1 /* $NetBSD: ftpd.c,v 1.145 2002/10/07 13:29:59 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2001 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 1.145 2002/10/07 13:29:59 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 #include <sys/mman.h> 125 #include <sys/resource.h> 126 127 #include <netinet/in.h> 128 #include <netinet/in_systm.h> 129 #include <netinet/ip.h> 130 131 #define FTP_NAMES 132 #include <arpa/ftp.h> 133 #include <arpa/inet.h> 134 #include <arpa/telnet.h> 135 136 #include <ctype.h> 137 #include <dirent.h> 138 #include <err.h> 139 #include <errno.h> 140 #include <fcntl.h> 141 #include <fnmatch.h> 142 #include <glob.h> 143 #include <grp.h> 144 #include <limits.h> 145 #include <netdb.h> 146 #include <pwd.h> 147 #include <setjmp.h> 148 #include <signal.h> 149 #include <stdarg.h> 150 #include <stdio.h> 151 #include <stdlib.h> 152 #include <string.h> 153 #include <syslog.h> 154 #include <time.h> 155 #include <tzfile.h> 156 #include <unistd.h> 157 #include <util.h> 158 #ifdef SUPPORT_UTMP 159 #include <utmp.h> 160 #endif 161 #ifdef SUPPORT_UTMPX 162 #include <utmpx.h> 163 #endif 164 #ifdef SKEY 165 #include <skey.h> 166 #endif 167 #ifdef KERBEROS5 168 #include <com_err.h> 169 #include <krb5/krb5.h> 170 #endif 171 172 #define GLOBAL 173 #include "extern.h" 174 #include "pathnames.h" 175 #include "version.h" 176 177 int data; 178 jmp_buf urgcatch; 179 int sflag; 180 int stru; /* avoid C keyword */ 181 int mode; 182 int dataport; /* use specific data port */ 183 int dopidfile; /* maintain pid file */ 184 int doutmp; /* update utmp file */ 185 int dowtmp; /* update wtmp file */ 186 int doxferlog; /* syslog wu-ftpd style xferlog entries */ 187 int dropprivs; /* if privileges should or have been dropped */ 188 int mapped; /* IPv4 connection on AF_INET6 socket */ 189 off_t file_size; 190 off_t byte_count; 191 static char ttyline[20]; 192 #ifdef SUPPORT_UTMP 193 static struct utmp utmp; /* for utmp */ 194 #endif 195 #ifdef SUPPORT_UTMPX 196 static struct utmpx utmpx; /* for utmpx */ 197 #endif 198 199 static const char *anondir = NULL; 200 static const char *confdir = _DEFAULT_CONFDIR; 201 202 #if defined(KERBEROS) || defined(KERBEROS5) 203 int has_ccache = 0; 204 int notickets = 1; 205 char *krbtkfile_env = NULL; 206 char *tty = ttyline; 207 int login_krb5_forwardable_tgt = 0; 208 #endif 209 210 int epsvall = 0; 211 212 /* 213 * Timeout intervals for retrying connections 214 * to hosts that don't accept PORT cmds. This 215 * is a kludge, but given the problems with TCP... 216 */ 217 #define SWAITMAX 90 /* wait at most 90 seconds */ 218 #define SWAITINT 5 /* interval between retries */ 219 220 int swaitmax = SWAITMAX; 221 int swaitint = SWAITINT; 222 223 enum send_status { 224 SS_SUCCESS, 225 SS_NO_TRANSFER, /* no transfer made yet */ 226 SS_FILE_ERROR, /* file read error */ 227 SS_DATA_ERROR /* data send error */ 228 }; 229 230 static int bind_pasv_addr(void); 231 static int checkuser(const char *, const char *, int, int, char **); 232 static int checkaccess(const char *); 233 static int checkpassword(const struct passwd *, const char *); 234 static void end_login(void); 235 static FILE *getdatasock(const char *); 236 static char *gunique(const char *); 237 static void login_utmp(const char *, const char *, const char *); 238 static void logremotehost(struct sockinet *); 239 static void lostconn(int); 240 static void myoob(int); 241 static int receive_data(FILE *, FILE *); 242 static int send_data(FILE *, FILE *, const struct stat *, int); 243 static struct passwd *sgetpwnam(const char *); 244 static int write_data(int, char *, size_t, off_t *, struct timeval *, 245 int); 246 static enum send_status 247 send_data_with_read(int, int, const struct stat *, int); 248 static enum send_status 249 send_data_with_mmap(int, int, const struct stat *, int); 250 static void logrusage(const struct rusage *, const struct rusage *); 251 static void logout_utmp(void); 252 253 int main(int, char *[]); 254 255 #if defined(KERBEROS) 256 int klogin(struct passwd *, char *, char *, char *); 257 void kdestroy(void); 258 #endif 259 #if defined(KERBEROS5) 260 int k5login(struct passwd *, char *, char *, char *); 261 void k5destroy(void); 262 #endif 263 264 int 265 main(int argc, char *argv[]) 266 { 267 int addrlen, ch, on = 1, tos, keepalive; 268 #ifdef KERBEROS5 269 krb5_error_code kerror; 270 #endif 271 char *p; 272 273 connections = 1; 274 debug = 0; 275 logging = 0; 276 pdata = -1; 277 sflag = 0; 278 dataport = 0; 279 dopidfile = 1; /* default: DO use a pid file to count users */ 280 doutmp = 0; /* default: Do NOT log to utmp */ 281 dowtmp = 1; /* default: DO log to wtmp */ 282 doxferlog = 0; /* default: Do NOT syslog xferlog */ 283 dropprivs = 0; 284 mapped = 0; 285 usedefault = 1; 286 emailaddr = NULL; 287 hostname[0] = '\0'; 288 homedir[0] = '\0'; 289 gidcount = 0; 290 is_oob = 0; 291 version = FTPD_VERSION; 292 293 /* 294 * LOG_NDELAY sets up the logging connection immediately, 295 * necessary for anonymous ftp's that chroot and can't do it later. 296 */ 297 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 298 299 while ((ch = getopt(argc, argv, "a:c:C:de:h:HlP:qQrst:T:uUvV:wWX")) 300 != -1) { 301 switch (ch) { 302 case 'a': 303 anondir = optarg; 304 break; 305 306 case 'c': 307 confdir = optarg; 308 break; 309 310 case 'C': 311 pw = sgetpwnam(optarg); 312 exit(checkaccess(optarg) ? 0 : 1); 313 /* NOTREACHED */ 314 315 case 'd': 316 case 'v': /* deprecated */ 317 debug = 1; 318 break; 319 320 case 'e': 321 emailaddr = optarg; 322 break; 323 324 case 'h': 325 strlcpy(hostname, optarg, sizeof(hostname)); 326 break; 327 328 case 'H': 329 if (gethostname(hostname, sizeof(hostname)) == -1) 330 hostname[0] = '\0'; 331 hostname[sizeof(hostname) - 1] = '\0'; 332 break; 333 334 case 'l': 335 logging++; /* > 1 == extra logging */ 336 break; 337 338 case 'P': 339 dataport = (int)strtol(optarg, &p, 10); 340 if (*p != '\0' || dataport < IPPORT_RESERVED || 341 dataport > IPPORT_ANONMAX) { 342 syslog(LOG_WARNING, "Invalid dataport %s", 343 optarg); 344 dataport = 0; 345 } 346 break; 347 348 case 'q': 349 dopidfile = 1; 350 break; 351 352 case 'Q': 353 dopidfile = 0; 354 break; 355 356 case 'r': 357 dropprivs = 1; 358 break; 359 360 case 's': 361 sflag = 1; 362 break; 363 364 case 't': 365 case 'T': 366 syslog(LOG_WARNING, 367 "-%c has been deprecated in favour of ftpd.conf", 368 ch); 369 break; 370 371 case 'u': 372 doutmp = 1; 373 break; 374 375 case 'U': 376 doutmp = 0; 377 break; 378 379 case 'V': 380 if (EMPTYSTR(optarg) || strcmp(optarg, "-") == 0) 381 version = NULL; 382 else 383 version = xstrdup(optarg); 384 break; 385 386 case 'w': 387 dowtmp = 1; 388 break; 389 390 case 'W': 391 dowtmp = 0; 392 break; 393 394 case 'X': 395 doxferlog = 1; 396 break; 397 398 default: 399 if (optopt == 'a' || optopt == 'C') 400 exit(1); 401 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 402 break; 403 } 404 } 405 if (EMPTYSTR(confdir)) 406 confdir = _DEFAULT_CONFDIR; 407 408 memset((char *)&his_addr, 0, sizeof(his_addr)); 409 addrlen = sizeof(his_addr.si_su); 410 if (getpeername(0, (struct sockaddr *)&his_addr.si_su, &addrlen) < 0) { 411 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 412 exit(1); 413 } 414 his_addr.su_len = addrlen; 415 memset((char *)&ctrl_addr, 0, sizeof(ctrl_addr)); 416 addrlen = sizeof(ctrl_addr.si_su); 417 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 418 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 419 exit(1); 420 } 421 ctrl_addr.su_len = addrlen; 422 #ifdef INET6 423 if (his_addr.su_family == AF_INET6 424 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_6addr)) { 425 #if 1 426 /* 427 * IPv4 control connection arrived to AF_INET6 socket. 428 * I hate to do this, but this is the easiest solution. 429 * 430 * The assumption is untrue on SIIT environment. 431 */ 432 struct sockinet tmp_addr; 433 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 434 435 tmp_addr = his_addr; 436 memset(&his_addr, 0, sizeof(his_addr)); 437 his_addr.su_family = AF_INET; 438 his_addr.su_len = sizeof(his_addr.si_su.su_sin); 439 memcpy(&his_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 440 sizeof(his_addr.su_addr)); 441 his_addr.su_port = tmp_addr.su_port; 442 443 tmp_addr = ctrl_addr; 444 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 445 ctrl_addr.su_family = AF_INET; 446 ctrl_addr.su_len = sizeof(ctrl_addr.si_su.su_sin); 447 memcpy(&ctrl_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 448 sizeof(ctrl_addr.su_addr)); 449 ctrl_addr.su_port = tmp_addr.su_port; 450 #else 451 while (fgets(line, sizeof(line), fd) != NULL) { 452 if ((cp = strchr(line, '\n')) != NULL) 453 *cp = '\0'; 454 reply(-530, "%s", line); 455 } 456 (void) fflush(stdout); 457 (void) fclose(fd); 458 reply(530, 459 "Connection from IPv4 mapped address is not supported."); 460 exit(0); 461 #endif 462 463 mapped = 1; 464 } else 465 #endif /* INET6 */ 466 mapped = 0; 467 #ifdef IP_TOS 468 if (!mapped && his_addr.su_family == AF_INET) { 469 tos = IPTOS_LOWDELAY; 470 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 471 sizeof(int)) < 0) 472 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 473 } 474 #endif 475 /* if the hostname hasn't been given, attempt to determine it */ 476 if (hostname[0] == '\0') { 477 if (getnameinfo((struct sockaddr *)&ctrl_addr.si_su, 478 ctrl_addr.su_len, hostname, sizeof(hostname), NULL, 0, 0) 479 != 0) 480 (void)gethostname(hostname, sizeof(hostname)); 481 hostname[sizeof(hostname) - 1] = '\0'; 482 } 483 484 /* set this here so klogin can use it... */ 485 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 486 487 (void) freopen(_PATH_DEVNULL, "w", stderr); 488 (void) signal(SIGPIPE, lostconn); 489 (void) signal(SIGCHLD, SIG_IGN); 490 if (signal(SIGURG, myoob) == SIG_ERR) 491 syslog(LOG_WARNING, "signal: %m"); 492 493 /* Try to handle urgent data inline */ 494 #ifdef SO_OOBINLINE 495 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 496 syslog(LOG_WARNING, "setsockopt: %m"); 497 #endif 498 /* Set keepalives on the socket to detect dropped connections. */ 499 #ifdef SO_KEEPALIVE 500 keepalive = 1; 501 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 502 sizeof(int)) < 0) 503 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 504 #endif 505 506 #ifdef F_SETOWN 507 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 508 syslog(LOG_WARNING, "fcntl F_SETOWN: %m"); 509 #endif 510 logremotehost(&his_addr); 511 /* 512 * Set up default state 513 */ 514 data = -1; 515 type = TYPE_A; 516 form = FORM_N; 517 stru = STRU_F; 518 mode = MODE_S; 519 tmpline[0] = '\0'; 520 hasyyerrored = 0; 521 522 #ifdef KERBEROS5 523 kerror = krb5_init_context(&kcontext); 524 if (kerror) { 525 syslog(LOG_ERR, "%s when initializing Kerberos context", 526 error_message(kerror)); 527 exit(0); 528 } 529 #endif /* KERBEROS5 */ 530 531 init_curclass(); 532 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 533 curclass.type = CLASS_REAL; 534 535 /* If logins are disabled, print out the message. */ 536 if (display_file(_PATH_NOLOGIN, 530)) { 537 reply(530, "System not available."); 538 exit(0); 539 } 540 (void)display_file(conffilename(_PATH_FTPWELCOME), 220); 541 /* reply(220,) must follow */ 542 if (EMPTYSTR(version)) 543 reply(220, "%s FTP server ready.", hostname); 544 else 545 reply(220, "%s FTP server (%s) ready.", hostname, version); 546 547 (void) setjmp(errcatch); 548 ftp_loop(); 549 /* NOTREACHED */ 550 } 551 552 static void 553 lostconn(int signo) 554 { 555 556 if (debug) 557 syslog(LOG_DEBUG, "lost connection"); 558 dologout(1); 559 } 560 561 /* 562 * Save the result of a getpwnam. Used for USER command, since 563 * the data returned must not be clobbered by any other command 564 * (e.g., globbing). 565 */ 566 static struct passwd * 567 sgetpwnam(const char *name) 568 { 569 static struct passwd save; 570 struct passwd *p; 571 572 if ((p = getpwnam(name)) == NULL) 573 return (p); 574 if (save.pw_name) { 575 free((char *)save.pw_name); 576 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 577 free((char *)save.pw_passwd); 578 free((char *)save.pw_gecos); 579 free((char *)save.pw_dir); 580 free((char *)save.pw_shell); 581 } 582 save = *p; 583 save.pw_name = xstrdup(p->pw_name); 584 save.pw_passwd = xstrdup(p->pw_passwd); 585 save.pw_gecos = xstrdup(p->pw_gecos); 586 save.pw_dir = xstrdup(p->pw_dir); 587 save.pw_shell = xstrdup(p->pw_shell); 588 return (&save); 589 } 590 591 static int login_attempts; /* number of failed login attempts */ 592 static int askpasswd; /* had USER command, ask for PASSwd */ 593 static int permitted; /* USER permitted */ 594 static char curname[LOGIN_NAME_MAX]; /* current USER name */ 595 596 /* 597 * USER command. 598 * Sets global passwd pointer pw if named account exists and is acceptable; 599 * sets askpasswd if a PASS command is expected. If logged in previously, 600 * need to reset state. If name is "ftp" or "anonymous", the name is not in 601 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 602 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 603 * requesting login privileges. Disallow anyone who does not have a standard 604 * shell as returned by getusershell(). Disallow anyone mentioned in the file 605 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 606 */ 607 void 608 user(const char *name) 609 { 610 char *class; 611 612 class = NULL; 613 if (logged_in) { 614 switch (curclass.type) { 615 case CLASS_GUEST: 616 reply(530, "Can't change user from guest login."); 617 return; 618 case CLASS_CHROOT: 619 reply(530, "Can't change user from chroot user."); 620 return; 621 case CLASS_REAL: 622 if (dropprivs) { 623 reply(530, "Can't change user."); 624 return; 625 } 626 end_login(); 627 break; 628 default: 629 abort(); 630 } 631 } 632 633 #if defined(KERBEROS) 634 kdestroy(); 635 #endif 636 #if defined(KERBEROS5) 637 k5destroy(); 638 #endif 639 640 curclass.type = CLASS_REAL; 641 askpasswd = 0; 642 permitted = 0; 643 644 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 645 /* need `pw' setup for checkaccess() and checkuser () */ 646 if ((pw = sgetpwnam("ftp")) == NULL) 647 reply(530, "User %s unknown.", name); 648 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 649 reply(530, "User %s access denied.", name); 650 else { 651 curclass.type = CLASS_GUEST; 652 askpasswd = 1; 653 reply(331, 654 "Guest login ok, type your name as password."); 655 } 656 if (!askpasswd) { 657 if (logging) 658 syslog(LOG_NOTICE, 659 "ANONYMOUS FTP LOGIN REFUSED FROM %s", 660 remotehost); 661 end_login(); 662 goto cleanup_user; 663 } 664 name = "ftp"; 665 } else 666 pw = sgetpwnam(name); 667 668 if (logging) 669 strlcpy(curname, name, sizeof(curname)); 670 671 /* check user in /etc/ftpusers, and setup class */ 672 permitted = checkuser(_PATH_FTPUSERS, curname, 1, 0, &class); 673 674 /* check user in /etc/ftpchroot */ 675 if (checkuser(_PATH_FTPCHROOT, curname, 0, 0, NULL)) { 676 if (curclass.type == CLASS_GUEST) { 677 syslog(LOG_NOTICE, 678 "Can't change guest user to chroot class; remove entry in %s", 679 _PATH_FTPCHROOT); 680 exit(1); 681 } 682 curclass.type = CLASS_CHROOT; 683 } 684 /* determine default class */ 685 if (class == NULL) { 686 switch (curclass.type) { 687 case CLASS_GUEST: 688 class = xstrdup("guest"); 689 break; 690 case CLASS_CHROOT: 691 class = xstrdup("chroot"); 692 break; 693 case CLASS_REAL: 694 class = xstrdup("real"); 695 break; 696 default: 697 syslog(LOG_ERR, "unknown curclass.type %d; aborting", 698 curclass.type); 699 abort(); 700 } 701 } 702 /* parse ftpd.conf, setting up various parameters */ 703 parse_conf(class); 704 /* if not guest user, check for valid shell */ 705 if (pw == NULL) 706 permitted = 0; 707 else { 708 const char *cp, *shell; 709 710 if ((shell = pw->pw_shell) == NULL || *shell == 0) 711 shell = _PATH_BSHELL; 712 while ((cp = getusershell()) != NULL) 713 if (strcmp(cp, shell) == 0) 714 break; 715 endusershell(); 716 if (cp == NULL && curclass.type != CLASS_GUEST) 717 permitted = 0; 718 } 719 720 /* deny quickly (after USER not PASS) if requested */ 721 if (CURCLASS_FLAGS_ISSET(denyquick) && !permitted) { 722 reply(530, "User %s may not use FTP.", curname); 723 if (logging) 724 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 725 remotehost, curname); 726 end_login(); 727 goto cleanup_user; 728 } 729 730 /* if haven't asked yet (i.e, not anon), ask now */ 731 if (!askpasswd) { 732 askpasswd = 1; 733 #ifdef SKEY 734 if (skey_haskey(curname) == 0) { 735 const char *myskey; 736 737 myskey = skey_keyinfo(curname); 738 reply(331, "Password [ %s ] required for %s.", 739 myskey ? myskey : "error getting challenge", 740 curname); 741 } else 742 #endif 743 reply(331, "Password required for %s.", curname); 744 } 745 746 cleanup_user: 747 /* 748 * Delay before reading passwd after first failed 749 * attempt to slow down passwd-guessing programs. 750 */ 751 if (login_attempts) 752 sleep((unsigned) login_attempts); 753 754 if (class) 755 free(class); 756 } 757 758 /* 759 * Determine whether something is to happen (allow access, chroot) 760 * for a user. Each line is a shell-style glob followed by 761 * `yes' or `no'. 762 * 763 * For backward compatibility, `allow' and `deny' are synonymns 764 * for `yes' and `no', respectively. 765 * 766 * Each glob is matched against the username in turn, and the first 767 * match found is used. If no match is found, the result is the 768 * argument `def'. If a match is found but without and explicit 769 * `yes'/`no', the result is the opposite of def. 770 * 771 * If the file doesn't exist at all, the result is the argument 772 * `nofile' 773 * 774 * Any line starting with `#' is considered a comment and ignored. 775 * 776 * Returns 0 if the user is denied, or 1 if they are allowed. 777 * 778 * NOTE: needs struct passwd *pw setup before use. 779 */ 780 static int 781 checkuser(const char *fname, const char *name, int def, int nofile, 782 char **retclass) 783 { 784 FILE *fd; 785 int retval; 786 char *word, *perm, *class, *buf, *p; 787 size_t len, line; 788 789 retval = def; 790 if (retclass != NULL) 791 *retclass = NULL; 792 if ((fd = fopen(conffilename(fname), "r")) == NULL) 793 return nofile; 794 795 line = 0; 796 for (; 797 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 798 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 799 free(buf), buf = NULL) { 800 word = perm = class = NULL; 801 p = buf; 802 if (len < 1) 803 continue; 804 if (p[len - 1] == '\n') 805 p[--len] = '\0'; 806 if (EMPTYSTR(p)) 807 continue; 808 809 NEXTWORD(p, word); 810 NEXTWORD(p, perm); 811 NEXTWORD(p, class); 812 if (EMPTYSTR(word)) 813 continue; 814 if (!EMPTYSTR(class)) { 815 if (strcasecmp(class, "all") == 0 || 816 strcasecmp(class, "none") == 0) { 817 syslog(LOG_WARNING, 818 "%s line %d: illegal user-defined class `%s' - skipping entry", 819 fname, (int)line, class); 820 continue; 821 } 822 } 823 824 /* have a host specifier */ 825 if ((p = strchr(word, '@')) != NULL) { 826 unsigned long net, mask, addr; 827 int bits; 828 829 *p++ = '\0'; 830 /* check against network or CIDR */ 831 if (isdigit(*p) && 832 (bits = inet_net_pton(AF_INET, p, 833 &net, sizeof(net))) != -1) { 834 net = ntohl(net); 835 mask = 0xffffffffU << (32 - bits); 836 addr = ntohl(his_addr.su_addr.s_addr); 837 if ((addr & mask) != net) 838 continue; 839 840 /* check against hostname glob */ 841 } else if (fnmatch(p, remotehost, FNM_CASEFOLD) != 0) 842 continue; 843 } 844 845 /* have a group specifier */ 846 if ((p = strchr(word, ':')) != NULL) { 847 gid_t *groups, *ng; 848 int gsize, i, found; 849 850 if (pw == NULL) 851 continue; /* no match for unknown user */ 852 *p++ = '\0'; 853 groups = NULL; 854 gsize = 16; 855 do { 856 ng = realloc(groups, gsize * sizeof(gid_t)); 857 if (ng == NULL) 858 fatal( 859 "Local resource failure: realloc"); 860 groups = ng; 861 } while (getgrouplist(pw->pw_name, pw->pw_gid, 862 groups, &gsize) == -1); 863 found = 0; 864 for (i = 0; i < gsize; i++) { 865 struct group *g; 866 867 if ((g = getgrgid(groups[i])) == NULL) 868 continue; 869 if (fnmatch(p, g->gr_name, 0) == 0) { 870 found = 1; 871 break; 872 } 873 } 874 free(groups); 875 if (!found) 876 continue; 877 } 878 879 /* check against username glob */ 880 if (fnmatch(word, name, 0) != 0) 881 continue; 882 883 if (perm != NULL && 884 ((strcasecmp(perm, "allow") == 0) || 885 (strcasecmp(perm, "yes") == 0))) 886 retval = 1; 887 else if (perm != NULL && 888 ((strcasecmp(perm, "deny") == 0) || 889 (strcasecmp(perm, "no") == 0))) 890 retval = 0; 891 else 892 retval = !def; 893 if (!EMPTYSTR(class) && retclass != NULL) 894 *retclass = xstrdup(class); 895 free(buf); 896 break; 897 } 898 (void) fclose(fd); 899 return (retval); 900 } 901 902 /* 903 * Check if user is allowed by /etc/ftpusers 904 * returns 1 for yes, 0 for no 905 * 906 * NOTE: needs struct passwd *pw setup (for checkuser()) 907 */ 908 static int 909 checkaccess(const char *name) 910 { 911 912 return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL)); 913 } 914 915 static void 916 login_utmp(const char *line, const char *name, const char *host) 917 { 918 #if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP) 919 struct timeval tv; 920 (void)gettimeofday(&tv, NULL); 921 #endif 922 #ifdef SUPPORT_UTMPX 923 if (doutmp) { 924 (void)memset(&utmpx, 0, sizeof(utmpx)); 925 utmpx.ut_tv = tv; 926 utmpx.ut_pid = getpid(); 927 utmpx.ut_id[0] = 'f'; 928 utmpx.ut_id[1] = 't'; 929 utmpx.ut_id[2] = 'p'; 930 utmpx.ut_id[3] = '*'; 931 utmpx.ut_type = USER_PROCESS; 932 (void)strncpy(utmpx.ut_name, name, sizeof(utmpx.ut_name)); 933 (void)strncpy(utmpx.ut_line, line, sizeof(utmpx.ut_line)); 934 (void)strncpy(utmpx.ut_host, host, sizeof(utmpx.ut_host)); 935 loginx(&utmpx); 936 } 937 if (dowtmp) 938 logwtmpx(line, name, host, 0, USER_PROCESS); 939 #endif 940 #ifdef SUPPORT_UTMP 941 if (doutmp) { 942 (void)memset(&utmp, 0, sizeof(utmp)); 943 (void)time(&utmp.ut_time); 944 (void)strncpy(utmp.ut_name, name, sizeof(utmp.ut_name)); 945 (void)strncpy(utmp.ut_line, line, sizeof(utmp.ut_line)); 946 (void)strncpy(utmp.ut_host, host, sizeof(utmp.ut_host)); 947 login(&utmp); 948 } 949 if (dowtmp) 950 logwtmp(line, name, host); 951 #endif 952 } 953 954 static void 955 logout_utmp(void) 956 { 957 int okwtmp = dowtmp; 958 if (logged_in) { 959 if (doutmp) { 960 #ifdef SUPPORT_UTMPX 961 okwtmp = logoutx(ttyline, 0, DEAD_PROCESS) & dowtmp; 962 #endif 963 #ifdef SUPPORT_UTMP 964 okwtmp = logout(ttyline) & dowtmp; 965 #endif 966 } 967 if (okwtmp) { 968 #ifdef SUPPORT_UTMPX 969 logwtmpx(ttyline, "", "", 0, DEAD_PROCESS); 970 #endif 971 #ifdef SUPPORT_UTMP 972 logwtmp(ttyline, "", ""); 973 #endif 974 } 975 } 976 } 977 978 /* 979 * Terminate login as previous user (if any), resetting state; 980 * used when USER command is given or login fails. 981 */ 982 static void 983 end_login(void) 984 { 985 logout_utmp(); 986 show_chdir_messages(-1); /* flush chdir cache */ 987 if (pw != NULL && pw->pw_passwd != NULL) 988 memset(pw->pw_passwd, 0, strlen(pw->pw_passwd)); 989 pw = NULL; 990 logged_in = 0; 991 askpasswd = 0; 992 permitted = 0; 993 quietmessages = 0; 994 gidcount = 0; 995 curclass.type = CLASS_REAL; 996 (void) seteuid((uid_t)0); 997 } 998 999 void 1000 pass(const char *passwd) 1001 { 1002 int rval; 1003 char root[MAXPATHLEN]; 1004 1005 if (logged_in || askpasswd == 0) { 1006 reply(503, "Login with USER first."); 1007 return; 1008 } 1009 askpasswd = 0; 1010 if (curclass.type != CLASS_GUEST) { 1011 /* "ftp" is the only account allowed with no password */ 1012 if (pw == NULL) { 1013 rval = 1; /* failure below */ 1014 goto skip; 1015 } 1016 #if defined(KERBEROS) 1017 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 1018 rval = 0; 1019 goto skip; 1020 } 1021 #endif 1022 #if defined(KERBEROS5) 1023 if (k5login(pw, "", hostname, (char *)passwd) == 0) { 1024 rval = 0; 1025 goto skip; 1026 } 1027 #endif 1028 #ifdef SKEY 1029 if (skey_haskey(pw->pw_name) == 0) { 1030 char *p; 1031 int r; 1032 1033 p = xstrdup(passwd); 1034 r = skey_passcheck(pw->pw_name, p); 1035 free(p); 1036 if (r != -1) { 1037 rval = 0; 1038 goto skip; 1039 } 1040 } 1041 #endif 1042 if (!sflag) 1043 rval = checkpassword(pw, passwd); 1044 else 1045 rval = 1; 1046 1047 skip: 1048 1049 /* 1050 * If rval > 0, the user failed the authentication check 1051 * above. If rval == 0, either Kerberos or local 1052 * authentication succeeded. 1053 */ 1054 if (rval) { 1055 reply(530, "%s", rval == 2 ? "Password expired." : 1056 "Login incorrect."); 1057 if (logging) { 1058 syslog(LOG_NOTICE, 1059 "FTP LOGIN FAILED FROM %s", remotehost); 1060 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1061 "FTP LOGIN FAILED FROM %s, %s", 1062 remotehost, curname); 1063 } 1064 pw = NULL; 1065 if (login_attempts++ >= 5) { 1066 syslog(LOG_NOTICE, 1067 "repeated login failures from %s", 1068 remotehost); 1069 exit(0); 1070 } 1071 return; 1072 } 1073 } 1074 1075 /* password ok; check if anything else prevents login */ 1076 if (! permitted) { 1077 reply(530, "User %s may not use FTP.", pw->pw_name); 1078 if (logging) 1079 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 1080 remotehost, pw->pw_name); 1081 goto bad; 1082 } 1083 1084 login_attempts = 0; /* this time successful */ 1085 if (setegid((gid_t)pw->pw_gid) < 0) { 1086 reply(550, "Can't set gid."); 1087 goto bad; 1088 } 1089 (void) initgroups(pw->pw_name, pw->pw_gid); 1090 /* cache groups for cmds.c::matchgroup() */ 1091 gidcount = getgroups(sizeof(gidlist), gidlist); 1092 1093 /* open utmp/wtmp before chroot */ 1094 login_utmp(ttyline, pw->pw_name, remotehost); 1095 1096 logged_in = 1; 1097 1098 connections = 1; 1099 if (dopidfile) 1100 count_users(); 1101 if (curclass.limit != -1 && connections > curclass.limit) { 1102 if (! EMPTYSTR(curclass.limitfile)) 1103 (void)display_file(conffilename(curclass.limitfile), 1104 530); 1105 reply(530, 1106 "User %s access denied, connection limit of %d reached.", 1107 pw->pw_name, curclass.limit); 1108 syslog(LOG_NOTICE, 1109 "Maximum connection limit of %d for class %s reached, login refused for %s", 1110 curclass.limit, curclass.classname, pw->pw_name); 1111 goto bad; 1112 } 1113 1114 homedir[0] = '/'; 1115 switch (curclass.type) { 1116 case CLASS_GUEST: 1117 /* 1118 * We MUST do a chdir() after the chroot. Otherwise 1119 * the old current directory will be accessible as "." 1120 * outside the new root! 1121 */ 1122 format_path(root, 1123 curclass.chroot ? curclass.chroot : 1124 anondir ? anondir : 1125 pw->pw_dir); 1126 format_path(homedir, 1127 curclass.homedir ? curclass.homedir : 1128 "/"); 1129 if (EMPTYSTR(homedir)) 1130 homedir[0] = '/'; 1131 if (EMPTYSTR(root) || chroot(root) < 0) { 1132 syslog(LOG_NOTICE, 1133 "GUEST user %s: can't chroot to %s: %m", 1134 pw->pw_name, root); 1135 goto bad_guest; 1136 } 1137 if (chdir(homedir) < 0) { 1138 syslog(LOG_NOTICE, 1139 "GUEST user %s: can't chdir to %s: %m", 1140 pw->pw_name, homedir); 1141 bad_guest: 1142 reply(550, "Can't set guest privileges."); 1143 goto bad; 1144 } 1145 break; 1146 case CLASS_CHROOT: 1147 format_path(root, 1148 curclass.chroot ? curclass.chroot : 1149 pw->pw_dir); 1150 format_path(homedir, 1151 curclass.homedir ? curclass.homedir : 1152 "/"); 1153 if (EMPTYSTR(homedir)) 1154 homedir[0] = '/'; 1155 if (EMPTYSTR(root) || chroot(root) < 0) { 1156 syslog(LOG_NOTICE, 1157 "CHROOT user %s: can't chroot to %s: %m", 1158 pw->pw_name, root); 1159 goto bad_chroot; 1160 } 1161 if (chdir(homedir) < 0) { 1162 syslog(LOG_NOTICE, 1163 "CHROOT user %s: can't chdir to %s: %m", 1164 pw->pw_name, homedir); 1165 bad_chroot: 1166 reply(550, "Can't change root."); 1167 goto bad; 1168 } 1169 break; 1170 case CLASS_REAL: 1171 /* only chroot REAL if explictly requested */ 1172 if (! EMPTYSTR(curclass.chroot)) { 1173 format_path(root, curclass.chroot); 1174 if (EMPTYSTR(root) || chroot(root) < 0) { 1175 syslog(LOG_NOTICE, 1176 "REAL user %s: can't chroot to %s: %m", 1177 pw->pw_name, root); 1178 goto bad_chroot; 1179 } 1180 } 1181 format_path(homedir, 1182 curclass.homedir ? curclass.homedir : 1183 pw->pw_dir); 1184 if (EMPTYSTR(homedir) || chdir(homedir) < 0) { 1185 if (chdir("/") < 0) { 1186 syslog(LOG_NOTICE, 1187 "REAL user %s: can't chdir to %s: %m", 1188 pw->pw_name, 1189 !EMPTYSTR(homedir) ? homedir : "/"); 1190 reply(530, 1191 "User %s: can't change directory to %s.", 1192 pw->pw_name, 1193 !EMPTYSTR(homedir) ? homedir : "/"); 1194 goto bad; 1195 } else { 1196 reply(-230, 1197 "No directory! Logging in with home=/"); 1198 homedir[0] = '/'; 1199 } 1200 } 1201 break; 1202 } 1203 setlogin(pw->pw_name); 1204 if (dropprivs || 1205 (curclass.type != CLASS_REAL && 1206 ntohs(ctrl_addr.su_port) > IPPORT_RESERVED + 1)) { 1207 dropprivs++; 1208 if (setgid((gid_t)pw->pw_gid) < 0) { 1209 reply(550, "Can't set gid."); 1210 goto bad; 1211 } 1212 if (setuid((uid_t)pw->pw_uid) < 0) { 1213 reply(550, "Can't set uid."); 1214 goto bad; 1215 } 1216 } else { 1217 if (seteuid((uid_t)pw->pw_uid) < 0) { 1218 reply(550, "Can't set uid."); 1219 goto bad; 1220 } 1221 } 1222 setenv("HOME", homedir, 1); 1223 1224 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 1225 quietmessages = 1; 1226 1227 /* 1228 * Display a login message, if it exists. 1229 * N.B. reply(230,) must follow the message. 1230 */ 1231 if (! EMPTYSTR(curclass.motd)) 1232 (void)display_file(conffilename(curclass.motd), 230); 1233 show_chdir_messages(230); 1234 if (curclass.type == CLASS_GUEST) { 1235 char *p; 1236 1237 reply(230, "Guest login ok, access restrictions apply."); 1238 #if HAVE_SETPROCTITLE 1239 snprintf(proctitle, sizeof(proctitle), 1240 "%s: anonymous/%s", remotehost, passwd); 1241 setproctitle("%s", proctitle); 1242 #endif /* HAVE_SETPROCTITLE */ 1243 if (logging) 1244 syslog(LOG_INFO, 1245 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 1246 remotehost, passwd, 1247 curclass.classname, CURCLASSTYPE); 1248 /* store guest password reply into pw_passwd */ 1249 REASSIGN(pw->pw_passwd, xstrdup(passwd)); 1250 for (p = pw->pw_passwd; *p; p++) 1251 if (!isgraph(*p)) 1252 *p = '_'; 1253 } else { 1254 reply(230, "User %s logged in.", pw->pw_name); 1255 #if HAVE_SETPROCTITLE 1256 snprintf(proctitle, sizeof(proctitle), 1257 "%s: %s", remotehost, pw->pw_name); 1258 setproctitle("%s", proctitle); 1259 #endif /* HAVE_SETPROCTITLE */ 1260 if (logging) 1261 syslog(LOG_INFO, 1262 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1263 remotehost, pw->pw_name, 1264 curclass.classname, CURCLASSTYPE); 1265 } 1266 (void) umask(curclass.umask); 1267 return; 1268 1269 bad: 1270 /* Forget all about it... */ 1271 end_login(); 1272 } 1273 1274 void 1275 retrieve(char *argv[], const char *name) 1276 { 1277 FILE *fin, *dout; 1278 struct stat st; 1279 int (*closefunc)(FILE *) = NULL; 1280 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1281 struct timeval start, finish, td, *tdp; 1282 struct rusage rusage_before, rusage_after; 1283 const char *dispname; 1284 char *error; 1285 1286 sendrv = closerv = stderrfd = -1; 1287 isconversion = isdata = isls = log = 0; 1288 tdp = NULL; 1289 dispname = name; 1290 fin = dout = NULL; 1291 error = NULL; 1292 if (argv == NULL) { /* if not running a command ... */ 1293 log = 1; 1294 isdata = 1; 1295 fin = fopen(name, "r"); 1296 closefunc = fclose; 1297 if (fin == NULL) /* doesn't exist?; try a conversion */ 1298 argv = do_conversion(name); 1299 if (argv != NULL) { 1300 isconversion++; 1301 syslog(LOG_DEBUG, "get command: '%s' on '%s'", 1302 argv[0], name); 1303 } 1304 } 1305 if (argv != NULL) { 1306 char temp[MAXPATHLEN]; 1307 1308 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1309 isls = 1; 1310 stderrfd = -1; 1311 } else { 1312 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1313 stderrfd = mkstemp(temp); 1314 if (stderrfd != -1) 1315 (void)unlink(temp); 1316 } 1317 dispname = argv[0]; 1318 fin = ftpd_popen(argv, "r", stderrfd); 1319 closefunc = ftpd_pclose; 1320 st.st_size = -1; 1321 st.st_blksize = BUFSIZ; 1322 } 1323 if (fin == NULL) { 1324 if (errno != 0) { 1325 perror_reply(550, dispname); 1326 if (log) 1327 logxfer("get", -1, name, NULL, NULL, 1328 strerror(errno)); 1329 } 1330 goto cleanupretrieve; 1331 } 1332 byte_count = -1; 1333 if (argv == NULL 1334 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1335 error = "Not a plain file"; 1336 reply(550, "%s: %s.", dispname, error); 1337 goto done; 1338 } 1339 if (restart_point) { 1340 if (type == TYPE_A) { 1341 off_t i; 1342 int c; 1343 1344 for (i = 0; i < restart_point; i++) { 1345 if ((c=getc(fin)) == EOF) { 1346 error = strerror(errno); 1347 perror_reply(550, dispname); 1348 goto done; 1349 } 1350 if (c == '\n') 1351 i++; 1352 } 1353 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1354 error = strerror(errno); 1355 perror_reply(550, dispname); 1356 goto done; 1357 } 1358 } 1359 dout = dataconn(dispname, st.st_size, "w"); 1360 if (dout == NULL) 1361 goto done; 1362 1363 (void)getrusage(RUSAGE_SELF, &rusage_before); 1364 (void)gettimeofday(&start, NULL); 1365 sendrv = send_data(fin, dout, &st, isdata); 1366 (void)gettimeofday(&finish, NULL); 1367 (void)getrusage(RUSAGE_SELF, &rusage_after); 1368 closedataconn(dout); /* close now to affect timing stats */ 1369 timersub(&finish, &start, &td); 1370 tdp = &td; 1371 done: 1372 if (log) { 1373 logxfer("get", byte_count, name, NULL, tdp, error); 1374 if (tdp != NULL) 1375 logrusage(&rusage_before, &rusage_after); 1376 } 1377 closerv = (*closefunc)(fin); 1378 if (sendrv == 0) { 1379 FILE *errf; 1380 struct stat sb; 1381 1382 if (!isls && argv != NULL && closerv != 0) { 1383 reply(-226, 1384 "Command returned an exit status of %d", 1385 closerv); 1386 if (isconversion) 1387 syslog(LOG_WARNING, 1388 "retrieve command: '%s' returned %d", 1389 argv[0], closerv); 1390 } 1391 if (!isls && argv != NULL && stderrfd != -1 && 1392 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1393 ((errf = fdopen(stderrfd, "r")) != NULL)) { 1394 char *cp, line[LINE_MAX]; 1395 1396 reply(-226, "Command error messages:"); 1397 rewind(errf); 1398 while (fgets(line, sizeof(line), errf) != NULL) { 1399 if ((cp = strchr(line, '\n')) != NULL) 1400 *cp = '\0'; 1401 reply(0, " %s", line); 1402 } 1403 (void) fflush(stdout); 1404 (void) fclose(errf); 1405 /* a reply(226,) must follow */ 1406 } 1407 reply(226, "Transfer complete."); 1408 } 1409 cleanupretrieve: 1410 if (stderrfd != -1) 1411 (void)close(stderrfd); 1412 if (isconversion) 1413 free(argv); 1414 } 1415 1416 void 1417 store(const char *name, const char *fmode, int unique) 1418 { 1419 FILE *fout, *din; 1420 struct stat st; 1421 int (*closefunc)(FILE *); 1422 struct timeval start, finish, td, *tdp; 1423 char *desc, *error; 1424 1425 din = NULL; 1426 desc = (*fmode == 'w') ? "put" : "append"; 1427 error = NULL; 1428 if (unique && stat(name, &st) == 0 && 1429 (name = gunique(name)) == NULL) { 1430 logxfer(desc, -1, name, NULL, NULL, 1431 "cannot create unique file"); 1432 goto cleanupstore; 1433 } 1434 1435 if (restart_point) 1436 fmode = "r+"; 1437 fout = fopen(name, fmode); 1438 closefunc = fclose; 1439 tdp = NULL; 1440 if (fout == NULL) { 1441 perror_reply(553, name); 1442 logxfer(desc, -1, name, NULL, NULL, strerror(errno)); 1443 goto cleanupstore; 1444 } 1445 byte_count = -1; 1446 if (restart_point) { 1447 if (type == TYPE_A) { 1448 off_t i; 1449 int c; 1450 1451 for (i = 0; i < restart_point; i++) { 1452 if ((c=getc(fout)) == EOF) { 1453 error = strerror(errno); 1454 perror_reply(550, name); 1455 goto done; 1456 } 1457 if (c == '\n') 1458 i++; 1459 } 1460 /* 1461 * We must do this seek to "current" position 1462 * because we are changing from reading to 1463 * writing. 1464 */ 1465 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1466 error = strerror(errno); 1467 perror_reply(550, name); 1468 goto done; 1469 } 1470 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1471 error = strerror(errno); 1472 perror_reply(550, name); 1473 goto done; 1474 } 1475 } 1476 din = dataconn(name, (off_t)-1, "r"); 1477 if (din == NULL) 1478 goto done; 1479 (void)gettimeofday(&start, NULL); 1480 if (receive_data(din, fout) == 0) { 1481 if (unique) 1482 reply(226, "Transfer complete (unique file name:%s).", 1483 name); 1484 else 1485 reply(226, "Transfer complete."); 1486 } 1487 (void)gettimeofday(&finish, NULL); 1488 closedataconn(din); /* close now to affect timing stats */ 1489 timersub(&finish, &start, &td); 1490 tdp = &td; 1491 done: 1492 logxfer(desc, byte_count, name, NULL, tdp, error); 1493 (*closefunc)(fout); 1494 cleanupstore: 1495 ; 1496 } 1497 1498 static FILE * 1499 getdatasock(const char *fmode) 1500 { 1501 int on, s, t, tries; 1502 in_port_t port; 1503 1504 on = 1; 1505 if (data >= 0) 1506 return (fdopen(data, fmode)); 1507 if (! dropprivs) 1508 (void) seteuid((uid_t)0); 1509 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1510 if (s < 0) 1511 goto bad; 1512 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1513 (char *) &on, sizeof(on)) < 0) 1514 goto bad; 1515 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1516 (char *) &on, sizeof(on)) < 0) 1517 goto bad; 1518 /* anchor socket to avoid multi-homing problems */ 1519 data_source = ctrl_addr; 1520 /* 1521 * By default source port for PORT connctions is 1522 * ctrlport-1 (see RFC959 section 5.2). 1523 * However, if privs have been dropped and that 1524 * would be < IPPORT_RESERVED, use a random port 1525 * instead. 1526 */ 1527 if (dataport) 1528 port = dataport; 1529 else 1530 port = ntohs(ctrl_addr.su_port) - 1; 1531 if (dropprivs && port < IPPORT_RESERVED) 1532 port = 0; /* use random port */ 1533 data_source.su_port = htons(port); 1534 1535 for (tries = 1; ; tries++) { 1536 if (bind(s, (struct sockaddr *)&data_source.si_su, 1537 data_source.su_len) >= 0) 1538 break; 1539 if (errno != EADDRINUSE || tries > 10) 1540 goto bad; 1541 sleep(tries); 1542 } 1543 if (! dropprivs) 1544 (void) seteuid((uid_t)pw->pw_uid); 1545 #ifdef IP_TOS 1546 if (!mapped && ctrl_addr.su_family == AF_INET) { 1547 on = IPTOS_THROUGHPUT; 1548 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1549 sizeof(int)) < 0) 1550 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1551 } 1552 #endif 1553 return (fdopen(s, fmode)); 1554 bad: 1555 /* Return the real value of errno (close may change it) */ 1556 t = errno; 1557 if (! dropprivs) 1558 (void) seteuid((uid_t)pw->pw_uid); 1559 (void) close(s); 1560 errno = t; 1561 return (NULL); 1562 } 1563 1564 FILE * 1565 dataconn(const char *name, off_t size, const char *fmode) 1566 { 1567 char sizebuf[32]; 1568 FILE *file; 1569 int retry = 0, tos, keepalive; 1570 1571 file_size = size; 1572 byte_count = 0; 1573 if (size != (off_t) -1) 1574 (void)snprintf(sizebuf, sizeof(sizebuf), " (" LLF " byte%s)", 1575 (LLT)size, PLURAL(size)); 1576 else 1577 sizebuf[0] = '\0'; 1578 if (pdata >= 0) { 1579 struct sockinet from; 1580 int s, fromlen = sizeof(from.su_len); 1581 1582 (void) alarm(curclass.timeout); 1583 s = accept(pdata, (struct sockaddr *)&from.si_su, &fromlen); 1584 (void) alarm(0); 1585 if (s < 0) { 1586 reply(425, "Can't open data connection."); 1587 (void) close(pdata); 1588 pdata = -1; 1589 return (NULL); 1590 } 1591 (void) close(pdata); 1592 pdata = s; 1593 switch (from.su_family) { 1594 case AF_INET: 1595 #ifdef IP_TOS 1596 if (!mapped) { 1597 tos = IPTOS_THROUGHPUT; 1598 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1599 (char *)&tos, sizeof(int)); 1600 } 1601 break; 1602 #endif 1603 } 1604 /* Set keepalives on the socket to detect dropped conns. */ 1605 #ifdef SO_KEEPALIVE 1606 keepalive = 1; 1607 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1608 (char *)&keepalive, sizeof(int)); 1609 #endif 1610 reply(150, "Opening %s mode data connection for '%s'%s.", 1611 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1612 return (fdopen(pdata, fmode)); 1613 } 1614 if (data >= 0) { 1615 reply(125, "Using existing data connection for '%s'%s.", 1616 name, sizebuf); 1617 usedefault = 1; 1618 return (fdopen(data, fmode)); 1619 } 1620 if (usedefault) 1621 data_dest = his_addr; 1622 usedefault = 1; 1623 file = getdatasock(fmode); 1624 if (file == NULL) { 1625 char hbuf[NI_MAXHOST]; 1626 char pbuf[NI_MAXSERV]; 1627 1628 if (getnameinfo((struct sockaddr *)&data_source.si_su, 1629 data_source.su_len, hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1630 NI_NUMERICHOST | NI_NUMERICSERV)) 1631 strlcpy(hbuf, "?", sizeof(hbuf)); 1632 reply(425, "Can't create data socket (%s,%s): %s.", 1633 hbuf, pbuf, strerror(errno)); 1634 return (NULL); 1635 } 1636 data = fileno(file); 1637 while (connect(data, (struct sockaddr *)&data_dest.si_su, 1638 data_dest.su_len) < 0) { 1639 if (errno == EADDRINUSE && retry < swaitmax) { 1640 sleep((unsigned) swaitint); 1641 retry += swaitint; 1642 continue; 1643 } 1644 perror_reply(425, "Can't build data connection"); 1645 (void) fclose(file); 1646 data = -1; 1647 return (NULL); 1648 } 1649 reply(150, "Opening %s mode data connection for '%s'%s.", 1650 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1651 return (file); 1652 } 1653 1654 void 1655 closedataconn(FILE *fd) 1656 { 1657 1658 if (fd == NULL) 1659 return; 1660 (void)fclose(fd); 1661 data = -1; 1662 if (pdata >= 0) 1663 (void)close(pdata); 1664 pdata = -1; 1665 } 1666 1667 int 1668 write_data(int fd, char *buf, size_t size, off_t *bufrem, 1669 struct timeval *then, int isdata) 1670 { 1671 struct timeval now, td; 1672 ssize_t c; 1673 1674 while (size > 0) { 1675 c = size; 1676 if (curclass.writesize) { 1677 if (curclass.writesize < c) 1678 c = curclass.writesize; 1679 } 1680 if (curclass.rateget) { 1681 if (*bufrem < c) 1682 c = *bufrem; 1683 } 1684 (void) alarm(curclass.timeout); 1685 c = write(fd, buf, c); 1686 if (c <= 0) 1687 return (1); 1688 buf += c; 1689 size -= c; 1690 byte_count += c; 1691 if (isdata) { 1692 total_data_out += c; 1693 total_data += c; 1694 } 1695 total_bytes_out += c; 1696 total_bytes += c; 1697 if (curclass.rateget) { 1698 *bufrem -= c; 1699 if (*bufrem == 0) { 1700 (void)gettimeofday(&now, NULL); 1701 timersub(&now, then, &td); 1702 if (td.tv_sec == 0) { 1703 usleep(1000000 - td.tv_usec); 1704 (void)gettimeofday(then, NULL); 1705 } else 1706 *then = now; 1707 *bufrem = curclass.rateget; 1708 } 1709 } 1710 } 1711 return (0); 1712 } 1713 1714 static enum send_status 1715 send_data_with_read(int filefd, int netfd, const struct stat *st, int isdata) 1716 { 1717 struct timeval then; 1718 off_t bufrem; 1719 size_t readsize; 1720 char *buf; 1721 int c, error; 1722 1723 if (curclass.readsize) 1724 readsize = curclass.readsize; 1725 else 1726 readsize = (size_t)st->st_blksize; 1727 if ((buf = malloc(readsize)) == NULL) { 1728 perror_reply(451, "Local resource failure: malloc"); 1729 return (SS_NO_TRANSFER); 1730 } 1731 1732 if (curclass.rateget) { 1733 bufrem = curclass.rateget; 1734 (void)gettimeofday(&then, NULL); 1735 } 1736 while (1) { 1737 (void) alarm(curclass.timeout); 1738 c = read(filefd, buf, readsize); 1739 if (c == 0) 1740 error = SS_SUCCESS; 1741 else if (c < 0) 1742 error = SS_FILE_ERROR; 1743 else if (write_data(netfd, buf, c, &bufrem, &then, isdata)) 1744 error = SS_DATA_ERROR; 1745 else 1746 continue; 1747 1748 free(buf); 1749 return (error); 1750 } 1751 } 1752 1753 static enum send_status 1754 send_data_with_mmap(int filefd, int netfd, const struct stat *st, int isdata) 1755 { 1756 struct timeval then; 1757 off_t bufrem, filesize, off, origoff; 1758 size_t mapsize, winsize; 1759 int error, sendbufsize, sendlowat; 1760 void *win; 1761 1762 if (curclass.sendbufsize) { 1763 sendbufsize = curclass.sendbufsize; 1764 if (setsockopt(netfd, SOL_SOCKET, SO_SNDBUF, 1765 &sendbufsize, sizeof(int)) == -1) 1766 syslog(LOG_WARNING, "setsockopt(SO_SNDBUF, %d): %m", 1767 sendbufsize); 1768 } 1769 1770 if (curclass.sendlowat) { 1771 sendlowat = curclass.sendlowat; 1772 if (setsockopt(netfd, SOL_SOCKET, SO_SNDLOWAT, 1773 &sendlowat, sizeof(int)) == -1) 1774 syslog(LOG_WARNING, "setsockopt(SO_SNDLOWAT, %d): %m", 1775 sendlowat); 1776 } 1777 1778 winsize = curclass.mmapsize; 1779 filesize = st->st_size; 1780 if (debug) 1781 syslog(LOG_INFO, "mmapsize = %ld, writesize = %ld", 1782 (long)winsize, (long)curclass.writesize); 1783 if (winsize == 0) 1784 goto try_read; 1785 1786 off = lseek(filefd, (off_t)0, SEEK_CUR); 1787 if (off == -1) 1788 goto try_read; 1789 1790 origoff = off; 1791 if (curclass.rateget) { 1792 bufrem = curclass.rateget; 1793 (void)gettimeofday(&then, NULL); 1794 } 1795 while (1) { 1796 mapsize = MIN(filesize - off, winsize); 1797 if (mapsize == 0) 1798 break; 1799 win = mmap(NULL, mapsize, PROT_READ, 1800 MAP_FILE|MAP_SHARED, filefd, off); 1801 if (win == MAP_FAILED) { 1802 if (off == origoff) 1803 goto try_read; 1804 return (SS_FILE_ERROR); 1805 } 1806 (void) madvise(win, mapsize, MADV_SEQUENTIAL); 1807 error = write_data(netfd, win, mapsize, &bufrem, &then, 1808 isdata); 1809 (void) madvise(win, mapsize, MADV_DONTNEED); 1810 munmap(win, mapsize); 1811 if (error) 1812 return (SS_DATA_ERROR); 1813 off += mapsize; 1814 } 1815 return (SS_SUCCESS); 1816 1817 try_read: 1818 return (send_data_with_read(filefd, netfd, st, isdata)); 1819 } 1820 1821 /* 1822 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1823 * encapsulation of the data subject to Mode, Structure, and Type. 1824 * 1825 * NB: Form isn't handled. 1826 */ 1827 static int 1828 send_data(FILE *instr, FILE *outstr, const struct stat *st, int isdata) 1829 { 1830 int c, filefd, netfd, rval; 1831 1832 transflag = 1; 1833 rval = -1; 1834 if (setjmp(urgcatch)) 1835 goto cleanup_send_data; 1836 1837 switch (type) { 1838 1839 case TYPE_A: 1840 /* XXXLUKEM: rate limit ascii send (get) */ 1841 (void) alarm(curclass.timeout); 1842 while ((c = getc(instr)) != EOF) { 1843 byte_count++; 1844 if (c == '\n') { 1845 if (ferror(outstr)) 1846 goto data_err; 1847 (void) putc('\r', outstr); 1848 if (isdata) { 1849 total_data_out++; 1850 total_data++; 1851 } 1852 total_bytes_out++; 1853 total_bytes++; 1854 } 1855 (void) putc(c, outstr); 1856 if (isdata) { 1857 total_data_out++; 1858 total_data++; 1859 } 1860 total_bytes_out++; 1861 total_bytes++; 1862 if ((byte_count % 4096) == 0) 1863 (void) alarm(curclass.timeout); 1864 } 1865 (void) alarm(0); 1866 fflush(outstr); 1867 if (ferror(instr)) 1868 goto file_err; 1869 if (ferror(outstr)) 1870 goto data_err; 1871 rval = 0; 1872 goto cleanup_send_data; 1873 1874 case TYPE_I: 1875 case TYPE_L: 1876 filefd = fileno(instr); 1877 netfd = fileno(outstr); 1878 switch (send_data_with_mmap(filefd, netfd, st, isdata)) { 1879 1880 case SS_SUCCESS: 1881 break; 1882 1883 case SS_NO_TRANSFER: 1884 goto cleanup_send_data; 1885 1886 case SS_FILE_ERROR: 1887 goto file_err; 1888 1889 case SS_DATA_ERROR: 1890 goto data_err; 1891 } 1892 rval = 0; 1893 goto cleanup_send_data; 1894 1895 default: 1896 reply(550, "Unimplemented TYPE %d in send_data", type); 1897 goto cleanup_send_data; 1898 } 1899 1900 data_err: 1901 (void) alarm(0); 1902 perror_reply(426, "Data connection"); 1903 goto cleanup_send_data; 1904 1905 file_err: 1906 (void) alarm(0); 1907 perror_reply(551, "Error on input file"); 1908 /* FALLTHROUGH */ 1909 1910 cleanup_send_data: 1911 (void) alarm(0); 1912 transflag = 0; 1913 if (isdata) { 1914 total_files_out++; 1915 total_files++; 1916 } 1917 total_xfers_out++; 1918 total_xfers++; 1919 return (rval); 1920 } 1921 1922 /* 1923 * Transfer data from peer to "outstr" using the appropriate encapulation of 1924 * the data subject to Mode, Structure, and Type. 1925 * 1926 * N.B.: Form isn't handled. 1927 */ 1928 static int 1929 receive_data(FILE *instr, FILE *outstr) 1930 { 1931 int c, bare_lfs, netfd, filefd, rval; 1932 off_t byteswritten; 1933 char buf[BUFSIZ]; 1934 #ifdef __GNUC__ 1935 (void) &bare_lfs; 1936 #endif 1937 1938 bare_lfs = 0; 1939 transflag = 1; 1940 rval = -1; 1941 byteswritten = 0; 1942 if (setjmp(urgcatch)) 1943 goto cleanup_recv_data; 1944 1945 #define FILESIZECHECK(x) \ 1946 do { \ 1947 if (curclass.maxfilesize != -1 && \ 1948 (x) > curclass.maxfilesize) { \ 1949 errno = EFBIG; \ 1950 goto file_err; \ 1951 } \ 1952 } while (0) 1953 1954 switch (type) { 1955 1956 case TYPE_I: 1957 case TYPE_L: 1958 netfd = fileno(instr); 1959 filefd = fileno(outstr); 1960 (void) alarm(curclass.timeout); 1961 if (curclass.rateput) { 1962 while (1) { 1963 int d; 1964 struct timeval then, now, td; 1965 off_t bufrem; 1966 1967 (void)gettimeofday(&then, NULL); 1968 errno = c = d = 0; 1969 for (bufrem = curclass.rateput; bufrem > 0; ) { 1970 if ((c = read(netfd, buf, 1971 MIN(sizeof(buf), bufrem))) <= 0) 1972 goto recvdone; 1973 FILESIZECHECK(byte_count + c); 1974 if ((d = write(filefd, buf, c)) != c) 1975 goto file_err; 1976 (void) alarm(curclass.timeout); 1977 bufrem -= c; 1978 byte_count += c; 1979 total_data_in += c; 1980 total_data += c; 1981 total_bytes_in += c; 1982 total_bytes += c; 1983 } 1984 (void)gettimeofday(&now, NULL); 1985 timersub(&now, &then, &td); 1986 if (td.tv_sec == 0) 1987 usleep(1000000 - td.tv_usec); 1988 } 1989 } else { 1990 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1991 FILESIZECHECK(byte_count + c); 1992 if (write(filefd, buf, c) != c) 1993 goto file_err; 1994 (void) alarm(curclass.timeout); 1995 byte_count += c; 1996 total_data_in += c; 1997 total_data += c; 1998 total_bytes_in += c; 1999 total_bytes += c; 2000 } 2001 } 2002 recvdone: 2003 if (c < 0) 2004 goto data_err; 2005 rval = 0; 2006 goto cleanup_recv_data; 2007 2008 case TYPE_E: 2009 reply(553, "TYPE E not implemented."); 2010 goto cleanup_recv_data; 2011 2012 case TYPE_A: 2013 (void) alarm(curclass.timeout); 2014 /* XXXLUKEM: rate limit ascii receive (put) */ 2015 while ((c = getc(instr)) != EOF) { 2016 byte_count++; 2017 total_data_in++; 2018 total_data++; 2019 total_bytes_in++; 2020 total_bytes++; 2021 if ((byte_count % 4096) == 0) 2022 (void) alarm(curclass.timeout); 2023 if (c == '\n') 2024 bare_lfs++; 2025 while (c == '\r') { 2026 if (ferror(outstr)) 2027 goto data_err; 2028 if ((c = getc(instr)) != '\n') { 2029 byte_count++; 2030 total_data_in++; 2031 total_data++; 2032 total_bytes_in++; 2033 total_bytes++; 2034 if ((byte_count % 4096) == 0) 2035 (void) alarm(curclass.timeout); 2036 byteswritten++; 2037 FILESIZECHECK(byteswritten); 2038 (void) putc ('\r', outstr); 2039 if (c == '\0' || c == EOF) 2040 goto contin2; 2041 } 2042 } 2043 byteswritten++; 2044 FILESIZECHECK(byteswritten); 2045 (void) putc(c, outstr); 2046 contin2: ; 2047 } 2048 (void) alarm(0); 2049 fflush(outstr); 2050 if (ferror(instr)) 2051 goto data_err; 2052 if (ferror(outstr)) 2053 goto file_err; 2054 if (bare_lfs) { 2055 reply(-226, 2056 "WARNING! %d bare linefeeds received in ASCII mode", 2057 bare_lfs); 2058 reply(0, "File may not have transferred correctly."); 2059 } 2060 rval = 0; 2061 goto cleanup_recv_data; 2062 2063 default: 2064 reply(550, "Unimplemented TYPE %d in receive_data", type); 2065 goto cleanup_recv_data; 2066 } 2067 #undef FILESIZECHECK 2068 2069 data_err: 2070 (void) alarm(0); 2071 perror_reply(426, "Data Connection"); 2072 goto cleanup_recv_data; 2073 2074 file_err: 2075 (void) alarm(0); 2076 perror_reply(452, "Error writing file"); 2077 goto cleanup_recv_data; 2078 2079 cleanup_recv_data: 2080 (void) alarm(0); 2081 transflag = 0; 2082 total_files_in++; 2083 total_files++; 2084 total_xfers_in++; 2085 total_xfers++; 2086 return (rval); 2087 } 2088 2089 void 2090 statcmd(void) 2091 { 2092 struct sockinet *su = NULL; 2093 static char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV]; 2094 u_char *a, *p; 2095 int ispassive, af; 2096 off_t otbi, otbo, otb; 2097 2098 a = p = (u_char *)NULL; 2099 2100 reply(-211, "%s FTP server status:", hostname); 2101 reply(0, "Version: %s", EMPTYSTR(version) ? "<suppressed>" : version); 2102 hbuf[0] = '\0'; 2103 if (!getnameinfo((struct sockaddr *)&his_addr.si_su, his_addr.su_len, 2104 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) 2105 && strcmp(remotehost, hbuf) != 0) 2106 reply(0, "Connected to %s (%s)", remotehost, hbuf); 2107 else 2108 reply(0, "Connected to %s", remotehost); 2109 2110 if (logged_in) { 2111 if (curclass.type == CLASS_GUEST) 2112 reply(0, "Logged in anonymously"); 2113 else 2114 reply(0, "Logged in as %s%s", pw->pw_name, 2115 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 2116 } else if (askpasswd) 2117 reply(0, "Waiting for password"); 2118 else 2119 reply(0, "Waiting for user name"); 2120 cprintf(stdout, " TYPE: %s", typenames[type]); 2121 if (type == TYPE_A || type == TYPE_E) 2122 cprintf(stdout, ", FORM: %s", formnames[form]); 2123 if (type == TYPE_L) { 2124 #if NBBY == 8 2125 cprintf(stdout, " %d", NBBY); 2126 #else 2127 /* XXX: `bytesize' needs to be defined in this case */ 2128 cprintf(stdout, " %d", bytesize); 2129 #endif 2130 } 2131 cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n", 2132 strunames[stru], modenames[mode]); 2133 ispassive = 0; 2134 if (data != -1) { 2135 reply(0, "Data connection open"); 2136 su = NULL; 2137 } else if (pdata != -1) { 2138 reply(0, "in Passive mode"); 2139 if (curclass.advertise.su_len != 0) 2140 su = &curclass.advertise; 2141 else 2142 su = &pasv_addr; 2143 ispassive = 1; 2144 goto printaddr; 2145 } else if (usedefault == 0) { 2146 if (epsvall) { 2147 reply(0, "EPSV only mode (EPSV ALL)"); 2148 goto epsvonly; 2149 } 2150 su = (struct sockinet *)&data_dest; 2151 printaddr: 2152 /* PASV/PORT */ 2153 if (su->su_family == AF_INET) { 2154 a = (u_char *) &su->su_addr; 2155 p = (u_char *) &su->su_port; 2156 #define UC(b) (((int) b) & 0xff) 2157 reply(0, "%s (%d,%d,%d,%d,%d,%d)", 2158 ispassive ? "PASV" : "PORT" , 2159 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2160 UC(p[0]), UC(p[1])); 2161 } 2162 2163 /* LPSV/LPRT */ 2164 { 2165 int alen, i; 2166 2167 alen = 0; 2168 switch (su->su_family) { 2169 case AF_INET: 2170 a = (u_char *) &su->su_addr; 2171 p = (u_char *) &su->su_port; 2172 alen = sizeof(su->su_addr); 2173 af = 4; 2174 break; 2175 #ifdef INET6 2176 case AF_INET6: 2177 a = (u_char *) &su->su_6addr; 2178 p = (u_char *) &su->su_port; 2179 alen = sizeof(su->su_6addr); 2180 af = 6; 2181 break; 2182 #endif 2183 default: 2184 af = 0; 2185 break; 2186 } 2187 if (af) { 2188 cprintf(stdout, " %s (%d,%d", 2189 ispassive ? "LPSV" : "LPRT", af, alen); 2190 for (i = 0; i < alen; i++) 2191 cprintf(stdout, ",%d", UC(a[i])); 2192 cprintf(stdout, ",%d,%d,%d)\r\n", 2193 2, UC(p[0]), UC(p[1])); 2194 #undef UC 2195 } 2196 } 2197 2198 /* EPRT/EPSV */ 2199 epsvonly: 2200 af = af2epsvproto(su->su_family); 2201 hbuf[0] = '\0'; 2202 if (af > 0) { 2203 struct sockinet tmp; 2204 2205 tmp = *su; 2206 #ifdef INET6 2207 if (tmp.su_family == AF_INET6) 2208 tmp.su_scope_id = 0; 2209 #endif 2210 if (getnameinfo((struct sockaddr *)&tmp.si_su, 2211 tmp.su_len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), 2212 NI_NUMERICHOST | NI_NUMERICSERV) == 0) 2213 reply(0, "%s (|%d|%s|%s|)", 2214 ispassive ? "EPSV" : "EPRT", 2215 af, hbuf, sbuf); 2216 } 2217 } else 2218 reply(0, "No data connection"); 2219 2220 if (logged_in) { 2221 reply(0, 2222 "Data sent: " LLF " byte%s in " LLF " file%s", 2223 (LLT)total_data_out, PLURAL(total_data_out), 2224 (LLT)total_files_out, PLURAL(total_files_out)); 2225 reply(0, 2226 "Data received: " LLF " byte%s in " LLF " file%s", 2227 (LLT)total_data_in, PLURAL(total_data_in), 2228 (LLT)total_files_in, PLURAL(total_files_in)); 2229 reply(0, 2230 "Total data: " LLF " byte%s in " LLF " file%s", 2231 (LLT)total_data, PLURAL(total_data), 2232 (LLT)total_files, PLURAL(total_files)); 2233 } 2234 otbi = total_bytes_in; 2235 otbo = total_bytes_out; 2236 otb = total_bytes; 2237 reply(0, "Traffic sent: " LLF " byte%s in " LLF " transfer%s", 2238 (LLT)otbo, PLURAL(otbo), 2239 (LLT)total_xfers_out, PLURAL(total_xfers_out)); 2240 reply(0, "Traffic received: " LLF " byte%s in " LLF " transfer%s", 2241 (LLT)otbi, PLURAL(otbi), 2242 (LLT)total_xfers_in, PLURAL(total_xfers_in)); 2243 reply(0, "Total traffic: " LLF " byte%s in " LLF " transfer%s", 2244 (LLT)otb, PLURAL(otb), 2245 (LLT)total_xfers, PLURAL(total_xfers)); 2246 2247 if (logged_in && !CURCLASS_FLAGS_ISSET(private)) { 2248 struct ftpconv *cp; 2249 2250 reply(0, "%s", ""); 2251 reply(0, "Class: %s, type: %s", 2252 curclass.classname, CURCLASSTYPE); 2253 reply(0, "Check PORT/LPRT commands: %sabled", 2254 CURCLASS_FLAGS_ISSET(checkportcmd) ? "en" : "dis"); 2255 if (! EMPTYSTR(curclass.display)) 2256 reply(0, "Display file: %s", curclass.display); 2257 if (! EMPTYSTR(curclass.notify)) 2258 reply(0, "Notify fileglob: %s", curclass.notify); 2259 reply(0, "Idle timeout: %d, maximum timeout: %d", 2260 curclass.timeout, curclass.maxtimeout); 2261 reply(0, "Current connections: %d", connections); 2262 if (curclass.limit == -1) 2263 reply(0, "Maximum connections: unlimited"); 2264 else 2265 reply(0, "Maximum connections: %d", curclass.limit); 2266 if (curclass.limitfile) 2267 reply(0, "Connection limit exceeded message file: %s", 2268 conffilename(curclass.limitfile)); 2269 if (! EMPTYSTR(curclass.chroot)) 2270 reply(0, "Chroot format: %s", curclass.chroot); 2271 reply(0, "Deny bad ftpusers(5) quickly: %sabled", 2272 CURCLASS_FLAGS_ISSET(denyquick) ? "en" : "dis"); 2273 if (! EMPTYSTR(curclass.homedir)) 2274 reply(0, "Homedir format: %s", curclass.homedir); 2275 if (curclass.maxfilesize == -1) 2276 reply(0, "Maximum file size: unlimited"); 2277 else 2278 reply(0, "Maximum file size: " LLF, 2279 (LLT)curclass.maxfilesize); 2280 if (! EMPTYSTR(curclass.motd)) 2281 reply(0, "MotD file: %s", conffilename(curclass.motd)); 2282 reply(0, 2283 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 2284 CURCLASS_FLAGS_ISSET(modify) ? "en" : "dis"); 2285 reply(0, "Upload commands (APPE, STOR, STOU): %sabled", 2286 CURCLASS_FLAGS_ISSET(upload) ? "en" : "dis"); 2287 reply(0, "Sanitize file names: %sabled", 2288 CURCLASS_FLAGS_ISSET(sanenames) ? "en" : "dis"); 2289 reply(0, "PASV/LPSV/EPSV connections: %sabled", 2290 CURCLASS_FLAGS_ISSET(passive) ? "en" : "dis"); 2291 if (curclass.advertise.su_len != 0) { 2292 char buf[50]; /* big enough for IPv6 address */ 2293 const char *bp; 2294 2295 bp = inet_ntop(curclass.advertise.su_family, 2296 (void *)&curclass.advertise.su_addr, 2297 buf, sizeof(buf)); 2298 if (bp != NULL) 2299 reply(0, "PASV advertise address: %s", bp); 2300 } 2301 if (curclass.portmin && curclass.portmax) 2302 reply(0, "PASV port range: %d - %d", 2303 curclass.portmin, curclass.portmax); 2304 if (curclass.rateget) 2305 reply(0, "Rate get limit: " LLF " bytes/sec", 2306 (LLT)curclass.rateget); 2307 else 2308 reply(0, "Rate get limit: disabled"); 2309 if (curclass.rateput) 2310 reply(0, "Rate put limit: " LLF " bytes/sec", 2311 (LLT)curclass.rateput); 2312 else 2313 reply(0, "Rate put limit: disabled"); 2314 reply(0, "Umask: %.04o", curclass.umask); 2315 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 2316 if (cp->suffix == NULL || cp->types == NULL || 2317 cp->command == NULL) 2318 continue; 2319 reply(0, "Conversion: %s [%s] disable: %s, command: %s", 2320 cp->suffix, cp->types, cp->disable, cp->command); 2321 } 2322 } 2323 2324 reply(211, "End of status"); 2325 } 2326 2327 void 2328 fatal(const char *s) 2329 { 2330 2331 reply(451, "Error in server: %s\n", s); 2332 reply(221, "Closing connection due to server error."); 2333 dologout(0); 2334 /* NOTREACHED */ 2335 } 2336 2337 /* 2338 * reply() -- 2339 * depending on the value of n, display fmt with a trailing CRLF and 2340 * prefix of: 2341 * n < -1 prefix the message with abs(n) + "-" (initial line) 2342 * n == 0 prefix the message with 4 spaces (middle lines) 2343 * n > 0 prefix the message with n + " " (final line) 2344 */ 2345 void 2346 reply(int n, const char *fmt, ...) 2347 { 2348 off_t b; 2349 va_list ap; 2350 2351 va_start(ap, fmt); 2352 b = 0; 2353 if (n == 0) 2354 cprintf(stdout, " "); 2355 else if (n < 0) 2356 cprintf(stdout, "%d-", -n); 2357 else 2358 cprintf(stdout, "%d ", n); 2359 b = vprintf(fmt, ap); 2360 va_end(ap); 2361 total_bytes += b; 2362 total_bytes_out += b; 2363 cprintf(stdout, "\r\n"); 2364 (void)fflush(stdout); 2365 if (debug) { 2366 syslog(LOG_DEBUG, "<--- %d%c", abs(n), (n < 0) ? '-' : ' '); 2367 va_start(ap, fmt); 2368 vsyslog(LOG_DEBUG, fmt, ap); 2369 va_end(ap); 2370 } 2371 } 2372 2373 static void 2374 logremotehost(struct sockinet *who) 2375 { 2376 2377 if (getnameinfo((struct sockaddr *)&who->si_su, 2378 who->su_len, remotehost, sizeof(remotehost), NULL, 0, 0)) 2379 strlcpy(remotehost, "?", sizeof(remotehost)); 2380 2381 #if HAVE_SETPROCTITLE 2382 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2383 setproctitle("%s", proctitle); 2384 #endif /* HAVE_SETPROCTITLE */ 2385 if (logging) 2386 syslog(LOG_INFO, "connection from %s to %s", 2387 remotehost, hostname); 2388 } 2389 2390 /* 2391 * Record logout in wtmp file and exit with supplied status. 2392 */ 2393 void 2394 dologout(int status) 2395 { 2396 /* 2397 * Prevent reception of SIGURG from resulting in a resumption 2398 * back to the main program loop. 2399 */ 2400 transflag = 0; 2401 logout_utmp(); 2402 if (logged_in) { 2403 #ifdef KERBEROS 2404 if (!notickets && krbtkfile_env) 2405 unlink(krbtkfile_env); 2406 #endif 2407 } 2408 /* beware of flushing buffers after a SIGPIPE */ 2409 _exit(status); 2410 } 2411 2412 void 2413 abor(void) 2414 { 2415 2416 tmpline[0] = '\0'; 2417 is_oob = 0; 2418 reply(426, "Transfer aborted. Data connection closed."); 2419 reply(226, "Abort successful"); 2420 longjmp(urgcatch, 1); 2421 } 2422 2423 void 2424 statxfer(void) 2425 { 2426 2427 tmpline[0] = '\0'; 2428 is_oob = 0; 2429 if (file_size != (off_t) -1) 2430 reply(213, 2431 "Status: " LLF " of " LLF " byte%s transferred", 2432 (LLT)byte_count, (LLT)file_size, 2433 PLURAL(byte_count)); 2434 else 2435 reply(213, "Status: " LLF " byte%s transferred", 2436 (LLT)byte_count, PLURAL(byte_count)); 2437 } 2438 2439 static void 2440 myoob(int signo) 2441 { 2442 char *cp; 2443 2444 /* only process if transfer occurring */ 2445 if (!transflag) 2446 return; 2447 cp = tmpline; 2448 if (getline(cp, sizeof(tmpline), stdin) == NULL) { 2449 reply(221, "You could at least say goodbye."); 2450 dologout(0); 2451 } 2452 is_oob = 1; 2453 ftp_handle_line(cp); 2454 is_oob = 0; 2455 } 2456 2457 static int 2458 bind_pasv_addr(void) 2459 { 2460 static int passiveport; 2461 int port, len; 2462 2463 len = pasv_addr.su_len; 2464 if (curclass.portmin == 0 && curclass.portmax == 0) { 2465 pasv_addr.su_port = 0; 2466 return (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len)); 2467 } 2468 2469 if (passiveport == 0) { 2470 srand(getpid()); 2471 passiveport = rand() % (curclass.portmax - curclass.portmin) 2472 + curclass.portmin; 2473 } 2474 2475 port = passiveport; 2476 while (1) { 2477 port++; 2478 if (port > curclass.portmax) 2479 port = curclass.portmin; 2480 else if (port == passiveport) { 2481 errno = EAGAIN; 2482 return (-1); 2483 } 2484 pasv_addr.su_port = htons(port); 2485 if (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len) == 0) 2486 break; 2487 if (errno != EADDRINUSE) 2488 return (-1); 2489 } 2490 passiveport = port; 2491 return (0); 2492 } 2493 2494 /* 2495 * Note: a response of 425 is not mentioned as a possible response to 2496 * the PASV command in RFC959. However, it has been blessed as 2497 * a legitimate response by Jon Postel in a telephone conversation 2498 * with Rick Adams on 25 Jan 89. 2499 */ 2500 void 2501 passive(void) 2502 { 2503 int len; 2504 char *p, *a; 2505 2506 if (pdata >= 0) 2507 close(pdata); 2508 pdata = socket(AF_INET, SOCK_STREAM, 0); 2509 if (pdata < 0 || !logged_in) { 2510 perror_reply(425, "Can't open passive connection"); 2511 return; 2512 } 2513 pasv_addr = ctrl_addr; 2514 2515 if (bind_pasv_addr() < 0) 2516 goto pasv_error; 2517 len = pasv_addr.su_len; 2518 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 2519 goto pasv_error; 2520 pasv_addr.su_len = len; 2521 if (listen(pdata, 1) < 0) 2522 goto pasv_error; 2523 if (curclass.advertise.su_len != 0) 2524 a = (char *) &curclass.advertise.su_addr; 2525 else 2526 a = (char *) &pasv_addr.su_addr; 2527 p = (char *) &pasv_addr.su_port; 2528 2529 #define UC(b) (((int) b) & 0xff) 2530 2531 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2532 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2533 return; 2534 2535 pasv_error: 2536 (void) close(pdata); 2537 pdata = -1; 2538 perror_reply(425, "Can't open passive connection"); 2539 return; 2540 } 2541 2542 /* 2543 * convert protocol identifier to/from AF 2544 */ 2545 int 2546 lpsvproto2af(int proto) 2547 { 2548 2549 switch (proto) { 2550 case 4: 2551 return AF_INET; 2552 #ifdef INET6 2553 case 6: 2554 return AF_INET6; 2555 #endif 2556 default: 2557 return -1; 2558 } 2559 } 2560 2561 int 2562 af2lpsvproto(int af) 2563 { 2564 2565 switch (af) { 2566 case AF_INET: 2567 return 4; 2568 #ifdef INET6 2569 case AF_INET6: 2570 return 6; 2571 #endif 2572 default: 2573 return -1; 2574 } 2575 } 2576 2577 int 2578 epsvproto2af(int proto) 2579 { 2580 2581 switch (proto) { 2582 case 1: 2583 return AF_INET; 2584 #ifdef INET6 2585 case 2: 2586 return AF_INET6; 2587 #endif 2588 default: 2589 return -1; 2590 } 2591 } 2592 2593 int 2594 af2epsvproto(int af) 2595 { 2596 2597 switch (af) { 2598 case AF_INET: 2599 return 1; 2600 #ifdef INET6 2601 case AF_INET6: 2602 return 2; 2603 #endif 2604 default: 2605 return -1; 2606 } 2607 } 2608 2609 /* 2610 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2611 * 229 Entering Extended Passive Mode (|||port|) 2612 */ 2613 void 2614 long_passive(char *cmd, int pf) 2615 { 2616 int len; 2617 char *p, *a; 2618 2619 if (!logged_in) { 2620 syslog(LOG_NOTICE, "long passive but not logged in"); 2621 reply(503, "Login with USER first."); 2622 return; 2623 } 2624 2625 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 2626 /* 2627 * XXX: only EPRT/EPSV ready clients will understand this 2628 */ 2629 if (strcmp(cmd, "EPSV") != 0) 2630 reply(501, "Network protocol mismatch"); /*XXX*/ 2631 else 2632 epsv_protounsupp("Network protocol mismatch"); 2633 2634 return; 2635 } 2636 2637 if (pdata >= 0) 2638 close(pdata); 2639 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2640 if (pdata < 0) { 2641 perror_reply(425, "Can't open passive connection"); 2642 return; 2643 } 2644 pasv_addr = ctrl_addr; 2645 if (bind_pasv_addr() < 0) 2646 goto pasv_error; 2647 len = pasv_addr.su_len; 2648 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 2649 goto pasv_error; 2650 pasv_addr.su_len = len; 2651 if (listen(pdata, 1) < 0) 2652 goto pasv_error; 2653 p = (char *) &pasv_addr.su_port; 2654 2655 #define UC(b) (((int) b) & 0xff) 2656 2657 if (strcmp(cmd, "LPSV") == 0) { 2658 struct sockinet *advert; 2659 2660 if (curclass.advertise.su_len != 0) 2661 advert = &curclass.advertise; 2662 else 2663 advert = &pasv_addr; 2664 switch (advert->su_family) { 2665 case AF_INET: 2666 a = (char *) &advert->su_addr; 2667 reply(228, 2668 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2669 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2670 2, UC(p[0]), UC(p[1])); 2671 return; 2672 #ifdef INET6 2673 case AF_INET6: 2674 a = (char *) &advert->su_6addr; 2675 reply(228, 2676 "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)", 2677 6, 16, 2678 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2679 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2680 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2681 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2682 2, UC(p[0]), UC(p[1])); 2683 return; 2684 #endif 2685 } 2686 #undef UC 2687 } else if (strcmp(cmd, "EPSV") == 0) { 2688 switch (pasv_addr.su_family) { 2689 case AF_INET: 2690 #ifdef INET6 2691 case AF_INET6: 2692 #endif 2693 reply(229, "Entering Extended Passive Mode (|||%d|)", 2694 ntohs(pasv_addr.su_port)); 2695 return; 2696 } 2697 } else { 2698 /* more proper error code? */ 2699 } 2700 2701 pasv_error: 2702 (void) close(pdata); 2703 pdata = -1; 2704 perror_reply(425, "Can't open passive connection"); 2705 return; 2706 } 2707 2708 int 2709 extended_port(const char *arg) 2710 { 2711 char *tmp = NULL; 2712 char *result[3]; 2713 char *p, *q; 2714 char delim; 2715 struct addrinfo hints; 2716 struct addrinfo *res = NULL; 2717 int i; 2718 unsigned long proto; 2719 2720 tmp = xstrdup(arg); 2721 p = tmp; 2722 delim = p[0]; 2723 p++; 2724 memset(result, 0, sizeof(result)); 2725 for (i = 0; i < 3; i++) { 2726 q = strchr(p, delim); 2727 if (!q || *q != delim) 2728 goto parsefail; 2729 *q++ = '\0'; 2730 result[i] = p; 2731 p = q; 2732 } 2733 2734 /* some more sanity checks */ 2735 p = NULL; 2736 (void)strtoul(result[2], &p, 10); 2737 if (!*result[2] || *p) 2738 goto parsefail; 2739 p = NULL; 2740 proto = strtoul(result[0], &p, 10); 2741 if (!*result[0] || *p) 2742 goto protounsupp; 2743 2744 memset(&hints, 0, sizeof(hints)); 2745 hints.ai_family = epsvproto2af((int)proto); 2746 if (hints.ai_family < 0) 2747 goto protounsupp; 2748 hints.ai_socktype = SOCK_STREAM; 2749 hints.ai_flags = AI_NUMERICHOST; 2750 if (getaddrinfo(result[1], result[2], &hints, &res)) 2751 goto parsefail; 2752 if (res->ai_next) 2753 goto parsefail; 2754 if (sizeof(data_dest) < res->ai_addrlen) 2755 goto parsefail; 2756 memcpy(&data_dest.si_su, res->ai_addr, res->ai_addrlen); 2757 data_dest.su_len = res->ai_addrlen; 2758 #ifdef INET6 2759 if (his_addr.su_family == AF_INET6 && 2760 data_dest.su_family == AF_INET6) { 2761 /* XXX: more sanity checks! */ 2762 data_dest.su_scope_id = his_addr.su_scope_id; 2763 } 2764 #endif 2765 2766 if (tmp != NULL) 2767 free(tmp); 2768 if (res) 2769 freeaddrinfo(res); 2770 return 0; 2771 2772 parsefail: 2773 reply(500, "Invalid argument, rejected."); 2774 usedefault = 1; 2775 if (tmp != NULL) 2776 free(tmp); 2777 if (res) 2778 freeaddrinfo(res); 2779 return -1; 2780 2781 protounsupp: 2782 epsv_protounsupp("Protocol not supported"); 2783 usedefault = 1; 2784 if (tmp != NULL) 2785 free(tmp); 2786 if (res) 2787 freeaddrinfo(res); 2788 return -1; 2789 } 2790 2791 /* 2792 * 522 Protocol not supported (proto,...) 2793 * as we assume address family for control and data connections are the same, 2794 * we do not return the list of address families we support - instead, we 2795 * return the address family of the control connection. 2796 */ 2797 void 2798 epsv_protounsupp(const char *message) 2799 { 2800 int proto; 2801 2802 proto = af2epsvproto(ctrl_addr.su_family); 2803 if (proto < 0) 2804 reply(501, "%s", message); /* XXX */ 2805 else 2806 reply(522, "%s, use (%d)", message, proto); 2807 } 2808 2809 /* 2810 * Generate unique name for file with basename "local". 2811 * The file named "local" is already known to exist. 2812 * Generates failure reply on error. 2813 * 2814 * XXX: this function should under go changes similar to 2815 * the mktemp(3)/mkstemp(3) changes. 2816 */ 2817 static char * 2818 gunique(const char *local) 2819 { 2820 static char new[MAXPATHLEN]; 2821 struct stat st; 2822 char *cp; 2823 int count; 2824 2825 cp = strrchr(local, '/'); 2826 if (cp) 2827 *cp = '\0'; 2828 if (stat(cp ? local : ".", &st) < 0) { 2829 perror_reply(553, cp ? local : "."); 2830 return (NULL); 2831 } 2832 if (cp) 2833 *cp = '/'; 2834 for (count = 1; count < 100; count++) { 2835 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2836 if (stat(new, &st) < 0) 2837 return (new); 2838 } 2839 reply(452, "Unique file name cannot be created."); 2840 return (NULL); 2841 } 2842 2843 /* 2844 * Format and send reply containing system error number. 2845 */ 2846 void 2847 perror_reply(int code, const char *string) 2848 { 2849 int save_errno; 2850 2851 save_errno = errno; 2852 reply(code, "%s: %s.", string, strerror(errno)); 2853 errno = save_errno; 2854 } 2855 2856 static char *onefile[] = { 2857 "", 2858 0 2859 }; 2860 2861 void 2862 send_file_list(const char *whichf) 2863 { 2864 struct stat st; 2865 DIR *dirp = NULL; 2866 struct dirent *dir; 2867 FILE *dout = NULL; 2868 char **dirlist, *dirname, *notglob, *p; 2869 int simple = 0; 2870 int freeglob = 0; 2871 glob_t gl; 2872 2873 #ifdef __GNUC__ 2874 (void) &dout; 2875 (void) &dirlist; 2876 (void) &simple; 2877 (void) &freeglob; 2878 #endif 2879 2880 p = NULL; 2881 if (strpbrk(whichf, "~{[*?") != NULL) { 2882 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE|GLOB_LIMIT; 2883 2884 memset(&gl, 0, sizeof(gl)); 2885 freeglob = 1; 2886 if (glob(whichf, flags, 0, &gl)) { 2887 reply(550, "not found"); 2888 goto out; 2889 } else if (gl.gl_pathc == 0) { 2890 errno = ENOENT; 2891 perror_reply(550, whichf); 2892 goto out; 2893 } 2894 dirlist = gl.gl_pathv; 2895 } else { 2896 notglob = xstrdup(whichf); 2897 onefile[0] = notglob; 2898 dirlist = onefile; 2899 simple = 1; 2900 } 2901 /* XXX: } for vi sm */ 2902 2903 if (setjmp(urgcatch)) { 2904 transflag = 0; 2905 goto out; 2906 } 2907 while ((dirname = *dirlist++) != NULL) { 2908 int trailingslash = 0; 2909 2910 if (stat(dirname, &st) < 0) { 2911 /* 2912 * If user typed "ls -l", etc, and the client 2913 * used NLST, do what the user meant. 2914 */ 2915 /* XXX: nuke this support? */ 2916 if (dirname[0] == '-' && *dirlist == NULL && 2917 transflag == 0) { 2918 char *argv[] = { INTERNAL_LS, "", NULL }; 2919 2920 argv[1] = dirname; 2921 retrieve(argv, dirname); 2922 goto out; 2923 } 2924 perror_reply(550, whichf); 2925 goto cleanup_send_file_list; 2926 } 2927 2928 if (S_ISREG(st.st_mode)) { 2929 /* 2930 * XXXRFC: 2931 * should we follow RFC959 and not work 2932 * for non directories? 2933 */ 2934 if (dout == NULL) { 2935 dout = dataconn("file list", (off_t)-1, "w"); 2936 if (dout == NULL) 2937 goto out; 2938 transflag++; 2939 } 2940 cprintf(dout, "%s%s\n", dirname, 2941 type == TYPE_A ? "\r" : ""); 2942 continue; 2943 } else if (!S_ISDIR(st.st_mode)) 2944 continue; 2945 2946 if (dirname[strlen(dirname) - 1] == '/') 2947 trailingslash++; 2948 2949 if ((dirp = opendir(dirname)) == NULL) 2950 continue; 2951 2952 while ((dir = readdir(dirp)) != NULL) { 2953 char nbuf[MAXPATHLEN]; 2954 2955 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 2956 continue; 2957 2958 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2959 trailingslash ? "" : "/", dir->d_name); 2960 2961 /* 2962 * We have to do a stat to ensure it's 2963 * not a directory or special file. 2964 */ 2965 /* 2966 * XXXRFC: 2967 * should we follow RFC959 and filter out 2968 * non files ? lukem - NO!, or not until 2969 * our ftp client uses MLS{T,D} for completion. 2970 */ 2971 if (simple || (stat(nbuf, &st) == 0 && 2972 S_ISREG(st.st_mode))) { 2973 if (dout == NULL) { 2974 dout = dataconn("file list", (off_t)-1, 2975 "w"); 2976 if (dout == NULL) 2977 goto out; 2978 transflag++; 2979 } 2980 p = nbuf; 2981 if (nbuf[0] == '.' && nbuf[1] == '/') 2982 p = &nbuf[2]; 2983 cprintf(dout, "%s%s\n", p, 2984 type == TYPE_A ? "\r" : ""); 2985 } 2986 } 2987 (void) closedir(dirp); 2988 } 2989 2990 if (dout == NULL) 2991 reply(550, "No files found."); 2992 else if (ferror(dout) != 0) 2993 perror_reply(550, "Data connection"); 2994 else 2995 reply(226, "Transfer complete."); 2996 2997 cleanup_send_file_list: 2998 transflag = 0; 2999 closedataconn(dout); 3000 out: 3001 total_xfers++; 3002 total_xfers_out++; 3003 if (notglob) 3004 free(notglob); 3005 if (freeglob) 3006 globfree(&gl); 3007 } 3008 3009 char * 3010 conffilename(const char *s) 3011 { 3012 static char filename[MAXPATHLEN]; 3013 3014 if (*s == '/') 3015 strlcpy(filename, s, sizeof(filename)); 3016 else 3017 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 3018 return (filename); 3019 } 3020 3021 /* 3022 * logxfer -- 3023 * if logging > 1, then based on the arguments, syslog a message: 3024 * if bytes != -1 "<command> <file1> = <bytes> bytes" 3025 * else if file2 != NULL "<command> <file1> <file2>" 3026 * else "<command> <file1>" 3027 * if elapsed != NULL, append "in xxx.yyy seconds" 3028 * if error != NULL, append ": " + error 3029 * 3030 * if doxferlog != 0, bytes != -1, and command is "get", "put", 3031 * or "append", syslog a wu-ftpd style xferlog entry 3032 */ 3033 void 3034 logxfer(const char *command, off_t bytes, const char *file1, const char *file2, 3035 const struct timeval *elapsed, const char *error) 3036 { 3037 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN]; 3038 const char *r1, *r2; 3039 char direction; 3040 size_t len; 3041 time_t now; 3042 3043 if (logging <=1 && !doxferlog) 3044 return; 3045 3046 r1 = r2 = NULL; 3047 if ((r1 = realpath(file1, realfile)) == NULL) 3048 r1 = file1; 3049 if (file2 != NULL) 3050 if ((r2 = realpath(file2, realfile)) == NULL) 3051 r2 = file2; 3052 3053 /* 3054 * syslog command 3055 */ 3056 if (logging > 1) { 3057 len = snprintf(buf, sizeof(buf), "%s %s", command, r1); 3058 if (bytes != (off_t)-1) 3059 len += snprintf(buf + len, sizeof(buf) - len, 3060 " = " LLF " byte%s", (LLT) bytes, PLURAL(bytes)); 3061 else if (r2 != NULL) 3062 len += snprintf(buf + len, sizeof(buf) - len, 3063 " %s", r2); 3064 if (elapsed != NULL) 3065 len += snprintf(buf + len, sizeof(buf) - len, 3066 " in %ld.%.03d seconds", elapsed->tv_sec, 3067 (int)(elapsed->tv_usec / 1000)); 3068 if (error != NULL) 3069 len += snprintf(buf + len, sizeof(buf) - len, 3070 ": %s", error); 3071 syslog(LOG_INFO, "%s", buf); 3072 } 3073 3074 3075 /* 3076 * syslog wu-ftpd style log entry, prefixed with "xferlog: " 3077 */ 3078 if (!doxferlog || bytes == -1) 3079 return; 3080 3081 if (strcmp(command, "get") == 0) 3082 direction = 'o'; 3083 else if (strcmp(command, "put") == 0 || strcmp(command, "append") == 0) 3084 direction = 'i'; 3085 else 3086 return; 3087 3088 time(&now); 3089 syslog(LOG_INFO, 3090 "xferlog%s: %.24s %ld %s " LLF " %s %c %s %c %c %s FTP 0 * %c", 3091 3092 /* 3093 * XXX: wu-ftpd puts (send) or (recv) in the syslog message, and removes 3094 * the full date. This may be problematic for accurate log parsing, 3095 * given that syslog messages don't contain the full date. 3096 */ 3097 #if 1 /* lukem's method; easier to convert to actual xferlog file */ 3098 "", 3099 ctime(&now), 3100 #else /* wu-ftpd's syslog method, with an extra unneeded space */ 3101 (direction == 'i') ? " (recv)" : " (send)", 3102 "", 3103 #endif 3104 elapsed == NULL ? 0 : elapsed->tv_sec + (elapsed->tv_usec > 0), 3105 remotehost, 3106 (LLT) bytes, 3107 r1, 3108 type == TYPE_A ? 'a' : 'b', 3109 "_", /* XXX: take conversions into account? */ 3110 direction, 3111 3112 curclass.type == CLASS_GUEST ? 'a' : 3113 curclass.type == CLASS_CHROOT ? 'g' : 3114 curclass.type == CLASS_REAL ? 'r' : '?', 3115 3116 curclass.type == CLASS_GUEST ? pw->pw_passwd : pw->pw_name, 3117 error != NULL ? 'i' : 'c' 3118 ); 3119 } 3120 3121 /* 3122 * Log the resource usage. 3123 * 3124 * XXX: more resource usage to logging? 3125 */ 3126 void 3127 logrusage(const struct rusage *rusage_before, 3128 const struct rusage *rusage_after) 3129 { 3130 struct timeval usrtime, systime; 3131 3132 if (logging <= 1) 3133 return; 3134 3135 timersub(&rusage_after->ru_utime, &rusage_before->ru_utime, &usrtime); 3136 timersub(&rusage_after->ru_stime, &rusage_before->ru_stime, &systime); 3137 syslog(LOG_INFO, "%ld.%.03du %ld.%.03ds %ld+%ldio %ldpf+%ldw", 3138 usrtime.tv_sec, (int)(usrtime.tv_usec / 1000), 3139 systime.tv_sec, (int)(systime.tv_usec / 1000), 3140 rusage_after->ru_inblock - rusage_before->ru_inblock, 3141 rusage_after->ru_oublock - rusage_before->ru_oublock, 3142 rusage_after->ru_majflt - rusage_before->ru_majflt, 3143 rusage_after->ru_nswap - rusage_before->ru_nswap); 3144 } 3145 3146 /* 3147 * Determine if `password' is valid for user given in `pw'. 3148 * Returns 2 if password expired, 1 if otherwise failed, 0 if ok 3149 */ 3150 int 3151 checkpassword(const struct passwd *pwent, const char *password) 3152 { 3153 char *orig, *new; 3154 time_t expire; 3155 3156 expire = 0; 3157 if (pwent == NULL) 3158 return 1; 3159 3160 orig = pwent->pw_passwd; /* save existing password */ 3161 expire = pwent->pw_expire; 3162 3163 if (orig[0] == '\0') /* don't allow empty passwords */ 3164 return 1; 3165 3166 new = crypt(password, orig); /* encrypt given password */ 3167 if (strcmp(new, orig) != 0) /* compare */ 3168 return 1; 3169 3170 if (expire && time(NULL) >= expire) 3171 return 2; /* check if expired */ 3172 3173 return 0; /* OK! */ 3174 } 3175 3176 char * 3177 xstrdup(const char *s) 3178 { 3179 char *new = strdup(s); 3180 3181 if (new == NULL) 3182 fatal("Local resource failure: malloc"); 3183 /* NOTREACHED */ 3184 return (new); 3185 } 3186 3187 /* 3188 * As per fprintf(), but increment total_bytes and total_bytes_out, 3189 * by the appropriate amount. 3190 */ 3191 void 3192 cprintf(FILE *fd, const char *fmt, ...) 3193 { 3194 off_t b; 3195 va_list ap; 3196 3197 va_start(ap, fmt); 3198 b = vfprintf(fd, fmt, ap); 3199 va_end(ap); 3200 total_bytes += b; 3201 total_bytes_out += b; 3202 } 3203