ftpd.c revision 1.109
1 /* $NetBSD: ftpd.c,v 1.109 2000/11/15 02:32:30 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 1.109 2000/11/15 02:32:30 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; /* update utmp file */ 176 int dowtmp; /* update wtmp file */ 177 int dropprivs; /* if privileges should or have been dropped */ 178 int mapped; /* IPv4 connection on AF_INET6 socket */ 179 off_t file_size; 180 off_t byte_count; 181 static char ttyline[20]; 182 static struct utmp utmp; /* for utmp */ 183 184 static char *anondir = NULL; 185 static char confdir[MAXPATHLEN]; 186 187 #if defined(KERBEROS) || defined(KERBEROS5) 188 int has_ccache = 0; 189 int notickets = 1; 190 char *krbtkfile_env = NULL; 191 char *tty = ttyline; 192 int login_krb5_forwardable_tgt = 0; 193 #endif 194 195 #ifndef INET6_ADDRSTRLEN 196 #define INET6_ADDRSTRLEN MAXHOSTNAMELEN 197 #endif 198 199 int epsvall = 0; 200 201 /* 202 * Timeout intervals for retrying connections 203 * to hosts that don't accept PORT cmds. This 204 * is a kludge, but given the problems with TCP... 205 */ 206 #define SWAITMAX 90 /* wait at most 90 seconds */ 207 #define SWAITINT 5 /* interval between retries */ 208 209 int swaitmax = SWAITMAX; 210 int swaitint = SWAITINT; 211 212 static int bind_pasv_addr(void); 213 static int checkuser(const char *, const char *, int, int, char **); 214 static int checkaccess(const char *); 215 static void dolog(struct sockaddr *); 216 static void end_login(void); 217 static FILE *getdatasock(const char *); 218 static char *gunique(const char *); 219 static void lostconn(int); 220 static void myoob(int); 221 static int receive_data(FILE *, FILE *); 222 static int send_data(FILE *, FILE *, off_t, int); 223 static struct passwd *sgetpwnam(const char *); 224 225 int main(int, char *[]); 226 227 #if defined(KERBEROS) 228 int klogin(struct passwd *, char *, char *, char *); 229 void kdestroy(void); 230 #endif 231 #if defined(KERBEROS5) 232 int k5login(struct passwd *, char *, char *, char *); 233 void k5destroy(void); 234 #endif 235 236 int 237 main(int argc, char *argv[]) 238 { 239 int addrlen, ch, on = 1, tos, keepalive; 240 #ifdef KERBEROS5 241 krb5_error_code kerror; 242 #endif 243 244 connections = 1; 245 debug = 0; 246 logging = 0; 247 pdata = -1; 248 sflag = 0; 249 doutmp = 0; /* default: don't log to utmp */ 250 dowtmp = 1; /* default: DO log to wtmp */ 251 dropprivs = 0; 252 mapped = 0; 253 usedefault = 1; 254 (void)strcpy(confdir, _DEFAULT_CONFDIR); 255 hostname[0] = '\0'; 256 homedir[0] = '\0'; 257 gidcount = 0; 258 259 version = FTPD_VERSION; 260 while ((ch = getopt(argc, argv, "a:c:C:dh:Hlrst:T:u:UvV:W")) != -1) { 261 switch (ch) { 262 case 'a': 263 anondir = optarg; 264 break; 265 266 case 'c': 267 (void)strlcpy(confdir, optarg, sizeof(confdir)); 268 break; 269 270 case 'C': 271 pw = sgetpwnam(optarg); 272 exit(checkaccess(optarg) ? 0 : 1); 273 /* NOTREACHED */ 274 275 case 'd': 276 case 'v': /* deprecated */ 277 debug = 1; 278 break; 279 280 case 'h': 281 strlcpy(hostname, optarg, sizeof(hostname)); 282 break; 283 284 case 'H': 285 if (gethostname(hostname, sizeof(hostname)) == -1) 286 hostname[0] = '\0'; 287 hostname[sizeof(hostname) - 1] = '\0'; 288 break; 289 290 case 'l': 291 logging++; /* > 1 == extra logging */ 292 break; 293 294 case 'r': 295 dropprivs = 1; 296 break; 297 298 case 's': 299 sflag = 1; 300 break; 301 302 case 't': 303 case 'T': 304 case 'u': 305 warnx("-%c has been deprecated in favour of ftpd.conf", 306 ch); 307 break; 308 309 case 'U': 310 doutmp = 1; 311 break; 312 313 case 'V': 314 if (EMPTYSTR(optarg) || strcmp(optarg, "-") == 0) 315 version = NULL; 316 else 317 version = xstrdup(optarg); 318 break; 319 320 case 'W': 321 dowtmp = 0; 322 break; 323 324 default: 325 if (optopt == 'a' || optopt == 'C') 326 exit(1); 327 warnx("unknown flag -%c ignored", optopt); 328 break; 329 } 330 } 331 332 /* 333 * LOG_NDELAY sets up the logging connection immediately, 334 * necessary for anonymous ftp's that chroot and can't do it later. 335 */ 336 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 337 memset((char *)&his_addr, 0, sizeof (his_addr)); 338 addrlen = sizeof(his_addr.si_su); 339 if (getpeername(0, (struct sockaddr *)&his_addr.si_su, &addrlen) < 0) { 340 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 341 exit(1); 342 } 343 his_addr.su_len = addrlen; 344 memset((char *)&ctrl_addr, 0, sizeof (ctrl_addr)); 345 addrlen = sizeof(ctrl_addr.si_su); 346 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 347 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 348 exit(1); 349 } 350 ctrl_addr.su_len = addrlen; 351 #ifdef INET6 352 if (his_addr.su_family == AF_INET6 353 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_6addr)) { 354 #if 1 355 /* 356 * IPv4 control connection arrived to AF_INET6 socket. 357 * I hate to do this, but this is the easiest solution. 358 * 359 * The assumption is untrue on SIIT environment. 360 */ 361 struct sockinet tmp_addr; 362 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 363 364 tmp_addr = his_addr; 365 memset(&his_addr, 0, sizeof(his_addr)); 366 his_addr.su_family = AF_INET; 367 his_addr.su_len = sizeof(his_addr.si_su.su_sin); 368 memcpy(&his_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 369 sizeof(his_addr.su_addr)); 370 his_addr.su_port = tmp_addr.su_port; 371 372 tmp_addr = ctrl_addr; 373 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 374 ctrl_addr.su_family = AF_INET; 375 ctrl_addr.su_len = sizeof(ctrl_addr.si_su.su_sin); 376 memcpy(&ctrl_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 377 sizeof(ctrl_addr.su_addr)); 378 ctrl_addr.su_port = tmp_addr.su_port; 379 #else 380 while (fgets(line, sizeof(line), fd) != NULL) { 381 if ((cp = strchr(line, '\n')) != NULL) 382 *cp = '\0'; 383 reply(-530, "%s", line); 384 } 385 (void) fflush(stdout); 386 (void) fclose(fd); 387 reply(530, 388 "Connection from IPv4 mapped address is not supported."); 389 exit(0); 390 #endif 391 392 mapped = 1; 393 } else 394 #endif /* INET6 */ 395 mapped = 0; 396 #ifdef IP_TOS 397 if (!mapped && his_addr.su_family == AF_INET) { 398 tos = IPTOS_LOWDELAY; 399 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 400 sizeof(int)) < 0) 401 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 402 } 403 #endif 404 /* if the hostname hasn't been given, attempt to determine it */ 405 if (hostname[0] == '\0') { 406 if (getnameinfo((struct sockaddr *)&ctrl_addr.si_su, 407 ctrl_addr.su_len, hostname, sizeof(hostname), NULL, 0, 0) 408 != 0) 409 (void)gethostname(hostname, sizeof(hostname)); 410 hostname[sizeof(hostname) - 1] = '\0'; 411 } 412 413 /* set this here so klogin can use it... */ 414 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 415 416 (void) freopen(_PATH_DEVNULL, "w", stderr); 417 (void) signal(SIGPIPE, lostconn); 418 (void) signal(SIGCHLD, SIG_IGN); 419 if (signal(SIGURG, myoob) == SIG_ERR) 420 syslog(LOG_ERR, "signal: %m"); 421 422 /* Try to handle urgent data inline */ 423 #ifdef SO_OOBINLINE 424 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 425 syslog(LOG_ERR, "setsockopt: %m"); 426 #endif 427 /* Set keepalives on the socket to detect dropped connections. */ 428 #ifdef SO_KEEPALIVE 429 keepalive = 1; 430 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 431 sizeof(int)) < 0) 432 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 433 #endif 434 435 #ifdef F_SETOWN 436 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 437 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 438 #endif 439 dolog((struct sockaddr *)&his_addr); 440 /* 441 * Set up default state 442 */ 443 data = -1; 444 type = TYPE_A; 445 form = FORM_N; 446 stru = STRU_F; 447 mode = MODE_S; 448 tmpline[0] = '\0'; 449 hasyyerrored = 0; 450 451 #ifdef KERBEROS5 452 kerror = krb5_init_context(&kcontext); 453 if (kerror) { 454 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 455 error_message(kerror)); 456 exit(0); 457 } 458 #endif /* KERBEROS5 */ 459 460 init_curclass(); 461 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 462 curclass.type = CLASS_REAL; 463 464 /* If logins are disabled, print out the message. */ 465 if (display_file(_PATH_NOLOGIN, 530)) { 466 reply(530, "System not available."); 467 exit(0); 468 } 469 (void)display_file(conffilename(_PATH_FTPWELCOME), 220); 470 /* reply(220,) must follow */ 471 if (EMPTYSTR(version)) 472 reply(220, "%s FTP server ready.", hostname); 473 else 474 reply(220, "%s FTP server (%s) ready.", hostname, version); 475 476 (void) setjmp(errcatch); 477 for (;;) 478 (void) yyparse(); 479 /* NOTREACHED */ 480 } 481 482 static void 483 lostconn(int signo) 484 { 485 486 if (debug) 487 syslog(LOG_DEBUG, "lost connection"); 488 dologout(1); 489 } 490 491 /* 492 * Save the result of a getpwnam. Used for USER command, since 493 * the data returned must not be clobbered by any other command 494 * (e.g., globbing). 495 */ 496 static struct passwd * 497 sgetpwnam(const char *name) 498 { 499 static struct passwd save; 500 struct passwd *p; 501 502 if ((p = getpwnam(name)) == NULL) 503 return (p); 504 if (save.pw_name) { 505 free((char *)save.pw_name); 506 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 507 free((char *)save.pw_passwd); 508 free((char *)save.pw_gecos); 509 free((char *)save.pw_dir); 510 free((char *)save.pw_shell); 511 } 512 save = *p; 513 save.pw_name = xstrdup(p->pw_name); 514 save.pw_passwd = xstrdup(p->pw_passwd); 515 save.pw_gecos = xstrdup(p->pw_gecos); 516 save.pw_dir = xstrdup(p->pw_dir); 517 save.pw_shell = xstrdup(p->pw_shell); 518 return (&save); 519 } 520 521 static int login_attempts; /* number of failed login attempts */ 522 static int askpasswd; /* had user command, ask for passwd */ 523 static char curname[10]; /* current USER name */ 524 525 /* 526 * USER command. 527 * Sets global passwd pointer pw if named account exists and is acceptable; 528 * sets askpasswd if a PASS command is expected. If logged in previously, 529 * need to reset state. If name is "ftp" or "anonymous", the name is not in 530 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 531 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 532 * requesting login privileges. Disallow anyone who does not have a standard 533 * shell as returned by getusershell(). Disallow anyone mentioned in the file 534 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 535 */ 536 void 537 user(const char *name) 538 { 539 if (logged_in) { 540 switch (curclass.type) { 541 case CLASS_GUEST: 542 reply(530, "Can't change user from guest login."); 543 return; 544 case CLASS_CHROOT: 545 reply(530, "Can't change user from chroot user."); 546 return; 547 case CLASS_REAL: 548 if (dropprivs) { 549 reply(530, "Can't change user."); 550 return; 551 } 552 end_login(); 553 break; 554 default: 555 abort(); 556 } 557 } 558 559 #if defined(KERBEROS) 560 kdestroy(); 561 #endif 562 #if defined(KERBEROS5) 563 k5destroy(); 564 #endif 565 566 curclass.type = CLASS_REAL; 567 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 568 /* need `pw' setup for checkaccess() and checkuser () */ 569 if ((pw = sgetpwnam("ftp")) == NULL) 570 reply(530, "User %s unknown.", name); 571 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 572 reply(530, "User %s access denied.", name); 573 else { 574 curclass.type = CLASS_GUEST; 575 askpasswd = 1; 576 reply(331, 577 "Guest login ok, type your name as password."); 578 } 579 if (!askpasswd && logging) 580 syslog(LOG_NOTICE, 581 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 582 return; 583 } 584 585 pw = sgetpwnam(name); 586 if (logging) 587 strlcpy(curname, name, sizeof(curname)); 588 589 #ifdef SKEY 590 if (skey_haskey(name) == 0) { 591 const char *myskey; 592 593 myskey = skey_keyinfo(name); 594 reply(331, "Password [%s] required for %s.", 595 myskey ? myskey : "error getting challenge", name); 596 } else 597 #endif 598 reply(331, "Password required for %s.", name); 599 600 askpasswd = 1; 601 /* 602 * Delay before reading passwd after first failed 603 * attempt to slow down passwd-guessing programs. 604 */ 605 if (login_attempts) 606 sleep((unsigned) login_attempts); 607 } 608 609 /* 610 * Determine whether something is to happen (allow access, chroot) 611 * for a user. Each line is a shell-style glob followed by 612 * `yes' or `no'. 613 * 614 * For backward compatability, `allow' and `deny' are synonymns 615 * for `yes' and `no', respectively. 616 * 617 * Each glob is matched against the username in turn, and the first 618 * match found is used. If no match is found, the result is the 619 * argument `def'. If a match is found but without and explicit 620 * `yes'/`no', the result is the opposite of def. 621 * 622 * If the file doesn't exist at all, the result is the argument 623 * `nofile' 624 * 625 * Any line starting with `#' is considered a comment and ignored. 626 * 627 * Returns 0 if the user is denied, or 1 if they are allowed. 628 * 629 * NOTE: needs struct passwd *pw setup before use. 630 */ 631 int 632 checkuser(const char *fname, const char *name, int def, int nofile, 633 char **retclass) 634 { 635 FILE *fd; 636 int retval; 637 char *glob, *perm, *class, *buf, *p; 638 size_t len, line; 639 640 retval = def; 641 if (retclass != NULL) 642 *retclass = NULL; 643 if ((fd = fopen(conffilename(fname), "r")) == NULL) 644 return nofile; 645 646 line = 0; 647 for (; 648 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 649 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 650 free(buf), buf = NULL) { 651 glob = perm = class = NULL; 652 p = buf; 653 if (len < 1) 654 continue; 655 if (p[len - 1] == '\n') 656 p[--len] = '\0'; 657 if (EMPTYSTR(p)) 658 continue; 659 660 NEXTWORD(p, glob); 661 NEXTWORD(p, perm); 662 NEXTWORD(p, class); 663 if (EMPTYSTR(glob)) 664 continue; 665 if (!EMPTYSTR(class)) { 666 if (strcasecmp(class, "all") == 0 || 667 strcasecmp(class, "none") == 0) { 668 syslog(LOG_WARNING, 669 "%s line %d: illegal user-defined class `%s' - skipping entry", 670 fname, (int)line, class); 671 continue; 672 } 673 } 674 675 /* have a host specifier */ 676 if ((p = strchr(glob, '@')) != NULL) { 677 unsigned long net, mask, addr; 678 int bits; 679 680 *p++ = '\0'; 681 /* check against network or CIDR */ 682 if (isdigit(*p) && 683 (bits = inet_net_pton(AF_INET, p, 684 &net, sizeof(net))) != -1) { 685 net = ntohl(net); 686 mask = 0xffffffffU << (32 - bits); 687 addr = ntohl(his_addr.su_addr.s_addr); 688 if ((addr & mask) != net) 689 continue; 690 691 /* check against hostname glob */ 692 } else if (fnmatch(p, remotehost, 0) != 0) 693 continue; 694 } 695 696 /* have a group specifier */ 697 if ((p = strchr(glob, ':')) != NULL) { 698 gid_t *groups, *ng; 699 int gsize, i, found; 700 701 *p++ = '\0'; 702 groups = NULL; 703 gsize = 16; 704 do { 705 ng = realloc(groups, gsize * sizeof(gid_t)); 706 if (ng == NULL) 707 fatal( 708 "Local resource failure: realloc"); 709 groups = ng; 710 } while (getgrouplist(pw->pw_name, pw->pw_gid, 711 groups, &gsize) == -1); 712 found = 0; 713 for (i = 0; i < gsize; i++) { 714 struct group *g; 715 716 if ((g = getgrgid(groups[i])) == NULL) 717 continue; 718 if (fnmatch(p, g->gr_name, 0) == 0) { 719 found = 1; 720 break; 721 } 722 } 723 free(groups); 724 if (!found) 725 continue; 726 } 727 728 /* check against username glob */ 729 if (fnmatch(glob, name, 0) != 0) 730 continue; 731 732 if (perm != NULL && 733 ((strcasecmp(perm, "allow") == 0) || 734 (strcasecmp(perm, "yes") == 0))) 735 retval = 1; 736 else if (perm != NULL && 737 ((strcasecmp(perm, "deny") == 0) || 738 (strcasecmp(perm, "no") == 0))) 739 retval = 0; 740 else 741 retval = !def; 742 if (!EMPTYSTR(class) && retclass != NULL) 743 *retclass = xstrdup(class); 744 free(buf); 745 break; 746 } 747 (void) fclose(fd); 748 return (retval); 749 } 750 751 /* 752 * Check if user is allowed by /etc/ftpusers 753 * returns 1 for yes, 0 for no 754 * 755 * NOTE: needs struct passwd *pw setup (for checkuser()) 756 */ 757 int 758 checkaccess(const char *name) 759 { 760 761 return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL)); 762 } 763 764 /* 765 * Terminate login as previous user, if any, resetting state; 766 * used when USER command is given or login fails. 767 */ 768 static void 769 end_login(void) 770 { 771 772 if (logged_in) { 773 if (dowtmp) 774 logwtmp(ttyline, "", ""); 775 if (doutmp) 776 logout(utmp.ut_line); 777 } 778 /* reset login state */ 779 (void) seteuid((uid_t)0); 780 pw = NULL; 781 logged_in = 0; 782 quietmessages = 0; 783 gidcount = 0; 784 curclass.type = CLASS_REAL; 785 } 786 787 void 788 pass(const char *passwd) 789 { 790 int rval; 791 const char *cp, *shell; 792 char *class, root[MAXPATHLEN]; 793 794 class = NULL; 795 if (logged_in || askpasswd == 0) { 796 reply(503, "Login with USER first."); 797 return; 798 } 799 askpasswd = 0; 800 if (curclass.type != CLASS_GUEST) { 801 /* "ftp" is the only account allowed with no password */ 802 if (pw == NULL) { 803 rval = 1; /* failure below */ 804 goto skip; 805 } 806 #if defined(KERBEROS) 807 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 808 rval = 0; 809 goto skip; 810 } 811 #endif 812 #if defined(KERBEROS5) 813 if (k5login(pw, "", hostname, (char *)passwd) == 0) { 814 rval = 0; 815 goto skip; 816 } 817 #endif 818 #ifdef SKEY 819 if (skey_haskey(pw->pw_name) == 0) { 820 char *p; 821 int r; 822 823 p = xstrdup(passwd); 824 r = skey_passcheck(pw->pw_name, p); 825 free(p); 826 if (r != -1) { 827 rval = 0; 828 goto skip; 829 } 830 } 831 #endif 832 if (!sflag && *pw->pw_passwd != '\0' && 833 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 834 rval = 0; 835 goto skip; 836 } 837 rval = 1; 838 839 skip: 840 if (pw != NULL && pw->pw_expire && time(NULL) >= pw->pw_expire) 841 rval = 2; 842 843 /* 844 * If rval > 0, the user failed the authentication check 845 * above. If rval == 0, either Kerberos or local 846 * authentication succeeded. 847 */ 848 if (rval) { 849 reply(530, "%s", rval == 2 ? "Password expired." : 850 "Login incorrect."); 851 if (logging) { 852 syslog(LOG_NOTICE, 853 "FTP LOGIN FAILED FROM %s", remotehost); 854 syslog(LOG_AUTHPRIV | LOG_NOTICE, 855 "FTP LOGIN FAILED FROM %s, %s", 856 remotehost, curname); 857 } 858 pw = NULL; 859 if (login_attempts++ >= 5) { 860 syslog(LOG_NOTICE, 861 "repeated login failures from %s", 862 remotehost); 863 exit(0); 864 } 865 return; 866 } 867 } 868 869 /* password ok; see if anything else prevents login */ 870 if (! checkuser(_PATH_FTPUSERS, pw->pw_name, 1, 0, &class)) { 871 reply(530, "User %s may not use FTP.", pw->pw_name); 872 if (logging) 873 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 874 remotehost, pw->pw_name); 875 goto bad; 876 } 877 /* if not guest user, check for valid shell */ 878 if ((shell = pw->pw_shell) == NULL || *shell == 0) 879 shell = _PATH_BSHELL; 880 while ((cp = getusershell()) != NULL) 881 if (strcmp(cp, shell) == 0) 882 break; 883 endusershell(); 884 if (cp == NULL && curclass.type != CLASS_GUEST) { 885 reply(530, "User %s may not use FTP.", pw->pw_name); 886 if (logging) 887 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 888 remotehost, pw->pw_name); 889 goto bad; 890 } 891 892 login_attempts = 0; /* this time successful */ 893 if (setegid((gid_t)pw->pw_gid) < 0) { 894 reply(550, "Can't set gid."); 895 goto bad; 896 } 897 (void) initgroups(pw->pw_name, pw->pw_gid); 898 /* cache groups for cmds.c::matchgroup() */ 899 gidcount = getgroups(sizeof(gidlist), gidlist); 900 901 /* open wtmp before chroot */ 902 if (dowtmp) 903 logwtmp(ttyline, pw->pw_name, remotehost); 904 905 /* open utmp before chroot */ 906 if (doutmp) { 907 memset((void *)&utmp, 0, sizeof(utmp)); 908 (void)time(&utmp.ut_time); 909 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 910 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 911 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 912 login(&utmp); 913 } 914 915 logged_in = 1; 916 917 /* check user in /etc/ftpchroot */ 918 if (checkuser(_PATH_FTPCHROOT, pw->pw_name, 0, 0, NULL)) { 919 if (curclass.type == CLASS_GUEST) { 920 syslog(LOG_NOTICE, 921 "Can't change guest user to chroot class; remove entry in %s", 922 _PATH_FTPCHROOT); 923 exit(1); 924 } 925 curclass.type = CLASS_CHROOT; 926 } 927 if (class == NULL) { 928 switch (curclass.type) { 929 case CLASS_GUEST: 930 class = xstrdup("guest"); 931 break; 932 case CLASS_CHROOT: 933 class = xstrdup("chroot"); 934 break; 935 case CLASS_REAL: 936 class = xstrdup("real"); 937 break; 938 default: 939 abort(); 940 } 941 } 942 943 /* parse ftpd.conf, setting up various parameters */ 944 parse_conf(class); 945 count_users(); 946 if (curclass.limit != -1 && connections > curclass.limit) { 947 if (! EMPTYSTR(curclass.limitfile)) 948 (void)display_file(conffilename(curclass.limitfile), 949 530); 950 reply(530, 951 "User %s access denied, connection limit of %d reached.", 952 pw->pw_name, curclass.limit); 953 syslog(LOG_NOTICE, 954 "Maximum connection limit of %d for class %s reached, login refused for %s", 955 curclass.limit, curclass.classname, pw->pw_name); 956 goto bad; 957 } 958 959 homedir[0] = '/'; 960 switch (curclass.type) { 961 case CLASS_GUEST: 962 /* 963 * We MUST do a chdir() after the chroot. Otherwise 964 * the old current directory will be accessible as "." 965 * outside the new root! 966 */ 967 format_path(root, 968 curclass.chroot ? curclass.chroot : 969 anondir ? anondir : 970 pw->pw_dir); 971 format_path(homedir, 972 curclass.homedir ? curclass.homedir : 973 "/"); 974 if (EMPTYSTR(homedir)) 975 homedir[0] = '/'; 976 if (EMPTYSTR(root) || chroot(root) < 0) { 977 syslog(LOG_NOTICE, 978 "GUEST user %s: can't chroot to %s: %m", 979 pw->pw_name, root); 980 goto bad_guest; 981 } 982 if (chdir(homedir) < 0) { 983 syslog(LOG_NOTICE, 984 "GUEST user %s: can't chdir to %s: %m", 985 pw->pw_name, homedir); 986 bad_guest: 987 reply(550, "Can't set guest privileges."); 988 goto bad; 989 } 990 break; 991 case CLASS_CHROOT: 992 format_path(root, 993 curclass.chroot ? curclass.chroot : 994 pw->pw_dir); 995 format_path(homedir, 996 curclass.homedir ? curclass.homedir : 997 "/"); 998 if (EMPTYSTR(homedir)) 999 homedir[0] = '/'; 1000 if (EMPTYSTR(root) || chroot(root) < 0) { 1001 syslog(LOG_NOTICE, 1002 "CHROOT user %s: can't chroot to %s: %m", 1003 pw->pw_name, root); 1004 goto bad_chroot; 1005 } 1006 if (chdir(homedir) < 0) { 1007 syslog(LOG_NOTICE, 1008 "CHROOT user %s: can't chdir to %s: %m", 1009 pw->pw_name, homedir); 1010 bad_chroot: 1011 reply(550, "Can't change root."); 1012 goto bad; 1013 } 1014 break; 1015 case CLASS_REAL: 1016 format_path(homedir, 1017 curclass.homedir ? curclass.homedir : 1018 pw->pw_dir); 1019 if (EMPTYSTR(homedir) || chdir(homedir) < 0) { 1020 if (chdir("/") < 0) { 1021 syslog(LOG_NOTICE, 1022 "REAL user %s: can't chdir to %s: %m", 1023 pw->pw_name, 1024 !EMPTYSTR(homedir) ? homedir : "/"); 1025 reply(530, 1026 "User %s: can't change directory to %s.", 1027 pw->pw_name, 1028 !EMPTYSTR(homedir) ? homedir : "/"); 1029 goto bad; 1030 } else { 1031 reply(-230, 1032 "No directory! Logging in with home=/"); 1033 homedir[0] = '/'; 1034 } 1035 } 1036 break; 1037 } 1038 setlogin(pw->pw_name); 1039 if (dropprivs || 1040 (curclass.type != CLASS_REAL && 1041 ntohs(ctrl_addr.su_port) > IPPORT_RESERVED + 1)) { 1042 dropprivs++; 1043 if (setgid((gid_t)pw->pw_gid) < 0) { 1044 reply(550, "Can't set gid."); 1045 goto bad; 1046 } 1047 if (setuid((uid_t)pw->pw_uid) < 0) { 1048 reply(550, "Can't set uid."); 1049 goto bad; 1050 } 1051 } else { 1052 if (seteuid((uid_t)pw->pw_uid) < 0) { 1053 reply(550, "Can't set uid."); 1054 goto bad; 1055 } 1056 } 1057 setenv("HOME", homedir, 1); 1058 1059 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 1060 quietmessages = 1; 1061 1062 /* 1063 * Display a login message, if it exists. 1064 * N.B. reply(230,) must follow the message. 1065 */ 1066 (void)display_file(conffilename(curclass.motd), 230); 1067 show_chdir_messages(230); 1068 if (curclass.type == CLASS_GUEST) { 1069 reply(230, "Guest login ok, access restrictions apply."); 1070 #ifdef HASSETPROCTITLE 1071 snprintf(proctitle, sizeof(proctitle), 1072 "%s: anonymous/%.*s", remotehost, 1073 (int) (sizeof(proctitle) - sizeof(remotehost) - 1074 sizeof(": anonymous/")), passwd); 1075 setproctitle("%s", proctitle); 1076 #endif /* HASSETPROCTITLE */ 1077 if (logging) 1078 syslog(LOG_INFO, 1079 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 1080 remotehost, passwd, 1081 curclass.classname, CURCLASSTYPE); 1082 } else { 1083 reply(230, "User %s logged in.", pw->pw_name); 1084 #ifdef HASSETPROCTITLE 1085 snprintf(proctitle, sizeof(proctitle), 1086 "%s: %s", remotehost, pw->pw_name); 1087 setproctitle("%s", proctitle); 1088 #endif /* HASSETPROCTITLE */ 1089 if (logging) 1090 syslog(LOG_INFO, 1091 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1092 remotehost, pw->pw_name, 1093 curclass.classname, CURCLASSTYPE); 1094 } 1095 (void) umask(curclass.umask); 1096 goto cleanuppass; 1097 bad: 1098 /* Forget all about it... */ 1099 end_login(); 1100 cleanuppass: 1101 if (class) 1102 free(class); 1103 } 1104 1105 void 1106 retrieve(char *argv[], const char *name) 1107 { 1108 FILE *fin, *dout; 1109 struct stat st; 1110 int (*closefunc)(FILE *) = NULL; 1111 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1112 struct timeval start, finish, td, *tdp; 1113 const char *dispname; 1114 1115 sendrv = closerv = stderrfd = -1; 1116 isconversion = isdata = isls = log = 0; 1117 tdp = NULL; 1118 dispname = name; 1119 fin = dout = NULL; 1120 if (argv == NULL) { 1121 log = 1; 1122 isdata = 1; 1123 fin = fopen(name, "r"); 1124 closefunc = fclose; 1125 if (fin == NULL) 1126 argv = do_conversion(name); 1127 if (argv != NULL) { 1128 isconversion++; 1129 syslog(LOG_INFO, "get command: '%s' on '%s'", 1130 argv[0], name); 1131 } 1132 } 1133 if (argv != NULL) { 1134 char temp[MAXPATHLEN]; 1135 1136 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1137 isls = 1; 1138 stderrfd = -1; 1139 } else { 1140 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1141 stderrfd = mkstemp(temp); 1142 if (stderrfd != -1) 1143 (void)unlink(temp); 1144 } 1145 dispname = argv[0]; 1146 fin = ftpd_popen(argv, "r", stderrfd); 1147 closefunc = ftpd_pclose; 1148 st.st_size = -1; 1149 st.st_blksize = BUFSIZ; 1150 } 1151 if (fin == NULL) { 1152 if (errno != 0) { 1153 perror_reply(550, dispname); 1154 if (log) 1155 logcmd("get", -1, name, NULL, NULL, 1156 strerror(errno)); 1157 } 1158 goto cleanupretrieve; 1159 } 1160 byte_count = -1; 1161 if (argv == NULL 1162 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1163 reply(550, "%s: not a plain file.", dispname); 1164 goto done; 1165 } 1166 if (restart_point) { 1167 if (type == TYPE_A) { 1168 off_t i; 1169 int c; 1170 1171 for (i = 0; i < restart_point; i++) { 1172 if ((c=getc(fin)) == EOF) { 1173 perror_reply(550, dispname); 1174 goto done; 1175 } 1176 if (c == '\n') 1177 i++; 1178 } 1179 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1180 perror_reply(550, dispname); 1181 goto done; 1182 } 1183 } 1184 dout = dataconn(dispname, st.st_size, "w"); 1185 if (dout == NULL) 1186 goto done; 1187 1188 (void)gettimeofday(&start, NULL); 1189 sendrv = send_data(fin, dout, st.st_blksize, isdata); 1190 (void)gettimeofday(&finish, NULL); 1191 (void) fclose(dout); /* close now to affect timing stats */ 1192 dout = NULL; 1193 timersub(&finish, &start, &td); 1194 tdp = &td; 1195 done: 1196 if (log) 1197 logcmd("get", byte_count, name, NULL, tdp, NULL); 1198 closerv = (*closefunc)(fin); 1199 if (sendrv == 0) { 1200 FILE *err; 1201 struct stat sb; 1202 1203 if (!isls && argv != NULL && closerv != 0) { 1204 reply(-226, 1205 "Command returned an exit status of %d", 1206 closerv); 1207 if (isconversion) 1208 syslog(LOG_INFO, 1209 "retrieve command: '%s' returned %d", 1210 argv[0], closerv); 1211 } 1212 if (!isls && argv != NULL && stderrfd != -1 && 1213 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1214 ((err = fdopen(stderrfd, "r")) != NULL)) { 1215 char *cp, line[LINE_MAX]; 1216 1217 reply(-226, "Command error messages:"); 1218 rewind(err); 1219 while (fgets(line, sizeof(line), err) != NULL) { 1220 if ((cp = strchr(line, '\n')) != NULL) 1221 *cp = '\0'; 1222 reply(0, " %s", line); 1223 } 1224 (void) fflush(stdout); 1225 (void) fclose(err); 1226 /* a reply(226,) must follow */ 1227 } 1228 reply(226, "Transfer complete."); 1229 } 1230 cleanupretrieve: 1231 closedataconn(dout); 1232 if (stderrfd != -1) 1233 (void)close(stderrfd); 1234 if (isconversion) 1235 free(argv); 1236 } 1237 1238 void 1239 store(const char *name, const char *mode, int unique) 1240 { 1241 FILE *fout, *din; 1242 struct stat st; 1243 int (*closefunc)(FILE *); 1244 struct timeval start, finish, td, *tdp; 1245 char *desc; 1246 1247 din = NULL; 1248 desc = (*mode == 'w') ? "put" : "append"; 1249 if (unique && stat(name, &st) == 0 && 1250 (name = gunique(name)) == NULL) { 1251 logcmd(desc, -1, name, NULL, NULL, "cannot create unique file"); 1252 goto cleanupstore; 1253 } 1254 1255 if (restart_point) 1256 mode = "r+"; 1257 fout = fopen(name, mode); 1258 closefunc = fclose; 1259 tdp = NULL; 1260 if (fout == NULL) { 1261 perror_reply(553, name); 1262 logcmd(desc, -1, name, NULL, NULL, strerror(errno)); 1263 goto cleanupstore; 1264 } 1265 byte_count = -1; 1266 if (restart_point) { 1267 if (type == TYPE_A) { 1268 off_t i; 1269 int c; 1270 1271 for (i = 0; i < restart_point; i++) { 1272 if ((c=getc(fout)) == EOF) { 1273 perror_reply(550, name); 1274 goto done; 1275 } 1276 if (c == '\n') 1277 i++; 1278 } 1279 /* 1280 * We must do this seek to "current" position 1281 * because we are changing from reading to 1282 * writing. 1283 */ 1284 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1285 perror_reply(550, name); 1286 goto done; 1287 } 1288 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1289 perror_reply(550, name); 1290 goto done; 1291 } 1292 } 1293 din = dataconn(name, (off_t)-1, "r"); 1294 if (din == NULL) 1295 goto done; 1296 (void)gettimeofday(&start, NULL); 1297 if (receive_data(din, fout) == 0) { 1298 if (unique) 1299 reply(226, "Transfer complete (unique file name:%s).", 1300 name); 1301 else 1302 reply(226, "Transfer complete."); 1303 } 1304 (void)gettimeofday(&finish, NULL); 1305 (void) fclose(din); /* close now to affect timing stats */ 1306 din = NULL; 1307 timersub(&finish, &start, &td); 1308 tdp = &td; 1309 done: 1310 logcmd(desc, byte_count, name, NULL, tdp, NULL); 1311 (*closefunc)(fout); 1312 cleanupstore: 1313 closedataconn(din); 1314 } 1315 1316 static FILE * 1317 getdatasock(const char *mode) 1318 { 1319 int on, s, t, tries; 1320 in_port_t port; 1321 1322 on = 1; 1323 if (data >= 0) 1324 return (fdopen(data, mode)); 1325 if (! dropprivs) 1326 (void) seteuid((uid_t)0); 1327 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1328 if (s < 0) 1329 goto bad; 1330 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1331 (char *) &on, sizeof(on)) < 0) 1332 goto bad; 1333 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1334 (char *) &on, sizeof(on)) < 0) 1335 goto bad; 1336 /* anchor socket to avoid multi-homing problems */ 1337 data_source = ctrl_addr; 1338 /* 1339 * By default source port for PORT connctions is 1340 * ctrlport-1 (see RFC959 section 5.2). 1341 * However, if privs have been dropped and that 1342 * would be < IPPORT_RESERVED, use a random port 1343 * instead. 1344 */ 1345 port = ntohs(ctrl_addr.su_port) - 1; 1346 if (dropprivs && port < IPPORT_RESERVED) 1347 port = 0; /* use random port */ 1348 data_source.su_port = htons(port); 1349 1350 for (tries = 1; ; tries++) { 1351 if (bind(s, (struct sockaddr *)&data_source.si_su, 1352 data_source.su_len) >= 0) 1353 break; 1354 if (errno != EADDRINUSE || tries > 10) 1355 goto bad; 1356 sleep(tries); 1357 } 1358 if (! dropprivs) 1359 (void) seteuid((uid_t)pw->pw_uid); 1360 #ifdef IP_TOS 1361 if (!mapped && ctrl_addr.su_family == AF_INET) { 1362 on = IPTOS_THROUGHPUT; 1363 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1364 sizeof(int)) < 0) 1365 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1366 } 1367 #endif 1368 return (fdopen(s, mode)); 1369 bad: 1370 /* Return the real value of errno (close may change it) */ 1371 t = errno; 1372 if (! dropprivs) 1373 (void) seteuid((uid_t)pw->pw_uid); 1374 (void) close(s); 1375 errno = t; 1376 return (NULL); 1377 } 1378 1379 FILE * 1380 dataconn(const char *name, off_t size, const char *mode) 1381 { 1382 char sizebuf[32]; 1383 FILE *file; 1384 int retry = 0, tos, keepalive; 1385 1386 file_size = size; 1387 byte_count = 0; 1388 if (size != (off_t) -1) 1389 (void)snprintf(sizebuf, sizeof(sizebuf), " (" LLF " byte%s)", 1390 (LLT)size, PLURAL(size)); 1391 else 1392 sizebuf[0] = '\0'; 1393 if (pdata >= 0) { 1394 struct sockinet from; 1395 int s, fromlen = sizeof(from.su_len); 1396 1397 (void) alarm(curclass.timeout); 1398 s = accept(pdata, (struct sockaddr *)&from.si_su, &fromlen); 1399 (void) alarm(0); 1400 if (s < 0) { 1401 reply(425, "Can't open data connection."); 1402 (void) close(pdata); 1403 pdata = -1; 1404 return (NULL); 1405 } 1406 (void) close(pdata); 1407 pdata = s; 1408 switch (from.su_family) { 1409 case AF_INET: 1410 #ifdef IP_TOS 1411 if (!mapped) { 1412 tos = IPTOS_THROUGHPUT; 1413 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1414 (char *)&tos, sizeof(int)); 1415 } 1416 break; 1417 #endif 1418 } 1419 /* Set keepalives on the socket to detect dropped conns. */ 1420 #ifdef SO_KEEPALIVE 1421 keepalive = 1; 1422 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1423 (char *)&keepalive, sizeof(int)); 1424 #endif 1425 reply(150, "Opening %s mode data connection for '%s'%s.", 1426 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1427 return (fdopen(pdata, mode)); 1428 } 1429 if (data >= 0) { 1430 reply(125, "Using existing data connection for '%s'%s.", 1431 name, sizebuf); 1432 usedefault = 1; 1433 return (fdopen(data, mode)); 1434 } 1435 if (usedefault) 1436 data_dest = his_addr; 1437 usedefault = 1; 1438 file = getdatasock(mode); 1439 if (file == NULL) { 1440 char hbuf[INET6_ADDRSTRLEN]; 1441 char pbuf[10]; 1442 1443 getnameinfo((struct sockaddr *)&data_source.si_su, 1444 data_source.su_len, hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1445 NI_NUMERICHOST | NI_NUMERICSERV); 1446 reply(425, "Can't create data socket (%s,%s): %s.", 1447 hbuf, pbuf, strerror(errno)); 1448 return (NULL); 1449 } 1450 data = fileno(file); 1451 while (connect(data, (struct sockaddr *)&data_dest.si_su, 1452 data_dest.su_len) < 0) { 1453 if (errno == EADDRINUSE && retry < swaitmax) { 1454 sleep((unsigned) swaitint); 1455 retry += swaitint; 1456 continue; 1457 } 1458 perror_reply(425, "Can't build data connection"); 1459 (void) fclose(file); 1460 data = -1; 1461 return (NULL); 1462 } 1463 reply(150, "Opening %s mode data connection for '%s'%s.", 1464 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1465 return (file); 1466 } 1467 1468 void 1469 closedataconn(FILE *fd) 1470 { 1471 1472 if (fd != NULL) 1473 (void)fclose(fd); 1474 data = -1; 1475 if (pdata >= 0) 1476 (void)close(pdata); 1477 pdata = -1; 1478 } 1479 1480 /* 1481 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1482 * encapsulation of the data subject * to Mode, Structure, and Type. 1483 * 1484 * NB: Form isn't handled. 1485 */ 1486 static int 1487 send_data(FILE *instr, FILE *outstr, off_t blksize, int isdata) 1488 { 1489 int c, filefd, netfd, rval; 1490 char *buf; 1491 1492 transflag = 1; 1493 rval = -1; 1494 buf = NULL; 1495 if (setjmp(urgcatch)) 1496 goto cleanup_send_data; 1497 1498 switch (type) { 1499 1500 case TYPE_A: 1501 /* XXXLUKEM: rate limit ascii send (get) */ 1502 (void) alarm(curclass.timeout); 1503 while ((c = getc(instr)) != EOF) { 1504 byte_count++; 1505 if (c == '\n') { 1506 if (ferror(outstr)) 1507 goto data_err; 1508 (void) putc('\r', outstr); 1509 if (isdata) { 1510 total_data_out++; 1511 total_data++; 1512 } 1513 total_bytes_out++; 1514 total_bytes++; 1515 } 1516 (void) putc(c, outstr); 1517 if (isdata) { 1518 total_data_out++; 1519 total_data++; 1520 } 1521 total_bytes_out++; 1522 total_bytes++; 1523 if ((byte_count % 4096) == 0) 1524 (void) alarm(curclass.timeout); 1525 } 1526 (void) alarm(0); 1527 fflush(outstr); 1528 if (ferror(instr)) 1529 goto file_err; 1530 if (ferror(outstr)) 1531 goto data_err; 1532 rval = 0; 1533 goto cleanup_send_data; 1534 1535 case TYPE_I: 1536 case TYPE_L: 1537 if ((buf = malloc((size_t)blksize)) == NULL) { 1538 perror_reply(451, "Local resource failure: malloc"); 1539 goto cleanup_send_data; 1540 } 1541 filefd = fileno(instr); 1542 netfd = fileno(outstr); 1543 (void) alarm(curclass.timeout); 1544 if (curclass.rateget) { 1545 while (1) { 1546 int d; 1547 struct timeval then, now, td; 1548 off_t bufrem; 1549 char *bufp; 1550 1551 (void)gettimeofday(&then, NULL); 1552 errno = c = d = 0; 1553 bufrem = curclass.rateget; 1554 while (bufrem > 0) { 1555 if ((c = read(filefd, buf, 1556 MIN(blksize, bufrem))) <= 0) 1557 goto senddone; 1558 (void) alarm(curclass.timeout); 1559 bufrem -= c; 1560 byte_count += c; 1561 if (isdata) { 1562 total_data_out += c; 1563 total_data += c; 1564 } 1565 total_bytes_out += c; 1566 total_bytes += c; 1567 for (bufp = buf; c > 0; 1568 c -= d, bufp += d) 1569 if ((d = 1570 write(netfd, bufp, c)) <= 0) 1571 break; 1572 if (d < 0) 1573 goto data_err; 1574 } 1575 (void)gettimeofday(&now, NULL); 1576 timersub(&now, &then, &td); 1577 if (td.tv_sec == 0) 1578 usleep(1000000 - td.tv_usec); 1579 } 1580 } else { 1581 while ((c = read(filefd, buf, (size_t)blksize)) > 0) { 1582 if (write(netfd, buf, c) != c) 1583 goto data_err; 1584 (void) alarm(curclass.timeout); 1585 byte_count += c; 1586 if (isdata) { 1587 total_data_out += c; 1588 total_data += c; 1589 } 1590 total_bytes_out += c; 1591 total_bytes += c; 1592 } 1593 } 1594 senddone: 1595 if (c < 0) 1596 goto file_err; 1597 rval = 0; 1598 goto cleanup_send_data; 1599 1600 default: 1601 reply(550, "Unimplemented TYPE %d in send_data", type); 1602 goto cleanup_send_data; 1603 } 1604 1605 data_err: 1606 (void) alarm(0); 1607 perror_reply(426, "Data connection"); 1608 goto cleanup_send_data; 1609 1610 file_err: 1611 (void) alarm(0); 1612 perror_reply(551, "Error on input file"); 1613 /* FALLTHROUGH */ 1614 1615 cleanup_send_data: 1616 (void) alarm(0); 1617 transflag = 0; 1618 if (buf) 1619 free(buf); 1620 if (isdata) { 1621 total_files_out++; 1622 total_files++; 1623 } 1624 total_xfers_out++; 1625 total_xfers++; 1626 return (rval); 1627 } 1628 1629 /* 1630 * Transfer data from peer to "outstr" using the appropriate encapulation of 1631 * the data subject to Mode, Structure, and Type. 1632 * 1633 * N.B.: Form isn't handled. 1634 */ 1635 static int 1636 receive_data(FILE *instr, FILE *outstr) 1637 { 1638 int c, bare_lfs, netfd, filefd, rval; 1639 char buf[BUFSIZ]; 1640 #ifdef __GNUC__ 1641 (void) &bare_lfs; 1642 #endif 1643 1644 bare_lfs = 0; 1645 transflag = 1; 1646 rval = -1; 1647 if (setjmp(urgcatch)) 1648 goto cleanup_recv_data; 1649 1650 switch (type) { 1651 1652 case TYPE_I: 1653 case TYPE_L: 1654 netfd = fileno(instr); 1655 filefd = fileno(outstr); 1656 (void) alarm(curclass.timeout); 1657 if (curclass.rateput) { 1658 while (1) { 1659 int d; 1660 struct timeval then, now, td; 1661 off_t bufrem; 1662 1663 (void)gettimeofday(&then, NULL); 1664 errno = c = d = 0; 1665 for (bufrem = curclass.rateput; bufrem > 0; ) { 1666 if ((c = read(netfd, buf, 1667 MIN(sizeof(buf), bufrem))) <= 0) 1668 goto recvdone; 1669 if ((d = write(filefd, buf, c)) != c) 1670 goto recvdone; 1671 (void) alarm(curclass.timeout); 1672 bufrem -= c; 1673 byte_count += c; 1674 total_data_in += c; 1675 total_data += c; 1676 total_bytes_in += c; 1677 total_bytes += c; 1678 } 1679 (void)gettimeofday(&now, NULL); 1680 timersub(&now, &then, &td); 1681 if (td.tv_sec == 0) 1682 usleep(1000000 - td.tv_usec); 1683 } 1684 } else { 1685 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1686 if (write(filefd, buf, c) != c) 1687 goto file_err; 1688 (void) alarm(curclass.timeout); 1689 byte_count += c; 1690 total_data_in += c; 1691 total_data += c; 1692 total_bytes_in += c; 1693 total_bytes += c; 1694 } 1695 } 1696 recvdone: 1697 if (c < 0) 1698 goto data_err; 1699 rval = 0; 1700 goto cleanup_recv_data; 1701 1702 case TYPE_E: 1703 reply(553, "TYPE E not implemented."); 1704 goto cleanup_recv_data; 1705 1706 case TYPE_A: 1707 (void) alarm(curclass.timeout); 1708 /* XXXLUKEM: rate limit ascii receive (put) */ 1709 while ((c = getc(instr)) != EOF) { 1710 byte_count++; 1711 total_data_in++; 1712 total_data++; 1713 total_bytes_in++; 1714 total_bytes++; 1715 if ((byte_count % 4096) == 0) 1716 (void) alarm(curclass.timeout); 1717 if (c == '\n') 1718 bare_lfs++; 1719 while (c == '\r') { 1720 if (ferror(outstr)) 1721 goto data_err; 1722 if ((c = getc(instr)) != '\n') { 1723 byte_count++; 1724 total_data_in++; 1725 total_data++; 1726 total_bytes_in++; 1727 total_bytes++; 1728 if ((byte_count % 4096) == 0) 1729 (void) alarm(curclass.timeout); 1730 (void) putc ('\r', outstr); 1731 if (c == '\0' || c == EOF) 1732 goto contin2; 1733 } 1734 } 1735 (void) putc(c, outstr); 1736 contin2: ; 1737 } 1738 (void) alarm(0); 1739 fflush(outstr); 1740 if (ferror(instr)) 1741 goto data_err; 1742 if (ferror(outstr)) 1743 goto file_err; 1744 if (bare_lfs) { 1745 reply(-226, 1746 "WARNING! %d bare linefeeds received in ASCII mode", 1747 bare_lfs); 1748 reply(0, "File may not have transferred correctly."); 1749 } 1750 rval = 0; 1751 goto cleanup_recv_data; 1752 1753 default: 1754 reply(550, "Unimplemented TYPE %d in receive_data", type); 1755 goto cleanup_recv_data; 1756 } 1757 1758 data_err: 1759 (void) alarm(0); 1760 perror_reply(426, "Data Connection"); 1761 goto cleanup_recv_data; 1762 1763 file_err: 1764 (void) alarm(0); 1765 perror_reply(452, "Error writing file"); 1766 goto cleanup_recv_data; 1767 1768 cleanup_recv_data: 1769 (void) alarm(0); 1770 transflag = 0; 1771 total_files_in++; 1772 total_files++; 1773 total_xfers_in++; 1774 total_xfers++; 1775 return (rval); 1776 } 1777 1778 void 1779 statcmd(void) 1780 { 1781 struct sockinet *su = NULL; 1782 static char ntop_buf[INET6_ADDRSTRLEN]; 1783 u_char *a, *p; 1784 int ispassive, af; 1785 off_t otbi, otbo, otb; 1786 1787 a = p = (u_char *)NULL; 1788 1789 reply(-211, "%s FTP server status:", hostname); 1790 reply(0, "Version: %s", EMPTYSTR(version) ? "<suppressed>" : version); 1791 ntop_buf[0] = '\0'; 1792 if (!getnameinfo((struct sockaddr *)&his_addr.si_su, his_addr.su_len, 1793 ntop_buf, sizeof(ntop_buf), NULL, 0, NI_NUMERICHOST) 1794 && strcmp(remotehost, ntop_buf) != 0) 1795 reply(0, "Connected to %s (%s)", remotehost, ntop_buf); 1796 else 1797 reply(0, "Connected to %s", remotehost); 1798 1799 if (logged_in) { 1800 if (curclass.type == CLASS_GUEST) 1801 reply(0, "Logged in anonymously"); 1802 else 1803 reply(0, "Logged in as %s%s", pw->pw_name, 1804 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 1805 } else if (askpasswd) 1806 reply(0, "Waiting for password"); 1807 else 1808 reply(0, "Waiting for user name"); 1809 cprintf(stdout, " TYPE: %s", typenames[type]); 1810 if (type == TYPE_A || type == TYPE_E) 1811 cprintf(stdout, ", FORM: %s", formnames[form]); 1812 if (type == TYPE_L) { 1813 #if NBBY == 8 1814 cprintf(stdout, " %d", NBBY); 1815 #else 1816 /* XXX: `bytesize' needs to be defined in this case */ 1817 cprintf(stdout, " %d", bytesize); 1818 #endif 1819 } 1820 cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n", 1821 strunames[stru], modenames[mode]); 1822 ispassive = 0; 1823 if (data != -1) { 1824 reply(0, "Data connection open"); 1825 su = NULL; 1826 } else if (pdata != -1) { 1827 reply(0, "in Passive mode"); 1828 su = (struct sockinet *)&pasv_addr; 1829 ispassive = 1; 1830 goto printaddr; 1831 } else if (usedefault == 0) { 1832 if (epsvall) { 1833 reply(0, "EPSV only mode (EPSV ALL)"); 1834 goto epsvonly; 1835 } 1836 su = (struct sockinet *)&data_dest; 1837 printaddr: 1838 /* PASV/PORT */ 1839 if (su->su_family == AF_INET) { 1840 a = (u_char *) &su->su_addr; 1841 p = (u_char *) &su->su_port; 1842 #define UC(b) (((int) b) & 0xff) 1843 reply(0, "%s (%d,%d,%d,%d,%d,%d)", 1844 ispassive ? "PASV" : "PORT" , 1845 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1846 UC(p[0]), UC(p[1])); 1847 } 1848 1849 /* LPSV/LPRT */ 1850 { 1851 int alen, af, i; 1852 1853 alen = 0; 1854 switch (su->su_family) { 1855 case AF_INET: 1856 a = (u_char *) &su->su_addr; 1857 p = (u_char *) &su->su_port; 1858 alen = sizeof(su->su_addr); 1859 af = 4; 1860 break; 1861 #ifdef INET6 1862 case AF_INET6: 1863 a = (u_char *) &su->su_6addr; 1864 p = (u_char *) &su->su_port; 1865 alen = sizeof(su->su_6addr); 1866 af = 6; 1867 break; 1868 #endif 1869 default: 1870 af = 0; 1871 break; 1872 } 1873 if (af) { 1874 cprintf(stdout, " %s (%d,%d", 1875 ispassive ? "LPSV" : "LPRT", af, alen); 1876 for (i = 0; i < alen; i++) 1877 cprintf(stdout, ",%d", UC(a[i])); 1878 cprintf(stdout, ",%d,%d,%d)", 2, UC(p[0]), UC(p[1])); 1879 #undef UC 1880 } 1881 } 1882 1883 /* EPRT/EPSV */ 1884 epsvonly: 1885 af = af2epsvproto(su->su_family); 1886 ntop_buf[0] = '\0'; 1887 if (af > 0) { 1888 if (getnameinfo((struct sockaddr *)&su->si_su, 1889 su->su_len, ntop_buf, sizeof(ntop_buf), NULL, 0, 1890 NI_NUMERICHOST) == 0) 1891 reply(0, "%s (|%d|%s|%d|)", 1892 ispassive ? "EPSV" : "EPRT", 1893 af, ntop_buf, ntohs(su->su_port)); 1894 } 1895 } else 1896 reply(0, "No data connection"); 1897 1898 if (logged_in) { 1899 reply(0, 1900 "Data sent: " LLF " byte%s in " LLF " file%s", 1901 (LLT)total_data_out, PLURAL(total_data_out), 1902 (LLT)total_files_out, PLURAL(total_files_out)); 1903 reply(0, 1904 "Data received: " LLF " byte%s in " LLF " file%s", 1905 (LLT)total_data_in, PLURAL(total_data_in), 1906 (LLT)total_files_in, PLURAL(total_files_in)); 1907 reply(0, 1908 "Total data: " LLF " byte%s in " LLF " file%s", 1909 (LLT)total_data, PLURAL(total_data), 1910 (LLT)total_files, PLURAL(total_files)); 1911 } 1912 otbi = total_bytes_in; 1913 otbo = total_bytes_out; 1914 otb = total_bytes; 1915 reply(0, "Traffic sent: " LLF " byte%s in " LLF " transfer%s", 1916 (LLT)otbo, PLURAL(otbo), 1917 (LLT)total_xfers_out, PLURAL(total_xfers_out)); 1918 reply(0, "Traffic received: " LLF " byte%s in " LLF " transfer%s", 1919 (LLT)otbi, PLURAL(otbi), 1920 (LLT)total_xfers_in, PLURAL(total_xfers_in)); 1921 reply(0, "Total traffic: " LLF " byte%s in " LLF " transfer%s", 1922 (LLT)otb, PLURAL(otb), 1923 (LLT)total_xfers, PLURAL(total_xfers)); 1924 1925 if (logged_in) { 1926 struct ftpconv *cp; 1927 1928 reply(0, "%s", ""); 1929 reply(0, "Class: %s, type: %s", 1930 curclass.classname, CURCLASSTYPE); 1931 reply(0, "Check PORT/LPRT commands: %sabled", 1932 curclass.checkportcmd ? "en" : "dis"); 1933 if (! EMPTYSTR(curclass.display)) 1934 reply(0, "Display file: %s", curclass.display); 1935 if (! EMPTYSTR(curclass.notify)) 1936 reply(0, "Notify fileglob: %s", curclass.notify); 1937 reply(0, "Idle timeout: %d, maximum timeout: %d", 1938 curclass.timeout, curclass.maxtimeout); 1939 reply(0, "Current connections: %d", connections); 1940 if (curclass.limit == -1) 1941 reply(0, "Maximum connections: unlimited"); 1942 else 1943 reply(0, "Maximum connections: %d", curclass.limit); 1944 if (curclass.limitfile) 1945 reply(0, "Connection limit exceeded file: %s", 1946 curclass.limitfile); 1947 if (! EMPTYSTR(curclass.chroot)) 1948 reply(0, "Chroot format: %s", curclass.chroot); 1949 if (! EMPTYSTR(curclass.homedir)) 1950 reply(0, "Homedir format: %s", curclass.homedir); 1951 if (! EMPTYSTR(curclass.motd)) 1952 reply(0, "MotD file: %s", curclass.motd); 1953 reply(0, 1954 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 1955 curclass.modify ? "en" : "dis"); 1956 reply(0, "Upload commands (APPE, STOR, STOU): %sabled", 1957 curclass.upload ? "en" : "dis"); 1958 if (curclass.portmin && curclass.portmax) 1959 reply(0, "PASV port range: %d - %d", 1960 curclass.portmin, curclass.portmax); 1961 if (curclass.rateget) 1962 reply(0, "Rate get limit: %d bytes/sec", 1963 curclass.rateget); 1964 else 1965 reply(0, "Rate get limit: disabled"); 1966 if (curclass.rateput) 1967 reply(0, "Rate put limit: %d bytes/sec", 1968 curclass.rateput); 1969 else 1970 reply(0, "Rate put limit: disabled"); 1971 reply(0, "Umask: %.04o", curclass.umask); 1972 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1973 if (cp->suffix == NULL || cp->types == NULL || 1974 cp->command == NULL) 1975 continue; 1976 reply(0, "Conversion: %s [%s] disable: %s, command: %s", 1977 cp->suffix, cp->types, cp->disable, cp->command); 1978 } 1979 } 1980 1981 reply(211, "End of status"); 1982 } 1983 1984 void 1985 fatal(const char *s) 1986 { 1987 1988 reply(451, "Error in server: %s\n", s); 1989 reply(221, "Closing connection due to server error."); 1990 dologout(0); 1991 /* NOTREACHED */ 1992 } 1993 1994 /* 1995 * reply() -- 1996 * depending on the value of n, display fmt with a trailing CRLF and 1997 * prefix of: 1998 * n < -1 prefix the message with abs(n) + "-" (initial line) 1999 * n == 0 prefix the message with 4 spaces (middle lines) 2000 * n > 0 prefix the message with n + " " (final line) 2001 */ 2002 void 2003 reply(int n, const char *fmt, ...) 2004 { 2005 off_t b; 2006 va_list ap; 2007 2008 va_start(ap, fmt); 2009 b = 0; 2010 if (n == 0) 2011 cprintf(stdout, " "); 2012 else if (n < 0) 2013 cprintf(stdout, "%d-", -n); 2014 else 2015 cprintf(stdout, "%d ", n); 2016 b = vprintf(fmt, ap); 2017 total_bytes += b; 2018 total_bytes_out += b; 2019 cprintf(stdout, "\r\n"); 2020 (void)fflush(stdout); 2021 if (debug) { 2022 syslog(LOG_DEBUG, "<--- %d%c", abs(n), (n < 0) ? '-' : ' '); 2023 vsyslog(LOG_DEBUG, fmt, ap); 2024 } 2025 } 2026 2027 static void 2028 dolog(struct sockaddr *who) 2029 { 2030 2031 (void)getnameinfo(who, who->sa_len, remotehost, sizeof(remotehost), 2032 NULL, 0, 0); 2033 2034 #ifdef HASSETPROCTITLE 2035 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2036 setproctitle("%s", proctitle); 2037 #endif /* HASSETPROCTITLE */ 2038 if (logging) 2039 syslog(LOG_INFO, "connection from %s to %s", 2040 remotehost, hostname); 2041 } 2042 2043 /* 2044 * Record logout in wtmp file 2045 * and exit with supplied status. 2046 */ 2047 void 2048 dologout(int status) 2049 { 2050 /* 2051 * Prevent reception of SIGURG from resulting in a resumption 2052 * back to the main program loop. 2053 */ 2054 transflag = 0; 2055 2056 if (logged_in) { 2057 if (dowtmp) 2058 logwtmp(ttyline, "", ""); 2059 if (doutmp) 2060 logout(utmp.ut_line); 2061 #ifdef KERBEROS 2062 if (!notickets && krbtkfile_env) 2063 unlink(krbtkfile_env); 2064 #endif 2065 } 2066 /* beware of flushing buffers after a SIGPIPE */ 2067 _exit(status); 2068 } 2069 2070 static void 2071 myoob(int signo) 2072 { 2073 char *cp; 2074 2075 /* only process if transfer occurring */ 2076 if (!transflag) 2077 return; 2078 cp = tmpline; 2079 if (getline(cp, 7, stdin) == NULL) { 2080 reply(221, "You could at least say goodbye."); 2081 dologout(0); 2082 } 2083 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2084 tmpline[0] = '\0'; 2085 reply(426, "Transfer aborted. Data connection closed."); 2086 reply(226, "Abort successful"); 2087 longjmp(urgcatch, 1); 2088 } 2089 if (strcasecmp(cp, "STAT\r\n") == 0) { 2090 tmpline[0] = '\0'; 2091 if (file_size != (off_t) -1) 2092 reply(213, 2093 "Status: " LLF " of " LLF " byte%s transferred", 2094 (LLT)byte_count, (LLT)file_size, 2095 PLURAL(byte_count)); 2096 else 2097 reply(213, "Status: " LLF " byte%s transferred", 2098 (LLT)byte_count, PLURAL(byte_count)); 2099 } 2100 } 2101 2102 static int 2103 bind_pasv_addr(void) 2104 { 2105 static int passiveport; 2106 int port, len; 2107 2108 len = pasv_addr.su_len; 2109 if (curclass.portmin == 0 && curclass.portmax == 0) { 2110 pasv_addr.su_port = 0; 2111 return (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len)); 2112 } 2113 2114 if (passiveport == 0) { 2115 srand(getpid()); 2116 passiveport = rand() % (curclass.portmax - curclass.portmin) 2117 + curclass.portmin; 2118 } 2119 2120 port = passiveport; 2121 while (1) { 2122 port++; 2123 if (port > curclass.portmax) 2124 port = curclass.portmin; 2125 else if (port == passiveport) { 2126 errno = EAGAIN; 2127 return (-1); 2128 } 2129 pasv_addr.su_port = htons(port); 2130 if (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len) == 0) 2131 break; 2132 if (errno != EADDRINUSE) 2133 return (-1); 2134 } 2135 passiveport = port; 2136 return (0); 2137 } 2138 2139 /* 2140 * Note: a response of 425 is not mentioned as a possible response to 2141 * the PASV command in RFC959. However, it has been blessed as 2142 * a legitimate response by Jon Postel in a telephone conversation 2143 * with Rick Adams on 25 Jan 89. 2144 */ 2145 void 2146 passive(void) 2147 { 2148 int len; 2149 char *p, *a; 2150 2151 if (pdata >= 0) 2152 close(pdata); 2153 pdata = socket(AF_INET, SOCK_STREAM, 0); 2154 if (pdata < 0 || !logged_in) { 2155 perror_reply(425, "Can't open passive connection"); 2156 return; 2157 } 2158 pasv_addr = ctrl_addr; 2159 2160 if (bind_pasv_addr() < 0) 2161 goto pasv_error; 2162 len = pasv_addr.su_len; 2163 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 2164 goto pasv_error; 2165 pasv_addr.su_len = len; 2166 if (listen(pdata, 1) < 0) 2167 goto pasv_error; 2168 a = (char *) &pasv_addr.su_addr; 2169 p = (char *) &pasv_addr.su_port; 2170 2171 #define UC(b) (((int) b) & 0xff) 2172 2173 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2174 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2175 return; 2176 2177 pasv_error: 2178 (void) close(pdata); 2179 pdata = -1; 2180 perror_reply(425, "Can't open passive connection"); 2181 return; 2182 } 2183 2184 /* 2185 * convert protocol identifier to/from AF 2186 */ 2187 int 2188 lpsvproto2af(int proto) 2189 { 2190 2191 switch (proto) { 2192 case 4: 2193 return AF_INET; 2194 #ifdef INET6 2195 case 6: 2196 return AF_INET6; 2197 #endif 2198 default: 2199 return -1; 2200 } 2201 } 2202 2203 int 2204 af2lpsvproto(int af) 2205 { 2206 2207 switch (af) { 2208 case AF_INET: 2209 return 4; 2210 #ifdef INET6 2211 case AF_INET6: 2212 return 6; 2213 #endif 2214 default: 2215 return -1; 2216 } 2217 } 2218 2219 int 2220 epsvproto2af(int proto) 2221 { 2222 2223 switch (proto) { 2224 case 1: 2225 return AF_INET; 2226 #ifdef INET6 2227 case 2: 2228 return AF_INET6; 2229 #endif 2230 default: 2231 return -1; 2232 } 2233 } 2234 2235 int 2236 af2epsvproto(int af) 2237 { 2238 2239 switch (af) { 2240 case AF_INET: 2241 return 1; 2242 #ifdef INET6 2243 case AF_INET6: 2244 return 2; 2245 #endif 2246 default: 2247 return -1; 2248 } 2249 } 2250 2251 /* 2252 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2253 * 229 Entering Extended Passive Mode (|||port|) 2254 */ 2255 void 2256 long_passive(char *cmd, int pf) 2257 { 2258 int len; 2259 char *p, *a; 2260 2261 if (!logged_in) { 2262 syslog(LOG_NOTICE, "long passive but not logged in"); 2263 reply(503, "Login with USER first."); 2264 return; 2265 } 2266 2267 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 2268 /* 2269 * XXX 2270 * only EPRT/EPSV ready clients will understand this 2271 */ 2272 if (strcmp(cmd, "EPSV") != 0) 2273 reply(501, "Network protocol mismatch"); /*XXX*/ 2274 else 2275 epsv_protounsupp("Network protocol mismatch"); 2276 2277 return; 2278 } 2279 2280 if (pdata >= 0) 2281 close(pdata); 2282 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2283 if (pdata < 0) { 2284 perror_reply(425, "Can't open passive connection"); 2285 return; 2286 } 2287 pasv_addr = ctrl_addr; 2288 if (bind_pasv_addr() < 0) 2289 goto pasv_error; 2290 len = pasv_addr.su_len; 2291 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 2292 goto pasv_error; 2293 pasv_addr.su_len = len; 2294 if (listen(pdata, 1) < 0) 2295 goto pasv_error; 2296 p = (char *) &pasv_addr.su_port; 2297 2298 #define UC(b) (((int) b) & 0xff) 2299 2300 if (strcmp(cmd, "LPSV") == 0) { 2301 switch (pasv_addr.su_family) { 2302 case AF_INET: 2303 a = (char *) &pasv_addr.su_addr; 2304 reply(228, 2305 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2306 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2307 2, UC(p[0]), UC(p[1])); 2308 return; 2309 #ifdef INET6 2310 case AF_INET6: 2311 a = (char *) &pasv_addr.su_6addr; 2312 reply(228, 2313 "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)", 2314 6, 16, 2315 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2316 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2317 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2318 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2319 2, UC(p[0]), UC(p[1])); 2320 return; 2321 #endif 2322 } 2323 #undef UC 2324 } else if (strcmp(cmd, "EPSV") == 0) { 2325 switch (pasv_addr.su_family) { 2326 case AF_INET: 2327 #ifdef INET6 2328 case AF_INET6: 2329 #endif 2330 reply(229, "Entering Extended Passive Mode (|||%d|)", 2331 ntohs(pasv_addr.su_port)); 2332 return; 2333 } 2334 } else { 2335 /* more proper error code? */ 2336 } 2337 2338 pasv_error: 2339 (void) close(pdata); 2340 pdata = -1; 2341 perror_reply(425, "Can't open passive connection"); 2342 return; 2343 } 2344 2345 int 2346 extended_port(const char *arg) 2347 { 2348 #ifdef INET6 /*not really IPv6-only. just to avoid the use of getaddrinfo*/ 2349 char *tmp = NULL; 2350 char *result[3]; 2351 char *p, *q; 2352 char delim; 2353 struct addrinfo hints; 2354 struct addrinfo *res = NULL; 2355 int i; 2356 unsigned long proto; 2357 2358 tmp = xstrdup(arg); 2359 p = tmp; 2360 delim = p[0]; 2361 p++; 2362 memset(result, 0, sizeof(result)); 2363 for (i = 0; i < 3; i++) { 2364 q = strchr(p, delim); 2365 if (!q || *q != delim) 2366 goto parsefail; 2367 *q++ = '\0'; 2368 result[i] = p; 2369 p = q; 2370 } 2371 2372 /* some more sanity check */ 2373 p = NULL; 2374 (void)strtoul(result[2], &p, 10); 2375 if (!*result[2] || *p) 2376 goto parsefail; 2377 p = NULL; 2378 proto = strtoul(result[0], &p, 10); 2379 if (!*result[0] || *p) 2380 goto protounsupp; 2381 2382 memset(&hints, 0, sizeof(hints)); 2383 hints.ai_family = epsvproto2af((int)proto); 2384 if (hints.ai_family < 0) 2385 goto protounsupp; 2386 hints.ai_socktype = SOCK_STREAM; 2387 hints.ai_flags = AI_NUMERICHOST; 2388 if (getaddrinfo(result[1], result[2], &hints, &res)) 2389 goto parsefail; 2390 if (res->ai_next) 2391 goto parsefail; 2392 if (sizeof(data_dest) < res->ai_addrlen) 2393 goto parsefail; 2394 memcpy(&data_dest, res->ai_addr, res->ai_addrlen); 2395 if (his_addr.su_family == AF_INET6 && 2396 data_dest.su_family == AF_INET6) { 2397 /* XXX more sanity checks! */ 2398 data_dest.su_scope_id = his_addr.su_scope_id; 2399 } 2400 2401 if (tmp != NULL) 2402 free(tmp); 2403 if (res) 2404 freeaddrinfo(res); 2405 return 0; 2406 2407 parsefail: 2408 reply(500, "Invalid argument, rejected."); 2409 usedefault = 1; 2410 if (tmp != NULL) 2411 free(tmp); 2412 if (res) 2413 freeaddrinfo(res); 2414 return -1; 2415 2416 protounsupp: 2417 epsv_protounsupp("Protocol not supported"); 2418 usedefault = 1; 2419 if (tmp != NULL) 2420 free(tmp); 2421 if (res) 2422 freeaddrinfo(res); 2423 return -1; 2424 #else 2425 reply(500, "Invalid argument, rejected."); 2426 return -1; 2427 #endif 2428 } 2429 2430 /* 2431 * 522 Protocol not supported (proto,...) 2432 * as we assume address family for control and data connections are the same, 2433 * we do not return the list of address families we support - instead, we 2434 * return the address family of the control connection. 2435 */ 2436 void 2437 epsv_protounsupp(const char *message) 2438 { 2439 int proto; 2440 2441 proto = af2epsvproto(ctrl_addr.su_family); 2442 if (proto < 0) 2443 reply(501, "%s", message); /*XXX*/ 2444 else 2445 reply(522, "%s, use (%d)", message, proto); 2446 } 2447 2448 /* 2449 * Generate unique name for file with basename "local". 2450 * The file named "local" is already known to exist. 2451 * Generates failure reply on error. 2452 * 2453 * XXX: this function should under go changes similar to 2454 * the mktemp(3)/mkstemp(3) changes. 2455 */ 2456 static char * 2457 gunique(const char *local) 2458 { 2459 static char new[MAXPATHLEN]; 2460 struct stat st; 2461 char *cp; 2462 int count; 2463 2464 cp = strrchr(local, '/'); 2465 if (cp) 2466 *cp = '\0'; 2467 if (stat(cp ? local : ".", &st) < 0) { 2468 perror_reply(553, cp ? local : "."); 2469 return (NULL); 2470 } 2471 if (cp) 2472 *cp = '/'; 2473 for (count = 1; count < 100; count++) { 2474 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2475 if (stat(new, &st) < 0) 2476 return (new); 2477 } 2478 reply(452, "Unique file name cannot be created."); 2479 return (NULL); 2480 } 2481 2482 /* 2483 * Format and send reply containing system error number. 2484 */ 2485 void 2486 perror_reply(int code, const char *string) 2487 { 2488 int save_errno; 2489 2490 save_errno = errno; 2491 reply(code, "%s: %s.", string, strerror(errno)); 2492 errno = save_errno; 2493 } 2494 2495 static char *onefile[] = { 2496 "", 2497 0 2498 }; 2499 2500 void 2501 send_file_list(const char *whichf) 2502 { 2503 struct stat st; 2504 DIR *dirp = NULL; 2505 struct dirent *dir; 2506 FILE *dout = NULL; 2507 char **dirlist, *dirname, *p; 2508 int simple = 0; 2509 int freeglob = 0; 2510 glob_t gl; 2511 off_t b; 2512 2513 #ifdef __GNUC__ 2514 (void) &dout; 2515 (void) &dirlist; 2516 (void) &simple; 2517 (void) &freeglob; 2518 #endif 2519 2520 p = NULL; 2521 if (strpbrk(whichf, "~{[*?") != NULL) { 2522 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2523 2524 memset(&gl, 0, sizeof(gl)); 2525 freeglob = 1; 2526 if (glob(whichf, flags, 0, &gl)) { 2527 reply(550, "not found"); 2528 goto out; 2529 } else if (gl.gl_pathc == 0) { 2530 errno = ENOENT; 2531 perror_reply(550, whichf); 2532 goto out; 2533 } 2534 dirlist = gl.gl_pathv; 2535 } else { 2536 p = xstrdup(whichf); 2537 onefile[0] = p; 2538 dirlist = onefile; 2539 simple = 1; 2540 } 2541 /* XXX: } for vi sm */ 2542 2543 if (setjmp(urgcatch)) { 2544 transflag = 0; 2545 goto out; 2546 } 2547 while ((dirname = *dirlist++) != NULL) { 2548 int trailingslash = 0; 2549 2550 if (stat(dirname, &st) < 0) { 2551 /* 2552 * If user typed "ls -l", etc, and the client 2553 * used NLST, do what the user meant. 2554 */ 2555 /* XXX: nuke this support? */ 2556 if (dirname[0] == '-' && *dirlist == NULL && 2557 transflag == 0) { 2558 char *argv[] = { INTERNAL_LS, "", NULL }; 2559 2560 argv[1] = dirname; 2561 retrieve(argv, dirname); 2562 goto out; 2563 } 2564 perror_reply(550, whichf); 2565 goto cleanup_send_file_list; 2566 } 2567 2568 if (S_ISREG(st.st_mode)) { 2569 if (dout == NULL) { 2570 dout = dataconn("file list", (off_t)-1, "w"); 2571 if (dout == NULL) 2572 goto out; 2573 transflag++; 2574 } 2575 b = fprintf(dout, "%s%s\n", dirname, 2576 type == TYPE_A ? "\r" : ""); 2577 total_bytes += b; 2578 total_bytes_out += b; 2579 byte_count += strlen(dirname) + 1; 2580 continue; 2581 } else if (!S_ISDIR(st.st_mode)) 2582 continue; 2583 2584 if (dirname[strlen(dirname) - 1] == '/') 2585 trailingslash++; 2586 2587 if ((dirp = opendir(dirname)) == NULL) 2588 continue; 2589 2590 while ((dir = readdir(dirp)) != NULL) { 2591 char nbuf[MAXPATHLEN]; 2592 2593 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 2594 continue; 2595 2596 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2597 trailingslash ? "" : "/", dir->d_name); 2598 2599 /* 2600 * We have to do a stat to ensure it's 2601 * not a directory or special file. 2602 */ 2603 /* XXX: follow RFC959 and filter out non files ? */ 2604 if (simple || (stat(nbuf, &st) == 0 && 2605 S_ISREG(st.st_mode))) { 2606 char *p; 2607 2608 if (dout == NULL) { 2609 dout = dataconn("file list", (off_t)-1, 2610 "w"); 2611 if (dout == NULL) 2612 goto out; 2613 transflag++; 2614 } 2615 p = nbuf; 2616 if (nbuf[0] == '.' && nbuf[1] == '/') 2617 p = &nbuf[2]; 2618 b = fprintf(dout, "%s%s\n", p, 2619 type == TYPE_A ? "\r" : ""); 2620 total_bytes += b; 2621 total_bytes_out += b; 2622 byte_count += strlen(nbuf) + 1; 2623 } 2624 } 2625 (void) closedir(dirp); 2626 } 2627 2628 if (dout == NULL) 2629 reply(550, "No files found."); 2630 else if (ferror(dout) != 0) 2631 perror_reply(550, "Data connection"); 2632 else 2633 reply(226, "Transfer complete."); 2634 2635 cleanup_send_file_list: 2636 transflag = 0; 2637 closedataconn(dout); 2638 out: 2639 total_xfers++; 2640 total_xfers_out++; 2641 if (p) 2642 free(p); 2643 if (freeglob) 2644 globfree(&gl); 2645 } 2646 2647 char * 2648 conffilename(const char *s) 2649 { 2650 static char filename[MAXPATHLEN]; 2651 2652 if (*s == '/') 2653 strlcpy(filename, s, sizeof(filename)); 2654 else 2655 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2656 return (filename); 2657 } 2658 2659 /* 2660 * logcmd -- 2661 * based on the arguments, syslog a message: 2662 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2663 * else if file2 != NULL "<command> <file1> <file2>" 2664 * else "<command> <file1>" 2665 * if elapsed != NULL, append "in xxx.yyy seconds" 2666 * if error != NULL, append ": " + error 2667 */ 2668 void 2669 logcmd(const char *command, off_t bytes, const char *file1, const char *file2, 2670 const struct timeval *elapsed, const char *error) 2671 { 2672 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN]; 2673 const char *p; 2674 size_t len; 2675 2676 if (logging <=1) 2677 return; 2678 2679 if ((p = realpath(file1, realfile)) == NULL) 2680 p = file1; 2681 len = snprintf(buf, sizeof(buf), "%s %s", command, p); 2682 2683 if (bytes != (off_t)-1) { 2684 len += snprintf(buf + len, sizeof(buf) - len, 2685 " = " LLF " byte%s", (LLT) bytes, PLURAL(bytes)); 2686 } else if (file2 != NULL) { 2687 if ((p = realpath(file2, realfile)) == NULL) 2688 p = file2; 2689 len += snprintf(buf + len, sizeof(buf) - len, " %s", p); 2690 } 2691 2692 if (elapsed != NULL) { 2693 len += snprintf(buf + len, sizeof(buf) - len, 2694 " in %ld.%.03d seconds", elapsed->tv_sec, 2695 (int)(elapsed->tv_usec / 1000)); 2696 } 2697 2698 if (error != NULL) 2699 len += snprintf(buf + len, sizeof(buf) - len, ": %s", error); 2700 2701 syslog(LOG_INFO, "%s", buf); 2702 } 2703 2704 char * 2705 xstrdup(const char *s) 2706 { 2707 char *new = strdup(s); 2708 2709 if (new == NULL) 2710 fatal("Local resource failure: malloc"); 2711 /* NOTREACHED */ 2712 return (new); 2713 } 2714 2715 /* 2716 * As per fprintf(), but increment total_bytes and total_bytes_out, 2717 * by the appropriate amount. 2718 */ 2719 void 2720 cprintf(FILE *fd, const char *fmt, ...) 2721 { 2722 off_t b; 2723 va_list ap; 2724 2725 va_start(ap, fmt); 2726 b = vfprintf(fd, fmt, ap); 2727 total_bytes += b; 2728 total_bytes_out += b; 2729 } 2730
Indexes created Thu Sep 25 16:09:42 GMT 2025