ftpd.c revision 1.96
1 /* $NetBSD: ftpd.c,v 1.96 2000/06/20 07:39:46 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 1.96 2000/06/20 07:39:46 lukem Exp $"); 113 #endif 114 #endif /* not lint */ 115 116 /* 117 * FTP server. 118 */ 119 #include <sys/param.h> 120 #include <sys/stat.h> 121 #include <sys/ioctl.h> 122 #include <sys/socket.h> 123 #include <sys/wait.h> 124 125 #include <netinet/in.h> 126 #include <netinet/in_systm.h> 127 #include <netinet/ip.h> 128 129 #define FTP_NAMES 130 #include <arpa/ftp.h> 131 #include <arpa/inet.h> 132 #include <arpa/telnet.h> 133 134 #include <ctype.h> 135 #include <dirent.h> 136 #include <err.h> 137 #include <errno.h> 138 #include <fcntl.h> 139 #include <fnmatch.h> 140 #include <glob.h> 141 #include <grp.h> 142 #include <limits.h> 143 #include <netdb.h> 144 #include <pwd.h> 145 #include <setjmp.h> 146 #include <signal.h> 147 #include <stdarg.h> 148 #include <stdio.h> 149 #include <stdlib.h> 150 #include <string.h> 151 #include <syslog.h> 152 #include <time.h> 153 #include <unistd.h> 154 #include <util.h> 155 #include <utmp.h> 156 #ifdef SKEY 157 #include <skey.h> 158 #endif 159 #ifdef KERBEROS5 160 #include <com_err.h> 161 #include <krb5/krb5.h> 162 #endif 163 164 #define GLOBAL 165 #include "extern.h" 166 #include "pathnames.h" 167 #include "version.h" 168 169 int data; 170 jmp_buf urgcatch; 171 struct passwd *pw; 172 int sflag; 173 int stru; /* avoid C keyword */ 174 int mode; 175 int doutmp = 0; /* update utmp file */ 176 int mapped = 0; /* IPv4 connection on AF_INET6 socket */ 177 off_t file_size; 178 off_t byte_count; 179 static char ttyline[20]; 180 static struct utmp utmp; /* for utmp */ 181 182 static char *anondir = NULL; 183 static char confdir[MAXPATHLEN]; 184 185 #if defined(KERBEROS) || defined(KERBEROS5) 186 int has_ccache = 0; 187 int notickets = 1; 188 char *krbtkfile_env = NULL; 189 char *tty = ttyline; 190 int login_krb5_forwardable_tgt = 0; 191 #endif 192 193 int epsvall = 0; 194 195 /* 196 * Timeout intervals for retrying connections 197 * to hosts that don't accept PORT cmds. This 198 * is a kludge, but given the problems with TCP... 199 */ 200 #define SWAITMAX 90 /* wait at most 90 seconds */ 201 #define SWAITINT 5 /* interval between retries */ 202 203 int swaitmax = SWAITMAX; 204 int swaitint = SWAITINT; 205 206 static int bind_pasv_addr(void); 207 static int checkuser(const char *, const char *, int, int, char **); 208 static int checkaccess(const char *); 209 static void dolog(struct sockaddr *); 210 static void end_login(void); 211 static FILE *getdatasock(const char *); 212 static char *gunique(const char *); 213 static void lostconn(int); 214 static void myoob(int); 215 static int receive_data(FILE *, FILE *); 216 static int send_data(FILE *, FILE *, off_t, int); 217 static struct passwd *sgetpwnam(const char *); 218 219 int main(int, char *[]); 220 221 #if defined(KERBEROS) 222 int klogin(struct passwd *, char *, char *, char *); 223 void kdestroy(void); 224 #endif 225 #if defined(KERBEROS5) 226 int k5login(struct passwd *, char *, char *, char *); 227 void k5destroy(void); 228 #endif 229 230 int 231 main(int argc, char *argv[]) 232 { 233 int addrlen, ch, on = 1, tos, keepalive; 234 #ifdef KERBEROS5 235 krb5_error_code kerror; 236 #endif 237 238 connections = 1; 239 debug = 0; 240 logging = 0; 241 pdata = -1; 242 sflag = 0; 243 usedefault = 1; 244 (void)strcpy(confdir, _DEFAULT_CONFDIR); 245 hostname[0] = '\0'; 246 gidcount = 0; 247 248 while ((ch = getopt(argc, argv, "a:c:C:dh:lst:T:u:Uv")) != -1) { 249 switch (ch) { 250 case 'a': 251 anondir = optarg; 252 break; 253 254 case 'c': 255 (void)strlcpy(confdir, optarg, sizeof(confdir)); 256 break; 257 258 case 'C': 259 pw = sgetpwnam(optarg); 260 exit(checkaccess(optarg) ? 0 : 1); 261 /* NOTREACHED */ 262 263 case 'd': 264 case 'v': /* deprecated */ 265 debug = 1; 266 break; 267 268 case 'h': 269 strlcpy(hostname, optarg, sizeof(hostname)); 270 break; 271 272 case 'l': 273 logging++; /* > 1 == extra logging */ 274 break; 275 276 case 's': 277 sflag = 1; 278 break; 279 280 case 't': 281 case 'T': 282 case 'u': 283 warnx("-%c has been deprecated in favour of ftpd.conf", 284 ch); 285 break; 286 287 case 'U': 288 doutmp = 1; 289 break; 290 291 default: 292 if (optopt == 'a' || optopt == 'C') 293 exit(1); 294 warnx("unknown flag -%c ignored", optopt); 295 break; 296 } 297 } 298 299 /* 300 * LOG_NDELAY sets up the logging connection immediately, 301 * necessary for anonymous ftp's that chroot and can't do it later. 302 */ 303 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 304 addrlen = sizeof(his_addr); /* xxx */ 305 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 306 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 307 exit(1); 308 } 309 addrlen = sizeof(ctrl_addr); 310 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 311 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 312 exit(1); 313 } 314 if (his_addr.su_family == AF_INET6 315 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 316 #if 1 317 /* 318 * IPv4 control connection arrived to AF_INET6 socket. 319 * I hate to do this, but this is the easiest solution. 320 * 321 * The assumption is untrue on SIIT environment. 322 */ 323 union sockunion tmp_addr; 324 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 325 326 tmp_addr = his_addr; 327 memset(&his_addr, 0, sizeof(his_addr)); 328 his_addr.su_sin.sin_family = AF_INET; 329 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 330 memcpy(&his_addr.su_sin.sin_addr, 331 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 332 sizeof(his_addr.su_sin.sin_addr)); 333 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 334 335 tmp_addr = ctrl_addr; 336 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 337 ctrl_addr.su_sin.sin_family = AF_INET; 338 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 339 memcpy(&ctrl_addr.su_sin.sin_addr, 340 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 341 sizeof(ctrl_addr.su_sin.sin_addr)); 342 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 343 #else 344 while (fgets(line, sizeof(line), fd) != NULL) { 345 if ((cp = strchr(line, '\n')) != NULL) 346 *cp = '\0'; 347 reply(-530, "%s", line); 348 } 349 (void) fflush(stdout); 350 (void) fclose(fd); 351 reply(530, 352 "Connection from IPv4 mapped address is not supported."); 353 exit(0); 354 #endif 355 356 mapped = 1; 357 } else 358 mapped = 0; 359 #ifdef IP_TOS 360 if (!mapped && his_addr.su_family == AF_INET) { 361 tos = IPTOS_LOWDELAY; 362 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 363 sizeof(int)) < 0) 364 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 365 } 366 #endif 367 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 368 369 /* if the hostname hasn't been given, attempt to determine it */ 370 if (hostname[0] == '\0') { 371 if (getnameinfo((struct sockaddr *)&ctrl_addr, ctrl_addr.su_len, 372 hostname, sizeof(hostname), NULL, 0, 0) != 0) 373 (void)gethostname(hostname, sizeof(hostname)); 374 hostname[sizeof(hostname) - 1] = '\0'; 375 } 376 377 /* set this here so klogin can use it... */ 378 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 379 380 (void) freopen(_PATH_DEVNULL, "w", stderr); 381 (void) signal(SIGPIPE, lostconn); 382 (void) signal(SIGCHLD, SIG_IGN); 383 if (signal(SIGURG, myoob) == SIG_ERR) 384 syslog(LOG_ERR, "signal: %m"); 385 386 /* Try to handle urgent data inline */ 387 #ifdef SO_OOBINLINE 388 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 389 syslog(LOG_ERR, "setsockopt: %m"); 390 #endif 391 /* Set keepalives on the socket to detect dropped connections. */ 392 #ifdef SO_KEEPALIVE 393 keepalive = 1; 394 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 395 sizeof(int)) < 0) 396 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 397 #endif 398 399 #ifdef F_SETOWN 400 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 401 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 402 #endif 403 dolog((struct sockaddr *)&his_addr); 404 /* 405 * Set up default state 406 */ 407 data = -1; 408 type = TYPE_A; 409 form = FORM_N; 410 stru = STRU_F; 411 mode = MODE_S; 412 tmpline[0] = '\0'; 413 hasyyerrored = 0; 414 415 #ifdef KERBEROS5 416 kerror = krb5_init_context(&kcontext); 417 if (kerror) { 418 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 419 error_message(kerror)); 420 exit(0); 421 } 422 #endif /* KERBEROS5 */ 423 424 init_curclass(); 425 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 426 curclass.type = CLASS_REAL; 427 428 /* If logins are disabled, print out the message. */ 429 if (format_file(_PATH_NOLOGIN, 530)) { 430 reply(530, "System not available."); 431 exit(0); 432 } 433 (void)format_file(conffilename(_PATH_FTPWELCOME), 220); 434 /* reply(220,) must follow */ 435 reply(220, "%s FTP server (%s) ready.", hostname, FTPD_VERSION); 436 437 (void) setjmp(errcatch); 438 for (;;) 439 (void) yyparse(); 440 /* NOTREACHED */ 441 } 442 443 static void 444 lostconn(int signo) 445 { 446 447 if (debug) 448 syslog(LOG_DEBUG, "lost connection"); 449 dologout(1); 450 } 451 452 /* 453 * Save the result of a getpwnam. Used for USER command, since 454 * the data returned must not be clobbered by any other command 455 * (e.g., globbing). 456 */ 457 static struct passwd * 458 sgetpwnam(const char *name) 459 { 460 static struct passwd save; 461 struct passwd *p; 462 463 if ((p = getpwnam(name)) == NULL) 464 return (p); 465 if (save.pw_name) { 466 free((char *)save.pw_name); 467 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 468 free((char *)save.pw_passwd); 469 free((char *)save.pw_gecos); 470 free((char *)save.pw_dir); 471 free((char *)save.pw_shell); 472 } 473 save = *p; 474 save.pw_name = xstrdup(p->pw_name); 475 save.pw_passwd = xstrdup(p->pw_passwd); 476 save.pw_gecos = xstrdup(p->pw_gecos); 477 save.pw_dir = xstrdup(p->pw_dir); 478 save.pw_shell = xstrdup(p->pw_shell); 479 return (&save); 480 } 481 482 static int login_attempts; /* number of failed login attempts */ 483 static int askpasswd; /* had user command, ask for passwd */ 484 static char curname[10]; /* current USER name */ 485 486 /* 487 * USER command. 488 * Sets global passwd pointer pw if named account exists and is acceptable; 489 * sets askpasswd if a PASS command is expected. If logged in previously, 490 * need to reset state. If name is "ftp" or "anonymous", the name is not in 491 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 492 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 493 * requesting login privileges. Disallow anyone who does not have a standard 494 * shell as returned by getusershell(). Disallow anyone mentioned in the file 495 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 496 */ 497 void 498 user(const char *name) 499 { 500 if (logged_in) { 501 switch (curclass.type) { 502 case CLASS_GUEST: 503 reply(530, "Can't change user from guest login."); 504 return; 505 case CLASS_CHROOT: 506 reply(530, "Can't change user from chroot user."); 507 return; 508 case CLASS_REAL: 509 end_login(); 510 break; 511 default: 512 abort(); 513 } 514 } 515 516 #if defined(KERBEROS) 517 kdestroy(); 518 #endif 519 #if defined(KERBEROS5) 520 k5destroy(); 521 #endif 522 523 curclass.type = CLASS_REAL; 524 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 525 /* need `pw' setup for checkaccess() and checkuser () */ 526 if ((pw = sgetpwnam("ftp")) == NULL) 527 reply(530, "User %s unknown.", name); 528 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 529 reply(530, "User %s access denied.", name); 530 else { 531 curclass.type = CLASS_GUEST; 532 askpasswd = 1; 533 reply(331, 534 "Guest login ok, type your name as password."); 535 } 536 if (!askpasswd && logging) 537 syslog(LOG_NOTICE, 538 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 539 return; 540 } 541 542 pw = sgetpwnam(name); 543 if (logging) 544 strlcpy(curname, name, sizeof(curname)); 545 546 #ifdef SKEY 547 if (skey_haskey(name) == 0) { 548 char *myskey; 549 550 myskey = skey_keyinfo(name); 551 reply(331, "Password [%s] required for %s.", 552 myskey ? myskey : "error getting challenge", name); 553 } else 554 #endif 555 reply(331, "Password required for %s.", name); 556 557 askpasswd = 1; 558 /* 559 * Delay before reading passwd after first failed 560 * attempt to slow down passwd-guessing programs. 561 */ 562 if (login_attempts) 563 sleep((unsigned) login_attempts); 564 } 565 566 /* 567 * Determine whether something is to happen (allow access, chroot) 568 * for a user. Each line is a shell-style glob followed by 569 * `yes' or `no'. 570 * 571 * For backward compatability, `allow' and `deny' are synonymns 572 * for `yes' and `no', respectively. 573 * 574 * Each glob is matched against the username in turn, and the first 575 * match found is used. If no match is found, the result is the 576 * argument `def'. If a match is found but without and explicit 577 * `yes'/`no', the result is the opposite of def. 578 * 579 * If the file doesn't exist at all, the result is the argument 580 * `nofile' 581 * 582 * Any line starting with `#' is considered a comment and ignored. 583 * 584 * Returns 0 if the user is denied, or 1 if they are allowed. 585 * 586 * NOTE: needs struct passwd *pw setup before use. 587 */ 588 int 589 checkuser(const char *fname, const char *name, int def, int nofile, 590 char **retclass) 591 { 592 FILE *fd; 593 int retval; 594 char *glob, *perm, *class, *buf, *p; 595 size_t len, line; 596 597 retval = def; 598 if (retclass != NULL) 599 *retclass = NULL; 600 if ((fd = fopen(conffilename(fname), "r")) == NULL) 601 return nofile; 602 603 line = 0; 604 for (; 605 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 606 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 607 free(buf), buf = NULL) { 608 glob = perm = class = NULL; 609 p = buf; 610 if (len < 1) 611 continue; 612 if (p[len - 1] == '\n') 613 p[--len] = '\0'; 614 if (EMPTYSTR(p)) 615 continue; 616 617 NEXTWORD(p, glob); 618 NEXTWORD(p, perm); 619 NEXTWORD(p, class); 620 if (EMPTYSTR(glob)) 621 continue; 622 if (!EMPTYSTR(class)) { 623 if (strcasecmp(class, "all") == 0 || 624 strcasecmp(class, "none") == 0) { 625 syslog(LOG_WARNING, 626 "%s line %d: illegal user-defined class `%s' - skipping entry", 627 fname, (int)line, class); 628 continue; 629 } 630 } 631 632 /* have a host specifier */ 633 if ((p = strchr(glob, '@')) != NULL) { 634 u_int32_t net, mask, addr; 635 int bits; 636 637 *p++ = '\0'; 638 /* check against network or CIDR */ 639 if (isdigit(*p) && 640 (bits = inet_net_pton(AF_INET, p, 641 &net, sizeof(net))) != -1) { 642 net = ntohl(net); 643 mask = 0xffffffffU << (32 - bits); 644 addr = ntohl(his_addr.su_sin.sin_addr.s_addr); 645 if ((addr & mask) != net) 646 continue; 647 648 /* check against hostname glob */ 649 } else if (fnmatch(p, remotehost, 0) != 0) 650 continue; 651 } 652 653 /* have a group specifier */ 654 if ((p = strchr(glob, ':')) != NULL) { 655 gid_t *groups, *ng; 656 int gsize, i, found; 657 658 *p++ = '\0'; 659 groups = NULL; 660 gsize = 16; 661 do { 662 ng = realloc(groups, gsize * sizeof(gid_t)); 663 if (ng == NULL) 664 fatal( 665 "Local resource failure: realloc"); 666 groups = ng; 667 } while (getgrouplist(pw->pw_name, pw->pw_gid, 668 groups, &gsize) == -1); 669 found = 0; 670 for (i = 0; i < gsize; i++) { 671 struct group *g; 672 673 if ((g = getgrgid(groups[i])) == NULL) 674 continue; 675 if (fnmatch(p, g->gr_name, 0) == 0) { 676 found = 1; 677 break; 678 } 679 } 680 free(groups); 681 if (!found) 682 continue; 683 } 684 685 /* check against username glob */ 686 if (fnmatch(glob, name, 0) != 0) 687 continue; 688 689 if (perm != NULL && 690 ((strcasecmp(perm, "allow") == 0) || 691 (strcasecmp(perm, "yes") == 0))) 692 retval = 1; 693 else if (perm != NULL && 694 ((strcasecmp(perm, "deny") == 0) || 695 (strcasecmp(perm, "no") == 0))) 696 retval = 0; 697 else 698 retval = !def; 699 if (!EMPTYSTR(class) && retclass != NULL) 700 *retclass = xstrdup(class); 701 free(buf); 702 break; 703 } 704 (void) fclose(fd); 705 return (retval); 706 } 707 708 /* 709 * Check if user is allowed by /etc/ftpusers 710 * returns 1 for yes, 0 for no 711 * 712 * NOTE: needs struct passwd *pw setup (for checkuser()) 713 */ 714 int 715 checkaccess(const char *name) 716 { 717 718 return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL)); 719 } 720 721 /* 722 * Terminate login as previous user, if any, resetting state; 723 * used when USER command is given or login fails. 724 */ 725 static void 726 end_login(void) 727 { 728 729 (void) seteuid((uid_t)0); 730 if (logged_in) { 731 logwtmp(ttyline, "", ""); 732 if (doutmp) 733 logout(utmp.ut_line); 734 } 735 pw = NULL; 736 logged_in = 0; 737 quietmessages = 0; 738 gidcount = 0; 739 curclass.type = CLASS_REAL; 740 } 741 742 void 743 pass(const char *passwd) 744 { 745 int rval; 746 const char *cp, *shell, *home; 747 char *class; 748 749 class = NULL; 750 if (logged_in || askpasswd == 0) { 751 reply(503, "Login with USER first."); 752 return; 753 } 754 askpasswd = 0; 755 if (curclass.type != CLASS_GUEST) { 756 /* "ftp" is only account allowed no password */ 757 if (pw == NULL) { 758 rval = 1; /* failure below */ 759 goto skip; 760 } 761 #if defined(KERBEROS) 762 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 763 rval = 0; 764 goto skip; 765 } 766 #endif 767 #if defined(KERBEROS5) 768 if (k5login(pw, "", hostname, (char *)passwd) == 0) { 769 rval = 0; 770 goto skip; 771 } 772 #endif 773 #ifdef SKEY 774 if (skey_haskey(pw->pw_name) == 0) { 775 char *p; 776 int r; 777 778 p = xstrdup(passwd); 779 r = skey_passcheck(pw->pw_name, p); 780 free(p); 781 if (r != -1) { 782 rval = 0; 783 goto skip; 784 } 785 } 786 #endif 787 if (!sflag && *pw->pw_passwd != '\0' && 788 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 789 rval = 0; 790 goto skip; 791 } 792 rval = 1; 793 794 skip: 795 if (pw != NULL && pw->pw_expire && time(NULL) >= pw->pw_expire) 796 rval = 2; 797 /* 798 * If rval > 0, the user failed the authentication check 799 * above. If rval == 0, either Kerberos or local authentication 800 * succeeded. 801 */ 802 if (rval) { 803 reply(530, rval == 2 ? "Password expired." : 804 "Login incorrect."); 805 if (logging) { 806 syslog(LOG_NOTICE, 807 "FTP LOGIN FAILED FROM %s", remotehost); 808 syslog(LOG_AUTHPRIV | LOG_NOTICE, 809 "FTP LOGIN FAILED FROM %s, %s", 810 remotehost, curname); 811 } 812 pw = NULL; 813 if (login_attempts++ >= 5) { 814 syslog(LOG_NOTICE, 815 "repeated login failures from %s", 816 remotehost); 817 exit(0); 818 } 819 return; 820 } 821 } 822 823 /* password was ok; see if anything else prevents login */ 824 if (! checkuser(_PATH_FTPUSERS, pw->pw_name, 1, 0, &class)) { 825 reply(530, "User %s may not use FTP.", pw->pw_name); 826 if (logging) 827 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 828 remotehost, pw->pw_name); 829 goto bad; 830 } 831 /* check for valid shell, if not guest user */ 832 if ((shell = pw->pw_shell) == NULL || *shell == 0) 833 shell = _PATH_BSHELL; 834 while ((cp = getusershell()) != NULL) 835 if (strcmp(cp, shell) == 0) 836 break; 837 endusershell(); 838 if (cp == NULL && curclass.type != CLASS_GUEST) { 839 reply(530, "User %s may not use FTP.", pw->pw_name); 840 if (logging) 841 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 842 remotehost, pw->pw_name); 843 goto bad; 844 } 845 846 login_attempts = 0; /* this time successful */ 847 if (setegid((gid_t)pw->pw_gid) < 0) { 848 reply(550, "Can't set gid."); 849 goto bad; 850 } 851 (void) initgroups(pw->pw_name, pw->pw_gid); 852 gidcount = getgroups(sizeof(gidlist), gidlist); 853 854 /* open wtmp before chroot */ 855 logwtmp(ttyline, pw->pw_name, remotehost); 856 857 /* open utmp before chroot */ 858 if (doutmp) { 859 memset((void *)&utmp, 0, sizeof(utmp)); 860 (void)time(&utmp.ut_time); 861 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 862 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 863 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 864 login(&utmp); 865 } 866 867 logged_in = 1; 868 869 /* check user in /etc/ftpchroot */ 870 if (checkuser(_PATH_FTPCHROOT, pw->pw_name, 0, 0, NULL)) { 871 if (curclass.type == CLASS_GUEST) { 872 syslog(LOG_NOTICE, 873 "Can't change guest user to chroot class; remove entry in %s", 874 _PATH_FTPCHROOT); 875 exit(1); 876 } 877 curclass.type = CLASS_CHROOT; 878 } 879 if (class == NULL) { 880 switch (curclass.type) { 881 case CLASS_GUEST: 882 class = xstrdup("guest"); 883 break; 884 case CLASS_CHROOT: 885 class = xstrdup("chroot"); 886 break; 887 case CLASS_REAL: 888 class = xstrdup("real"); 889 break; 890 default: 891 abort(); 892 } 893 } 894 895 /* parse ftpd.conf, setting up various parameters */ 896 parse_conf(class); 897 count_users(); 898 if (curclass.limit != -1 && connections > curclass.limit) { 899 if (! EMPTYSTR(curclass.limitfile)) 900 (void)format_file(conffilename(curclass.limitfile),530); 901 reply(530, 902 "User %s access denied, connection limit of %d reached.", 903 pw->pw_name, curclass.limit); 904 syslog(LOG_NOTICE, 905 "Maximum connection limit of %d for class %s reached, login refused", 906 curclass.limit, curclass.classname); 907 goto bad; 908 } 909 910 home = "/"; 911 switch (curclass.type) { 912 case CLASS_GUEST: 913 /* 914 * We MUST do a chdir() after the chroot. Otherwise 915 * the old current directory will be accessible as "." 916 * outside the new root! 917 */ 918 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 919 chdir("/") < 0) { 920 reply(550, "Can't set guest privileges."); 921 goto bad; 922 } 923 break; 924 case CLASS_CHROOT: 925 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 926 reply(550, "Can't change root."); 927 goto bad; 928 } 929 break; 930 case CLASS_REAL: 931 if (chdir(pw->pw_dir) < 0) { 932 if (chdir("/") < 0) { 933 reply(530, 934 "User %s: can't change directory to %s.", 935 pw->pw_name, pw->pw_dir); 936 goto bad; 937 } else 938 reply(-230, 939 "No directory! Logging in with home=/"); 940 } else 941 home = pw->pw_dir; 942 break; 943 } 944 if (seteuid((uid_t)pw->pw_uid) < 0) { 945 reply(550, "Can't set uid."); 946 goto bad; 947 } 948 setenv("HOME", home, 1); 949 950 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 951 quietmessages = 1; 952 953 /* 954 * Display a login message, if it exists. 955 * N.B. reply(230,) must follow the message. 956 */ 957 (void)format_file(conffilename(curclass.motd), 230); 958 show_chdir_messages(230); 959 if (curclass.type == CLASS_GUEST) { 960 reply(230, "Guest login ok, access restrictions apply."); 961 #ifdef HASSETPROCTITLE 962 snprintf(proctitle, sizeof(proctitle), 963 "%s: anonymous/%.*s", remotehost, 964 (int) (sizeof(proctitle) - sizeof(remotehost) - 965 sizeof(": anonymous/")), passwd); 966 setproctitle(proctitle); 967 #endif /* HASSETPROCTITLE */ 968 if (logging) 969 syslog(LOG_INFO, 970 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 971 remotehost, passwd, 972 curclass.classname, CURCLASSTYPE); 973 } else { 974 reply(230, "User %s logged in.", pw->pw_name); 975 #ifdef HASSETPROCTITLE 976 snprintf(proctitle, sizeof(proctitle), 977 "%s: %s", remotehost, pw->pw_name); 978 setproctitle(proctitle); 979 #endif /* HASSETPROCTITLE */ 980 if (logging) 981 syslog(LOG_INFO, 982 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 983 remotehost, pw->pw_name, 984 curclass.classname, CURCLASSTYPE); 985 } 986 (void) umask(curclass.umask); 987 goto cleanuppass; 988 bad: 989 /* Forget all about it... */ 990 end_login(); 991 cleanuppass: 992 if (class) 993 free(class); 994 } 995 996 void 997 retrieve(char *argv[], const char *name) 998 { 999 FILE *fin, *dout; 1000 struct stat st; 1001 int (*closefunc)(FILE *) = NULL; 1002 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1003 struct timeval start, finish, td, *tdp; 1004 const char *dispname; 1005 1006 sendrv = closerv = stderrfd = -1; 1007 isconversion = isdata = isls = log = 0; 1008 tdp = NULL; 1009 dispname = name; 1010 fin = dout = NULL; 1011 if (argv == NULL) { 1012 log = 1; 1013 isdata = 1; 1014 fin = fopen(name, "r"); 1015 closefunc = fclose; 1016 if (fin == NULL) 1017 argv = do_conversion(name); 1018 if (argv != NULL) { 1019 isconversion++; 1020 syslog(LOG_INFO, "get command: '%s' on '%s'", 1021 argv[0], name); 1022 } 1023 } 1024 if (argv != NULL) { 1025 char temp[MAXPATHLEN]; 1026 1027 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1028 isls = 1; 1029 stderrfd = -1; 1030 } else { 1031 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1032 stderrfd = mkstemp(temp); 1033 if (stderrfd != -1) 1034 (void)unlink(temp); 1035 } 1036 dispname = argv[0]; 1037 fin = ftpd_popen(argv, "r", stderrfd); 1038 closefunc = ftpd_pclose; 1039 st.st_size = -1; 1040 st.st_blksize = BUFSIZ; 1041 } 1042 if (fin == NULL) { 1043 if (errno != 0) { 1044 perror_reply(550, dispname); 1045 if (log) 1046 logcmd("get", -1, name, NULL, NULL, 1047 strerror(errno)); 1048 } 1049 goto cleanupretrieve; 1050 } 1051 byte_count = -1; 1052 if (argv == NULL 1053 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1054 reply(550, "%s: not a plain file.", dispname); 1055 goto done; 1056 } 1057 if (restart_point) { 1058 if (type == TYPE_A) { 1059 off_t i; 1060 int c; 1061 1062 for (i = 0; i < restart_point; i++) { 1063 if ((c=getc(fin)) == EOF) { 1064 perror_reply(550, dispname); 1065 goto done; 1066 } 1067 if (c == '\n') 1068 i++; 1069 } 1070 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1071 perror_reply(550, dispname); 1072 goto done; 1073 } 1074 } 1075 dout = dataconn(dispname, st.st_size, "w"); 1076 if (dout == NULL) 1077 goto done; 1078 1079 (void)gettimeofday(&start, NULL); 1080 sendrv = send_data(fin, dout, st.st_blksize, isdata); 1081 (void)gettimeofday(&finish, NULL); 1082 (void) fclose(dout); /* close now to affect timing stats */ 1083 dout = NULL; 1084 timersub(&finish, &start, &td); 1085 tdp = &td; 1086 done: 1087 if (log) 1088 logcmd("get", byte_count, name, NULL, tdp, NULL); 1089 closerv = (*closefunc)(fin); 1090 if (sendrv == 0) { 1091 FILE *err; 1092 struct stat sb; 1093 1094 if (!isls && argv != NULL && closerv != 0) { 1095 reply(-226, 1096 "Command returned an exit status of %d", 1097 closerv); 1098 if (isconversion) 1099 syslog(LOG_INFO, 1100 "retrieve command: '%s' returned %d", 1101 argv[0], closerv); 1102 } 1103 if (!isls && argv != NULL && stderrfd != -1 && 1104 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1105 ((err = fdopen(stderrfd, "r")) != NULL)) { 1106 char *cp, line[LINE_MAX]; 1107 1108 reply(-226, "Command error messages:"); 1109 rewind(err); 1110 while (fgets(line, sizeof(line), err) != NULL) { 1111 if ((cp = strchr(line, '\n')) != NULL) 1112 *cp = '\0'; 1113 reply(0, " %s", line); 1114 } 1115 (void) fflush(stdout); 1116 (void) fclose(err); 1117 /* a reply(226,) must follow */ 1118 } 1119 reply(226, "Transfer complete."); 1120 } 1121 cleanupretrieve: 1122 closedataconn(dout); 1123 if (stderrfd != -1) 1124 (void)close(stderrfd); 1125 if (isconversion) 1126 free(argv); 1127 } 1128 1129 void 1130 store(const char *name, const char *mode, int unique) 1131 { 1132 FILE *fout, *din; 1133 struct stat st; 1134 int (*closefunc)(FILE *); 1135 struct timeval start, finish, td, *tdp; 1136 char *desc; 1137 1138 din = NULL; 1139 desc = (*mode == 'w') ? "put" : "append"; 1140 if (unique && stat(name, &st) == 0 && 1141 (name = gunique(name)) == NULL) { 1142 logcmd(desc, -1, name, NULL, NULL, "cannot create unique file"); 1143 goto cleanupstore; 1144 } 1145 1146 if (restart_point) 1147 mode = "r+"; 1148 fout = fopen(name, mode); 1149 closefunc = fclose; 1150 tdp = NULL; 1151 if (fout == NULL) { 1152 perror_reply(553, name); 1153 logcmd(desc, -1, name, NULL, NULL, strerror(errno)); 1154 goto cleanupstore; 1155 } 1156 byte_count = -1; 1157 if (restart_point) { 1158 if (type == TYPE_A) { 1159 off_t i; 1160 int c; 1161 1162 for (i = 0; i < restart_point; i++) { 1163 if ((c=getc(fout)) == EOF) { 1164 perror_reply(550, name); 1165 goto done; 1166 } 1167 if (c == '\n') 1168 i++; 1169 } 1170 /* 1171 * We must do this seek to "current" position 1172 * because we are changing from reading to 1173 * writing. 1174 */ 1175 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1176 perror_reply(550, name); 1177 goto done; 1178 } 1179 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1180 perror_reply(550, name); 1181 goto done; 1182 } 1183 } 1184 din = dataconn(name, (off_t)-1, "r"); 1185 if (din == NULL) 1186 goto done; 1187 (void)gettimeofday(&start, NULL); 1188 if (receive_data(din, fout) == 0) { 1189 if (unique) 1190 reply(226, "Transfer complete (unique file name:%s).", 1191 name); 1192 else 1193 reply(226, "Transfer complete."); 1194 } 1195 (void)gettimeofday(&finish, NULL); 1196 (void) fclose(din); /* close now to affect timing stats */ 1197 din = NULL; 1198 timersub(&finish, &start, &td); 1199 tdp = &td; 1200 done: 1201 logcmd(desc, byte_count, name, NULL, tdp, NULL); 1202 (*closefunc)(fout); 1203 cleanupstore: 1204 closedataconn(din); 1205 } 1206 1207 static FILE * 1208 getdatasock(const char *mode) 1209 { 1210 int on = 1, s, t, tries; 1211 1212 if (data >= 0) 1213 return (fdopen(data, mode)); 1214 (void) seteuid((uid_t)0); 1215 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1216 if (s < 0) 1217 goto bad; 1218 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1219 (char *) &on, sizeof(on)) < 0) 1220 goto bad; 1221 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1222 (char *) &on, sizeof(on)) < 0) 1223 goto bad; 1224 /* anchor socket to avoid multi-homing problems */ 1225 data_source = ctrl_addr; 1226 data_source.su_port = htons(20); /* ftp-data port */ 1227 for (tries = 1; ; tries++) { 1228 if (bind(s, (struct sockaddr *)&data_source, 1229 data_source.su_len) >= 0) 1230 break; 1231 if (errno != EADDRINUSE || tries > 10) 1232 goto bad; 1233 sleep(tries); 1234 } 1235 (void) seteuid((uid_t)pw->pw_uid); 1236 #ifdef IP_TOS 1237 if (!mapped && ctrl_addr.su_family == AF_INET) { 1238 on = IPTOS_THROUGHPUT; 1239 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1240 sizeof(int)) < 0) 1241 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1242 } 1243 #endif 1244 return (fdopen(s, mode)); 1245 bad: 1246 /* Return the real value of errno (close may change it) */ 1247 t = errno; 1248 (void) seteuid((uid_t)pw->pw_uid); 1249 (void) close(s); 1250 errno = t; 1251 return (NULL); 1252 } 1253 1254 FILE * 1255 dataconn(const char *name, off_t size, const char *mode) 1256 { 1257 char sizebuf[32]; 1258 FILE *file; 1259 int retry = 0, tos, keepalive; 1260 1261 file_size = size; 1262 byte_count = 0; 1263 if (size != (off_t) -1) 1264 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd byte%s)", 1265 (qdfmt_t)size, PLURAL(size)); 1266 else 1267 sizebuf[0] = '\0'; 1268 if (pdata >= 0) { 1269 union sockunion from; 1270 int s, fromlen = sizeof(from); 1271 1272 (void) alarm(curclass.timeout); 1273 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1274 (void) alarm(0); 1275 if (s < 0) { 1276 reply(425, "Can't open data connection."); 1277 (void) close(pdata); 1278 pdata = -1; 1279 return (NULL); 1280 } 1281 (void) close(pdata); 1282 pdata = s; 1283 switch (from.su_family) { 1284 case AF_INET: 1285 #ifdef IP_TOS 1286 if (!mapped) { 1287 tos = IPTOS_THROUGHPUT; 1288 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1289 (char *)&tos, sizeof(int)); 1290 } 1291 break; 1292 #endif 1293 } 1294 /* Set keepalives on the socket to detect dropped conns. */ 1295 #ifdef SO_KEEPALIVE 1296 keepalive = 1; 1297 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1298 (char *)&keepalive, sizeof(int)); 1299 #endif 1300 reply(150, "Opening %s mode data connection for '%s'%s.", 1301 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1302 return (fdopen(pdata, mode)); 1303 } 1304 if (data >= 0) { 1305 reply(125, "Using existing data connection for '%s'%s.", 1306 name, sizebuf); 1307 usedefault = 1; 1308 return (fdopen(data, mode)); 1309 } 1310 if (usedefault) 1311 data_dest = his_addr; 1312 usedefault = 1; 1313 file = getdatasock(mode); 1314 if (file == NULL) { 1315 char hbuf[INET6_ADDRSTRLEN]; 1316 char pbuf[10]; 1317 getnameinfo((struct sockaddr *)&data_source, data_source.su_len, 1318 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1319 NI_NUMERICHOST | NI_NUMERICSERV); 1320 reply(425, "Can't create data socket (%s,%s): %s.", 1321 hbuf, pbuf, strerror(errno)); 1322 return (NULL); 1323 } 1324 data = fileno(file); 1325 while (connect(data, (struct sockaddr *)&data_dest, 1326 data_dest.su_len) < 0) { 1327 if (errno == EADDRINUSE && retry < swaitmax) { 1328 sleep((unsigned) swaitint); 1329 retry += swaitint; 1330 continue; 1331 } 1332 perror_reply(425, "Can't build data connection"); 1333 (void) fclose(file); 1334 data = -1; 1335 return (NULL); 1336 } 1337 reply(150, "Opening %s mode data connection for '%s'%s.", 1338 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1339 return (file); 1340 } 1341 1342 void 1343 closedataconn(FILE *fd) 1344 { 1345 1346 if (fd != NULL) 1347 (void)fclose(fd); 1348 data = -1; 1349 if (pdata >= 0) 1350 (void)close(pdata); 1351 pdata = -1; 1352 } 1353 1354 /* 1355 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1356 * encapsulation of the data subject * to Mode, Structure, and Type. 1357 * 1358 * NB: Form isn't handled. 1359 */ 1360 static int 1361 send_data(FILE *instr, FILE *outstr, off_t blksize, int isdata) 1362 { 1363 int c, filefd, netfd, rval; 1364 char *buf; 1365 1366 transflag = 1; 1367 rval = -1; 1368 buf = NULL; 1369 if (setjmp(urgcatch)) 1370 goto cleanup_send_data; 1371 1372 switch (type) { 1373 1374 case TYPE_A: 1375 /* XXXX: rate limit ascii send (get) */ 1376 (void) alarm(curclass.timeout); 1377 while ((c = getc(instr)) != EOF) { 1378 byte_count++; 1379 if (c == '\n') { 1380 if (ferror(outstr)) 1381 goto data_err; 1382 (void) putc('\r', outstr); 1383 if (isdata) { 1384 total_data_out++; 1385 total_data++; 1386 } 1387 total_bytes_out++; 1388 total_bytes++; 1389 } 1390 (void) putc(c, outstr); 1391 if (isdata) { 1392 total_data_out++; 1393 total_data++; 1394 } 1395 total_bytes_out++; 1396 total_bytes++; 1397 if ((byte_count % 4096) == 0) 1398 (void) alarm(curclass.timeout); 1399 } 1400 (void) alarm(0); 1401 fflush(outstr); 1402 if (ferror(instr)) 1403 goto file_err; 1404 if (ferror(outstr)) 1405 goto data_err; 1406 rval = 0; 1407 goto cleanup_send_data; 1408 1409 case TYPE_I: 1410 case TYPE_L: 1411 if ((buf = malloc((size_t)blksize)) == NULL) { 1412 perror_reply(451, "Local resource failure: malloc"); 1413 goto cleanup_send_data; 1414 } 1415 filefd = fileno(instr); 1416 netfd = fileno(outstr); 1417 (void) alarm(curclass.timeout); 1418 if (curclass.rateget) { 1419 while (1) { 1420 int d; 1421 struct timeval then, now, td; 1422 off_t bufrem; 1423 char *bufp; 1424 1425 (void)gettimeofday(&then, NULL); 1426 errno = c = d = 0; 1427 bufrem = curclass.rateget; 1428 while (bufrem > 0) { 1429 if ((c = read(filefd, buf, 1430 MIN(blksize, bufrem))) <= 0) 1431 goto senddone; 1432 (void) alarm(curclass.timeout); 1433 bufrem -= c; 1434 byte_count += c; 1435 if (isdata) { 1436 total_data_out += c; 1437 total_data += c; 1438 } 1439 total_bytes_out += c; 1440 total_bytes += c; 1441 for (bufp = buf; c > 0; 1442 c -= d, bufp += d) 1443 if ((d = 1444 write(netfd, bufp, c)) <= 0) 1445 break; 1446 if (d < 0) 1447 goto data_err; 1448 } 1449 (void)gettimeofday(&now, NULL); 1450 timersub(&now, &then, &td); 1451 if (td.tv_sec == 0) 1452 usleep(1000000 - td.tv_usec); 1453 } 1454 } else { 1455 while ((c = read(filefd, buf, (size_t)blksize)) > 0) { 1456 if (write(netfd, buf, c) != c) 1457 goto data_err; 1458 (void) alarm(curclass.timeout); 1459 byte_count += c; 1460 if (isdata) { 1461 total_data_out += c; 1462 total_data += c; 1463 } 1464 total_bytes_out += c; 1465 total_bytes += c; 1466 } 1467 } 1468 senddone: 1469 if (c < 0) 1470 goto file_err; 1471 rval = 0; 1472 goto cleanup_send_data; 1473 1474 default: 1475 reply(550, "Unimplemented TYPE %d in send_data", type); 1476 goto cleanup_send_data; 1477 } 1478 1479 data_err: 1480 (void) alarm(0); 1481 perror_reply(426, "Data connection"); 1482 goto cleanup_send_data; 1483 1484 file_err: 1485 (void) alarm(0); 1486 perror_reply(551, "Error on input file"); 1487 /* FALLTHROUGH */ 1488 1489 cleanup_send_data: 1490 (void) alarm(0); 1491 transflag = 0; 1492 if (buf) 1493 free(buf); 1494 if (isdata) { 1495 total_files_out++; 1496 total_files++; 1497 } 1498 total_xfers_out++; 1499 total_xfers++; 1500 return (rval); 1501 } 1502 1503 /* 1504 * Transfer data from peer to "outstr" using the appropriate encapulation of 1505 * the data subject to Mode, Structure, and Type. 1506 * 1507 * N.B.: Form isn't handled. 1508 */ 1509 static int 1510 receive_data(FILE *instr, FILE *outstr) 1511 { 1512 int c, bare_lfs, netfd, filefd, rval; 1513 char buf[BUFSIZ]; 1514 #ifdef __GNUC__ 1515 (void) &bare_lfs; 1516 #endif 1517 1518 bare_lfs = 0; 1519 transflag = 1; 1520 rval = -1; 1521 if (setjmp(urgcatch)) 1522 goto cleanup_recv_data; 1523 1524 switch (type) { 1525 1526 case TYPE_I: 1527 case TYPE_L: 1528 netfd = fileno(instr); 1529 filefd = fileno(outstr); 1530 (void) alarm(curclass.timeout); 1531 if (curclass.rateput) { 1532 while (1) { 1533 int d; 1534 struct timeval then, now, td; 1535 off_t bufrem; 1536 1537 (void)gettimeofday(&then, NULL); 1538 errno = c = d = 0; 1539 for (bufrem = curclass.rateput; bufrem > 0; ) { 1540 if ((c = read(netfd, buf, 1541 MIN(sizeof(buf), bufrem))) <= 0) 1542 goto recvdone; 1543 if ((d = write(filefd, buf, c)) != c) 1544 goto recvdone; 1545 (void) alarm(curclass.timeout); 1546 bufrem -= c; 1547 byte_count += c; 1548 total_data_in += c; 1549 total_data += c; 1550 total_bytes_in += c; 1551 total_bytes += c; 1552 } 1553 (void)gettimeofday(&now, NULL); 1554 timersub(&now, &then, &td); 1555 if (td.tv_sec == 0) 1556 usleep(1000000 - td.tv_usec); 1557 } 1558 } else { 1559 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1560 if (write(filefd, buf, c) != c) 1561 goto file_err; 1562 (void) alarm(curclass.timeout); 1563 byte_count += c; 1564 total_data_in += c; 1565 total_data += c; 1566 total_bytes_in += c; 1567 total_bytes += c; 1568 } 1569 } 1570 recvdone: 1571 if (c < 0) 1572 goto data_err; 1573 rval = 0; 1574 goto cleanup_recv_data; 1575 1576 case TYPE_E: 1577 reply(553, "TYPE E not implemented."); 1578 goto cleanup_recv_data; 1579 1580 case TYPE_A: 1581 (void) alarm(curclass.timeout); 1582 /* XXXX: rate limit ascii receive (put) */ 1583 while ((c = getc(instr)) != EOF) { 1584 byte_count++; 1585 total_data_in++; 1586 total_data++; 1587 total_bytes_in++; 1588 total_bytes++; 1589 if ((byte_count % 4096) == 0) 1590 (void) alarm(curclass.timeout); 1591 if (c == '\n') 1592 bare_lfs++; 1593 while (c == '\r') { 1594 if (ferror(outstr)) 1595 goto data_err; 1596 if ((c = getc(instr)) != '\n') { 1597 byte_count++; 1598 total_data_in++; 1599 total_data++; 1600 total_bytes_in++; 1601 total_bytes++; 1602 if ((byte_count % 4096) == 0) 1603 (void) alarm(curclass.timeout); 1604 (void) putc ('\r', outstr); 1605 if (c == '\0' || c == EOF) 1606 goto contin2; 1607 } 1608 } 1609 (void) putc(c, outstr); 1610 contin2: ; 1611 } 1612 (void) alarm(0); 1613 fflush(outstr); 1614 if (ferror(instr)) 1615 goto data_err; 1616 if (ferror(outstr)) 1617 goto file_err; 1618 if (bare_lfs) { 1619 reply(-226, 1620 "WARNING! %d bare linefeeds received in ASCII mode", 1621 bare_lfs); 1622 reply(0, "File may not have transferred correctly."); 1623 } 1624 rval = 0; 1625 goto cleanup_recv_data; 1626 1627 default: 1628 reply(550, "Unimplemented TYPE %d in receive_data", type); 1629 goto cleanup_recv_data; 1630 } 1631 1632 data_err: 1633 (void) alarm(0); 1634 perror_reply(426, "Data Connection"); 1635 goto cleanup_recv_data; 1636 1637 file_err: 1638 (void) alarm(0); 1639 perror_reply(452, "Error writing file"); 1640 goto cleanup_recv_data; 1641 1642 cleanup_recv_data: 1643 (void) alarm(0); 1644 transflag = 0; 1645 total_files_in++; 1646 total_files++; 1647 total_xfers_in++; 1648 total_xfers++; 1649 return (rval); 1650 } 1651 1652 void 1653 statcmd(void) 1654 { 1655 union sockunion *su = NULL; 1656 static char ntop_buf[INET6_ADDRSTRLEN]; 1657 u_char *a, *p; 1658 int ispassive, af; 1659 off_t otbi, otbo, otb; 1660 1661 a = p = (u_char *)NULL; 1662 1663 reply(-211, "%s FTP server status:", hostname); 1664 reply(0, "Version: %s", FTPD_VERSION); 1665 ntop_buf[0] = '\0'; 1666 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1667 ntop_buf, sizeof(ntop_buf), NULL, 0, NI_NUMERICHOST) 1668 && strcmp(remotehost, ntop_buf) != 0) { 1669 reply(0, "Connected to %s (%s)", remotehost, ntop_buf); 1670 } else 1671 reply(0, "Connected to %s", remotehost); 1672 if (logged_in) { 1673 if (curclass.type == CLASS_GUEST) 1674 reply(0, "Logged in anonymously"); 1675 else 1676 reply(0, "Logged in as %s%s", pw->pw_name, 1677 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 1678 } else if (askpasswd) 1679 reply(0, "Waiting for password"); 1680 else 1681 reply(0, "Waiting for user name"); 1682 cprintf(stdout, " TYPE: %s", typenames[type]); 1683 if (type == TYPE_A || type == TYPE_E) 1684 cprintf(stdout, ", FORM: %s", formnames[form]); 1685 if (type == TYPE_L) { 1686 #if NBBY == 8 1687 cprintf(stdout, " %d", NBBY); 1688 #else 1689 /* XXX: `bytesize' needs to be defined in this case */ 1690 cprintf(stdout, " %d", bytesize); 1691 #endif 1692 } 1693 cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n", 1694 strunames[stru], modenames[mode]); 1695 ispassive = 0; 1696 if (data != -1) { 1697 reply(0, "Data connection open"); 1698 su = NULL; 1699 } else if (pdata != -1) { 1700 reply(0, "in Passive mode"); 1701 su = (union sockunion *)&pasv_addr; 1702 ispassive = 1; 1703 goto printaddr; 1704 } else if (usedefault == 0) { 1705 if (epsvall) { 1706 reply(0, "EPSV only mode (EPSV ALL)"); 1707 goto epsvonly; 1708 } 1709 su = (union sockunion *)&data_dest; 1710 printaddr: 1711 /* PASV/PORT */ 1712 if (su->su_family == AF_INET) { 1713 a = (u_char *) &su->su_sin.sin_addr; 1714 p = (u_char *) &su->su_sin.sin_port; 1715 #define UC(b) (((int) b) & 0xff) 1716 reply(0, "%s (%d,%d,%d,%d,%d,%d)", 1717 ispassive ? "PASV" : "PORT" , 1718 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1719 UC(p[0]), UC(p[1])); 1720 } 1721 1722 /* LPSV/LPRT */ 1723 { 1724 int alen, af, i; 1725 1726 alen = 0; 1727 switch (su->su_family) { 1728 case AF_INET: 1729 a = (u_char *) &su->su_sin.sin_addr; 1730 p = (u_char *) &su->su_sin.sin_port; 1731 alen = sizeof(su->su_sin.sin_addr); 1732 af = 4; 1733 break; 1734 case AF_INET6: 1735 a = (u_char *) &su->su_sin6.sin6_addr; 1736 p = (u_char *) &su->su_sin6.sin6_port; 1737 alen = sizeof(su->su_sin6.sin6_addr); 1738 af = 6; 1739 break; 1740 default: 1741 af = 0; 1742 break; 1743 } 1744 if (af) { 1745 cprintf(stdout, " %s (%d,%d", 1746 ispassive ? "LPSV" : "LPRT", af, alen); 1747 for (i = 0; i < alen; i++) 1748 cprintf(stdout, ",%d", UC(a[i])); 1749 cprintf(stdout, ",%d,%d,%d)", 2, UC(p[0]), UC(p[1])); 1750 #undef UC 1751 } 1752 } 1753 1754 /* EPRT/EPSV */ 1755 epsvonly: 1756 switch (su->su_family) { 1757 case AF_INET: 1758 af = 1; 1759 break; 1760 case AF_INET6: 1761 af = 2; 1762 break; 1763 default: 1764 af = 0; 1765 break; 1766 } 1767 if (af) { 1768 if (getnameinfo((struct sockaddr *)su, su->su_len, 1769 ntop_buf, sizeof(ntop_buf), NULL, 0, 1770 NI_NUMERICHOST) == 0) { 1771 reply(0, "%s (|%d|%s|%d|)", 1772 ispassive ? "EPSV" : "EPRT", 1773 af, ntop_buf, ntohs(su->su_port)); 1774 } 1775 } 1776 } else 1777 reply(0, "No data connection"); 1778 1779 if (logged_in) { 1780 reply(0, "Data sent: %qd byte%s in %qd file%s", 1781 (qdfmt_t)total_data_out, PLURAL(total_data_out), 1782 (qdfmt_t)total_files_out, PLURAL(total_files_out)); 1783 reply(0, "Data received: %qd byte%s in %qd file%s", 1784 (qdfmt_t)total_data_in, PLURAL(total_data_in), 1785 (qdfmt_t)total_files_in, PLURAL(total_files_in)); 1786 reply(0, "Total data: %qd byte%s in %qd file%s", 1787 (qdfmt_t)total_data, PLURAL(total_data), 1788 (qdfmt_t)total_files, PLURAL(total_files)); 1789 } 1790 otbi = total_bytes_in; 1791 otbo = total_bytes_out; 1792 otb = total_bytes; 1793 reply(0, "Traffic sent: %qd byte%s in %qd transfer%s", 1794 (qdfmt_t)otbo, PLURAL(otbo), 1795 (qdfmt_t)total_xfers_out, PLURAL(total_xfers_out)); 1796 reply(0, "Traffic received: %qd byte%s in %qd transfer%s", 1797 (qdfmt_t)otbi, PLURAL(otbi), 1798 (qdfmt_t)total_xfers_in, PLURAL(total_xfers_in)); 1799 reply(0, "Total traffic: %qd byte%s in %qd transfer%s", 1800 (qdfmt_t)otb, PLURAL(otb), 1801 (qdfmt_t)total_xfers, PLURAL(total_xfers)); 1802 1803 if (logged_in) { 1804 struct ftpconv *cp; 1805 1806 reply(0, ""); 1807 reply(0, "Class: %s, type: %s", 1808 curclass.classname, CURCLASSTYPE); 1809 reply(0, "Check PORT/LPRT commands: %sabled", 1810 curclass.checkportcmd ? "en" : "dis"); 1811 if (curclass.display != NULL) 1812 reply(0, "Display file: %s", curclass.display); 1813 if (curclass.notify != NULL) 1814 reply(0, "Notify fileglob: %s", curclass.notify); 1815 reply(0, "Idle timeout: %d, maximum timeout: %d", 1816 curclass.timeout, curclass.maxtimeout); 1817 reply(0, "Current connections: %d", connections); 1818 if (curclass.limit == -1) 1819 reply(0, "Maximum connections: unlimited"); 1820 else 1821 reply(0, "Maximum connections: %d", curclass.limit); 1822 if (curclass.limitfile) 1823 reply(0, "Connection limit exceeded file: %s", 1824 curclass.limitfile); 1825 if (curclass.motd != NULL) 1826 reply(0, "MotD file: %s", curclass.motd); 1827 reply(0, 1828 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 1829 curclass.modify ? "en" : "dis"); 1830 reply(0, "Upload commands (APPE, STOR, STOU): %sabled", 1831 curclass.upload ? "en" : "dis"); 1832 if (curclass.portmin && curclass.portmax) 1833 reply(0, "PASV port range: %d - %d", 1834 curclass.portmin, curclass.portmax); 1835 if (curclass.rateget) 1836 reply(0, "Rate get limit: %d bytes/sec", 1837 curclass.rateget); 1838 else 1839 reply(0, "Rate get limit: disabled"); 1840 if (curclass.rateput) 1841 reply(0, "Rate put limit: %d bytes/sec", 1842 curclass.rateput); 1843 else 1844 reply(0, "Rate put limit: disabled"); 1845 reply(0, "Umask: %.04o", curclass.umask); 1846 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1847 if (cp->suffix == NULL || cp->types == NULL || 1848 cp->command == NULL) 1849 continue; 1850 reply(0, "Conversion: %s [%s] disable: %s, command: %s", 1851 cp->suffix, cp->types, cp->disable, cp->command); 1852 } 1853 } 1854 1855 reply(211, "End of status"); 1856 } 1857 1858 void 1859 fatal(const char *s) 1860 { 1861 1862 reply(451, "Error in server: %s\n", s); 1863 reply(221, "Closing connection due to server error."); 1864 dologout(0); 1865 /* NOTREACHED */ 1866 } 1867 1868 /* 1869 * reply() -- 1870 * depending on the value of n, display fmt with a trailing CRLF and 1871 * prefix of: 1872 * n < -1 prefix the message with abs(n) + "-" (initial line) 1873 * n == 0 prefix the message with 4 spaces (middle lines) 1874 * n > 0 prefix the message with n + " " (final line) 1875 */ 1876 void 1877 reply(int n, const char *fmt, ...) 1878 { 1879 off_t b; 1880 va_list ap; 1881 1882 va_start(ap, fmt); 1883 b = 0; 1884 if (n == 0) 1885 cprintf(stdout, " "); 1886 else if (n < 0) 1887 cprintf(stdout, "%d-", -n); 1888 else 1889 cprintf(stdout, "%d ", n); 1890 b = vprintf(fmt, ap); 1891 total_bytes += b; 1892 total_bytes_out += b; 1893 cprintf(stdout, "\r\n"); 1894 (void)fflush(stdout); 1895 if (debug) { 1896 syslog(LOG_DEBUG, "<--- %d%c", abs(n), (n < 0) ? '-' : ' '); 1897 vsyslog(LOG_DEBUG, fmt, ap); 1898 } 1899 } 1900 1901 static void 1902 dolog(struct sockaddr *who) 1903 { 1904 getnameinfo(who, who->sa_len, remotehost, sizeof(remotehost), NULL,0,0); 1905 #ifdef HASSETPROCTITLE 1906 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1907 setproctitle(proctitle); 1908 #endif /* HASSETPROCTITLE */ 1909 if (logging) 1910 syslog(LOG_INFO, "connection from %s to %s", 1911 remotehost, hostname); 1912 } 1913 1914 /* 1915 * Record logout in wtmp file 1916 * and exit with supplied status. 1917 */ 1918 void 1919 dologout(int status) 1920 { 1921 /* 1922 * Prevent reception of SIGURG from resulting in a resumption 1923 * back to the main program loop. 1924 */ 1925 transflag = 0; 1926 1927 if (logged_in) { 1928 (void) seteuid((uid_t)0); 1929 logwtmp(ttyline, "", ""); 1930 if (doutmp) 1931 logout(utmp.ut_line); 1932 #ifdef KERBEROS 1933 if (!notickets && krbtkfile_env) 1934 unlink(krbtkfile_env); 1935 #endif 1936 } 1937 /* beware of flushing buffers after a SIGPIPE */ 1938 _exit(status); 1939 } 1940 1941 static void 1942 myoob(int signo) 1943 { 1944 char *cp; 1945 1946 /* only process if transfer occurring */ 1947 if (!transflag) 1948 return; 1949 cp = tmpline; 1950 if (getline(cp, 7, stdin) == NULL) { 1951 reply(221, "You could at least say goodbye."); 1952 dologout(0); 1953 } 1954 if (strcasecmp(cp, "ABOR\r\n") == 0) { 1955 tmpline[0] = '\0'; 1956 reply(426, "Transfer aborted. Data connection closed."); 1957 reply(226, "Abort successful"); 1958 longjmp(urgcatch, 1); 1959 } 1960 if (strcasecmp(cp, "STAT\r\n") == 0) { 1961 tmpline[0] = '\0'; 1962 if (file_size != (off_t) -1) 1963 reply(213, "Status: %qd of %qd byte%s transferred", 1964 (qdfmt_t)byte_count, (qdfmt_t)file_size, 1965 PLURAL(byte_count)); 1966 else 1967 reply(213, "Status: %qd byte%s transferred", 1968 (qdfmt_t)byte_count, PLURAL(byte_count)); 1969 } 1970 } 1971 1972 static int 1973 bind_pasv_addr(void) 1974 { 1975 static int passiveport; 1976 int port, len; 1977 1978 len = pasv_addr.su_len; 1979 if (curclass.portmin == 0 && curclass.portmax == 0) { 1980 pasv_addr.su_port = 0; 1981 return (bind(pdata, (struct sockaddr *)&pasv_addr, len)); 1982 } 1983 1984 if (passiveport == 0) { 1985 srand(getpid()); 1986 passiveport = rand() % (curclass.portmax - curclass.portmin) 1987 + curclass.portmin; 1988 } 1989 1990 port = passiveport; 1991 while (1) { 1992 port++; 1993 if (port > curclass.portmax) 1994 port = curclass.portmin; 1995 else if (port == passiveport) { 1996 errno = EAGAIN; 1997 return (-1); 1998 } 1999 pasv_addr.su_port = htons(port); 2000 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) == 0) 2001 break; 2002 if (errno != EADDRINUSE) 2003 return (-1); 2004 } 2005 passiveport = port; 2006 return (0); 2007 } 2008 2009 /* 2010 * Note: a response of 425 is not mentioned as a possible response to 2011 * the PASV command in RFC959. However, it has been blessed as 2012 * a legitimate response by Jon Postel in a telephone conversation 2013 * with Rick Adams on 25 Jan 89. 2014 */ 2015 void 2016 passive(void) 2017 { 2018 int len; 2019 char *p, *a; 2020 2021 if (pdata >= 0) 2022 close(pdata); 2023 pdata = socket(AF_INET, SOCK_STREAM, 0); 2024 if (pdata < 0 || !logged_in) { 2025 perror_reply(425, "Can't open passive connection"); 2026 return; 2027 } 2028 pasv_addr = ctrl_addr; 2029 2030 if (bind_pasv_addr() < 0) 2031 goto pasv_error; 2032 len = pasv_addr.su_len; 2033 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2034 goto pasv_error; 2035 if (listen(pdata, 1) < 0) 2036 goto pasv_error; 2037 a = (char *) &pasv_addr.su_sin.sin_addr; 2038 p = (char *) &pasv_addr.su_port; 2039 2040 #define UC(b) (((int) b) & 0xff) 2041 2042 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2043 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2044 return; 2045 2046 pasv_error: 2047 (void) close(pdata); 2048 pdata = -1; 2049 perror_reply(425, "Can't open passive connection"); 2050 return; 2051 } 2052 2053 /* 2054 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2055 * 229 Entering Extended Passive Mode (|||port|) 2056 */ 2057 void 2058 long_passive(char *cmd, int pf) 2059 { 2060 int len; 2061 char *p, *a; 2062 2063 if (!logged_in) { 2064 syslog(LOG_NOTICE, "long passive but not logged in"); 2065 reply(503, "Login with USER first."); 2066 return; 2067 } 2068 2069 if (pf != PF_UNSPEC) { 2070 if (ctrl_addr.su_family != pf) { 2071 switch (ctrl_addr.su_family) { 2072 case AF_INET: 2073 pf = 1; 2074 break; 2075 case AF_INET6: 2076 pf = 2; 2077 break; 2078 default: 2079 pf = 0; 2080 break; 2081 } 2082 /* 2083 * XXX 2084 * only EPRT/EPSV ready clients will understand this 2085 */ 2086 if (strcmp(cmd, "EPSV") == 0 && pf) { 2087 reply(522, "Network protocol mismatch, " 2088 "use (%d)", pf); 2089 } else 2090 reply(501, "Network protocol mismatch"); /*XXX*/ 2091 2092 return; 2093 } 2094 } 2095 2096 if (pdata >= 0) 2097 close(pdata); 2098 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2099 if (pdata < 0) { 2100 perror_reply(425, "Can't open passive connection"); 2101 return; 2102 } 2103 pasv_addr = ctrl_addr; 2104 if (bind_pasv_addr() < 0) 2105 goto pasv_error; 2106 len = pasv_addr.su_len; 2107 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2108 goto pasv_error; 2109 if (listen(pdata, 1) < 0) 2110 goto pasv_error; 2111 p = (char *) &pasv_addr.su_port; 2112 2113 #define UC(b) (((int) b) & 0xff) 2114 2115 if (strcmp(cmd, "LPSV") == 0) { 2116 switch (pasv_addr.su_family) { 2117 case AF_INET: 2118 a = (char *) &pasv_addr.su_sin.sin_addr; 2119 reply(228, "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2120 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2121 2, UC(p[0]), UC(p[1])); 2122 return; 2123 case AF_INET6: 2124 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2125 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)", 2126 6, 16, 2127 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2128 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2129 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2130 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2131 2, UC(p[0]), UC(p[1])); 2132 return; 2133 } 2134 #undef UC 2135 } else if (strcmp(cmd, "EPSV") == 0) { 2136 switch (pasv_addr.su_family) { 2137 case AF_INET: 2138 case AF_INET6: 2139 reply(229, "Entering Extended Passive Mode (|||%d|)", 2140 ntohs(pasv_addr.su_port)); 2141 return; 2142 } 2143 } else { 2144 /* more proper error code? */ 2145 } 2146 2147 pasv_error: 2148 (void) close(pdata); 2149 pdata = -1; 2150 perror_reply(425, "Can't open passive connection"); 2151 return; 2152 } 2153 2154 /* 2155 * Generate unique name for file with basename "local". 2156 * The file named "local" is already known to exist. 2157 * Generates failure reply on error. 2158 * 2159 * XXX this function should under go changes similar to 2160 * the mktemp(3)/mkstemp(3) changes. 2161 */ 2162 static char * 2163 gunique(const char *local) 2164 { 2165 static char new[MAXPATHLEN]; 2166 struct stat st; 2167 char *cp; 2168 int count; 2169 2170 cp = strrchr(local, '/'); 2171 if (cp) 2172 *cp = '\0'; 2173 if (stat(cp ? local : ".", &st) < 0) { 2174 perror_reply(553, cp ? local : "."); 2175 return (NULL); 2176 } 2177 if (cp) 2178 *cp = '/'; 2179 for (count = 1; count < 100; count++) { 2180 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2181 if (stat(new, &st) < 0) 2182 return (new); 2183 } 2184 reply(452, "Unique file name cannot be created."); 2185 return (NULL); 2186 } 2187 2188 /* 2189 * Format and send reply containing system error number. 2190 */ 2191 void 2192 perror_reply(int code, const char *string) 2193 { 2194 int save_errno; 2195 2196 save_errno = errno; 2197 reply(code, "%s: %s.", string, strerror(errno)); 2198 errno = save_errno; 2199 } 2200 2201 static char *onefile[] = { 2202 "", 2203 0 2204 }; 2205 2206 void 2207 send_file_list(const char *whichf) 2208 { 2209 struct stat st; 2210 DIR *dirp = NULL; 2211 struct dirent *dir; 2212 FILE *dout = NULL; 2213 char **dirlist, *dirname, *p; 2214 int simple = 0; 2215 int freeglob = 0; 2216 glob_t gl; 2217 off_t b; 2218 2219 #ifdef __GNUC__ 2220 (void) &dout; 2221 (void) &dirlist; 2222 (void) &simple; 2223 (void) &freeglob; 2224 #endif 2225 2226 p = NULL; 2227 if (strpbrk(whichf, "~{[*?") != NULL) { 2228 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2229 2230 memset(&gl, 0, sizeof(gl)); 2231 freeglob = 1; 2232 if (glob(whichf, flags, 0, &gl)) { 2233 reply(550, "not found"); 2234 goto out; 2235 } else if (gl.gl_pathc == 0) { 2236 errno = ENOENT; 2237 perror_reply(550, whichf); 2238 goto out; 2239 } 2240 dirlist = gl.gl_pathv; 2241 } else { 2242 p = xstrdup(whichf); 2243 onefile[0] = p; 2244 dirlist = onefile; 2245 simple = 1; 2246 } 2247 /* XXX: } for vi sm */ 2248 2249 if (setjmp(urgcatch)) { 2250 transflag = 0; 2251 goto out; 2252 } 2253 while ((dirname = *dirlist++) != NULL) { 2254 int trailingslash = 0; 2255 2256 if (stat(dirname, &st) < 0) { 2257 /* 2258 * If user typed "ls -l", etc, and the client 2259 * used NLST, do what the user meant. 2260 */ 2261 /* XXX: nuke this support? */ 2262 if (dirname[0] == '-' && *dirlist == NULL && 2263 transflag == 0) { 2264 char *argv[] = { INTERNAL_LS, "", NULL }; 2265 2266 argv[1] = dirname; 2267 retrieve(argv, dirname); 2268 goto out; 2269 } 2270 perror_reply(550, whichf); 2271 goto cleanup_send_file_list; 2272 } 2273 2274 if (S_ISREG(st.st_mode)) { 2275 if (dout == NULL) { 2276 dout = dataconn("file list", (off_t)-1, "w"); 2277 if (dout == NULL) 2278 goto out; 2279 transflag++; 2280 } 2281 b = fprintf(dout, "%s%s\n", dirname, 2282 type == TYPE_A ? "\r" : ""); 2283 total_bytes += b; 2284 total_bytes_out += b; 2285 byte_count += strlen(dirname) + 1; 2286 continue; 2287 } else if (!S_ISDIR(st.st_mode)) 2288 continue; 2289 2290 if (dirname[strlen(dirname) - 1] == '/') 2291 trailingslash++; 2292 2293 if ((dirp = opendir(dirname)) == NULL) 2294 continue; 2295 2296 while ((dir = readdir(dirp)) != NULL) { 2297 char nbuf[MAXPATHLEN]; 2298 2299 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 2300 continue; 2301 2302 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2303 trailingslash ? "" : "/", dir->d_name); 2304 2305 /* 2306 * We have to do a stat to ensure it's 2307 * not a directory or special file. 2308 */ 2309 /* XXX: follow RFC959 and filter out non files ? */ 2310 if (simple || (stat(nbuf, &st) == 0 && 2311 S_ISREG(st.st_mode))) { 2312 char *p; 2313 2314 if (dout == NULL) { 2315 dout = dataconn("file list", (off_t)-1, 2316 "w"); 2317 if (dout == NULL) 2318 goto out; 2319 transflag++; 2320 } 2321 p = nbuf; 2322 if (nbuf[0] == '.' && nbuf[1] == '/') 2323 p = &nbuf[2]; 2324 b = fprintf(dout, "%s%s\n", p, 2325 type == TYPE_A ? "\r" : ""); 2326 total_bytes += b; 2327 total_bytes_out += b; 2328 byte_count += strlen(nbuf) + 1; 2329 } 2330 } 2331 (void) closedir(dirp); 2332 } 2333 2334 if (dout == NULL) 2335 reply(550, "No files found."); 2336 else if (ferror(dout) != 0) 2337 perror_reply(550, "Data connection"); 2338 else 2339 reply(226, "Transfer complete."); 2340 2341 cleanup_send_file_list: 2342 transflag = 0; 2343 closedataconn(dout); 2344 out: 2345 total_xfers++; 2346 total_xfers_out++; 2347 if (p) 2348 free(p); 2349 if (freeglob) 2350 globfree(&gl); 2351 } 2352 2353 char * 2354 conffilename(const char *s) 2355 { 2356 static char filename[MAXPATHLEN]; 2357 2358 if (*s == '/') 2359 strlcpy(filename, s, sizeof(filename)); 2360 else 2361 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2362 return (filename); 2363 } 2364 2365 /* 2366 * logcmd -- 2367 * based on the arguments, syslog a message: 2368 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2369 * else if file2 != NULL "<command> <file1> <file2>" 2370 * else "<command> <file1>" 2371 * if elapsed != NULL, append "in xxx.yyy seconds" 2372 * if error != NULL, append ": " + error 2373 */ 2374 void 2375 logcmd(const char *command, off_t bytes, const char *file1, const char *file2, 2376 const struct timeval *elapsed, const char *error) 2377 { 2378 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN]; 2379 const char *p; 2380 size_t len; 2381 2382 if (logging <=1) 2383 return; 2384 2385 if ((p = realpath(file1, realfile)) == NULL) { 2386 #if 0 /* XXX: too noisy */ 2387 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2388 realfile, strerror(errno)); 2389 #endif 2390 p = file1; 2391 } 2392 len = snprintf(buf, sizeof(buf), "%s %s", command, p); 2393 2394 if (bytes != (off_t)-1) { 2395 len += snprintf(buf + len, sizeof(buf) - len, 2396 " = %qd byte%s", (qdfmt_t) bytes, PLURAL(bytes)); 2397 } else if (file2 != NULL) { 2398 if ((p = realpath(file2, realfile)) == NULL) { 2399 #if 0 /* XXX: too noisy */ 2400 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2401 realfile, strerror(errno)); 2402 #endif 2403 p = file2; 2404 } 2405 len += snprintf(buf + len, sizeof(buf) - len, " %s", p); 2406 } 2407 2408 if (elapsed != NULL) { 2409 len += snprintf(buf + len, sizeof(buf) - len, 2410 " in %ld.%.03d seconds", elapsed->tv_sec, 2411 (int)(elapsed->tv_usec / 1000)); 2412 } 2413 2414 if (error != NULL) 2415 len += snprintf(buf + len, sizeof(buf) - len, ": %s", error); 2416 2417 syslog(LOG_INFO, "%s", buf); 2418 } 2419 2420 char * 2421 xstrdup(const char *s) 2422 { 2423 char *new = strdup(s); 2424 2425 if (new == NULL) 2426 fatal("Local resource failure: malloc"); 2427 /* NOTREACHED */ 2428 return (new); 2429 } 2430 2431 /* 2432 * As per fprintf(), but increment total_bytes and total_bytes_out, 2433 * by the appropriate amount. 2434 */ 2435 void 2436 cprintf(FILE *fd, const char *fmt, ...) 2437 { 2438 off_t b; 2439 va_list ap; 2440 2441 va_start(ap, fmt); 2442 b = vfprintf(fd, fmt, ap); 2443 total_bytes += b; 2444 total_bytes_out += b; 2445 } 2446
Indexes created Tue Sep 23 23:09:58 GMT 2025