ftpd.c revision 1.176
1 /* $NetBSD: ftpd.c,v 1.176 2006/05/09 20:18:06 mrg Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2004 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. Neither the name of the University nor the names of its contributors 52 * may be used to endorse or promote products derived from this software 53 * without specific prior written permission. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 */ 67 68 /* 69 * Copyright (C) 1997 and 1998 WIDE Project. 70 * All rights reserved. 71 * 72 * Redistribution and use in source and binary forms, with or without 73 * modification, are permitted provided that the following conditions 74 * are met: 75 * 1. Redistributions of source code must retain the above copyright 76 * notice, this list of conditions and the following disclaimer. 77 * 2. Redistributions in binary form must reproduce the above copyright 78 * notice, this list of conditions and the following disclaimer in the 79 * documentation and/or other materials provided with the distribution. 80 * 3. Neither the name of the project nor the names of its contributors 81 * may be used to endorse or promote products derived from this software 82 * without specific prior written permission. 83 * 84 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 85 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 86 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 87 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 88 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 89 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 90 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 91 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 92 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 93 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 94 * SUCH DAMAGE. 95 */ 96 97 #include <sys/cdefs.h> 98 #ifndef lint 99 __COPYRIGHT( 100 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 101 The Regents of the University of California. All rights reserved.\n"); 102 #endif /* not lint */ 103 104 #ifndef lint 105 #if 0 106 static char sccsid[] = "@(#)ftpd.c 8.5 (Berkeley) 4/28/95"; 107 #else 108 __RCSID("$NetBSD: ftpd.c,v 1.176 2006/05/09 20:18:06 mrg Exp $"); 109 #endif 110 #endif /* not lint */ 111 112 /* 113 * FTP server. 114 */ 115 #include <sys/param.h> 116 #include <sys/stat.h> 117 #include <sys/ioctl.h> 118 #include <sys/socket.h> 119 #include <sys/wait.h> 120 #include <sys/mman.h> 121 #include <sys/resource.h> 122 123 #include <netinet/in.h> 124 #include <netinet/in_systm.h> 125 #include <netinet/ip.h> 126 127 #define FTP_NAMES 128 #include <arpa/ftp.h> 129 #include <arpa/inet.h> 130 #include <arpa/telnet.h> 131 132 #include <ctype.h> 133 #include <dirent.h> 134 #include <err.h> 135 #include <errno.h> 136 #include <fcntl.h> 137 #include <fnmatch.h> 138 #include <glob.h> 139 #include <grp.h> 140 #include <limits.h> 141 #include <netdb.h> 142 #include <pwd.h> 143 #include <poll.h> 144 #include <signal.h> 145 #include <stdarg.h> 146 #include <stdio.h> 147 #include <stdlib.h> 148 #include <string.h> 149 #include <syslog.h> 150 #include <time.h> 151 #include <tzfile.h> 152 #include <unistd.h> 153 #include <util.h> 154 #ifdef SUPPORT_UTMP 155 #include <utmp.h> 156 #endif 157 #ifdef SUPPORT_UTMPX 158 #include <utmpx.h> 159 #endif 160 #ifdef SKEY 161 #include <skey.h> 162 #endif 163 #ifdef KERBEROS5 164 #include <com_err.h> 165 #include <krb5/krb5.h> 166 #endif 167 168 #ifdef LOGIN_CAP 169 #include <login_cap.h> 170 #endif 171 172 #ifdef USE_PAM 173 #include <security/pam_appl.h> 174 #endif 175 176 #define GLOBAL 177 #include "extern.h" 178 #include "pathnames.h" 179 #include "version.h" 180 181 volatile sig_atomic_t transflag; 182 volatile sig_atomic_t urgflag; 183 184 int data; 185 int Dflag; 186 int sflag; 187 int stru; /* avoid C keyword */ 188 int mode; 189 int dataport; /* use specific data port */ 190 int dopidfile; /* maintain pid file */ 191 int doutmp; /* update utmp file */ 192 int dowtmp; /* update wtmp file */ 193 int doxferlog; /* syslog/write wu-ftpd style xferlog entries */ 194 int xferlogfd; /* fd to write wu-ftpd xferlog entries to */ 195 int dropprivs; /* if privileges should or have been dropped */ 196 int mapped; /* IPv4 connection on AF_INET6 socket */ 197 off_t file_size; 198 off_t byte_count; 199 static char ttyline[20]; 200 201 #ifdef USE_PAM 202 static int auth_pam(struct passwd **, const char *); 203 pam_handle_t *pamh = NULL; 204 #endif 205 206 #ifdef SUPPORT_UTMP 207 static struct utmp utmp; /* for utmp */ 208 #endif 209 #ifdef SUPPORT_UTMPX 210 static struct utmpx utmpx; /* for utmpx */ 211 #endif 212 213 static const char *anondir = NULL; 214 static const char *confdir = _DEFAULT_CONFDIR; 215 216 static char *curname; /* current USER name */ 217 static size_t curname_len; /* length of curname (include NUL) */ 218 219 #if defined(KERBEROS) || defined(KERBEROS5) 220 int has_ccache = 0; 221 int notickets = 1; 222 char *krbtkfile_env = NULL; 223 char *tty = ttyline; 224 int login_krb5_forwardable_tgt = 0; 225 #endif 226 227 int epsvall = 0; 228 229 /* 230 * Timeout intervals for retrying connections 231 * to hosts that don't accept PORT cmds. This 232 * is a kludge, but given the problems with TCP... 233 */ 234 #define SWAITMAX 90 /* wait at most 90 seconds */ 235 #define SWAITINT 5 /* interval between retries */ 236 237 int swaitmax = SWAITMAX; 238 int swaitint = SWAITINT; 239 240 enum send_status { 241 SS_SUCCESS, 242 SS_ABORTED, /* transfer aborted */ 243 SS_NO_TRANSFER, /* no transfer made yet */ 244 SS_FILE_ERROR, /* file read error */ 245 SS_DATA_ERROR /* data send error */ 246 }; 247 248 static int bind_pasv_addr(void); 249 static int checkuser(const char *, const char *, int, int, char **); 250 static int checkaccess(const char *); 251 static int checkpassword(const struct passwd *, const char *); 252 static void end_login(void); 253 static FILE *getdatasock(const char *); 254 static char *gunique(const char *); 255 static void login_utmp(const char *, const char *, const char *, 256 struct sockinet *); 257 static void logremotehost(struct sockinet *); 258 static void lostconn(int); 259 static void toolong(int); 260 static void sigquit(int); 261 static void sigurg(int); 262 static int handleoobcmd(void); 263 static int receive_data(FILE *, FILE *); 264 static int send_data(FILE *, FILE *, const struct stat *, int); 265 static struct passwd *sgetpwnam(const char *); 266 static int write_data(int, char *, size_t, off_t *, struct timeval *, 267 int); 268 static enum send_status 269 send_data_with_read(int, int, const struct stat *, int); 270 static enum send_status 271 send_data_with_mmap(int, int, const struct stat *, int); 272 static void logrusage(const struct rusage *, const struct rusage *); 273 static void logout_utmp(void); 274 275 int main(int, char *[]); 276 277 #if defined(KERBEROS) 278 int klogin(struct passwd *, char *, char *, char *); 279 void kdestroy(void); 280 #endif 281 #if defined(KERBEROS5) 282 int k5login(struct passwd *, char *, char *, char *); 283 void k5destroy(void); 284 #endif 285 286 int 287 main(int argc, char *argv[]) 288 { 289 int ch, on = 1, tos, keepalive; 290 socklen_t addrlen; 291 #ifdef KERBEROS5 292 krb5_error_code kerror; 293 #endif 294 char *p; 295 const char *xferlogname = NULL; 296 long l; 297 struct sigaction sa; 298 sa_family_t af = AF_UNSPEC; 299 300 connections = 1; 301 ftpd_debug = 0; 302 logging = 0; 303 pdata = -1; 304 Dflag = 0; 305 sflag = 0; 306 dataport = 0; 307 dopidfile = 1; /* default: DO use a pid file to count users */ 308 doutmp = 0; /* default: Do NOT log to utmp */ 309 dowtmp = 1; /* default: DO log to wtmp */ 310 doxferlog = 0; /* default: Do NOT syslog xferlog */ 311 xferlogfd = -1; /* default: Do NOT write xferlog file */ 312 dropprivs = 0; 313 mapped = 0; 314 usedefault = 1; 315 emailaddr = NULL; 316 hostname[0] = '\0'; 317 homedir[0] = '\0'; 318 gidcount = 0; 319 is_oob = 0; 320 version = FTPD_VERSION; 321 322 /* 323 * LOG_NDELAY sets up the logging connection immediately, 324 * necessary for anonymous ftp's that chroot and can't do it later. 325 */ 326 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 327 328 while ((ch = getopt(argc, argv, 329 "46a:c:C:Dde:h:HlL:P:qQrst:T:uUvV:wWX")) != -1) { 330 switch (ch) { 331 case '4': 332 af = AF_INET; 333 break; 334 335 case '6': 336 af = AF_INET6; 337 break; 338 339 case 'a': 340 anondir = optarg; 341 break; 342 343 case 'c': 344 confdir = optarg; 345 break; 346 347 case 'C': 348 pw = sgetpwnam(optarg); 349 exit(checkaccess(optarg) ? 0 : 1); 350 /* NOTREACHED */ 351 352 case 'D': 353 Dflag = 1; 354 break; 355 356 case 'd': 357 case 'v': /* deprecated */ 358 ftpd_debug = 1; 359 break; 360 361 case 'e': 362 emailaddr = optarg; 363 break; 364 365 case 'h': 366 strlcpy(hostname, optarg, sizeof(hostname)); 367 break; 368 369 case 'H': 370 if (gethostname(hostname, sizeof(hostname)) == -1) 371 hostname[0] = '\0'; 372 hostname[sizeof(hostname) - 1] = '\0'; 373 break; 374 375 case 'l': 376 logging++; /* > 1 == extra logging */ 377 break; 378 379 case 'L': 380 xferlogname = optarg; 381 break; 382 383 case 'P': 384 errno = 0; 385 p = NULL; 386 l = strtol(optarg, &p, 10); 387 if (errno || *optarg == '\0' || *p != '\0' || 388 l < IPPORT_RESERVED || 389 l > IPPORT_ANONMAX) { 390 syslog(LOG_WARNING, "Invalid dataport %s", 391 optarg); 392 dataport = 0; 393 } 394 dataport = (int)l; 395 break; 396 397 case 'q': 398 dopidfile = 1; 399 break; 400 401 case 'Q': 402 dopidfile = 0; 403 break; 404 405 case 'r': 406 dropprivs = 1; 407 break; 408 409 case 's': 410 sflag = 1; 411 break; 412 413 case 't': 414 case 'T': 415 syslog(LOG_WARNING, 416 "-%c has been deprecated in favour of ftpd.conf", 417 ch); 418 break; 419 420 case 'u': 421 doutmp = 1; 422 break; 423 424 case 'U': 425 doutmp = 0; 426 break; 427 428 case 'V': 429 if (EMPTYSTR(optarg) || strcmp(optarg, "-") == 0) 430 version = NULL; 431 else 432 version = ftpd_strdup(optarg); 433 break; 434 435 case 'w': 436 dowtmp = 1; 437 break; 438 439 case 'W': 440 dowtmp = 0; 441 break; 442 443 case 'X': 444 doxferlog |= 1; 445 break; 446 447 default: 448 if (optopt == 'a' || optopt == 'C') 449 exit(1); 450 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 451 break; 452 } 453 } 454 if (EMPTYSTR(confdir)) 455 confdir = _DEFAULT_CONFDIR; 456 457 if (dowtmp) { 458 #ifdef SUPPORT_UTMPX 459 ftpd_initwtmpx(); 460 #endif 461 #ifdef SUPPORT_UTMP 462 ftpd_initwtmp(); 463 #endif 464 } 465 errno = 0; 466 l = sysconf(_SC_LOGIN_NAME_MAX); 467 if (l == -1 && errno != 0) { 468 syslog(LOG_ERR, "sysconf _SC_LOGIN_NAME_MAX: %m"); 469 exit(1); 470 } else if (l <= 0) { 471 syslog(LOG_WARNING, "using conservative LOGIN_NAME_MAX value"); 472 curname_len = _POSIX_LOGIN_NAME_MAX; 473 } else 474 curname_len = (size_t)l; 475 curname = malloc(curname_len); 476 if (curname == NULL) { 477 syslog(LOG_ERR, "malloc: %m"); 478 exit(1); 479 } 480 curname[0] = '\0'; 481 482 if (Dflag) { 483 int error, fd, i, n, *socks; 484 struct pollfd *fds; 485 struct addrinfo hints, *res, *res0; 486 487 if (daemon(1, 0) == -1) { 488 syslog(LOG_ERR, "failed to daemonize: %m"); 489 exit(1); 490 } 491 (void)memset(&sa, 0, sizeof(sa)); 492 sa.sa_handler = SIG_IGN; 493 sa.sa_flags = SA_NOCLDWAIT; 494 sigemptyset(&sa.sa_mask); 495 (void)sigaction(SIGCHLD, &sa, NULL); 496 497 (void)memset(&hints, 0, sizeof(hints)); 498 hints.ai_flags = AI_PASSIVE; 499 hints.ai_family = af; 500 hints.ai_socktype = SOCK_STREAM; 501 error = getaddrinfo(NULL, "ftp", &hints, &res0); 502 if (error) { 503 syslog(LOG_ERR, "getaddrinfo: %s", gai_strerror(error)); 504 exit(1); 505 } 506 507 for (n = 0, res = res0; res != NULL; res = res->ai_next) 508 n++; 509 if (n == 0) { 510 syslog(LOG_ERR, "no addresses available"); 511 exit(1); 512 } 513 socks = malloc(n * sizeof(int)); 514 fds = malloc(n * sizeof(struct pollfd)); 515 if (socks == NULL || fds == NULL) { 516 syslog(LOG_ERR, "malloc: %m"); 517 exit(1); 518 } 519 520 for (n = 0, res = res0; res != NULL; res = res->ai_next) { 521 socks[n] = socket(res->ai_family, res->ai_socktype, 522 res->ai_protocol); 523 if (socks[n] == -1) 524 continue; 525 (void)setsockopt(socks[n], SOL_SOCKET, SO_REUSEADDR, 526 &on, sizeof(on)); 527 if (bind(socks[n], res->ai_addr, res->ai_addrlen) 528 == -1) { 529 (void)close(socks[n]); 530 continue; 531 } 532 if (listen(socks[n], 12) == -1) { 533 (void)close(socks[n]); 534 continue; 535 } 536 537 fds[n].fd = socks[n]; 538 fds[n].events = POLLIN; 539 n++; 540 } 541 if (n == 0) { 542 syslog(LOG_ERR, "%m"); 543 exit(1); 544 } 545 freeaddrinfo(res0); 546 547 if (pidfile(NULL) == -1) 548 syslog(LOG_ERR, "failed to write a pid file: %m"); 549 550 for (;;) { 551 if (poll(fds, n, INFTIM) == -1) { 552 if (errno == EINTR) 553 continue; 554 syslog(LOG_ERR, "poll: %m"); 555 exit(1); 556 } 557 for (i = 0; i < n; i++) { 558 if (fds[i].revents & POLLIN) { 559 fd = accept(fds[i].fd, NULL, NULL); 560 if (fd == -1) { 561 syslog(LOG_ERR, "accept: %m"); 562 continue; 563 } 564 switch (fork()) { 565 case -1: 566 syslog(LOG_ERR, "fork: %m"); 567 break; 568 case 0: 569 goto child; 570 /* NOTREACHED */ 571 } 572 (void)close(fd); 573 } 574 } 575 } 576 child: 577 (void)dup2(fd, STDIN_FILENO); 578 (void)dup2(fd, STDOUT_FILENO); 579 (void)dup2(fd, STDERR_FILENO); 580 for (i = 0; i < n; i++) 581 (void)close(socks[i]); 582 } 583 584 memset((char *)&his_addr, 0, sizeof(his_addr)); 585 addrlen = sizeof(his_addr.si_su); 586 if (getpeername(0, (struct sockaddr *)&his_addr.si_su, &addrlen) < 0) { 587 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 588 exit(1); 589 } 590 his_addr.su_len = addrlen; 591 memset((char *)&ctrl_addr, 0, sizeof(ctrl_addr)); 592 addrlen = sizeof(ctrl_addr.si_su); 593 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 594 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 595 exit(1); 596 } 597 ctrl_addr.su_len = addrlen; 598 #ifdef INET6 599 if (his_addr.su_family == AF_INET6 600 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_6addr)) { 601 #if 1 602 /* 603 * IPv4 control connection arrived to AF_INET6 socket. 604 * I hate to do this, but this is the easiest solution. 605 * 606 * The assumption is untrue on SIIT environment. 607 */ 608 struct sockinet tmp_addr; 609 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 610 611 tmp_addr = his_addr; 612 memset(&his_addr, 0, sizeof(his_addr)); 613 his_addr.su_family = AF_INET; 614 his_addr.su_len = sizeof(his_addr.si_su.su_sin); 615 memcpy(&his_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 616 sizeof(his_addr.su_addr)); 617 his_addr.su_port = tmp_addr.su_port; 618 619 tmp_addr = ctrl_addr; 620 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 621 ctrl_addr.su_family = AF_INET; 622 ctrl_addr.su_len = sizeof(ctrl_addr.si_su.su_sin); 623 memcpy(&ctrl_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 624 sizeof(ctrl_addr.su_addr)); 625 ctrl_addr.su_port = tmp_addr.su_port; 626 #else 627 while (fgets(line, sizeof(line), fd) != NULL) { 628 if ((cp = strchr(line, '\n')) != NULL) 629 *cp = '\0'; 630 reply(-530, "%s", line); 631 } 632 (void) fflush(stdout); 633 (void) fclose(fd); 634 reply(530, 635 "Connection from IPv4 mapped address is not supported."); 636 exit(0); 637 #endif 638 639 mapped = 1; 640 } else 641 #endif /* INET6 */ 642 mapped = 0; 643 #ifdef IP_TOS 644 if (!mapped && his_addr.su_family == AF_INET) { 645 tos = IPTOS_LOWDELAY; 646 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 647 sizeof(int)) < 0) 648 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 649 } 650 #endif 651 /* if the hostname hasn't been given, attempt to determine it */ 652 if (hostname[0] == '\0') { 653 if (getnameinfo((struct sockaddr *)&ctrl_addr.si_su, 654 ctrl_addr.su_len, hostname, sizeof(hostname), NULL, 0, 0) 655 != 0) 656 (void)gethostname(hostname, sizeof(hostname)); 657 hostname[sizeof(hostname) - 1] = '\0'; 658 } 659 660 /* set this here so klogin can use it... */ 661 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 662 663 (void) freopen(_PATH_DEVNULL, "w", stderr); 664 665 memset(&sa, 0, sizeof(sa)); 666 sa.sa_handler = SIG_DFL; 667 sa.sa_flags = SA_RESTART; 668 sigemptyset(&sa.sa_mask); 669 (void) sigaction(SIGCHLD, &sa, NULL); 670 671 sa.sa_handler = sigquit; 672 sa.sa_flags = SA_RESTART; 673 sigfillset(&sa.sa_mask); /* block all sigs in these handlers */ 674 (void) sigaction(SIGHUP, &sa, NULL); 675 (void) sigaction(SIGINT, &sa, NULL); 676 (void) sigaction(SIGQUIT, &sa, NULL); 677 (void) sigaction(SIGTERM, &sa, NULL); 678 sa.sa_handler = lostconn; 679 (void) sigaction(SIGPIPE, &sa, NULL); 680 sa.sa_handler = toolong; 681 (void) sigaction(SIGALRM, &sa, NULL); 682 sa.sa_handler = sigurg; 683 (void) sigaction(SIGURG, &sa, NULL); 684 685 /* Try to handle urgent data inline */ 686 #ifdef SO_OOBINLINE 687 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 688 syslog(LOG_WARNING, "setsockopt: %m"); 689 #endif 690 /* Set keepalives on the socket to detect dropped connections. */ 691 #ifdef SO_KEEPALIVE 692 keepalive = 1; 693 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 694 sizeof(int)) < 0) 695 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 696 #endif 697 698 #ifdef F_SETOWN 699 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 700 syslog(LOG_WARNING, "fcntl F_SETOWN: %m"); 701 #endif 702 logremotehost(&his_addr); 703 /* 704 * Set up default state 705 */ 706 data = -1; 707 type = TYPE_A; 708 form = FORM_N; 709 stru = STRU_F; 710 mode = MODE_S; 711 tmpline[0] = '\0'; 712 hasyyerrored = 0; 713 714 #ifdef KERBEROS5 715 kerror = krb5_init_context(&kcontext); 716 if (kerror) { 717 syslog(LOG_ERR, "%s when initializing Kerberos context", 718 error_message(kerror)); 719 exit(0); 720 } 721 #endif /* KERBEROS5 */ 722 723 init_curclass(); 724 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 725 curclass.type = CLASS_REAL; 726 727 /* If logins are disabled, print out the message. */ 728 if (display_file(_PATH_NOLOGIN, 530)) { 729 reply(530, "System not available."); 730 exit(0); 731 } 732 (void)display_file(conffilename(_NAME_FTPWELCOME), 220); 733 /* reply(220,) must follow */ 734 if (EMPTYSTR(version)) 735 reply(220, "%s FTP server ready.", hostname); 736 else 737 reply(220, "%s FTP server (%s) ready.", hostname, version); 738 739 if (xferlogname != NULL) { 740 xferlogfd = open(xferlogname, O_WRONLY | O_APPEND | O_CREAT, 741 0660); 742 if (xferlogfd == -1) 743 syslog(LOG_WARNING, "open xferlog `%s': %m", 744 xferlogname); 745 else 746 doxferlog |= 2; 747 } 748 749 ftp_loop(); 750 /* NOTREACHED */ 751 } 752 753 static void 754 lostconn(int signo) 755 { 756 757 if (ftpd_debug) 758 syslog(LOG_DEBUG, "lost connection"); 759 dologout(1); 760 } 761 762 static void 763 toolong(int signo) 764 { 765 766 /* XXXSIGRACE */ 767 reply(421, 768 "Timeout (" LLF " seconds): closing control connection.", 769 (LLT)curclass.timeout); 770 if (logging) 771 syslog(LOG_INFO, "User %s timed out after " LLF " seconds", 772 (pw ? pw->pw_name : "unknown"), (LLT)curclass.timeout); 773 dologout(1); 774 } 775 776 static void 777 sigquit(int signo) 778 { 779 780 if (ftpd_debug) 781 syslog(LOG_DEBUG, "got signal %d", signo); 782 dologout(1); 783 } 784 785 static void 786 sigurg(int signo) 787 { 788 789 urgflag = 1; 790 } 791 792 793 /* 794 * Save the result of a getpwnam. Used for USER command, since 795 * the data returned must not be clobbered by any other command 796 * (e.g., globbing). 797 */ 798 static struct passwd * 799 sgetpwnam(const char *name) 800 { 801 static struct passwd save; 802 struct passwd *p; 803 804 if ((p = getpwnam(name)) == NULL) 805 return (p); 806 if (save.pw_name) { 807 free((char *)save.pw_name); 808 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 809 free((char *)save.pw_passwd); 810 free((char *)save.pw_gecos); 811 free((char *)save.pw_dir); 812 free((char *)save.pw_shell); 813 } 814 save = *p; 815 save.pw_name = ftpd_strdup(p->pw_name); 816 save.pw_passwd = ftpd_strdup(p->pw_passwd); 817 save.pw_gecos = ftpd_strdup(p->pw_gecos); 818 save.pw_dir = ftpd_strdup(p->pw_dir); 819 save.pw_shell = ftpd_strdup(p->pw_shell); 820 return (&save); 821 } 822 823 static int login_attempts; /* number of failed login attempts */ 824 static int askpasswd; /* had USER command, ask for PASSwd */ 825 static int permitted; /* USER permitted */ 826 827 /* 828 * USER command. 829 * Sets global passwd pointer pw if named account exists and is acceptable; 830 * sets askpasswd if a PASS command is expected. If logged in previously, 831 * need to reset state. If name is "ftp" or "anonymous", the name is not in 832 * _NAME_FTPUSERS, and ftp account exists, set guest and pw, then just return. 833 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 834 * requesting login privileges. Disallow anyone who does not have a standard 835 * shell as returned by getusershell(). Disallow anyone mentioned in the file 836 * _NAME_FTPUSERS to allow people such as root and uucp to be avoided. 837 */ 838 void 839 user(const char *name) 840 { 841 char *class; 842 #ifdef LOGIN_CAP 843 login_cap_t *lc = NULL; 844 #endif 845 846 class = NULL; 847 if (logged_in) { 848 switch (curclass.type) { 849 case CLASS_GUEST: 850 reply(530, "Can't change user from guest login."); 851 return; 852 case CLASS_CHROOT: 853 reply(530, "Can't change user from chroot user."); 854 return; 855 case CLASS_REAL: 856 if (dropprivs) { 857 reply(530, "Can't change user."); 858 return; 859 } 860 end_login(); 861 break; 862 default: 863 abort(); 864 } 865 } 866 867 #if defined(KERBEROS) 868 kdestroy(); 869 #endif 870 #if defined(KERBEROS5) 871 k5destroy(); 872 #endif 873 874 curclass.type = CLASS_REAL; 875 askpasswd = 0; 876 permitted = 0; 877 878 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 879 /* need `pw' setup for checkaccess() and checkuser () */ 880 if ((pw = sgetpwnam("ftp")) == NULL) 881 reply(530, "User %s unknown.", name); 882 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 883 reply(530, "User %s access denied.", name); 884 else { 885 curclass.type = CLASS_GUEST; 886 askpasswd = 1; 887 reply(331, 888 "Guest login ok, type your name as password."); 889 } 890 if (!askpasswd) { 891 if (logging) 892 syslog(LOG_NOTICE, 893 "ANONYMOUS FTP LOGIN REFUSED FROM %s", 894 remotehost); 895 end_login(); 896 goto cleanup_user; 897 } 898 name = "ftp"; 899 } else 900 pw = sgetpwnam(name); 901 902 strlcpy(curname, name, curname_len); 903 904 /* check user in /etc/ftpusers, and setup class */ 905 permitted = checkuser(_NAME_FTPUSERS, curname, 1, 0, &class); 906 907 /* check user in /etc/ftpchroot */ 908 lc = login_getpwclass(pw); 909 if (checkuser(_NAME_FTPCHROOT, curname, 0, 0, NULL) 910 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 911 || login_getcapbool(lc, "ftp-chroot", 0) 912 #endif 913 ) { 914 if (curclass.type == CLASS_GUEST) { 915 syslog(LOG_NOTICE, 916 "Can't change guest user to chroot class; remove entry in %s", 917 _NAME_FTPCHROOT); 918 exit(1); 919 } 920 curclass.type = CLASS_CHROOT; 921 } 922 /* determine default class */ 923 if (class == NULL) { 924 switch (curclass.type) { 925 case CLASS_GUEST: 926 class = ftpd_strdup("guest"); 927 break; 928 case CLASS_CHROOT: 929 class = ftpd_strdup("chroot"); 930 break; 931 case CLASS_REAL: 932 class = ftpd_strdup("real"); 933 break; 934 default: 935 syslog(LOG_ERR, "unknown curclass.type %d; aborting", 936 curclass.type); 937 abort(); 938 } 939 } 940 /* parse ftpd.conf, setting up various parameters */ 941 parse_conf(class); 942 /* if not guest user, check for valid shell */ 943 if (pw == NULL) 944 permitted = 0; 945 else { 946 const char *cp, *shell; 947 948 if ((shell = pw->pw_shell) == NULL || *shell == 0) 949 shell = _PATH_BSHELL; 950 while ((cp = getusershell()) != NULL) 951 if (strcmp(cp, shell) == 0) 952 break; 953 endusershell(); 954 if (cp == NULL && curclass.type != CLASS_GUEST) 955 permitted = 0; 956 } 957 958 /* deny quickly (after USER not PASS) if requested */ 959 if (CURCLASS_FLAGS_ISSET(denyquick) && !permitted) { 960 reply(530, "User %s may not use FTP.", curname); 961 if (logging) 962 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 963 remotehost, curname); 964 end_login(); 965 goto cleanup_user; 966 } 967 968 /* if haven't asked yet (i.e, not anon), ask now */ 969 if (!askpasswd) { 970 askpasswd = 1; 971 #ifdef SKEY 972 if (skey_haskey(curname) == 0) { 973 const char *myskey; 974 975 myskey = skey_keyinfo(curname); 976 reply(331, "Password [ %s ] required for %s.", 977 myskey ? myskey : "error getting challenge", 978 curname); 979 } else 980 #endif 981 reply(331, "Password required for %s.", curname); 982 } 983 984 cleanup_user: 985 #ifdef LOGIN_CAP 986 login_close(lc); 987 #endif 988 /* 989 * Delay before reading passwd after first failed 990 * attempt to slow down passwd-guessing programs. 991 */ 992 if (login_attempts) 993 sleep((unsigned) login_attempts); 994 995 if (class) 996 free(class); 997 } 998 999 /* 1000 * Determine whether something is to happen (allow access, chroot) 1001 * for a user. Each line is a shell-style glob followed by 1002 * `yes' or `no'. 1003 * 1004 * For backward compatibility, `allow' and `deny' are synonymns 1005 * for `yes' and `no', respectively. 1006 * 1007 * Each glob is matched against the username in turn, and the first 1008 * match found is used. If no match is found, the result is the 1009 * argument `def'. If a match is found but without and explicit 1010 * `yes'/`no', the result is the opposite of def. 1011 * 1012 * If the file doesn't exist at all, the result is the argument 1013 * `nofile' 1014 * 1015 * Any line starting with `#' is considered a comment and ignored. 1016 * 1017 * Returns 0 if the user is denied, or 1 if they are allowed. 1018 * 1019 * NOTE: needs struct passwd *pw setup before use. 1020 */ 1021 static int 1022 checkuser(const char *fname, const char *name, int def, int nofile, 1023 char **retclass) 1024 { 1025 FILE *fd; 1026 int retval; 1027 char *word, *perm, *class, *buf, *p; 1028 size_t len, line; 1029 1030 retval = def; 1031 if (retclass != NULL) 1032 *retclass = NULL; 1033 if ((fd = fopen(conffilename(fname), "r")) == NULL) 1034 return nofile; 1035 1036 line = 0; 1037 for (; 1038 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 1039 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 1040 free(buf), buf = NULL) { 1041 word = perm = class = NULL; 1042 p = buf; 1043 if (len < 1) 1044 continue; 1045 if (p[len - 1] == '\n') 1046 p[--len] = '\0'; 1047 if (EMPTYSTR(p)) 1048 continue; 1049 1050 NEXTWORD(p, word); 1051 NEXTWORD(p, perm); 1052 NEXTWORD(p, class); 1053 if (EMPTYSTR(word)) 1054 continue; 1055 if (!EMPTYSTR(class)) { 1056 if (strcasecmp(class, "all") == 0 || 1057 strcasecmp(class, "none") == 0) { 1058 syslog(LOG_WARNING, 1059 "%s line %d: illegal user-defined class `%s' - skipping entry", 1060 fname, (int)line, class); 1061 continue; 1062 } 1063 } 1064 1065 /* have a host specifier */ 1066 if ((p = strchr(word, '@')) != NULL) { 1067 unsigned long net, mask, addr; 1068 int bits; 1069 1070 *p++ = '\0'; 1071 /* check against network or CIDR */ 1072 if (isdigit((unsigned char)*p) && 1073 (bits = inet_net_pton(AF_INET, p, 1074 &net, sizeof(net))) != -1) { 1075 net = ntohl(net); 1076 mask = 0xffffffffU << (32 - bits); 1077 addr = ntohl(his_addr.su_addr.s_addr); 1078 if ((addr & mask) != net) 1079 continue; 1080 1081 /* check against hostname glob */ 1082 } else if (fnmatch(p, remotehost, FNM_CASEFOLD) != 0) 1083 continue; 1084 } 1085 1086 /* have a group specifier */ 1087 if ((p = strchr(word, ':')) != NULL) { 1088 gid_t *groups, *ng; 1089 int gsize, i, found; 1090 1091 if (pw == NULL) 1092 continue; /* no match for unknown user */ 1093 *p++ = '\0'; 1094 groups = NULL; 1095 gsize = 16; 1096 do { 1097 ng = realloc(groups, gsize * sizeof(gid_t)); 1098 if (ng == NULL) 1099 fatal( 1100 "Local resource failure: realloc"); 1101 groups = ng; 1102 } while (getgrouplist(pw->pw_name, pw->pw_gid, 1103 groups, &gsize) == -1); 1104 found = 0; 1105 for (i = 0; i < gsize; i++) { 1106 struct group *g; 1107 1108 if ((g = getgrgid(groups[i])) == NULL) 1109 continue; 1110 if (fnmatch(p, g->gr_name, 0) == 0) { 1111 found = 1; 1112 break; 1113 } 1114 } 1115 free(groups); 1116 if (!found) 1117 continue; 1118 } 1119 1120 /* check against username glob */ 1121 if (fnmatch(word, name, 0) != 0) 1122 continue; 1123 1124 if (perm != NULL && 1125 ((strcasecmp(perm, "allow") == 0) || 1126 (strcasecmp(perm, "yes") == 0))) 1127 retval = 1; 1128 else if (perm != NULL && 1129 ((strcasecmp(perm, "deny") == 0) || 1130 (strcasecmp(perm, "no") == 0))) 1131 retval = 0; 1132 else 1133 retval = !def; 1134 if (!EMPTYSTR(class) && retclass != NULL) 1135 *retclass = ftpd_strdup(class); 1136 free(buf); 1137 break; 1138 } 1139 (void) fclose(fd); 1140 return (retval); 1141 } 1142 1143 /* 1144 * Check if user is allowed by /etc/ftpusers 1145 * returns 1 for yes, 0 for no 1146 * 1147 * NOTE: needs struct passwd *pw setup (for checkuser()) 1148 */ 1149 static int 1150 checkaccess(const char *name) 1151 { 1152 1153 return (checkuser(_NAME_FTPUSERS, name, 1, 0, NULL)); 1154 } 1155 1156 static void 1157 login_utmp(const char *line, const char *name, const char *host, 1158 struct sockinet *haddr) 1159 { 1160 #if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP) 1161 struct timeval tv; 1162 (void)gettimeofday(&tv, NULL); 1163 #endif 1164 #ifdef SUPPORT_UTMPX 1165 if (doutmp) { 1166 (void)memset(&utmpx, 0, sizeof(utmpx)); 1167 utmpx.ut_tv = tv; 1168 utmpx.ut_pid = getpid(); 1169 utmpx.ut_id[0] = 'f'; 1170 utmpx.ut_id[1] = 't'; 1171 utmpx.ut_id[2] = 'p'; 1172 utmpx.ut_id[3] = '*'; 1173 utmpx.ut_type = USER_PROCESS; 1174 (void)strncpy(utmpx.ut_name, name, sizeof(utmpx.ut_name)); 1175 (void)strncpy(utmpx.ut_line, line, sizeof(utmpx.ut_line)); 1176 (void)strncpy(utmpx.ut_host, host, sizeof(utmpx.ut_host)); 1177 (void)memcpy(&utmpx.ut_ss, &haddr->si_su, haddr->su_len); 1178 ftpd_loginx(&utmpx); 1179 } 1180 if (dowtmp) 1181 ftpd_logwtmpx(line, name, host, haddr, 0, USER_PROCESS); 1182 #endif 1183 #ifdef SUPPORT_UTMP 1184 if (doutmp) { 1185 (void)memset(&utmp, 0, sizeof(utmp)); 1186 (void)time(&utmp.ut_time); 1187 (void)strncpy(utmp.ut_name, name, sizeof(utmp.ut_name)); 1188 (void)strncpy(utmp.ut_line, line, sizeof(utmp.ut_line)); 1189 (void)strncpy(utmp.ut_host, host, sizeof(utmp.ut_host)); 1190 ftpd_login(&utmp); 1191 } 1192 if (dowtmp) 1193 ftpd_logwtmp(line, name, host); 1194 #endif 1195 } 1196 1197 static void 1198 logout_utmp(void) 1199 { 1200 #ifdef SUPPORT_UTMPX 1201 int okwtmpx = dowtmp; 1202 #endif 1203 #ifdef SUPPORT_UTMP 1204 int okwtmp = dowtmp; 1205 #endif 1206 if (logged_in) { 1207 #ifdef SUPPORT_UTMPX 1208 if (doutmp) 1209 okwtmpx &= ftpd_logoutx(ttyline, 0, DEAD_PROCESS); 1210 if (okwtmpx) 1211 ftpd_logwtmpx(ttyline, "", "", NULL, 0, DEAD_PROCESS); 1212 #endif 1213 #ifdef SUPPORT_UTMP 1214 if (doutmp) 1215 okwtmp &= ftpd_logout(ttyline); 1216 if (okwtmp) 1217 ftpd_logwtmp(ttyline, "", ""); 1218 #endif 1219 } 1220 } 1221 1222 /* 1223 * Terminate login as previous user (if any), resetting state; 1224 * used when USER command is given or login fails. 1225 */ 1226 static void 1227 end_login(void) 1228 { 1229 #ifdef USE_PAM 1230 int e; 1231 #endif 1232 logout_utmp(); 1233 show_chdir_messages(-1); /* flush chdir cache */ 1234 if (pw != NULL && pw->pw_passwd != NULL) 1235 memset(pw->pw_passwd, 0, strlen(pw->pw_passwd)); 1236 pw = NULL; 1237 logged_in = 0; 1238 askpasswd = 0; 1239 permitted = 0; 1240 quietmessages = 0; 1241 gidcount = 0; 1242 curclass.type = CLASS_REAL; 1243 (void) seteuid((uid_t)0); 1244 #ifdef LOGIN_CAP 1245 setusercontext(NULL, getpwuid(0), 0, 1246 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1247 #endif 1248 #ifdef USE_PAM 1249 if (pamh) { 1250 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1251 syslog(LOG_ERR, "pam_setcred: %s", 1252 pam_strerror(pamh, e)); 1253 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1254 syslog(LOG_ERR, "pam_close_session: %s", 1255 pam_strerror(pamh, e)); 1256 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1257 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1258 pamh = NULL; 1259 } 1260 #endif 1261 } 1262 1263 void 1264 pass(const char *passwd) 1265 { 1266 int rval; 1267 char root[MAXPATHLEN]; 1268 #ifdef LOGIN_CAP 1269 login_cap_t *lc = NULL; 1270 #endif 1271 #ifdef USE_PAM 1272 int e; 1273 #endif 1274 if (logged_in || askpasswd == 0) { 1275 reply(503, "Login with USER first."); 1276 return; 1277 } 1278 askpasswd = 0; 1279 if (curclass.type != CLASS_GUEST) { 1280 /* "ftp" is the only account allowed with no password */ 1281 if (pw == NULL) { 1282 rval = 1; /* failure below */ 1283 goto skip; 1284 } 1285 #ifdef USE_PAM 1286 rval = auth_pam(&pw, passwd); 1287 #ifdef notdef 1288 /* If PAM fails, we proceed with other authentications */ 1289 if (rval >= 0) { 1290 goto skip; 1291 } 1292 #else 1293 /* If PAM fails, that's it */ 1294 goto skip; 1295 #endif 1296 #endif 1297 #if defined(KERBEROS) 1298 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 1299 rval = 0; 1300 goto skip; 1301 } 1302 #endif 1303 #if defined(KERBEROS5) 1304 if (k5login(pw, "", hostname, (char *)passwd) == 0) { 1305 rval = 0; 1306 goto skip; 1307 } 1308 #endif 1309 #ifdef SKEY 1310 if (skey_haskey(pw->pw_name) == 0) { 1311 char *p; 1312 int r; 1313 1314 p = ftpd_strdup(passwd); 1315 r = skey_passcheck(pw->pw_name, p); 1316 free(p); 1317 if (r != -1) { 1318 rval = 0; 1319 goto skip; 1320 } 1321 } 1322 #endif 1323 if (!sflag) 1324 rval = checkpassword(pw, passwd); 1325 else 1326 rval = 1; 1327 1328 skip: 1329 1330 /* 1331 * If rval > 0, the user failed the authentication check 1332 * above. If rval == 0, either Kerberos or local 1333 * authentication succeeded. 1334 */ 1335 if (rval) { 1336 reply(530, "%s", rval == 2 ? "Password expired." : 1337 "Login incorrect."); 1338 if (logging) { 1339 syslog(LOG_NOTICE, 1340 "FTP LOGIN FAILED FROM %s", remotehost); 1341 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1342 "FTP LOGIN FAILED FROM %s, %s", 1343 remotehost, curname); 1344 } 1345 pw = NULL; 1346 if (login_attempts++ >= 5) { 1347 syslog(LOG_NOTICE, 1348 "repeated login failures from %s", 1349 remotehost); 1350 exit(0); 1351 } 1352 return; 1353 } 1354 } 1355 1356 /* password ok; check if anything else prevents login */ 1357 if (! permitted) { 1358 reply(530, "User %s may not use FTP.", pw->pw_name); 1359 if (logging) 1360 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 1361 remotehost, pw->pw_name); 1362 goto bad; 1363 } 1364 1365 login_attempts = 0; /* this time successful */ 1366 if (setegid((gid_t)pw->pw_gid) < 0) { 1367 reply(550, "Can't set gid."); 1368 goto bad; 1369 } 1370 #ifdef LOGIN_CAP 1371 if ((lc = login_getpwclass(pw)) != NULL) { 1372 #ifdef notyet 1373 char remote_ip[NI_MAXHOST]; 1374 1375 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1376 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1377 NI_NUMERICHOST)) 1378 *remote_ip = 0; 1379 remote_ip[sizeof(remote_ip) - 1] = 0; 1380 if (!auth_hostok(lc, remotehost, remote_ip)) { 1381 syslog(LOG_INFO|LOG_AUTH, 1382 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1383 pw->pw_name); 1384 reply(530, "Permission denied."); 1385 pw = NULL; 1386 return; 1387 } 1388 if (!auth_timeok(lc, time(NULL))) { 1389 reply(530, "Login not available right now."); 1390 pw = NULL; 1391 return; 1392 } 1393 #endif 1394 } 1395 setsid(); 1396 setusercontext(lc, pw, 0, 1397 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1398 LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1399 #else 1400 (void) initgroups(pw->pw_name, pw->pw_gid); 1401 /* cache groups for cmds.c::matchgroup() */ 1402 #endif 1403 #ifdef USE_PAM 1404 if (pamh) { 1405 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1406 syslog(LOG_ERR, "pam_open_session: %s", 1407 pam_strerror(pamh, e)); 1408 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) 1409 != PAM_SUCCESS) { 1410 syslog(LOG_ERR, "pam_setcred: %s", 1411 pam_strerror(pamh, e)); 1412 } 1413 } 1414 #endif 1415 gidcount = getgroups(0, NULL); 1416 if (gidlist) 1417 free(gidlist); 1418 gidlist = malloc(gidcount * sizeof *gidlist); 1419 gidcount = getgroups(gidcount, gidlist); 1420 1421 /* open utmp/wtmp before chroot */ 1422 login_utmp(ttyline, pw->pw_name, remotehost, &his_addr); 1423 1424 logged_in = 1; 1425 1426 connections = 1; 1427 if (dopidfile) 1428 count_users(); 1429 if (curclass.limit != -1 && connections > curclass.limit) { 1430 if (! EMPTYSTR(curclass.limitfile)) 1431 (void)display_file(conffilename(curclass.limitfile), 1432 530); 1433 reply(530, 1434 "User %s access denied, connection limit of " LLF 1435 " reached.", 1436 pw->pw_name, (LLT)curclass.limit); 1437 syslog(LOG_NOTICE, 1438 "Maximum connection limit of " LLF 1439 " for class %s reached, login refused for %s", 1440 (LLT)curclass.limit, curclass.classname, pw->pw_name); 1441 goto bad; 1442 } 1443 1444 homedir[0] = '/'; 1445 switch (curclass.type) { 1446 case CLASS_GUEST: 1447 /* 1448 * We MUST do a chdir() after the chroot. Otherwise 1449 * the old current directory will be accessible as "." 1450 * outside the new root! 1451 */ 1452 format_path(root, 1453 curclass.chroot ? curclass.chroot : 1454 anondir ? anondir : 1455 pw->pw_dir); 1456 format_path(homedir, 1457 curclass.homedir ? curclass.homedir : 1458 "/"); 1459 if (EMPTYSTR(homedir)) 1460 homedir[0] = '/'; 1461 if (EMPTYSTR(root) || chroot(root) < 0) { 1462 syslog(LOG_NOTICE, 1463 "GUEST user %s: can't chroot to %s: %m", 1464 pw->pw_name, root); 1465 goto bad_guest; 1466 } 1467 if (chdir(homedir) < 0) { 1468 syslog(LOG_NOTICE, 1469 "GUEST user %s: can't chdir to %s: %m", 1470 pw->pw_name, homedir); 1471 bad_guest: 1472 reply(550, "Can't set guest privileges."); 1473 goto bad; 1474 } 1475 break; 1476 case CLASS_CHROOT: 1477 format_path(root, 1478 curclass.chroot ? curclass.chroot : 1479 pw->pw_dir); 1480 format_path(homedir, 1481 curclass.homedir ? curclass.homedir : 1482 "/"); 1483 if (EMPTYSTR(homedir)) 1484 homedir[0] = '/'; 1485 if (EMPTYSTR(root) || chroot(root) < 0) { 1486 syslog(LOG_NOTICE, 1487 "CHROOT user %s: can't chroot to %s: %m", 1488 pw->pw_name, root); 1489 goto bad_chroot; 1490 } 1491 if (chdir(homedir) < 0) { 1492 syslog(LOG_NOTICE, 1493 "CHROOT user %s: can't chdir to %s: %m", 1494 pw->pw_name, homedir); 1495 bad_chroot: 1496 reply(550, "Can't change root."); 1497 goto bad; 1498 } 1499 break; 1500 case CLASS_REAL: 1501 /* only chroot REAL if explicitly requested */ 1502 if (! EMPTYSTR(curclass.chroot)) { 1503 format_path(root, curclass.chroot); 1504 if (EMPTYSTR(root) || chroot(root) < 0) { 1505 syslog(LOG_NOTICE, 1506 "REAL user %s: can't chroot to %s: %m", 1507 pw->pw_name, root); 1508 goto bad_chroot; 1509 } 1510 } 1511 format_path(homedir, 1512 curclass.homedir ? curclass.homedir : 1513 pw->pw_dir); 1514 if (EMPTYSTR(homedir) || chdir(homedir) < 0) { 1515 if (chdir("/") < 0) { 1516 syslog(LOG_NOTICE, 1517 "REAL user %s: can't chdir to %s: %m", 1518 pw->pw_name, 1519 !EMPTYSTR(homedir) ? homedir : "/"); 1520 reply(530, 1521 "User %s: can't change directory to %s.", 1522 pw->pw_name, 1523 !EMPTYSTR(homedir) ? homedir : "/"); 1524 goto bad; 1525 } else { 1526 reply(-230, 1527 "No directory! Logging in with home=/"); 1528 homedir[0] = '/'; 1529 } 1530 } 1531 break; 1532 } 1533 #ifndef LOGIN_CAP 1534 setsid(); 1535 setlogin(pw->pw_name); 1536 #endif 1537 if (dropprivs || 1538 (curclass.type != CLASS_REAL && 1539 ntohs(ctrl_addr.su_port) > IPPORT_RESERVED + 1)) { 1540 dropprivs++; 1541 if (setgid((gid_t)pw->pw_gid) < 0) { 1542 reply(550, "Can't set gid."); 1543 goto bad; 1544 } 1545 if (setuid((uid_t)pw->pw_uid) < 0) { 1546 reply(550, "Can't set uid."); 1547 goto bad; 1548 } 1549 } else { 1550 if (seteuid((uid_t)pw->pw_uid) < 0) { 1551 reply(550, "Can't set uid."); 1552 goto bad; 1553 } 1554 } 1555 setenv("HOME", homedir, 1); 1556 1557 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 1558 quietmessages = 1; 1559 1560 /* 1561 * Display a login message, if it exists. 1562 * N.B. reply(230,) must follow the message. 1563 */ 1564 if (! EMPTYSTR(curclass.motd)) 1565 (void)display_file(conffilename(curclass.motd), 230); 1566 show_chdir_messages(230); 1567 if (curclass.type == CLASS_GUEST) { 1568 char *p; 1569 1570 reply(230, "Guest login ok, access restrictions apply."); 1571 #if HAVE_SETPROCTITLE 1572 snprintf(proctitle, sizeof(proctitle), 1573 "%s: anonymous/%s", remotehost, passwd); 1574 setproctitle("%s", proctitle); 1575 #endif /* HAVE_SETPROCTITLE */ 1576 if (logging) 1577 syslog(LOG_INFO, 1578 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 1579 remotehost, passwd, 1580 curclass.classname, CURCLASSTYPE); 1581 /* store guest password reply into pw_passwd */ 1582 REASSIGN(pw->pw_passwd, ftpd_strdup(passwd)); 1583 for (p = pw->pw_passwd; *p; p++) 1584 if (!isgraph((unsigned char)*p)) 1585 *p = '_'; 1586 } else { 1587 reply(230, "User %s logged in.", pw->pw_name); 1588 #if HAVE_SETPROCTITLE 1589 snprintf(proctitle, sizeof(proctitle), 1590 "%s: %s", remotehost, pw->pw_name); 1591 setproctitle("%s", proctitle); 1592 #endif /* HAVE_SETPROCTITLE */ 1593 if (logging) 1594 syslog(LOG_INFO, 1595 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1596 remotehost, pw->pw_name, 1597 curclass.classname, CURCLASSTYPE); 1598 } 1599 (void) umask(curclass.umask); 1600 #ifdef LOGIN_CAP 1601 login_close(lc); 1602 #endif 1603 return; 1604 1605 bad: 1606 #ifdef LOGIN_CAP 1607 login_close(lc); 1608 #endif 1609 /* Forget all about it... */ 1610 end_login(); 1611 } 1612 1613 void 1614 retrieve(char *argv[], const char *name) 1615 { 1616 FILE *fin, *dout; 1617 struct stat st; 1618 int (*closefunc)(FILE *) = NULL; 1619 int dolog, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1620 struct timeval start, finish, td, *tdp; 1621 struct rusage rusage_before, rusage_after; 1622 const char *dispname; 1623 char *error; 1624 1625 sendrv = closerv = stderrfd = -1; 1626 isconversion = isdata = isls = dolog = 0; 1627 tdp = NULL; 1628 dispname = name; 1629 fin = dout = NULL; 1630 error = NULL; 1631 if (argv == NULL) { /* if not running a command ... */ 1632 dolog = 1; 1633 isdata = 1; 1634 fin = fopen(name, "r"); 1635 closefunc = fclose; 1636 if (fin == NULL) /* doesn't exist?; try a conversion */ 1637 argv = do_conversion(name); 1638 if (argv != NULL) { 1639 isconversion++; 1640 syslog(LOG_DEBUG, "get command: '%s' on '%s'", 1641 argv[0], name); 1642 } 1643 } 1644 if (argv != NULL) { 1645 char temp[MAXPATHLEN]; 1646 1647 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1648 isls = 1; 1649 stderrfd = -1; 1650 } else { 1651 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1652 stderrfd = mkstemp(temp); 1653 if (stderrfd != -1) 1654 (void)unlink(temp); 1655 } 1656 dispname = argv[0]; 1657 fin = ftpd_popen(argv, "r", stderrfd); 1658 closefunc = ftpd_pclose; 1659 st.st_size = -1; 1660 st.st_blksize = BUFSIZ; 1661 } 1662 if (fin == NULL) { 1663 if (errno != 0) { 1664 perror_reply(550, dispname); 1665 if (dolog) 1666 logxfer("get", -1, name, NULL, NULL, 1667 strerror(errno)); 1668 } 1669 goto cleanupretrieve; 1670 } 1671 byte_count = -1; 1672 if (argv == NULL 1673 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1674 error = "Not a plain file"; 1675 reply(550, "%s: %s.", dispname, error); 1676 goto done; 1677 } 1678 if (restart_point) { 1679 if (type == TYPE_A) { 1680 off_t i; 1681 int c; 1682 1683 for (i = 0; i < restart_point; i++) { 1684 if ((c=getc(fin)) == EOF) { 1685 error = strerror(errno); 1686 perror_reply(550, dispname); 1687 goto done; 1688 } 1689 if (c == '\n') 1690 i++; 1691 } 1692 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1693 error = strerror(errno); 1694 perror_reply(550, dispname); 1695 goto done; 1696 } 1697 } 1698 dout = dataconn(dispname, st.st_size, "w"); 1699 if (dout == NULL) 1700 goto done; 1701 1702 (void)getrusage(RUSAGE_SELF, &rusage_before); 1703 (void)gettimeofday(&start, NULL); 1704 sendrv = send_data(fin, dout, &st, isdata); 1705 (void)gettimeofday(&finish, NULL); 1706 (void)getrusage(RUSAGE_SELF, &rusage_after); 1707 closedataconn(dout); /* close now to affect timing stats */ 1708 timersub(&finish, &start, &td); 1709 tdp = &td; 1710 done: 1711 if (dolog) { 1712 logxfer("get", byte_count, name, NULL, tdp, error); 1713 if (tdp != NULL) 1714 logrusage(&rusage_before, &rusage_after); 1715 } 1716 closerv = (*closefunc)(fin); 1717 if (sendrv == 0) { 1718 FILE *errf; 1719 struct stat sb; 1720 1721 if (!isls && argv != NULL && closerv != 0) { 1722 reply(-226, 1723 "Command returned an exit status of %d", 1724 closerv); 1725 if (isconversion) 1726 syslog(LOG_WARNING, 1727 "retrieve command: '%s' returned %d", 1728 argv[0], closerv); 1729 } 1730 if (!isls && argv != NULL && stderrfd != -1 && 1731 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1732 ((errf = fdopen(stderrfd, "r")) != NULL)) { 1733 char *cp, line[LINE_MAX]; 1734 1735 reply(-226, "Command error messages:"); 1736 rewind(errf); 1737 while (fgets(line, sizeof(line), errf) != NULL) { 1738 if ((cp = strchr(line, '\n')) != NULL) 1739 *cp = '\0'; 1740 reply(0, " %s", line); 1741 } 1742 (void) fflush(stdout); 1743 (void) fclose(errf); 1744 /* a reply(226,) must follow */ 1745 } 1746 reply(226, "Transfer complete."); 1747 } 1748 cleanupretrieve: 1749 if (stderrfd != -1) 1750 (void)close(stderrfd); 1751 if (isconversion) 1752 free(argv); 1753 } 1754 1755 void 1756 store(const char *name, const char *fmode, int unique) 1757 { 1758 FILE *fout, *din; 1759 struct stat st; 1760 int (*closefunc)(FILE *); 1761 struct timeval start, finish, td, *tdp; 1762 char *desc, *error; 1763 1764 din = NULL; 1765 desc = (*fmode == 'w') ? "put" : "append"; 1766 error = NULL; 1767 if (unique && stat(name, &st) == 0 && 1768 (name = gunique(name)) == NULL) { 1769 logxfer(desc, -1, name, NULL, NULL, 1770 "cannot create unique file"); 1771 goto cleanupstore; 1772 } 1773 1774 if (restart_point) 1775 fmode = "r+"; 1776 fout = fopen(name, fmode); 1777 closefunc = fclose; 1778 tdp = NULL; 1779 if (fout == NULL) { 1780 perror_reply(553, name); 1781 logxfer(desc, -1, name, NULL, NULL, strerror(errno)); 1782 goto cleanupstore; 1783 } 1784 byte_count = -1; 1785 if (restart_point) { 1786 if (type == TYPE_A) { 1787 off_t i; 1788 int c; 1789 1790 for (i = 0; i < restart_point; i++) { 1791 if ((c=getc(fout)) == EOF) { 1792 error = strerror(errno); 1793 perror_reply(550, name); 1794 goto done; 1795 } 1796 if (c == '\n') 1797 i++; 1798 } 1799 /* 1800 * We must do this seek to "current" position 1801 * because we are changing from reading to 1802 * writing. 1803 */ 1804 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1805 error = strerror(errno); 1806 perror_reply(550, name); 1807 goto done; 1808 } 1809 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1810 error = strerror(errno); 1811 perror_reply(550, name); 1812 goto done; 1813 } 1814 } 1815 din = dataconn(name, (off_t)-1, "r"); 1816 if (din == NULL) 1817 goto done; 1818 (void)gettimeofday(&start, NULL); 1819 if (receive_data(din, fout) == 0) { 1820 if (unique) 1821 reply(226, "Transfer complete (unique file name:%s).", 1822 name); 1823 else 1824 reply(226, "Transfer complete."); 1825 } 1826 (void)gettimeofday(&finish, NULL); 1827 closedataconn(din); /* close now to affect timing stats */ 1828 timersub(&finish, &start, &td); 1829 tdp = &td; 1830 done: 1831 logxfer(desc, byte_count, name, NULL, tdp, error); 1832 (*closefunc)(fout); 1833 cleanupstore: 1834 ; 1835 } 1836 1837 static FILE * 1838 getdatasock(const char *fmode) 1839 { 1840 int on, s, t, tries; 1841 in_port_t port; 1842 1843 on = 1; 1844 if (data >= 0) 1845 return (fdopen(data, fmode)); 1846 if (! dropprivs) 1847 (void) seteuid((uid_t)0); 1848 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1849 if (s < 0) 1850 goto bad; 1851 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1852 (char *) &on, sizeof(on)) < 0) 1853 goto bad; 1854 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1855 (char *) &on, sizeof(on)) < 0) 1856 goto bad; 1857 /* anchor socket to avoid multi-homing problems */ 1858 data_source = ctrl_addr; 1859 /* 1860 * By default source port for PORT connctions is 1861 * ctrlport-1 (see RFC959 section 5.2). 1862 * However, if privs have been dropped and that 1863 * would be < IPPORT_RESERVED, use a random port 1864 * instead. 1865 */ 1866 if (dataport) 1867 port = dataport; 1868 else 1869 port = ntohs(ctrl_addr.su_port) - 1; 1870 if (dropprivs && port < IPPORT_RESERVED) 1871 port = 0; /* use random port */ 1872 data_source.su_port = htons(port); 1873 1874 for (tries = 1; ; tries++) { 1875 if (bind(s, (struct sockaddr *)&data_source.si_su, 1876 data_source.su_len) >= 0) 1877 break; 1878 if (errno != EADDRINUSE || tries > 10) 1879 goto bad; 1880 sleep(tries); 1881 } 1882 if (! dropprivs) 1883 (void) seteuid((uid_t)pw->pw_uid); 1884 #ifdef IP_TOS 1885 if (!mapped && ctrl_addr.su_family == AF_INET) { 1886 on = IPTOS_THROUGHPUT; 1887 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1888 sizeof(int)) < 0) 1889 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1890 } 1891 #endif 1892 return (fdopen(s, fmode)); 1893 bad: 1894 /* Return the real value of errno (close may change it) */ 1895 t = errno; 1896 if (! dropprivs) 1897 (void) seteuid((uid_t)pw->pw_uid); 1898 (void) close(s); 1899 errno = t; 1900 return (NULL); 1901 } 1902 1903 FILE * 1904 dataconn(const char *name, off_t size, const char *fmode) 1905 { 1906 char sizebuf[32]; 1907 FILE *file; 1908 int retry, tos, keepalive, conerrno; 1909 1910 file_size = size; 1911 byte_count = 0; 1912 if (size != (off_t) -1) 1913 (void)snprintf(sizebuf, sizeof(sizebuf), " (" LLF " byte%s)", 1914 (LLT)size, PLURAL(size)); 1915 else 1916 sizebuf[0] = '\0'; 1917 if (pdata >= 0) { 1918 struct sockinet from; 1919 int s; 1920 socklen_t fromlen = sizeof(from.su_len); 1921 1922 (void) alarm(curclass.timeout); 1923 s = accept(pdata, (struct sockaddr *)&from.si_su, &fromlen); 1924 (void) alarm(0); 1925 if (s < 0) { 1926 reply(425, "Can't open data connection."); 1927 (void) close(pdata); 1928 pdata = -1; 1929 return (NULL); 1930 } 1931 (void) close(pdata); 1932 pdata = s; 1933 switch (from.su_family) { 1934 case AF_INET: 1935 #ifdef IP_TOS 1936 if (!mapped) { 1937 tos = IPTOS_THROUGHPUT; 1938 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1939 (char *)&tos, sizeof(int)); 1940 } 1941 break; 1942 #endif 1943 } 1944 /* Set keepalives on the socket to detect dropped conns. */ 1945 #ifdef SO_KEEPALIVE 1946 keepalive = 1; 1947 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1948 (char *)&keepalive, sizeof(int)); 1949 #endif 1950 reply(150, "Opening %s mode data connection for '%s'%s.", 1951 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1952 return (fdopen(pdata, fmode)); 1953 } 1954 if (data >= 0) { 1955 reply(125, "Using existing data connection for '%s'%s.", 1956 name, sizebuf); 1957 usedefault = 1; 1958 return (fdopen(data, fmode)); 1959 } 1960 if (usedefault) 1961 data_dest = his_addr; 1962 usedefault = 1; 1963 retry = conerrno = 0; 1964 do { 1965 file = getdatasock(fmode); 1966 if (file == NULL) { 1967 char hbuf[NI_MAXHOST]; 1968 char pbuf[NI_MAXSERV]; 1969 1970 if (getnameinfo((struct sockaddr *)&data_source.si_su, 1971 data_source.su_len, hbuf, sizeof(hbuf), pbuf, 1972 sizeof(pbuf), NI_NUMERICHOST | NI_NUMERICSERV)) 1973 strlcpy(hbuf, "?", sizeof(hbuf)); 1974 reply(425, "Can't create data socket (%s,%s): %s.", 1975 hbuf, pbuf, strerror(errno)); 1976 return (NULL); 1977 } 1978 data = fileno(file); 1979 conerrno = 0; 1980 if (connect(data, (struct sockaddr *)&data_dest.si_su, 1981 data_dest.su_len) == 0) 1982 break; 1983 conerrno = errno; 1984 (void) fclose(file); 1985 file = NULL; 1986 data = -1; 1987 if (conerrno == EADDRINUSE) { 1988 sleep((unsigned) swaitint); 1989 retry += swaitint; 1990 } else { 1991 break; 1992 } 1993 } while (retry <= swaitmax); 1994 if (conerrno != 0) { 1995 perror_reply(425, "Can't build data connection"); 1996 return (NULL); 1997 } 1998 reply(150, "Opening %s mode data connection for '%s'%s.", 1999 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2000 return (file); 2001 } 2002 2003 void 2004 closedataconn(FILE *fd) 2005 { 2006 2007 if (fd == NULL) 2008 return; 2009 (void)fclose(fd); 2010 data = -1; 2011 if (pdata >= 0) 2012 (void)close(pdata); 2013 pdata = -1; 2014 } 2015 2016 int 2017 write_data(int fd, char *buf, size_t size, off_t *bufrem, 2018 struct timeval *then, int isdata) 2019 { 2020 struct timeval now, td; 2021 ssize_t c; 2022 2023 while (size > 0) { 2024 c = size; 2025 if (curclass.writesize) { 2026 if (curclass.writesize < c) 2027 c = curclass.writesize; 2028 } 2029 if (curclass.rateget) { 2030 if (*bufrem < c) 2031 c = *bufrem; 2032 } 2033 (void) alarm(curclass.timeout); 2034 c = write(fd, buf, c); 2035 if (c <= 0) 2036 return (1); 2037 buf += c; 2038 size -= c; 2039 byte_count += c; 2040 if (isdata) { 2041 total_data_out += c; 2042 total_data += c; 2043 } 2044 total_bytes_out += c; 2045 total_bytes += c; 2046 if (curclass.rateget) { 2047 *bufrem -= c; 2048 if (*bufrem == 0) { 2049 (void)gettimeofday(&now, NULL); 2050 timersub(&now, then, &td); 2051 if (td.tv_sec == 0) { 2052 usleep(1000000 - td.tv_usec); 2053 (void)gettimeofday(then, NULL); 2054 } else 2055 *then = now; 2056 *bufrem = curclass.rateget; 2057 } 2058 } 2059 } 2060 return (0); 2061 } 2062 2063 static enum send_status 2064 send_data_with_read(int filefd, int netfd, const struct stat *st, int isdata) 2065 { 2066 struct timeval then; 2067 off_t bufrem; 2068 size_t readsize; 2069 char *buf; 2070 int c, error; 2071 2072 if (curclass.readsize) 2073 readsize = curclass.readsize; 2074 else 2075 readsize = (size_t)st->st_blksize; 2076 if ((buf = malloc(readsize)) == NULL) { 2077 perror_reply(451, "Local resource failure: malloc"); 2078 return (SS_NO_TRANSFER); 2079 } 2080 2081 if (curclass.rateget) { 2082 bufrem = curclass.rateget; 2083 (void)gettimeofday(&then, NULL); 2084 } 2085 while (1) { 2086 (void) alarm(curclass.timeout); 2087 c = read(filefd, buf, readsize); 2088 if (c == 0) 2089 error = SS_SUCCESS; 2090 else if (c < 0) 2091 error = SS_FILE_ERROR; 2092 else if (write_data(netfd, buf, c, &bufrem, &then, isdata)) 2093 error = SS_DATA_ERROR; 2094 else if (urgflag && handleoobcmd()) 2095 error = SS_ABORTED; 2096 else 2097 continue; 2098 2099 free(buf); 2100 return (error); 2101 } 2102 } 2103 2104 static enum send_status 2105 send_data_with_mmap(int filefd, int netfd, const struct stat *st, int isdata) 2106 { 2107 struct timeval then; 2108 off_t bufrem, filesize, off, origoff; 2109 size_t mapsize, winsize; 2110 int error, sendbufsize, sendlowat; 2111 void *win; 2112 2113 if (curclass.sendbufsize) { 2114 sendbufsize = curclass.sendbufsize; 2115 if (setsockopt(netfd, SOL_SOCKET, SO_SNDBUF, 2116 &sendbufsize, sizeof(int)) == -1) 2117 syslog(LOG_WARNING, "setsockopt(SO_SNDBUF, %d): %m", 2118 sendbufsize); 2119 } 2120 2121 if (curclass.sendlowat) { 2122 sendlowat = curclass.sendlowat; 2123 if (setsockopt(netfd, SOL_SOCKET, SO_SNDLOWAT, 2124 &sendlowat, sizeof(int)) == -1) 2125 syslog(LOG_WARNING, "setsockopt(SO_SNDLOWAT, %d): %m", 2126 sendlowat); 2127 } 2128 2129 winsize = curclass.mmapsize; 2130 filesize = st->st_size; 2131 if (ftpd_debug) 2132 syslog(LOG_INFO, "mmapsize = %ld, writesize = %ld", 2133 (long)winsize, (long)curclass.writesize); 2134 if (winsize == 0) 2135 goto try_read; 2136 2137 off = lseek(filefd, (off_t)0, SEEK_CUR); 2138 if (off == -1) 2139 goto try_read; 2140 2141 origoff = off; 2142 if (curclass.rateget) { 2143 bufrem = curclass.rateget; 2144 (void)gettimeofday(&then, NULL); 2145 } 2146 while (1) { 2147 mapsize = MIN(filesize - off, winsize); 2148 if (mapsize == 0) 2149 break; 2150 win = mmap(NULL, mapsize, PROT_READ, 2151 MAP_FILE|MAP_SHARED, filefd, off); 2152 if (win == MAP_FAILED) { 2153 if (off == origoff) 2154 goto try_read; 2155 return (SS_FILE_ERROR); 2156 } 2157 (void) madvise(win, mapsize, MADV_SEQUENTIAL); 2158 error = write_data(netfd, win, mapsize, &bufrem, &then, 2159 isdata); 2160 (void) madvise(win, mapsize, MADV_DONTNEED); 2161 munmap(win, mapsize); 2162 if (urgflag && handleoobcmd()) 2163 return (SS_ABORTED); 2164 if (error) 2165 return (SS_DATA_ERROR); 2166 off += mapsize; 2167 } 2168 return (SS_SUCCESS); 2169 2170 try_read: 2171 return (send_data_with_read(filefd, netfd, st, isdata)); 2172 } 2173 2174 /* 2175 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 2176 * encapsulation of the data subject to Mode, Structure, and Type. 2177 * 2178 * NB: Form isn't handled. 2179 */ 2180 static int 2181 send_data(FILE *instr, FILE *outstr, const struct stat *st, int isdata) 2182 { 2183 int c, filefd, netfd, rval; 2184 2185 urgflag = 0; 2186 transflag = 1; 2187 rval = -1; 2188 2189 switch (type) { 2190 2191 case TYPE_A: 2192 /* XXXLUKEM: rate limit ascii send (get) */ 2193 (void) alarm(curclass.timeout); 2194 while ((c = getc(instr)) != EOF) { 2195 if (urgflag && handleoobcmd()) 2196 goto cleanup_send_data; 2197 byte_count++; 2198 if (c == '\n') { 2199 if (ferror(outstr)) 2200 goto data_err; 2201 (void) putc('\r', outstr); 2202 if (isdata) { 2203 total_data_out++; 2204 total_data++; 2205 } 2206 total_bytes_out++; 2207 total_bytes++; 2208 } 2209 (void) putc(c, outstr); 2210 if (isdata) { 2211 total_data_out++; 2212 total_data++; 2213 } 2214 total_bytes_out++; 2215 total_bytes++; 2216 if ((byte_count % 4096) == 0) 2217 (void) alarm(curclass.timeout); 2218 } 2219 (void) alarm(0); 2220 fflush(outstr); 2221 if (ferror(instr)) 2222 goto file_err; 2223 if (ferror(outstr)) 2224 goto data_err; 2225 rval = 0; 2226 goto cleanup_send_data; 2227 2228 case TYPE_I: 2229 case TYPE_L: 2230 filefd = fileno(instr); 2231 netfd = fileno(outstr); 2232 switch (send_data_with_mmap(filefd, netfd, st, isdata)) { 2233 2234 case SS_SUCCESS: 2235 break; 2236 2237 case SS_ABORTED: 2238 case SS_NO_TRANSFER: 2239 goto cleanup_send_data; 2240 2241 case SS_FILE_ERROR: 2242 goto file_err; 2243 2244 case SS_DATA_ERROR: 2245 goto data_err; 2246 } 2247 rval = 0; 2248 goto cleanup_send_data; 2249 2250 default: 2251 reply(550, "Unimplemented TYPE %d in send_data", type); 2252 goto cleanup_send_data; 2253 } 2254 2255 data_err: 2256 (void) alarm(0); 2257 perror_reply(426, "Data connection"); 2258 goto cleanup_send_data; 2259 2260 file_err: 2261 (void) alarm(0); 2262 perror_reply(551, "Error on input file"); 2263 goto cleanup_send_data; 2264 2265 cleanup_send_data: 2266 (void) alarm(0); 2267 transflag = 0; 2268 urgflag = 0; 2269 if (isdata) { 2270 total_files_out++; 2271 total_files++; 2272 } 2273 total_xfers_out++; 2274 total_xfers++; 2275 return (rval); 2276 } 2277 2278 /* 2279 * Transfer data from peer to "outstr" using the appropriate encapulation of 2280 * the data subject to Mode, Structure, and Type. 2281 * 2282 * N.B.: Form isn't handled. 2283 */ 2284 static int 2285 receive_data(FILE *instr, FILE *outstr) 2286 { 2287 int c, bare_lfs, netfd, filefd, rval; 2288 off_t byteswritten; 2289 char *buf; 2290 size_t readsize; 2291 struct sigaction sa, sa_saved; 2292 struct stat st; 2293 #ifdef __GNUC__ 2294 (void) &bare_lfs; 2295 #endif 2296 2297 memset(&sa, 0, sizeof(sa)); 2298 sigfillset(&sa.sa_mask); 2299 sa.sa_flags = SA_RESTART; 2300 sa.sa_handler = lostconn; 2301 (void) sigaction(SIGALRM, &sa, &sa_saved); 2302 2303 bare_lfs = 0; 2304 urgflag = 0; 2305 transflag = 1; 2306 rval = -1; 2307 byteswritten = 0; 2308 buf = NULL; 2309 2310 #define FILESIZECHECK(x) \ 2311 do { \ 2312 if (curclass.maxfilesize != -1 && \ 2313 (x) > curclass.maxfilesize) { \ 2314 errno = EFBIG; \ 2315 goto file_err; \ 2316 } \ 2317 } while (0) 2318 2319 switch (type) { 2320 2321 case TYPE_I: 2322 case TYPE_L: 2323 netfd = fileno(instr); 2324 filefd = fileno(outstr); 2325 (void) alarm(curclass.timeout); 2326 if (curclass.readsize) 2327 readsize = curclass.readsize; 2328 else if (fstat(filefd, &st)) 2329 readsize = (size_t)st.st_blksize; 2330 else 2331 readsize = BUFSIZ; 2332 if ((buf = malloc(readsize)) == NULL) { 2333 perror_reply(451, "Local resource failure: malloc"); 2334 goto cleanup_recv_data; 2335 } 2336 if (curclass.rateput) { 2337 while (1) { 2338 int d; 2339 struct timeval then, now, td; 2340 off_t bufrem; 2341 2342 (void)gettimeofday(&then, NULL); 2343 errno = c = d = 0; 2344 for (bufrem = curclass.rateput; bufrem > 0; ) { 2345 if ((c = read(netfd, buf, 2346 MIN(readsize, bufrem))) <= 0) 2347 goto recvdone; 2348 if (urgflag && handleoobcmd()) 2349 goto cleanup_recv_data; 2350 FILESIZECHECK(byte_count + c); 2351 if ((d = write(filefd, buf, c)) != c) 2352 goto file_err; 2353 (void) alarm(curclass.timeout); 2354 bufrem -= c; 2355 byte_count += c; 2356 total_data_in += c; 2357 total_data += c; 2358 total_bytes_in += c; 2359 total_bytes += c; 2360 } 2361 (void)gettimeofday(&now, NULL); 2362 timersub(&now, &then, &td); 2363 if (td.tv_sec == 0) 2364 usleep(1000000 - td.tv_usec); 2365 } 2366 } else { 2367 while ((c = read(netfd, buf, readsize)) > 0) { 2368 if (urgflag && handleoobcmd()) 2369 goto cleanup_recv_data; 2370 FILESIZECHECK(byte_count + c); 2371 if (write(filefd, buf, c) != c) 2372 goto file_err; 2373 (void) alarm(curclass.timeout); 2374 byte_count += c; 2375 total_data_in += c; 2376 total_data += c; 2377 total_bytes_in += c; 2378 total_bytes += c; 2379 } 2380 } 2381 recvdone: 2382 if (c < 0) 2383 goto data_err; 2384 rval = 0; 2385 goto cleanup_recv_data; 2386 2387 case TYPE_E: 2388 reply(553, "TYPE E not implemented."); 2389 goto cleanup_recv_data; 2390 2391 case TYPE_A: 2392 (void) alarm(curclass.timeout); 2393 /* XXXLUKEM: rate limit ascii receive (put) */ 2394 while ((c = getc(instr)) != EOF) { 2395 if (urgflag && handleoobcmd()) 2396 goto cleanup_recv_data; 2397 byte_count++; 2398 total_data_in++; 2399 total_data++; 2400 total_bytes_in++; 2401 total_bytes++; 2402 if ((byte_count % 4096) == 0) 2403 (void) alarm(curclass.timeout); 2404 if (c == '\n') 2405 bare_lfs++; 2406 while (c == '\r') { 2407 if (ferror(outstr)) 2408 goto data_err; 2409 if ((c = getc(instr)) != '\n') { 2410 byte_count++; 2411 total_data_in++; 2412 total_data++; 2413 total_bytes_in++; 2414 total_bytes++; 2415 if ((byte_count % 4096) == 0) 2416 (void) alarm(curclass.timeout); 2417 byteswritten++; 2418 FILESIZECHECK(byteswritten); 2419 (void) putc ('\r', outstr); 2420 if (c == '\0' || c == EOF) 2421 goto contin2; 2422 } 2423 } 2424 byteswritten++; 2425 FILESIZECHECK(byteswritten); 2426 (void) putc(c, outstr); 2427 contin2: ; 2428 } 2429 (void) alarm(0); 2430 fflush(outstr); 2431 if (ferror(instr)) 2432 goto data_err; 2433 if (ferror(outstr)) 2434 goto file_err; 2435 if (bare_lfs) { 2436 reply(-226, 2437 "WARNING! %d bare linefeeds received in ASCII mode", 2438 bare_lfs); 2439 reply(0, "File may not have transferred correctly."); 2440 } 2441 rval = 0; 2442 goto cleanup_recv_data; 2443 2444 default: 2445 reply(550, "Unimplemented TYPE %d in receive_data", type); 2446 goto cleanup_recv_data; 2447 } 2448 #undef FILESIZECHECK 2449 2450 data_err: 2451 (void) alarm(0); 2452 perror_reply(426, "Data Connection"); 2453 goto cleanup_recv_data; 2454 2455 file_err: 2456 (void) alarm(0); 2457 perror_reply(452, "Error writing file"); 2458 goto cleanup_recv_data; 2459 2460 cleanup_recv_data: 2461 (void) alarm(0); 2462 (void) sigaction(SIGALRM, &sa_saved, NULL); 2463 if (buf) 2464 free(buf); 2465 transflag = 0; 2466 urgflag = 0; 2467 total_files_in++; 2468 total_files++; 2469 total_xfers_in++; 2470 total_xfers++; 2471 return (rval); 2472 } 2473 2474 void 2475 statcmd(void) 2476 { 2477 struct sockinet *su = NULL; 2478 static char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV]; 2479 u_char *a, *p; 2480 int ispassive, af; 2481 off_t otbi, otbo, otb; 2482 2483 a = p = (u_char *)NULL; 2484 2485 reply(-211, "%s FTP server status:", hostname); 2486 reply(0, "Version: %s", EMPTYSTR(version) ? "<suppressed>" : version); 2487 hbuf[0] = '\0'; 2488 if (!getnameinfo((struct sockaddr *)&his_addr.si_su, his_addr.su_len, 2489 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) 2490 && strcmp(remotehost, hbuf) != 0) 2491 reply(0, "Connected to %s (%s)", remotehost, hbuf); 2492 else 2493 reply(0, "Connected to %s", remotehost); 2494 2495 if (logged_in) { 2496 if (curclass.type == CLASS_GUEST) 2497 reply(0, "Logged in anonymously"); 2498 else 2499 reply(0, "Logged in as %s%s", pw->pw_name, 2500 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 2501 } else if (askpasswd) 2502 reply(0, "Waiting for password"); 2503 else 2504 reply(0, "Waiting for user name"); 2505 cprintf(stdout, " TYPE: %s", typenames[type]); 2506 if (type == TYPE_A || type == TYPE_E) 2507 cprintf(stdout, ", FORM: %s", formnames[form]); 2508 if (type == TYPE_L) { 2509 #if NBBY == 8 2510 cprintf(stdout, " %d", NBBY); 2511 #else 2512 /* XXX: `bytesize' needs to be defined in this case */ 2513 cprintf(stdout, " %d", bytesize); 2514 #endif 2515 } 2516 cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n", 2517 strunames[stru], modenames[mode]); 2518 ispassive = 0; 2519 if (data != -1) { 2520 reply(0, "Data connection open"); 2521 su = NULL; 2522 } else if (pdata != -1) { 2523 reply(0, "in Passive mode"); 2524 if (curclass.advertise.su_len != 0) 2525 su = &curclass.advertise; 2526 else 2527 su = &pasv_addr; 2528 ispassive = 1; 2529 goto printaddr; 2530 } else if (usedefault == 0) { 2531 su = (struct sockinet *)&data_dest; 2532 2533 if (epsvall) { 2534 reply(0, "EPSV only mode (EPSV ALL)"); 2535 goto epsvonly; 2536 } 2537 printaddr: 2538 /* PASV/PORT */ 2539 if (su->su_family == AF_INET) { 2540 a = (u_char *) &su->su_addr; 2541 p = (u_char *) &su->su_port; 2542 #define UC(b) (((int) b) & 0xff) 2543 reply(0, "%s (%d,%d,%d,%d,%d,%d)", 2544 ispassive ? "PASV" : "PORT" , 2545 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2546 UC(p[0]), UC(p[1])); 2547 } 2548 2549 /* LPSV/LPRT */ 2550 { 2551 int alen, i; 2552 2553 alen = 0; 2554 switch (su->su_family) { 2555 case AF_INET: 2556 a = (u_char *) &su->su_addr; 2557 p = (u_char *) &su->su_port; 2558 alen = sizeof(su->su_addr); 2559 af = 4; 2560 break; 2561 #ifdef INET6 2562 case AF_INET6: 2563 a = (u_char *) &su->su_6addr; 2564 p = (u_char *) &su->su_port; 2565 alen = sizeof(su->su_6addr); 2566 af = 6; 2567 break; 2568 #endif 2569 default: 2570 af = 0; 2571 break; 2572 } 2573 if (af) { 2574 cprintf(stdout, " %s (%d,%d", 2575 ispassive ? "LPSV" : "LPRT", af, alen); 2576 for (i = 0; i < alen; i++) 2577 cprintf(stdout, ",%d", UC(a[i])); 2578 cprintf(stdout, ",%d,%d,%d)\r\n", 2579 2, UC(p[0]), UC(p[1])); 2580 #undef UC 2581 } 2582 } 2583 2584 /* EPRT/EPSV */ 2585 epsvonly: 2586 af = af2epsvproto(su->su_family); 2587 hbuf[0] = '\0'; 2588 if (af > 0) { 2589 struct sockinet tmp; 2590 2591 tmp = *su; 2592 #ifdef INET6 2593 if (tmp.su_family == AF_INET6) 2594 tmp.su_scope_id = 0; 2595 #endif 2596 if (getnameinfo((struct sockaddr *)&tmp.si_su, 2597 tmp.su_len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), 2598 NI_NUMERICHOST | NI_NUMERICSERV) == 0) 2599 reply(0, "%s (|%d|%s|%s|)", 2600 ispassive ? "EPSV" : "EPRT", 2601 af, hbuf, sbuf); 2602 } 2603 } else 2604 reply(0, "No data connection"); 2605 2606 if (logged_in) { 2607 reply(0, 2608 "Data sent: " LLF " byte%s in " LLF " file%s", 2609 (LLT)total_data_out, PLURAL(total_data_out), 2610 (LLT)total_files_out, PLURAL(total_files_out)); 2611 reply(0, 2612 "Data received: " LLF " byte%s in " LLF " file%s", 2613 (LLT)total_data_in, PLURAL(total_data_in), 2614 (LLT)total_files_in, PLURAL(total_files_in)); 2615 reply(0, 2616 "Total data: " LLF " byte%s in " LLF " file%s", 2617 (LLT)total_data, PLURAL(total_data), 2618 (LLT)total_files, PLURAL(total_files)); 2619 } 2620 otbi = total_bytes_in; 2621 otbo = total_bytes_out; 2622 otb = total_bytes; 2623 reply(0, "Traffic sent: " LLF " byte%s in " LLF " transfer%s", 2624 (LLT)otbo, PLURAL(otbo), 2625 (LLT)total_xfers_out, PLURAL(total_xfers_out)); 2626 reply(0, "Traffic received: " LLF " byte%s in " LLF " transfer%s", 2627 (LLT)otbi, PLURAL(otbi), 2628 (LLT)total_xfers_in, PLURAL(total_xfers_in)); 2629 reply(0, "Total traffic: " LLF " byte%s in " LLF " transfer%s", 2630 (LLT)otb, PLURAL(otb), 2631 (LLT)total_xfers, PLURAL(total_xfers)); 2632 2633 if (logged_in && !CURCLASS_FLAGS_ISSET(private)) { 2634 struct ftpconv *cp; 2635 2636 reply(0, "%s", ""); 2637 reply(0, "Class: %s, type: %s", 2638 curclass.classname, CURCLASSTYPE); 2639 reply(0, "Check PORT/LPRT commands: %sabled", 2640 CURCLASS_FLAGS_ISSET(checkportcmd) ? "en" : "dis"); 2641 if (! EMPTYSTR(curclass.display)) 2642 reply(0, "Display file: %s", curclass.display); 2643 if (! EMPTYSTR(curclass.notify)) 2644 reply(0, "Notify fileglob: %s", curclass.notify); 2645 reply(0, "Idle timeout: " LLF ", maximum timeout: " LLF, 2646 (LLT)curclass.timeout, (LLT)curclass.maxtimeout); 2647 reply(0, "Current connections: %d", connections); 2648 if (curclass.limit == -1) 2649 reply(0, "Maximum connections: unlimited"); 2650 else 2651 reply(0, "Maximum connections: " LLF, 2652 (LLT)curclass.limit); 2653 if (curclass.limitfile) 2654 reply(0, "Connection limit exceeded message file: %s", 2655 conffilename(curclass.limitfile)); 2656 if (! EMPTYSTR(curclass.chroot)) 2657 reply(0, "Chroot format: %s", curclass.chroot); 2658 reply(0, "Deny bad ftpusers(5) quickly: %sabled", 2659 CURCLASS_FLAGS_ISSET(denyquick) ? "en" : "dis"); 2660 if (! EMPTYSTR(curclass.homedir)) 2661 reply(0, "Homedir format: %s", curclass.homedir); 2662 if (curclass.maxfilesize == -1) 2663 reply(0, "Maximum file size: unlimited"); 2664 else 2665 reply(0, "Maximum file size: " LLF, 2666 (LLT)curclass.maxfilesize); 2667 if (! EMPTYSTR(curclass.motd)) 2668 reply(0, "MotD file: %s", conffilename(curclass.motd)); 2669 reply(0, 2670 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 2671 CURCLASS_FLAGS_ISSET(modify) ? "en" : "dis"); 2672 reply(0, "Upload commands (APPE, STOR, STOU): %sabled", 2673 CURCLASS_FLAGS_ISSET(upload) ? "en" : "dis"); 2674 reply(0, "Sanitize file names: %sabled", 2675 CURCLASS_FLAGS_ISSET(sanenames) ? "en" : "dis"); 2676 reply(0, "PASV/LPSV/EPSV connections: %sabled", 2677 CURCLASS_FLAGS_ISSET(passive) ? "en" : "dis"); 2678 if (curclass.advertise.su_len != 0) { 2679 char buf[50]; /* big enough for IPv6 address */ 2680 const char *bp; 2681 2682 bp = inet_ntop(curclass.advertise.su_family, 2683 (void *)&curclass.advertise.su_addr, 2684 buf, sizeof(buf)); 2685 if (bp != NULL) 2686 reply(0, "PASV advertise address: %s", bp); 2687 } 2688 if (curclass.portmin && curclass.portmax) 2689 reply(0, "PASV port range: " LLF " - " LLF, 2690 (LLT)curclass.portmin, (LLT)curclass.portmax); 2691 if (curclass.rateget) 2692 reply(0, "Rate get limit: " LLF " bytes/sec", 2693 (LLT)curclass.rateget); 2694 else 2695 reply(0, "Rate get limit: disabled"); 2696 if (curclass.rateput) 2697 reply(0, "Rate put limit: " LLF " bytes/sec", 2698 (LLT)curclass.rateput); 2699 else 2700 reply(0, "Rate put limit: disabled"); 2701 if (curclass.mmapsize) 2702 reply(0, "Mmap size: " LLF, (LLT)curclass.mmapsize); 2703 else 2704 reply(0, "Mmap size: disabled"); 2705 if (curclass.readsize) 2706 reply(0, "Read size: " LLF, (LLT)curclass.readsize); 2707 else 2708 reply(0, "Read size: default"); 2709 if (curclass.writesize) 2710 reply(0, "Write size: " LLF, (LLT)curclass.writesize); 2711 else 2712 reply(0, "Write size: default"); 2713 if (curclass.recvbufsize) 2714 reply(0, "Receive buffer size: " LLF, 2715 (LLT)curclass.recvbufsize); 2716 else 2717 reply(0, "Receive buffer size: default"); 2718 if (curclass.sendbufsize) 2719 reply(0, "Send buffer size: " LLF, 2720 (LLT)curclass.sendbufsize); 2721 else 2722 reply(0, "Send buffer size: default"); 2723 if (curclass.sendlowat) 2724 reply(0, "Send low water mark: " LLF, 2725 (LLT)curclass.sendlowat); 2726 else 2727 reply(0, "Send low water mark: default"); 2728 reply(0, "Umask: %.04o", curclass.umask); 2729 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 2730 if (cp->suffix == NULL || cp->types == NULL || 2731 cp->command == NULL) 2732 continue; 2733 reply(0, "Conversion: %s [%s] disable: %s, command: %s", 2734 cp->suffix, cp->types, cp->disable, cp->command); 2735 } 2736 } 2737 2738 reply(211, "End of status"); 2739 } 2740 2741 void 2742 fatal(const char *s) 2743 { 2744 2745 reply(451, "Error in server: %s\n", s); 2746 reply(221, "Closing connection due to server error."); 2747 dologout(0); 2748 /* NOTREACHED */ 2749 } 2750 2751 /* 2752 * reply() -- 2753 * depending on the value of n, display fmt with a trailing CRLF and 2754 * prefix of: 2755 * n < -1 prefix the message with abs(n) + "-" (initial line) 2756 * n == 0 prefix the message with 4 spaces (middle lines) 2757 * n > 0 prefix the message with n + " " (final line) 2758 */ 2759 void 2760 reply(int n, const char *fmt, ...) 2761 { 2762 char msg[MAXPATHLEN * 2 + 100]; 2763 size_t b; 2764 va_list ap; 2765 2766 b = 0; 2767 if (n == 0) 2768 b = snprintf(msg, sizeof(msg), " "); 2769 else if (n < 0) 2770 b = snprintf(msg, sizeof(msg), "%d-", -n); 2771 else 2772 b = snprintf(msg, sizeof(msg), "%d ", n); 2773 va_start(ap, fmt); 2774 vsnprintf(msg + b, sizeof(msg) - b, fmt, ap); 2775 va_end(ap); 2776 cprintf(stdout, "%s\r\n", msg); 2777 (void)fflush(stdout); 2778 if (ftpd_debug) 2779 syslog(LOG_DEBUG, "<--- %s", msg); 2780 } 2781 2782 static void 2783 logremotehost(struct sockinet *who) 2784 { 2785 2786 if (getnameinfo((struct sockaddr *)&who->si_su, 2787 who->su_len, remotehost, sizeof(remotehost), NULL, 0, 0)) 2788 strlcpy(remotehost, "?", sizeof(remotehost)); 2789 2790 #if HAVE_SETPROCTITLE 2791 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2792 setproctitle("%s", proctitle); 2793 #endif /* HAVE_SETPROCTITLE */ 2794 if (logging) 2795 syslog(LOG_INFO, "connection from %s to %s", 2796 remotehost, hostname); 2797 } 2798 2799 /* 2800 * Record logout in wtmp file and exit with supplied status. 2801 * NOTE: because this is called from signal handlers it cannot 2802 * use stdio (or call other functions that use stdio). 2803 */ 2804 void 2805 dologout(int status) 2806 { 2807 /* 2808 * Prevent reception of SIGURG from resulting in a resumption 2809 * back to the main program loop. 2810 */ 2811 transflag = 0; 2812 logout_utmp(); 2813 if (logged_in) { 2814 #ifdef KERBEROS 2815 if (!notickets && krbtkfile_env) 2816 unlink(krbtkfile_env); 2817 #endif 2818 } 2819 /* beware of flushing buffers after a SIGPIPE */ 2820 if (xferlogfd != -1) 2821 close(xferlogfd); 2822 _exit(status); 2823 } 2824 2825 void 2826 abor(void) 2827 { 2828 2829 if (!transflag) 2830 return; 2831 tmpline[0] = '\0'; 2832 is_oob = 0; 2833 reply(426, "Transfer aborted. Data connection closed."); 2834 reply(226, "Abort successful"); 2835 transflag = 0; /* flag that the transfer has aborted */ 2836 } 2837 2838 void 2839 statxfer(void) 2840 { 2841 2842 if (!transflag) 2843 return; 2844 tmpline[0] = '\0'; 2845 is_oob = 0; 2846 if (file_size != (off_t) -1) 2847 reply(213, 2848 "Status: " LLF " of " LLF " byte%s transferred", 2849 (LLT)byte_count, (LLT)file_size, 2850 PLURAL(byte_count)); 2851 else 2852 reply(213, "Status: " LLF " byte%s transferred", 2853 (LLT)byte_count, PLURAL(byte_count)); 2854 } 2855 2856 /* 2857 * Call when urgflag != 0 to handle Out Of Band commands. 2858 * Returns non zero if the OOB command aborted the transfer 2859 * by setting transflag to 0. (c.f., "ABOR"). 2860 */ 2861 static int 2862 handleoobcmd() 2863 { 2864 char *cp; 2865 2866 if (!urgflag) 2867 return (0); 2868 urgflag = 0; 2869 /* only process if transfer occurring */ 2870 if (!transflag) 2871 return (0); 2872 cp = tmpline; 2873 if (getline(cp, sizeof(tmpline), stdin) == NULL) { 2874 reply(221, "You could at least say goodbye."); 2875 dologout(0); 2876 } 2877 /* 2878 * Manually parse OOB commands, because we can't 2879 * recursively call the yacc parser... 2880 */ 2881 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2882 abor(); 2883 } else if (strcasecmp(cp, "STAT\r\n") == 0) { 2884 statxfer(); 2885 } else { 2886 /* XXX: error with "500 unknown command" ? */ 2887 } 2888 return (transflag == 0); 2889 } 2890 2891 static int 2892 bind_pasv_addr(void) 2893 { 2894 static int passiveport; 2895 int port, len; 2896 2897 len = pasv_addr.su_len; 2898 if (curclass.portmin == 0 && curclass.portmax == 0) { 2899 pasv_addr.su_port = 0; 2900 return (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len)); 2901 } 2902 2903 if (passiveport == 0) { 2904 srand(getpid()); 2905 passiveport = rand() % (curclass.portmax - curclass.portmin) 2906 + curclass.portmin; 2907 } 2908 2909 port = passiveport; 2910 while (1) { 2911 port++; 2912 if (port > curclass.portmax) 2913 port = curclass.portmin; 2914 else if (port == passiveport) { 2915 errno = EAGAIN; 2916 return (-1); 2917 } 2918 pasv_addr.su_port = htons(port); 2919 if (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len) == 0) 2920 break; 2921 if (errno != EADDRINUSE) 2922 return (-1); 2923 } 2924 passiveport = port; 2925 return (0); 2926 } 2927 2928 /* 2929 * Note: a response of 425 is not mentioned as a possible response to 2930 * the PASV command in RFC959. However, it has been blessed as 2931 * a legitimate response by Jon Postel in a telephone conversation 2932 * with Rick Adams on 25 Jan 89. 2933 */ 2934 void 2935 passive(void) 2936 { 2937 socklen_t len, recvbufsize; 2938 char *p, *a; 2939 2940 if (pdata >= 0) 2941 close(pdata); 2942 pdata = socket(AF_INET, SOCK_STREAM, 0); 2943 if (pdata < 0 || !logged_in) { 2944 perror_reply(425, "Can't open passive connection"); 2945 return; 2946 } 2947 pasv_addr = ctrl_addr; 2948 2949 if (bind_pasv_addr() < 0) 2950 goto pasv_error; 2951 len = pasv_addr.su_len; 2952 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 2953 goto pasv_error; 2954 pasv_addr.su_len = len; 2955 if (curclass.recvbufsize) { 2956 recvbufsize = curclass.recvbufsize; 2957 if (setsockopt(pdata, SOL_SOCKET, SO_RCVBUF, &recvbufsize, 2958 sizeof(int)) == -1) 2959 syslog(LOG_WARNING, "setsockopt(SO_RCVBUF, %d): %m", 2960 recvbufsize); 2961 } 2962 if (listen(pdata, 1) < 0) 2963 goto pasv_error; 2964 if (curclass.advertise.su_len != 0) 2965 a = (char *) &curclass.advertise.su_addr; 2966 else 2967 a = (char *) &pasv_addr.su_addr; 2968 p = (char *) &pasv_addr.su_port; 2969 2970 #define UC(b) (((int) b) & 0xff) 2971 2972 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2973 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2974 return; 2975 2976 pasv_error: 2977 (void) close(pdata); 2978 pdata = -1; 2979 perror_reply(425, "Can't open passive connection"); 2980 return; 2981 } 2982 2983 /* 2984 * convert protocol identifier to/from AF 2985 */ 2986 int 2987 lpsvproto2af(int proto) 2988 { 2989 2990 switch (proto) { 2991 case 4: 2992 return AF_INET; 2993 #ifdef INET6 2994 case 6: 2995 return AF_INET6; 2996 #endif 2997 default: 2998 return -1; 2999 } 3000 } 3001 3002 int 3003 af2lpsvproto(int af) 3004 { 3005 3006 switch (af) { 3007 case AF_INET: 3008 return 4; 3009 #ifdef INET6 3010 case AF_INET6: 3011 return 6; 3012 #endif 3013 default: 3014 return -1; 3015 } 3016 } 3017 3018 int 3019 epsvproto2af(int proto) 3020 { 3021 3022 switch (proto) { 3023 case 1: 3024 return AF_INET; 3025 #ifdef INET6 3026 case 2: 3027 return AF_INET6; 3028 #endif 3029 default: 3030 return -1; 3031 } 3032 } 3033 3034 int 3035 af2epsvproto(int af) 3036 { 3037 3038 switch (af) { 3039 case AF_INET: 3040 return 1; 3041 #ifdef INET6 3042 case AF_INET6: 3043 return 2; 3044 #endif 3045 default: 3046 return -1; 3047 } 3048 } 3049 3050 /* 3051 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 3052 * 229 Entering Extended Passive Mode (|||port|) 3053 */ 3054 void 3055 long_passive(char *cmd, int pf) 3056 { 3057 socklen_t len; 3058 char *p, *a; 3059 3060 if (!logged_in) { 3061 syslog(LOG_NOTICE, "long passive but not logged in"); 3062 reply(503, "Login with USER first."); 3063 return; 3064 } 3065 3066 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 3067 /* 3068 * XXX: only EPRT/EPSV ready clients will understand this 3069 */ 3070 if (strcmp(cmd, "EPSV") != 0) 3071 reply(501, "Network protocol mismatch"); /*XXX*/ 3072 else 3073 epsv_protounsupp("Network protocol mismatch"); 3074 3075 return; 3076 } 3077 3078 if (pdata >= 0) 3079 close(pdata); 3080 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 3081 if (pdata < 0) { 3082 perror_reply(425, "Can't open passive connection"); 3083 return; 3084 } 3085 pasv_addr = ctrl_addr; 3086 if (bind_pasv_addr() < 0) 3087 goto pasv_error; 3088 len = pasv_addr.su_len; 3089 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 3090 goto pasv_error; 3091 pasv_addr.su_len = len; 3092 if (listen(pdata, 1) < 0) 3093 goto pasv_error; 3094 p = (char *) &pasv_addr.su_port; 3095 3096 #define UC(b) (((int) b) & 0xff) 3097 3098 if (strcmp(cmd, "LPSV") == 0) { 3099 struct sockinet *advert; 3100 3101 if (curclass.advertise.su_len != 0) 3102 advert = &curclass.advertise; 3103 else 3104 advert = &pasv_addr; 3105 switch (advert->su_family) { 3106 case AF_INET: 3107 a = (char *) &advert->su_addr; 3108 reply(228, 3109 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3110 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3111 2, UC(p[0]), UC(p[1])); 3112 return; 3113 #ifdef INET6 3114 case AF_INET6: 3115 a = (char *) &advert->su_6addr; 3116 reply(228, 3117 "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)", 3118 6, 16, 3119 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3120 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3121 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3122 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3123 2, UC(p[0]), UC(p[1])); 3124 return; 3125 #endif 3126 } 3127 #undef UC 3128 } else if (strcmp(cmd, "EPSV") == 0) { 3129 switch (pasv_addr.su_family) { 3130 case AF_INET: 3131 #ifdef INET6 3132 case AF_INET6: 3133 #endif 3134 reply(229, "Entering Extended Passive Mode (|||%d|)", 3135 ntohs(pasv_addr.su_port)); 3136 return; 3137 } 3138 } else { 3139 /* more proper error code? */ 3140 } 3141 3142 pasv_error: 3143 (void) close(pdata); 3144 pdata = -1; 3145 perror_reply(425, "Can't open passive connection"); 3146 return; 3147 } 3148 3149 int 3150 extended_port(const char *arg) 3151 { 3152 char *tmp = NULL; 3153 char *result[3]; 3154 char *p, *q; 3155 char delim; 3156 struct addrinfo hints; 3157 struct addrinfo *res = NULL; 3158 int i; 3159 unsigned long proto; 3160 3161 tmp = ftpd_strdup(arg); 3162 p = tmp; 3163 delim = p[0]; 3164 p++; 3165 memset(result, 0, sizeof(result)); 3166 for (i = 0; i < 3; i++) { 3167 q = strchr(p, delim); 3168 if (!q || *q != delim) 3169 goto parsefail; 3170 *q++ = '\0'; 3171 result[i] = p; 3172 p = q; 3173 } 3174 3175 /* some more sanity checks */ 3176 errno = 0; 3177 p = NULL; 3178 (void)strtoul(result[2], &p, 10); 3179 if (errno || !*result[2] || *p) 3180 goto parsefail; 3181 errno = 0; 3182 p = NULL; 3183 proto = strtoul(result[0], &p, 10); 3184 if (errno || !*result[0] || *p) 3185 goto protounsupp; 3186 3187 memset(&hints, 0, sizeof(hints)); 3188 hints.ai_family = epsvproto2af((int)proto); 3189 if (hints.ai_family < 0) 3190 goto protounsupp; 3191 hints.ai_socktype = SOCK_STREAM; 3192 hints.ai_flags = AI_NUMERICHOST; 3193 if (getaddrinfo(result[1], result[2], &hints, &res)) 3194 goto parsefail; 3195 if (res->ai_next) 3196 goto parsefail; 3197 if (sizeof(data_dest) < res->ai_addrlen) 3198 goto parsefail; 3199 memcpy(&data_dest.si_su, res->ai_addr, res->ai_addrlen); 3200 data_dest.su_len = res->ai_addrlen; 3201 #ifdef INET6 3202 if (his_addr.su_family == AF_INET6 && 3203 data_dest.su_family == AF_INET6) { 3204 /* XXX: more sanity checks! */ 3205 data_dest.su_scope_id = his_addr.su_scope_id; 3206 } 3207 #endif 3208 3209 if (tmp != NULL) 3210 free(tmp); 3211 if (res) 3212 freeaddrinfo(res); 3213 return 0; 3214 3215 parsefail: 3216 reply(500, "Invalid argument, rejected."); 3217 usedefault = 1; 3218 if (tmp != NULL) 3219 free(tmp); 3220 if (res) 3221 freeaddrinfo(res); 3222 return -1; 3223 3224 protounsupp: 3225 epsv_protounsupp("Protocol not supported"); 3226 usedefault = 1; 3227 if (tmp != NULL) 3228 free(tmp); 3229 return -1; 3230 } 3231 3232 /* 3233 * 522 Protocol not supported (proto,...) 3234 * as we assume address family for control and data connections are the same, 3235 * we do not return the list of address families we support - instead, we 3236 * return the address family of the control connection. 3237 */ 3238 void 3239 epsv_protounsupp(const char *message) 3240 { 3241 int proto; 3242 3243 proto = af2epsvproto(ctrl_addr.su_family); 3244 if (proto < 0) 3245 reply(501, "%s", message); /* XXX */ 3246 else 3247 reply(522, "%s, use (%d)", message, proto); 3248 } 3249 3250 /* 3251 * Generate unique name for file with basename "local". 3252 * The file named "local" is already known to exist. 3253 * Generates failure reply on error. 3254 * 3255 * XXX: this function should under go changes similar to 3256 * the mktemp(3)/mkstemp(3) changes. 3257 */ 3258 static char * 3259 gunique(const char *local) 3260 { 3261 static char new[MAXPATHLEN]; 3262 struct stat st; 3263 char *cp; 3264 int count; 3265 3266 cp = strrchr(local, '/'); 3267 if (cp) 3268 *cp = '\0'; 3269 if (stat(cp ? local : ".", &st) < 0) { 3270 perror_reply(553, cp ? local : "."); 3271 return (NULL); 3272 } 3273 if (cp) 3274 *cp = '/'; 3275 for (count = 1; count < 100; count++) { 3276 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 3277 if (stat(new, &st) < 0) 3278 return (new); 3279 } 3280 reply(452, "Unique file name cannot be created."); 3281 return (NULL); 3282 } 3283 3284 /* 3285 * Format and send reply containing system error number. 3286 */ 3287 void 3288 perror_reply(int code, const char *string) 3289 { 3290 int save_errno; 3291 3292 save_errno = errno; 3293 reply(code, "%s: %s.", string, strerror(errno)); 3294 errno = save_errno; 3295 } 3296 3297 static char *onefile[] = { 3298 "", 3299 0 3300 }; 3301 3302 void 3303 send_file_list(const char *whichf) 3304 { 3305 struct stat st; 3306 DIR *dirp = NULL; 3307 struct dirent *dir; 3308 FILE *dout = NULL; 3309 char **dirlist, *dirname, *p; 3310 char *notglob = NULL; 3311 int simple = 0; 3312 int freeglob = 0; 3313 glob_t gl; 3314 3315 #ifdef __GNUC__ 3316 (void) &dout; 3317 (void) &dirlist; 3318 (void) &simple; 3319 (void) &freeglob; 3320 #endif 3321 urgflag = 0; 3322 3323 p = NULL; 3324 if (strpbrk(whichf, "~{[*?") != NULL) { 3325 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE|GLOB_LIMIT; 3326 3327 memset(&gl, 0, sizeof(gl)); 3328 freeglob = 1; 3329 if (glob(whichf, flags, 0, &gl)) { 3330 reply(450, "Not found"); 3331 goto cleanup_send_file_list; 3332 } else if (gl.gl_pathc == 0) { 3333 errno = ENOENT; 3334 perror_reply(450, whichf); 3335 goto cleanup_send_file_list; 3336 } 3337 dirlist = gl.gl_pathv; 3338 } else { 3339 notglob = ftpd_strdup(whichf); 3340 onefile[0] = notglob; 3341 dirlist = onefile; 3342 simple = 1; 3343 } 3344 /* XXX: } for vi sm */ 3345 3346 while ((dirname = *dirlist++) != NULL) { 3347 int trailingslash = 0; 3348 3349 if (stat(dirname, &st) < 0) { 3350 /* 3351 * If user typed "ls -l", etc, and the client 3352 * used NLST, do what the user meant. 3353 */ 3354 /* XXX: nuke this support? */ 3355 if (dirname[0] == '-' && *dirlist == NULL && 3356 transflag == 0) { 3357 char *argv[] = { INTERNAL_LS, "", NULL }; 3358 3359 argv[1] = dirname; 3360 retrieve(argv, dirname); 3361 goto cleanup_send_file_list; 3362 } 3363 perror_reply(450, whichf); 3364 goto cleanup_send_file_list; 3365 } 3366 3367 if (S_ISREG(st.st_mode)) { 3368 /* 3369 * XXXRFC: 3370 * should we follow RFC959 and not work 3371 * for non directories? 3372 */ 3373 if (dout == NULL) { 3374 dout = dataconn("file list", (off_t)-1, "w"); 3375 if (dout == NULL) 3376 goto cleanup_send_file_list; 3377 transflag = 1; 3378 } 3379 cprintf(dout, "%s%s\n", dirname, 3380 type == TYPE_A ? "\r" : ""); 3381 continue; 3382 } else if (!S_ISDIR(st.st_mode)) 3383 continue; 3384 3385 if (dirname[strlen(dirname) - 1] == '/') 3386 trailingslash++; 3387 3388 if ((dirp = opendir(dirname)) == NULL) 3389 continue; 3390 3391 while ((dir = readdir(dirp)) != NULL) { 3392 char nbuf[MAXPATHLEN]; 3393 3394 if (urgflag && handleoobcmd()) 3395 goto cleanup_send_file_list; 3396 3397 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 3398 continue; 3399 3400 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 3401 trailingslash ? "" : "/", dir->d_name); 3402 3403 /* 3404 * We have to do a stat to ensure it's 3405 * not a directory or special file. 3406 */ 3407 /* 3408 * XXXRFC: 3409 * should we follow RFC959 and filter out 3410 * non files ? lukem - NO!, or not until 3411 * our ftp client uses MLS{T,D} for completion. 3412 */ 3413 if (simple || (stat(nbuf, &st) == 0 && 3414 S_ISREG(st.st_mode))) { 3415 if (dout == NULL) { 3416 dout = dataconn("file list", (off_t)-1, 3417 "w"); 3418 if (dout == NULL) 3419 goto cleanup_send_file_list; 3420 transflag = 1; 3421 } 3422 p = nbuf; 3423 if (nbuf[0] == '.' && nbuf[1] == '/') 3424 p = &nbuf[2]; 3425 cprintf(dout, "%s%s\n", p, 3426 type == TYPE_A ? "\r" : ""); 3427 } 3428 } 3429 (void) closedir(dirp); 3430 } 3431 3432 if (dout == NULL) 3433 reply(450, "No files found."); 3434 else if (ferror(dout) != 0) 3435 perror_reply(451, "Data connection"); 3436 else 3437 reply(226, "Transfer complete."); 3438 3439 cleanup_send_file_list: 3440 closedataconn(dout); 3441 transflag = 0; 3442 urgflag = 0; 3443 total_xfers++; 3444 total_xfers_out++; 3445 if (notglob) 3446 free(notglob); 3447 if (freeglob) 3448 globfree(&gl); 3449 } 3450 3451 char * 3452 conffilename(const char *s) 3453 { 3454 static char filename[MAXPATHLEN]; 3455 3456 if (*s == '/') 3457 strlcpy(filename, s, sizeof(filename)); 3458 else 3459 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 3460 return (filename); 3461 } 3462 3463 /* 3464 * logxfer -- 3465 * if logging > 1, then based on the arguments, syslog a message: 3466 * if bytes != -1 "<command> <file1> = <bytes> bytes" 3467 * else if file2 != NULL "<command> <file1> <file2>" 3468 * else "<command> <file1>" 3469 * if elapsed != NULL, append "in xxx.yyy seconds" 3470 * if error != NULL, append ": " + error 3471 * 3472 * if doxferlog != 0, bytes != -1, and command is "get", "put", 3473 * or "append", syslog and/or write a wu-ftpd style xferlog entry 3474 */ 3475 void 3476 logxfer(const char *command, off_t bytes, const char *file1, const char *file2, 3477 const struct timeval *elapsed, const char *error) 3478 { 3479 char buf[MAXPATHLEN * 2 + 100]; 3480 char realfile1[MAXPATHLEN], realfile2[MAXPATHLEN]; 3481 const char *r1, *r2; 3482 char direction; 3483 size_t len; 3484 time_t now; 3485 3486 if (logging <=1 && !doxferlog) 3487 return; 3488 3489 r1 = r2 = NULL; 3490 if ((r1 = realpath(file1, realfile1)) == NULL) 3491 r1 = file1; 3492 if (file2 != NULL) 3493 if ((r2 = realpath(file2, realfile2)) == NULL) 3494 r2 = file2; 3495 3496 /* 3497 * syslog command 3498 */ 3499 if (logging > 1) { 3500 len = snprintf(buf, sizeof(buf), "%s %s", command, r1); 3501 if (bytes != (off_t)-1) 3502 len += snprintf(buf + len, sizeof(buf) - len, 3503 " = " LLF " byte%s", (LLT) bytes, PLURAL(bytes)); 3504 else if (r2 != NULL) 3505 len += snprintf(buf + len, sizeof(buf) - len, 3506 " %s", r2); 3507 if (elapsed != NULL) 3508 len += snprintf(buf + len, sizeof(buf) - len, 3509 " in %ld.%.03d seconds", elapsed->tv_sec, 3510 (int)(elapsed->tv_usec / 1000)); 3511 if (error != NULL) 3512 len += snprintf(buf + len, sizeof(buf) - len, 3513 ": %s", error); 3514 syslog(LOG_INFO, "%s", buf); 3515 } 3516 3517 /* 3518 * syslog wu-ftpd style log entry, prefixed with "xferlog: " 3519 */ 3520 if (!doxferlog || bytes == -1) 3521 return; 3522 3523 if (strcmp(command, "get") == 0) 3524 direction = 'o'; 3525 else if (strcmp(command, "put") == 0 || strcmp(command, "append") == 0) 3526 direction = 'i'; 3527 else 3528 return; 3529 3530 time(&now); 3531 len = snprintf(buf, sizeof(buf), 3532 "%.24s %ld %s " LLF " %s %c %s %c %c %s FTP 0 * %c\n", 3533 3534 /* 3535 * XXX: wu-ftpd puts ' (send)' or ' (recv)' in the syslog message, and removes 3536 * the full date. This may be problematic for accurate log parsing, 3537 * given that syslog messages don't contain the full date. 3538 */ 3539 ctime(&now), 3540 elapsed == NULL ? 0 : elapsed->tv_sec + (elapsed->tv_usec > 0), 3541 remotehost, 3542 (LLT) bytes, 3543 r1, 3544 type == TYPE_A ? 'a' : 'b', 3545 "_", /* XXX: take conversions into account? */ 3546 direction, 3547 3548 curclass.type == CLASS_GUEST ? 'a' : 3549 curclass.type == CLASS_CHROOT ? 'g' : 3550 curclass.type == CLASS_REAL ? 'r' : '?', 3551 3552 curclass.type == CLASS_GUEST ? pw->pw_passwd : pw->pw_name, 3553 error != NULL ? 'i' : 'c' 3554 ); 3555 3556 if ((doxferlog & 2) && xferlogfd != -1) 3557 write(xferlogfd, buf, len); 3558 if ((doxferlog & 1)) { 3559 buf[len-1] = '\n'; /* strip \n from syslog message */ 3560 syslog(LOG_INFO, "xferlog: %s", buf); 3561 } 3562 } 3563 3564 /* 3565 * Log the resource usage. 3566 * 3567 * XXX: more resource usage to logging? 3568 */ 3569 void 3570 logrusage(const struct rusage *rusage_before, 3571 const struct rusage *rusage_after) 3572 { 3573 struct timeval usrtime, systime; 3574 3575 if (logging <= 1) 3576 return; 3577 3578 timersub(&rusage_after->ru_utime, &rusage_before->ru_utime, &usrtime); 3579 timersub(&rusage_after->ru_stime, &rusage_before->ru_stime, &systime); 3580 syslog(LOG_INFO, "%ld.%.03du %ld.%.03ds %ld+%ldio %ldpf+%ldw", 3581 usrtime.tv_sec, (int)(usrtime.tv_usec / 1000), 3582 systime.tv_sec, (int)(systime.tv_usec / 1000), 3583 rusage_after->ru_inblock - rusage_before->ru_inblock, 3584 rusage_after->ru_oublock - rusage_before->ru_oublock, 3585 rusage_after->ru_majflt - rusage_before->ru_majflt, 3586 rusage_after->ru_nswap - rusage_before->ru_nswap); 3587 } 3588 3589 /* 3590 * Determine if `password' is valid for user given in `pw'. 3591 * Returns 2 if password expired, 1 if otherwise failed, 0 if ok 3592 */ 3593 int 3594 checkpassword(const struct passwd *pwent, const char *password) 3595 { 3596 char *orig, *new; 3597 time_t change, expire, now; 3598 3599 change = expire = 0; 3600 if (pwent == NULL) 3601 return 1; 3602 3603 time(&now); 3604 orig = pwent->pw_passwd; /* save existing password */ 3605 expire = pwent->pw_expire; 3606 change = (pwent->pw_change == _PASSWORD_CHGNOW)? now : pwent->pw_change; 3607 3608 if (orig[0] == '\0') /* don't allow empty passwords */ 3609 return 1; 3610 3611 new = crypt(password, orig); /* encrypt given password */ 3612 if (strcmp(new, orig) != 0) /* compare */ 3613 return 1; 3614 3615 if ((expire && now >= expire) || (change && now >= change)) 3616 return 2; /* check if expired */ 3617 3618 return 0; /* OK! */ 3619 } 3620 3621 char * 3622 ftpd_strdup(const char *s) 3623 { 3624 char *new = strdup(s); 3625 3626 if (new == NULL) 3627 fatal("Local resource failure: malloc"); 3628 /* NOTREACHED */ 3629 return (new); 3630 } 3631 3632 /* 3633 * As per fprintf(), but increment total_bytes and total_bytes_out, 3634 * by the appropriate amount. 3635 */ 3636 void 3637 cprintf(FILE *fd, const char *fmt, ...) 3638 { 3639 off_t b; 3640 va_list ap; 3641 3642 va_start(ap, fmt); 3643 b = vfprintf(fd, fmt, ap); 3644 va_end(ap); 3645 total_bytes += b; 3646 total_bytes_out += b; 3647 } 3648 3649 #ifdef USE_PAM 3650 /* 3651 * the following code is stolen from imap-uw PAM authentication module and 3652 * login.c 3653 */ 3654 #define COPY_STRING(s) (s ? strdup(s) : NULL) 3655 3656 struct cred_t { 3657 const char *uname; /* user name */ 3658 const char *pass; /* password */ 3659 }; 3660 typedef struct cred_t cred_t; 3661 3662 static int 3663 auth_conv(int num_msg, const struct pam_message **msg, 3664 struct pam_response **resp, void *appdata) 3665 { 3666 int i; 3667 cred_t *cred = (cred_t *) appdata; 3668 struct pam_response *myreply; 3669 3670 myreply = calloc(num_msg, sizeof *myreply); 3671 if (myreply == NULL) 3672 return PAM_BUF_ERR; 3673 3674 for (i = 0; i < num_msg; i++) { 3675 switch (msg[i]->msg_style) { 3676 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 3677 myreply[i].resp_retcode = PAM_SUCCESS; 3678 myreply[i].resp = COPY_STRING(cred->uname); 3679 /* PAM frees resp. */ 3680 break; 3681 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 3682 myreply[i].resp_retcode = PAM_SUCCESS; 3683 myreply[i].resp = COPY_STRING(cred->pass); 3684 /* PAM frees resp. */ 3685 break; 3686 case PAM_TEXT_INFO: 3687 case PAM_ERROR_MSG: 3688 myreply[i].resp_retcode = PAM_SUCCESS; 3689 myreply[i].resp = NULL; 3690 break; 3691 default: /* unknown message style */ 3692 free(myreply); 3693 return PAM_CONV_ERR; 3694 } 3695 } 3696 3697 *resp = myreply; 3698 return PAM_SUCCESS; 3699 } 3700 3701 /* 3702 * Attempt to authenticate the user using PAM. Returns 0 if the user is 3703 * authenticated, or 1 if not authenticated. If some sort of PAM system 3704 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 3705 * function returns -1. This can be used as an indication that we should 3706 * fall back to a different authentication mechanism. 3707 */ 3708 static int 3709 auth_pam(struct passwd **ppw, const char *pwstr) 3710 { 3711 const char *tmpl_user; 3712 const void *item; 3713 int rval; 3714 int e; 3715 cred_t auth_cred = { (*ppw)->pw_name, pwstr }; 3716 struct pam_conv conv = { &auth_conv, &auth_cred }; 3717 3718 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 3719 if (e != PAM_SUCCESS) { 3720 /* 3721 * In OpenPAM, it's OK to pass NULL to pam_strerror() 3722 * if context creation has failed in the first place. 3723 */ 3724 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 3725 return -1; 3726 } 3727 3728 e = pam_set_item(pamh, PAM_RHOST, remotehost); 3729 if (e != PAM_SUCCESS) { 3730 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 3731 pam_strerror(pamh, e)); 3732 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 3733 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 3734 } 3735 pamh = NULL; 3736 return -1; 3737 } 3738 3739 e = pam_authenticate(pamh, 0); 3740 switch (e) { 3741 case PAM_SUCCESS: 3742 /* 3743 * With PAM we support the concept of a "template" 3744 * user. The user enters a login name which is 3745 * authenticated by PAM, usually via a remote service 3746 * such as RADIUS or TACACS+. If authentication 3747 * succeeds, a different but related "template" name 3748 * is used for setting the credentials, shell, and 3749 * home directory. The name the user enters need only 3750 * exist on the remote authentication server, but the 3751 * template name must be present in the local password 3752 * database. 3753 * 3754 * This is supported by two various mechanisms in the 3755 * individual modules. However, from the application's 3756 * point of view, the template user is always passed 3757 * back as a changed value of the PAM_USER item. 3758 */ 3759 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 3760 PAM_SUCCESS) { 3761 tmpl_user = (const char *) item; 3762 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 3763 *ppw = sgetpwnam(tmpl_user); 3764 } else 3765 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 3766 pam_strerror(pamh, e)); 3767 rval = 0; 3768 break; 3769 3770 case PAM_AUTH_ERR: 3771 case PAM_USER_UNKNOWN: 3772 case PAM_MAXTRIES: 3773 rval = 1; 3774 break; 3775 3776 default: 3777 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 3778 rval = -1; 3779 break; 3780 } 3781 3782 if (rval == 0) { 3783 e = pam_acct_mgmt(pamh, 0); 3784 if (e != PAM_SUCCESS) { 3785 syslog(LOG_ERR, "pam_acct_mgmt: %s", 3786 pam_strerror(pamh, e)); 3787 rval = 1; 3788 } 3789 } 3790 3791 if (rval != 0) { 3792 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 3793 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 3794 } 3795 pamh = NULL; 3796 } 3797 return rval; 3798 } 3799 3800 #endif /* USE_PAM */ 3801
Indexes created Fri Sep 26 08:10:20 GMT 2025