1 /* $NetBSD: ftpd.c,v 1.154 2003/02/26 12:27:04 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2003 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 1.154 2003/02/26 12:27:04 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/write wu-ftpd style xferlog entries */ 187 int xferlogfd; /* fd to write wu-ftpd xferlog entries to */ 188 int dropprivs; /* if privileges should or have been dropped */ 189 int mapped; /* IPv4 connection on AF_INET6 socket */ 190 off_t file_size; 191 off_t byte_count; 192 static char ttyline[20]; 193 #ifdef SUPPORT_UTMP 194 static struct utmp utmp; /* for utmp */ 195 #endif 196 #ifdef SUPPORT_UTMPX 197 static struct utmpx utmpx; /* for utmpx */ 198 #endif 199 200 static const char *anondir = NULL; 201 static const char *confdir = _DEFAULT_CONFDIR; 202 203 #if defined(KERBEROS) || defined(KERBEROS5) 204 int has_ccache = 0; 205 int notickets = 1; 206 char *krbtkfile_env = NULL; 207 char *tty = ttyline; 208 int login_krb5_forwardable_tgt = 0; 209 #endif 210 211 int epsvall = 0; 212 213 /* 214 * Timeout intervals for retrying connections 215 * to hosts that don't accept PORT cmds. This 216 * is a kludge, but given the problems with TCP... 217 */ 218 #define SWAITMAX 90 /* wait at most 90 seconds */ 219 #define SWAITINT 5 /* interval between retries */ 220 221 int swaitmax = SWAITMAX; 222 int swaitint = SWAITINT; 223 224 enum send_status { 225 SS_SUCCESS, 226 SS_NO_TRANSFER, /* no transfer made yet */ 227 SS_FILE_ERROR, /* file read error */ 228 SS_DATA_ERROR /* data send error */ 229 }; 230 231 static int bind_pasv_addr(void); 232 static int checkuser(const char *, const char *, int, int, char **); 233 static int checkaccess(const char *); 234 static int checkpassword(const struct passwd *, const char *); 235 static void end_login(void); 236 static FILE *getdatasock(const char *); 237 static char *gunique(const char *); 238 static void login_utmp(const char *, const char *, const char *); 239 static void logremotehost(struct sockinet *); 240 static void lostconn(int); 241 static void myoob(int); 242 static int receive_data(FILE *, FILE *); 243 static int send_data(FILE *, FILE *, const struct stat *, int); 244 static struct passwd *sgetpwnam(const char *); 245 static int write_data(int, char *, size_t, off_t *, struct timeval *, 246 int); 247 static enum send_status 248 send_data_with_read(int, int, const struct stat *, int); 249 static enum send_status 250 send_data_with_mmap(int, int, const struct stat *, int); 251 static void logrusage(const struct rusage *, const struct rusage *); 252 static void logout_utmp(void); 253 254 int main(int, char *[]); 255 256 #if defined(KERBEROS) 257 int klogin(struct passwd *, char *, char *, char *); 258 void kdestroy(void); 259 #endif 260 #if defined(KERBEROS5) 261 int k5login(struct passwd *, char *, char *, char *); 262 void k5destroy(void); 263 #endif 264 265 int 266 main(int argc, char *argv[]) 267 { 268 int addrlen, ch, on = 1, tos, keepalive; 269 #ifdef KERBEROS5 270 krb5_error_code kerror; 271 #endif 272 char *p; 273 const char *xferlogname = NULL; 274 long l; 275 276 connections = 1; 277 debug = 0; 278 logging = 0; 279 pdata = -1; 280 sflag = 0; 281 dataport = 0; 282 dopidfile = 1; /* default: DO use a pid file to count users */ 283 doutmp = 0; /* default: Do NOT log to utmp */ 284 dowtmp = 1; /* default: DO log to wtmp */ 285 doxferlog = 0; /* default: Do NOT syslog xferlog */ 286 xferlogfd = -1; /* default: Do NOT write xferlog file */ 287 dropprivs = 0; 288 mapped = 0; 289 usedefault = 1; 290 emailaddr = NULL; 291 hostname[0] = '\0'; 292 homedir[0] = '\0'; 293 gidcount = 0; 294 is_oob = 0; 295 version = FTPD_VERSION; 296 297 /* 298 * LOG_NDELAY sets up the logging connection immediately, 299 * necessary for anonymous ftp's that chroot and can't do it later. 300 */ 301 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 302 303 while ((ch = getopt(argc, argv, "a:c:C:de:h:HlL:P:qQrst:T:uUvV:wWX")) 304 != -1) { 305 switch (ch) { 306 case 'a': 307 anondir = optarg; 308 break; 309 310 case 'c': 311 confdir = optarg; 312 break; 313 314 case 'C': 315 pw = sgetpwnam(optarg); 316 exit(checkaccess(optarg) ? 0 : 1); 317 /* NOTREACHED */ 318 319 case 'd': 320 case 'v': /* deprecated */ 321 debug = 1; 322 break; 323 324 case 'e': 325 emailaddr = optarg; 326 break; 327 328 case 'h': 329 strlcpy(hostname, optarg, sizeof(hostname)); 330 break; 331 332 case 'H': 333 if (gethostname(hostname, sizeof(hostname)) == -1) 334 hostname[0] = '\0'; 335 hostname[sizeof(hostname) - 1] = '\0'; 336 break; 337 338 case 'l': 339 logging++; /* > 1 == extra logging */ 340 break; 341 342 case 'L': 343 xferlogname = optarg; 344 break; 345 346 case 'P': 347 errno = 0; 348 p = NULL; 349 l = strtol(optarg, &p, 10); 350 if (errno || *optarg == '\0' || *p != '\0' || 351 l < IPPORT_RESERVED || 352 l > IPPORT_ANONMAX) { 353 syslog(LOG_WARNING, "Invalid dataport %s", 354 optarg); 355 dataport = 0; 356 } 357 dataport = (int)l; 358 break; 359 360 case 'q': 361 dopidfile = 1; 362 break; 363 364 case 'Q': 365 dopidfile = 0; 366 break; 367 368 case 'r': 369 dropprivs = 1; 370 break; 371 372 case 's': 373 sflag = 1; 374 break; 375 376 case 't': 377 case 'T': 378 syslog(LOG_WARNING, 379 "-%c has been deprecated in favour of ftpd.conf", 380 ch); 381 break; 382 383 case 'u': 384 doutmp = 1; 385 break; 386 387 case 'U': 388 doutmp = 0; 389 break; 390 391 case 'V': 392 if (EMPTYSTR(optarg) || strcmp(optarg, "-") == 0) 393 version = NULL; 394 else 395 version = xstrdup(optarg); 396 break; 397 398 case 'w': 399 dowtmp = 1; 400 break; 401 402 case 'W': 403 dowtmp = 0; 404 break; 405 406 case 'X': 407 doxferlog |= 1; 408 break; 409 410 default: 411 if (optopt == 'a' || optopt == 'C') 412 exit(1); 413 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 414 break; 415 } 416 } 417 if (EMPTYSTR(confdir)) 418 confdir = _DEFAULT_CONFDIR; 419 420 memset((char *)&his_addr, 0, sizeof(his_addr)); 421 addrlen = sizeof(his_addr.si_su); 422 if (getpeername(0, (struct sockaddr *)&his_addr.si_su, &addrlen) < 0) { 423 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 424 exit(1); 425 } 426 his_addr.su_len = addrlen; 427 memset((char *)&ctrl_addr, 0, sizeof(ctrl_addr)); 428 addrlen = sizeof(ctrl_addr.si_su); 429 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 430 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 431 exit(1); 432 } 433 ctrl_addr.su_len = addrlen; 434 #ifdef INET6 435 if (his_addr.su_family == AF_INET6 436 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_6addr)) { 437 #if 1 438 /* 439 * IPv4 control connection arrived to AF_INET6 socket. 440 * I hate to do this, but this is the easiest solution. 441 * 442 * The assumption is untrue on SIIT environment. 443 */ 444 struct sockinet tmp_addr; 445 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 446 447 tmp_addr = his_addr; 448 memset(&his_addr, 0, sizeof(his_addr)); 449 his_addr.su_family = AF_INET; 450 his_addr.su_len = sizeof(his_addr.si_su.su_sin); 451 memcpy(&his_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 452 sizeof(his_addr.su_addr)); 453 his_addr.su_port = tmp_addr.su_port; 454 455 tmp_addr = ctrl_addr; 456 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 457 ctrl_addr.su_family = AF_INET; 458 ctrl_addr.su_len = sizeof(ctrl_addr.si_su.su_sin); 459 memcpy(&ctrl_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 460 sizeof(ctrl_addr.su_addr)); 461 ctrl_addr.su_port = tmp_addr.su_port; 462 #else 463 while (fgets(line, sizeof(line), fd) != NULL) { 464 if ((cp = strchr(line, '\n')) != NULL) 465 *cp = '\0'; 466 reply(-530, "%s", line); 467 } 468 (void) fflush(stdout); 469 (void) fclose(fd); 470 reply(530, 471 "Connection from IPv4 mapped address is not supported."); 472 exit(0); 473 #endif 474 475 mapped = 1; 476 } else 477 #endif /* INET6 */ 478 mapped = 0; 479 #ifdef IP_TOS 480 if (!mapped && his_addr.su_family == AF_INET) { 481 tos = IPTOS_LOWDELAY; 482 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 483 sizeof(int)) < 0) 484 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 485 } 486 #endif 487 /* if the hostname hasn't been given, attempt to determine it */ 488 if (hostname[0] == '\0') { 489 if (getnameinfo((struct sockaddr *)&ctrl_addr.si_su, 490 ctrl_addr.su_len, hostname, sizeof(hostname), NULL, 0, 0) 491 != 0) 492 (void)gethostname(hostname, sizeof(hostname)); 493 hostname[sizeof(hostname) - 1] = '\0'; 494 } 495 496 /* set this here so klogin can use it... */ 497 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 498 499 (void) freopen(_PATH_DEVNULL, "w", stderr); 500 (void) signal(SIGPIPE, lostconn); 501 (void) signal(SIGCHLD, SIG_IGN); 502 if (signal(SIGURG, myoob) == SIG_ERR) 503 syslog(LOG_WARNING, "signal: %m"); 504 505 /* Try to handle urgent data inline */ 506 #ifdef SO_OOBINLINE 507 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 508 syslog(LOG_WARNING, "setsockopt: %m"); 509 #endif 510 /* Set keepalives on the socket to detect dropped connections. */ 511 #ifdef SO_KEEPALIVE 512 keepalive = 1; 513 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 514 sizeof(int)) < 0) 515 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 516 #endif 517 518 #ifdef F_SETOWN 519 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 520 syslog(LOG_WARNING, "fcntl F_SETOWN: %m"); 521 #endif 522 logremotehost(&his_addr); 523 /* 524 * Set up default state 525 */ 526 data = -1; 527 type = TYPE_A; 528 form = FORM_N; 529 stru = STRU_F; 530 mode = MODE_S; 531 tmpline[0] = '\0'; 532 hasyyerrored = 0; 533 534 #ifdef KERBEROS5 535 kerror = krb5_init_context(&kcontext); 536 if (kerror) { 537 syslog(LOG_ERR, "%s when initializing Kerberos context", 538 error_message(kerror)); 539 exit(0); 540 } 541 #endif /* KERBEROS5 */ 542 543 init_curclass(); 544 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 545 curclass.type = CLASS_REAL; 546 547 /* If logins are disabled, print out the message. */ 548 if (display_file(_PATH_NOLOGIN, 530)) { 549 reply(530, "System not available."); 550 exit(0); 551 } 552 (void)display_file(conffilename(_PATH_FTPWELCOME), 220); 553 /* reply(220,) must follow */ 554 if (EMPTYSTR(version)) 555 reply(220, "%s FTP server ready.", hostname); 556 else 557 reply(220, "%s FTP server (%s) ready.", hostname, version); 558 559 if (xferlogname != NULL) { 560 xferlogfd = open(xferlogname, O_WRONLY | O_APPEND | O_CREAT, 561 0660); 562 if (xferlogfd == -1) 563 syslog(LOG_WARNING, "open xferlog `%s': %m", 564 xferlogname); 565 else 566 doxferlog |= 2; 567 } 568 569 (void) setjmp(errcatch); 570 ftp_loop(); 571 /* NOTREACHED */ 572 } 573 574 static void 575 lostconn(int signo) 576 { 577 578 if (debug) 579 syslog(LOG_DEBUG, "lost connection"); 580 dologout(1); 581 } 582 583 /* 584 * Save the result of a getpwnam. Used for USER command, since 585 * the data returned must not be clobbered by any other command 586 * (e.g., globbing). 587 */ 588 static struct passwd * 589 sgetpwnam(const char *name) 590 { 591 static struct passwd save; 592 struct passwd *p; 593 594 if ((p = getpwnam(name)) == NULL) 595 return (p); 596 if (save.pw_name) { 597 free((char *)save.pw_name); 598 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 599 free((char *)save.pw_passwd); 600 free((char *)save.pw_gecos); 601 free((char *)save.pw_dir); 602 free((char *)save.pw_shell); 603 } 604 save = *p; 605 save.pw_name = xstrdup(p->pw_name); 606 save.pw_passwd = xstrdup(p->pw_passwd); 607 save.pw_gecos = xstrdup(p->pw_gecos); 608 save.pw_dir = xstrdup(p->pw_dir); 609 save.pw_shell = xstrdup(p->pw_shell); 610 return (&save); 611 } 612 613 static int login_attempts; /* number of failed login attempts */ 614 static int askpasswd; /* had USER command, ask for PASSwd */ 615 static int permitted; /* USER permitted */ 616 static char curname[LOGIN_NAME_MAX]; /* current USER name */ 617 618 /* 619 * USER command. 620 * Sets global passwd pointer pw if named account exists and is acceptable; 621 * sets askpasswd if a PASS command is expected. If logged in previously, 622 * need to reset state. If name is "ftp" or "anonymous", the name is not in 623 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 624 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 625 * requesting login privileges. Disallow anyone who does not have a standard 626 * shell as returned by getusershell(). Disallow anyone mentioned in the file 627 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 628 */ 629 void 630 user(const char *name) 631 { 632 char *class; 633 634 class = NULL; 635 if (logged_in) { 636 switch (curclass.type) { 637 case CLASS_GUEST: 638 reply(530, "Can't change user from guest login."); 639 return; 640 case CLASS_CHROOT: 641 reply(530, "Can't change user from chroot user."); 642 return; 643 case CLASS_REAL: 644 if (dropprivs) { 645 reply(530, "Can't change user."); 646 return; 647 } 648 end_login(); 649 break; 650 default: 651 abort(); 652 } 653 } 654 655 #if defined(KERBEROS) 656 kdestroy(); 657 #endif 658 #if defined(KERBEROS5) 659 k5destroy(); 660 #endif 661 662 curclass.type = CLASS_REAL; 663 askpasswd = 0; 664 permitted = 0; 665 666 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 667 /* need `pw' setup for checkaccess() and checkuser () */ 668 if ((pw = sgetpwnam("ftp")) == NULL) 669 reply(530, "User %s unknown.", name); 670 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 671 reply(530, "User %s access denied.", name); 672 else { 673 curclass.type = CLASS_GUEST; 674 askpasswd = 1; 675 reply(331, 676 "Guest login ok, type your name as password."); 677 } 678 if (!askpasswd) { 679 if (logging) 680 syslog(LOG_NOTICE, 681 "ANONYMOUS FTP LOGIN REFUSED FROM %s", 682 remotehost); 683 end_login(); 684 goto cleanup_user; 685 } 686 name = "ftp"; 687 } else 688 pw = sgetpwnam(name); 689 690 strlcpy(curname, name, sizeof(curname)); 691 692 /* check user in /etc/ftpusers, and setup class */ 693 permitted = checkuser(_PATH_FTPUSERS, curname, 1, 0, &class); 694 695 /* check user in /etc/ftpchroot */ 696 if (checkuser(_PATH_FTPCHROOT, curname, 0, 0, NULL)) { 697 if (curclass.type == CLASS_GUEST) { 698 syslog(LOG_NOTICE, 699 "Can't change guest user to chroot class; remove entry in %s", 700 _PATH_FTPCHROOT); 701 exit(1); 702 } 703 curclass.type = CLASS_CHROOT; 704 } 705 /* determine default class */ 706 if (class == NULL) { 707 switch (curclass.type) { 708 case CLASS_GUEST: 709 class = xstrdup("guest"); 710 break; 711 case CLASS_CHROOT: 712 class = xstrdup("chroot"); 713 break; 714 case CLASS_REAL: 715 class = xstrdup("real"); 716 break; 717 default: 718 syslog(LOG_ERR, "unknown curclass.type %d; aborting", 719 curclass.type); 720 abort(); 721 } 722 } 723 /* parse ftpd.conf, setting up various parameters */ 724 parse_conf(class); 725 /* if not guest user, check for valid shell */ 726 if (pw == NULL) 727 permitted = 0; 728 else { 729 const char *cp, *shell; 730 731 if ((shell = pw->pw_shell) == NULL || *shell == 0) 732 shell = _PATH_BSHELL; 733 while ((cp = getusershell()) != NULL) 734 if (strcmp(cp, shell) == 0) 735 break; 736 endusershell(); 737 if (cp == NULL && curclass.type != CLASS_GUEST) 738 permitted = 0; 739 } 740 741 /* deny quickly (after USER not PASS) if requested */ 742 if (CURCLASS_FLAGS_ISSET(denyquick) && !permitted) { 743 reply(530, "User %s may not use FTP.", curname); 744 if (logging) 745 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 746 remotehost, curname); 747 end_login(); 748 goto cleanup_user; 749 } 750 751 /* if haven't asked yet (i.e, not anon), ask now */ 752 if (!askpasswd) { 753 askpasswd = 1; 754 #ifdef SKEY 755 if (skey_haskey(curname) == 0) { 756 const char *myskey; 757 758 myskey = skey_keyinfo(curname); 759 reply(331, "Password [ %s ] required for %s.", 760 myskey ? myskey : "error getting challenge", 761 curname); 762 } else 763 #endif 764 reply(331, "Password required for %s.", curname); 765 } 766 767 cleanup_user: 768 /* 769 * Delay before reading passwd after first failed 770 * attempt to slow down passwd-guessing programs. 771 */ 772 if (login_attempts) 773 sleep((unsigned) login_attempts); 774 775 if (class) 776 free(class); 777 } 778 779 /* 780 * Determine whether something is to happen (allow access, chroot) 781 * for a user. Each line is a shell-style glob followed by 782 * `yes' or `no'. 783 * 784 * For backward compatibility, `allow' and `deny' are synonymns 785 * for `yes' and `no', respectively. 786 * 787 * Each glob is matched against the username in turn, and the first 788 * match found is used. If no match is found, the result is the 789 * argument `def'. If a match is found but without and explicit 790 * `yes'/`no', the result is the opposite of def. 791 * 792 * If the file doesn't exist at all, the result is the argument 793 * `nofile' 794 * 795 * Any line starting with `#' is considered a comment and ignored. 796 * 797 * Returns 0 if the user is denied, or 1 if they are allowed. 798 * 799 * NOTE: needs struct passwd *pw setup before use. 800 */ 801 static int 802 checkuser(const char *fname, const char *name, int def, int nofile, 803 char **retclass) 804 { 805 FILE *fd; 806 int retval; 807 char *word, *perm, *class, *buf, *p; 808 size_t len, line; 809 810 retval = def; 811 if (retclass != NULL) 812 *retclass = NULL; 813 if ((fd = fopen(conffilename(fname), "r")) == NULL) 814 return nofile; 815 816 line = 0; 817 for (; 818 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 819 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 820 free(buf), buf = NULL) { 821 word = perm = class = NULL; 822 p = buf; 823 if (len < 1) 824 continue; 825 if (p[len - 1] == '\n') 826 p[--len] = '\0'; 827 if (EMPTYSTR(p)) 828 continue; 829 830 NEXTWORD(p, word); 831 NEXTWORD(p, perm); 832 NEXTWORD(p, class); 833 if (EMPTYSTR(word)) 834 continue; 835 if (!EMPTYSTR(class)) { 836 if (strcasecmp(class, "all") == 0 || 837 strcasecmp(class, "none") == 0) { 838 syslog(LOG_WARNING, 839 "%s line %d: illegal user-defined class `%s' - skipping entry", 840 fname, (int)line, class); 841 continue; 842 } 843 } 844 845 /* have a host specifier */ 846 if ((p = strchr(word, '@')) != NULL) { 847 unsigned long net, mask, addr; 848 int bits; 849 850 *p++ = '\0'; 851 /* check against network or CIDR */ 852 if (isdigit(*p) && 853 (bits = inet_net_pton(AF_INET, p, 854 &net, sizeof(net))) != -1) { 855 net = ntohl(net); 856 mask = 0xffffffffU << (32 - bits); 857 addr = ntohl(his_addr.su_addr.s_addr); 858 if ((addr & mask) != net) 859 continue; 860 861 /* check against hostname glob */ 862 } else if (fnmatch(p, remotehost, FNM_CASEFOLD) != 0) 863 continue; 864 } 865 866 /* have a group specifier */ 867 if ((p = strchr(word, ':')) != NULL) { 868 gid_t *groups, *ng; 869 int gsize, i, found; 870 871 if (pw == NULL) 872 continue; /* no match for unknown user */ 873 *p++ = '\0'; 874 groups = NULL; 875 gsize = 16; 876 do { 877 ng = realloc(groups, gsize * sizeof(gid_t)); 878 if (ng == NULL) 879 fatal( 880 "Local resource failure: realloc"); 881 groups = ng; 882 } while (getgrouplist(pw->pw_name, pw->pw_gid, 883 groups, &gsize) == -1); 884 found = 0; 885 for (i = 0; i < gsize; i++) { 886 struct group *g; 887 888 if ((g = getgrgid(groups[i])) == NULL) 889 continue; 890 if (fnmatch(p, g->gr_name, 0) == 0) { 891 found = 1; 892 break; 893 } 894 } 895 free(groups); 896 if (!found) 897 continue; 898 } 899 900 /* check against username glob */ 901 if (fnmatch(word, name, 0) != 0) 902 continue; 903 904 if (perm != NULL && 905 ((strcasecmp(perm, "allow") == 0) || 906 (strcasecmp(perm, "yes") == 0))) 907 retval = 1; 908 else if (perm != NULL && 909 ((strcasecmp(perm, "deny") == 0) || 910 (strcasecmp(perm, "no") == 0))) 911 retval = 0; 912 else 913 retval = !def; 914 if (!EMPTYSTR(class) && retclass != NULL) 915 *retclass = xstrdup(class); 916 free(buf); 917 break; 918 } 919 (void) fclose(fd); 920 return (retval); 921 } 922 923 /* 924 * Check if user is allowed by /etc/ftpusers 925 * returns 1 for yes, 0 for no 926 * 927 * NOTE: needs struct passwd *pw setup (for checkuser()) 928 */ 929 static int 930 checkaccess(const char *name) 931 { 932 933 return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL)); 934 } 935 936 static void 937 login_utmp(const char *line, const char *name, const char *host) 938 { 939 #if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP) 940 struct timeval tv; 941 (void)gettimeofday(&tv, NULL); 942 #endif 943 #ifdef SUPPORT_UTMPX 944 if (doutmp) { 945 (void)memset(&utmpx, 0, sizeof(utmpx)); 946 utmpx.ut_tv = tv; 947 utmpx.ut_pid = getpid(); 948 utmpx.ut_id[0] = 'f'; 949 utmpx.ut_id[1] = 't'; 950 utmpx.ut_id[2] = 'p'; 951 utmpx.ut_id[3] = '*'; 952 utmpx.ut_type = USER_PROCESS; 953 (void)strncpy(utmpx.ut_name, name, sizeof(utmpx.ut_name)); 954 (void)strncpy(utmpx.ut_line, line, sizeof(utmpx.ut_line)); 955 (void)strncpy(utmpx.ut_host, host, sizeof(utmpx.ut_host)); 956 loginx(&utmpx); 957 } 958 if (dowtmp) 959 logwtmpx(line, name, host, 0, USER_PROCESS); 960 #endif 961 #ifdef SUPPORT_UTMP 962 if (doutmp) { 963 (void)memset(&utmp, 0, sizeof(utmp)); 964 (void)time(&utmp.ut_time); 965 (void)strncpy(utmp.ut_name, name, sizeof(utmp.ut_name)); 966 (void)strncpy(utmp.ut_line, line, sizeof(utmp.ut_line)); 967 (void)strncpy(utmp.ut_host, host, sizeof(utmp.ut_host)); 968 ftpd_login(&utmp); 969 } 970 if (dowtmp) 971 ftpd_logwtmp(line, name, host); 972 #endif 973 } 974 975 static void 976 logout_utmp(void) 977 { 978 int okwtmp = dowtmp; 979 if (logged_in) { 980 if (doutmp) { 981 #ifdef SUPPORT_UTMPX 982 okwtmp = logoutx(ttyline, 0, DEAD_PROCESS) & dowtmp; 983 #endif 984 #ifdef SUPPORT_UTMP 985 okwtmp = ftpd_logout(ttyline) & dowtmp; 986 #endif 987 } 988 if (okwtmp) { 989 #ifdef SUPPORT_UTMPX 990 logwtmpx(ttyline, "", "", 0, DEAD_PROCESS); 991 #endif 992 #ifdef SUPPORT_UTMP 993 ftpd_logwtmp(ttyline, "", ""); 994 #endif 995 } 996 } 997 } 998 999 /* 1000 * Terminate login as previous user (if any), resetting state; 1001 * used when USER command is given or login fails. 1002 */ 1003 static void 1004 end_login(void) 1005 { 1006 logout_utmp(); 1007 show_chdir_messages(-1); /* flush chdir cache */ 1008 if (pw != NULL && pw->pw_passwd != NULL) 1009 memset(pw->pw_passwd, 0, strlen(pw->pw_passwd)); 1010 pw = NULL; 1011 logged_in = 0; 1012 askpasswd = 0; 1013 permitted = 0; 1014 quietmessages = 0; 1015 gidcount = 0; 1016 curclass.type = CLASS_REAL; 1017 (void) seteuid((uid_t)0); 1018 } 1019 1020 void 1021 pass(const char *passwd) 1022 { 1023 int rval; 1024 char root[MAXPATHLEN]; 1025 1026 if (logged_in || askpasswd == 0) { 1027 reply(503, "Login with USER first."); 1028 return; 1029 } 1030 askpasswd = 0; 1031 if (curclass.type != CLASS_GUEST) { 1032 /* "ftp" is the only account allowed with no password */ 1033 if (pw == NULL) { 1034 rval = 1; /* failure below */ 1035 goto skip; 1036 } 1037 #if defined(KERBEROS) 1038 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 1039 rval = 0; 1040 goto skip; 1041 } 1042 #endif 1043 #if defined(KERBEROS5) 1044 if (k5login(pw, "", hostname, (char *)passwd) == 0) { 1045 rval = 0; 1046 goto skip; 1047 } 1048 #endif 1049 #ifdef SKEY 1050 if (skey_haskey(pw->pw_name) == 0) { 1051 char *p; 1052 int r; 1053 1054 p = xstrdup(passwd); 1055 r = skey_passcheck(pw->pw_name, p); 1056 free(p); 1057 if (r != -1) { 1058 rval = 0; 1059 goto skip; 1060 } 1061 } 1062 #endif 1063 if (!sflag) 1064 rval = checkpassword(pw, passwd); 1065 else 1066 rval = 1; 1067 1068 skip: 1069 1070 /* 1071 * If rval > 0, the user failed the authentication check 1072 * above. If rval == 0, either Kerberos or local 1073 * authentication succeeded. 1074 */ 1075 if (rval) { 1076 reply(530, "%s", rval == 2 ? "Password expired." : 1077 "Login incorrect."); 1078 if (logging) { 1079 syslog(LOG_NOTICE, 1080 "FTP LOGIN FAILED FROM %s", remotehost); 1081 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1082 "FTP LOGIN FAILED FROM %s, %s", 1083 remotehost, curname); 1084 } 1085 pw = NULL; 1086 if (login_attempts++ >= 5) { 1087 syslog(LOG_NOTICE, 1088 "repeated login failures from %s", 1089 remotehost); 1090 exit(0); 1091 } 1092 return; 1093 } 1094 } 1095 1096 /* password ok; check if anything else prevents login */ 1097 if (! permitted) { 1098 reply(530, "User %s may not use FTP.", pw->pw_name); 1099 if (logging) 1100 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 1101 remotehost, pw->pw_name); 1102 goto bad; 1103 } 1104 1105 login_attempts = 0; /* this time successful */ 1106 if (setegid((gid_t)pw->pw_gid) < 0) { 1107 reply(550, "Can't set gid."); 1108 goto bad; 1109 } 1110 (void) initgroups(pw->pw_name, pw->pw_gid); 1111 /* cache groups for cmds.c::matchgroup() */ 1112 gidcount = getgroups(0, NULL); 1113 if (gidlist) 1114 free(gidlist); 1115 gidlist = malloc(gidcount * sizeof *gidlist); 1116 gidcount = getgroups(gidcount, gidlist); 1117 1118 /* open utmp/wtmp before chroot */ 1119 login_utmp(ttyline, pw->pw_name, remotehost); 1120 1121 logged_in = 1; 1122 1123 connections = 1; 1124 if (dopidfile) 1125 count_users(); 1126 if (curclass.limit != -1 && connections > curclass.limit) { 1127 if (! EMPTYSTR(curclass.limitfile)) 1128 (void)display_file(conffilename(curclass.limitfile), 1129 530); 1130 reply(530, 1131 "User %s access denied, connection limit of " LLF 1132 " reached.", 1133 pw->pw_name, (LLT)curclass.limit); 1134 syslog(LOG_NOTICE, 1135 "Maximum connection limit of " LLF 1136 " for class %s reached, login refused for %s", 1137 (LLT)curclass.limit, curclass.classname, pw->pw_name); 1138 goto bad; 1139 } 1140 1141 homedir[0] = '/'; 1142 switch (curclass.type) { 1143 case CLASS_GUEST: 1144 /* 1145 * We MUST do a chdir() after the chroot. Otherwise 1146 * the old current directory will be accessible as "." 1147 * outside the new root! 1148 */ 1149 format_path(root, 1150 curclass.chroot ? curclass.chroot : 1151 anondir ? anondir : 1152 pw->pw_dir); 1153 format_path(homedir, 1154 curclass.homedir ? curclass.homedir : 1155 "/"); 1156 if (EMPTYSTR(homedir)) 1157 homedir[0] = '/'; 1158 if (EMPTYSTR(root) || chroot(root) < 0) { 1159 syslog(LOG_NOTICE, 1160 "GUEST user %s: can't chroot to %s: %m", 1161 pw->pw_name, root); 1162 goto bad_guest; 1163 } 1164 if (chdir(homedir) < 0) { 1165 syslog(LOG_NOTICE, 1166 "GUEST user %s: can't chdir to %s: %m", 1167 pw->pw_name, homedir); 1168 bad_guest: 1169 reply(550, "Can't set guest privileges."); 1170 goto bad; 1171 } 1172 break; 1173 case CLASS_CHROOT: 1174 format_path(root, 1175 curclass.chroot ? curclass.chroot : 1176 pw->pw_dir); 1177 format_path(homedir, 1178 curclass.homedir ? curclass.homedir : 1179 "/"); 1180 if (EMPTYSTR(homedir)) 1181 homedir[0] = '/'; 1182 if (EMPTYSTR(root) || chroot(root) < 0) { 1183 syslog(LOG_NOTICE, 1184 "CHROOT user %s: can't chroot to %s: %m", 1185 pw->pw_name, root); 1186 goto bad_chroot; 1187 } 1188 if (chdir(homedir) < 0) { 1189 syslog(LOG_NOTICE, 1190 "CHROOT user %s: can't chdir to %s: %m", 1191 pw->pw_name, homedir); 1192 bad_chroot: 1193 reply(550, "Can't change root."); 1194 goto bad; 1195 } 1196 break; 1197 case CLASS_REAL: 1198 /* only chroot REAL if explictly requested */ 1199 if (! EMPTYSTR(curclass.chroot)) { 1200 format_path(root, curclass.chroot); 1201 if (EMPTYSTR(root) || chroot(root) < 0) { 1202 syslog(LOG_NOTICE, 1203 "REAL user %s: can't chroot to %s: %m", 1204 pw->pw_name, root); 1205 goto bad_chroot; 1206 } 1207 } 1208 format_path(homedir, 1209 curclass.homedir ? curclass.homedir : 1210 pw->pw_dir); 1211 if (EMPTYSTR(homedir) || chdir(homedir) < 0) { 1212 if (chdir("/") < 0) { 1213 syslog(LOG_NOTICE, 1214 "REAL user %s: can't chdir to %s: %m", 1215 pw->pw_name, 1216 !EMPTYSTR(homedir) ? homedir : "/"); 1217 reply(530, 1218 "User %s: can't change directory to %s.", 1219 pw->pw_name, 1220 !EMPTYSTR(homedir) ? homedir : "/"); 1221 goto bad; 1222 } else { 1223 reply(-230, 1224 "No directory! Logging in with home=/"); 1225 homedir[0] = '/'; 1226 } 1227 } 1228 break; 1229 } 1230 setsid(); 1231 setlogin(pw->pw_name); 1232 if (dropprivs || 1233 (curclass.type != CLASS_REAL && 1234 ntohs(ctrl_addr.su_port) > IPPORT_RESERVED + 1)) { 1235 dropprivs++; 1236 if (setgid((gid_t)pw->pw_gid) < 0) { 1237 reply(550, "Can't set gid."); 1238 goto bad; 1239 } 1240 if (setuid((uid_t)pw->pw_uid) < 0) { 1241 reply(550, "Can't set uid."); 1242 goto bad; 1243 } 1244 } else { 1245 if (seteuid((uid_t)pw->pw_uid) < 0) { 1246 reply(550, "Can't set uid."); 1247 goto bad; 1248 } 1249 } 1250 setenv("HOME", homedir, 1); 1251 1252 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 1253 quietmessages = 1; 1254 1255 /* 1256 * Display a login message, if it exists. 1257 * N.B. reply(230,) must follow the message. 1258 */ 1259 if (! EMPTYSTR(curclass.motd)) 1260 (void)display_file(conffilename(curclass.motd), 230); 1261 show_chdir_messages(230); 1262 if (curclass.type == CLASS_GUEST) { 1263 char *p; 1264 1265 reply(230, "Guest login ok, access restrictions apply."); 1266 #if HAVE_SETPROCTITLE 1267 snprintf(proctitle, sizeof(proctitle), 1268 "%s: anonymous/%s", remotehost, passwd); 1269 setproctitle("%s", proctitle); 1270 #endif /* HAVE_SETPROCTITLE */ 1271 if (logging) 1272 syslog(LOG_INFO, 1273 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 1274 remotehost, passwd, 1275 curclass.classname, CURCLASSTYPE); 1276 /* store guest password reply into pw_passwd */ 1277 REASSIGN(pw->pw_passwd, xstrdup(passwd)); 1278 for (p = pw->pw_passwd; *p; p++) 1279 if (!isgraph(*p)) 1280 *p = '_'; 1281 } else { 1282 reply(230, "User %s logged in.", pw->pw_name); 1283 #if HAVE_SETPROCTITLE 1284 snprintf(proctitle, sizeof(proctitle), 1285 "%s: %s", remotehost, pw->pw_name); 1286 setproctitle("%s", proctitle); 1287 #endif /* HAVE_SETPROCTITLE */ 1288 if (logging) 1289 syslog(LOG_INFO, 1290 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1291 remotehost, pw->pw_name, 1292 curclass.classname, CURCLASSTYPE); 1293 } 1294 (void) umask(curclass.umask); 1295 return; 1296 1297 bad: 1298 /* Forget all about it... */ 1299 end_login(); 1300 } 1301 1302 void 1303 retrieve(char *argv[], const char *name) 1304 { 1305 FILE *fin, *dout; 1306 struct stat st; 1307 int (*closefunc)(FILE *) = NULL; 1308 int dolog, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1309 struct timeval start, finish, td, *tdp; 1310 struct rusage rusage_before, rusage_after; 1311 const char *dispname; 1312 char *error; 1313 1314 sendrv = closerv = stderrfd = -1; 1315 isconversion = isdata = isls = dolog = 0; 1316 tdp = NULL; 1317 dispname = name; 1318 fin = dout = NULL; 1319 error = NULL; 1320 if (argv == NULL) { /* if not running a command ... */ 1321 dolog = 1; 1322 isdata = 1; 1323 fin = fopen(name, "r"); 1324 closefunc = fclose; 1325 if (fin == NULL) /* doesn't exist?; try a conversion */ 1326 argv = do_conversion(name); 1327 if (argv != NULL) { 1328 isconversion++; 1329 syslog(LOG_DEBUG, "get command: '%s' on '%s'", 1330 argv[0], name); 1331 } 1332 } 1333 if (argv != NULL) { 1334 char temp[MAXPATHLEN]; 1335 1336 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1337 isls = 1; 1338 stderrfd = -1; 1339 } else { 1340 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1341 stderrfd = mkstemp(temp); 1342 if (stderrfd != -1) 1343 (void)unlink(temp); 1344 } 1345 dispname = argv[0]; 1346 fin = ftpd_popen(argv, "r", stderrfd); 1347 closefunc = ftpd_pclose; 1348 st.st_size = -1; 1349 st.st_blksize = BUFSIZ; 1350 } 1351 if (fin == NULL) { 1352 if (errno != 0) { 1353 perror_reply(550, dispname); 1354 if (dolog) 1355 logxfer("get", -1, name, NULL, NULL, 1356 strerror(errno)); 1357 } 1358 goto cleanupretrieve; 1359 } 1360 byte_count = -1; 1361 if (argv == NULL 1362 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1363 error = "Not a plain file"; 1364 reply(550, "%s: %s.", dispname, error); 1365 goto done; 1366 } 1367 if (restart_point) { 1368 if (type == TYPE_A) { 1369 off_t i; 1370 int c; 1371 1372 for (i = 0; i < restart_point; i++) { 1373 if ((c=getc(fin)) == EOF) { 1374 error = strerror(errno); 1375 perror_reply(550, dispname); 1376 goto done; 1377 } 1378 if (c == '\n') 1379 i++; 1380 } 1381 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1382 error = strerror(errno); 1383 perror_reply(550, dispname); 1384 goto done; 1385 } 1386 } 1387 dout = dataconn(dispname, st.st_size, "w"); 1388 if (dout == NULL) 1389 goto done; 1390 1391 (void)getrusage(RUSAGE_SELF, &rusage_before); 1392 (void)gettimeofday(&start, NULL); 1393 sendrv = send_data(fin, dout, &st, isdata); 1394 (void)gettimeofday(&finish, NULL); 1395 (void)getrusage(RUSAGE_SELF, &rusage_after); 1396 closedataconn(dout); /* close now to affect timing stats */ 1397 timersub(&finish, &start, &td); 1398 tdp = &td; 1399 done: 1400 if (dolog) { 1401 logxfer("get", byte_count, name, NULL, tdp, error); 1402 if (tdp != NULL) 1403 logrusage(&rusage_before, &rusage_after); 1404 } 1405 closerv = (*closefunc)(fin); 1406 if (sendrv == 0) { 1407 FILE *errf; 1408 struct stat sb; 1409 1410 if (!isls && argv != NULL && closerv != 0) { 1411 reply(-226, 1412 "Command returned an exit status of %d", 1413 closerv); 1414 if (isconversion) 1415 syslog(LOG_WARNING, 1416 "retrieve command: '%s' returned %d", 1417 argv[0], closerv); 1418 } 1419 if (!isls && argv != NULL && stderrfd != -1 && 1420 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1421 ((errf = fdopen(stderrfd, "r")) != NULL)) { 1422 char *cp, line[LINE_MAX]; 1423 1424 reply(-226, "Command error messages:"); 1425 rewind(errf); 1426 while (fgets(line, sizeof(line), errf) != NULL) { 1427 if ((cp = strchr(line, '\n')) != NULL) 1428 *cp = '\0'; 1429 reply(0, " %s", line); 1430 } 1431 (void) fflush(stdout); 1432 (void) fclose(errf); 1433 /* a reply(226,) must follow */ 1434 } 1435 reply(226, "Transfer complete."); 1436 } 1437 cleanupretrieve: 1438 if (stderrfd != -1) 1439 (void)close(stderrfd); 1440 if (isconversion) 1441 free(argv); 1442 } 1443 1444 void 1445 store(const char *name, const char *fmode, int unique) 1446 { 1447 FILE *fout, *din; 1448 struct stat st; 1449 int (*closefunc)(FILE *); 1450 struct timeval start, finish, td, *tdp; 1451 char *desc, *error; 1452 1453 din = NULL; 1454 desc = (*fmode == 'w') ? "put" : "append"; 1455 error = NULL; 1456 if (unique && stat(name, &st) == 0 && 1457 (name = gunique(name)) == NULL) { 1458 logxfer(desc, -1, name, NULL, NULL, 1459 "cannot create unique file"); 1460 goto cleanupstore; 1461 } 1462 1463 if (restart_point) 1464 fmode = "r+"; 1465 fout = fopen(name, fmode); 1466 closefunc = fclose; 1467 tdp = NULL; 1468 if (fout == NULL) { 1469 perror_reply(553, name); 1470 logxfer(desc, -1, name, NULL, NULL, strerror(errno)); 1471 goto cleanupstore; 1472 } 1473 byte_count = -1; 1474 if (restart_point) { 1475 if (type == TYPE_A) { 1476 off_t i; 1477 int c; 1478 1479 for (i = 0; i < restart_point; i++) { 1480 if ((c=getc(fout)) == EOF) { 1481 error = strerror(errno); 1482 perror_reply(550, name); 1483 goto done; 1484 } 1485 if (c == '\n') 1486 i++; 1487 } 1488 /* 1489 * We must do this seek to "current" position 1490 * because we are changing from reading to 1491 * writing. 1492 */ 1493 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1494 error = strerror(errno); 1495 perror_reply(550, name); 1496 goto done; 1497 } 1498 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1499 error = strerror(errno); 1500 perror_reply(550, name); 1501 goto done; 1502 } 1503 } 1504 din = dataconn(name, (off_t)-1, "r"); 1505 if (din == NULL) 1506 goto done; 1507 (void)gettimeofday(&start, NULL); 1508 if (receive_data(din, fout) == 0) { 1509 if (unique) 1510 reply(226, "Transfer complete (unique file name:%s).", 1511 name); 1512 else 1513 reply(226, "Transfer complete."); 1514 } 1515 (void)gettimeofday(&finish, NULL); 1516 closedataconn(din); /* close now to affect timing stats */ 1517 timersub(&finish, &start, &td); 1518 tdp = &td; 1519 done: 1520 logxfer(desc, byte_count, name, NULL, tdp, error); 1521 (*closefunc)(fout); 1522 cleanupstore: 1523 ; 1524 } 1525 1526 static FILE * 1527 getdatasock(const char *fmode) 1528 { 1529 int on, s, t, tries; 1530 in_port_t port; 1531 1532 on = 1; 1533 if (data >= 0) 1534 return (fdopen(data, fmode)); 1535 if (! dropprivs) 1536 (void) seteuid((uid_t)0); 1537 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1538 if (s < 0) 1539 goto bad; 1540 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1541 (char *) &on, sizeof(on)) < 0) 1542 goto bad; 1543 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1544 (char *) &on, sizeof(on)) < 0) 1545 goto bad; 1546 /* anchor socket to avoid multi-homing problems */ 1547 data_source = ctrl_addr; 1548 /* 1549 * By default source port for PORT connctions is 1550 * ctrlport-1 (see RFC959 section 5.2). 1551 * However, if privs have been dropped and that 1552 * would be < IPPORT_RESERVED, use a random port 1553 * instead. 1554 */ 1555 if (dataport) 1556 port = dataport; 1557 else 1558 port = ntohs(ctrl_addr.su_port) - 1; 1559 if (dropprivs && port < IPPORT_RESERVED) 1560 port = 0; /* use random port */ 1561 data_source.su_port = htons(port); 1562 1563 for (tries = 1; ; tries++) { 1564 if (bind(s, (struct sockaddr *)&data_source.si_su, 1565 data_source.su_len) >= 0) 1566 break; 1567 if (errno != EADDRINUSE || tries > 10) 1568 goto bad; 1569 sleep(tries); 1570 } 1571 if (! dropprivs) 1572 (void) seteuid((uid_t)pw->pw_uid); 1573 #ifdef IP_TOS 1574 if (!mapped && ctrl_addr.su_family == AF_INET) { 1575 on = IPTOS_THROUGHPUT; 1576 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1577 sizeof(int)) < 0) 1578 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1579 } 1580 #endif 1581 return (fdopen(s, fmode)); 1582 bad: 1583 /* Return the real value of errno (close may change it) */ 1584 t = errno; 1585 if (! dropprivs) 1586 (void) seteuid((uid_t)pw->pw_uid); 1587 (void) close(s); 1588 errno = t; 1589 return (NULL); 1590 } 1591 1592 FILE * 1593 dataconn(const char *name, off_t size, const char *fmode) 1594 { 1595 char sizebuf[32]; 1596 FILE *file; 1597 int retry, tos, keepalive, conerrno; 1598 1599 file_size = size; 1600 byte_count = 0; 1601 if (size != (off_t) -1) 1602 (void)snprintf(sizebuf, sizeof(sizebuf), " (" LLF " byte%s)", 1603 (LLT)size, PLURAL(size)); 1604 else 1605 sizebuf[0] = '\0'; 1606 if (pdata >= 0) { 1607 struct sockinet from; 1608 int s, fromlen = sizeof(from.su_len); 1609 1610 (void) alarm(curclass.timeout); 1611 s = accept(pdata, (struct sockaddr *)&from.si_su, &fromlen); 1612 (void) alarm(0); 1613 if (s < 0) { 1614 reply(425, "Can't open data connection."); 1615 (void) close(pdata); 1616 pdata = -1; 1617 return (NULL); 1618 } 1619 (void) close(pdata); 1620 pdata = s; 1621 switch (from.su_family) { 1622 case AF_INET: 1623 #ifdef IP_TOS 1624 if (!mapped) { 1625 tos = IPTOS_THROUGHPUT; 1626 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1627 (char *)&tos, sizeof(int)); 1628 } 1629 break; 1630 #endif 1631 } 1632 /* Set keepalives on the socket to detect dropped conns. */ 1633 #ifdef SO_KEEPALIVE 1634 keepalive = 1; 1635 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1636 (char *)&keepalive, sizeof(int)); 1637 #endif 1638 reply(150, "Opening %s mode data connection for '%s'%s.", 1639 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1640 return (fdopen(pdata, fmode)); 1641 } 1642 if (data >= 0) { 1643 reply(125, "Using existing data connection for '%s'%s.", 1644 name, sizebuf); 1645 usedefault = 1; 1646 return (fdopen(data, fmode)); 1647 } 1648 if (usedefault) 1649 data_dest = his_addr; 1650 usedefault = 1; 1651 retry = conerrno = 0; 1652 do { 1653 file = getdatasock(fmode); 1654 if (file == NULL) { 1655 char hbuf[NI_MAXHOST]; 1656 char pbuf[NI_MAXSERV]; 1657 1658 if (getnameinfo((struct sockaddr *)&data_source.si_su, 1659 data_source.su_len, hbuf, sizeof(hbuf), pbuf, 1660 sizeof(pbuf), NI_NUMERICHOST | NI_NUMERICSERV)) 1661 strlcpy(hbuf, "?", sizeof(hbuf)); 1662 reply(425, "Can't create data socket (%s,%s): %s.", 1663 hbuf, pbuf, strerror(errno)); 1664 return (NULL); 1665 } 1666 data = fileno(file); 1667 conerrno = 0; 1668 if (connect(data, (struct sockaddr *)&data_dest.si_su, 1669 data_dest.su_len) == 0) 1670 break; 1671 conerrno = errno; 1672 (void) fclose(file); 1673 data = -1; 1674 if (conerrno == EADDRINUSE) { 1675 sleep((unsigned) swaitint); 1676 retry += swaitint; 1677 } else { 1678 break; 1679 } 1680 } while (retry <= swaitmax); 1681 if (conerrno != 0) { 1682 perror_reply(425, "Can't build data connection"); 1683 return (NULL); 1684 } 1685 reply(150, "Opening %s mode data connection for '%s'%s.", 1686 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1687 return (file); 1688 } 1689 1690 void 1691 closedataconn(FILE *fd) 1692 { 1693 1694 if (fd == NULL) 1695 return; 1696 (void)fclose(fd); 1697 data = -1; 1698 if (pdata >= 0) 1699 (void)close(pdata); 1700 pdata = -1; 1701 } 1702 1703 int 1704 write_data(int fd, char *buf, size_t size, off_t *bufrem, 1705 struct timeval *then, int isdata) 1706 { 1707 struct timeval now, td; 1708 ssize_t c; 1709 1710 while (size > 0) { 1711 c = size; 1712 if (curclass.writesize) { 1713 if (curclass.writesize < c) 1714 c = curclass.writesize; 1715 } 1716 if (curclass.rateget) { 1717 if (*bufrem < c) 1718 c = *bufrem; 1719 } 1720 (void) alarm(curclass.timeout); 1721 c = write(fd, buf, c); 1722 if (c <= 0) 1723 return (1); 1724 buf += c; 1725 size -= c; 1726 byte_count += c; 1727 if (isdata) { 1728 total_data_out += c; 1729 total_data += c; 1730 } 1731 total_bytes_out += c; 1732 total_bytes += c; 1733 if (curclass.rateget) { 1734 *bufrem -= c; 1735 if (*bufrem == 0) { 1736 (void)gettimeofday(&now, NULL); 1737 timersub(&now, then, &td); 1738 if (td.tv_sec == 0) { 1739 usleep(1000000 - td.tv_usec); 1740 (void)gettimeofday(then, NULL); 1741 } else 1742 *then = now; 1743 *bufrem = curclass.rateget; 1744 } 1745 } 1746 } 1747 return (0); 1748 } 1749 1750 static enum send_status 1751 send_data_with_read(int filefd, int netfd, const struct stat *st, int isdata) 1752 { 1753 struct timeval then; 1754 off_t bufrem; 1755 size_t readsize; 1756 char *buf; 1757 int c, error; 1758 1759 if (curclass.readsize) 1760 readsize = curclass.readsize; 1761 else 1762 readsize = (size_t)st->st_blksize; 1763 if ((buf = malloc(readsize)) == NULL) { 1764 perror_reply(451, "Local resource failure: malloc"); 1765 return (SS_NO_TRANSFER); 1766 } 1767 1768 if (curclass.rateget) { 1769 bufrem = curclass.rateget; 1770 (void)gettimeofday(&then, NULL); 1771 } 1772 while (1) { 1773 (void) alarm(curclass.timeout); 1774 c = read(filefd, buf, readsize); 1775 if (c == 0) 1776 error = SS_SUCCESS; 1777 else if (c < 0) 1778 error = SS_FILE_ERROR; 1779 else if (write_data(netfd, buf, c, &bufrem, &then, isdata)) 1780 error = SS_DATA_ERROR; 1781 else 1782 continue; 1783 1784 free(buf); 1785 return (error); 1786 } 1787 } 1788 1789 static enum send_status 1790 send_data_with_mmap(int filefd, int netfd, const struct stat *st, int isdata) 1791 { 1792 struct timeval then; 1793 off_t bufrem, filesize, off, origoff; 1794 size_t mapsize, winsize; 1795 int error, sendbufsize, sendlowat; 1796 void *win; 1797 1798 if (curclass.sendbufsize) { 1799 sendbufsize = curclass.sendbufsize; 1800 if (setsockopt(netfd, SOL_SOCKET, SO_SNDBUF, 1801 &sendbufsize, sizeof(int)) == -1) 1802 syslog(LOG_WARNING, "setsockopt(SO_SNDBUF, %d): %m", 1803 sendbufsize); 1804 } 1805 1806 if (curclass.sendlowat) { 1807 sendlowat = curclass.sendlowat; 1808 if (setsockopt(netfd, SOL_SOCKET, SO_SNDLOWAT, 1809 &sendlowat, sizeof(int)) == -1) 1810 syslog(LOG_WARNING, "setsockopt(SO_SNDLOWAT, %d): %m", 1811 sendlowat); 1812 } 1813 1814 winsize = curclass.mmapsize; 1815 filesize = st->st_size; 1816 if (debug) 1817 syslog(LOG_INFO, "mmapsize = %ld, writesize = %ld", 1818 (long)winsize, (long)curclass.writesize); 1819 if (winsize == 0) 1820 goto try_read; 1821 1822 off = lseek(filefd, (off_t)0, SEEK_CUR); 1823 if (off == -1) 1824 goto try_read; 1825 1826 origoff = off; 1827 if (curclass.rateget) { 1828 bufrem = curclass.rateget; 1829 (void)gettimeofday(&then, NULL); 1830 } 1831 while (1) { 1832 mapsize = MIN(filesize - off, winsize); 1833 if (mapsize == 0) 1834 break; 1835 win = mmap(NULL, mapsize, PROT_READ, 1836 MAP_FILE|MAP_SHARED, filefd, off); 1837 if (win == MAP_FAILED) { 1838 if (off == origoff) 1839 goto try_read; 1840 return (SS_FILE_ERROR); 1841 } 1842 (void) madvise(win, mapsize, MADV_SEQUENTIAL); 1843 error = write_data(netfd, win, mapsize, &bufrem, &then, 1844 isdata); 1845 (void) madvise(win, mapsize, MADV_DONTNEED); 1846 munmap(win, mapsize); 1847 if (error) 1848 return (SS_DATA_ERROR); 1849 off += mapsize; 1850 } 1851 return (SS_SUCCESS); 1852 1853 try_read: 1854 return (send_data_with_read(filefd, netfd, st, isdata)); 1855 } 1856 1857 /* 1858 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1859 * encapsulation of the data subject to Mode, Structure, and Type. 1860 * 1861 * NB: Form isn't handled. 1862 */ 1863 static int 1864 send_data(FILE *instr, FILE *outstr, const struct stat *st, int isdata) 1865 { 1866 int c, filefd, netfd, rval; 1867 1868 transflag = 1; 1869 rval = -1; 1870 if (setjmp(urgcatch)) 1871 goto cleanup_send_data; 1872 1873 switch (type) { 1874 1875 case TYPE_A: 1876 /* XXXLUKEM: rate limit ascii send (get) */ 1877 (void) alarm(curclass.timeout); 1878 while ((c = getc(instr)) != EOF) { 1879 byte_count++; 1880 if (c == '\n') { 1881 if (ferror(outstr)) 1882 goto data_err; 1883 (void) putc('\r', outstr); 1884 if (isdata) { 1885 total_data_out++; 1886 total_data++; 1887 } 1888 total_bytes_out++; 1889 total_bytes++; 1890 } 1891 (void) putc(c, outstr); 1892 if (isdata) { 1893 total_data_out++; 1894 total_data++; 1895 } 1896 total_bytes_out++; 1897 total_bytes++; 1898 if ((byte_count % 4096) == 0) 1899 (void) alarm(curclass.timeout); 1900 } 1901 (void) alarm(0); 1902 fflush(outstr); 1903 if (ferror(instr)) 1904 goto file_err; 1905 if (ferror(outstr)) 1906 goto data_err; 1907 rval = 0; 1908 goto cleanup_send_data; 1909 1910 case TYPE_I: 1911 case TYPE_L: 1912 filefd = fileno(instr); 1913 netfd = fileno(outstr); 1914 switch (send_data_with_mmap(filefd, netfd, st, isdata)) { 1915 1916 case SS_SUCCESS: 1917 break; 1918 1919 case SS_NO_TRANSFER: 1920 goto cleanup_send_data; 1921 1922 case SS_FILE_ERROR: 1923 goto file_err; 1924 1925 case SS_DATA_ERROR: 1926 goto data_err; 1927 } 1928 rval = 0; 1929 goto cleanup_send_data; 1930 1931 default: 1932 reply(550, "Unimplemented TYPE %d in send_data", type); 1933 goto cleanup_send_data; 1934 } 1935 1936 data_err: 1937 (void) alarm(0); 1938 perror_reply(426, "Data connection"); 1939 goto cleanup_send_data; 1940 1941 file_err: 1942 (void) alarm(0); 1943 perror_reply(551, "Error on input file"); 1944 /* FALLTHROUGH */ 1945 1946 cleanup_send_data: 1947 (void) alarm(0); 1948 transflag = 0; 1949 if (isdata) { 1950 total_files_out++; 1951 total_files++; 1952 } 1953 total_xfers_out++; 1954 total_xfers++; 1955 return (rval); 1956 } 1957 1958 /* 1959 * Transfer data from peer to "outstr" using the appropriate encapulation of 1960 * the data subject to Mode, Structure, and Type. 1961 * 1962 * N.B.: Form isn't handled. 1963 */ 1964 static int 1965 receive_data(FILE *instr, FILE *outstr) 1966 { 1967 int c, bare_lfs, netfd, filefd, rval; 1968 off_t byteswritten; 1969 char buf[BUFSIZ]; 1970 #ifdef __GNUC__ 1971 (void) &bare_lfs; 1972 #endif 1973 1974 bare_lfs = 0; 1975 transflag = 1; 1976 rval = -1; 1977 byteswritten = 0; 1978 if (setjmp(urgcatch)) 1979 goto cleanup_recv_data; 1980 1981 #define FILESIZECHECK(x) \ 1982 do { \ 1983 if (curclass.maxfilesize != -1 && \ 1984 (x) > curclass.maxfilesize) { \ 1985 errno = EFBIG; \ 1986 goto file_err; \ 1987 } \ 1988 } while (0) 1989 1990 switch (type) { 1991 1992 case TYPE_I: 1993 case TYPE_L: 1994 netfd = fileno(instr); 1995 filefd = fileno(outstr); 1996 (void) alarm(curclass.timeout); 1997 if (curclass.rateput) { 1998 while (1) { 1999 int d; 2000 struct timeval then, now, td; 2001 off_t bufrem; 2002 2003 (void)gettimeofday(&then, NULL); 2004 errno = c = d = 0; 2005 for (bufrem = curclass.rateput; bufrem > 0; ) { 2006 if ((c = read(netfd, buf, 2007 MIN(sizeof(buf), bufrem))) <= 0) 2008 goto recvdone; 2009 FILESIZECHECK(byte_count + c); 2010 if ((d = write(filefd, buf, c)) != c) 2011 goto file_err; 2012 (void) alarm(curclass.timeout); 2013 bufrem -= c; 2014 byte_count += c; 2015 total_data_in += c; 2016 total_data += c; 2017 total_bytes_in += c; 2018 total_bytes += c; 2019 } 2020 (void)gettimeofday(&now, NULL); 2021 timersub(&now, &then, &td); 2022 if (td.tv_sec == 0) 2023 usleep(1000000 - td.tv_usec); 2024 } 2025 } else { 2026 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 2027 FILESIZECHECK(byte_count + c); 2028 if (write(filefd, buf, c) != c) 2029 goto file_err; 2030 (void) alarm(curclass.timeout); 2031 byte_count += c; 2032 total_data_in += c; 2033 total_data += c; 2034 total_bytes_in += c; 2035 total_bytes += c; 2036 } 2037 } 2038 recvdone: 2039 if (c < 0) 2040 goto data_err; 2041 rval = 0; 2042 goto cleanup_recv_data; 2043 2044 case TYPE_E: 2045 reply(553, "TYPE E not implemented."); 2046 goto cleanup_recv_data; 2047 2048 case TYPE_A: 2049 (void) alarm(curclass.timeout); 2050 /* XXXLUKEM: rate limit ascii receive (put) */ 2051 while ((c = getc(instr)) != EOF) { 2052 byte_count++; 2053 total_data_in++; 2054 total_data++; 2055 total_bytes_in++; 2056 total_bytes++; 2057 if ((byte_count % 4096) == 0) 2058 (void) alarm(curclass.timeout); 2059 if (c == '\n') 2060 bare_lfs++; 2061 while (c == '\r') { 2062 if (ferror(outstr)) 2063 goto data_err; 2064 if ((c = getc(instr)) != '\n') { 2065 byte_count++; 2066 total_data_in++; 2067 total_data++; 2068 total_bytes_in++; 2069 total_bytes++; 2070 if ((byte_count % 4096) == 0) 2071 (void) alarm(curclass.timeout); 2072 byteswritten++; 2073 FILESIZECHECK(byteswritten); 2074 (void) putc ('\r', outstr); 2075 if (c == '\0' || c == EOF) 2076 goto contin2; 2077 } 2078 } 2079 byteswritten++; 2080 FILESIZECHECK(byteswritten); 2081 (void) putc(c, outstr); 2082 contin2: ; 2083 } 2084 (void) alarm(0); 2085 fflush(outstr); 2086 if (ferror(instr)) 2087 goto data_err; 2088 if (ferror(outstr)) 2089 goto file_err; 2090 if (bare_lfs) { 2091 reply(-226, 2092 "WARNING! %d bare linefeeds received in ASCII mode", 2093 bare_lfs); 2094 reply(0, "File may not have transferred correctly."); 2095 } 2096 rval = 0; 2097 goto cleanup_recv_data; 2098 2099 default: 2100 reply(550, "Unimplemented TYPE %d in receive_data", type); 2101 goto cleanup_recv_data; 2102 } 2103 #undef FILESIZECHECK 2104 2105 data_err: 2106 (void) alarm(0); 2107 perror_reply(426, "Data Connection"); 2108 goto cleanup_recv_data; 2109 2110 file_err: 2111 (void) alarm(0); 2112 perror_reply(452, "Error writing file"); 2113 goto cleanup_recv_data; 2114 2115 cleanup_recv_data: 2116 (void) alarm(0); 2117 transflag = 0; 2118 total_files_in++; 2119 total_files++; 2120 total_xfers_in++; 2121 total_xfers++; 2122 return (rval); 2123 } 2124 2125 void 2126 statcmd(void) 2127 { 2128 struct sockinet *su = NULL; 2129 static char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV]; 2130 u_char *a, *p; 2131 int ispassive, af; 2132 off_t otbi, otbo, otb; 2133 2134 a = p = (u_char *)NULL; 2135 2136 reply(-211, "%s FTP server status:", hostname); 2137 reply(0, "Version: %s", EMPTYSTR(version) ? "<suppressed>" : version); 2138 hbuf[0] = '\0'; 2139 if (!getnameinfo((struct sockaddr *)&his_addr.si_su, his_addr.su_len, 2140 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) 2141 && strcmp(remotehost, hbuf) != 0) 2142 reply(0, "Connected to %s (%s)", remotehost, hbuf); 2143 else 2144 reply(0, "Connected to %s", remotehost); 2145 2146 if (logged_in) { 2147 if (curclass.type == CLASS_GUEST) 2148 reply(0, "Logged in anonymously"); 2149 else 2150 reply(0, "Logged in as %s%s", pw->pw_name, 2151 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 2152 } else if (askpasswd) 2153 reply(0, "Waiting for password"); 2154 else 2155 reply(0, "Waiting for user name"); 2156 cprintf(stdout, " TYPE: %s", typenames[type]); 2157 if (type == TYPE_A || type == TYPE_E) 2158 cprintf(stdout, ", FORM: %s", formnames[form]); 2159 if (type == TYPE_L) { 2160 #if NBBY == 8 2161 cprintf(stdout, " %d", NBBY); 2162 #else 2163 /* XXX: `bytesize' needs to be defined in this case */ 2164 cprintf(stdout, " %d", bytesize); 2165 #endif 2166 } 2167 cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n", 2168 strunames[stru], modenames[mode]); 2169 ispassive = 0; 2170 if (data != -1) { 2171 reply(0, "Data connection open"); 2172 su = NULL; 2173 } else if (pdata != -1) { 2174 reply(0, "in Passive mode"); 2175 if (curclass.advertise.su_len != 0) 2176 su = &curclass.advertise; 2177 else 2178 su = &pasv_addr; 2179 ispassive = 1; 2180 goto printaddr; 2181 } else if (usedefault == 0) { 2182 if (epsvall) { 2183 reply(0, "EPSV only mode (EPSV ALL)"); 2184 goto epsvonly; 2185 } 2186 su = (struct sockinet *)&data_dest; 2187 printaddr: 2188 /* PASV/PORT */ 2189 if (su->su_family == AF_INET) { 2190 a = (u_char *) &su->su_addr; 2191 p = (u_char *) &su->su_port; 2192 #define UC(b) (((int) b) & 0xff) 2193 reply(0, "%s (%d,%d,%d,%d,%d,%d)", 2194 ispassive ? "PASV" : "PORT" , 2195 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2196 UC(p[0]), UC(p[1])); 2197 } 2198 2199 /* LPSV/LPRT */ 2200 { 2201 int alen, i; 2202 2203 alen = 0; 2204 switch (su->su_family) { 2205 case AF_INET: 2206 a = (u_char *) &su->su_addr; 2207 p = (u_char *) &su->su_port; 2208 alen = sizeof(su->su_addr); 2209 af = 4; 2210 break; 2211 #ifdef INET6 2212 case AF_INET6: 2213 a = (u_char *) &su->su_6addr; 2214 p = (u_char *) &su->su_port; 2215 alen = sizeof(su->su_6addr); 2216 af = 6; 2217 break; 2218 #endif 2219 default: 2220 af = 0; 2221 break; 2222 } 2223 if (af) { 2224 cprintf(stdout, " %s (%d,%d", 2225 ispassive ? "LPSV" : "LPRT", af, alen); 2226 for (i = 0; i < alen; i++) 2227 cprintf(stdout, ",%d", UC(a[i])); 2228 cprintf(stdout, ",%d,%d,%d)\r\n", 2229 2, UC(p[0]), UC(p[1])); 2230 #undef UC 2231 } 2232 } 2233 2234 /* EPRT/EPSV */ 2235 epsvonly: 2236 af = af2epsvproto(su->su_family); 2237 hbuf[0] = '\0'; 2238 if (af > 0) { 2239 struct sockinet tmp; 2240 2241 tmp = *su; 2242 #ifdef INET6 2243 if (tmp.su_family == AF_INET6) 2244 tmp.su_scope_id = 0; 2245 #endif 2246 if (getnameinfo((struct sockaddr *)&tmp.si_su, 2247 tmp.su_len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), 2248 NI_NUMERICHOST | NI_NUMERICSERV) == 0) 2249 reply(0, "%s (|%d|%s|%s|)", 2250 ispassive ? "EPSV" : "EPRT", 2251 af, hbuf, sbuf); 2252 } 2253 } else 2254 reply(0, "No data connection"); 2255 2256 if (logged_in) { 2257 reply(0, 2258 "Data sent: " LLF " byte%s in " LLF " file%s", 2259 (LLT)total_data_out, PLURAL(total_data_out), 2260 (LLT)total_files_out, PLURAL(total_files_out)); 2261 reply(0, 2262 "Data received: " LLF " byte%s in " LLF " file%s", 2263 (LLT)total_data_in, PLURAL(total_data_in), 2264 (LLT)total_files_in, PLURAL(total_files_in)); 2265 reply(0, 2266 "Total data: " LLF " byte%s in " LLF " file%s", 2267 (LLT)total_data, PLURAL(total_data), 2268 (LLT)total_files, PLURAL(total_files)); 2269 } 2270 otbi = total_bytes_in; 2271 otbo = total_bytes_out; 2272 otb = total_bytes; 2273 reply(0, "Traffic sent: " LLF " byte%s in " LLF " transfer%s", 2274 (LLT)otbo, PLURAL(otbo), 2275 (LLT)total_xfers_out, PLURAL(total_xfers_out)); 2276 reply(0, "Traffic received: " LLF " byte%s in " LLF " transfer%s", 2277 (LLT)otbi, PLURAL(otbi), 2278 (LLT)total_xfers_in, PLURAL(total_xfers_in)); 2279 reply(0, "Total traffic: " LLF " byte%s in " LLF " transfer%s", 2280 (LLT)otb, PLURAL(otb), 2281 (LLT)total_xfers, PLURAL(total_xfers)); 2282 2283 if (logged_in && !CURCLASS_FLAGS_ISSET(private)) { 2284 struct ftpconv *cp; 2285 2286 reply(0, "%s", ""); 2287 reply(0, "Class: %s, type: %s", 2288 curclass.classname, CURCLASSTYPE); 2289 reply(0, "Check PORT/LPRT commands: %sabled", 2290 CURCLASS_FLAGS_ISSET(checkportcmd) ? "en" : "dis"); 2291 if (! EMPTYSTR(curclass.display)) 2292 reply(0, "Display file: %s", curclass.display); 2293 if (! EMPTYSTR(curclass.notify)) 2294 reply(0, "Notify fileglob: %s", curclass.notify); 2295 reply(0, "Idle timeout: " LLF ", maximum timeout: " LLF, 2296 (LLT)curclass.timeout, (LLT)curclass.maxtimeout); 2297 reply(0, "Current connections: %d", connections); 2298 if (curclass.limit == -1) 2299 reply(0, "Maximum connections: unlimited"); 2300 else 2301 reply(0, "Maximum connections: " LLF, 2302 (LLT)curclass.limit); 2303 if (curclass.limitfile) 2304 reply(0, "Connection limit exceeded message file: %s", 2305 conffilename(curclass.limitfile)); 2306 if (! EMPTYSTR(curclass.chroot)) 2307 reply(0, "Chroot format: %s", curclass.chroot); 2308 reply(0, "Deny bad ftpusers(5) quickly: %sabled", 2309 CURCLASS_FLAGS_ISSET(denyquick) ? "en" : "dis"); 2310 if (! EMPTYSTR(curclass.homedir)) 2311 reply(0, "Homedir format: %s", curclass.homedir); 2312 if (curclass.maxfilesize == -1) 2313 reply(0, "Maximum file size: unlimited"); 2314 else 2315 reply(0, "Maximum file size: " LLF, 2316 (LLT)curclass.maxfilesize); 2317 if (! EMPTYSTR(curclass.motd)) 2318 reply(0, "MotD file: %s", conffilename(curclass.motd)); 2319 reply(0, 2320 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 2321 CURCLASS_FLAGS_ISSET(modify) ? "en" : "dis"); 2322 reply(0, "Upload commands (APPE, STOR, STOU): %sabled", 2323 CURCLASS_FLAGS_ISSET(upload) ? "en" : "dis"); 2324 reply(0, "Sanitize file names: %sabled", 2325 CURCLASS_FLAGS_ISSET(sanenames) ? "en" : "dis"); 2326 reply(0, "PASV/LPSV/EPSV connections: %sabled", 2327 CURCLASS_FLAGS_ISSET(passive) ? "en" : "dis"); 2328 if (curclass.advertise.su_len != 0) { 2329 char buf[50]; /* big enough for IPv6 address */ 2330 const char *bp; 2331 2332 bp = inet_ntop(curclass.advertise.su_family, 2333 (void *)&curclass.advertise.su_addr, 2334 buf, sizeof(buf)); 2335 if (bp != NULL) 2336 reply(0, "PASV advertise address: %s", bp); 2337 } 2338 if (curclass.portmin && curclass.portmax) 2339 reply(0, "PASV port range: " LLF " - " LLF, 2340 (LLT)curclass.portmin, (LLT)curclass.portmax); 2341 if (curclass.rateget) 2342 reply(0, "Rate get limit: " LLF " bytes/sec", 2343 (LLT)curclass.rateget); 2344 else 2345 reply(0, "Rate get limit: disabled"); 2346 if (curclass.rateput) 2347 reply(0, "Rate put limit: " LLF " bytes/sec", 2348 (LLT)curclass.rateput); 2349 else 2350 reply(0, "Rate put limit: disabled"); 2351 if (curclass.mmapsize) 2352 reply(0, "Mmap size: " LLF, (LLT)curclass.mmapsize); 2353 else 2354 reply(0, "Mmap size: disabled"); 2355 if (curclass.readsize) 2356 reply(0, "Read size: " LLF, (LLT)curclass.readsize); 2357 else 2358 reply(0, "Read size: default"); 2359 if (curclass.writesize) 2360 reply(0, "Write size: " LLF, (LLT)curclass.writesize); 2361 else 2362 reply(0, "Write size: default"); 2363 if (curclass.sendbufsize) 2364 reply(0, "Send buffer size: " LLF, 2365 (LLT)curclass.sendbufsize); 2366 else 2367 reply(0, "Send buffer size: default"); 2368 if (curclass.sendlowat) 2369 reply(0, "Send low water mark: " LLF, 2370 (LLT)curclass.sendlowat); 2371 else 2372 reply(0, "Send low water mark: default"); 2373 reply(0, "Umask: %.04o", curclass.umask); 2374 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 2375 if (cp->suffix == NULL || cp->types == NULL || 2376 cp->command == NULL) 2377 continue; 2378 reply(0, "Conversion: %s [%s] disable: %s, command: %s", 2379 cp->suffix, cp->types, cp->disable, cp->command); 2380 } 2381 } 2382 2383 reply(211, "End of status"); 2384 } 2385 2386 void 2387 fatal(const char *s) 2388 { 2389 2390 reply(451, "Error in server: %s\n", s); 2391 reply(221, "Closing connection due to server error."); 2392 dologout(0); 2393 /* NOTREACHED */ 2394 } 2395 2396 /* 2397 * reply() -- 2398 * depending on the value of n, display fmt with a trailing CRLF and 2399 * prefix of: 2400 * n < -1 prefix the message with abs(n) + "-" (initial line) 2401 * n == 0 prefix the message with 4 spaces (middle lines) 2402 * n > 0 prefix the message with n + " " (final line) 2403 */ 2404 void 2405 reply(int n, const char *fmt, ...) 2406 { 2407 off_t b; 2408 va_list ap; 2409 2410 va_start(ap, fmt); 2411 b = 0; 2412 if (n == 0) 2413 cprintf(stdout, " "); 2414 else if (n < 0) 2415 cprintf(stdout, "%d-", -n); 2416 else 2417 cprintf(stdout, "%d ", n); 2418 b = vprintf(fmt, ap); 2419 va_end(ap); 2420 total_bytes += b; 2421 total_bytes_out += b; 2422 cprintf(stdout, "\r\n"); 2423 (void)fflush(stdout); 2424 if (debug) { 2425 syslog(LOG_DEBUG, "<--- %d%c", abs(n), (n < 0) ? '-' : ' '); 2426 va_start(ap, fmt); 2427 vsyslog(LOG_DEBUG, fmt, ap); 2428 va_end(ap); 2429 } 2430 } 2431 2432 static void 2433 logremotehost(struct sockinet *who) 2434 { 2435 2436 if (getnameinfo((struct sockaddr *)&who->si_su, 2437 who->su_len, remotehost, sizeof(remotehost), NULL, 0, 0)) 2438 strlcpy(remotehost, "?", sizeof(remotehost)); 2439 2440 #if HAVE_SETPROCTITLE 2441 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2442 setproctitle("%s", proctitle); 2443 #endif /* HAVE_SETPROCTITLE */ 2444 if (logging) 2445 syslog(LOG_INFO, "connection from %s to %s", 2446 remotehost, hostname); 2447 } 2448 2449 /* 2450 * Record logout in wtmp file and exit with supplied status. 2451 */ 2452 void 2453 dologout(int status) 2454 { 2455 /* 2456 * Prevent reception of SIGURG from resulting in a resumption 2457 * back to the main program loop. 2458 */ 2459 transflag = 0; 2460 logout_utmp(); 2461 if (logged_in) { 2462 #ifdef KERBEROS 2463 if (!notickets && krbtkfile_env) 2464 unlink(krbtkfile_env); 2465 #endif 2466 } 2467 /* beware of flushing buffers after a SIGPIPE */ 2468 if (xferlogfd != -1) 2469 close(xferlogfd); 2470 _exit(status); 2471 } 2472 2473 void 2474 abor(void) 2475 { 2476 2477 tmpline[0] = '\0'; 2478 is_oob = 0; 2479 reply(426, "Transfer aborted. Data connection closed."); 2480 reply(226, "Abort successful"); 2481 longjmp(urgcatch, 1); 2482 } 2483 2484 void 2485 statxfer(void) 2486 { 2487 2488 tmpline[0] = '\0'; 2489 is_oob = 0; 2490 if (file_size != (off_t) -1) 2491 reply(213, 2492 "Status: " LLF " of " LLF " byte%s transferred", 2493 (LLT)byte_count, (LLT)file_size, 2494 PLURAL(byte_count)); 2495 else 2496 reply(213, "Status: " LLF " byte%s transferred", 2497 (LLT)byte_count, PLURAL(byte_count)); 2498 } 2499 2500 static void 2501 myoob(int signo) 2502 { 2503 char *cp; 2504 2505 /* only process if transfer occurring */ 2506 if (!transflag) 2507 return; 2508 cp = tmpline; 2509 if (getline(cp, sizeof(tmpline), stdin) == NULL) { 2510 reply(221, "You could at least say goodbye."); 2511 dologout(0); 2512 } 2513 is_oob = 1; 2514 ftp_handle_line(cp); 2515 is_oob = 0; 2516 } 2517 2518 static int 2519 bind_pasv_addr(void) 2520 { 2521 static int passiveport; 2522 int port, len; 2523 2524 len = pasv_addr.su_len; 2525 if (curclass.portmin == 0 && curclass.portmax == 0) { 2526 pasv_addr.su_port = 0; 2527 return (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len)); 2528 } 2529 2530 if (passiveport == 0) { 2531 srand(getpid()); 2532 passiveport = rand() % (curclass.portmax - curclass.portmin) 2533 + curclass.portmin; 2534 } 2535 2536 port = passiveport; 2537 while (1) { 2538 port++; 2539 if (port > curclass.portmax) 2540 port = curclass.portmin; 2541 else if (port == passiveport) { 2542 errno = EAGAIN; 2543 return (-1); 2544 } 2545 pasv_addr.su_port = htons(port); 2546 if (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len) == 0) 2547 break; 2548 if (errno != EADDRINUSE) 2549 return (-1); 2550 } 2551 passiveport = port; 2552 return (0); 2553 } 2554 2555 /* 2556 * Note: a response of 425 is not mentioned as a possible response to 2557 * the PASV command in RFC959. However, it has been blessed as 2558 * a legitimate response by Jon Postel in a telephone conversation 2559 * with Rick Adams on 25 Jan 89. 2560 */ 2561 void 2562 passive(void) 2563 { 2564 int len; 2565 char *p, *a; 2566 2567 if (pdata >= 0) 2568 close(pdata); 2569 pdata = socket(AF_INET, SOCK_STREAM, 0); 2570 if (pdata < 0 || !logged_in) { 2571 perror_reply(425, "Can't open passive connection"); 2572 return; 2573 } 2574 pasv_addr = ctrl_addr; 2575 2576 if (bind_pasv_addr() < 0) 2577 goto pasv_error; 2578 len = pasv_addr.su_len; 2579 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 2580 goto pasv_error; 2581 pasv_addr.su_len = len; 2582 if (listen(pdata, 1) < 0) 2583 goto pasv_error; 2584 if (curclass.advertise.su_len != 0) 2585 a = (char *) &curclass.advertise.su_addr; 2586 else 2587 a = (char *) &pasv_addr.su_addr; 2588 p = (char *) &pasv_addr.su_port; 2589 2590 #define UC(b) (((int) b) & 0xff) 2591 2592 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2593 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2594 return; 2595 2596 pasv_error: 2597 (void) close(pdata); 2598 pdata = -1; 2599 perror_reply(425, "Can't open passive connection"); 2600 return; 2601 } 2602 2603 /* 2604 * convert protocol identifier to/from AF 2605 */ 2606 int 2607 lpsvproto2af(int proto) 2608 { 2609 2610 switch (proto) { 2611 case 4: 2612 return AF_INET; 2613 #ifdef INET6 2614 case 6: 2615 return AF_INET6; 2616 #endif 2617 default: 2618 return -1; 2619 } 2620 } 2621 2622 int 2623 af2lpsvproto(int af) 2624 { 2625 2626 switch (af) { 2627 case AF_INET: 2628 return 4; 2629 #ifdef INET6 2630 case AF_INET6: 2631 return 6; 2632 #endif 2633 default: 2634 return -1; 2635 } 2636 } 2637 2638 int 2639 epsvproto2af(int proto) 2640 { 2641 2642 switch (proto) { 2643 case 1: 2644 return AF_INET; 2645 #ifdef INET6 2646 case 2: 2647 return AF_INET6; 2648 #endif 2649 default: 2650 return -1; 2651 } 2652 } 2653 2654 int 2655 af2epsvproto(int af) 2656 { 2657 2658 switch (af) { 2659 case AF_INET: 2660 return 1; 2661 #ifdef INET6 2662 case AF_INET6: 2663 return 2; 2664 #endif 2665 default: 2666 return -1; 2667 } 2668 } 2669 2670 /* 2671 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2672 * 229 Entering Extended Passive Mode (|||port|) 2673 */ 2674 void 2675 long_passive(char *cmd, int pf) 2676 { 2677 int len; 2678 char *p, *a; 2679 2680 if (!logged_in) { 2681 syslog(LOG_NOTICE, "long passive but not logged in"); 2682 reply(503, "Login with USER first."); 2683 return; 2684 } 2685 2686 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 2687 /* 2688 * XXX: only EPRT/EPSV ready clients will understand this 2689 */ 2690 if (strcmp(cmd, "EPSV") != 0) 2691 reply(501, "Network protocol mismatch"); /*XXX*/ 2692 else 2693 epsv_protounsupp("Network protocol mismatch"); 2694 2695 return; 2696 } 2697 2698 if (pdata >= 0) 2699 close(pdata); 2700 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2701 if (pdata < 0) { 2702 perror_reply(425, "Can't open passive connection"); 2703 return; 2704 } 2705 pasv_addr = ctrl_addr; 2706 if (bind_pasv_addr() < 0) 2707 goto pasv_error; 2708 len = pasv_addr.su_len; 2709 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 2710 goto pasv_error; 2711 pasv_addr.su_len = len; 2712 if (listen(pdata, 1) < 0) 2713 goto pasv_error; 2714 p = (char *) &pasv_addr.su_port; 2715 2716 #define UC(b) (((int) b) & 0xff) 2717 2718 if (strcmp(cmd, "LPSV") == 0) { 2719 struct sockinet *advert; 2720 2721 if (curclass.advertise.su_len != 0) 2722 advert = &curclass.advertise; 2723 else 2724 advert = &pasv_addr; 2725 switch (advert->su_family) { 2726 case AF_INET: 2727 a = (char *) &advert->su_addr; 2728 reply(228, 2729 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2730 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2731 2, UC(p[0]), UC(p[1])); 2732 return; 2733 #ifdef INET6 2734 case AF_INET6: 2735 a = (char *) &advert->su_6addr; 2736 reply(228, 2737 "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)", 2738 6, 16, 2739 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2740 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2741 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2742 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2743 2, UC(p[0]), UC(p[1])); 2744 return; 2745 #endif 2746 } 2747 #undef UC 2748 } else if (strcmp(cmd, "EPSV") == 0) { 2749 switch (pasv_addr.su_family) { 2750 case AF_INET: 2751 #ifdef INET6 2752 case AF_INET6: 2753 #endif 2754 reply(229, "Entering Extended Passive Mode (|||%d|)", 2755 ntohs(pasv_addr.su_port)); 2756 return; 2757 } 2758 } else { 2759 /* more proper error code? */ 2760 } 2761 2762 pasv_error: 2763 (void) close(pdata); 2764 pdata = -1; 2765 perror_reply(425, "Can't open passive connection"); 2766 return; 2767 } 2768 2769 int 2770 extended_port(const char *arg) 2771 { 2772 char *tmp = NULL; 2773 char *result[3]; 2774 char *p, *q; 2775 char delim; 2776 struct addrinfo hints; 2777 struct addrinfo *res = NULL; 2778 int i; 2779 unsigned long proto; 2780 2781 tmp = xstrdup(arg); 2782 p = tmp; 2783 delim = p[0]; 2784 p++; 2785 memset(result, 0, sizeof(result)); 2786 for (i = 0; i < 3; i++) { 2787 q = strchr(p, delim); 2788 if (!q || *q != delim) 2789 goto parsefail; 2790 *q++ = '\0'; 2791 result[i] = p; 2792 p = q; 2793 } 2794 2795 /* some more sanity checks */ 2796 errno = 0; 2797 p = NULL; 2798 (void)strtoul(result[2], &p, 10); 2799 if (errno || !*result[2] || *p) 2800 goto parsefail; 2801 errno = 0; 2802 p = NULL; 2803 proto = strtoul(result[0], &p, 10); 2804 if (errno || !*result[0] || *p) 2805 goto protounsupp; 2806 2807 memset(&hints, 0, sizeof(hints)); 2808 hints.ai_family = epsvproto2af((int)proto); 2809 if (hints.ai_family < 0) 2810 goto protounsupp; 2811 hints.ai_socktype = SOCK_STREAM; 2812 hints.ai_flags = AI_NUMERICHOST; 2813 if (getaddrinfo(result[1], result[2], &hints, &res)) 2814 goto parsefail; 2815 if (res->ai_next) 2816 goto parsefail; 2817 if (sizeof(data_dest) < res->ai_addrlen) 2818 goto parsefail; 2819 memcpy(&data_dest.si_su, res->ai_addr, res->ai_addrlen); 2820 data_dest.su_len = res->ai_addrlen; 2821 #ifdef INET6 2822 if (his_addr.su_family == AF_INET6 && 2823 data_dest.su_family == AF_INET6) { 2824 /* XXX: more sanity checks! */ 2825 data_dest.su_scope_id = his_addr.su_scope_id; 2826 } 2827 #endif 2828 2829 if (tmp != NULL) 2830 free(tmp); 2831 if (res) 2832 freeaddrinfo(res); 2833 return 0; 2834 2835 parsefail: 2836 reply(500, "Invalid argument, rejected."); 2837 usedefault = 1; 2838 if (tmp != NULL) 2839 free(tmp); 2840 if (res) 2841 freeaddrinfo(res); 2842 return -1; 2843 2844 protounsupp: 2845 epsv_protounsupp("Protocol not supported"); 2846 usedefault = 1; 2847 if (tmp != NULL) 2848 free(tmp); 2849 if (res) 2850 freeaddrinfo(res); 2851 return -1; 2852 } 2853 2854 /* 2855 * 522 Protocol not supported (proto,...) 2856 * as we assume address family for control and data connections are the same, 2857 * we do not return the list of address families we support - instead, we 2858 * return the address family of the control connection. 2859 */ 2860 void 2861 epsv_protounsupp(const char *message) 2862 { 2863 int proto; 2864 2865 proto = af2epsvproto(ctrl_addr.su_family); 2866 if (proto < 0) 2867 reply(501, "%s", message); /* XXX */ 2868 else 2869 reply(522, "%s, use (%d)", message, proto); 2870 } 2871 2872 /* 2873 * Generate unique name for file with basename "local". 2874 * The file named "local" is already known to exist. 2875 * Generates failure reply on error. 2876 * 2877 * XXX: this function should under go changes similar to 2878 * the mktemp(3)/mkstemp(3) changes. 2879 */ 2880 static char * 2881 gunique(const char *local) 2882 { 2883 static char new[MAXPATHLEN]; 2884 struct stat st; 2885 char *cp; 2886 int count; 2887 2888 cp = strrchr(local, '/'); 2889 if (cp) 2890 *cp = '\0'; 2891 if (stat(cp ? local : ".", &st) < 0) { 2892 perror_reply(553, cp ? local : "."); 2893 return (NULL); 2894 } 2895 if (cp) 2896 *cp = '/'; 2897 for (count = 1; count < 100; count++) { 2898 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2899 if (stat(new, &st) < 0) 2900 return (new); 2901 } 2902 reply(452, "Unique file name cannot be created."); 2903 return (NULL); 2904 } 2905 2906 /* 2907 * Format and send reply containing system error number. 2908 */ 2909 void 2910 perror_reply(int code, const char *string) 2911 { 2912 int save_errno; 2913 2914 save_errno = errno; 2915 reply(code, "%s: %s.", string, strerror(errno)); 2916 errno = save_errno; 2917 } 2918 2919 static char *onefile[] = { 2920 "", 2921 0 2922 }; 2923 2924 void 2925 send_file_list(const char *whichf) 2926 { 2927 struct stat st; 2928 DIR *dirp = NULL; 2929 struct dirent *dir; 2930 FILE *dout = NULL; 2931 char **dirlist, *dirname, *p; 2932 char *notglob = NULL; 2933 int simple = 0; 2934 int freeglob = 0; 2935 glob_t gl; 2936 2937 #ifdef __GNUC__ 2938 (void) &dout; 2939 (void) &dirlist; 2940 (void) &simple; 2941 (void) &freeglob; 2942 #endif 2943 2944 p = NULL; 2945 if (strpbrk(whichf, "~{[*?") != NULL) { 2946 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE|GLOB_LIMIT; 2947 2948 memset(&gl, 0, sizeof(gl)); 2949 freeglob = 1; 2950 if (glob(whichf, flags, 0, &gl)) { 2951 reply(550, "not found"); 2952 goto out; 2953 } else if (gl.gl_pathc == 0) { 2954 errno = ENOENT; 2955 perror_reply(550, whichf); 2956 goto out; 2957 } 2958 dirlist = gl.gl_pathv; 2959 } else { 2960 notglob = xstrdup(whichf); 2961 onefile[0] = notglob; 2962 dirlist = onefile; 2963 simple = 1; 2964 } 2965 /* XXX: } for vi sm */ 2966 2967 if (setjmp(urgcatch)) { 2968 transflag = 0; 2969 goto out; 2970 } 2971 while ((dirname = *dirlist++) != NULL) { 2972 int trailingslash = 0; 2973 2974 if (stat(dirname, &st) < 0) { 2975 /* 2976 * If user typed "ls -l", etc, and the client 2977 * used NLST, do what the user meant. 2978 */ 2979 /* XXX: nuke this support? */ 2980 if (dirname[0] == '-' && *dirlist == NULL && 2981 transflag == 0) { 2982 char *argv[] = { INTERNAL_LS, "", NULL }; 2983 2984 argv[1] = dirname; 2985 retrieve(argv, dirname); 2986 goto out; 2987 } 2988 perror_reply(550, whichf); 2989 goto cleanup_send_file_list; 2990 } 2991 2992 if (S_ISREG(st.st_mode)) { 2993 /* 2994 * XXXRFC: 2995 * should we follow RFC959 and not work 2996 * for non directories? 2997 */ 2998 if (dout == NULL) { 2999 dout = dataconn("file list", (off_t)-1, "w"); 3000 if (dout == NULL) 3001 goto out; 3002 transflag++; 3003 } 3004 cprintf(dout, "%s%s\n", dirname, 3005 type == TYPE_A ? "\r" : ""); 3006 continue; 3007 } else if (!S_ISDIR(st.st_mode)) 3008 continue; 3009 3010 if (dirname[strlen(dirname) - 1] == '/') 3011 trailingslash++; 3012 3013 if ((dirp = opendir(dirname)) == NULL) 3014 continue; 3015 3016 while ((dir = readdir(dirp)) != NULL) { 3017 char nbuf[MAXPATHLEN]; 3018 3019 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 3020 continue; 3021 3022 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 3023 trailingslash ? "" : "/", dir->d_name); 3024 3025 /* 3026 * We have to do a stat to ensure it's 3027 * not a directory or special file. 3028 */ 3029 /* 3030 * XXXRFC: 3031 * should we follow RFC959 and filter out 3032 * non files ? lukem - NO!, or not until 3033 * our ftp client uses MLS{T,D} for completion. 3034 */ 3035 if (simple || (stat(nbuf, &st) == 0 && 3036 S_ISREG(st.st_mode))) { 3037 if (dout == NULL) { 3038 dout = dataconn("file list", (off_t)-1, 3039 "w"); 3040 if (dout == NULL) 3041 goto out; 3042 transflag++; 3043 } 3044 p = nbuf; 3045 if (nbuf[0] == '.' && nbuf[1] == '/') 3046 p = &nbuf[2]; 3047 cprintf(dout, "%s%s\n", p, 3048 type == TYPE_A ? "\r" : ""); 3049 } 3050 } 3051 (void) closedir(dirp); 3052 } 3053 3054 if (dout == NULL) 3055 reply(550, "No files found."); 3056 else if (ferror(dout) != 0) 3057 perror_reply(550, "Data connection"); 3058 else 3059 reply(226, "Transfer complete."); 3060 3061 cleanup_send_file_list: 3062 transflag = 0; 3063 closedataconn(dout); 3064 out: 3065 total_xfers++; 3066 total_xfers_out++; 3067 if (notglob) 3068 free(notglob); 3069 if (freeglob) 3070 globfree(&gl); 3071 } 3072 3073 char * 3074 conffilename(const char *s) 3075 { 3076 static char filename[MAXPATHLEN]; 3077 3078 if (*s == '/') 3079 strlcpy(filename, s, sizeof(filename)); 3080 else 3081 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 3082 return (filename); 3083 } 3084 3085 /* 3086 * logxfer -- 3087 * if logging > 1, then based on the arguments, syslog a message: 3088 * if bytes != -1 "<command> <file1> = <bytes> bytes" 3089 * else if file2 != NULL "<command> <file1> <file2>" 3090 * else "<command> <file1>" 3091 * if elapsed != NULL, append "in xxx.yyy seconds" 3092 * if error != NULL, append ": " + error 3093 * 3094 * if doxferlog != 0, bytes != -1, and command is "get", "put", 3095 * or "append", syslog and/or write a wu-ftpd style xferlog entry 3096 */ 3097 void 3098 logxfer(const char *command, off_t bytes, const char *file1, const char *file2, 3099 const struct timeval *elapsed, const char *error) 3100 { 3101 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN]; 3102 const char *r1, *r2; 3103 char direction; 3104 size_t len; 3105 time_t now; 3106 3107 if (logging <=1 && !doxferlog) 3108 return; 3109 3110 r1 = r2 = NULL; 3111 if ((r1 = realpath(file1, realfile)) == NULL) 3112 r1 = file1; 3113 if (file2 != NULL) 3114 if ((r2 = realpath(file2, realfile)) == NULL) 3115 r2 = file2; 3116 3117 /* 3118 * syslog command 3119 */ 3120 if (logging > 1) { 3121 len = snprintf(buf, sizeof(buf), "%s %s", command, r1); 3122 if (bytes != (off_t)-1) 3123 len += snprintf(buf + len, sizeof(buf) - len, 3124 " = " LLF " byte%s", (LLT) bytes, PLURAL(bytes)); 3125 else if (r2 != NULL) 3126 len += snprintf(buf + len, sizeof(buf) - len, 3127 " %s", r2); 3128 if (elapsed != NULL) 3129 len += snprintf(buf + len, sizeof(buf) - len, 3130 " in %ld.%.03d seconds", elapsed->tv_sec, 3131 (int)(elapsed->tv_usec / 1000)); 3132 if (error != NULL) 3133 len += snprintf(buf + len, sizeof(buf) - len, 3134 ": %s", error); 3135 syslog(LOG_INFO, "%s", buf); 3136 } 3137 3138 /* 3139 * syslog wu-ftpd style log entry, prefixed with "xferlog: " 3140 */ 3141 if (!doxferlog || bytes == -1) 3142 return; 3143 3144 if (strcmp(command, "get") == 0) 3145 direction = 'o'; 3146 else if (strcmp(command, "put") == 0 || strcmp(command, "append") == 0) 3147 direction = 'i'; 3148 else 3149 return; 3150 3151 time(&now); 3152 len = snprintf(buf, sizeof(buf), 3153 "%.24s %ld %s " LLF " %s %c %s %c %c %s FTP 0 * %c\n", 3154 3155 /* 3156 * XXX: wu-ftpd puts ' (send)' or ' (recv)' in the syslog message, and removes 3157 * the full date. This may be problematic for accurate log parsing, 3158 * given that syslog messages don't contain the full date. 3159 */ 3160 ctime(&now), 3161 elapsed == NULL ? 0 : elapsed->tv_sec + (elapsed->tv_usec > 0), 3162 remotehost, 3163 (LLT) bytes, 3164 r1, 3165 type == TYPE_A ? 'a' : 'b', 3166 "_", /* XXX: take conversions into account? */ 3167 direction, 3168 3169 curclass.type == CLASS_GUEST ? 'a' : 3170 curclass.type == CLASS_CHROOT ? 'g' : 3171 curclass.type == CLASS_REAL ? 'r' : '?', 3172 3173 curclass.type == CLASS_GUEST ? pw->pw_passwd : pw->pw_name, 3174 error != NULL ? 'i' : 'c' 3175 ); 3176 3177 if ((doxferlog & 2) && xferlogfd != -1) 3178 write(xferlogfd, buf, len); 3179 if ((doxferlog & 1)) { 3180 buf[len-1] = '\n'; /* strip \n from syslog message */ 3181 syslog(LOG_INFO, "xferlog: %s", buf); 3182 } 3183 } 3184 3185 /* 3186 * Log the resource usage. 3187 * 3188 * XXX: more resource usage to logging? 3189 */ 3190 void 3191 logrusage(const struct rusage *rusage_before, 3192 const struct rusage *rusage_after) 3193 { 3194 struct timeval usrtime, systime; 3195 3196 if (logging <= 1) 3197 return; 3198 3199 timersub(&rusage_after->ru_utime, &rusage_before->ru_utime, &usrtime); 3200 timersub(&rusage_after->ru_stime, &rusage_before->ru_stime, &systime); 3201 syslog(LOG_INFO, "%ld.%.03du %ld.%.03ds %ld+%ldio %ldpf+%ldw", 3202 usrtime.tv_sec, (int)(usrtime.tv_usec / 1000), 3203 systime.tv_sec, (int)(systime.tv_usec / 1000), 3204 rusage_after->ru_inblock - rusage_before->ru_inblock, 3205 rusage_after->ru_oublock - rusage_before->ru_oublock, 3206 rusage_after->ru_majflt - rusage_before->ru_majflt, 3207 rusage_after->ru_nswap - rusage_before->ru_nswap); 3208 } 3209 3210 /* 3211 * Determine if `password' is valid for user given in `pw'. 3212 * Returns 2 if password expired, 1 if otherwise failed, 0 if ok 3213 */ 3214 int 3215 checkpassword(const struct passwd *pwent, const char *password) 3216 { 3217 char *orig, *new; 3218 time_t expire; 3219 3220 expire = 0; 3221 if (pwent == NULL) 3222 return 1; 3223 3224 orig = pwent->pw_passwd; /* save existing password */ 3225 expire = pwent->pw_expire; 3226 3227 if (orig[0] == '\0') /* don't allow empty passwords */ 3228 return 1; 3229 3230 new = crypt(password, orig); /* encrypt given password */ 3231 if (strcmp(new, orig) != 0) /* compare */ 3232 return 1; 3233 3234 if (expire && time(NULL) >= expire) 3235 return 2; /* check if expired */ 3236 3237 return 0; /* OK! */ 3238 } 3239 3240 char * 3241 xstrdup(const char *s) 3242 { 3243 char *new = strdup(s); 3244 3245 if (new == NULL) 3246 fatal("Local resource failure: malloc"); 3247 /* NOTREACHED */ 3248 return (new); 3249 } 3250 3251 /* 3252 * As per fprintf(), but increment total_bytes and total_bytes_out, 3253 * by the appropriate amount. 3254 */ 3255 void 3256 cprintf(FILE *fd, const char *fmt, ...) 3257 { 3258 off_t b; 3259 va_list ap; 3260 3261 va_start(ap, fmt); 3262 b = vfprintf(fd, fmt, ap); 3263 va_end(ap); 3264 total_bytes += b; 3265 total_bytes_out += b; 3266 } 3267