ftpd.c revision 1.93
1 /* $NetBSD: ftpd.c,v 1.93 2000/06/14 13:44:24 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 1.93 2000/06/14 13:44:24 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'; 246 247 while ((ch = getopt(argc, argv, "a:c:C:dh:lst:T:u:Uv")) != -1) { 248 switch (ch) { 249 case 'a': 250 anondir = optarg; 251 break; 252 253 case 'c': 254 (void)strlcpy(confdir, optarg, sizeof(confdir)); 255 break; 256 257 case 'C': 258 pw = sgetpwnam(optarg); 259 exit(checkaccess(optarg) ? 0 : 1); 260 /* NOTREACHED */ 261 262 case 'd': 263 case 'v': /* deprecated */ 264 debug = 1; 265 break; 266 267 case 'h': 268 strlcpy(hostname, optarg, sizeof(hostname)); 269 break; 270 271 case 'l': 272 logging++; /* > 1 == extra logging */ 273 break; 274 275 case 's': 276 sflag = 1; 277 break; 278 279 case 't': 280 case 'T': 281 case 'u': 282 warnx("-%c has been deprecated in favour of ftpd.conf", 283 ch); 284 break; 285 286 case 'U': 287 doutmp = 1; 288 break; 289 290 default: 291 if (optopt == 'a' || optopt == 'C') 292 exit(1); 293 warnx("unknown flag -%c ignored", optopt); 294 break; 295 } 296 } 297 298 /* 299 * LOG_NDELAY sets up the logging connection immediately, 300 * necessary for anonymous ftp's that chroot and can't do it later. 301 */ 302 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 303 addrlen = sizeof(his_addr); /* xxx */ 304 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 305 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 306 exit(1); 307 } 308 addrlen = sizeof(ctrl_addr); 309 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 310 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 311 exit(1); 312 } 313 if (his_addr.su_family == AF_INET6 314 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 315 #if 1 316 /* 317 * IPv4 control connection arrived to AF_INET6 socket. 318 * I hate to do this, but this is the easiest solution. 319 * 320 * The assumption is untrue on SIIT environment. 321 */ 322 union sockunion tmp_addr; 323 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 324 325 tmp_addr = his_addr; 326 memset(&his_addr, 0, sizeof(his_addr)); 327 his_addr.su_sin.sin_family = AF_INET; 328 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 329 memcpy(&his_addr.su_sin.sin_addr, 330 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 331 sizeof(his_addr.su_sin.sin_addr)); 332 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 333 334 tmp_addr = ctrl_addr; 335 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 336 ctrl_addr.su_sin.sin_family = AF_INET; 337 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 338 memcpy(&ctrl_addr.su_sin.sin_addr, 339 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 340 sizeof(ctrl_addr.su_sin.sin_addr)); 341 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 342 #else 343 while (fgets(line, sizeof(line), fd) != NULL) { 344 if ((cp = strchr(line, '\n')) != NULL) 345 *cp = '\0'; 346 lreply(530, "%s", line); 347 } 348 (void) fflush(stdout); 349 (void) fclose(fd); 350 reply(530, 351 "Connection from IPv4 mapped address is not supported."); 352 exit(0); 353 #endif 354 355 mapped = 1; 356 } else 357 mapped = 0; 358 #ifdef IP_TOS 359 if (!mapped && his_addr.su_family == AF_INET) { 360 tos = IPTOS_LOWDELAY; 361 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 362 sizeof(int)) < 0) 363 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 364 } 365 #endif 366 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 367 368 /* if the hostname hasn't been given, attempt to determine it */ 369 if (hostname[0] == '\0') { 370 if (getnameinfo((struct sockaddr *)&ctrl_addr, ctrl_addr.su_len, 371 hostname, sizeof(hostname), NULL, 0, 0) != 0) 372 (void)gethostname(hostname, sizeof(hostname)); 373 hostname[sizeof(hostname) - 1] = '\0'; 374 } 375 376 /* set this here so klogin can use it... */ 377 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 378 379 (void) freopen(_PATH_DEVNULL, "w", stderr); 380 (void) signal(SIGPIPE, lostconn); 381 (void) signal(SIGCHLD, SIG_IGN); 382 if (signal(SIGURG, myoob) == SIG_ERR) 383 syslog(LOG_ERR, "signal: %m"); 384 385 /* Try to handle urgent data inline */ 386 #ifdef SO_OOBINLINE 387 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 388 syslog(LOG_ERR, "setsockopt: %m"); 389 #endif 390 /* Set keepalives on the socket to detect dropped connections. */ 391 #ifdef SO_KEEPALIVE 392 keepalive = 1; 393 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 394 sizeof(int)) < 0) 395 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 396 #endif 397 398 #ifdef F_SETOWN 399 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 400 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 401 #endif 402 dolog((struct sockaddr *)&his_addr); 403 /* 404 * Set up default state 405 */ 406 data = -1; 407 type = TYPE_A; 408 form = FORM_N; 409 stru = STRU_F; 410 mode = MODE_S; 411 tmpline[0] = '\0'; 412 hasyyerrored = 0; 413 414 #ifdef KERBEROS5 415 kerror = krb5_init_context(&kcontext); 416 if (kerror) { 417 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 418 error_message(kerror)); 419 exit(0); 420 } 421 #endif /* KERBEROS5 */ 422 423 init_curclass(); 424 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 425 curclass.type = CLASS_REAL; 426 427 /* If logins are disabled, print out the message. */ 428 if (format_file(_PATH_NOLOGIN, 530)) { 429 reply(530, "System not available."); 430 exit(0); 431 } 432 (void)format_file(conffilename(_PATH_FTPWELCOME), 220); 433 /* reply(220,) must follow */ 434 reply(220, "%s FTP server (%s) ready.", hostname, FTPD_VERSION); 435 436 (void) setjmp(errcatch); 437 for (;;) 438 (void) yyparse(); 439 /* NOTREACHED */ 440 } 441 442 static void 443 lostconn(int signo) 444 { 445 446 if (debug) 447 syslog(LOG_DEBUG, "lost connection"); 448 dologout(1); 449 } 450 451 /* 452 * Save the result of a getpwnam. Used for USER command, since 453 * the data returned must not be clobbered by any other command 454 * (e.g., globbing). 455 */ 456 static struct passwd * 457 sgetpwnam(const char *name) 458 { 459 static struct passwd save; 460 struct passwd *p; 461 462 if ((p = getpwnam(name)) == NULL) 463 return (p); 464 if (save.pw_name) { 465 free((char *)save.pw_name); 466 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 467 free((char *)save.pw_passwd); 468 free((char *)save.pw_gecos); 469 free((char *)save.pw_dir); 470 free((char *)save.pw_shell); 471 } 472 save = *p; 473 save.pw_name = xstrdup(p->pw_name); 474 save.pw_passwd = xstrdup(p->pw_passwd); 475 save.pw_gecos = xstrdup(p->pw_gecos); 476 save.pw_dir = xstrdup(p->pw_dir); 477 save.pw_shell = xstrdup(p->pw_shell); 478 return (&save); 479 } 480 481 static int login_attempts; /* number of failed login attempts */ 482 static int askpasswd; /* had user command, ask for passwd */ 483 static char curname[10]; /* current USER name */ 484 485 /* 486 * USER command. 487 * Sets global passwd pointer pw if named account exists and is acceptable; 488 * sets askpasswd if a PASS command is expected. If logged in previously, 489 * need to reset state. If name is "ftp" or "anonymous", the name is not in 490 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 491 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 492 * requesting login privileges. Disallow anyone who does not have a standard 493 * shell as returned by getusershell(). Disallow anyone mentioned in the file 494 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 495 */ 496 void 497 user(const char *name) 498 { 499 if (logged_in) { 500 switch (curclass.type) { 501 case CLASS_GUEST: 502 reply(530, "Can't change user from guest login."); 503 return; 504 case CLASS_CHROOT: 505 reply(530, "Can't change user from chroot user."); 506 return; 507 case CLASS_REAL: 508 end_login(); 509 break; 510 default: 511 abort(); 512 } 513 } 514 515 #if defined(KERBEROS) 516 kdestroy(); 517 #endif 518 #if defined(KERBEROS5) 519 k5destroy(); 520 #endif 521 522 curclass.type = CLASS_REAL; 523 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 524 /* need `pw' setup for checkaccess() and checkuser () */ 525 if ((pw = sgetpwnam("ftp")) == NULL) 526 reply(530, "User %s unknown.", name); 527 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 528 reply(530, "User %s access denied.", name); 529 else { 530 curclass.type = CLASS_GUEST; 531 askpasswd = 1; 532 reply(331, 533 "Guest login ok, type your name as password."); 534 } 535 if (!askpasswd && logging) 536 syslog(LOG_NOTICE, 537 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 538 return; 539 } 540 541 pw = sgetpwnam(name); 542 if (logging) 543 strlcpy(curname, name, sizeof(curname)); 544 545 #ifdef SKEY 546 if (skey_haskey(name) == 0) { 547 char *myskey; 548 549 myskey = skey_keyinfo(name); 550 reply(331, "Password [%s] required for %s.", 551 myskey ? myskey : "error getting challenge", name); 552 } else 553 #endif 554 reply(331, "Password required for %s.", name); 555 556 askpasswd = 1; 557 /* 558 * Delay before reading passwd after first failed 559 * attempt to slow down passwd-guessing programs. 560 */ 561 if (login_attempts) 562 sleep((unsigned) login_attempts); 563 } 564 565 /* 566 * Determine whether something is to happen (allow access, chroot) 567 * for a user. Each line is a shell-style glob followed by 568 * `yes' or `no'. 569 * 570 * For backward compatability, `allow' and `deny' are synonymns 571 * for `yes' and `no', respectively. 572 * 573 * Each glob is matched against the username in turn, and the first 574 * match found is used. If no match is found, the result is the 575 * argument `def'. If a match is found but without and explicit 576 * `yes'/`no', the result is the opposite of def. 577 * 578 * If the file doesn't exist at all, the result is the argument 579 * `nofile' 580 * 581 * Any line starting with `#' is considered a comment and ignored. 582 * 583 * Returns 0 if the user is denied, or 1 if they are allowed. 584 * 585 * NOTE: needs struct passwd *pw setup before use. 586 */ 587 int 588 checkuser(const char *fname, const char *name, int def, int nofile, 589 char **retclass) 590 { 591 FILE *fd; 592 int retval; 593 char *glob, *perm, *class, *buf, *p; 594 size_t len, line; 595 596 retval = def; 597 if (retclass != NULL) 598 *retclass = NULL; 599 if ((fd = fopen(conffilename(fname), "r")) == NULL) 600 return nofile; 601 602 line = 0; 603 for (; 604 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 605 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 606 free(buf), buf = NULL) { 607 glob = perm = class = NULL; 608 p = buf; 609 if (len < 1) 610 continue; 611 if (p[len - 1] == '\n') 612 p[--len] = '\0'; 613 if (EMPTYSTR(p)) 614 continue; 615 616 NEXTWORD(p, glob); 617 NEXTWORD(p, perm); 618 NEXTWORD(p, class); 619 if (EMPTYSTR(glob)) 620 continue; 621 if (!EMPTYSTR(class)) { 622 if (strcasecmp(class, "all") == 0 || 623 strcasecmp(class, "none") == 0) { 624 syslog(LOG_WARNING, 625 "%s line %d: illegal user-defined class `%s' - skipping entry", 626 fname, (int)line, class); 627 continue; 628 } 629 } 630 631 /* have a host specifier */ 632 if ((p = strchr(glob, '@')) != NULL) { 633 u_int32_t net, mask, addr; 634 int bits; 635 636 *p++ = '\0'; 637 /* check against network or CIDR */ 638 if (isdigit(*p) && 639 (bits = inet_net_pton(AF_INET, p, 640 &net, sizeof(net))) != -1) { 641 net = ntohl(net); 642 mask = 0xffffffffU << (32 - bits); 643 addr = ntohl(his_addr.su_sin.sin_addr.s_addr); 644 if ((addr & mask) != net) 645 continue; 646 647 /* check against hostname glob */ 648 } else if (fnmatch(p, remotehost, 0) != 0) 649 continue; 650 } 651 652 /* have a group specifier */ 653 if ((p = strchr(glob, ':')) != NULL) { 654 gid_t *groups, *ng; 655 int gsize, i, found; 656 657 *p++ = '\0'; 658 groups = NULL; 659 gsize = 16; 660 do { 661 ng = realloc(groups, gsize * sizeof(gid_t)); 662 if (ng == NULL) 663 fatal( 664 "Local resource failure: realloc"); 665 groups = ng; 666 } while (getgrouplist(pw->pw_name, pw->pw_gid, 667 groups, &gsize) == -1); 668 found = 0; 669 for (i = 0; i < gsize; i++) { 670 struct group *g; 671 672 if ((g = getgrgid(groups[i])) == NULL) 673 continue; 674 if (fnmatch(p, g->gr_name, 0) == 0) { 675 found = 1; 676 break; 677 } 678 } 679 free(groups); 680 if (!found) 681 continue; 682 } 683 684 /* check against username glob */ 685 if (fnmatch(glob, name, 0) != 0) 686 continue; 687 688 if (perm != NULL && 689 ((strcasecmp(perm, "allow") == 0) || 690 (strcasecmp(perm, "yes") == 0))) 691 retval = 1; 692 else if (perm != NULL && 693 ((strcasecmp(perm, "deny") == 0) || 694 (strcasecmp(perm, "no") == 0))) 695 retval = 0; 696 else 697 retval = !def; 698 if (!EMPTYSTR(class) && retclass != NULL) 699 *retclass = xstrdup(class); 700 free(buf); 701 break; 702 } 703 (void) fclose(fd); 704 return (retval); 705 } 706 707 /* 708 * Check if user is allowed by /etc/ftpusers 709 * returns 1 for yes, 0 for no 710 * 711 * NOTE: needs struct passwd *pw setup (for checkuser()) 712 */ 713 int 714 checkaccess(const char *name) 715 { 716 717 return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL)); 718 } 719 720 /* 721 * Terminate login as previous user, if any, resetting state; 722 * used when USER command is given or login fails. 723 */ 724 static void 725 end_login(void) 726 { 727 728 (void) seteuid((uid_t)0); 729 if (logged_in) { 730 logwtmp(ttyline, "", ""); 731 if (doutmp) 732 logout(utmp.ut_line); 733 } 734 pw = NULL; 735 logged_in = 0; 736 quietmessages = 0; 737 curclass.type = CLASS_REAL; 738 } 739 740 void 741 pass(const char *passwd) 742 { 743 int rval; 744 const char *cp, *shell, *home; 745 char *class; 746 747 class = NULL; 748 if (logged_in || askpasswd == 0) { 749 reply(503, "Login with USER first."); 750 return; 751 } 752 askpasswd = 0; 753 if (curclass.type != CLASS_GUEST) { 754 /* "ftp" is only account allowed no password */ 755 if (pw == NULL) { 756 rval = 1; /* failure below */ 757 goto skip; 758 } 759 #if defined(KERBEROS) 760 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 761 rval = 0; 762 goto skip; 763 } 764 #endif 765 #if defined(KERBEROS5) 766 if (k5login(pw, "", hostname, (char *)passwd) == 0) { 767 rval = 0; 768 goto skip; 769 } 770 #endif 771 #ifdef SKEY 772 if (skey_haskey(pw->pw_name) == 0) { 773 char *p; 774 int r; 775 776 p = xstrdup(passwd); 777 r = skey_passcheck(pw->pw_name, p); 778 free(p); 779 if (r != -1) { 780 rval = 0; 781 goto skip; 782 } 783 } 784 #endif 785 if (!sflag && *pw->pw_passwd != '\0' && 786 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 787 rval = 0; 788 goto skip; 789 } 790 rval = 1; 791 792 skip: 793 if (pw != NULL && pw->pw_expire && time(NULL) >= pw->pw_expire) 794 rval = 2; 795 /* 796 * If rval > 0, the user failed the authentication check 797 * above. If rval == 0, either Kerberos or local authentication 798 * succeeded. 799 */ 800 if (rval) { 801 reply(530, rval == 2 ? "Password expired." : 802 "Login incorrect."); 803 if (logging) { 804 syslog(LOG_NOTICE, 805 "FTP LOGIN FAILED FROM %s", remotehost); 806 syslog(LOG_AUTHPRIV | LOG_NOTICE, 807 "FTP LOGIN FAILED FROM %s, %s", 808 remotehost, curname); 809 } 810 pw = NULL; 811 if (login_attempts++ >= 5) { 812 syslog(LOG_NOTICE, 813 "repeated login failures from %s", 814 remotehost); 815 exit(0); 816 } 817 return; 818 } 819 } 820 821 /* password was ok; see if anything else prevents login */ 822 if (! checkuser(_PATH_FTPUSERS, pw->pw_name, 1, 0, &class)) { 823 reply(530, "User %s may not use FTP.", pw->pw_name); 824 if (logging) 825 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 826 remotehost, pw->pw_name); 827 goto bad; 828 } 829 /* check for valid shell, if not guest user */ 830 if ((shell = pw->pw_shell) == NULL || *shell == 0) 831 shell = _PATH_BSHELL; 832 while ((cp = getusershell()) != NULL) 833 if (strcmp(cp, shell) == 0) 834 break; 835 endusershell(); 836 if (cp == NULL && curclass.type != CLASS_GUEST) { 837 reply(530, "User %s may not use FTP.", pw->pw_name); 838 if (logging) 839 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 840 remotehost, pw->pw_name); 841 goto bad; 842 } 843 844 login_attempts = 0; /* this time successful */ 845 if (setegid((gid_t)pw->pw_gid) < 0) { 846 reply(550, "Can't set gid."); 847 goto bad; 848 } 849 (void) initgroups(pw->pw_name, pw->pw_gid); 850 851 /* open wtmp before chroot */ 852 logwtmp(ttyline, pw->pw_name, remotehost); 853 854 /* open utmp before chroot */ 855 if (doutmp) { 856 memset((void *)&utmp, 0, sizeof(utmp)); 857 (void)time(&utmp.ut_time); 858 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 859 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 860 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 861 login(&utmp); 862 } 863 864 logged_in = 1; 865 866 /* check user in /etc/ftpchroot */ 867 if (checkuser(_PATH_FTPCHROOT, pw->pw_name, 0, 0, NULL)) { 868 if (curclass.type == CLASS_GUEST) { 869 syslog(LOG_NOTICE, 870 "Can't change guest user to chroot class; remove entry in %s", 871 _PATH_FTPCHROOT); 872 exit(1); 873 } 874 curclass.type = CLASS_CHROOT; 875 } 876 if (class == NULL) { 877 switch (curclass.type) { 878 case CLASS_GUEST: 879 class = xstrdup("guest"); 880 break; 881 case CLASS_CHROOT: 882 class = xstrdup("chroot"); 883 break; 884 case CLASS_REAL: 885 class = xstrdup("real"); 886 break; 887 default: 888 abort(); 889 } 890 } 891 892 /* parse ftpd.conf, setting up various parameters */ 893 parse_conf(class); 894 count_users(); 895 if (curclass.limit != -1 && connections > curclass.limit) { 896 if (! EMPTYSTR(curclass.limitfile)) 897 (void)format_file(conffilename(curclass.limitfile),530); 898 reply(530, 899 "User %s access denied, connection limit of %d reached.", 900 pw->pw_name, curclass.limit); 901 syslog(LOG_NOTICE, 902 "Maximum connection limit of %d for class %s reached, login refused", 903 curclass.limit, curclass.classname); 904 goto bad; 905 } 906 907 home = "/"; 908 switch (curclass.type) { 909 case CLASS_GUEST: 910 /* 911 * We MUST do a chdir() after the chroot. Otherwise 912 * the old current directory will be accessible as "." 913 * outside the new root! 914 */ 915 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 916 chdir("/") < 0) { 917 reply(550, "Can't set guest privileges."); 918 goto bad; 919 } 920 break; 921 case CLASS_CHROOT: 922 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 923 reply(550, "Can't change root."); 924 goto bad; 925 } 926 break; 927 case CLASS_REAL: 928 if (chdir(pw->pw_dir) < 0) { 929 if (chdir("/") < 0) { 930 reply(530, 931 "User %s: can't change directory to %s.", 932 pw->pw_name, pw->pw_dir); 933 goto bad; 934 } else 935 lreply(230, 936 "No directory! Logging in with home=/"); 937 } else 938 home = pw->pw_dir; 939 break; 940 } 941 if (seteuid((uid_t)pw->pw_uid) < 0) { 942 reply(550, "Can't set uid."); 943 goto bad; 944 } 945 setenv("HOME", home, 1); 946 947 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 948 quietmessages = 1; 949 950 /* 951 * Display a login message, if it exists. 952 * N.B. reply(230,) must follow the message. 953 */ 954 (void)format_file(conffilename(curclass.motd), 230); 955 show_chdir_messages(230); 956 if (curclass.type == CLASS_GUEST) { 957 reply(230, "Guest login ok, access restrictions apply."); 958 #ifdef HASSETPROCTITLE 959 snprintf(proctitle, sizeof(proctitle), 960 "%s: anonymous/%.*s", remotehost, 961 (int) (sizeof(proctitle) - sizeof(remotehost) - 962 sizeof(": anonymous/")), passwd); 963 setproctitle(proctitle); 964 #endif /* HASSETPROCTITLE */ 965 if (logging) 966 syslog(LOG_INFO, 967 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 968 remotehost, passwd, 969 curclass.classname, CURCLASSTYPE); 970 } else { 971 reply(230, "User %s logged in.", pw->pw_name); 972 #ifdef HASSETPROCTITLE 973 snprintf(proctitle, sizeof(proctitle), 974 "%s: %s", remotehost, pw->pw_name); 975 setproctitle(proctitle); 976 #endif /* HASSETPROCTITLE */ 977 if (logging) 978 syslog(LOG_INFO, 979 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 980 remotehost, pw->pw_name, 981 curclass.classname, CURCLASSTYPE); 982 } 983 (void) umask(curclass.umask); 984 goto cleanuppass; 985 bad: 986 /* Forget all about it... */ 987 end_login(); 988 cleanuppass: 989 if (class) 990 free(class); 991 } 992 993 void 994 retrieve(char *argv[], const char *name) 995 { 996 FILE *fin = NULL, *dout; 997 struct stat st; 998 int (*closefunc)(FILE *) = NULL; 999 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1000 struct timeval start, finish, td, *tdp; 1001 const char *dispname; 1002 1003 sendrv = closerv = stderrfd = -1; 1004 isconversion = isdata = isls = log = 0; 1005 tdp = NULL; 1006 dispname = name; 1007 if (argv == NULL) { 1008 log = 1; 1009 isdata = 1; 1010 fin = fopen(name, "r"); 1011 closefunc = fclose; 1012 if (fin == NULL) 1013 argv = do_conversion(name); 1014 if (argv != NULL) { 1015 isconversion++; 1016 syslog(LOG_INFO, "get command: '%s' on '%s'", 1017 argv[0], name); 1018 } 1019 } 1020 if (argv != NULL) { 1021 char temp[MAXPATHLEN]; 1022 1023 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1024 isls = 1; 1025 stderrfd = -1; 1026 } else { 1027 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1028 stderrfd = mkstemp(temp); 1029 if (stderrfd != -1) 1030 (void)unlink(temp); 1031 } 1032 dispname = argv[0]; 1033 fin = ftpd_popen(argv, "r", stderrfd); 1034 closefunc = ftpd_pclose; 1035 st.st_size = -1; 1036 st.st_blksize = BUFSIZ; 1037 } 1038 if (fin == NULL) { 1039 if (errno != 0) { 1040 perror_reply(550, dispname); 1041 if (log) 1042 logcmd("get", -1, name, NULL, NULL, 1043 strerror(errno)); 1044 } 1045 goto cleanupretrieve; 1046 } 1047 byte_count = -1; 1048 if (argv == NULL 1049 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1050 reply(550, "%s: not a plain file.", dispname); 1051 goto done; 1052 } 1053 if (restart_point) { 1054 if (type == TYPE_A) { 1055 off_t i; 1056 int c; 1057 1058 for (i = 0; i < restart_point; i++) { 1059 if ((c=getc(fin)) == EOF) { 1060 perror_reply(550, dispname); 1061 goto done; 1062 } 1063 if (c == '\n') 1064 i++; 1065 } 1066 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1067 perror_reply(550, dispname); 1068 goto done; 1069 } 1070 } 1071 dout = dataconn(dispname, st.st_size, "w"); 1072 if (dout == NULL) 1073 goto done; 1074 1075 (void)gettimeofday(&start, NULL); 1076 sendrv = send_data(fin, dout, st.st_blksize, isdata); 1077 (void)gettimeofday(&finish, NULL); 1078 (void) fclose(dout); 1079 timersub(&finish, &start, &td); 1080 tdp = &td; 1081 data = -1; 1082 done: 1083 if (log) 1084 logcmd("get", byte_count, name, NULL, tdp, NULL); 1085 closerv = (*closefunc)(fin); 1086 if (sendrv == 0) { 1087 FILE *err; 1088 struct stat sb; 1089 1090 if (!isls && argv != NULL && closerv != 0) { 1091 lreply(226, 1092 "Command returned an exit status of %d", 1093 closerv); 1094 if (isconversion) 1095 syslog(LOG_INFO, 1096 "retrieve command: '%s' returned %d", 1097 argv[0], closerv); 1098 } 1099 if (!isls && argv != NULL && stderrfd != -1 && 1100 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1101 ((err = fdopen(stderrfd, "r")) != NULL)) { 1102 char *cp, line[LINE_MAX]; 1103 1104 lreply(226, "Command error messages:"); 1105 rewind(err); 1106 while (fgets(line, sizeof(line), err) != NULL) { 1107 if ((cp = strchr(line, '\n')) != NULL) 1108 *cp = '\0'; 1109 lreply(0, " %s", line); 1110 } 1111 (void) fflush(stdout); 1112 (void) fclose(err); 1113 /* a reply(226,) must follow */ 1114 } 1115 reply(226, "Transfer complete."); 1116 } 1117 cleanupretrieve: 1118 if (pdata >= 0) 1119 (void)close(pdata); 1120 pdata = -1; 1121 if (stderrfd != -1) 1122 (void)close(stderrfd); 1123 if (isconversion) 1124 free(argv); 1125 } 1126 1127 void 1128 store(const char *name, const char *mode, int unique) 1129 { 1130 FILE *fout, *din; 1131 struct stat st; 1132 int (*closefunc)(FILE *); 1133 struct timeval start, finish, td, *tdp; 1134 char *desc; 1135 1136 desc = (*mode == 'w') ? "put" : "append"; 1137 if (unique && stat(name, &st) == 0 && 1138 (name = gunique(name)) == NULL) { 1139 logcmd(desc, -1, name, NULL, NULL, "cannot create unique file"); 1140 goto cleanupstore; 1141 } 1142 1143 if (restart_point) 1144 mode = "r+"; 1145 fout = fopen(name, mode); 1146 closefunc = fclose; 1147 tdp = NULL; 1148 if (fout == NULL) { 1149 perror_reply(553, name); 1150 logcmd(desc, -1, name, NULL, NULL, strerror(errno)); 1151 goto cleanupstore; 1152 } 1153 byte_count = -1; 1154 if (restart_point) { 1155 if (type == TYPE_A) { 1156 off_t i; 1157 int c; 1158 1159 for (i = 0; i < restart_point; i++) { 1160 if ((c=getc(fout)) == EOF) { 1161 perror_reply(550, name); 1162 goto done; 1163 } 1164 if (c == '\n') 1165 i++; 1166 } 1167 /* 1168 * We must do this seek to "current" position 1169 * because we are changing from reading to 1170 * writing. 1171 */ 1172 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1173 perror_reply(550, name); 1174 goto done; 1175 } 1176 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1177 perror_reply(550, name); 1178 goto done; 1179 } 1180 } 1181 din = dataconn(name, (off_t)-1, "r"); 1182 if (din == NULL) 1183 goto done; 1184 (void)gettimeofday(&start, NULL); 1185 if (receive_data(din, fout) == 0) { 1186 if (unique) 1187 reply(226, "Transfer complete (unique file name:%s).", 1188 name); 1189 else 1190 reply(226, "Transfer complete."); 1191 } 1192 (void)gettimeofday(&finish, NULL); 1193 (void) fclose(din); 1194 timersub(&finish, &start, &td); 1195 tdp = &td; 1196 data = -1; 1197 done: 1198 logcmd(desc, byte_count, name, NULL, tdp, NULL); 1199 (*closefunc)(fout); 1200 cleanupstore: 1201 if (pdata >= 0) 1202 (void)close(pdata); 1203 pdata = -1; 1204 } 1205 1206 static FILE * 1207 getdatasock(const char *mode) 1208 { 1209 int on = 1, s, t, tries; 1210 1211 if (data >= 0) 1212 return (fdopen(data, mode)); 1213 (void) seteuid((uid_t)0); 1214 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1215 if (s < 0) 1216 goto bad; 1217 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1218 (char *) &on, sizeof(on)) < 0) 1219 goto bad; 1220 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1221 (char *) &on, sizeof(on)) < 0) 1222 goto bad; 1223 /* anchor socket to avoid multi-homing problems */ 1224 data_source = ctrl_addr; 1225 data_source.su_port = htons(20); /* ftp-data port */ 1226 for (tries = 1; ; tries++) { 1227 if (bind(s, (struct sockaddr *)&data_source, 1228 data_source.su_len) >= 0) 1229 break; 1230 if (errno != EADDRINUSE || tries > 10) 1231 goto bad; 1232 sleep(tries); 1233 } 1234 (void) seteuid((uid_t)pw->pw_uid); 1235 #ifdef IP_TOS 1236 if (!mapped && ctrl_addr.su_family == AF_INET) { 1237 on = IPTOS_THROUGHPUT; 1238 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1239 sizeof(int)) < 0) 1240 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1241 } 1242 #endif 1243 return (fdopen(s, mode)); 1244 bad: 1245 /* Return the real value of errno (close may change it) */ 1246 t = errno; 1247 (void) seteuid((uid_t)pw->pw_uid); 1248 (void) close(s); 1249 errno = t; 1250 return (NULL); 1251 } 1252 1253 FILE * 1254 dataconn(const char *name, off_t size, const char *mode) 1255 { 1256 char sizebuf[32]; 1257 FILE *file; 1258 int retry = 0, tos, keepalive; 1259 1260 file_size = size; 1261 byte_count = 0; 1262 if (size != (off_t) -1) 1263 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd byte%s)", 1264 (qdfmt_t)size, PLURAL(size)); 1265 else 1266 sizebuf[0] = '\0'; 1267 if (pdata >= 0) { 1268 union sockunion from; 1269 int s, fromlen = sizeof(from); 1270 1271 (void) alarm(curclass.timeout); 1272 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1273 (void) alarm(0); 1274 if (s < 0) { 1275 reply(425, "Can't open data connection."); 1276 (void) close(pdata); 1277 pdata = -1; 1278 return (NULL); 1279 } 1280 (void) close(pdata); 1281 pdata = s; 1282 switch (from.su_family) { 1283 case AF_INET: 1284 #ifdef IP_TOS 1285 if (!mapped) { 1286 tos = IPTOS_THROUGHPUT; 1287 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1288 (char *)&tos, sizeof(int)); 1289 } 1290 break; 1291 #endif 1292 } 1293 /* Set keepalives on the socket to detect dropped conns. */ 1294 #ifdef SO_KEEPALIVE 1295 keepalive = 1; 1296 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1297 (char *)&keepalive, sizeof(int)); 1298 #endif 1299 reply(150, "Opening %s mode data connection for '%s'%s.", 1300 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1301 return (fdopen(pdata, mode)); 1302 } 1303 if (data >= 0) { 1304 reply(125, "Using existing data connection for '%s'%s.", 1305 name, sizebuf); 1306 usedefault = 1; 1307 return (fdopen(data, mode)); 1308 } 1309 if (usedefault) 1310 data_dest = his_addr; 1311 usedefault = 1; 1312 file = getdatasock(mode); 1313 if (file == NULL) { 1314 char hbuf[INET6_ADDRSTRLEN]; 1315 char pbuf[10]; 1316 getnameinfo((struct sockaddr *)&data_source, data_source.su_len, 1317 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1318 NI_NUMERICHOST | NI_NUMERICSERV); 1319 reply(425, "Can't create data socket (%s,%s): %s.", 1320 hbuf, pbuf, strerror(errno)); 1321 return (NULL); 1322 } 1323 data = fileno(file); 1324 while (connect(data, (struct sockaddr *)&data_dest, 1325 data_dest.su_len) < 0) { 1326 if (errno == EADDRINUSE && retry < swaitmax) { 1327 sleep((unsigned) swaitint); 1328 retry += swaitint; 1329 continue; 1330 } 1331 perror_reply(425, "Can't build data connection"); 1332 (void) fclose(file); 1333 data = -1; 1334 return (NULL); 1335 } 1336 reply(150, "Opening %s mode data connection for '%s'%s.", 1337 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1338 return (file); 1339 } 1340 1341 /* 1342 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1343 * encapsulation of the data subject * to Mode, Structure, and Type. 1344 * 1345 * NB: Form isn't handled. 1346 */ 1347 static int 1348 send_data(FILE *instr, FILE *outstr, off_t blksize, int isdata) 1349 { 1350 int c, filefd, netfd, rval; 1351 char *buf; 1352 1353 transflag = 1; 1354 rval = -1; 1355 buf = NULL; 1356 if (setjmp(urgcatch)) 1357 goto cleanup_send_data; 1358 1359 switch (type) { 1360 1361 case TYPE_A: 1362 /* XXXX: rate limit ascii send (get) */ 1363 (void) alarm(curclass.timeout); 1364 while ((c = getc(instr)) != EOF) { 1365 byte_count++; 1366 if (c == '\n') { 1367 if (ferror(outstr)) 1368 goto data_err; 1369 (void) putc('\r', outstr); 1370 if (isdata) { 1371 total_data_out++; 1372 total_data++; 1373 } 1374 total_bytes_out++; 1375 total_bytes++; 1376 } 1377 (void) putc(c, outstr); 1378 if (isdata) { 1379 total_data_out++; 1380 total_data++; 1381 } 1382 total_bytes_out++; 1383 total_bytes++; 1384 if ((byte_count % 4096) == 0) 1385 (void) alarm(curclass.timeout); 1386 } 1387 (void) alarm(0); 1388 fflush(outstr); 1389 if (ferror(instr)) 1390 goto file_err; 1391 if (ferror(outstr)) 1392 goto data_err; 1393 rval = 0; 1394 goto cleanup_send_data; 1395 1396 case TYPE_I: 1397 case TYPE_L: 1398 if ((buf = malloc((size_t)blksize)) == NULL) { 1399 perror_reply(451, "Local resource failure: malloc"); 1400 goto cleanup_send_data; 1401 } 1402 filefd = fileno(instr); 1403 netfd = fileno(outstr); 1404 (void) alarm(curclass.timeout); 1405 if (curclass.rateget) { 1406 while (1) { 1407 int d; 1408 struct timeval then, now, td; 1409 off_t bufrem; 1410 char *bufp; 1411 1412 (void)gettimeofday(&then, NULL); 1413 errno = c = d = 0; 1414 bufrem = curclass.rateget; 1415 while (bufrem > 0) { 1416 if ((c = read(filefd, buf, 1417 MIN(blksize, bufrem))) <= 0) 1418 goto senddone; 1419 (void) alarm(curclass.timeout); 1420 bufrem -= c; 1421 byte_count += c; 1422 if (isdata) { 1423 total_data_out += c; 1424 total_data += c; 1425 } 1426 total_bytes_out += c; 1427 total_bytes += c; 1428 for (bufp = buf; c > 0; 1429 c -= d, bufp += d) 1430 if ((d = 1431 write(netfd, bufp, c)) <= 0) 1432 break; 1433 if (d < 0) 1434 goto data_err; 1435 } 1436 (void)gettimeofday(&now, NULL); 1437 timersub(&now, &then, &td); 1438 if (td.tv_sec > 0) 1439 break; 1440 usleep(1000000 - td.tv_usec); 1441 } 1442 } else { 1443 while ((c = read(filefd, buf, (size_t)blksize)) > 0) { 1444 if (write(netfd, buf, c) != c) 1445 goto data_err; 1446 (void) alarm(curclass.timeout); 1447 byte_count += c; 1448 if (isdata) { 1449 total_data_out += c; 1450 total_data += c; 1451 } 1452 total_bytes_out += c; 1453 total_bytes += c; 1454 } 1455 } 1456 senddone: 1457 if (c < 0) 1458 goto file_err; 1459 rval = 0; 1460 goto cleanup_send_data; 1461 1462 default: 1463 reply(550, "Unimplemented TYPE %d in send_data", type); 1464 goto cleanup_send_data; 1465 } 1466 1467 data_err: 1468 (void) alarm(0); 1469 perror_reply(426, "Data connection"); 1470 goto cleanup_send_data; 1471 1472 file_err: 1473 (void) alarm(0); 1474 perror_reply(551, "Error on input file"); 1475 /* FALLTHROUGH */ 1476 1477 cleanup_send_data: 1478 (void) alarm(0); 1479 transflag = 0; 1480 if (buf) 1481 free(buf); 1482 if (isdata) { 1483 total_files_out++; 1484 total_files++; 1485 } 1486 total_xfers_out++; 1487 total_xfers++; 1488 return (rval); 1489 } 1490 1491 /* 1492 * Transfer data from peer to "outstr" using the appropriate encapulation of 1493 * the data subject to Mode, Structure, and Type. 1494 * 1495 * N.B.: Form isn't handled. 1496 */ 1497 static int 1498 receive_data(FILE *instr, FILE *outstr) 1499 { 1500 int c, bare_lfs, netfd, filefd, rval; 1501 char buf[BUFSIZ]; 1502 #ifdef __GNUC__ 1503 (void) &bare_lfs; 1504 #endif 1505 1506 bare_lfs = 0; 1507 transflag = 1; 1508 rval = -1; 1509 if (setjmp(urgcatch)) 1510 goto cleanup_recv_data; 1511 1512 switch (type) { 1513 1514 case TYPE_I: 1515 case TYPE_L: 1516 netfd = fileno(instr); 1517 filefd = fileno(outstr); 1518 (void) alarm(curclass.timeout); 1519 if (curclass.rateput) { 1520 while (1) { 1521 int d; 1522 struct timeval then, now, td; 1523 off_t bufrem; 1524 1525 (void)gettimeofday(&then, NULL); 1526 errno = c = d = 0; 1527 for (bufrem = curclass.rateput; bufrem > 0; ) { 1528 if ((c = read(netfd, buf, 1529 MIN(sizeof(buf), bufrem))) <= 0) 1530 goto recvdone; 1531 if ((d = write(filefd, buf, c)) != c) 1532 goto recvdone; 1533 (void) alarm(curclass.timeout); 1534 bufrem -= c; 1535 byte_count += c; 1536 total_data_in += c; 1537 total_data += c; 1538 total_bytes_in += c; 1539 total_bytes += c; 1540 } 1541 (void)gettimeofday(&now, NULL); 1542 timersub(&now, &then, &td); 1543 if (td.tv_sec > 0) 1544 break; 1545 usleep(1000000 - td.tv_usec); 1546 } 1547 } else { 1548 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1549 if (write(filefd, buf, c) != c) 1550 goto file_err; 1551 (void) alarm(curclass.timeout); 1552 byte_count += c; 1553 total_data_in += c; 1554 total_data += c; 1555 total_bytes_in += c; 1556 total_bytes += c; 1557 } 1558 } 1559 recvdone: 1560 if (c < 0) 1561 goto data_err; 1562 rval = 0; 1563 goto cleanup_recv_data; 1564 1565 case TYPE_E: 1566 reply(553, "TYPE E not implemented."); 1567 goto cleanup_recv_data; 1568 1569 case TYPE_A: 1570 (void) alarm(curclass.timeout); 1571 /* XXXX: rate limit ascii receive (put) */ 1572 while ((c = getc(instr)) != EOF) { 1573 byte_count++; 1574 total_data_in++; 1575 total_data++; 1576 total_bytes_in++; 1577 total_bytes++; 1578 if ((byte_count % 4096) == 0) 1579 (void) alarm(curclass.timeout); 1580 if (c == '\n') 1581 bare_lfs++; 1582 while (c == '\r') { 1583 if (ferror(outstr)) 1584 goto data_err; 1585 if ((c = getc(instr)) != '\n') { 1586 byte_count++; 1587 total_data_in++; 1588 total_data++; 1589 total_bytes_in++; 1590 total_bytes++; 1591 if ((byte_count % 4096) == 0) 1592 (void) alarm(curclass.timeout); 1593 (void) putc ('\r', outstr); 1594 if (c == '\0' || c == EOF) 1595 goto contin2; 1596 } 1597 } 1598 (void) putc(c, outstr); 1599 contin2: ; 1600 } 1601 (void) alarm(0); 1602 fflush(outstr); 1603 if (ferror(instr)) 1604 goto data_err; 1605 if (ferror(outstr)) 1606 goto file_err; 1607 if (bare_lfs) { 1608 lreply(226, 1609 "WARNING! %d bare linefeeds received in ASCII mode", 1610 bare_lfs); 1611 lreply(0, "File may not have transferred correctly."); 1612 } 1613 rval = 0; 1614 goto cleanup_recv_data; 1615 1616 default: 1617 reply(550, "Unimplemented TYPE %d in receive_data", type); 1618 goto cleanup_recv_data; 1619 } 1620 1621 data_err: 1622 (void) alarm(0); 1623 perror_reply(426, "Data Connection"); 1624 goto cleanup_recv_data; 1625 1626 file_err: 1627 (void) alarm(0); 1628 perror_reply(452, "Error writing file"); 1629 goto cleanup_recv_data; 1630 1631 cleanup_recv_data: 1632 (void) alarm(0); 1633 transflag = 0; 1634 total_files_in++; 1635 total_files++; 1636 total_xfers_in++; 1637 total_xfers++; 1638 return (rval); 1639 } 1640 1641 void 1642 statcmd(void) 1643 { 1644 union sockunion *su = NULL; 1645 static char ntop_buf[INET6_ADDRSTRLEN]; 1646 u_char *a, *p; 1647 int ispassive, af; 1648 off_t otbi, otbo, otb; 1649 1650 a = p = (u_char *)NULL; 1651 1652 lreply(211, "%s FTP server status:", hostname); 1653 lreply(0, "Version: %s", FTPD_VERSION); 1654 ntop_buf[0] = '\0'; 1655 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1656 ntop_buf, sizeof(ntop_buf), NULL, 0, NI_NUMERICHOST) 1657 && strcmp(remotehost, ntop_buf) != 0) { 1658 lreply(0, "Connected to %s (%s)", remotehost, ntop_buf); 1659 } else 1660 lreply(0, "Connected to %s", remotehost); 1661 if (logged_in) { 1662 if (curclass.type == CLASS_GUEST) 1663 lreply(0, "Logged in anonymously"); 1664 else 1665 lreply(0, "Logged in as %s%s", pw->pw_name, 1666 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 1667 } else if (askpasswd) 1668 lreply(0, "Waiting for password"); 1669 else 1670 lreply(0, "Waiting for user name"); 1671 lreply(-2, " TYPE: %s", typenames[type]); 1672 if (type == TYPE_A || type == TYPE_E) 1673 lreply(-2, ", FORM: %s", formnames[form]); 1674 if (type == TYPE_L) { 1675 #if NBBY == 8 1676 lreply(-2, " %d", NBBY); 1677 #else 1678 /* XXX: `bytesize' needs to be defined in this case */ 1679 lreply(-2, " %d", bytesize); 1680 #endif 1681 } 1682 lreply(-1, "; STRUcture: %s; transfer MODE: %s", 1683 strunames[stru], modenames[mode]); 1684 ispassive = 0; 1685 if (data != -1) { 1686 lreply(0, "Data connection open"); 1687 su = NULL; 1688 } else if (pdata != -1) { 1689 lreply(0, "in Passive mode"); 1690 su = (union sockunion *)&pasv_addr; 1691 ispassive = 1; 1692 goto printaddr; 1693 } else if (usedefault == 0) { 1694 if (epsvall) { 1695 lreply(0, "EPSV only mode (EPSV ALL)"); 1696 goto epsvonly; 1697 } 1698 su = (union sockunion *)&data_dest; 1699 printaddr: 1700 /* PASV/PORT */ 1701 if (su->su_family == AF_INET) { 1702 a = (u_char *) &su->su_sin.sin_addr; 1703 p = (u_char *) &su->su_sin.sin_port; 1704 #define UC(b) (((int) b) & 0xff) 1705 lreply(0, "%s (%d,%d,%d,%d,%d,%d)", 1706 ispassive ? "PASV" : "PORT" , 1707 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1708 UC(p[0]), UC(p[1])); 1709 } 1710 1711 /* XXXLUKEM this code doesn't look right; speak to itojun */ 1712 1713 /* LPSV/LPRT */ 1714 { 1715 int alen, af, i; 1716 1717 alen = 0; 1718 switch (su->su_family) { 1719 case AF_INET: 1720 a = (u_char *) &su->su_sin.sin_addr; 1721 p = (u_char *) &su->su_sin.sin_port; 1722 alen = sizeof(su->su_sin.sin_addr); 1723 af = 4; 1724 break; 1725 case AF_INET6: 1726 a = (u_char *) &su->su_sin6.sin6_addr; 1727 p = (u_char *) &su->su_sin6.sin6_port; 1728 alen = sizeof(su->su_sin6.sin6_addr); 1729 af = 6; 1730 break; 1731 default: 1732 af = 0; 1733 break; 1734 } 1735 if (af) { 1736 lreply(-2, " %s (%d,%d", 1737 ispassive ? "LPSV" : "LPRT", af, alen); 1738 for (i = 0; i < alen; i++) 1739 lreply(-2, "%d,", UC(a[alen])); 1740 lreply(-1, "%d,%d,%d)", 2, UC(p[0]), UC(p[1])); 1741 #undef UC 1742 } 1743 } 1744 1745 /* EPRT/EPSV */ 1746 epsvonly: 1747 switch (su->su_family) { 1748 case AF_INET: 1749 af = 1; 1750 break; 1751 case AF_INET6: 1752 af = 2; 1753 break; 1754 default: 1755 af = 0; 1756 break; 1757 } 1758 if (af) { 1759 if (getnameinfo((struct sockaddr *)su, su->su_len, 1760 ntop_buf, sizeof(ntop_buf), NULL, 0, 1761 NI_NUMERICHOST) == 0) { 1762 lreply(0, "%s (|%d|%s|%d|)", 1763 ispassive ? "EPSV" : "EPRT", 1764 af, ntop_buf, ntohs(su->su_port)); 1765 } 1766 } 1767 } else 1768 lreply(0, "No data connection"); 1769 1770 if (logged_in) { 1771 lreply(0, "Data sent: %qd byte%s in %qd file%s", 1772 (qdfmt_t)total_data_out, PLURAL(total_data_out), 1773 (qdfmt_t)total_files_out, PLURAL(total_files_out)); 1774 lreply(0, "Data received: %qd byte%s in %qd file%s", 1775 (qdfmt_t)total_data_in, PLURAL(total_data_in), 1776 (qdfmt_t)total_files_in, PLURAL(total_files_in)); 1777 lreply(0, "Total data: %qd byte%s in %qd file%s", 1778 (qdfmt_t)total_data, PLURAL(total_data), 1779 (qdfmt_t)total_files, PLURAL(total_files)); 1780 } 1781 otbi = total_bytes_in; 1782 otbo = total_bytes_out; 1783 otb = total_bytes; 1784 lreply(0, "Traffic sent: %qd byte%s in %qd transfer%s", 1785 (qdfmt_t)otbo, PLURAL(otbo), 1786 (qdfmt_t)total_xfers_out, PLURAL(total_xfers_out)); 1787 lreply(0, "Traffic received: %qd byte%s in %qd transfer%s", 1788 (qdfmt_t)otbi, PLURAL(otbi), 1789 (qdfmt_t)total_xfers_in, PLURAL(total_xfers_in)); 1790 lreply(0, "Total traffic: %qd byte%s in %qd transfer%s", 1791 (qdfmt_t)otb, PLURAL(otb), 1792 (qdfmt_t)total_xfers, PLURAL(total_xfers)); 1793 1794 if (logged_in) { 1795 struct ftpconv *cp; 1796 1797 lreply(0, ""); 1798 lreply(0, "Class: %s, type: %s", 1799 curclass.classname, CURCLASSTYPE); 1800 lreply(0, "Check PORT/LPRT commands: %sabled", 1801 curclass.checkportcmd ? "en" : "dis"); 1802 if (curclass.display != NULL) 1803 lreply(0, "Display file: %s", curclass.display); 1804 if (curclass.notify != NULL) 1805 lreply(0, "Notify fileglob: %s", curclass.notify); 1806 lreply(0, "Idle timeout: %d, maximum timeout: %d", 1807 curclass.timeout, curclass.maxtimeout); 1808 lreply(0, "Current connections: %d", connections); 1809 if (curclass.limit == -1) 1810 lreply(0, "Maximum connections: unlimited"); 1811 else 1812 lreply(0, "Maximum connections: %d", curclass.limit); 1813 if (curclass.limitfile) 1814 lreply(0, "Connection limit exceeded file: %s", 1815 curclass.limitfile); 1816 if (curclass.motd != NULL) 1817 lreply(0, "MotD file: %s", curclass.motd); 1818 lreply(0, 1819 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 1820 curclass.modify ? "en" : "dis"); 1821 lreply(0, 1822 "Upload commands (APPE, STOR, STOU): %sabled", 1823 curclass.upload ? "en" : "dis"); 1824 if (curclass.portmin && curclass.portmax) 1825 lreply(0, "PASV port range: %d - %d", 1826 curclass.portmin, curclass.portmax); 1827 if (curclass.rateget) 1828 lreply(0, "Rate get limit: %d bytes/sec", 1829 curclass.rateget); 1830 else 1831 lreply(0, "Rate get limit: disabled"); 1832 if (curclass.rateput) 1833 lreply(0, "Rate put limit: %d bytes/sec", 1834 curclass.rateput); 1835 else 1836 lreply(0, "Rate put limit: disabled"); 1837 lreply(0, "Umask: %.04o", curclass.umask); 1838 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1839 if (cp->suffix == NULL || cp->types == NULL || 1840 cp->command == NULL) 1841 continue; 1842 lreply(0, 1843 "Conversion: %s [%s] disable: %s, command: %s", 1844 cp->suffix, cp->types, cp->disable, cp->command); 1845 } 1846 } 1847 1848 reply(211, "End of status"); 1849 } 1850 1851 void 1852 fatal(const char *s) 1853 { 1854 1855 reply(451, "Error in server: %s\n", s); 1856 reply(221, "Closing connection due to server error."); 1857 dologout(0); 1858 /* NOTREACHED */ 1859 } 1860 1861 /* 1862 * reply() -- 1863 * display the final line of a reply, with a trailing CRLF 1864 * i.e, n + " " + fmt + CRLF 1865 */ 1866 void 1867 reply(int n, const char *fmt, ...) 1868 { 1869 off_t b; 1870 va_list ap; 1871 1872 va_start(ap, fmt); 1873 b = 0; 1874 b += printf("%d ", n); 1875 b += vprintf(fmt, ap); 1876 b += printf("\r\n"); 1877 total_bytes += b; 1878 total_bytes_out += b; 1879 (void)fflush(stdout); 1880 if (debug) { 1881 syslog(LOG_DEBUG, "<--- %d ", n); 1882 vsyslog(LOG_DEBUG, fmt, ap); 1883 } 1884 } 1885 1886 /* 1887 * lreply() -- 1888 * depending on the value of n, display a line with a trailing CRLF: 1889 * n == -2 freeform text, but no trailing CRLF 1890 * n == -1 freeform text 1891 * n == 0 prefix the message with 4 spaces 1892 * n > 0 prefix the message with n + "-" 1893 */ 1894 void 1895 lreply(int n, const char *fmt, ...) 1896 { 1897 off_t b; 1898 va_list ap; 1899 1900 va_start(ap, fmt); 1901 b = 0; 1902 switch (n) { 1903 case 0: 1904 b += printf(" "); 1905 case -1: 1906 case -2: 1907 break; 1908 default: 1909 b += printf("%d-", n); 1910 break; 1911 } 1912 b += vprintf(fmt, ap); 1913 if (n != -2) 1914 b += printf("\r\n"); 1915 total_bytes += b; 1916 total_bytes_out += b; 1917 if (n != -2) 1918 (void)fflush(stdout); 1919 if (debug && n >= 0) { 1920 syslog(LOG_DEBUG, "<--- %d- ", n); 1921 vsyslog(LOG_DEBUG, fmt, ap); 1922 } 1923 } 1924 1925 static void 1926 dolog(struct sockaddr *who) 1927 { 1928 getnameinfo(who, who->sa_len, remotehost, sizeof(remotehost), NULL,0,0); 1929 #ifdef HASSETPROCTITLE 1930 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1931 setproctitle(proctitle); 1932 #endif /* HASSETPROCTITLE */ 1933 if (logging) 1934 syslog(LOG_INFO, "connection from %s to %s", 1935 remotehost, hostname); 1936 } 1937 1938 /* 1939 * Record logout in wtmp file 1940 * and exit with supplied status. 1941 */ 1942 void 1943 dologout(int status) 1944 { 1945 /* 1946 * Prevent reception of SIGURG from resulting in a resumption 1947 * back to the main program loop. 1948 */ 1949 transflag = 0; 1950 1951 if (logged_in) { 1952 (void) seteuid((uid_t)0); 1953 logwtmp(ttyline, "", ""); 1954 if (doutmp) 1955 logout(utmp.ut_line); 1956 #ifdef KERBEROS 1957 if (!notickets && krbtkfile_env) 1958 unlink(krbtkfile_env); 1959 #endif 1960 } 1961 /* beware of flushing buffers after a SIGPIPE */ 1962 _exit(status); 1963 } 1964 1965 static void 1966 myoob(int signo) 1967 { 1968 char *cp; 1969 1970 /* only process if transfer occurring */ 1971 if (!transflag) 1972 return; 1973 cp = tmpline; 1974 if (getline(cp, 7, stdin) == NULL) { 1975 reply(221, "You could at least say goodbye."); 1976 dologout(0); 1977 } 1978 if (strcasecmp(cp, "ABOR\r\n") == 0) { 1979 tmpline[0] = '\0'; 1980 reply(426, "Transfer aborted. Data connection closed."); 1981 reply(226, "Abort successful"); 1982 longjmp(urgcatch, 1); 1983 } 1984 if (strcasecmp(cp, "STAT\r\n") == 0) { 1985 tmpline[0] = '\0'; 1986 if (file_size != (off_t) -1) 1987 reply(213, "Status: %qd of %qd byte%s transferred", 1988 (qdfmt_t)byte_count, (qdfmt_t)file_size, 1989 PLURAL(byte_count)); 1990 else 1991 reply(213, "Status: %qd byte%s transferred", 1992 (qdfmt_t)byte_count, PLURAL(byte_count)); 1993 } 1994 } 1995 1996 static int 1997 bind_pasv_addr(void) 1998 { 1999 static int passiveport; 2000 int port, len; 2001 2002 len = pasv_addr.su_len; 2003 if (curclass.portmin == 0 && curclass.portmax == 0) { 2004 pasv_addr.su_port = 0; 2005 return (bind(pdata, (struct sockaddr *)&pasv_addr, len)); 2006 } 2007 2008 if (passiveport == 0) { 2009 srand(getpid()); 2010 passiveport = rand() % (curclass.portmax - curclass.portmin) 2011 + curclass.portmin; 2012 } 2013 2014 port = passiveport; 2015 while (1) { 2016 port++; 2017 if (port > curclass.portmax) 2018 port = curclass.portmin; 2019 else if (port == passiveport) { 2020 errno = EAGAIN; 2021 return (-1); 2022 } 2023 pasv_addr.su_port = htons(port); 2024 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) == 0) 2025 break; 2026 if (errno != EADDRINUSE) 2027 return (-1); 2028 } 2029 passiveport = port; 2030 return (0); 2031 } 2032 2033 /* 2034 * Note: a response of 425 is not mentioned as a possible response to 2035 * the PASV command in RFC959. However, it has been blessed as 2036 * a legitimate response by Jon Postel in a telephone conversation 2037 * with Rick Adams on 25 Jan 89. 2038 */ 2039 void 2040 passive(void) 2041 { 2042 int len; 2043 char *p, *a; 2044 2045 if (pdata >= 0) 2046 close(pdata); 2047 pdata = socket(AF_INET, SOCK_STREAM, 0); 2048 if (pdata < 0 || !logged_in) { 2049 perror_reply(425, "Can't open passive connection"); 2050 return; 2051 } 2052 pasv_addr = ctrl_addr; 2053 2054 if (bind_pasv_addr() < 0) 2055 goto pasv_error; 2056 len = pasv_addr.su_len; 2057 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2058 goto pasv_error; 2059 if (listen(pdata, 1) < 0) 2060 goto pasv_error; 2061 a = (char *) &pasv_addr.su_sin.sin_addr; 2062 p = (char *) &pasv_addr.su_port; 2063 2064 #define UC(b) (((int) b) & 0xff) 2065 2066 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2067 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2068 return; 2069 2070 pasv_error: 2071 (void) close(pdata); 2072 pdata = -1; 2073 perror_reply(425, "Can't open passive connection"); 2074 return; 2075 } 2076 2077 /* 2078 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2079 * 229 Entering Extended Passive Mode (|||port|) 2080 */ 2081 void 2082 long_passive(char *cmd, int pf) 2083 { 2084 int len; 2085 char *p, *a; 2086 2087 if (!logged_in) { 2088 syslog(LOG_NOTICE, "long passive but not logged in"); 2089 reply(503, "Login with USER first."); 2090 return; 2091 } 2092 2093 if (pf != PF_UNSPEC) { 2094 if (ctrl_addr.su_family != pf) { 2095 switch (ctrl_addr.su_family) { 2096 case AF_INET: 2097 pf = 1; 2098 break; 2099 case AF_INET6: 2100 pf = 2; 2101 break; 2102 default: 2103 pf = 0; 2104 break; 2105 } 2106 /* 2107 * XXX 2108 * only EPRT/EPSV ready clients will understand this 2109 */ 2110 if (strcmp(cmd, "EPSV") == 0 && pf) { 2111 reply(522, "Network protocol mismatch, " 2112 "use (%d)", pf); 2113 } else 2114 reply(501, "Network protocol mismatch"); /*XXX*/ 2115 2116 return; 2117 } 2118 } 2119 2120 if (pdata >= 0) 2121 close(pdata); 2122 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2123 if (pdata < 0) { 2124 perror_reply(425, "Can't open passive connection"); 2125 return; 2126 } 2127 pasv_addr = ctrl_addr; 2128 if (bind_pasv_addr() < 0) 2129 goto pasv_error; 2130 len = pasv_addr.su_len; 2131 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2132 goto pasv_error; 2133 if (listen(pdata, 1) < 0) 2134 goto pasv_error; 2135 p = (char *) &pasv_addr.su_port; 2136 2137 #define UC(b) (((int) b) & 0xff) 2138 2139 if (strcmp(cmd, "LPSV") == 0) { 2140 switch (pasv_addr.su_family) { 2141 case AF_INET: 2142 a = (char *) &pasv_addr.su_sin.sin_addr; 2143 reply(228, "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2144 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2145 2, UC(p[0]), UC(p[1])); 2146 return; 2147 case AF_INET6: 2148 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2149 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)", 2150 6, 16, 2151 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2152 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2153 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2154 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2155 2, UC(p[0]), UC(p[1])); 2156 return; 2157 } 2158 #undef UC 2159 } else if (strcmp(cmd, "EPSV") == 0) { 2160 switch (pasv_addr.su_family) { 2161 case AF_INET: 2162 case AF_INET6: 2163 reply(229, "Entering Extended Passive Mode (|||%d|)", 2164 ntohs(pasv_addr.su_port)); 2165 return; 2166 } 2167 } else { 2168 /* more proper error code? */ 2169 } 2170 2171 pasv_error: 2172 (void) close(pdata); 2173 pdata = -1; 2174 perror_reply(425, "Can't open passive connection"); 2175 return; 2176 } 2177 2178 /* 2179 * Generate unique name for file with basename "local". 2180 * The file named "local" is already known to exist. 2181 * Generates failure reply on error. 2182 * 2183 * XXX this function should under go changes similar to 2184 * the mktemp(3)/mkstemp(3) changes. 2185 */ 2186 static char * 2187 gunique(const char *local) 2188 { 2189 static char new[MAXPATHLEN]; 2190 struct stat st; 2191 char *cp; 2192 int count; 2193 2194 cp = strrchr(local, '/'); 2195 if (cp) 2196 *cp = '\0'; 2197 if (stat(cp ? local : ".", &st) < 0) { 2198 perror_reply(553, cp ? local : "."); 2199 return (NULL); 2200 } 2201 if (cp) 2202 *cp = '/'; 2203 for (count = 1; count < 100; count++) { 2204 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2205 if (stat(new, &st) < 0) 2206 return (new); 2207 } 2208 reply(452, "Unique file name cannot be created."); 2209 return (NULL); 2210 } 2211 2212 /* 2213 * Format and send reply containing system error number. 2214 */ 2215 void 2216 perror_reply(int code, const char *string) 2217 { 2218 int save_errno; 2219 2220 save_errno = errno; 2221 reply(code, "%s: %s.", string, strerror(errno)); 2222 errno = save_errno; 2223 } 2224 2225 static char *onefile[] = { 2226 "", 2227 0 2228 }; 2229 2230 void 2231 send_file_list(const char *whichf) 2232 { 2233 struct stat st; 2234 DIR *dirp = NULL; 2235 struct dirent *dir; 2236 FILE *dout = NULL; 2237 char **dirlist, *dirname, *p; 2238 int simple = 0; 2239 int freeglob = 0; 2240 glob_t gl; 2241 off_t b; 2242 2243 #ifdef __GNUC__ 2244 (void) &dout; 2245 (void) &dirlist; 2246 (void) &simple; 2247 (void) &freeglob; 2248 #endif 2249 2250 p = NULL; 2251 if (strpbrk(whichf, "~{[*?") != NULL) { 2252 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2253 2254 memset(&gl, 0, sizeof(gl)); 2255 freeglob = 1; 2256 if (glob(whichf, flags, 0, &gl)) { 2257 reply(550, "not found"); 2258 goto out; 2259 } else if (gl.gl_pathc == 0) { 2260 errno = ENOENT; 2261 perror_reply(550, whichf); 2262 goto out; 2263 } 2264 dirlist = gl.gl_pathv; 2265 } else { 2266 p = xstrdup(whichf); 2267 onefile[0] = p; 2268 dirlist = onefile; 2269 simple = 1; 2270 } 2271 /* XXX: } for vi sm */ 2272 2273 if (setjmp(urgcatch)) { 2274 transflag = 0; 2275 goto out; 2276 } 2277 while ((dirname = *dirlist++) != NULL) { 2278 int trailingslash = 0; 2279 2280 if (stat(dirname, &st) < 0) { 2281 /* 2282 * If user typed "ls -l", etc, and the client 2283 * used NLST, do what the user meant. 2284 */ 2285 /* XXX: nuke this support? */ 2286 if (dirname[0] == '-' && *dirlist == NULL && 2287 transflag == 0) { 2288 char *argv[] = { INTERNAL_LS, "", NULL }; 2289 2290 argv[1] = dirname; 2291 retrieve(argv, dirname); 2292 goto out; 2293 } 2294 perror_reply(550, whichf); 2295 if (dout != NULL) { 2296 (void) fclose(dout); 2297 transflag = 0; 2298 data = -1; 2299 if (pdata >= 0) 2300 (void)close(pdata); 2301 pdata = -1; 2302 } 2303 goto out; 2304 } 2305 2306 if (S_ISREG(st.st_mode)) { 2307 if (dout == NULL) { 2308 dout = dataconn("file list", (off_t)-1, "w"); 2309 if (dout == NULL) 2310 goto out; 2311 transflag++; 2312 } 2313 b = fprintf(dout, "%s%s\n", dirname, 2314 type == TYPE_A ? "\r" : ""); 2315 total_bytes += b; 2316 total_bytes_out += b; 2317 byte_count += strlen(dirname) + 1; 2318 continue; 2319 } else if (!S_ISDIR(st.st_mode)) 2320 continue; 2321 2322 if (dirname[strlen(dirname) - 1] == '/') 2323 trailingslash++; 2324 2325 if ((dirp = opendir(dirname)) == NULL) 2326 continue; 2327 2328 while ((dir = readdir(dirp)) != NULL) { 2329 char nbuf[MAXPATHLEN]; 2330 2331 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 2332 continue; 2333 2334 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2335 trailingslash ? "" : "/", dir->d_name); 2336 2337 /* 2338 * We have to do a stat to ensure it's 2339 * not a directory or special file. 2340 */ 2341 /* XXX: follow RFC959 and filter out non files ? */ 2342 if (simple || (stat(nbuf, &st) == 0 && 2343 S_ISREG(st.st_mode))) { 2344 char *p; 2345 2346 if (dout == NULL) { 2347 dout = dataconn("file list", (off_t)-1, 2348 "w"); 2349 if (dout == NULL) 2350 goto out; 2351 transflag++; 2352 } 2353 p = nbuf; 2354 if (nbuf[0] == '.' && nbuf[1] == '/') 2355 p = &nbuf[2]; 2356 b = fprintf(dout, "%s%s\n", p, 2357 type == TYPE_A ? "\r" : ""); 2358 total_bytes += b; 2359 total_bytes_out += b; 2360 byte_count += strlen(nbuf) + 1; 2361 } 2362 } 2363 (void) closedir(dirp); 2364 } 2365 2366 if (dout == NULL) 2367 reply(550, "No files found."); 2368 else if (ferror(dout) != 0) 2369 perror_reply(550, "Data connection"); 2370 else 2371 reply(226, "Transfer complete."); 2372 2373 transflag = 0; 2374 if (dout != NULL) 2375 (void) fclose(dout); 2376 else if (pdata >= 0) 2377 (void)close(pdata); 2378 data = -1; 2379 pdata = -1; 2380 out: 2381 total_xfers++; 2382 total_xfers_out++; 2383 if (p) 2384 free(p); 2385 if (freeglob) 2386 globfree(&gl); 2387 } 2388 2389 char * 2390 conffilename(const char *s) 2391 { 2392 static char filename[MAXPATHLEN]; 2393 2394 if (*s == '/') 2395 strlcpy(filename, s, sizeof(filename)); 2396 else 2397 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2398 return (filename); 2399 } 2400 2401 /* 2402 * logcmd -- 2403 * based on the arguments, syslog a message: 2404 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2405 * else if file2 != NULL "<command> <file1> <file2>" 2406 * else "<command> <file1>" 2407 * if elapsed != NULL, append "in xxx.yyy seconds" 2408 * if error != NULL, append ": " + error 2409 */ 2410 void 2411 logcmd(const char *command, off_t bytes, const char *file1, const char *file2, 2412 const struct timeval *elapsed, const char *error) 2413 { 2414 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN]; 2415 const char *p; 2416 size_t len; 2417 2418 if (logging <=1) 2419 return; 2420 2421 if ((p = realpath(file1, realfile)) == NULL) { 2422 #if 0 /* XXX: too noisy */ 2423 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2424 realfile, strerror(errno)); 2425 #endif 2426 p = file1; 2427 } 2428 len = snprintf(buf, sizeof(buf), "%s %s", command, p); 2429 2430 if (bytes != (off_t)-1) { 2431 len += snprintf(buf + len, sizeof(buf) - len, 2432 " = %qd byte%s", (qdfmt_t) bytes, PLURAL(bytes)); 2433 } else if (file2 != NULL) { 2434 if ((p = realpath(file2, realfile)) == NULL) { 2435 #if 0 /* XXX: too noisy */ 2436 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2437 realfile, strerror(errno)); 2438 #endif 2439 p = file2; 2440 } 2441 len += snprintf(buf + len, sizeof(buf) - len, " %s", p); 2442 } 2443 2444 if (elapsed != NULL) { 2445 len += snprintf(buf + len, sizeof(buf) - len, 2446 " in %ld.%.03d seconds", elapsed->tv_sec, 2447 (int)(elapsed->tv_usec / 1000)); 2448 } 2449 2450 if (error != NULL) 2451 len += snprintf(buf + len, sizeof(buf) - len, ": %s", error); 2452 2453 syslog(LOG_INFO, "%s", buf); 2454 } 2455 2456 char * 2457 xstrdup(const char *s) 2458 { 2459 char *new = strdup(s); 2460 2461 if (new == NULL) 2462 fatal("Local resource failure: malloc"); 2463 /* NOTREACHED */ 2464 return (new); 2465 } 2466
Indexes created Tue Sep 23 14:10:03 GMT 2025