp; 1118 const char *dispname; 1119 1120 sendrv = closerv = stderrfd = -1; 1121 isconversion = isdata = isls = log = 0; 1122 tdp = NULL; 1123 dispname = name; 1124 fin = dout = NULL; 1125 if (argv == NULL) { 1126 log = 1; 1127 isdata = 1; 1128 fin = fopen(name, "r"); 1129 closefunc = fclose; 1130 if (fin == NULL) 1131 argv = do_conversion(name); 1132 if (argv != NULL) { 1133 isconversion++; 1134 syslog(LOG_INFO, "get command: '%s' on '%s'", 1135 argv[0], name); 1136 } 1137 } 1138 if (argv != NULL) { 1139 char temp[MAXPATHLEN]; 1140 1141 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1142 isls = 1; 1143 stderrfd = -1; 1144 } else { 1145 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1146 stderrfd = mkstemp(temp); 1147 if (stderrfd != -1) 1148 (void)unlink(temp); 1149 } 1150 dispname = argv[0]; 1151 fin = ftpd_popen(argv, "r", stderrfd); 1152 closefunc = ftpd_pclose; 1153 st.st_size = -1; 1154 st.st_blksize = BUFSIZ; 1155 } 1156 if (fin == NULL) { 1157 if (errno != 0) { 1158 perror_reply(550, dispname); 1159 if (log) 1160 logcmd("get", -1, name, NULL, NULL, 1161 strerror(errno)); 1162 } 1163 goto cleanupretrieve; 1164 } 1165 byte_count = -1; 1166 if (argv == NULL 1167 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1168 reply(550, "%s: not a plain file.", dispname); 1169 goto done; 1170 } 1171 if (restart_point) { 1172 if (type == TYPE_A) { 1173 off_t i; 1174 int c; 1175 1176 for (i = 0; i < restart_point; i++) { 1177 if ((c=getc(fin)) == EOF) { 1178 perror_reply(550, dispname); 1179 goto done; 1180 } 1181 if (c == '\n') 1182 i++; 1183 } 1184 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1185 perror_reply(550, dispname); 1186 goto done; 1187 } 1188 } 1189 dout = dataconn(dispname, st.st_size, "w"); 1190 if (dout == NULL) 1191 goto done; 1192 1193 (void)gettimeofday(&start, NULL); 1194 sendrv = send_data(fin, dout, st.st_blksize, isdata); 1195 (void)gettimeofday(&finish, NULL); 1196 (void) fclose(dout); /* close now to affect timing stats */ 1197 dout = NULL; 1198 timersub(&finish, &start, &td); 1199 tdp = &td; 1200 done: 1201 if (log) 1202 logcmd("get", byte_count, name, NULL, tdp, NULL); 1203 closerv = (*closefunc)(fin); 1204 if (sendrv == 0) { 1205 FILE *err; 1206 struct stat sb; 1207 1208 if (!isls && argv != NULL && closerv != 0) { 1209 reply(-226, 1210 "Command returned an exit status of %d", 1211 closerv); 1212 if (isconversion) 1213 syslog(LOG_INFO, 1214 "retrieve command: '%s' returned %d", 1215 argv[0], closerv); 1216 } 1217 if (!isls && argv != NULL && stderrfd != -1 && 1218 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1219 ((err = fdopen(stderrfd, "r")) != NULL)) { 1220 char *cp, line[LINE_MAX]; 1221 1222 reply(-226, "Command error messages:"); 1223 rewind(err); 1224 while (fgets(line, sizeof(line), err) != NULL) { 1225 if ((cp = strchr(line, '\n')) != NULL) 1226 *cp = '\0'; 1227 reply(0, " %s", line); 1228 } 1229 (void) fflush(stdout); 1230 (void) fclose(err); 1231 /* a reply(226,) must follow */ 1232 } 1233 reply(226, "Transfer complete."); 1234 } 1235 cleanupretrieve: 1236 closedataconn(dout); 1237 if (stderrfd != -1) 1238 (void)close(stderrfd); 1239 if (isconversion) 1240 free(argv); 1241 } 1242 1243 void 1244 store(const char *name, const char *mode, int unique) 1245 { 1246 FILE *fout, *din; 1247 struct stat st; 1248 int (*closefunc)(FILE *); 1249 struct timeval start, finish, td, *tdp; 1250 char *desc; 1251 1252 din = NULL; 1253 desc = (*mode == 'w') ? "put" : "append"; 1254 if (unique && stat(name, &st) == 0 && 1255 (name = gunique(name)) == NULL) { 1256 logcmd(desc, -1, name, NULL, NULL, "cannot create unique file"); 1257 goto cleanupstore; 1258 } 1259 1260 if (restart_point) 1261 mode = "r+"; 1262 fout = fopen(name, mode); 1263 closefunc = fclose; 1264 tdp = NULL; 1265 if (fout == NULL) { 1266 perror_reply(553, name); 1267 logcmd(desc, -1, name, NULL, NULL, strerror(errno)); 1268 goto cleanupstore; 1269 } 1270 byte_count = -1; 1271 if (restart_point) { 1272 if (type == TYPE_A) { 1273 off_t i; 1274 int c; 1275 1276 for (i = 0; i < restart_point; i++) { 1277 if ((c=getc(fout)) == EOF) { 1278 perror_reply(550, name); 1279 goto done; 1280 } 1281 if (c == '\n') 1282 i++; 1283 } 1284 /* 1285 * We must do this seek to "current" position 1286 * because we are changing from reading to 1287 * writing. 1288 */ 1289 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1290 perror_reply(550, name); 1291 goto done; 1292 } 1293 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1294 perror_reply(550, name); 1295 goto done; 1296 } 1297 } 1298 din = dataconn(name, (off_t)-1, "r"); 1299 if (din == NULL) 1300 goto done; 1301 (void)gettimeofday(&start, NULL); 1302 if (receive_data(din, fout) == 0) { 1303 if (unique) 1304 reply(226, "Transfer complete (unique file name:%s).", 1305 name); 1306 else 1307 reply(226, "Transfer complete."); 1308 } 1309 (void)gettimeofday(&finish, NULL); 1310 (void) fclose(din); /* close now to affect timing stats */ 1311 din = NULL; 1312 timersub(&finish, &start, &td); 1313 tdp = &td; 1314 done: 1315 logcmd(desc, byte_count, name, NULL, tdp, NULL); 1316 (*closefunc)(fout); 1317 cleanupstore: 1318 closedataconn(din); 1319 } 1320 1321 static FILE * 1322 getdatasock(const char *mode) 1323 { 1324 int on, s, t, tries; 1325 in_port_t port; 1326 1327 on = 1; 1328 if (data >= 0) 1329 return (fdopen(data, mode)); 1330 if (! dropprivs) 1331 (void) seteuid((uid_t)0); 1332 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1333 if (s < 0) 1334 goto bad; 1335 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1336 (char *) &on, sizeof(on)) < 0) 1337 goto bad; 1338 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1339 (char *) &on, sizeof(on)) < 0) 1340 goto bad; 1341 /* anchor socket to avoid multi-homing problems */ 1342 data_source = ctrl_addr; 1343 /* 1344 * By default source port for PORT connctions is 1345 * ctrlport-1 (see RFC959 section 5.2). 1346 * However, if privs have been dropped and that 1347 * would be < IPPORT_RESERVED, use a random port 1348 * instead. 1349 */ 1350 port = ntohs(ctrl_addr.su_port) - 1; 1351 if (dropprivs && port < IPPORT_RESERVED) 1352 port = 0; /* use random port */ 1353 data_source.su_port = htons(port); 1354 1355 for (tries = 1; ; tries++) { 1356 if (bind(s, (struct sockaddr *)&data_source, 1357 data_source.su_len) >= 0) 1358 break; 1359 if (errno != EADDRINUSE || tries > 10) 1360 goto bad; 1361 sleep(tries); 1362 } 1363 if (! dropprivs) 1364 (void) seteuid((uid_t)pw->pw_uid); 1365 #ifdef IP_TOS 1366 if (!mapped && ctrl_addr.su_family == AF_INET) { 1367 on = IPTOS_THROUGHPUT; 1368 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1369 sizeof(int)) < 0) 1370 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1371 } 1372 #endif 1373 return (fdopen(s, mode)); 1374 bad: 1375 /* Return the real value of errno (close may change it) */ 1376 t = errno; 1377 if (! dropprivs) 1378 (void) seteuid((uid_t)pw->pw_uid); 1379 (void) close(s); 1380 errno = t; 1381 return (NULL); 1382 } 1383 1384 FILE * 1385 dataconn(const char *name, off_t size, const char *mode) 1386 { 1387 char sizebuf[32]; 1388 FILE *file; 1389 int retry = 0, tos, keepalive; 1390 1391 file_size = size; 1392 byte_count = 0; 1393 if (size != (off_t) -1) 1394 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd byte%s)", 1395 (qdfmt_t)size, PLURAL(size)); 1396 else 1397 sizebuf[0] = '\0'; 1398 if (pdata >= 0) { 1399 union sockunion from; 1400 int s, fromlen = sizeof(from); 1401 1402 (void) alarm(curclass.timeout); 1403 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1404 (void) alarm(0); 1405 if (s < 0) { 1406 reply(425, "Can't open data connection."); 1407 (void) close(pdata); 1408 pdata = -1; 1409 return (NULL); 1410 } 1411 (void) close(pdata); 1412 pdata = s; 1413 switch (from.su_family) { 1414 case AF_INET: 1415 #ifdef IP_TOS 1416 if (!mapped) { 1417 tos = IPTOS_THROUGHPUT; 1418 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1419 (char *)&tos, sizeof(int)); 1420 } 1421 break; 1422 #endif 1423 } 1424 /* Set keepalives on the socket to detect dropped conns. */ 1425 #ifdef SO_KEEPALIVE 1426 keepalive = 1; 1427 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1428 (char *)&keepalive, sizeof(int)); 1429 #endif 1430 reply(150, "Opening %s mode data connection for '%s'%s.", 1431 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1432 return (fdopen(pdata, mode)); 1433 } 1434 if (data >= 0) { 1435 reply(125, "Using existing data connection for '%s'%s.", 1436 name, sizebuf); 1437 usedefault = 1; 1438 return (fdopen(data, mode)); 1439 } 1440 if (usedefault) 1441 data_dest = his_addr; 1442 usedefault = 1; 1443 file = getdatasock(mode); 1444 if (file == NULL) { 1445 char hbuf[INET6_ADDRSTRLEN]; 1446 char pbuf[10]; 1447 #ifdef NI_NUMERICHOST 1448 (void)getnameinfo((struct sockaddr *)&data_source, 1449 data_source.su_len, hbuf, sizeof(hbuf), 1450 pbuf, sizeof(pbuf), NI_NUMERICHOST | NI_NUMERICSERV); 1451 #else 1452 struct hostent *hp; 1453 if ((hp = gethostbyaddr((const char *)&data_source, 1454 data_source.su_len, AF_INET)) == NULL) 1455 (void)strcpy(hostname, 1456 inet_ntoa(data_source.su_sin.sin_addr)); 1457 else 1458 (void)strlcpy(hostname, hp->h_name, sizeof(hostname)); 1459 (void)snprintf(pbuf, sizeof(pbuf), "%d", data_source.su_port); 1460 #endif 1461 reply(425, "Can't create data socket (%s,%s): %s.", 1462 hbuf, pbuf, strerror(errno)); 1463 return (NULL); 1464 } 1465 data = fileno(file); 1466 while (connect(data, (struct sockaddr *)&data_dest, 1467 data_dest.su_len) < 0) { 1468 if (errno == EADDRINUSE && retry < swaitmax) { 1469 sleep((unsigned) swaitint); 1470 retry += swaitint; 1471 continue; 1472 } 1473 perror_reply(425, "Can't build data connection"); 1474 (void) fclose(file); 1475 data = -1; 1476 return (NULL); 1477 } 1478 reply(150, "Opening %s mode data connection for '%s'%s.", 1479 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1480 return (file); 1481 } 1482 1483 void 1484 closedataconn(FILE *fd) 1485 { 1486 1487 if (fd != NULL) 1488 (void)fclose(fd); 1489 data = -1; 1490 if (pdata >= 0) 1491 (void)close(pdata); 1492 pdata = -1; 1493 } 1494 1495 /* 1496 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1497 * encapsulation of the data subject * to Mode, Structure, and Type. 1498 * 1499 * NB: Form isn't handled. 1500 */ 1501 static int 1502 send_data(FILE *instr, FILE *outstr, off_t blksize, int isdata) 1503 { 1504 int c, filefd, netfd, rval; 1505 char *buf; 1506 1507 transflag = 1; 1508 rval = -1; 1509 buf = NULL; 1510 if (setjmp(urgcatch)) 1511 goto cleanup_send_data; 1512 1513 switch (type) { 1514 1515 case TYPE_A: 1516 /* XXXX: rate limit ascii send (get) */ 1517 (void) alarm(curclass.timeout); 1518 while ((c = getc(instr)) != EOF) { 1519 byte_count++; 1520 if (c == '\n') { 1521 if (ferror(outstr)) 1522 goto data_err; 1523 (void) putc('\r', outstr); 1524 if (isdata) { 1525 total_data_out++; 1526 total_data++; 1527 } 1528 total_bytes_out++; 1529 total_bytes++; 1530 } 1531 (void) putc(c, outstr); 1532 if (isdata) { 1533 total_data_out++; 1534 total_data++; 1535 } 1536 total_bytes_out++; 1537 total_bytes++; 1538 if ((byte_count % 4096) == 0) 1539 (void) alarm(curclass.timeout); 1540 } 1541 (void) alarm(0); 1542 fflush(outstr); 1543 if (ferror(instr)) 1544 goto file_err; 1545 if (ferror(outstr)) 1546 goto data_err; 1547 rval = 0; 1548 goto cleanup_send_data; 1549 1550 case TYPE_I: 1551 case TYPE_L: 1552 if ((buf = malloc((size_t)blksize)) == NULL) { 1553 perror_reply(451, "Local resource failure: malloc"); 1554 goto cleanup_send_data; 1555 } 1556 filefd = fileno(instr); 1557 netfd = fileno(outstr); 1558 (void) alarm(curclass.timeout); 1559 if (curclass.rateget) { 1560 while (1) { 1561 int d; 1562 struct timeval then, now, td; 1563 off_t bufrem; 1564 char *bufp; 1565 1566 (void)gettimeofday(&then, NULL); 1567 errno = c = d = 0; 1568 bufrem = curclass.rateget; 1569 while (bufrem > 0) { 1570 if ((c = read(filefd, buf, 1571 MIN(blksize, bufrem))) <= 0) 1572 goto senddone; 1573 (void) alarm(curclass.timeout); 1574 bufrem -= c; 1575 byte_count += c; 1576 if (isdata) { 1577 total_data_out += c; 1578 total_data += c; 1579 } 1580 total_bytes_out += c; 1581 total_bytes += c; 1582 for (bufp = buf; c > 0; 1583 c -= d, bufp += d) 1584 if ((d = 1585 write(netfd, bufp, c)) <= 0) 1586 break; 1587 if (d < 0) 1588 goto data_err; 1589 } 1590 (void)gettimeofday(&now, NULL); 1591 timersub(&now, &then, &td); 1592 if (td.tv_sec == 0) 1593 usleep(1000000 - td.tv_usec); 1594 } 1595 } else { 1596 while ((c = read(filefd, buf, (size_t)blksize)) > 0) { 1597 if (write(netfd, buf, c) != c) 1598 goto data_err; 1599 (void) alarm(curclass.timeout); 1600 byte_count += c; 1601 if (isdata) { 1602 total_data_out += c; 1603 total_data += c; 1604 } 1605 total_bytes_out += c; 1606 total_bytes += c; 1607 } 1608 } 1609 senddone: 1610 if (c < 0) 1611 goto file_err; 1612 rval = 0; 1613 goto cleanup_send_data; 1614 1615 default: 1616 reply(550, "Unimplemented TYPE %d in send_data", type); 1617 goto cleanup_send_data; 1618 } 1619 1620 data_err: 1621 (void) alarm(0); 1622 perror_reply(426, "Data connection"); 1623 goto cleanup_send_data; 1624 1625 file_err: 1626 (void) alarm(0); 1627 perror_reply(551, "Error on input file"); 1628 /* FALLTHROUGH */ 1629 1630 cleanup_send_data: 1631 (void) alarm(0); 1632 transflag = 0; 1633 if (buf) 1634 free(buf); 1635 if (isdata) { 1636 total_files_out++; 1637 total_files++; 1638 } 1639 total_xfers_out++; 1640 total_xfers++; 1641 return (rval); 1642 } 1643 1644 /* 1645 * Transfer data from peer to "outstr" using the appropriate encapulation of 1646 * the data subject to Mode, Structure, and Type. 1647 * 1648 * N.B.: Form isn't handled. 1649 */ 1650 static int 1651 receive_data(FILE *instr, FILE *outstr) 1652 { 1653 int c, bare_lfs, netfd, filefd, rval; 1654 char buf[BUFSIZ]; 1655 #ifdef __GNUC__ 1656 (void) &bare_lfs; 1657 #endif 1658 1659 bare_lfs = 0; 1660 transflag = 1; 1661 rval = -1; 1662 if (setjmp(urgcatch)) 1663 goto cleanup_recv_data; 1664 1665 switch (type) { 1666 1667 case TYPE_I: 1668 case TYPE_L: 1669 netfd = fileno(instr); 1670 filefd = fileno(outstr); 1671 (void) alarm(curclass.timeout); 1672 if (curclass.rateput) { 1673 while (1) { 1674 int d; 1675 struct timeval then, now, td; 1676 off_t bufrem; 1677 1678 (void)gettimeofday(&then, NULL); 1679 errno = c = d = 0; 1680 for (bufrem = curclass.rateput; bufrem > 0; ) { 1681 if ((c = read(netfd, buf, 1682 MIN(sizeof(buf), bufrem))) <= 0) 1683 goto recvdone; 1684 if ((d = write(filefd, buf, c)) != c) 1685 goto recvdone; 1686 (void) alarm(curclass.timeout); 1687 bufrem -= c; 1688 byte_count += c; 1689 total_data_in += c; 1690 total_data += c; 1691 total_bytes_in += c; 1692 total_bytes += c; 1693 } 1694 (void)gettimeofday(&now, NULL); 1695 timersub(&now, &then, &td); 1696 if (td.tv_sec == 0) 1697 usleep(1000000 - td.tv_usec); 1698 } 1699 } else { 1700 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1701 if (write(filefd, buf, c) != c) 1702 goto file_err; 1703 (void) alarm(curclass.timeout); 1704 byte_count += c; 1705 total_data_in += c; 1706 total_data += c; 1707 total_bytes_in += c; 1708 total_bytes += c; 1709 } 1710 } 1711 recvdone: 1712 if (c < 0) 1713 goto data_err; 1714 rval = 0; 1715 goto cleanup_recv_data; 1716 1717 case TYPE_E: 1718 reply(553, "TYPE E not implemented."); 1719 goto cleanup_recv_data; 1720 1721 case TYPE_A: 1722 (void) alarm(curclass.timeout); 1723 /* XXXX: rate limit ascii receive (put) */ 1724 while ((c = getc(instr)) != EOF) { 1725 byte_count++; 1726 total_data_in++; 1727 total_data++; 1728 total_bytes_in++; 1729 total_bytes++; 1730 if ((byte_count % 4096) == 0) 1731 (void) alarm(curclass.timeout); 1732 if (c == '\n') 1733 bare_lfs++; 1734 while (c == '\r') { 1735 if (ferror(outstr)) 1736 goto data_err; 1737 if ((c = getc(instr)) != '\n') { 1738 byte_count++; 1739 total_data_in++; 1740 total_data++; 1741 total_bytes_in++; 1742 total_bytes++; 1743 if ((byte_count % 4096) == 0) 1744 (void) alarm(curclass.timeout); 1745 (void) putc ('\r', outstr); 1746 if (c == '\0' || c == EOF) 1747 goto contin2; 1748 } 1749 } 1750 (void) putc(c, outstr); 1751 contin2: ; 1752 } 1753 (void) alarm(0); 1754 fflush(outstr); 1755 if (ferror(instr)) 1756 goto data_err; 1757 if (ferror(outstr)) 1758 goto file_err; 1759 if (bare_lfs) { 1760 reply(-226, 1761 "WARNING! %d bare linefeeds received in ASCII mode", 1762 bare_lfs); 1763 reply(0, "File may not have transferred correctly."); 1764 } 1765 rval = 0; 1766 goto cleanup_recv_data; 1767 1768 default: 1769 reply(550, "Unimplemented TYPE %d in receive_data", type); 1770 goto cleanup_recv_data; 1771 } 1772 1773 data_err: 1774 (void) alarm(0); 1775 perror_reply(426, "Data Connection"); 1776 goto cleanup_recv_data; 1777 1778 file_err: 1779 (void) alarm(0); 1780 perror_reply(452, "Error writing file"); 1781 goto cleanup_recv_data; 1782 1783 cleanup_recv_data: 1784 (void) alarm(0); 1785 transflag = 0; 1786 total_files_in++; 1787 total_files++; 1788 total_xfers_in++; 1789 total_xfers++; 1790 return (rval); 1791 } 1792 1793 void 1794 statcmd(void) 1795 { 1796 union sockunion *su = NULL; 1797 static char ntop_buf[INET6_ADDRSTRLEN]; 1798 u_char *a, *p; 1799 int ispassive, af; 1800 off_t otbi, otbo, otb; 1801 1802 a = p = (u_char *)NULL; 1803 1804 reply(-211, "%s FTP server status:", hostname); 1805 reply(0, "Version: %s", EMPTYSTR(version) ? "<suppressed>" : version); 1806 ntop_buf[0] = '\0'; 1807 #ifdef NI_NUMERICHOST 1808 (void)getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1809 ntop_buf, sizeof(ntop_buf), NULL, 0, NI_NUMERICHOST); 1810 #else 1811 { 1812 struct hostent *hp; 1813 if ((hp = gethostbyaddr((const char *)&his_addr, 1814 his_addr.su_len, AF_INET)) != NULL) 1815 (void)strlcpy(ntop_buf, hp->h_name, sizeof(ntop_buf)); 1816 } 1817 #endif 1818 if (ntop_buf[0] != '\0' && strcmp(remotehost, ntop_buf) != 0) 1819 reply(0, "Connected to %s (%s)", remotehost, ntop_buf); 1820 else 1821 reply(0, "Connected to %s", remotehost); 1822 1823 if (logged_in) { 1824 if (curclass.type == CLASS_GUEST) 1825 reply(0, "Logged in anonymously"); 1826 else 1827 reply(0, "Logged in as %s%s", pw->pw_name, 1828 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 1829 } else if (askpasswd) 1830 reply(0, "Waiting for password"); 1831 else 1832 reply(0, "Waiting for user name"); 1833 cprintf(stdout, " TYPE: %s", typenames[type]); 1834 if (type == TYPE_A || type == TYPE_E) 1835 cprintf(stdout, ", FORM: %s", formnames[form]); 1836 if (type == TYPE_L) { 1837 #if NBBY == 8 1838 cprintf(stdout, " %d", NBBY); 1839 #else 1840 /* XXX: `bytesize' needs to be defined in this case */ 1841 cprintf(stdout, " %d", bytesize); 1842 #endif 1843 } 1844 cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n", 1845 strunames[stru], modenames[mode]); 1846 ispassive = 0; 1847 if (data != -1) { 1848 reply(0, "Data connection open"); 1849 su = NULL; 1850 } else if (pdata != -1) { 1851 reply(0, "in Passive mode"); 1852 su = (union sockunion *)&pasv_addr; 1853 ispassive = 1; 1854 goto printaddr; 1855 } else if (usedefault == 0) { 1856 if (epsvall) { 1857 reply(0, "EPSV only mode (EPSV ALL)"); 1858 goto epsvonly; 1859 } 1860 su = (union sockunion *)&data_dest; 1861 printaddr: 1862 /* PASV/PORT */ 1863 if (su->su_family == AF_INET) { 1864 a = (u_char *) &su->su_sin.sin_addr; 1865 p = (u_char *) &su->su_sin.sin_port; 1866 #define UC(b) (((int) b) & 0xff) 1867 reply(0, "%s (%d,%d,%d,%d,%d,%d)", 1868 ispassive ? "PASV" : "PORT" , 1869 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1870 UC(p[0]), UC(p[1])); 1871 } 1872 1873 /* LPSV/LPRT */ 1874 { 1875 int alen, af, i; 1876 1877 alen = 0; 1878 switch (su->su_family) { 1879 case AF_INET: 1880 a = (u_char *) &su->su_sin.sin_addr; 1881 p = (u_char *) &su->su_sin.sin_port; 1882 alen = sizeof(su->su_sin.sin_addr); 1883 af = 4; 1884 break; 1885 #ifdef INET6 1886 case AF_INET6: 1887 a = (u_char *) &su->su_sin6.sin6_addr; 1888 p = (u_char *) &su->su_sin6.sin6_port; 1889 alen = sizeof(su->su_sin6.sin6_addr); 1890 af = 6; 1891 break; 1892 #endif 1893 default: 1894 af = 0; 1895 break; 1896 } 1897 if (af) { 1898 cprintf(stdout, " %s (%d,%d", 1899 ispassive ? "LPSV" : "LPRT", af, alen); 1900 for (i = 0; i < alen; i++) 1901 cprintf(stdout, ",%d", UC(a[i])); 1902 cprintf(stdout, ",%d,%d,%d)", 2, UC(p[0]), UC(p[1])); 1903 #undef UC 1904 } 1905 } 1906 1907 /* EPRT/EPSV */ 1908 epsvonly: 1909 switch (su->su_family) { 1910 case AF_INET: 1911 af = 1; 1912 break; 1913 case AF_INET6: 1914 af = 2; 1915 break; 1916 default: 1917 af = 0; 1918 break; 1919 } 1920 ntop_buf[0] = '\0'; 1921 if (af) { 1922 #ifdef NI_NUMERICHOST 1923 (void)getnameinfo((struct sockaddr *)su, su->su_len, 1924 ntop_buf, sizeof(ntop_buf), NULL, 0, 1925 NI_NUMERICHOST); 1926 #else 1927 struct hostent *hp; 1928 1929 if ((hp = gethostbyaddr((const char *)su, 1930 su->su_len, AF_INET)) != NULL) 1931 (void)strlcpy(ntop_buf, hp->h_name, 1932 sizeof(ntop_buf)); 1933 #endif 1934 if (ntop_buf[0] != '\0') 1935 reply(0, "%s (|%d|%s|%d|)", 1936 ispassive ? "EPSV" : "EPRT", 1937 af, ntop_buf, ntohs(su->su_port)); 1938 } 1939 } else 1940 reply(0, "No data connection"); 1941 1942 if (logged_in) { 1943 reply(0, "Data sent: %qd byte%s in %qd file%s", 1944 (qdfmt_t)total_data_out, PLURAL(total_data_out), 1945 (qdfmt_t)total_files_out, PLURAL(total_files_out)); 1946 reply(0, "Data received: %qd byte%s in %qd file%s", 1947 (qdfmt_t)total_data_in, PLURAL(total_data_in), 1948 (qdfmt_t)total_files_in, PLURAL(total_files_in)); 1949 reply(0, "Total data: %qd byte%s in %qd file%s", 1950 (qdfmt_t)total_data, PLURAL(total_data), 1951 (qdfmt_t)total_files, PLURAL(total_files)); 1952 } 1953 otbi = total_bytes_in; 1954 otbo = total_bytes_out; 1955 otb = total_bytes; 1956 reply(0, "Traffic sent: %qd byte%s in %qd transfer%s", 1957 (qdfmt_t)otbo, PLURAL(otbo), 1958 (qdfmt_t)total_xfers_out, PLURAL(total_xfers_out)); 1959 reply(0, "Traffic received: %qd byte%s in %qd transfer%s", 1960 (qdfmt_t)otbi, PLURAL(otbi), 1961 (qdfmt_t)total_xfers_in, PLURAL(total_xfers_in)); 1962 reply(0, "Total traffic: %qd byte%s in %qd transfer%s", 1963 (qdfmt_t)otb, PLURAL(otb), 1964 (qdfmt_t)total_xfers, PLURAL(total_xfers)); 1965 1966 if (logged_in) { 1967 struct ftpconv *cp; 1968 1969 reply(0, "%s", ""); 1970 reply(0, "Class: %s, type: %s", 1971 curclass.classname, CURCLASSTYPE); 1972 reply(0, "Check PORT/LPRT commands: %sabled", 1973 curclass.checkportcmd ? "en" : "dis"); 1974 if (! EMPTYSTR(curclass.display)) 1975 reply(0, "Display file: %s", curclass.display); 1976 if (! EMPTYSTR(curclass.notify)) 1977 reply(0, "Notify fileglob: %s", curclass.notify); 1978 reply(0, "Idle timeout: %d, maximum timeout: %d", 1979 curclass.timeout, curclass.maxtimeout); 1980 reply(0, "Current connections: %d", connections); 1981 if (curclass.limit == -1) 1982 reply(0, "Maximum connections: unlimited"); 1983 else 1984 reply(0, "Maximum connections: %d", curclass.limit); 1985 if (curclass.limitfile) 1986 reply(0, "Connection limit exceeded file: %s", 1987 curclass.limitfile); 1988 if (! EMPTYSTR(curclass.chroot)) 1989 reply(0, "Chroot format: %s", curclass.chroot); 1990 if (! EMPTYSTR(curclass.homedir)) 1991 reply(0, "Homedir format: %s", curclass.homedir); 1992 if (! EMPTYSTR(curclass.motd)) 1993 reply(0, "MotD file: %s", curclass.motd); 1994 reply(0, 1995 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 1996 curclass.modify ? "en" : "dis"); 1997 reply(0, "Upload commands (APPE, STOR, STOU): %sabled", 1998 curclass.upload ? "en" : "dis"); 1999 if (curclass.portmin && curclass.portmax) 2000 reply(0, "PASV port range: %d - %d", 2001 curclass.portmin, curclass.portmax); 2002 if (curclass.rateget) 2003 reply(0, "Rate get limit: %d bytes/sec", 2004 curclass.rateget); 2005 else 2006 reply(0, "Rate get limit: disabled"); 2007 if (curclass.rateput) 2008 reply(0, "Rate put limit: %d bytes/sec", 2009 curclass.rateput); 2010 else 2011 reply(0, "Rate put limit: disabled"); 2012 reply(0, "Umask: %.04o", curclass.umask); 2013 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 2014 if (cp->suffix == NULL || cp->types == NULL || 2015 cp->command == NULL) 2016 continue; 2017 reply(0, "Conversion: %s [%s] disable: %s, command: %s", 2018 cp->suffix, cp->types, cp->disable, cp->command); 2019 } 2020 } 2021 2022 reply(211, "End of status"); 2023 } 2024 2025 void 2026 fatal(const char *s) 2027 { 2028 2029 reply(451, "Error in server: %s\n", s); 2030 reply(221, "Closing connection due to server error."); 2031 dologout(0); 2032 /* NOTREACHED */ 2033 } 2034 2035 /* 2036 * reply() -- 2037 * depending on the value of n, display fmt with a trailing CRLF and 2038 * prefix of: 2039 * n < -1 prefix the message with abs(n) + "-" (initial line) 2040 * n == 0 prefix the message with 4 spaces (middle lines) 2041 * n > 0 prefix the message with n + " " (final line) 2042 */ 2043 void 2044 reply(int n, const char *fmt, ...) 2045 { 2046 off_t b; 2047 va_list ap; 2048 2049 va_start(ap, fmt); 2050 b = 0; 2051 if (n == 0) 2052 cprintf(stdout, " "); 2053 else if (n < 0) 2054 cprintf(stdout, "%d-", -n); 2055 else 2056 cprintf(stdout, "%d ", n); 2057 b = vprintf(fmt, ap); 2058 total_bytes += b; 2059 total_bytes_out += b; 2060 cprintf(stdout, "\r\n"); 2061 (void)fflush(stdout); 2062 if (debug) { 2063 syslog(LOG_DEBUG, "<--- %d%c", abs(n), (n < 0) ? '-' : ' '); 2064 vsyslog(LOG_DEBUG, fmt, ap); 2065 } 2066 } 2067 2068 static void 2069 dolog(struct sockaddr *who) 2070 { 2071 #ifdef NI_MAXHOST 2072 (void)getnameinfo(who, who->sa_len, remotehost, sizeof(remotehost), 2073 NULL, 0, 0); 2074 #else 2075 struct hostent *hp; 2076 2077 if ((hp = gethostbyaddr((const char *)who, who->sa_len, 2078 AF_INET)) == NULL) 2079 strcpy(remotehost, 2080 inet_ntoa(((struct sockaddr_in *)who)->sin_addr)); 2081 #endif 2082 2083 #ifdef HASSETPROCTITLE 2084 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2085 setproctitle("%s", proctitle); 2086 #endif /* HASSETPROCTITLE */ 2087 if (logging) 2088 syslog(LOG_INFO, "connection from %s to %s", 2089 remotehost, hostname); 2090 } 2091 2092 /* 2093 * Record logout in wtmp file 2094 * and exit with supplied status. 2095 */ 2096 void 2097 dologout(int status) 2098 { 2099 /* 2100 * Prevent reception of SIGURG from resulting in a resumption 2101 * back to the main program loop. 2102 */ 2103 transflag = 0; 2104 2105 if (logged_in) { 2106 if (dowtmp) 2107 logwtmp(ttyline, "", ""); 2108 if (doutmp) 2109 logout(utmp.ut_line); 2110 #ifdef KERBEROS 2111 if (!notickets && krbtkfile_env) 2112 unlink(krbtkfile_env); 2113 #endif 2114 } 2115 /* beware of flushing buffers after a SIGPIPE */ 2116 _exit(status); 2117 } 2118 2119 static void 2120 myoob(int signo) 2121 { 2122 char *cp; 2123 2124 /* only process if transfer occurring */ 2125 if (!transflag) 2126 return; 2127 cp = tmpline; 2128 if (getline(cp, 7, stdin) == NULL) { 2129 reply(221, "You could at least say goodbye."); 2130 dologout(0); 2131 } 2132 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2133 tmpline[0] = '\0'; 2134 reply(426, "Transfer aborted. Data connection closed."); 2135 reply(226, "Abort successful"); 2136 longjmp(urgcatch, 1); 2137 } 2138 if (strcasecmp(cp, "STAT\r\n") == 0) { 2139 tmpline[0] = '\0'; 2140 if (file_size != (off_t) -1) 2141 reply(213, "Status: %qd of %qd byte%s transferred", 2142 (qdfmt_t)byte_count, (qdfmt_t)file_size, 2143 PLURAL(byte_count)); 2144 else 2145 reply(213, "Status: %qd byte%s transferred", 2146 (qdfmt_t)byte_count, PLURAL(byte_count)); 2147 } 2148 } 2149 2150 static int 2151 bind_pasv_addr(void) 2152 { 2153 static int passiveport; 2154 int port, len; 2155 2156 len = pasv_addr.su_len; 2157 if (curclass.portmin == 0 && curclass.portmax == 0) { 2158 pasv_addr.su_port = 0; 2159 return (bind(pdata, (struct sockaddr *)&pasv_addr, len)); 2160 } 2161 2162 if (passiveport == 0) { 2163 srand(getpid()); 2164 passiveport = rand() % (curclass.portmax - curclass.portmin) 2165 + curclass.portmin; 2166 } 2167 2168 port = passiveport; 2169 while (1) { 2170 port++; 2171 if (port > curclass.portmax) 2172 port = curclass.portmin; 2173 else if (port == passiveport) { 2174 errno = EAGAIN; 2175 return (-1); 2176 } 2177 pasv_addr.su_port = htons(port); 2178 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) == 0) 2179 break; 2180 if (errno != EADDRINUSE) 2181 return (-1); 2182 } 2183 passiveport = port; 2184 return (0); 2185 } 2186 2187 /* 2188 * Note: a response of 425 is not mentioned as a possible response to 2189 * the PASV command in RFC959. However, it has been blessed as 2190 * a legitimate response by Jon Postel in a telephone conversation 2191 * with Rick Adams on 25 Jan 89. 2192 */ 2193 void 2194 passive(void) 2195 { 2196 int len; 2197 char *p, *a; 2198 2199 if (pdata >= 0) 2200 close(pdata); 2201 pdata = socket(AF_INET, SOCK_STREAM, 0); 2202 if (pdata < 0 || !logged_in) { 2203 perror_reply(425, "Can't open passive connection"); 2204 return; 2205 } 2206 pasv_addr = ctrl_addr; 2207 2208 if (bind_pasv_addr() < 0) 2209 goto pasv_error; 2210 len = pasv_addr.su_len; 2211 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2212 goto pasv_error; 2213 if (listen(pdata, 1) < 0) 2214 goto pasv_error; 2215 a = (char *) &pasv_addr.su_sin.sin_addr; 2216 p = (char *) &pasv_addr.su_port; 2217 2218 #define UC(b) (((int) b) & 0xff) 2219 2220 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2221 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2222 return; 2223 2224 pasv_error: 2225 (void) close(pdata); 2226 pdata = -1; 2227 perror_reply(425, "Can't open passive connection"); 2228 return; 2229 } 2230 2231 /* 2232 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2233 * 229 Entering Extended Passive Mode (|||port|) 2234 */ 2235 void 2236 long_passive(char *cmd, int pf) 2237 { 2238 int len; 2239 char *p, *a; 2240 2241 if (!logged_in) { 2242 syslog(LOG_NOTICE, "long passive but not logged in"); 2243 reply(503, "Login with USER first."); 2244 return; 2245 } 2246 2247 if (pf != PF_UNSPEC) { 2248 if (ctrl_addr.su_family != pf) { 2249 switch (ctrl_addr.su_family) { 2250 case AF_INET: 2251 pf = 1; 2252 break; 2253 case AF_INET6: 2254 pf = 2; 2255 break; 2256 default: 2257 pf = 0; 2258 break; 2259 } 2260 /* 2261 * XXX 2262 * only EPRT/EPSV ready clients will understand this 2263 */ 2264 if (strcmp(cmd, "EPSV") == 0 && pf) { 2265 reply(522, "Network protocol mismatch, " 2266 "use (%d)", pf); 2267 } else 2268 reply(501, "Network protocol mismatch"); /*XXX*/ 2269 2270 return; 2271 } 2272 } 2273 2274 if (pdata >= 0) 2275 close(pdata); 2276 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2277 if (pdata < 0) { 2278 perror_reply(425, "Can't open passive connection"); 2279 return; 2280 } 2281 pasv_addr = ctrl_addr; 2282 if (bind_pasv_addr() < 0) 2283 goto pasv_error; 2284 len = pasv_addr.su_len; 2285 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2286 goto pasv_error; 2287 if (listen(pdata, 1) < 0) 2288 goto pasv_error; 2289 p = (char *) &pasv_addr.su_port; 2290 2291 #define UC(b) (((int) b) & 0xff) 2292 2293 if (strcmp(cmd, "LPSV") == 0) { 2294 switch (pasv_addr.su_family) { 2295 case AF_INET: 2296 a = (char *) &pasv_addr.su_sin.sin_addr; 2297 reply(228, "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2298 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2299 2, UC(p[0]), UC(p[1])); 2300 return; 2301 #ifdef INET6 2302 case AF_INET6: 2303 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2304 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)", 2305 6, 16, 2306 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2307 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2308 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2309 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2310 2, UC(p[0]), UC(p[1])); 2311 return; 2312 #endif 2313 } 2314 #undef UC 2315 } else if (strcmp(cmd, "EPSV") == 0) { 2316 switch (pasv_addr.su_family) { 2317 case AF_INET: 2318 case AF_INET6: 2319 reply(229, "Entering Extended Passive Mode (|||%d|)", 2320 ntohs(pasv_addr.su_port)); 2321 return; 2322 } 2323 } else { 2324 /* more proper error code? */ 2325 } 2326 2327 pasv_error: 2328 (void) close(pdata); 2329 pdata = -1; 2330 perror_reply(425, "Can't open passive connection"); 2331 return; 2332 } 2333 2334 /* 2335 * Generate unique name for file with basename "local". 2336 * The file named "local" is already known to exist. 2337 * Generates failure reply on error. 2338 * 2339 * XXX this function should under go changes similar to 2340 * the mktemp(3)/mkstemp(3) changes. 2341 */ 2342 static char * 2343 gunique(const char *local) 2344 { 2345 static char new[MAXPATHLEN]; 2346 struct stat st; 2347 char *cp; 2348 int count; 2349 2350 cp = strrchr(local, '/'); 2351 if (cp) 2352 *cp = '\0'; 2353 if (stat(cp ? local : ".", &st) < 0) { 2354 perror_reply(553, cp ? local : "."); 2355 return (NULL); 2356 } 2357 if (cp) 2358 *cp = '/'; 2359 for (count = 1; count < 100; count++) { 2360 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2361 if (stat(new, &st) < 0) 2362 return (new); 2363 } 2364 reply(452, "Unique file name cannot be created."); 2365 return (NULL); 2366 } 2367 2368 /* 2369 * Format and send reply containing system error number. 2370 */ 2371 void 2372 perror_reply(int code, const char *string) 2373 { 2374 int save_errno; 2375 2376 save_errno = errno; 2377 reply(code, "%s: %s.", string, strerror(errno)); 2378 errno = save_errno; 2379 } 2380 2381 static char *onefile[] = { 2382 "", 2383 0 2384 }; 2385 2386 void 2387 send_file_list(const char *whichf) 2388 { 2389 struct stat st; 2390 DIR *dirp = NULL; 2391 struct dirent *dir; 2392 FILE *dout = NULL; 2393 char **dirlist, *dirname, *p; 2394 int simple = 0; 2395 int freeglob = 0; 2396 glob_t gl; 2397 off_t b; 2398 2399 #ifdef __GNUC__ 2400 (void) &dout; 2401 (void) &dirlist; 2402 (void) &simple; 2403 (void) &freeglob; 2404 #endif 2405 2406 p = NULL; 2407 if (strpbrk(whichf, "~{[*?") != NULL) { 2408 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2409 2410 memset(&gl, 0, sizeof(gl)); 2411 freeglob = 1; 2412 if (glob(whichf, flags, 0, &gl)) { 2413 reply(550, "not found"); 2414 goto out; 2415 } else if (gl.gl_pathc == 0) { 2416 errno = ENOENT; 2417 perror_reply(550, whichf); 2418 goto out; 2419 } 2420 dirlist = gl.gl_pathv; 2421 } else { 2422 p = xstrdup(whichf); 2423 onefile[0] = p; 2424 dirlist = onefile; 2425 simple = 1; 2426 } 2427 /* XXX: } for vi sm */ 2428 2429 if (setjmp(urgcatch)) { 2430 transflag = 0; 2431 goto out; 2432 } 2433 while ((dirname = *dirlist++) != NULL) { 2434 int trailingslash = 0; 2435 2436 if (stat(dirname, &st) < 0) { 2437 /* 2438 * If user typed "ls -l", etc, and the client 2439 * used NLST, do what the user meant. 2440 */ 2441 /* XXX: nuke this support? */ 2442 if (dirname[0] == '-' && *dirlist == NULL && 2443 transflag == 0) { 2444 char *argv[] = { INTERNAL_LS, "", NULL }; 2445 2446 argv[1] = dirname; 2447 retrieve(argv, dirname); 2448 goto out; 2449 } 2450 perror_reply(550, whichf); 2451 goto cleanup_send_file_list; 2452 } 2453 2454 if (S_ISREG(st.st_mode)) { 2455 if (dout == NULL) { 2456 dout = dataconn("file list", (off_t)-1, "w"); 2457 if (dout == NULL) 2458 goto out; 2459 transflag++; 2460 } 2461 b = fprintf(dout, "%s%s\n", dirname, 2462 type == TYPE_A ? "\r" : ""); 2463 total_bytes += b; 2464 total_bytes_out += b; 2465 byte_count += strlen(dirname) + 1; 2466 continue; 2467 } else if (!S_ISDIR(st.st_mode)) 2468 continue; 2469 2470 if (dirname[strlen(dirname) - 1] == '/') 2471 trailingslash++; 2472 2473 if ((dirp = opendir(dirname)) == NULL) 2474 continue; 2475 2476 while ((dir = readdir(dirp)) != NULL) { 2477 char nbuf[MAXPATHLEN]; 2478 2479 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 2480 continue; 2481 2482 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2483 trailingslash ? "" : "/", dir->d_name); 2484 2485 /* 2486 * We have to do a stat to ensure it's 2487 * not a directory or special file. 2488 */ 2489 /* XXX: follow RFC959 and filter out non files ? */ 2490 if (simple || (stat(nbuf, &st) == 0 && 2491 S_ISREG(st.st_mode))) { 2492 char *p; 2493 2494 if (dout == NULL) { 2495 dout = dataconn("file list", (off_t)-1, 2496 "w"); 2497 if (dout == NULL) 2498 goto out; 2499 transflag++; 2500 } 2501 p = nbuf; 2502 if (nbuf[0] == '.' && nbuf[1] == '/') 2503 p = &nbuf[2]; 2504 b = fprintf(dout, "%s%s\n", p, 2505 type == TYPE_A ? "\r" : ""); 2506 total_bytes += b; 2507 total_bytes_out += b; 2508 byte_count += strlen(nbuf) + 1; 2509 } 2510 } 2511 (void) closedir(dirp); 2512 } 2513 2514 if (dout == NULL) 2515 reply(550, "No files found."); 2516 else if (ferror(dout) != 0) 2517 perror_reply(550, "Data connection"); 2518 else 2519 reply(226, "Transfer complete."); 2520 2521 cleanup_send_file_list: 2522 transflag = 0; 2523 closedataconn(dout); 2524 out: 2525 total_xfers++; 2526 total_xfers_out++; 2527 if (p) 2528 free(p); 2529 if (freeglob) 2530 globfree(&gl); 2531 } 2532 2533 char * 2534 conffilename(const char *s) 2535 { 2536 static char filename[MAXPATHLEN]; 2537 2538 if (*s == '/') 2539 strlcpy(filename, s, sizeof(filename)); 2540 else 2541 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2542 return (filename); 2543 } 2544 2545 /* 2546 * logcmd -- 2547 * based on the arguments, syslog a message: 2548 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2549 * else if file2 != NULL "<command> <file1> <file2>" 2550 * else "<command> <file1>" 2551 * if elapsed != NULL, append "in xxx.yyy seconds" 2552 * if error != NULL, append ": " + error 2553 */ 2554 void 2555 logcmd(const char *command, off_t bytes, const char *file1, const char *file2, 2556 const struct timeval *elapsed, const char *error) 2557 { 2558 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN]; 2559 const char *p; 2560 size_t len; 2561 2562 if (logging <=1) 2563 return; 2564 2565 if ((p = realpath(file1, realfile)) == NULL) { 2566 #if 0 /* XXX: too noisy */ 2567 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2568 realfile, strerror(errno)); 2569 #endif 2570 p = file1; 2571 } 2572 len = snprintf(buf, sizeof(buf), "%s %s", command, p); 2573 2574 if (bytes != (off_t)-1) { 2575 len += snprintf(buf + len, sizeof(buf) - len, 2576 " = %qd byte%s", (qdfmt_t) bytes, PLURAL(bytes)); 2577 } else if (file2 != NULL) { 2578 if ((p = realpath(file2, realfile)) == NULL) { 2579 #if 0 /* XXX: too noisy */ 2580 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2581 realfile, strerror(errno)); 2582 #endif 2583 p = file2; 2584 } 2585 len += snprintf(buf + len, sizeof(buf) - len, " %s", p); 2586 } 2587 2588 if (elapsed != NULL) { 2589 len += snprintf(buf + len, sizeof(buf) - len, 2590 " in %ld.%.03d seconds", elapsed->tv_sec, 2591 (int)(elapsed->tv_usec / 1000)); 2592 } 2593 2594 if (error != NULL) 2595 len += snprintf(buf + len, sizeof(buf) - len, ": %s", error); 2596 2597 syslog(LOG_INFO, "%s", buf); 2598 } 2599 2600 char * 2601 xstrdup(const char *s) 2602 { 2603 char *new = strdup(s); 2604 2605 if (new == NULL) 2606 fatal("Local resource failure: malloc"); 2607 /* NOTREACHED */ 2608 return (new); 2609 } 2610 2611 /* 2612 * As per fprintf(), but increment total_bytes and total_bytes_out, 2613 * by the appropriate amount. 2614 */ 2615 void 2616 cprintf(FILE *fd, const char *fmt, ...) 2617 { 2618 off_t b; 2619 va_list ap; 2620 2621 va_start(ap, fmt); 2622 b = vfprintf(fd, fmt, ap); 2623 total_bytes += b; 2624 total_bytes_out += b; 2625 } 2626
Indexes created Tue Oct 14 08:09:56 GMT 2025