ftpd.c revision 1.100
1 /* $NetBSD: ftpd.c,v 1.100 2000/07/17 02:30:54 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 1.100 2000/07/17 02:30:54 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 homedir[0] = '\0'; 247 gidcount = 0; 248 249 while ((ch = getopt(argc, argv, "a:c:C:dh:Hlst:T:u:Uv")) != -1) { 250 switch (ch) { 251 case 'a': 252 anondir = optarg; 253 break; 254 255 case 'c': 256 (void)strlcpy(confdir, optarg, sizeof(confdir)); 257 break; 258 259 case 'C': 260 pw = sgetpwnam(optarg); 261 exit(checkaccess(optarg) ? 0 : 1); 262 /* NOTREACHED */ 263 264 case 'd': 265 case 'v': /* deprecated */ 266 debug = 1; 267 break; 268 269 case 'h': 270 strlcpy(hostname, optarg, sizeof(hostname)); 271 break; 272 273 case 'H': 274 if (gethostname(hostname, sizeof(hostname)) == -1) 275 hostname[0] = '\0'; 276 hostname[sizeof(hostname) - 1] = '\0'; 277 break; 278 279 case 'l': 280 logging++; /* > 1 == extra logging */ 281 break; 282 283 case 's': 284 sflag = 1; 285 break; 286 287 case 't': 288 case 'T': 289 case 'u': 290 warnx("-%c has been deprecated in favour of ftpd.conf", 291 ch); 292 break; 293 294 case 'U': 295 doutmp = 1; 296 break; 297 298 default: 299 if (optopt == 'a' || optopt == 'C') 300 exit(1); 301 warnx("unknown flag -%c ignored", optopt); 302 break; 303 } 304 } 305 306 /* 307 * LOG_NDELAY sets up the logging connection immediately, 308 * necessary for anonymous ftp's that chroot and can't do it later. 309 */ 310 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 311 addrlen = sizeof(his_addr); /* xxx */ 312 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 313 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 314 exit(1); 315 } 316 addrlen = sizeof(ctrl_addr); 317 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 318 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 319 exit(1); 320 } 321 if (his_addr.su_family == AF_INET6 322 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 323 #if 1 324 /* 325 * IPv4 control connection arrived to AF_INET6 socket. 326 * I hate to do this, but this is the easiest solution. 327 * 328 * The assumption is untrue on SIIT environment. 329 */ 330 union sockunion tmp_addr; 331 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 332 333 tmp_addr = his_addr; 334 memset(&his_addr, 0, sizeof(his_addr)); 335 his_addr.su_sin.sin_family = AF_INET; 336 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 337 memcpy(&his_addr.su_sin.sin_addr, 338 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 339 sizeof(his_addr.su_sin.sin_addr)); 340 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 341 342 tmp_addr = ctrl_addr; 343 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 344 ctrl_addr.su_sin.sin_family = AF_INET; 345 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 346 memcpy(&ctrl_addr.su_sin.sin_addr, 347 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 348 sizeof(ctrl_addr.su_sin.sin_addr)); 349 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 350 #else 351 while (fgets(line, sizeof(line), fd) != NULL) { 352 if ((cp = strchr(line, '\n')) != NULL) 353 *cp = '\0'; 354 reply(-530, "%s", line); 355 } 356 (void) fflush(stdout); 357 (void) fclose(fd); 358 reply(530, 359 "Connection from IPv4 mapped address is not supported."); 360 exit(0); 361 #endif 362 363 mapped = 1; 364 } else 365 mapped = 0; 366 #ifdef IP_TOS 367 if (!mapped && his_addr.su_family == AF_INET) { 368 tos = IPTOS_LOWDELAY; 369 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 370 sizeof(int)) < 0) 371 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 372 } 373 #endif 374 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 375 376 /* if the hostname hasn't been given, attempt to determine it */ 377 if (hostname[0] == '\0') { 378 if (getnameinfo((struct sockaddr *)&ctrl_addr, ctrl_addr.su_len, 379 hostname, sizeof(hostname), NULL, 0, 0) != 0) 380 (void)gethostname(hostname, sizeof(hostname)); 381 hostname[sizeof(hostname) - 1] = '\0'; 382 } 383 384 /* set this here so klogin can use it... */ 385 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 386 387 (void) freopen(_PATH_DEVNULL, "w", stderr); 388 (void) signal(SIGPIPE, lostconn); 389 (void) signal(SIGCHLD, SIG_IGN); 390 if (signal(SIGURG, myoob) == SIG_ERR) 391 syslog(LOG_ERR, "signal: %m"); 392 393 /* Try to handle urgent data inline */ 394 #ifdef SO_OOBINLINE 395 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 396 syslog(LOG_ERR, "setsockopt: %m"); 397 #endif 398 /* Set keepalives on the socket to detect dropped connections. */ 399 #ifdef SO_KEEPALIVE 400 keepalive = 1; 401 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 402 sizeof(int)) < 0) 403 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 404 #endif 405 406 #ifdef F_SETOWN 407 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 408 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 409 #endif 410 dolog((struct sockaddr *)&his_addr); 411 /* 412 * Set up default state 413 */ 414 data = -1; 415 type = TYPE_A; 416 form = FORM_N; 417 stru = STRU_F; 418 mode = MODE_S; 419 tmpline[0] = '\0'; 420 hasyyerrored = 0; 421 422 #ifdef KERBEROS5 423 kerror = krb5_init_context(&kcontext); 424 if (kerror) { 425 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 426 error_message(kerror)); 427 exit(0); 428 } 429 #endif /* KERBEROS5 */ 430 431 init_curclass(); 432 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 433 curclass.type = CLASS_REAL; 434 435 /* If logins are disabled, print out the message. */ 436 if (display_file(_PATH_NOLOGIN, 530)) { 437 reply(530, "System not available."); 438 exit(0); 439 } 440 (void)display_file(conffilename(_PATH_FTPWELCOME), 220); 441 /* reply(220,) must follow */ 442 reply(220, "%s FTP server (%s) ready.", hostname, FTPD_VERSION); 443 444 (void) setjmp(errcatch); 445 for (;;) 446 (void) yyparse(); 447 /* NOTREACHED */ 448 } 449 450 static void 451 lostconn(int signo) 452 { 453 454 if (debug) 455 syslog(LOG_DEBUG, "lost connection"); 456 dologout(1); 457 } 458 459 /* 460 * Save the result of a getpwnam. Used for USER command, since 461 * the data returned must not be clobbered by any other command 462 * (e.g., globbing). 463 */ 464 static struct passwd * 465 sgetpwnam(const char *name) 466 { 467 static struct passwd save; 468 struct passwd *p; 469 470 if ((p = getpwnam(name)) == NULL) 471 return (p); 472 if (save.pw_name) { 473 free((char *)save.pw_name); 474 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 475 free((char *)save.pw_passwd); 476 free((char *)save.pw_gecos); 477 free((char *)save.pw_dir); 478 free((char *)save.pw_shell); 479 } 480 save = *p; 481 save.pw_name = xstrdup(p->pw_name); 482 save.pw_passwd = xstrdup(p->pw_passwd); 483 save.pw_gecos = xstrdup(p->pw_gecos); 484 save.pw_dir = xstrdup(p->pw_dir); 485 save.pw_shell = xstrdup(p->pw_shell); 486 return (&save); 487 } 488 489 static int login_attempts; /* number of failed login attempts */ 490 static int askpasswd; /* had user command, ask for passwd */ 491 static char curname[10]; /* current USER name */ 492 493 /* 494 * USER command. 495 * Sets global passwd pointer pw if named account exists and is acceptable; 496 * sets askpasswd if a PASS command is expected. If logged in previously, 497 * need to reset state. If name is "ftp" or "anonymous", the name is not in 498 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 499 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 500 * requesting login privileges. Disallow anyone who does not have a standard 501 * shell as returned by getusershell(). Disallow anyone mentioned in the file 502 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 503 */ 504 void 505 user(const char *name) 506 { 507 if (logged_in) { 508 switch (curclass.type) { 509 case CLASS_GUEST: 510 reply(530, "Can't change user from guest login."); 511 return; 512 case CLASS_CHROOT: 513 reply(530, "Can't change user from chroot user."); 514 return; 515 case CLASS_REAL: 516 end_login(); 517 break; 518 default: 519 abort(); 520 } 521 } 522 523 #if defined(KERBEROS) 524 kdestroy(); 525 #endif 526 #if defined(KERBEROS5) 527 k5destroy(); 528 #endif 529 530 curclass.type = CLASS_REAL; 531 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 532 /* need `pw' setup for checkaccess() and checkuser () */ 533 if ((pw = sgetpwnam("ftp")) == NULL) 534 reply(530, "User %s unknown.", name); 535 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 536 reply(530, "User %s access denied.", name); 537 else { 538 curclass.type = CLASS_GUEST; 539 askpasswd = 1; 540 reply(331, 541 "Guest login ok, type your name as password."); 542 } 543 if (!askpasswd && logging) 544 syslog(LOG_NOTICE, 545 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 546 return; 547 } 548 549 pw = sgetpwnam(name); 550 if (logging) 551 strlcpy(curname, name, sizeof(curname)); 552 553 #ifdef SKEY 554 if (skey_haskey(name) == 0) { 555 char *myskey; 556 557 myskey = skey_keyinfo(name); 558 reply(331, "Password [%s] required for %s.", 559 myskey ? myskey : "error getting challenge", name); 560 } else 561 #endif 562 reply(331, "Password required for %s.", name); 563 564 askpasswd = 1; 565 /* 566 * Delay before reading passwd after first failed 567 * attempt to slow down passwd-guessing programs. 568 */ 569 if (login_attempts) 570 sleep((unsigned) login_attempts); 571 } 572 573 /* 574 * Determine whether something is to happen (allow access, chroot) 575 * for a user. Each line is a shell-style glob followed by 576 * `yes' or `no'. 577 * 578 * For backward compatability, `allow' and `deny' are synonymns 579 * for `yes' and `no', respectively. 580 * 581 * Each glob is matched against the username in turn, and the first 582 * match found is used. If no match is found, the result is the 583 * argument `def'. If a match is found but without and explicit 584 * `yes'/`no', the result is the opposite of def. 585 * 586 * If the file doesn't exist at all, the result is the argument 587 * `nofile' 588 * 589 * Any line starting with `#' is considered a comment and ignored. 590 * 591 * Returns 0 if the user is denied, or 1 if they are allowed. 592 * 593 * NOTE: needs struct passwd *pw setup before use. 594 */ 595 int 596 checkuser(const char *fname, const char *name, int def, int nofile, 597 char **retclass) 598 { 599 FILE *fd; 600 int retval; 601 char *glob, *perm, *class, *buf, *p; 602 size_t len, line; 603 604 retval = def; 605 if (retclass != NULL) 606 *retclass = NULL; 607 if ((fd = fopen(conffilename(fname), "r")) == NULL) 608 return nofile; 609 610 line = 0; 611 for (; 612 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 613 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 614 free(buf), buf = NULL) { 615 glob = perm = class = NULL; 616 p = buf; 617 if (len < 1) 618 continue; 619 if (p[len - 1] == '\n') 620 p[--len] = '\0'; 621 if (EMPTYSTR(p)) 622 continue; 623 624 NEXTWORD(p, glob); 625 NEXTWORD(p, perm); 626 NEXTWORD(p, class); 627 if (EMPTYSTR(glob)) 628 continue; 629 if (!EMPTYSTR(class)) { 630 if (strcasecmp(class, "all") == 0 || 631 strcasecmp(class, "none") == 0) { 632 syslog(LOG_WARNING, 633 "%s line %d: illegal user-defined class `%s' - skipping entry", 634 fname, (int)line, class); 635 continue; 636 } 637 } 638 639 /* have a host specifier */ 640 if ((p = strchr(glob, '@')) != NULL) { 641 u_int32_t net, mask, addr; 642 int bits; 643 644 *p++ = '\0'; 645 /* check against network or CIDR */ 646 if (isdigit(*p) && 647 (bits = inet_net_pton(AF_INET, p, 648 &net, sizeof(net))) != -1) { 649 net = ntohl(net); 650 mask = 0xffffffffU << (32 - bits); 651 addr = ntohl(his_addr.su_sin.sin_addr.s_addr); 652 if ((addr & mask) != net) 653 continue; 654 655 /* check against hostname glob */ 656 } else if (fnmatch(p, remotehost, 0) != 0) 657 continue; 658 } 659 660 /* have a group specifier */ 661 if ((p = strchr(glob, ':')) != NULL) { 662 gid_t *groups, *ng; 663 int gsize, i, found; 664 665 *p++ = '\0'; 666 groups = NULL; 667 gsize = 16; 668 do { 669 ng = realloc(groups, gsize * sizeof(gid_t)); 670 if (ng == NULL) 671 fatal( 672 "Local resource failure: realloc"); 673 groups = ng; 674 } while (getgrouplist(pw->pw_name, pw->pw_gid, 675 groups, &gsize) == -1); 676 found = 0; 677 for (i = 0; i < gsize; i++) { 678 struct group *g; 679 680 if ((g = getgrgid(groups[i])) == NULL) 681 continue; 682 if (fnmatch(p, g->gr_name, 0) == 0) { 683 found = 1; 684 break; 685 } 686 } 687 free(groups); 688 if (!found) 689 continue; 690 } 691 692 /* check against username glob */ 693 if (fnmatch(glob, name, 0) != 0) 694 continue; 695 696 if (perm != NULL && 697 ((strcasecmp(perm, "allow") == 0) || 698 (strcasecmp(perm, "yes") == 0))) 699 retval = 1; 700 else if (perm != NULL && 701 ((strcasecmp(perm, "deny") == 0) || 702 (strcasecmp(perm, "no") == 0))) 703 retval = 0; 704 else 705 retval = !def; 706 if (!EMPTYSTR(class) && retclass != NULL) 707 *retclass = xstrdup(class); 708 free(buf); 709 break; 710 } 711 (void) fclose(fd); 712 return (retval); 713 } 714 715 /* 716 * Check if user is allowed by /etc/ftpusers 717 * returns 1 for yes, 0 for no 718 * 719 * NOTE: needs struct passwd *pw setup (for checkuser()) 720 */ 721 int 722 checkaccess(const char *name) 723 { 724 725 return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL)); 726 } 727 728 /* 729 * Terminate login as previous user, if any, resetting state; 730 * used when USER command is given or login fails. 731 */ 732 static void 733 end_login(void) 734 { 735 736 (void) seteuid((uid_t)0); 737 if (logged_in) { 738 logwtmp(ttyline, "", ""); 739 if (doutmp) 740 logout(utmp.ut_line); 741 } 742 pw = NULL; 743 logged_in = 0; 744 quietmessages = 0; 745 gidcount = 0; 746 curclass.type = CLASS_REAL; 747 } 748 749 void 750 pass(const char *passwd) 751 { 752 int rval; 753 const char *cp, *shell; 754 char *class, root[MAXPATHLEN]; 755 756 class = NULL; 757 if (logged_in || askpasswd == 0) { 758 reply(503, "Login with USER first."); 759 return; 760 } 761 askpasswd = 0; 762 if (curclass.type != CLASS_GUEST) { 763 /* "ftp" is only account allowed no password */ 764 if (pw == NULL) { 765 rval = 1; /* failure below */ 766 goto skip; 767 } 768 #if defined(KERBEROS) 769 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 770 rval = 0; 771 goto skip; 772 } 773 #endif 774 #if defined(KERBEROS5) 775 if (k5login(pw, "", hostname, (char *)passwd) == 0) { 776 rval = 0; 777 goto skip; 778 } 779 #endif 780 #ifdef SKEY 781 if (skey_haskey(pw->pw_name) == 0) { 782 char *p; 783 int r; 784 785 p = xstrdup(passwd); 786 r = skey_passcheck(pw->pw_name, p); 787 free(p); 788 if (r != -1) { 789 rval = 0; 790 goto skip; 791 } 792 } 793 #endif 794 if (!sflag && *pw->pw_passwd != '\0' && 795 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 796 rval = 0; 797 goto skip; 798 } 799 rval = 1; 800 801 skip: 802 if (pw != NULL && pw->pw_expire && time(NULL) >= pw->pw_expire) 803 rval = 2; 804 /* 805 * If rval > 0, the user failed the authentication check 806 * above. If rval == 0, either Kerberos or local authentication 807 * succeeded. 808 */ 809 if (rval) { 810 reply(530, "%s", rval == 2 ? "Password expired." : 811 "Login incorrect."); 812 if (logging) { 813 syslog(LOG_NOTICE, 814 "FTP LOGIN FAILED FROM %s", remotehost); 815 syslog(LOG_AUTHPRIV | LOG_NOTICE, 816 "FTP LOGIN FAILED FROM %s, %s", 817 remotehost, curname); 818 } 819 pw = NULL; 820 if (login_attempts++ >= 5) { 821 syslog(LOG_NOTICE, 822 "repeated login failures from %s", 823 remotehost); 824 exit(0); 825 } 826 return; 827 } 828 } 829 830 /* password was ok; see if anything else prevents login */ 831 if (! checkuser(_PATH_FTPUSERS, pw->pw_name, 1, 0, &class)) { 832 reply(530, "User %s may not use FTP.", pw->pw_name); 833 if (logging) 834 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 835 remotehost, pw->pw_name); 836 goto bad; 837 } 838 /* check for valid shell, if not guest user */ 839 if ((shell = pw->pw_shell) == NULL || *shell == 0) 840 shell = _PATH_BSHELL; 841 while ((cp = getusershell()) != NULL) 842 if (strcmp(cp, shell) == 0) 843 break; 844 endusershell(); 845 if (cp == NULL && curclass.type != CLASS_GUEST) { 846 reply(530, "User %s may not use FTP.", pw->pw_name); 847 if (logging) 848 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 849 remotehost, pw->pw_name); 850 goto bad; 851 } 852 853 login_attempts = 0; /* this time successful */ 854 if (setegid((gid_t)pw->pw_gid) < 0) { 855 reply(550, "Can't set gid."); 856 goto bad; 857 } 858 (void) initgroups(pw->pw_name, pw->pw_gid); 859 gidcount = getgroups(sizeof(gidlist), gidlist); 860 861 /* open wtmp before chroot */ 862 logwtmp(ttyline, pw->pw_name, remotehost); 863 864 /* open utmp before chroot */ 865 if (doutmp) { 866 memset((void *)&utmp, 0, sizeof(utmp)); 867 (void)time(&utmp.ut_time); 868 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 869 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 870 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 871 login(&utmp); 872 } 873 874 logged_in = 1; 875 876 /* check user in /etc/ftpchroot */ 877 if (checkuser(_PATH_FTPCHROOT, pw->pw_name, 0, 0, NULL)) { 878 if (curclass.type == CLASS_GUEST) { 879 syslog(LOG_NOTICE, 880 "Can't change guest user to chroot class; remove entry in %s", 881 _PATH_FTPCHROOT); 882 exit(1); 883 } 884 curclass.type = CLASS_CHROOT; 885 } 886 if (class == NULL) { 887 switch (curclass.type) { 888 case CLASS_GUEST: 889 class = xstrdup("guest"); 890 break; 891 case CLASS_CHROOT: 892 class = xstrdup("chroot"); 893 break; 894 case CLASS_REAL: 895 class = xstrdup("real"); 896 break; 897 default: 898 abort(); 899 } 900 } 901 902 /* parse ftpd.conf, setting up various parameters */ 903 parse_conf(class); 904 count_users(); 905 if (curclass.limit != -1 && connections > curclass.limit) { 906 if (! EMPTYSTR(curclass.limitfile)) 907 (void)display_file(conffilename(curclass.limitfile), 908 530); 909 reply(530, 910 "User %s access denied, connection limit of %d reached.", 911 pw->pw_name, curclass.limit); 912 syslog(LOG_NOTICE, 913 "Maximum connection limit of %d for class %s reached, login refused for %s", 914 curclass.limit, curclass.classname, pw->pw_name); 915 goto bad; 916 } 917 918 homedir[0] = '/'; 919 switch (curclass.type) { 920 case CLASS_GUEST: 921 /* 922 * We MUST do a chdir() after the chroot. Otherwise 923 * the old current directory will be accessible as "." 924 * outside the new root! 925 */ 926 format_path(root, 927 curclass.chroot ? curclass.chroot : 928 anondir ? anondir : 929 pw->pw_dir); 930 format_path(homedir, 931 curclass.homedir ? curclass.homedir : 932 "/"); 933 if (EMPTYSTR(homedir)) 934 homedir[0] = '/'; 935 if (EMPTYSTR(root) || chroot(root) < 0) { 936 syslog(LOG_NOTICE, 937 "GUEST user %s: can't chroot to %s: %m", 938 pw->pw_name, root); 939 goto bad_guest; 940 } 941 if (chdir(homedir) < 0) { 942 syslog(LOG_NOTICE, 943 "GUEST user %s: can't chdir to %s: %m", 944 pw->pw_name, homedir); 945 bad_guest: 946 reply(550, "Can't set guest privileges."); 947 goto bad; 948 } 949 break; 950 case CLASS_CHROOT: 951 format_path(root, 952 curclass.chroot ? curclass.chroot : 953 pw->pw_dir); 954 format_path(homedir, 955 curclass.homedir ? curclass.homedir : 956 "/"); 957 if (EMPTYSTR(homedir)) 958 homedir[0] = '/'; 959 if (EMPTYSTR(root) || chroot(root) < 0) { 960 syslog(LOG_NOTICE, 961 "CHROOT user %s: can't chroot to %s: %m", 962 pw->pw_name, root); 963 goto bad_chroot; 964 } 965 if (chdir(homedir) < 0) { 966 syslog(LOG_NOTICE, 967 "CHROOT user %s: can't chdir to %s: %m", 968 pw->pw_name, homedir); 969 bad_chroot: 970 reply(550, "Can't change root."); 971 goto bad; 972 } 973 break; 974 case CLASS_REAL: 975 format_path(homedir, 976 curclass.homedir ? curclass.homedir : 977 pw->pw_dir); 978 if (EMPTYSTR(homedir) || chdir(homedir) < 0) { 979 if (chdir("/") < 0) { 980 syslog(LOG_NOTICE, 981 "REAL user %s: can't chdir to %s: %m", 982 pw->pw_name, 983 !EMPTYSTR(homedir) ? homedir : "/"); 984 reply(530, 985 "User %s: can't change directory to %s.", 986 pw->pw_name, 987 !EMPTYSTR(homedir) ? homedir : "/"); 988 goto bad; 989 } else { 990 reply(-230, 991 "No directory! Logging in with home=/"); 992 homedir[0] = '/'; 993 } 994 } 995 break; 996 } 997 if (seteuid((uid_t)pw->pw_uid) < 0) { 998 reply(550, "Can't set uid."); 999 goto bad; 1000 } 1001 setenv("HOME", homedir, 1); 1002 1003 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 1004 quietmessages = 1; 1005 1006 /* 1007 * Display a login message, if it exists. 1008 * N.B. reply(230,) must follow the message. 1009 */ 1010 (void)display_file(conffilename(curclass.motd), 230); 1011 show_chdir_messages(230); 1012 if (curclass.type == CLASS_GUEST) { 1013 reply(230, "Guest login ok, access restrictions apply."); 1014 #ifdef HASSETPROCTITLE 1015 snprintf(proctitle, sizeof(proctitle), 1016 "%s: anonymous/%.*s", remotehost, 1017 (int) (sizeof(proctitle) - sizeof(remotehost) - 1018 sizeof(": anonymous/")), passwd); 1019 setproctitle("%s", proctitle); 1020 #endif /* HASSETPROCTITLE */ 1021 if (logging) 1022 syslog(LOG_INFO, 1023 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 1024 remotehost, passwd, 1025 curclass.classname, CURCLASSTYPE); 1026 } else { 1027 reply(230, "User %s logged in.", pw->pw_name); 1028 #ifdef HASSETPROCTITLE 1029 snprintf(proctitle, sizeof(proctitle), 1030 "%s: %s", remotehost, pw->pw_name); 1031 setproctitle("%s", proctitle); 1032 #endif /* HASSETPROCTITLE */ 1033 if (logging) 1034 syslog(LOG_INFO, 1035 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1036 remotehost, pw->pw_name, 1037 curclass.classname, CURCLASSTYPE); 1038 } 1039 (void) umask(curclass.umask); 1040 goto cleanuppass; 1041 bad: 1042 /* Forget all about it... */ 1043 end_login(); 1044 cleanuppass: 1045 if (class) 1046 free(class); 1047 } 1048 1049 void 1050 retrieve(char *argv[], const char *name) 1051 { 1052 FILE *fin, *dout; 1053 struct stat st; 1054 int (*closefunc)(FILE *) = NULL; 1055 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1056 struct timeval start, finish, td, *tdp; 1057 const char *dispname; 1058 1059 sendrv = closerv = stderrfd = -1; 1060 isconversion = isdata = isls = log = 0; 1061 tdp = NULL; 1062 dispname = name; 1063 fin = dout = NULL; 1064 if (argv == NULL) { 1065 log = 1; 1066 isdata = 1; 1067 fin = fopen(name, "r"); 1068 closefunc = fclose; 1069 if (fin == NULL) 1070 argv = do_conversion(name); 1071 if (argv != NULL) { 1072 isconversion++; 1073 syslog(LOG_INFO, "get command: '%s' on '%s'", 1074 argv[0], name); 1075 } 1076 } 1077 if (argv != NULL) { 1078 char temp[MAXPATHLEN]; 1079 1080 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1081 isls = 1; 1082 stderrfd = -1; 1083 } else { 1084 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1085 stderrfd = mkstemp(temp); 1086 if (stderrfd != -1) 1087 (void)unlink(temp); 1088 } 1089 dispname = argv[0]; 1090 fin = ftpd_popen(argv, "r", stderrfd); 1091 closefunc = ftpd_pclose; 1092 st.st_size = -1; 1093 st.st_blksize = BUFSIZ; 1094 } 1095 if (fin == NULL) { 1096 if (errno != 0) { 1097 perror_reply(550, dispname); 1098 if (log) 1099 logcmd("get", -1, name, NULL, NULL, 1100 strerror(errno)); 1101 } 1102 goto cleanupretrieve; 1103 } 1104 byte_count = -1; 1105 if (argv == NULL 1106 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1107 reply(550, "%s: not a plain file.", dispname); 1108 goto done; 1109 } 1110 if (restart_point) { 1111 if (type == TYPE_A) { 1112 off_t i; 1113 int c; 1114 1115 for (i = 0; i < restart_point; i++) { 1116 if ((c=getc(fin)) == EOF) { 1117 perror_reply(550, dispname); 1118 goto done; 1119 } 1120 if (c == '\n') 1121 i++; 1122 } 1123 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1124 perror_reply(550, dispname); 1125 goto done; 1126 } 1127 } 1128 dout = dataconn(dispname, st.st_size, "w"); 1129 if (dout == NULL) 1130 goto done; 1131 1132 (void)gettimeofday(&start, NULL); 1133 sendrv = send_data(fin, dout, st.st_blksize, isdata); 1134 (void)gettimeofday(&finish, NULL); 1135 (void) fclose(dout); /* close now to affect timing stats */ 1136 dout = NULL; 1137 timersub(&finish, &start, &td); 1138 tdp = &td; 1139 done: 1140 if (log) 1141 logcmd("get", byte_count, name, NULL, tdp, NULL); 1142 closerv = (*closefunc)(fin); 1143 if (sendrv == 0) { 1144 FILE *err; 1145 struct stat sb; 1146 1147 if (!isls && argv != NULL && closerv != 0) { 1148 reply(-226, 1149 "Command returned an exit status of %d", 1150 closerv); 1151 if (isconversion) 1152 syslog(LOG_INFO, 1153 "retrieve command: '%s' returned %d", 1154 argv[0], closerv); 1155 } 1156 if (!isls && argv != NULL && stderrfd != -1 && 1157 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1158 ((err = fdopen(stderrfd, "r")) != NULL)) { 1159 char *cp, line[LINE_MAX]; 1160 1161 reply(-226, "Command error messages:"); 1162 rewind(err); 1163 while (fgets(line, sizeof(line), err) != NULL) { 1164 if ((cp = strchr(line, '\n')) != NULL) 1165 *cp = '\0'; 1166 reply(0, " %s", line); 1167 } 1168 (void) fflush(stdout); 1169 (void) fclose(err); 1170 /* a reply(226,) must follow */ 1171 } 1172 reply(226, "Transfer complete."); 1173 } 1174 cleanupretrieve: 1175 closedataconn(dout); 1176 if (stderrfd != -1) 1177 (void)close(stderrfd); 1178 if (isconversion) 1179 free(argv); 1180 } 1181 1182 void 1183 store(const char *name, const char *mode, int unique) 1184 { 1185 FILE *fout, *din; 1186 struct stat st; 1187 int (*closefunc)(FILE *); 1188 struct timeval start, finish, td, *tdp; 1189 char *desc; 1190 1191 din = NULL; 1192 desc = (*mode == 'w') ? "put" : "append"; 1193 if (unique && stat(name, &st) == 0 && 1194 (name = gunique(name)) == NULL) { 1195 logcmd(desc, -1, name, NULL, NULL, "cannot create unique file"); 1196 goto cleanupstore; 1197 } 1198 1199 if (restart_point) 1200 mode = "r+"; 1201 fout = fopen(name, mode); 1202 closefunc = fclose; 1203 tdp = NULL; 1204 if (fout == NULL) { 1205 perror_reply(553, name); 1206 logcmd(desc, -1, name, NULL, NULL, strerror(errno)); 1207 goto cleanupstore; 1208 } 1209 byte_count = -1; 1210 if (restart_point) { 1211 if (type == TYPE_A) { 1212 off_t i; 1213 int c; 1214 1215 for (i = 0; i < restart_point; i++) { 1216 if ((c=getc(fout)) == EOF) { 1217 perror_reply(550, name); 1218 goto done; 1219 } 1220 if (c == '\n') 1221 i++; 1222 } 1223 /* 1224 * We must do this seek to "current" position 1225 * because we are changing from reading to 1226 * writing. 1227 */ 1228 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1229 perror_reply(550, name); 1230 goto done; 1231 } 1232 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1233 perror_reply(550, name); 1234 goto done; 1235 } 1236 } 1237 din = dataconn(name, (off_t)-1, "r"); 1238 if (din == NULL) 1239 goto done; 1240 (void)gettimeofday(&start, NULL); 1241 if (receive_data(din, fout) == 0) { 1242 if (unique) 1243 reply(226, "Transfer complete (unique file name:%s).", 1244 name); 1245 else 1246 reply(226, "Transfer complete."); 1247 } 1248 (void)gettimeofday(&finish, NULL); 1249 (void) fclose(din); /* close now to affect timing stats */ 1250 din = NULL; 1251 timersub(&finish, &start, &td); 1252 tdp = &td; 1253 done: 1254 logcmd(desc, byte_count, name, NULL, tdp, NULL); 1255 (*closefunc)(fout); 1256 cleanupstore: 1257 closedataconn(din); 1258 } 1259 1260 static FILE * 1261 getdatasock(const char *mode) 1262 { 1263 int on = 1, s, t, tries; 1264 1265 if (data >= 0) 1266 return (fdopen(data, mode)); 1267 (void) seteuid((uid_t)0); 1268 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1269 if (s < 0) 1270 goto bad; 1271 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1272 (char *) &on, sizeof(on)) < 0) 1273 goto bad; 1274 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1275 (char *) &on, sizeof(on)) < 0) 1276 goto bad; 1277 /* anchor socket to avoid multi-homing problems */ 1278 data_source = ctrl_addr; 1279 data_source.su_port = htons(20); /* ftp-data port */ 1280 for (tries = 1; ; tries++) { 1281 if (bind(s, (struct sockaddr *)&data_source, 1282 data_source.su_len) >= 0) 1283 break; 1284 if (errno != EADDRINUSE || tries > 10) 1285 goto bad; 1286 sleep(tries); 1287 } 1288 (void) seteuid((uid_t)pw->pw_uid); 1289 #ifdef IP_TOS 1290 if (!mapped && ctrl_addr.su_family == AF_INET) { 1291 on = IPTOS_THROUGHPUT; 1292 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1293 sizeof(int)) < 0) 1294 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1295 } 1296 #endif 1297 return (fdopen(s, mode)); 1298 bad: 1299 /* Return the real value of errno (close may change it) */ 1300 t = errno; 1301 (void) seteuid((uid_t)pw->pw_uid); 1302 (void) close(s); 1303 errno = t; 1304 return (NULL); 1305 } 1306 1307 FILE * 1308 dataconn(const char *name, off_t size, const char *mode) 1309 { 1310 char sizebuf[32]; 1311 FILE *file; 1312 int retry = 0, tos, keepalive; 1313 1314 file_size = size; 1315 byte_count = 0; 1316 if (size != (off_t) -1) 1317 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd byte%s)", 1318 (qdfmt_t)size, PLURAL(size)); 1319 else 1320 sizebuf[0] = '\0'; 1321 if (pdata >= 0) { 1322 union sockunion from; 1323 int s, fromlen = sizeof(from); 1324 1325 (void) alarm(curclass.timeout); 1326 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1327 (void) alarm(0); 1328 if (s < 0) { 1329 reply(425, "Can't open data connection."); 1330 (void) close(pdata); 1331 pdata = -1; 1332 return (NULL); 1333 } 1334 (void) close(pdata); 1335 pdata = s; 1336 switch (from.su_family) { 1337 case AF_INET: 1338 #ifdef IP_TOS 1339 if (!mapped) { 1340 tos = IPTOS_THROUGHPUT; 1341 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1342 (char *)&tos, sizeof(int)); 1343 } 1344 break; 1345 #endif 1346 } 1347 /* Set keepalives on the socket to detect dropped conns. */ 1348 #ifdef SO_KEEPALIVE 1349 keepalive = 1; 1350 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1351 (char *)&keepalive, sizeof(int)); 1352 #endif 1353 reply(150, "Opening %s mode data connection for '%s'%s.", 1354 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1355 return (fdopen(pdata, mode)); 1356 } 1357 if (data >= 0) { 1358 reply(125, "Using existing data connection for '%s'%s.", 1359 name, sizebuf); 1360 usedefault = 1; 1361 return (fdopen(data, mode)); 1362 } 1363 if (usedefault) 1364 data_dest = his_addr; 1365 usedefault = 1; 1366 file = getdatasock(mode); 1367 if (file == NULL) { 1368 char hbuf[INET6_ADDRSTRLEN]; 1369 char pbuf[10]; 1370 getnameinfo((struct sockaddr *)&data_source, data_source.su_len, 1371 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1372 NI_NUMERICHOST | NI_NUMERICSERV); 1373 reply(425, "Can't create data socket (%s,%s): %s.", 1374 hbuf, pbuf, strerror(errno)); 1375 return (NULL); 1376 } 1377 data = fileno(file); 1378 while (connect(data, (struct sockaddr *)&data_dest, 1379 data_dest.su_len) < 0) { 1380 if (errno == EADDRINUSE && retry < swaitmax) { 1381 sleep((unsigned) swaitint); 1382 retry += swaitint; 1383 continue; 1384 } 1385 perror_reply(425, "Can't build data connection"); 1386 (void) fclose(file); 1387 data = -1; 1388 return (NULL); 1389 } 1390 reply(150, "Opening %s mode data connection for '%s'%s.", 1391 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1392 return (file); 1393 } 1394 1395 void 1396 closedataconn(FILE *fd) 1397 { 1398 1399 if (fd != NULL) 1400 (void)fclose(fd); 1401 data = -1; 1402 if (pdata >= 0) 1403 (void)close(pdata); 1404 pdata = -1; 1405 } 1406 1407 /* 1408 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1409 * encapsulation of the data subject * to Mode, Structure, and Type. 1410 * 1411 * NB: Form isn't handled. 1412 */ 1413 static int 1414 send_data(FILE *instr, FILE *outstr, off_t blksize, int isdata) 1415 { 1416 int c, filefd, netfd, rval; 1417 char *buf; 1418 1419 transflag = 1; 1420 rval = -1; 1421 buf = NULL; 1422 if (setjmp(urgcatch)) 1423 goto cleanup_send_data; 1424 1425 switch (type) { 1426 1427 case TYPE_A: 1428 /* XXXX: rate limit ascii send (get) */ 1429 (void) alarm(curclass.timeout); 1430 while ((c = getc(instr)) != EOF) { 1431 byte_count++; 1432 if (c == '\n') { 1433 if (ferror(outstr)) 1434 goto data_err; 1435 (void) putc('\r', outstr); 1436 if (isdata) { 1437 total_data_out++; 1438 total_data++; 1439 } 1440 total_bytes_out++; 1441 total_bytes++; 1442 } 1443 (void) putc(c, outstr); 1444 if (isdata) { 1445 total_data_out++; 1446 total_data++; 1447 } 1448 total_bytes_out++; 1449 total_bytes++; 1450 if ((byte_count % 4096) == 0) 1451 (void) alarm(curclass.timeout); 1452 } 1453 (void) alarm(0); 1454 fflush(outstr); 1455 if (ferror(instr)) 1456 goto file_err; 1457 if (ferror(outstr)) 1458 goto data_err; 1459 rval = 0; 1460 goto cleanup_send_data; 1461 1462 case TYPE_I: 1463 case TYPE_L: 1464 if ((buf = malloc((size_t)blksize)) == NULL) { 1465 perror_reply(451, "Local resource failure: malloc"); 1466 goto cleanup_send_data; 1467 } 1468 filefd = fileno(instr); 1469 netfd = fileno(outstr); 1470 (void) alarm(curclass.timeout); 1471 if (curclass.rateget) { 1472 while (1) { 1473 int d; 1474 struct timeval then, now, td; 1475 off_t bufrem; 1476 char *bufp; 1477 1478 (void)gettimeofday(&then, NULL); 1479 errno = c = d = 0; 1480 bufrem = curclass.rateget; 1481 while (bufrem > 0) { 1482 if ((c = read(filefd, buf, 1483 MIN(blksize, bufrem))) <= 0) 1484 goto senddone; 1485 (void) alarm(curclass.timeout); 1486 bufrem -= c; 1487 byte_count += c; 1488 if (isdata) { 1489 total_data_out += c; 1490 total_data += c; 1491 } 1492 total_bytes_out += c; 1493 total_bytes += c; 1494 for (bufp = buf; c > 0; 1495 c -= d, bufp += d) 1496 if ((d = 1497 write(netfd, bufp, c)) <= 0) 1498 break; 1499 if (d < 0) 1500 goto data_err; 1501 } 1502 (void)gettimeofday(&now, NULL); 1503 timersub(&now, &then, &td); 1504 if (td.tv_sec == 0) 1505 usleep(1000000 - td.tv_usec); 1506 } 1507 } else { 1508 while ((c = read(filefd, buf, (size_t)blksize)) > 0) { 1509 if (write(netfd, buf, c) != c) 1510 goto data_err; 1511 (void) alarm(curclass.timeout); 1512 byte_count += c; 1513 if (isdata) { 1514 total_data_out += c; 1515 total_data += c; 1516 } 1517 total_bytes_out += c; 1518 total_bytes += c; 1519 } 1520 } 1521 senddone: 1522 if (c < 0) 1523 goto file_err; 1524 rval = 0; 1525 goto cleanup_send_data; 1526 1527 default: 1528 reply(550, "Unimplemented TYPE %d in send_data", type); 1529 goto cleanup_send_data; 1530 } 1531 1532 data_err: 1533 (void) alarm(0); 1534 perror_reply(426, "Data connection"); 1535 goto cleanup_send_data; 1536 1537 file_err: 1538 (void) alarm(0); 1539 perror_reply(551, "Error on input file"); 1540 /* FALLTHROUGH */ 1541 1542 cleanup_send_data: 1543 (void) alarm(0); 1544 transflag = 0; 1545 if (buf) 1546 free(buf); 1547 if (isdata) { 1548 total_files_out++; 1549 total_files++; 1550 } 1551 total_xfers_out++; 1552 total_xfers++; 1553 return (rval); 1554 } 1555 1556 /* 1557 * Transfer data from peer to "outstr" using the appropriate encapulation of 1558 * the data subject to Mode, Structure, and Type. 1559 * 1560 * N.B.: Form isn't handled. 1561 */ 1562 static int 1563 receive_data(FILE *instr, FILE *outstr) 1564 { 1565 int c, bare_lfs, netfd, filefd, rval; 1566 char buf[BUFSIZ]; 1567 #ifdef __GNUC__ 1568 (void) &bare_lfs; 1569 #endif 1570 1571 bare_lfs = 0; 1572 transflag = 1; 1573 rval = -1; 1574 if (setjmp(urgcatch)) 1575 goto cleanup_recv_data; 1576 1577 switch (type) { 1578 1579 case TYPE_I: 1580 case TYPE_L: 1581 netfd = fileno(instr); 1582 filefd = fileno(outstr); 1583 (void) alarm(curclass.timeout); 1584 if (curclass.rateput) { 1585 while (1) { 1586 int d; 1587 struct timeval then, now, td; 1588 off_t bufrem; 1589 1590 (void)gettimeofday(&then, NULL); 1591 errno = c = d = 0; 1592 for (bufrem = curclass.rateput; bufrem > 0; ) { 1593 if ((c = read(netfd, buf, 1594 MIN(sizeof(buf), bufrem))) <= 0) 1595 goto recvdone; 1596 if ((d = write(filefd, buf, c)) != c) 1597 goto recvdone; 1598 (void) alarm(curclass.timeout); 1599 bufrem -= c; 1600 byte_count += c; 1601 total_data_in += c; 1602 total_data += c; 1603 total_bytes_in += c; 1604 total_bytes += c; 1605 } 1606 (void)gettimeofday(&now, NULL); 1607 timersub(&now, &then, &td); 1608 if (td.tv_sec == 0) 1609 usleep(1000000 - td.tv_usec); 1610 } 1611 } else { 1612 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1613 if (write(filefd, buf, c) != c) 1614 goto file_err; 1615 (void) alarm(curclass.timeout); 1616 byte_count += c; 1617 total_data_in += c; 1618 total_data += c; 1619 total_bytes_in += c; 1620 total_bytes += c; 1621 } 1622 } 1623 recvdone: 1624 if (c < 0) 1625 goto data_err; 1626 rval = 0; 1627 goto cleanup_recv_data; 1628 1629 case TYPE_E: 1630 reply(553, "TYPE E not implemented."); 1631 goto cleanup_recv_data; 1632 1633 case TYPE_A: 1634 (void) alarm(curclass.timeout); 1635 /* XXXX: rate limit ascii receive (put) */ 1636 while ((c = getc(instr)) != EOF) { 1637 byte_count++; 1638 total_data_in++; 1639 total_data++; 1640 total_bytes_in++; 1641 total_bytes++; 1642 if ((byte_count % 4096) == 0) 1643 (void) alarm(curclass.timeout); 1644 if (c == '\n') 1645 bare_lfs++; 1646 while (c == '\r') { 1647 if (ferror(outstr)) 1648 goto data_err; 1649 if ((c = getc(instr)) != '\n') { 1650 byte_count++; 1651 total_data_in++; 1652 total_data++; 1653 total_bytes_in++; 1654 total_bytes++; 1655 if ((byte_count % 4096) == 0) 1656 (void) alarm(curclass.timeout); 1657 (void) putc ('\r', outstr); 1658 if (c == '\0' || c == EOF) 1659 goto contin2; 1660 } 1661 } 1662 (void) putc(c, outstr); 1663 contin2: ; 1664 } 1665 (void) alarm(0); 1666 fflush(outstr); 1667 if (ferror(instr)) 1668 goto data_err; 1669 if (ferror(outstr)) 1670 goto file_err; 1671 if (bare_lfs) { 1672 reply(-226, 1673 "WARNING! %d bare linefeeds received in ASCII mode", 1674 bare_lfs); 1675 reply(0, "File may not have transferred correctly."); 1676 } 1677 rval = 0; 1678 goto cleanup_recv_data; 1679 1680 default: 1681 reply(550, "Unimplemented TYPE %d in receive_data", type); 1682 goto cleanup_recv_data; 1683 } 1684 1685 data_err: 1686 (void) alarm(0); 1687 perror_reply(426, "Data Connection"); 1688 goto cleanup_recv_data; 1689 1690 file_err: 1691 (void) alarm(0); 1692 perror_reply(452, "Error writing file"); 1693 goto cleanup_recv_data; 1694 1695 cleanup_recv_data: 1696 (void) alarm(0); 1697 transflag = 0; 1698 total_files_in++; 1699 total_files++; 1700 total_xfers_in++; 1701 total_xfers++; 1702 return (rval); 1703 } 1704 1705 void 1706 statcmd(void) 1707 { 1708 union sockunion *su = NULL; 1709 static char ntop_buf[INET6_ADDRSTRLEN]; 1710 u_char *a, *p; 1711 int ispassive, af; 1712 off_t otbi, otbo, otb; 1713 1714 a = p = (u_char *)NULL; 1715 1716 reply(-211, "%s FTP server status:", hostname); 1717 reply(0, "Version: %s", FTPD_VERSION); 1718 ntop_buf[0] = '\0'; 1719 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1720 ntop_buf, sizeof(ntop_buf), NULL, 0, NI_NUMERICHOST) 1721 && strcmp(remotehost, ntop_buf) != 0) { 1722 reply(0, "Connected to %s (%s)", remotehost, ntop_buf); 1723 } else 1724 reply(0, "Connected to %s", remotehost); 1725 if (logged_in) { 1726 if (curclass.type == CLASS_GUEST) 1727 reply(0, "Logged in anonymously"); 1728 else 1729 reply(0, "Logged in as %s%s", pw->pw_name, 1730 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 1731 } else if (askpasswd) 1732 reply(0, "Waiting for password"); 1733 else 1734 reply(0, "Waiting for user name"); 1735 cprintf(stdout, " TYPE: %s", typenames[type]); 1736 if (type == TYPE_A || type == TYPE_E) 1737 cprintf(stdout, ", FORM: %s", formnames[form]); 1738 if (type == TYPE_L) { 1739 #if NBBY == 8 1740 cprintf(stdout, " %d", NBBY); 1741 #else 1742 /* XXX: `bytesize' needs to be defined in this case */ 1743 cprintf(stdout, " %d", bytesize); 1744 #endif 1745 } 1746 cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n", 1747 strunames[stru], modenames[mode]); 1748 ispassive = 0; 1749 if (data != -1) { 1750 reply(0, "Data connection open"); 1751 su = NULL; 1752 } else if (pdata != -1) { 1753 reply(0, "in Passive mode"); 1754 su = (union sockunion *)&pasv_addr; 1755 ispassive = 1; 1756 goto printaddr; 1757 } else if (usedefault == 0) { 1758 if (epsvall) { 1759 reply(0, "EPSV only mode (EPSV ALL)"); 1760 goto epsvonly; 1761 } 1762 su = (union sockunion *)&data_dest; 1763 printaddr: 1764 /* PASV/PORT */ 1765 if (su->su_family == AF_INET) { 1766 a = (u_char *) &su->su_sin.sin_addr; 1767 p = (u_char *) &su->su_sin.sin_port; 1768 #define UC(b) (((int) b) & 0xff) 1769 reply(0, "%s (%d,%d,%d,%d,%d,%d)", 1770 ispassive ? "PASV" : "PORT" , 1771 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1772 UC(p[0]), UC(p[1])); 1773 } 1774 1775 /* LPSV/LPRT */ 1776 { 1777 int alen, af, i; 1778 1779 alen = 0; 1780 switch (su->su_family) { 1781 case AF_INET: 1782 a = (u_char *) &su->su_sin.sin_addr; 1783 p = (u_char *) &su->su_sin.sin_port; 1784 alen = sizeof(su->su_sin.sin_addr); 1785 af = 4; 1786 break; 1787 case AF_INET6: 1788 a = (u_char *) &su->su_sin6.sin6_addr; 1789 p = (u_char *) &su->su_sin6.sin6_port; 1790 alen = sizeof(su->su_sin6.sin6_addr); 1791 af = 6; 1792 break; 1793 default: 1794 af = 0; 1795 break; 1796 } 1797 if (af) { 1798 cprintf(stdout, " %s (%d,%d", 1799 ispassive ? "LPSV" : "LPRT", af, alen); 1800 for (i = 0; i < alen; i++) 1801 cprintf(stdout, ",%d", UC(a[i])); 1802 cprintf(stdout, ",%d,%d,%d)", 2, UC(p[0]), UC(p[1])); 1803 #undef UC 1804 } 1805 } 1806 1807 /* EPRT/EPSV */ 1808 epsvonly: 1809 switch (su->su_family) { 1810 case AF_INET: 1811 af = 1; 1812 break; 1813 case AF_INET6: 1814 af = 2; 1815 break; 1816 default: 1817 af = 0; 1818 break; 1819 } 1820 if (af) { 1821 if (getnameinfo((struct sockaddr *)su, su->su_len, 1822 ntop_buf, sizeof(ntop_buf), NULL, 0, 1823 NI_NUMERICHOST) == 0) { 1824 reply(0, "%s (|%d|%s|%d|)", 1825 ispassive ? "EPSV" : "EPRT", 1826 af, ntop_buf, ntohs(su->su_port)); 1827 } 1828 } 1829 } else 1830 reply(0, "No data connection"); 1831 1832 if (logged_in) { 1833 reply(0, "Data sent: %qd byte%s in %qd file%s", 1834 (qdfmt_t)total_data_out, PLURAL(total_data_out), 1835 (qdfmt_t)total_files_out, PLURAL(total_files_out)); 1836 reply(0, "Data received: %qd byte%s in %qd file%s", 1837 (qdfmt_t)total_data_in, PLURAL(total_data_in), 1838 (qdfmt_t)total_files_in, PLURAL(total_files_in)); 1839 reply(0, "Total data: %qd byte%s in %qd file%s", 1840 (qdfmt_t)total_data, PLURAL(total_data), 1841 (qdfmt_t)total_files, PLURAL(total_files)); 1842 } 1843 otbi = total_bytes_in; 1844 otbo = total_bytes_out; 1845 otb = total_bytes; 1846 reply(0, "Traffic sent: %qd byte%s in %qd transfer%s", 1847 (qdfmt_t)otbo, PLURAL(otbo), 1848 (qdfmt_t)total_xfers_out, PLURAL(total_xfers_out)); 1849 reply(0, "Traffic received: %qd byte%s in %qd transfer%s", 1850 (qdfmt_t)otbi, PLURAL(otbi), 1851 (qdfmt_t)total_xfers_in, PLURAL(total_xfers_in)); 1852 reply(0, "Total traffic: %qd byte%s in %qd transfer%s", 1853 (qdfmt_t)otb, PLURAL(otb), 1854 (qdfmt_t)total_xfers, PLURAL(total_xfers)); 1855 1856 if (logged_in) { 1857 struct ftpconv *cp; 1858 1859 reply(0, "%s", ""); 1860 reply(0, "Class: %s, type: %s", 1861 curclass.classname, CURCLASSTYPE); 1862 reply(0, "Check PORT/LPRT commands: %sabled", 1863 curclass.checkportcmd ? "en" : "dis"); 1864 if (! EMPTYSTR(curclass.display)) 1865 reply(0, "Display file: %s", curclass.display); 1866 if (! EMPTYSTR(curclass.notify)) 1867 reply(0, "Notify fileglob: %s", curclass.notify); 1868 reply(0, "Idle timeout: %d, maximum timeout: %d", 1869 curclass.timeout, curclass.maxtimeout); 1870 reply(0, "Current connections: %d", connections); 1871 if (curclass.limit == -1) 1872 reply(0, "Maximum connections: unlimited"); 1873 else 1874 reply(0, "Maximum connections: %d", curclass.limit); 1875 if (curclass.limitfile) 1876 reply(0, "Connection limit exceeded file: %s", 1877 curclass.limitfile); 1878 if (! EMPTYSTR(curclass.chroot)) 1879 reply(0, "Chroot format: %s", curclass.chroot); 1880 if (! EMPTYSTR(curclass.homedir)) 1881 reply(0, "Homedir format: %s", curclass.homedir); 1882 if (! EMPTYSTR(curclass.motd)) 1883 reply(0, "MotD file: %s", curclass.motd); 1884 reply(0, 1885 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 1886 curclass.modify ? "en" : "dis"); 1887 reply(0, "Upload commands (APPE, STOR, STOU): %sabled", 1888 curclass.upload ? "en" : "dis"); 1889 if (curclass.portmin && curclass.portmax) 1890 reply(0, "PASV port range: %d - %d", 1891 curclass.portmin, curclass.portmax); 1892 if (curclass.rateget) 1893 reply(0, "Rate get limit: %d bytes/sec", 1894 curclass.rateget); 1895 else 1896 reply(0, "Rate get limit: disabled"); 1897 if (curclass.rateput) 1898 reply(0, "Rate put limit: %d bytes/sec", 1899 curclass.rateput); 1900 else 1901 reply(0, "Rate put limit: disabled"); 1902 reply(0, "Umask: %.04o", curclass.umask); 1903 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1904 if (cp->suffix == NULL || cp->types == NULL || 1905 cp->command == NULL) 1906 continue; 1907 reply(0, "Conversion: %s [%s] disable: %s, command: %s", 1908 cp->suffix, cp->types, cp->disable, cp->command); 1909 } 1910 } 1911 1912 reply(211, "End of status"); 1913 } 1914 1915 void 1916 fatal(const char *s) 1917 { 1918 1919 reply(451, "Error in server: %s\n", s); 1920 reply(221, "Closing connection due to server error."); 1921 dologout(0); 1922 /* NOTREACHED */ 1923 } 1924 1925 /* 1926 * reply() -- 1927 * depending on the value of n, display fmt with a trailing CRLF and 1928 * prefix of: 1929 * n < -1 prefix the message with abs(n) + "-" (initial line) 1930 * n == 0 prefix the message with 4 spaces (middle lines) 1931 * n > 0 prefix the message with n + " " (final line) 1932 */ 1933 void 1934 reply(int n, const char *fmt, ...) 1935 { 1936 off_t b; 1937 va_list ap; 1938 1939 va_start(ap, fmt); 1940 b = 0; 1941 if (n == 0) 1942 cprintf(stdout, " "); 1943 else if (n < 0) 1944 cprintf(stdout, "%d-", -n); 1945 else 1946 cprintf(stdout, "%d ", n); 1947 b = vprintf(fmt, ap); 1948 total_bytes += b; 1949 total_bytes_out += b; 1950 cprintf(stdout, "\r\n"); 1951 (void)fflush(stdout); 1952 if (debug) { 1953 syslog(LOG_DEBUG, "<--- %d%c", abs(n), (n < 0) ? '-' : ' '); 1954 vsyslog(LOG_DEBUG, fmt, ap); 1955 } 1956 } 1957 1958 static void 1959 dolog(struct sockaddr *who) 1960 { 1961 getnameinfo(who, who->sa_len, remotehost, sizeof(remotehost), NULL,0,0); 1962 #ifdef HASSETPROCTITLE 1963 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1964 setproctitle("%s", proctitle); 1965 #endif /* HASSETPROCTITLE */ 1966 if (logging) 1967 syslog(LOG_INFO, "connection from %s to %s", 1968 remotehost, hostname); 1969 } 1970 1971 /* 1972 * Record logout in wtmp file 1973 * and exit with supplied status. 1974 */ 1975 void 1976 dologout(int status) 1977 { 1978 /* 1979 * Prevent reception of SIGURG from resulting in a resumption 1980 * back to the main program loop. 1981 */ 1982 transflag = 0; 1983 1984 if (logged_in) { 1985 (void) seteuid((uid_t)0); 1986 logwtmp(ttyline, "", ""); 1987 if (doutmp) 1988 logout(utmp.ut_line); 1989 #ifdef KERBEROS 1990 if (!notickets && krbtkfile_env) 1991 unlink(krbtkfile_env); 1992 #endif 1993 } 1994 /* beware of flushing buffers after a SIGPIPE */ 1995 _exit(status); 1996 } 1997 1998 static void 1999 myoob(int signo) 2000 { 2001 char *cp; 2002 2003 /* only process if transfer occurring */ 2004 if (!transflag) 2005 return; 2006 cp = tmpline; 2007 if (getline(cp, 7, stdin) == NULL) { 2008 reply(221, "You could at least say goodbye."); 2009 dologout(0); 2010 } 2011 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2012 tmpline[0] = '\0'; 2013 reply(426, "Transfer aborted. Data connection closed."); 2014 reply(226, "Abort successful"); 2015 longjmp(urgcatch, 1); 2016 } 2017 if (strcasecmp(cp, "STAT\r\n") == 0) { 2018 tmpline[0] = '\0'; 2019 if (file_size != (off_t) -1) 2020 reply(213, "Status: %qd of %qd byte%s transferred", 2021 (qdfmt_t)byte_count, (qdfmt_t)file_size, 2022 PLURAL(byte_count)); 2023 else 2024 reply(213, "Status: %qd byte%s transferred", 2025 (qdfmt_t)byte_count, PLURAL(byte_count)); 2026 } 2027 } 2028 2029 static int 2030 bind_pasv_addr(void) 2031 { 2032 static int passiveport; 2033 int port, len; 2034 2035 len = pasv_addr.su_len; 2036 if (curclass.portmin == 0 && curclass.portmax == 0) { 2037 pasv_addr.su_port = 0; 2038 return (bind(pdata, (struct sockaddr *)&pasv_addr, len)); 2039 } 2040 2041 if (passiveport == 0) { 2042 srand(getpid()); 2043 passiveport = rand() % (curclass.portmax - curclass.portmin) 2044 + curclass.portmin; 2045 } 2046 2047 port = passiveport; 2048 while (1) { 2049 port++; 2050 if (port > curclass.portmax) 2051 port = curclass.portmin; 2052 else if (port == passiveport) { 2053 errno = EAGAIN; 2054 return (-1); 2055 } 2056 pasv_addr.su_port = htons(port); 2057 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) == 0) 2058 break; 2059 if (errno != EADDRINUSE) 2060 return (-1); 2061 } 2062 passiveport = port; 2063 return (0); 2064 } 2065 2066 /* 2067 * Note: a response of 425 is not mentioned as a possible response to 2068 * the PASV command in RFC959. However, it has been blessed as 2069 * a legitimate response by Jon Postel in a telephone conversation 2070 * with Rick Adams on 25 Jan 89. 2071 */ 2072 void 2073 passive(void) 2074 { 2075 int len; 2076 char *p, *a; 2077 2078 if (pdata >= 0) 2079 close(pdata); 2080 pdata = socket(AF_INET, SOCK_STREAM, 0); 2081 if (pdata < 0 || !logged_in) { 2082 perror_reply(425, "Can't open passive connection"); 2083 return; 2084 } 2085 pasv_addr = ctrl_addr; 2086 2087 if (bind_pasv_addr() < 0) 2088 goto pasv_error; 2089 len = pasv_addr.su_len; 2090 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2091 goto pasv_error; 2092 if (listen(pdata, 1) < 0) 2093 goto pasv_error; 2094 a = (char *) &pasv_addr.su_sin.sin_addr; 2095 p = (char *) &pasv_addr.su_port; 2096 2097 #define UC(b) (((int) b) & 0xff) 2098 2099 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2100 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2101 return; 2102 2103 pasv_error: 2104 (void) close(pdata); 2105 pdata = -1; 2106 perror_reply(425, "Can't open passive connection"); 2107 return; 2108 } 2109 2110 /* 2111 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2112 * 229 Entering Extended Passive Mode (|||port|) 2113 */ 2114 void 2115 long_passive(char *cmd, int pf) 2116 { 2117 int len; 2118 char *p, *a; 2119 2120 if (!logged_in) { 2121 syslog(LOG_NOTICE, "long passive but not logged in"); 2122 reply(503, "Login with USER first."); 2123 return; 2124 } 2125 2126 if (pf != PF_UNSPEC) { 2127 if (ctrl_addr.su_family != pf) { 2128 switch (ctrl_addr.su_family) { 2129 case AF_INET: 2130 pf = 1; 2131 break; 2132 case AF_INET6: 2133 pf = 2; 2134 break; 2135 default: 2136 pf = 0; 2137 break; 2138 } 2139 /* 2140 * XXX 2141 * only EPRT/EPSV ready clients will understand this 2142 */ 2143 if (strcmp(cmd, "EPSV") == 0 && pf) { 2144 reply(522, "Network protocol mismatch, " 2145 "use (%d)", pf); 2146 } else 2147 reply(501, "Network protocol mismatch"); /*XXX*/ 2148 2149 return; 2150 } 2151 } 2152 2153 if (pdata >= 0) 2154 close(pdata); 2155 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2156 if (pdata < 0) { 2157 perror_reply(425, "Can't open passive connection"); 2158 return; 2159 } 2160 pasv_addr = ctrl_addr; 2161 if (bind_pasv_addr() < 0) 2162 goto pasv_error; 2163 len = pasv_addr.su_len; 2164 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2165 goto pasv_error; 2166 if (listen(pdata, 1) < 0) 2167 goto pasv_error; 2168 p = (char *) &pasv_addr.su_port; 2169 2170 #define UC(b) (((int) b) & 0xff) 2171 2172 if (strcmp(cmd, "LPSV") == 0) { 2173 switch (pasv_addr.su_family) { 2174 case AF_INET: 2175 a = (char *) &pasv_addr.su_sin.sin_addr; 2176 reply(228, "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2177 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2178 2, UC(p[0]), UC(p[1])); 2179 return; 2180 case AF_INET6: 2181 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2182 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)", 2183 6, 16, 2184 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2185 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2186 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2187 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2188 2, UC(p[0]), UC(p[1])); 2189 return; 2190 } 2191 #undef UC 2192 } else if (strcmp(cmd, "EPSV") == 0) { 2193 switch (pasv_addr.su_family) { 2194 case AF_INET: 2195 case AF_INET6: 2196 reply(229, "Entering Extended Passive Mode (|||%d|)", 2197 ntohs(pasv_addr.su_port)); 2198 return; 2199 } 2200 } else { 2201 /* more proper error code? */ 2202 } 2203 2204 pasv_error: 2205 (void) close(pdata); 2206 pdata = -1; 2207 perror_reply(425, "Can't open passive connection"); 2208 return; 2209 } 2210 2211 /* 2212 * Generate unique name for file with basename "local". 2213 * The file named "local" is already known to exist. 2214 * Generates failure reply on error. 2215 * 2216 * XXX this function should under go changes similar to 2217 * the mktemp(3)/mkstemp(3) changes. 2218 */ 2219 static char * 2220 gunique(const char *local) 2221 { 2222 static char new[MAXPATHLEN]; 2223 struct stat st; 2224 char *cp; 2225 int count; 2226 2227 cp = strrchr(local, '/'); 2228 if (cp) 2229 *cp = '\0'; 2230 if (stat(cp ? local : ".", &st) < 0) { 2231 perror_reply(553, cp ? local : "."); 2232 return (NULL); 2233 } 2234 if (cp) 2235 *cp = '/'; 2236 for (count = 1; count < 100; count++) { 2237 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2238 if (stat(new, &st) < 0) 2239 return (new); 2240 } 2241 reply(452, "Unique file name cannot be created."); 2242 return (NULL); 2243 } 2244 2245 /* 2246 * Format and send reply containing system error number. 2247 */ 2248 void 2249 perror_reply(int code, const char *string) 2250 { 2251 int save_errno; 2252 2253 save_errno = errno; 2254 reply(code, "%s: %s.", string, strerror(errno)); 2255 errno = save_errno; 2256 } 2257 2258 static char *onefile[] = { 2259 "", 2260 0 2261 }; 2262 2263 void 2264 send_file_list(const char *whichf) 2265 { 2266 struct stat st; 2267 DIR *dirp = NULL; 2268 struct dirent *dir; 2269 FILE *dout = NULL; 2270 char **dirlist, *dirname, *p; 2271 int simple = 0; 2272 int freeglob = 0; 2273 glob_t gl; 2274 off_t b; 2275 2276 #ifdef __GNUC__ 2277 (void) &dout; 2278 (void) &dirlist; 2279 (void) &simple; 2280 (void) &freeglob; 2281 #endif 2282 2283 p = NULL; 2284 if (strpbrk(whichf, "~{[*?") != NULL) { 2285 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2286 2287 memset(&gl, 0, sizeof(gl)); 2288 freeglob = 1; 2289 if (glob(whichf, flags, 0, &gl)) { 2290 reply(550, "not found"); 2291 goto out; 2292 } else if (gl.gl_pathc == 0) { 2293 errno = ENOENT; 2294 perror_reply(550, whichf); 2295 goto out; 2296 } 2297 dirlist = gl.gl_pathv; 2298 } else { 2299 p = xstrdup(whichf); 2300 onefile[0] = p; 2301 dirlist = onefile; 2302 simple = 1; 2303 } 2304 /* XXX: } for vi sm */ 2305 2306 if (setjmp(urgcatch)) { 2307 transflag = 0; 2308 goto out; 2309 } 2310 while ((dirname = *dirlist++) != NULL) { 2311 int trailingslash = 0; 2312 2313 if (stat(dirname, &st) < 0) { 2314 /* 2315 * If user typed "ls -l", etc, and the client 2316 * used NLST, do what the user meant. 2317 */ 2318 /* XXX: nuke this support? */ 2319 if (dirname[0] == '-' && *dirlist == NULL && 2320 transflag == 0) { 2321 char *argv[] = { INTERNAL_LS, "", NULL }; 2322 2323 argv[1] = dirname; 2324 retrieve(argv, dirname); 2325 goto out; 2326 } 2327 perror_reply(550, whichf); 2328 goto cleanup_send_file_list; 2329 } 2330 2331 if (S_ISREG(st.st_mode)) { 2332 if (dout == NULL) { 2333 dout = dataconn("file list", (off_t)-1, "w"); 2334 if (dout == NULL) 2335 goto out; 2336 transflag++; 2337 } 2338 b = fprintf(dout, "%s%s\n", dirname, 2339 type == TYPE_A ? "\r" : ""); 2340 total_bytes += b; 2341 total_bytes_out += b; 2342 byte_count += strlen(dirname) + 1; 2343 continue; 2344 } else if (!S_ISDIR(st.st_mode)) 2345 continue; 2346 2347 if (dirname[strlen(dirname) - 1] == '/') 2348 trailingslash++; 2349 2350 if ((dirp = opendir(dirname)) == NULL) 2351 continue; 2352 2353 while ((dir = readdir(dirp)) != NULL) { 2354 char nbuf[MAXPATHLEN]; 2355 2356 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 2357 continue; 2358 2359 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2360 trailingslash ? "" : "/", dir->d_name); 2361 2362 /* 2363 * We have to do a stat to ensure it's 2364 * not a directory or special file. 2365 */ 2366 /* XXX: follow RFC959 and filter out non files ? */ 2367 if (simple || (stat(nbuf, &st) == 0 && 2368 S_ISREG(st.st_mode))) { 2369 char *p; 2370 2371 if (dout == NULL) { 2372 dout = dataconn("file list", (off_t)-1, 2373 "w"); 2374 if (dout == NULL) 2375 goto out; 2376 transflag++; 2377 } 2378 p = nbuf; 2379 if (nbuf[0] == '.' && nbuf[1] == '/') 2380 p = &nbuf[2]; 2381 b = fprintf(dout, "%s%s\n", p, 2382 type == TYPE_A ? "\r" : ""); 2383 total_bytes += b; 2384 total_bytes_out += b; 2385 byte_count += strlen(nbuf) + 1; 2386 } 2387 } 2388 (void) closedir(dirp); 2389 } 2390 2391 if (dout == NULL) 2392 reply(550, "No files found."); 2393 else if (ferror(dout) != 0) 2394 perror_reply(550, "Data connection"); 2395 else 2396 reply(226, "Transfer complete."); 2397 2398 cleanup_send_file_list: 2399 transflag = 0; 2400 closedataconn(dout); 2401 out: 2402 total_xfers++; 2403 total_xfers_out++; 2404 if (p) 2405 free(p); 2406 if (freeglob) 2407 globfree(&gl); 2408 } 2409 2410 char * 2411 conffilename(const char *s) 2412 { 2413 static char filename[MAXPATHLEN]; 2414 2415 if (*s == '/') 2416 strlcpy(filename, s, sizeof(filename)); 2417 else 2418 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2419 return (filename); 2420 } 2421 2422 /* 2423 * logcmd -- 2424 * based on the arguments, syslog a message: 2425 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2426 * else if file2 != NULL "<command> <file1> <file2>" 2427 * else "<command> <file1>" 2428 * if elapsed != NULL, append "in xxx.yyy seconds" 2429 * if error != NULL, append ": " + error 2430 */ 2431 void 2432 logcmd(const char *command, off_t bytes, const char *file1, const char *file2, 2433 const struct timeval *elapsed, const char *error) 2434 { 2435 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN]; 2436 const char *p; 2437 size_t len; 2438 2439 if (logging <=1) 2440 return; 2441 2442 if ((p = realpath(file1, realfile)) == NULL) { 2443 #if 0 /* XXX: too noisy */ 2444 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2445 realfile, strerror(errno)); 2446 #endif 2447 p = file1; 2448 } 2449 len = snprintf(buf, sizeof(buf), "%s %s", command, p); 2450 2451 if (bytes != (off_t)-1) { 2452 len += snprintf(buf + len, sizeof(buf) - len, 2453 " = %qd byte%s", (qdfmt_t) bytes, PLURAL(bytes)); 2454 } else if (file2 != NULL) { 2455 if ((p = realpath(file2, realfile)) == NULL) { 2456 #if 0 /* XXX: too noisy */ 2457 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2458 realfile, strerror(errno)); 2459 #endif 2460 p = file2; 2461 } 2462 len += snprintf(buf + len, sizeof(buf) - len, " %s", p); 2463 } 2464 2465 if (elapsed != NULL) { 2466 len += snprintf(buf + len, sizeof(buf) - len, 2467 " in %ld.%.03d seconds", elapsed->tv_sec, 2468 (int)(elapsed->tv_usec / 1000)); 2469 } 2470 2471 if (error != NULL) 2472 len += snprintf(buf + len, sizeof(buf) - len, ": %s", error); 2473 2474 syslog(LOG_INFO, "%s", buf); 2475 } 2476 2477 char * 2478 xstrdup(const char *s) 2479 { 2480 char *new = strdup(s); 2481 2482 if (new == NULL) 2483 fatal("Local resource failure: malloc"); 2484 /* NOTREACHED */ 2485 return (new); 2486 } 2487 2488 /* 2489 * As per fprintf(), but increment total_bytes and total_bytes_out, 2490 * by the appropriate amount. 2491 */ 2492 void 2493 cprintf(FILE *fd, const char *fmt, ...) 2494 { 2495 off_t b; 2496 va_list ap; 2497 2498 va_start(ap, fmt); 2499 b = vfprintf(fd, fmt, ap); 2500 total_bytes += b; 2501 total_bytes_out += b; 2502 } 2503
Indexes created Mon Sep 22 13:09:51 GMT 2025