ftpd.c revision 1.99
1 /* $NetBSD: ftpd.c,v 1.99 2000/07/15 03:45:20 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 1.99 2000/07/15 03:45:20 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 = 0; /* update utmp file */ 176 int mapped = 0; /* IPv4 connection on AF_INET6 socket */ 177 off_t file_size; 178 off_t byte_count; 179 static char ttyline[20]; 180 static struct utmp utmp; /* for utmp */ 181 182 static char *anondir = NULL; 183 static char confdir[MAXPATHLEN]; 184 185 #if defined(KERBEROS) || defined(KERBEROS5) 186 int has_ccache = 0; 187 int notickets = 1; 188 char *krbtkfile_env = NULL; 189 char *tty = ttyline; 190 int login_krb5_forwardable_tgt = 0; 191 #endif 192 193 int epsvall = 0; 194 195 /* 196 * Timeout intervals for retrying connections 197 * to hosts that don't accept PORT cmds. This 198 * is a kludge, but given the problems with TCP... 199 */ 200 #define SWAITMAX 90 /* wait at most 90 seconds */ 201 #define SWAITINT 5 /* interval between retries */ 202 203 int swaitmax = SWAITMAX; 204 int swaitint = SWAITINT; 205 206 static int bind_pasv_addr(void); 207 static int checkuser(const char *, const char *, int, int, char **); 208 static int checkaccess(const char *); 209 static void dolog(struct sockaddr *); 210 static void end_login(void); 211 static FILE *getdatasock(const char *); 212 static char *gunique(const char *); 213 static void lostconn(int); 214 static void myoob(int); 215 static int receive_data(FILE *, FILE *); 216 static int send_data(FILE *, FILE *, off_t, int); 217 static struct passwd *sgetpwnam(const char *); 218 219 int main(int, char *[]); 220 221 #if defined(KERBEROS) 222 int klogin(struct passwd *, char *, char *, char *); 223 void kdestroy(void); 224 #endif 225 #if defined(KERBEROS5) 226 int k5login(struct passwd *, char *, char *, char *); 227 void k5destroy(void); 228 #endif 229 230 int 231 main(int argc, char *argv[]) 232 { 233 int addrlen, ch, on = 1, tos, keepalive; 234 #ifdef KERBEROS5 235 krb5_error_code kerror; 236 #endif 237 238 connections = 1; 239 debug = 0; 240 logging = 0; 241 pdata = -1; 242 sflag = 0; 243 usedefault = 1; 244 (void)strcpy(confdir, _DEFAULT_CONFDIR); 245 hostname[0] = '\0'; 246 gidcount = 0; 247 248 while ((ch = getopt(argc, argv, "a:c:C:dh:Hlst:T:u:Uv")) != -1) { 249 switch (ch) { 250 case 'a': 251 anondir = optarg; 252 break; 253 254 case 'c': 255 (void)strlcpy(confdir, optarg, sizeof(confdir)); 256 break; 257 258 case 'C': 259 pw = sgetpwnam(optarg); 260 exit(checkaccess(optarg) ? 0 : 1); 261 /* NOTREACHED */ 262 263 case 'd': 264 case 'v': /* deprecated */ 265 debug = 1; 266 break; 267 268 case 'h': 269 strlcpy(hostname, optarg, sizeof(hostname)); 270 break; 271 272 case 'H': 273 if (gethostname(hostname, sizeof(hostname)) == -1) 274 hostname[0] = '\0'; 275 hostname[sizeof(hostname) - 1] = '\0'; 276 break; 277 278 case 'l': 279 logging++; /* > 1 == extra logging */ 280 break; 281 282 case 's': 283 sflag = 1; 284 break; 285 286 case 't': 287 case 'T': 288 case 'u': 289 warnx("-%c has been deprecated in favour of ftpd.conf", 290 ch); 291 break; 292 293 case 'U': 294 doutmp = 1; 295 break; 296 297 default: 298 if (optopt == 'a' || optopt == 'C') 299 exit(1); 300 warnx("unknown flag -%c ignored", optopt); 301 break; 302 } 303 } 304 305 /* 306 * LOG_NDELAY sets up the logging connection immediately, 307 * necessary for anonymous ftp's that chroot and can't do it later. 308 */ 309 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 310 addrlen = sizeof(his_addr); /* xxx */ 311 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 312 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 313 exit(1); 314 } 315 addrlen = sizeof(ctrl_addr); 316 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 317 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 318 exit(1); 319 } 320 if (his_addr.su_family == AF_INET6 321 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 322 #if 1 323 /* 324 * IPv4 control connection arrived to AF_INET6 socket. 325 * I hate to do this, but this is the easiest solution. 326 * 327 * The assumption is untrue on SIIT environment. 328 */ 329 union sockunion tmp_addr; 330 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 331 332 tmp_addr = his_addr; 333 memset(&his_addr, 0, sizeof(his_addr)); 334 his_addr.su_sin.sin_family = AF_INET; 335 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 336 memcpy(&his_addr.su_sin.sin_addr, 337 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 338 sizeof(his_addr.su_sin.sin_addr)); 339 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 340 341 tmp_addr = ctrl_addr; 342 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 343 ctrl_addr.su_sin.sin_family = AF_INET; 344 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 345 memcpy(&ctrl_addr.su_sin.sin_addr, 346 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 347 sizeof(ctrl_addr.su_sin.sin_addr)); 348 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 349 #else 350 while (fgets(line, sizeof(line), fd) != NULL) { 351 if ((cp = strchr(line, '\n')) != NULL) 352 *cp = '\0'; 353 reply(-530, "%s", line); 354 } 355 (void) fflush(stdout); 356 (void) fclose(fd); 357 reply(530, 358 "Connection from IPv4 mapped address is not supported."); 359 exit(0); 360 #endif 361 362 mapped = 1; 363 } else 364 mapped = 0; 365 #ifdef IP_TOS 366 if (!mapped && his_addr.su_family == AF_INET) { 367 tos = IPTOS_LOWDELAY; 368 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 369 sizeof(int)) < 0) 370 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 371 } 372 #endif 373 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 374 375 /* if the hostname hasn't been given, attempt to determine it */ 376 if (hostname[0] == '\0') { 377 if (getnameinfo((struct sockaddr *)&ctrl_addr, ctrl_addr.su_len, 378 hostname, sizeof(hostname), NULL, 0, 0) != 0) 379 (void)gethostname(hostname, sizeof(hostname)); 380 hostname[sizeof(hostname) - 1] = '\0'; 381 } 382 383 /* set this here so klogin can use it... */ 384 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 385 386 (void) freopen(_PATH_DEVNULL, "w", stderr); 387 (void) signal(SIGPIPE, lostconn); 388 (void) signal(SIGCHLD, SIG_IGN); 389 if (signal(SIGURG, myoob) == SIG_ERR) 390 syslog(LOG_ERR, "signal: %m"); 391 392 /* Try to handle urgent data inline */ 393 #ifdef SO_OOBINLINE 394 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 395 syslog(LOG_ERR, "setsockopt: %m"); 396 #endif 397 /* Set keepalives on the socket to detect dropped connections. */ 398 #ifdef SO_KEEPALIVE 399 keepalive = 1; 400 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 401 sizeof(int)) < 0) 402 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 403 #endif 404 405 #ifdef F_SETOWN 406 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 407 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 408 #endif 409 dolog((struct sockaddr *)&his_addr); 410 /* 411 * Set up default state 412 */ 413 data = -1; 414 type = TYPE_A; 415 form = FORM_N; 416 stru = STRU_F; 417 mode = MODE_S; 418 tmpline[0] = '\0'; 419 hasyyerrored = 0; 420 421 #ifdef KERBEROS5 422 kerror = krb5_init_context(&kcontext); 423 if (kerror) { 424 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 425 error_message(kerror)); 426 exit(0); 427 } 428 #endif /* KERBEROS5 */ 429 430 init_curclass(); 431 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 432 curclass.type = CLASS_REAL; 433 434 /* If logins are disabled, print out the message. */ 435 if (format_file(_PATH_NOLOGIN, 530)) { 436 reply(530, "System not available."); 437 exit(0); 438 } 439 (void)format_file(conffilename(_PATH_FTPWELCOME), 220); 440 /* reply(220,) must follow */ 441 reply(220, "%s FTP server (%s) ready.", hostname, FTPD_VERSION); 442 443 (void) setjmp(errcatch); 444 for (;;) 445 (void) yyparse(); 446 /* NOTREACHED */ 447 } 448 449 static void 450 lostconn(int signo) 451 { 452 453 if (debug) 454 syslog(LOG_DEBUG, "lost connection"); 455 dologout(1); 456 } 457 458 /* 459 * Save the result of a getpwnam. Used for USER command, since 460 * the data returned must not be clobbered by any other command 461 * (e.g., globbing). 462 */ 463 static struct passwd * 464 sgetpwnam(const char *name) 465 { 466 static struct passwd save; 467 struct passwd *p; 468 469 if ((p = getpwnam(name)) == NULL) 470 return (p); 471 if (save.pw_name) { 472 free((char *)save.pw_name); 473 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 474 free((char *)save.pw_passwd); 475 free((char *)save.pw_gecos); 476 free((char *)save.pw_dir); 477 free((char *)save.pw_shell); 478 } 479 save = *p; 480 save.pw_name = xstrdup(p->pw_name); 481 save.pw_passwd = xstrdup(p->pw_passwd); 482 save.pw_gecos = xstrdup(p->pw_gecos); 483 save.pw_dir = xstrdup(p->pw_dir); 484 save.pw_shell = xstrdup(p->pw_shell); 485 return (&save); 486 } 487 488 static int login_attempts; /* number of failed login attempts */ 489 static int askpasswd; /* had user command, ask for passwd */ 490 static char curname[10]; /* current USER name */ 491 492 /* 493 * USER command. 494 * Sets global passwd pointer pw if named account exists and is acceptable; 495 * sets askpasswd if a PASS command is expected. If logged in previously, 496 * need to reset state. If name is "ftp" or "anonymous", the name is not in 497 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 498 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 499 * requesting login privileges. Disallow anyone who does not have a standard 500 * shell as returned by getusershell(). Disallow anyone mentioned in the file 501 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 502 */ 503 void 504 user(const char *name) 505 { 506 if (logged_in) { 507 switch (curclass.type) { 508 case CLASS_GUEST: 509 reply(530, "Can't change user from guest login."); 510 return; 511 case CLASS_CHROOT: 512 reply(530, "Can't change user from chroot user."); 513 return; 514 case CLASS_REAL: 515 end_login(); 516 break; 517 default: 518 abort(); 519 } 520 } 521 522 #if defined(KERBEROS) 523 kdestroy(); 524 #endif 525 #if defined(KERBEROS5) 526 k5destroy(); 527 #endif 528 529 curclass.type = CLASS_REAL; 530 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 531 /* need `pw' setup for checkaccess() and checkuser () */ 532 if ((pw = sgetpwnam("ftp")) == NULL) 533 reply(530, "User %s unknown.", name); 534 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 535 reply(530, "User %s access denied.", name); 536 else { 537 curclass.type = CLASS_GUEST; 538 askpasswd = 1; 539 reply(331, 540 "Guest login ok, type your name as password."); 541 } 542 if (!askpasswd && logging) 543 syslog(LOG_NOTICE, 544 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 545 return; 546 } 547 548 pw = sgetpwnam(name); 549 if (logging) 550 strlcpy(curname, name, sizeof(curname)); 551 552 #ifdef SKEY 553 if (skey_haskey(name) == 0) { 554 char *myskey; 555 556 myskey = skey_keyinfo(name); 557 reply(331, "Password [%s] required for %s.", 558 myskey ? myskey : "error getting challenge", name); 559 } else 560 #endif 561 reply(331, "Password required for %s.", name); 562 563 askpasswd = 1; 564 /* 565 * Delay before reading passwd after first failed 566 * attempt to slow down passwd-guessing programs. 567 */ 568 if (login_attempts) 569 sleep((unsigned) login_attempts); 570 } 571 572 /* 573 * Determine whether something is to happen (allow access, chroot) 574 * for a user. Each line is a shell-style glob followed by 575 * `yes' or `no'. 576 * 577 * For backward compatability, `allow' and `deny' are synonymns 578 * for `yes' and `no', respectively. 579 * 580 * Each glob is matched against the username in turn, and the first 581 * match found is used. If no match is found, the result is the 582 * argument `def'. If a match is found but without and explicit 583 * `yes'/`no', the result is the opposite of def. 584 * 585 * If the file doesn't exist at all, the result is the argument 586 * `nofile' 587 * 588 * Any line starting with `#' is considered a comment and ignored. 589 * 590 * Returns 0 if the user is denied, or 1 if they are allowed. 591 * 592 * NOTE: needs struct passwd *pw setup before use. 593 */ 594 int 595 checkuser(const char *fname, const char *name, int def, int nofile, 596 char **retclass) 597 { 598 FILE *fd; 599 int retval; 600 char *glob, *perm, *class, *buf, *p; 601 size_t len, line; 602 603 retval = def; 604 if (retclass != NULL) 605 *retclass = NULL; 606 if ((fd = fopen(conffilename(fname), "r")) == NULL) 607 return nofile; 608 609 line = 0; 610 for (; 611 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 612 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 613 free(buf), buf = NULL) { 614 glob = perm = class = NULL; 615 p = buf; 616 if (len < 1) 617 continue; 618 if (p[len - 1] == '\n') 619 p[--len] = '\0'; 620 if (EMPTYSTR(p)) 621 continue; 622 623 NEXTWORD(p, glob); 624 NEXTWORD(p, perm); 625 NEXTWORD(p, class); 626 if (EMPTYSTR(glob)) 627 continue; 628 if (!EMPTYSTR(class)) { 629 if (strcasecmp(class, "all") == 0 || 630 strcasecmp(class, "none") == 0) { 631 syslog(LOG_WARNING, 632 "%s line %d: illegal user-defined class `%s' - skipping entry", 633 fname, (int)line, class); 634 continue; 635 } 636 } 637 638 /* have a host specifier */ 639 if ((p = strchr(glob, '@')) != NULL) { 640 u_int32_t net, mask, addr; 641 int bits; 642 643 *p++ = '\0'; 644 /* check against network or CIDR */ 645 if (isdigit(*p) && 646 (bits = inet_net_pton(AF_INET, p, 647 &net, sizeof(net))) != -1) { 648 net = ntohl(net); 649 mask = 0xffffffffU << (32 - bits); 650 addr = ntohl(his_addr.su_sin.sin_addr.s_addr); 651 if ((addr & mask) != net) 652 continue; 653 654 /* check against hostname glob */ 655 } else if (fnmatch(p, remotehost, 0) != 0) 656 continue; 657 } 658 659 /* have a group specifier */ 660 if ((p = strchr(glob, ':')) != NULL) { 661 gid_t *groups, *ng; 662 int gsize, i, found; 663 664 *p++ = '\0'; 665 groups = NULL; 666 gsize = 16; 667 do { 668 ng = realloc(groups, gsize * sizeof(gid_t)); 669 if (ng == NULL) 670 fatal( 671 "Local resource failure: realloc"); 672 groups = ng; 673 } while (getgrouplist(pw->pw_name, pw->pw_gid, 674 groups, &gsize) == -1); 675 found = 0; 676 for (i = 0; i < gsize; i++) { 677 struct group *g; 678 679 if ((g = getgrgid(groups[i])) == NULL) 680 continue; 681 if (fnmatch(p, g->gr_name, 0) == 0) { 682 found = 1; 683 break; 684 } 685 } 686 free(groups); 687 if (!found) 688 continue; 689 } 690 691 /* check against username glob */ 692 if (fnmatch(glob, name, 0) != 0) 693 continue; 694 695 if (perm != NULL && 696 ((strcasecmp(perm, "allow") == 0) || 697 (strcasecmp(perm, "yes") == 0))) 698 retval = 1; 699 else if (perm != NULL && 700 ((strcasecmp(perm, "deny") == 0) || 701 (strcasecmp(perm, "no") == 0))) 702 retval = 0; 703 else 704 retval = !def; 705 if (!EMPTYSTR(class) && retclass != NULL) 706 *retclass = xstrdup(class); 707 free(buf); 708 break; 709 } 710 (void) fclose(fd); 711 return (retval); 712 } 713 714 /* 715 * Check if user is allowed by /etc/ftpusers 716 * returns 1 for yes, 0 for no 717 * 718 * NOTE: needs struct passwd *pw setup (for checkuser()) 719 */ 720 int 721 checkaccess(const char *name) 722 { 723 724 return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL)); 725 } 726 727 /* 728 * Terminate login as previous user, if any, resetting state; 729 * used when USER command is given or login fails. 730 */ 731 static void 732 end_login(void) 733 { 734 735 (void) seteuid((uid_t)0); 736 if (logged_in) { 737 logwtmp(ttyline, "", ""); 738 if (doutmp) 739 logout(utmp.ut_line); 740 } 741 pw = NULL; 742 logged_in = 0; 743 quietmessages = 0; 744 gidcount = 0; 745 curclass.type = CLASS_REAL; 746 } 747 748 void 749 pass(const char *passwd) 750 { 751 int rval; 752 const char *cp, *shell, *home; 753 char *class; 754 755 class = NULL; 756 if (logged_in || askpasswd == 0) { 757 reply(503, "Login with USER first."); 758 return; 759 } 760 askpasswd = 0; 761 if (curclass.type != CLASS_GUEST) { 762 /* "ftp" is only account allowed no password */ 763 if (pw == NULL) { 764 rval = 1; /* failure below */ 765 goto skip; 766 } 767 #if defined(KERBEROS) 768 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 769 rval = 0; 770 goto skip; 771 } 772 #endif 773 #if defined(KERBEROS5) 774 if (k5login(pw, "", hostname, (char *)passwd) == 0) { 775 rval = 0; 776 goto skip; 777 } 778 #endif 779 #ifdef SKEY 780 if (skey_haskey(pw->pw_name) == 0) { 781 char *p; 782 int r; 783 784 p = xstrdup(passwd); 785 r = skey_passcheck(pw->pw_name, p); 786 free(p); 787 if (r != -1) { 788 rval = 0; 789 goto skip; 790 } 791 } 792 #endif 793 if (!sflag && *pw->pw_passwd != '\0' && 794 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 795 rval = 0; 796 goto skip; 797 } 798 rval = 1; 799 800 skip: 801 if (pw != NULL && pw->pw_expire && time(NULL) >= pw->pw_expire) 802 rval = 2; 803 /* 804 * If rval > 0, the user failed the authentication check 805 * above. If rval == 0, either Kerberos or local authentication 806 * succeeded. 807 */ 808 if (rval) { 809 reply(530, "%s", rval == 2 ? "Password expired." : 810 "Login incorrect."); 811 if (logging) { 812 syslog(LOG_NOTICE, 813 "FTP LOGIN FAILED FROM %s", remotehost); 814 syslog(LOG_AUTHPRIV | LOG_NOTICE, 815 "FTP LOGIN FAILED FROM %s, %s", 816 remotehost, curname); 817 } 818 pw = NULL; 819 if (login_attempts++ >= 5) { 820 syslog(LOG_NOTICE, 821 "repeated login failures from %s", 822 remotehost); 823 exit(0); 824 } 825 return; 826 } 827 } 828 829 /* password was ok; see if anything else prevents login */ 830 if (! checkuser(_PATH_FTPUSERS, pw->pw_name, 1, 0, &class)) { 831 reply(530, "User %s may not use FTP.", pw->pw_name); 832 if (logging) 833 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 834 remotehost, pw->pw_name); 835 goto bad; 836 } 837 /* check for valid shell, if not guest user */ 838 if ((shell = pw->pw_shell) == NULL || *shell == 0) 839 shell = _PATH_BSHELL; 840 while ((cp = getusershell()) != NULL) 841 if (strcmp(cp, shell) == 0) 842 break; 843 endusershell(); 844 if (cp == NULL && curclass.type != CLASS_GUEST) { 845 reply(530, "User %s may not use FTP.", pw->pw_name); 846 if (logging) 847 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 848 remotehost, pw->pw_name); 849 goto bad; 850 } 851 852 login_attempts = 0; /* this time successful */ 853 if (setegid((gid_t)pw->pw_gid) < 0) { 854 reply(550, "Can't set gid."); 855 goto bad; 856 } 857 (void) initgroups(pw->pw_name, pw->pw_gid); 858 gidcount = getgroups(sizeof(gidlist), gidlist); 859 860 /* open wtmp before chroot */ 861 logwtmp(ttyline, pw->pw_name, remotehost); 862 863 /* open utmp before chroot */ 864 if (doutmp) { 865 memset((void *)&utmp, 0, sizeof(utmp)); 866 (void)time(&utmp.ut_time); 867 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 868 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 869 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 870 login(&utmp); 871 } 872 873 logged_in = 1; 874 875 /* check user in /etc/ftpchroot */ 876 if (checkuser(_PATH_FTPCHROOT, pw->pw_name, 0, 0, NULL)) { 877 if (curclass.type == CLASS_GUEST) { 878 syslog(LOG_NOTICE, 879 "Can't change guest user to chroot class; remove entry in %s", 880 _PATH_FTPCHROOT); 881 exit(1); 882 } 883 curclass.type = CLASS_CHROOT; 884 } 885 if (class == NULL) { 886 switch (curclass.type) { 887 case CLASS_GUEST: 888 class = xstrdup("guest"); 889 break; 890 case CLASS_CHROOT: 891 class = xstrdup("chroot"); 892 break; 893 case CLASS_REAL: 894 class = xstrdup("real"); 895 break; 896 default: 897 abort(); 898 } 899 } 900 901 /* parse ftpd.conf, setting up various parameters */ 902 parse_conf(class); 903 count_users(); 904 if (curclass.limit != -1 && connections > curclass.limit) { 905 if (! EMPTYSTR(curclass.limitfile)) 906 (void)format_file(conffilename(curclass.limitfile),530); 907 reply(530, 908 "User %s access denied, connection limit of %d reached.", 909 pw->pw_name, curclass.limit); 910 syslog(LOG_NOTICE, 911 "Maximum connection limit of %d for class %s reached, login refused", 912 curclass.limit, curclass.classname); 913 goto bad; 914 } 915 916 home = "/"; 917 switch (curclass.type) { 918 case CLASS_GUEST: 919 /* 920 * We MUST do a chdir() after the chroot. Otherwise 921 * the old current directory will be accessible as "." 922 * outside the new root! 923 */ 924 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 925 chdir("/") < 0) { 926 reply(550, "Can't set guest privileges."); 927 goto bad; 928 } 929 break; 930 case CLASS_CHROOT: 931 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 932 reply(550, "Can't change root."); 933 goto bad; 934 } 935 break; 936 case CLASS_REAL: 937 if (chdir(pw->pw_dir) < 0) { 938 if (chdir("/") < 0) { 939 reply(530, 940 "User %s: can't change directory to %s.", 941 pw->pw_name, pw->pw_dir); 942 goto bad; 943 } else 944 reply(-230, 945 "No directory! Logging in with home=/"); 946 } else 947 home = pw->pw_dir; 948 break; 949 } 950 if (seteuid((uid_t)pw->pw_uid) < 0) { 951 reply(550, "Can't set uid."); 952 goto bad; 953 } 954 setenv("HOME", home, 1); 955 956 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 957 quietmessages = 1; 958 959 /* 960 * Display a login message, if it exists. 961 * N.B. reply(230,) must follow the message. 962 */ 963 (void)format_file(conffilename(curclass.motd), 230); 964 show_chdir_messages(230); 965 if (curclass.type == CLASS_GUEST) { 966 reply(230, "Guest login ok, access restrictions apply."); 967 #ifdef HASSETPROCTITLE 968 snprintf(proctitle, sizeof(proctitle), 969 "%s: anonymous/%.*s", remotehost, 970 (int) (sizeof(proctitle) - sizeof(remotehost) - 971 sizeof(": anonymous/")), passwd); 972 setproctitle("%s", proctitle); 973 #endif /* HASSETPROCTITLE */ 974 if (logging) 975 syslog(LOG_INFO, 976 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 977 remotehost, passwd, 978 curclass.classname, CURCLASSTYPE); 979 } else { 980 reply(230, "User %s logged in.", pw->pw_name); 981 #ifdef HASSETPROCTITLE 982 snprintf(proctitle, sizeof(proctitle), 983 "%s: %s", remotehost, pw->pw_name); 984 setproctitle("%s", proctitle); 985 #endif /* HASSETPROCTITLE */ 986 if (logging) 987 syslog(LOG_INFO, 988 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 989 remotehost, pw->pw_name, 990 curclass.classname, CURCLASSTYPE); 991 } 992 (void) umask(curclass.umask); 993 goto cleanuppass; 994 bad: 995 /* Forget all about it... */ 996 end_login(); 997 cleanuppass: 998 if (class) 999 free(class); 1000 } 1001 1002 void 1003 retrieve(char *argv[], const char *name) 1004 { 1005 FILE *fin, *dout; 1006 struct stat st; 1007 int (*closefunc)(FILE *) = NULL; 1008 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1009 struct timeval start, finish, td, *tdp; 1010 const char *dispname; 1011 1012 sendrv = closerv = stderrfd = -1; 1013 isconversion = isdata = isls = log = 0; 1014 tdp = NULL; 1015 dispname = name; 1016 fin = dout = NULL; 1017 if (argv == NULL) { 1018 log = 1; 1019 isdata = 1; 1020 fin = fopen(name, "r"); 1021 closefunc = fclose; 1022 if (fin == NULL) 1023 argv = do_conversion(name); 1024 if (argv != NULL) { 1025 isconversion++; 1026 syslog(LOG_INFO, "get command: '%s' on '%s'", 1027 argv[0], name); 1028 } 1029 } 1030 if (argv != NULL) { 1031 char temp[MAXPATHLEN]; 1032 1033 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1034 isls = 1; 1035 stderrfd = -1; 1036 } else { 1037 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1038 stderrfd = mkstemp(temp); 1039 if (stderrfd != -1) 1040 (void)unlink(temp); 1041 } 1042 dispname = argv[0]; 1043 fin = ftpd_popen(argv, "r", stderrfd); 1044 closefunc = ftpd_pclose; 1045 st.st_size = -1; 1046 st.st_blksize = BUFSIZ; 1047 } 1048 if (fin == NULL) { 1049 if (errno != 0) { 1050 perror_reply(550, dispname); 1051 if (log) 1052 logcmd("get", -1, name, NULL, NULL, 1053 strerror(errno)); 1054 } 1055 goto cleanupretrieve; 1056 } 1057 byte_count = -1; 1058 if (argv == NULL 1059 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1060 reply(550, "%s: not a plain file.", dispname); 1061 goto done; 1062 } 1063 if (restart_point) { 1064 if (type == TYPE_A) { 1065 off_t i; 1066 int c; 1067 1068 for (i = 0; i < restart_point; i++) { 1069 if ((c=getc(fin)) == EOF) { 1070 perror_reply(550, dispname); 1071 goto done; 1072 } 1073 if (c == '\n') 1074 i++; 1075 } 1076 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1077 perror_reply(550, dispname); 1078 goto done; 1079 } 1080 } 1081 dout = dataconn(dispname, st.st_size, "w"); 1082 if (dout == NULL) 1083 goto done; 1084 1085 (void)gettimeofday(&start, NULL); 1086 sendrv = send_data(fin, dout, st.st_blksize, isdata); 1087 (void)gettimeofday(&finish, NULL); 1088 (void) fclose(dout); /* close now to affect timing stats */ 1089 dout = NULL; 1090 timersub(&finish, &start, &td); 1091 tdp = &td; 1092 done: 1093 if (log) 1094 logcmd("get", byte_count, name, NULL, tdp, NULL); 1095 closerv = (*closefunc)(fin); 1096 if (sendrv == 0) { 1097 FILE *err; 1098 struct stat sb; 1099 1100 if (!isls && argv != NULL && closerv != 0) { 1101 reply(-226, 1102 "Command returned an exit status of %d", 1103 closerv); 1104 if (isconversion) 1105 syslog(LOG_INFO, 1106 "retrieve command: '%s' returned %d", 1107 argv[0], closerv); 1108 } 1109 if (!isls && argv != NULL && stderrfd != -1 && 1110 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1111 ((err = fdopen(stderrfd, "r")) != NULL)) { 1112 char *cp, line[LINE_MAX]; 1113 1114 reply(-226, "Command error messages:"); 1115 rewind(err); 1116 while (fgets(line, sizeof(line), err) != NULL) { 1117 if ((cp = strchr(line, '\n')) != NULL) 1118 *cp = '\0'; 1119 reply(0, " %s", line); 1120 } 1121 (void) fflush(stdout); 1122 (void) fclose(err); 1123 /* a reply(226,) must follow */ 1124 } 1125 reply(226, "Transfer complete."); 1126 } 1127 cleanupretrieve: 1128 closedataconn(dout); 1129 if (stderrfd != -1) 1130 (void)close(stderrfd); 1131 if (isconversion) 1132 free(argv); 1133 } 1134 1135 void 1136 store(const char *name, const char *mode, int unique) 1137 { 1138 FILE *fout, *din; 1139 struct stat st; 1140 int (*closefunc)(FILE *); 1141 struct timeval start, finish, td, *tdp; 1142 char *desc; 1143 1144 din = NULL; 1145 desc = (*mode == 'w') ? "put" : "append"; 1146 if (unique && stat(name, &st) == 0 && 1147 (name = gunique(name)) == NULL) { 1148 logcmd(desc, -1, name, NULL, NULL, "cannot create unique file"); 1149 goto cleanupstore; 1150 } 1151 1152 if (restart_point) 1153 mode = "r+"; 1154 fout = fopen(name, mode); 1155 closefunc = fclose; 1156 tdp = NULL; 1157 if (fout == NULL) { 1158 perror_reply(553, name); 1159 logcmd(desc, -1, name, NULL, NULL, strerror(errno)); 1160 goto cleanupstore; 1161 } 1162 byte_count = -1; 1163 if (restart_point) { 1164 if (type == TYPE_A) { 1165 off_t i; 1166 int c; 1167 1168 for (i = 0; i < restart_point; i++) { 1169 if ((c=getc(fout)) == EOF) { 1170 perror_reply(550, name); 1171 goto done; 1172 } 1173 if (c == '\n') 1174 i++; 1175 } 1176 /* 1177 * We must do this seek to "current" position 1178 * because we are changing from reading to 1179 * writing. 1180 */ 1181 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1182 perror_reply(550, name); 1183 goto done; 1184 } 1185 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1186 perror_reply(550, name); 1187 goto done; 1188 } 1189 } 1190 din = dataconn(name, (off_t)-1, "r"); 1191 if (din == NULL) 1192 goto done; 1193 (void)gettimeofday(&start, NULL); 1194 if (receive_data(din, fout) == 0) { 1195 if (unique) 1196 reply(226, "Transfer complete (unique file name:%s).", 1197 name); 1198 else 1199 reply(226, "Transfer complete."); 1200 } 1201 (void)gettimeofday(&finish, NULL); 1202 (void) fclose(din); /* close now to affect timing stats */ 1203 din = NULL; 1204 timersub(&finish, &start, &td); 1205 tdp = &td; 1206 done: 1207 logcmd(desc, byte_count, name, NULL, tdp, NULL); 1208 (*closefunc)(fout); 1209 cleanupstore: 1210 closedataconn(din); 1211 } 1212 1213 static FILE * 1214 getdatasock(const char *mode) 1215 { 1216 int on = 1, s, t, tries; 1217 1218 if (data >= 0) 1219 return (fdopen(data, mode)); 1220 (void) seteuid((uid_t)0); 1221 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1222 if (s < 0) 1223 goto bad; 1224 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1225 (char *) &on, sizeof(on)) < 0) 1226 goto bad; 1227 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1228 (char *) &on, sizeof(on)) < 0) 1229 goto bad; 1230 /* anchor socket to avoid multi-homing problems */ 1231 data_source = ctrl_addr; 1232 data_source.su_port = htons(20); /* ftp-data port */ 1233 for (tries = 1; ; tries++) { 1234 if (bind(s, (struct sockaddr *)&data_source, 1235 data_source.su_len) >= 0) 1236 break; 1237 if (errno != EADDRINUSE || tries > 10) 1238 goto bad; 1239 sleep(tries); 1240 } 1241 (void) seteuid((uid_t)pw->pw_uid); 1242 #ifdef IP_TOS 1243 if (!mapped && ctrl_addr.su_family == AF_INET) { 1244 on = IPTOS_THROUGHPUT; 1245 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1246 sizeof(int)) < 0) 1247 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1248 } 1249 #endif 1250 return (fdopen(s, mode)); 1251 bad: 1252 /* Return the real value of errno (close may change it) */ 1253 t = errno; 1254 (void) seteuid((uid_t)pw->pw_uid); 1255 (void) close(s); 1256 errno = t; 1257 return (NULL); 1258 } 1259 1260 FILE * 1261 dataconn(const char *name, off_t size, const char *mode) 1262 { 1263 char sizebuf[32]; 1264 FILE *file; 1265 int retry = 0, tos, keepalive; 1266 1267 file_size = size; 1268 byte_count = 0; 1269 if (size != (off_t) -1) 1270 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd byte%s)", 1271 (qdfmt_t)size, PLURAL(size)); 1272 else 1273 sizebuf[0] = '\0'; 1274 if (pdata >= 0) { 1275 union sockunion from; 1276 int s, fromlen = sizeof(from); 1277 1278 (void) alarm(curclass.timeout); 1279 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1280 (void) alarm(0); 1281 if (s < 0) { 1282 reply(425, "Can't open data connection."); 1283 (void) close(pdata); 1284 pdata = -1; 1285 return (NULL); 1286 } 1287 (void) close(pdata); 1288 pdata = s; 1289 switch (from.su_family) { 1290 case AF_INET: 1291 #ifdef IP_TOS 1292 if (!mapped) { 1293 tos = IPTOS_THROUGHPUT; 1294 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1295 (char *)&tos, sizeof(int)); 1296 } 1297 break; 1298 #endif 1299 } 1300 /* Set keepalives on the socket to detect dropped conns. */ 1301 #ifdef SO_KEEPALIVE 1302 keepalive = 1; 1303 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1304 (char *)&keepalive, sizeof(int)); 1305 #endif 1306 reply(150, "Opening %s mode data connection for '%s'%s.", 1307 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1308 return (fdopen(pdata, mode)); 1309 } 1310 if (data >= 0) { 1311 reply(125, "Using existing data connection for '%s'%s.", 1312 name, sizebuf); 1313 usedefault = 1; 1314 return (fdopen(data, mode)); 1315 } 1316 if (usedefault) 1317 data_dest = his_addr; 1318 usedefault = 1; 1319 file = getdatasock(mode); 1320 if (file == NULL) { 1321 char hbuf[INET6_ADDRSTRLEN]; 1322 char pbuf[10]; 1323 getnameinfo((struct sockaddr *)&data_source, data_source.su_len, 1324 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1325 NI_NUMERICHOST | NI_NUMERICSERV); 1326 reply(425, "Can't create data socket (%s,%s): %s.", 1327 hbuf, pbuf, strerror(errno)); 1328 return (NULL); 1329 } 1330 data = fileno(file); 1331 while (connect(data, (struct sockaddr *)&data_dest, 1332 data_dest.su_len) < 0) { 1333 if (errno == EADDRINUSE && retry < swaitmax) { 1334 sleep((unsigned) swaitint); 1335 retry += swaitint; 1336 continue; 1337 } 1338 perror_reply(425, "Can't build data connection"); 1339 (void) fclose(file); 1340 data = -1; 1341 return (NULL); 1342 } 1343 reply(150, "Opening %s mode data connection for '%s'%s.", 1344 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1345 return (file); 1346 } 1347 1348 void 1349 closedataconn(FILE *fd) 1350 { 1351 1352 if (fd != NULL) 1353 (void)fclose(fd); 1354 data = -1; 1355 if (pdata >= 0) 1356 (void)close(pdata); 1357 pdata = -1; 1358 } 1359 1360 /* 1361 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1362 * encapsulation of the data subject * to Mode, Structure, and Type. 1363 * 1364 * NB: Form isn't handled. 1365 */ 1366 static int 1367 send_data(FILE *instr, FILE *outstr, off_t blksize, int isdata) 1368 { 1369 int c, filefd, netfd, rval; 1370 char *buf; 1371 1372 transflag = 1; 1373 rval = -1; 1374 buf = NULL; 1375 if (setjmp(urgcatch)) 1376 goto cleanup_send_data; 1377 1378 switch (type) { 1379 1380 case TYPE_A: 1381 /* XXXX: rate limit ascii send (get) */ 1382 (void) alarm(curclass.timeout); 1383 while ((c = getc(instr)) != EOF) { 1384 byte_count++; 1385 if (c == '\n') { 1386 if (ferror(outstr)) 1387 goto data_err; 1388 (void) putc('\r', outstr); 1389 if (isdata) { 1390 total_data_out++; 1391 total_data++; 1392 } 1393 total_bytes_out++; 1394 total_bytes++; 1395 } 1396 (void) putc(c, outstr); 1397 if (isdata) { 1398 total_data_out++; 1399 total_data++; 1400 } 1401 total_bytes_out++; 1402 total_bytes++; 1403 if ((byte_count % 4096) == 0) 1404 (void) alarm(curclass.timeout); 1405 } 1406 (void) alarm(0); 1407 fflush(outstr); 1408 if (ferror(instr)) 1409 goto file_err; 1410 if (ferror(outstr)) 1411 goto data_err; 1412 rval = 0; 1413 goto cleanup_send_data; 1414 1415 case TYPE_I: 1416 case TYPE_L: 1417 if ((buf = malloc((size_t)blksize)) == NULL) { 1418 perror_reply(451, "Local resource failure: malloc"); 1419 goto cleanup_send_data; 1420 } 1421 filefd = fileno(instr); 1422 netfd = fileno(outstr); 1423 (void) alarm(curclass.timeout); 1424 if (curclass.rateget) { 1425 while (1) { 1426 int d; 1427 struct timeval then, now, td; 1428 off_t bufrem; 1429 char *bufp; 1430 1431 (void)gettimeofday(&then, NULL); 1432 errno = c = d = 0; 1433 bufrem = curclass.rateget; 1434 while (bufrem > 0) { 1435 if ((c = read(filefd, buf, 1436 MIN(blksize, bufrem))) <= 0) 1437 goto senddone; 1438 (void) alarm(curclass.timeout); 1439 bufrem -= c; 1440 byte_count += c; 1441 if (isdata) { 1442 total_data_out += c; 1443 total_data += c; 1444 } 1445 total_bytes_out += c; 1446 total_bytes += c; 1447 for (bufp = buf; c > 0; 1448 c -= d, bufp += d) 1449 if ((d = 1450 write(netfd, bufp, c)) <= 0) 1451 break; 1452 if (d < 0) 1453 goto data_err; 1454 } 1455 (void)gettimeofday(&now, NULL); 1456 timersub(&now, &then, &td); 1457 if (td.tv_sec == 0) 1458 usleep(1000000 - td.tv_usec); 1459 } 1460 } else { 1461 while ((c = read(filefd, buf, (size_t)blksize)) > 0) { 1462 if (write(netfd, buf, c) != c) 1463 goto data_err; 1464 (void) alarm(curclass.timeout); 1465 byte_count += c; 1466 if (isdata) { 1467 total_data_out += c; 1468 total_data += c; 1469 } 1470 total_bytes_out += c; 1471 total_bytes += c; 1472 } 1473 } 1474 senddone: 1475 if (c < 0) 1476 goto file_err; 1477 rval = 0; 1478 goto cleanup_send_data; 1479 1480 default: 1481 reply(550, "Unimplemented TYPE %d in send_data", type); 1482 goto cleanup_send_data; 1483 } 1484 1485 data_err: 1486 (void) alarm(0); 1487 perror_reply(426, "Data connection"); 1488 goto cleanup_send_data; 1489 1490 file_err: 1491 (void) alarm(0); 1492 perror_reply(551, "Error on input file"); 1493 /* FALLTHROUGH */ 1494 1495 cleanup_send_data: 1496 (void) alarm(0); 1497 transflag = 0; 1498 if (buf) 1499 free(buf); 1500 if (isdata) { 1501 total_files_out++; 1502 total_files++; 1503 } 1504 total_xfers_out++; 1505 total_xfers++; 1506 return (rval); 1507 } 1508 1509 /* 1510 * Transfer data from peer to "outstr" using the appropriate encapulation of 1511 * the data subject to Mode, Structure, and Type. 1512 * 1513 * N.B.: Form isn't handled. 1514 */ 1515 static int 1516 receive_data(FILE *instr, FILE *outstr) 1517 { 1518 int c, bare_lfs, netfd, filefd, rval; 1519 char buf[BUFSIZ]; 1520 #ifdef __GNUC__ 1521 (void) &bare_lfs; 1522 #endif 1523 1524 bare_lfs = 0; 1525 transflag = 1; 1526 rval = -1; 1527 if (setjmp(urgcatch)) 1528 goto cleanup_recv_data; 1529 1530 switch (type) { 1531 1532 case TYPE_I: 1533 case TYPE_L: 1534 netfd = fileno(instr); 1535 filefd = fileno(outstr); 1536 (void) alarm(curclass.timeout); 1537 if (curclass.rateput) { 1538 while (1) { 1539 int d; 1540 struct timeval then, now, td; 1541 off_t bufrem; 1542 1543 (void)gettimeofday(&then, NULL); 1544 errno = c = d = 0; 1545 for (bufrem = curclass.rateput; bufrem > 0; ) { 1546 if ((c = read(netfd, buf, 1547 MIN(sizeof(buf), bufrem))) <= 0) 1548 goto recvdone; 1549 if ((d = write(filefd, buf, c)) != c) 1550 goto recvdone; 1551 (void) alarm(curclass.timeout); 1552 bufrem -= c; 1553 byte_count += c; 1554 total_data_in += c; 1555 total_data += c; 1556 total_bytes_in += c; 1557 total_bytes += c; 1558 } 1559 (void)gettimeofday(&now, NULL); 1560 timersub(&now, &then, &td); 1561 if (td.tv_sec == 0) 1562 usleep(1000000 - td.tv_usec); 1563 } 1564 } else { 1565 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1566 if (write(filefd, buf, c) != c) 1567 goto file_err; 1568 (void) alarm(curclass.timeout); 1569 byte_count += c; 1570 total_data_in += c; 1571 total_data += c; 1572 total_bytes_in += c; 1573 total_bytes += c; 1574 } 1575 } 1576 recvdone: 1577 if (c < 0) 1578 goto data_err; 1579 rval = 0; 1580 goto cleanup_recv_data; 1581 1582 case TYPE_E: 1583 reply(553, "TYPE E not implemented."); 1584 goto cleanup_recv_data; 1585 1586 case TYPE_A: 1587 (void) alarm(curclass.timeout); 1588 /* XXXX: rate limit ascii receive (put) */ 1589 while ((c = getc(instr)) != EOF) { 1590 byte_count++; 1591 total_data_in++; 1592 total_data++; 1593 total_bytes_in++; 1594 total_bytes++; 1595 if ((byte_count % 4096) == 0) 1596 (void) alarm(curclass.timeout); 1597 if (c == '\n') 1598 bare_lfs++; 1599 while (c == '\r') { 1600 if (ferror(outstr)) 1601 goto data_err; 1602 if ((c = getc(instr)) != '\n') { 1603 byte_count++; 1604 total_data_in++; 1605 total_data++; 1606 total_bytes_in++; 1607 total_bytes++; 1608 if ((byte_count % 4096) == 0) 1609 (void) alarm(curclass.timeout); 1610 (void) putc ('\r', outstr); 1611 if (c == '\0' || c == EOF) 1612 goto contin2; 1613 } 1614 } 1615 (void) putc(c, outstr); 1616 contin2: ; 1617 } 1618 (void) alarm(0); 1619 fflush(outstr); 1620 if (ferror(instr)) 1621 goto data_err; 1622 if (ferror(outstr)) 1623 goto file_err; 1624 if (bare_lfs) { 1625 reply(-226, 1626 "WARNING! %d bare linefeeds received in ASCII mode", 1627 bare_lfs); 1628 reply(0, "File may not have transferred correctly."); 1629 } 1630 rval = 0; 1631 goto cleanup_recv_data; 1632 1633 default: 1634 reply(550, "Unimplemented TYPE %d in receive_data", type); 1635 goto cleanup_recv_data; 1636 } 1637 1638 data_err: 1639 (void) alarm(0); 1640 perror_reply(426, "Data Connection"); 1641 goto cleanup_recv_data; 1642 1643 file_err: 1644 (void) alarm(0); 1645 perror_reply(452, "Error writing file"); 1646 goto cleanup_recv_data; 1647 1648 cleanup_recv_data: 1649 (void) alarm(0); 1650 transflag = 0; 1651 total_files_in++; 1652 total_files++; 1653 total_xfers_in++; 1654 total_xfers++; 1655 return (rval); 1656 } 1657 1658 void 1659 statcmd(void) 1660 { 1661 union sockunion *su = NULL; 1662 static char ntop_buf[INET6_ADDRSTRLEN]; 1663 u_char *a, *p; 1664 int ispassive, af; 1665 off_t otbi, otbo, otb; 1666 1667 a = p = (u_char *)NULL; 1668 1669 reply(-211, "%s FTP server status:", hostname); 1670 reply(0, "Version: %s", FTPD_VERSION); 1671 ntop_buf[0] = '\0'; 1672 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1673 ntop_buf, sizeof(ntop_buf), NULL, 0, NI_NUMERICHOST) 1674 && strcmp(remotehost, ntop_buf) != 0) { 1675 reply(0, "Connected to %s (%s)", remotehost, ntop_buf); 1676 } else 1677 reply(0, "Connected to %s", remotehost); 1678 if (logged_in) { 1679 if (curclass.type == CLASS_GUEST) 1680 reply(0, "Logged in anonymously"); 1681 else 1682 reply(0, "Logged in as %s%s", pw->pw_name, 1683 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 1684 } else if (askpasswd) 1685 reply(0, "Waiting for password"); 1686 else 1687 reply(0, "Waiting for user name"); 1688 cprintf(stdout, " TYPE: %s", typenames[type]); 1689 if (type == TYPE_A || type == TYPE_E) 1690 cprintf(stdout, ", FORM: %s", formnames[form]); 1691 if (type == TYPE_L) { 1692 #if NBBY == 8 1693 cprintf(stdout, " %d", NBBY); 1694 #else 1695 /* XXX: `bytesize' needs to be defined in this case */ 1696 cprintf(stdout, " %d", bytesize); 1697 #endif 1698 } 1699 cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n", 1700 strunames[stru], modenames[mode]); 1701 ispassive = 0; 1702 if (data != -1) { 1703 reply(0, "Data connection open"); 1704 su = NULL; 1705 } else if (pdata != -1) { 1706 reply(0, "in Passive mode"); 1707 su = (union sockunion *)&pasv_addr; 1708 ispassive = 1; 1709 goto printaddr; 1710 } else if (usedefault == 0) { 1711 if (epsvall) { 1712 reply(0, "EPSV only mode (EPSV ALL)"); 1713 goto epsvonly; 1714 } 1715 su = (union sockunion *)&data_dest; 1716 printaddr: 1717 /* PASV/PORT */ 1718 if (su->su_family == AF_INET) { 1719 a = (u_char *) &su->su_sin.sin_addr; 1720 p = (u_char *) &su->su_sin.sin_port; 1721 #define UC(b) (((int) b) & 0xff) 1722 reply(0, "%s (%d,%d,%d,%d,%d,%d)", 1723 ispassive ? "PASV" : "PORT" , 1724 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1725 UC(p[0]), UC(p[1])); 1726 } 1727 1728 /* LPSV/LPRT */ 1729 { 1730 int alen, af, i; 1731 1732 alen = 0; 1733 switch (su->su_family) { 1734 case AF_INET: 1735 a = (u_char *) &su->su_sin.sin_addr; 1736 p = (u_char *) &su->su_sin.sin_port; 1737 alen = sizeof(su->su_sin.sin_addr); 1738 af = 4; 1739 break; 1740 case AF_INET6: 1741 a = (u_char *) &su->su_sin6.sin6_addr; 1742 p = (u_char *) &su->su_sin6.sin6_port; 1743 alen = sizeof(su->su_sin6.sin6_addr); 1744 af = 6; 1745 break; 1746 default: 1747 af = 0; 1748 break; 1749 } 1750 if (af) { 1751 cprintf(stdout, " %s (%d,%d", 1752 ispassive ? "LPSV" : "LPRT", af, alen); 1753 for (i = 0; i < alen; i++) 1754 cprintf(stdout, ",%d", UC(a[i])); 1755 cprintf(stdout, ",%d,%d,%d)", 2, UC(p[0]), UC(p[1])); 1756 #undef UC 1757 } 1758 } 1759 1760 /* EPRT/EPSV */ 1761 epsvonly: 1762 switch (su->su_family) { 1763 case AF_INET: 1764 af = 1; 1765 break; 1766 case AF_INET6: 1767 af = 2; 1768 break; 1769 default: 1770 af = 0; 1771 break; 1772 } 1773 if (af) { 1774 if (getnameinfo((struct sockaddr *)su, su->su_len, 1775 ntop_buf, sizeof(ntop_buf), NULL, 0, 1776 NI_NUMERICHOST) == 0) { 1777 reply(0, "%s (|%d|%s|%d|)", 1778 ispassive ? "EPSV" : "EPRT", 1779 af, ntop_buf, ntohs(su->su_port)); 1780 } 1781 } 1782 } else 1783 reply(0, "No data connection"); 1784 1785 if (logged_in) { 1786 reply(0, "Data sent: %qd byte%s in %qd file%s", 1787 (qdfmt_t)total_data_out, PLURAL(total_data_out), 1788 (qdfmt_t)total_files_out, PLURAL(total_files_out)); 1789 reply(0, "Data received: %qd byte%s in %qd file%s", 1790 (qdfmt_t)total_data_in, PLURAL(total_data_in), 1791 (qdfmt_t)total_files_in, PLURAL(total_files_in)); 1792 reply(0, "Total data: %qd byte%s in %qd file%s", 1793 (qdfmt_t)total_data, PLURAL(total_data), 1794 (qdfmt_t)total_files, PLURAL(total_files)); 1795 } 1796 otbi = total_bytes_in; 1797 otbo = total_bytes_out; 1798 otb = total_bytes; 1799 reply(0, "Traffic sent: %qd byte%s in %qd transfer%s", 1800 (qdfmt_t)otbo, PLURAL(otbo), 1801 (qdfmt_t)total_xfers_out, PLURAL(total_xfers_out)); 1802 reply(0, "Traffic received: %qd byte%s in %qd transfer%s", 1803 (qdfmt_t)otbi, PLURAL(otbi), 1804 (qdfmt_t)total_xfers_in, PLURAL(total_xfers_in)); 1805 reply(0, "Total traffic: %qd byte%s in %qd transfer%s", 1806 (qdfmt_t)otb, PLURAL(otb), 1807 (qdfmt_t)total_xfers, PLURAL(total_xfers)); 1808 1809 if (logged_in) { 1810 struct ftpconv *cp; 1811 1812 reply(0, "%s", ""); 1813 reply(0, "Class: %s, type: %s", 1814 curclass.classname, CURCLASSTYPE); 1815 reply(0, "Check PORT/LPRT commands: %sabled", 1816 curclass.checkportcmd ? "en" : "dis"); 1817 if (curclass.display != NULL) 1818 reply(0, "Display file: %s", curclass.display); 1819 if (curclass.notify != NULL) 1820 reply(0, "Notify fileglob: %s", curclass.notify); 1821 reply(0, "Idle timeout: %d, maximum timeout: %d", 1822 curclass.timeout, curclass.maxtimeout); 1823 reply(0, "Current connections: %d", connections); 1824 if (curclass.limit == -1) 1825 reply(0, "Maximum connections: unlimited"); 1826 else 1827 reply(0, "Maximum connections: %d", curclass.limit); 1828 if (curclass.limitfile) 1829 reply(0, "Connection limit exceeded file: %s", 1830 curclass.limitfile); 1831 if (curclass.motd != NULL) 1832 reply(0, "MotD file: %s", curclass.motd); 1833 reply(0, 1834 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 1835 curclass.modify ? "en" : "dis"); 1836 reply(0, "Upload commands (APPE, STOR, STOU): %sabled", 1837 curclass.upload ? "en" : "dis"); 1838 if (curclass.portmin && curclass.portmax) 1839 reply(0, "PASV port range: %d - %d", 1840 curclass.portmin, curclass.portmax); 1841 if (curclass.rateget) 1842 reply(0, "Rate get limit: %d bytes/sec", 1843 curclass.rateget); 1844 else 1845 reply(0, "Rate get limit: disabled"); 1846 if (curclass.rateput) 1847 reply(0, "Rate put limit: %d bytes/sec", 1848 curclass.rateput); 1849 else 1850 reply(0, "Rate put limit: disabled"); 1851 reply(0, "Umask: %.04o", curclass.umask); 1852 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1853 if (cp->suffix == NULL || cp->types == NULL || 1854 cp->command == NULL) 1855 continue; 1856 reply(0, "Conversion: %s [%s] disable: %s, command: %s", 1857 cp->suffix, cp->types, cp->disable, cp->command); 1858 } 1859 } 1860 1861 reply(211, "End of status"); 1862 } 1863 1864 void 1865 fatal(const char *s) 1866 { 1867 1868 reply(451, "Error in server: %s\n", s); 1869 reply(221, "Closing connection due to server error."); 1870 dologout(0); 1871 /* NOTREACHED */ 1872 } 1873 1874 /* 1875 * reply() -- 1876 * depending on the value of n, display fmt with a trailing CRLF and 1877 * prefix of: 1878 * n < -1 prefix the message with abs(n) + "-" (initial line) 1879 * n == 0 prefix the message with 4 spaces (middle lines) 1880 * n > 0 prefix the message with n + " " (final line) 1881 */ 1882 void 1883 reply(int n, const char *fmt, ...) 1884 { 1885 off_t b; 1886 va_list ap; 1887 1888 va_start(ap, fmt); 1889 b = 0; 1890 if (n == 0) 1891 cprintf(stdout, " "); 1892 else if (n < 0) 1893 cprintf(stdout, "%d-", -n); 1894 else 1895 cprintf(stdout, "%d ", n); 1896 b = vprintf(fmt, ap); 1897 total_bytes += b; 1898 total_bytes_out += b; 1899 cprintf(stdout, "\r\n"); 1900 (void)fflush(stdout); 1901 if (debug) { 1902 syslog(LOG_DEBUG, "<--- %d%c", abs(n), (n < 0) ? '-' : ' '); 1903 vsyslog(LOG_DEBUG, fmt, ap); 1904 } 1905 } 1906 1907 static void 1908 dolog(struct sockaddr *who) 1909 { 1910 getnameinfo(who, who->sa_len, remotehost, sizeof(remotehost), NULL,0,0); 1911 #ifdef HASSETPROCTITLE 1912 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1913 setproctitle("%s", proctitle); 1914 #endif /* HASSETPROCTITLE */ 1915 if (logging) 1916 syslog(LOG_INFO, "connection from %s to %s", 1917 remotehost, hostname); 1918 } 1919 1920 /* 1921 * Record logout in wtmp file 1922 * and exit with supplied status. 1923 */ 1924 void 1925 dologout(int status) 1926 { 1927 /* 1928 * Prevent reception of SIGURG from resulting in a resumption 1929 * back to the main program loop. 1930 */ 1931 transflag = 0; 1932 1933 if (logged_in) { 1934 (void) seteuid((uid_t)0); 1935 logwtmp(ttyline, "", ""); 1936 if (doutmp) 1937 logout(utmp.ut_line); 1938 #ifdef KERBEROS 1939 if (!notickets && krbtkfile_env) 1940 unlink(krbtkfile_env); 1941 #endif 1942 } 1943 /* beware of flushing buffers after a SIGPIPE */ 1944 _exit(status); 1945 } 1946 1947 static void 1948 myoob(int signo) 1949 { 1950 char *cp; 1951 1952 /* only process if transfer occurring */ 1953 if (!transflag) 1954 return; 1955 cp = tmpline; 1956 if (getline(cp, 7, stdin) == NULL) { 1957 reply(221, "You could at least say goodbye."); 1958 dologout(0); 1959 } 1960 if (strcasecmp(cp, "ABOR\r\n") == 0) { 1961 tmpline[0] = '\0'; 1962 reply(426, "Transfer aborted. Data connection closed."); 1963 reply(226, "Abort successful"); 1964 longjmp(urgcatch, 1); 1965 } 1966 if (strcasecmp(cp, "STAT\r\n") == 0) { 1967 tmpline[0] = '\0'; 1968 if (file_size != (off_t) -1) 1969 reply(213, "Status: %qd of %qd byte%s transferred", 1970 (qdfmt_t)byte_count, (qdfmt_t)file_size, 1971 PLURAL(byte_count)); 1972 else 1973 reply(213, "Status: %qd byte%s transferred", 1974 (qdfmt_t)byte_count, PLURAL(byte_count)); 1975 } 1976 } 1977 1978 static int 1979 bind_pasv_addr(void) 1980 { 1981 static int passiveport; 1982 int port, len; 1983 1984 len = pasv_addr.su_len; 1985 if (curclass.portmin == 0 && curclass.portmax == 0) { 1986 pasv_addr.su_port = 0; 1987 return (bind(pdata, (struct sockaddr *)&pasv_addr, len)); 1988 } 1989 1990 if (passiveport == 0) { 1991 srand(getpid()); 1992 passiveport = rand() % (curclass.portmax - curclass.portmin) 1993 + curclass.portmin; 1994 } 1995 1996 port = passiveport; 1997 while (1) { 1998 port++; 1999 if (port > curclass.portmax) 2000 port = curclass.portmin; 2001 else if (port == passiveport) { 2002 errno = EAGAIN; 2003 return (-1); 2004 } 2005 pasv_addr.su_port = htons(port); 2006 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) == 0) 2007 break; 2008 if (errno != EADDRINUSE) 2009 return (-1); 2010 } 2011 passiveport = port; 2012 return (0); 2013 } 2014 2015 /* 2016 * Note: a response of 425 is not mentioned as a possible response to 2017 * the PASV command in RFC959. However, it has been blessed as 2018 * a legitimate response by Jon Postel in a telephone conversation 2019 * with Rick Adams on 25 Jan 89. 2020 */ 2021 void 2022 passive(void) 2023 { 2024 int len; 2025 char *p, *a; 2026 2027 if (pdata >= 0) 2028 close(pdata); 2029 pdata = socket(AF_INET, SOCK_STREAM, 0); 2030 if (pdata < 0 || !logged_in) { 2031 perror_reply(425, "Can't open passive connection"); 2032 return; 2033 } 2034 pasv_addr = ctrl_addr; 2035 2036 if (bind_pasv_addr() < 0) 2037 goto pasv_error; 2038 len = pasv_addr.su_len; 2039 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2040 goto pasv_error; 2041 if (listen(pdata, 1) < 0) 2042 goto pasv_error; 2043 a = (char *) &pasv_addr.su_sin.sin_addr; 2044 p = (char *) &pasv_addr.su_port; 2045 2046 #define UC(b) (((int) b) & 0xff) 2047 2048 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2049 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2050 return; 2051 2052 pasv_error: 2053 (void) close(pdata); 2054 pdata = -1; 2055 perror_reply(425, "Can't open passive connection"); 2056 return; 2057 } 2058 2059 /* 2060 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2061 * 229 Entering Extended Passive Mode (|||port|) 2062 */ 2063 void 2064 long_passive(char *cmd, int pf) 2065 { 2066 int len; 2067 char *p, *a; 2068 2069 if (!logged_in) { 2070 syslog(LOG_NOTICE, "long passive but not logged in"); 2071 reply(503, "Login with USER first."); 2072 return; 2073 } 2074 2075 if (pf != PF_UNSPEC) { 2076 if (ctrl_addr.su_family != pf) { 2077 switch (ctrl_addr.su_family) { 2078 case AF_INET: 2079 pf = 1; 2080 break; 2081 case AF_INET6: 2082 pf = 2; 2083 break; 2084 default: 2085 pf = 0; 2086 break; 2087 } 2088 /* 2089 * XXX 2090 * only EPRT/EPSV ready clients will understand this 2091 */ 2092 if (strcmp(cmd, "EPSV") == 0 && pf) { 2093 reply(522, "Network protocol mismatch, " 2094 "use (%d)", pf); 2095 } else 2096 reply(501, "Network protocol mismatch"); /*XXX*/ 2097 2098 return; 2099 } 2100 } 2101 2102 if (pdata >= 0) 2103 close(pdata); 2104 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2105 if (pdata < 0) { 2106 perror_reply(425, "Can't open passive connection"); 2107 return; 2108 } 2109 pasv_addr = ctrl_addr; 2110 if (bind_pasv_addr() < 0) 2111 goto pasv_error; 2112 len = pasv_addr.su_len; 2113 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2114 goto pasv_error; 2115 if (listen(pdata, 1) < 0) 2116 goto pasv_error; 2117 p = (char *) &pasv_addr.su_port; 2118 2119 #define UC(b) (((int) b) & 0xff) 2120 2121 if (strcmp(cmd, "LPSV") == 0) { 2122 switch (pasv_addr.su_family) { 2123 case AF_INET: 2124 a = (char *) &pasv_addr.su_sin.sin_addr; 2125 reply(228, "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2126 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2127 2, UC(p[0]), UC(p[1])); 2128 return; 2129 case AF_INET6: 2130 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2131 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)", 2132 6, 16, 2133 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2134 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2135 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2136 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2137 2, UC(p[0]), UC(p[1])); 2138 return; 2139 } 2140 #undef UC 2141 } else if (strcmp(cmd, "EPSV") == 0) { 2142 switch (pasv_addr.su_family) { 2143 case AF_INET: 2144 case AF_INET6: 2145 reply(229, "Entering Extended Passive Mode (|||%d|)", 2146 ntohs(pasv_addr.su_port)); 2147 return; 2148 } 2149 } else { 2150 /* more proper error code? */ 2151 } 2152 2153 pasv_error: 2154 (void) close(pdata); 2155 pdata = -1; 2156 perror_reply(425, "Can't open passive connection"); 2157 return; 2158 } 2159 2160 /* 2161 * Generate unique name for file with basename "local". 2162 * The file named "local" is already known to exist. 2163 * Generates failure reply on error. 2164 * 2165 * XXX this function should under go changes similar to 2166 * the mktemp(3)/mkstemp(3) changes. 2167 */ 2168 static char * 2169 gunique(const char *local) 2170 { 2171 static char new[MAXPATHLEN]; 2172 struct stat st; 2173 char *cp; 2174 int count; 2175 2176 cp = strrchr(local, '/'); 2177 if (cp) 2178 *cp = '\0'; 2179 if (stat(cp ? local : ".", &st) < 0) { 2180 perror_reply(553, cp ? local : "."); 2181 return (NULL); 2182 } 2183 if (cp) 2184 *cp = '/'; 2185 for (count = 1; count < 100; count++) { 2186 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2187 if (stat(new, &st) < 0) 2188 return (new); 2189 } 2190 reply(452, "Unique file name cannot be created."); 2191 return (NULL); 2192 } 2193 2194 /* 2195 * Format and send reply containing system error number. 2196 */ 2197 void 2198 perror_reply(int code, const char *string) 2199 { 2200 int save_errno; 2201 2202 save_errno = errno; 2203 reply(code, "%s: %s.", string, strerror(errno)); 2204 errno = save_errno; 2205 } 2206 2207 static char *onefile[] = { 2208 "", 2209 0 2210 }; 2211 2212 void 2213 send_file_list(const char *whichf) 2214 { 2215 struct stat st; 2216 DIR *dirp = NULL; 2217 struct dirent *dir; 2218 FILE *dout = NULL; 2219 char **dirlist, *dirname, *p; 2220 int simple = 0; 2221 int freeglob = 0; 2222 glob_t gl; 2223 off_t b; 2224 2225 #ifdef __GNUC__ 2226 (void) &dout; 2227 (void) &dirlist; 2228 (void) &simple; 2229 (void) &freeglob; 2230 #endif 2231 2232 p = NULL; 2233 if (strpbrk(whichf, "~{[*?") != NULL) { 2234 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2235 2236 memset(&gl, 0, sizeof(gl)); 2237 freeglob = 1; 2238 if (glob(whichf, flags, 0, &gl)) { 2239 reply(550, "not found"); 2240 goto out; 2241 } else if (gl.gl_pathc == 0) { 2242 errno = ENOENT; 2243 perror_reply(550, whichf); 2244 goto out; 2245 } 2246 dirlist = gl.gl_pathv; 2247 } else { 2248 p = xstrdup(whichf); 2249 onefile[0] = p; 2250 dirlist = onefile; 2251 simple = 1; 2252 } 2253 /* XXX: } for vi sm */ 2254 2255 if (setjmp(urgcatch)) { 2256 transflag = 0; 2257 goto out; 2258 } 2259 while ((dirname = *dirlist++) != NULL) { 2260 int trailingslash = 0; 2261 2262 if (stat(dirname, &st) < 0) { 2263 /* 2264 * If user typed "ls -l", etc, and the client 2265 * used NLST, do what the user meant. 2266 */ 2267 /* XXX: nuke this support? */ 2268 if (dirname[0] == '-' && *dirlist == NULL && 2269 transflag == 0) { 2270 char *argv[] = { INTERNAL_LS, "", NULL }; 2271 2272 argv[1] = dirname; 2273 retrieve(argv, dirname); 2274 goto out; 2275 } 2276 perror_reply(550, whichf); 2277 goto cleanup_send_file_list; 2278 } 2279 2280 if (S_ISREG(st.st_mode)) { 2281 if (dout == NULL) { 2282 dout = dataconn("file list", (off_t)-1, "w"); 2283 if (dout == NULL) 2284 goto out; 2285 transflag++; 2286 } 2287 b = fprintf(dout, "%s%s\n", dirname, 2288 type == TYPE_A ? "\r" : ""); 2289 total_bytes += b; 2290 total_bytes_out += b; 2291 byte_count += strlen(dirname) + 1; 2292 continue; 2293 } else if (!S_ISDIR(st.st_mode)) 2294 continue; 2295 2296 if (dirname[strlen(dirname) - 1] == '/') 2297 trailingslash++; 2298 2299 if ((dirp = opendir(dirname)) == NULL) 2300 continue; 2301 2302 while ((dir = readdir(dirp)) != NULL) { 2303 char nbuf[MAXPATHLEN]; 2304 2305 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 2306 continue; 2307 2308 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2309 trailingslash ? "" : "/", dir->d_name); 2310 2311 /* 2312 * We have to do a stat to ensure it's 2313 * not a directory or special file. 2314 */ 2315 /* XXX: follow RFC959 and filter out non files ? */ 2316 if (simple || (stat(nbuf, &st) == 0 && 2317 S_ISREG(st.st_mode))) { 2318 char *p; 2319 2320 if (dout == NULL) { 2321 dout = dataconn("file list", (off_t)-1, 2322 "w"); 2323 if (dout == NULL) 2324 goto out; 2325 transflag++; 2326 } 2327 p = nbuf; 2328 if (nbuf[0] == '.' && nbuf[1] == '/') 2329 p = &nbuf[2]; 2330 b = fprintf(dout, "%s%s\n", p, 2331 type == TYPE_A ? "\r" : ""); 2332 total_bytes += b; 2333 total_bytes_out += b; 2334 byte_count += strlen(nbuf) + 1; 2335 } 2336 } 2337 (void) closedir(dirp); 2338 } 2339 2340 if (dout == NULL) 2341 reply(550, "No files found."); 2342 else if (ferror(dout) != 0) 2343 perror_reply(550, "Data connection"); 2344 else 2345 reply(226, "Transfer complete."); 2346 2347 cleanup_send_file_list: 2348 transflag = 0; 2349 closedataconn(dout); 2350 out: 2351 total_xfers++; 2352 total_xfers_out++; 2353 if (p) 2354 free(p); 2355 if (freeglob) 2356 globfree(&gl); 2357 } 2358 2359 char * 2360 conffilename(const char *s) 2361 { 2362 static char filename[MAXPATHLEN]; 2363 2364 if (*s == '/') 2365 strlcpy(filename, s, sizeof(filename)); 2366 else 2367 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2368 return (filename); 2369 } 2370 2371 /* 2372 * logcmd -- 2373 * based on the arguments, syslog a message: 2374 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2375 * else if file2 != NULL "<command> <file1> <file2>" 2376 * else "<command> <file1>" 2377 * if elapsed != NULL, append "in xxx.yyy seconds" 2378 * if error != NULL, append ": " + error 2379 */ 2380 void 2381 logcmd(const char *command, off_t bytes, const char *file1, const char *file2, 2382 const struct timeval *elapsed, const char *error) 2383 { 2384 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN]; 2385 const char *p; 2386 size_t len; 2387 2388 if (logging <=1) 2389 return; 2390 2391 if ((p = realpath(file1, realfile)) == NULL) { 2392 #if 0 /* XXX: too noisy */ 2393 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2394 realfile, strerror(errno)); 2395 #endif 2396 p = file1; 2397 } 2398 len = snprintf(buf, sizeof(buf), "%s %s", command, p); 2399 2400 if (bytes != (off_t)-1) { 2401 len += snprintf(buf + len, sizeof(buf) - len, 2402 " = %qd byte%s", (qdfmt_t) bytes, PLURAL(bytes)); 2403 } else if (file2 != NULL) { 2404 if ((p = realpath(file2, realfile)) == NULL) { 2405 #if 0 /* XXX: too noisy */ 2406 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2407 realfile, strerror(errno)); 2408 #endif 2409 p = file2; 2410 } 2411 len += snprintf(buf + len, sizeof(buf) - len, " %s", p); 2412 } 2413 2414 if (elapsed != NULL) { 2415 len += snprintf(buf + len, sizeof(buf) - len, 2416 " in %ld.%.03d seconds", elapsed->tv_sec, 2417 (int)(elapsed->tv_usec / 1000)); 2418 } 2419 2420 if (error != NULL) 2421 len += snprintf(buf + len, sizeof(buf) - len, ": %s", error); 2422 2423 syslog(LOG_INFO, "%s", buf); 2424 } 2425 2426 char * 2427 xstrdup(const char *s) 2428 { 2429 char *new = strdup(s); 2430 2431 if (new == NULL) 2432 fatal("Local resource failure: malloc"); 2433 /* NOTREACHED */ 2434 return (new); 2435 } 2436 2437 /* 2438 * As per fprintf(), but increment total_bytes and total_bytes_out, 2439 * by the appropriate amount. 2440 */ 2441 void 2442 cprintf(FILE *fd, const char *fmt, ...) 2443 { 2444 off_t b; 2445 va_list ap; 2446 2447 va_start(ap, fmt); 2448 b = vfprintf(fd, fmt, ap); 2449 total_bytes += b; 2450 total_bytes_out += b; 2451 } 2452
Indexes created Wed Sep 24 14:09:57 GMT 2025