ftpd.c revision 1.164.2.1.4.4
1 /* $NetBSD: ftpd.c,v 1.164.2.1.4.4 2008/09/18 19:16:54 bouyer 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 1.164.2.1.4.4 2008/09/18 19:16:54 bouyer 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 <signal.h> 144 #include <stdarg.h> 145 #include <stdio.h> 146 #include <stdlib.h> 147 #include <string.h> 148 #include <syslog.h> 149 #include <time.h> 150 #include <tzfile.h> 151 #include <unistd.h> 152 #include <util.h> 153 #ifdef SUPPORT_UTMP 154 #include <utmp.h> 155 #endif 156 #ifdef SUPPORT_UTMPX 157 #include <utmpx.h> 158 #endif 159 #ifdef SKEY 160 #include <skey.h> 161 #endif 162 #ifdef KERBEROS5 163 #include <com_err.h> 164 #include <krb5/krb5.h> 165 #endif 166 167 #ifdef LOGIN_CAP 168 #include <login_cap.h> 169 #endif 170 171 #ifdef USE_PAM 172 #include <security/pam_appl.h> 173 #endif 174 175 #define GLOBAL 176 #include "extern.h" 177 #include "pathnames.h" 178 #include "version.h" 179 180 volatile sig_atomic_t transflag; 181 volatile sig_atomic_t urgflag; 182 183 int data; 184 int sflag; 185 int stru; /* avoid C keyword */ 186 int mode; 187 int dataport; /* use specific data port */ 188 int dopidfile; /* maintain pid file */ 189 int doutmp; /* update utmp file */ 190 int dowtmp; /* update wtmp file */ 191 int doxferlog; /* syslog/write wu-ftpd style xferlog entries */ 192 int xferlogfd; /* fd to write wu-ftpd xferlog entries to */ 193 int dropprivs; /* if privileges should or have been dropped */ 194 int mapped; /* IPv4 connection on AF_INET6 socket */ 195 off_t file_size; 196 off_t byte_count; 197 static char ttyline[20]; 198 199 #ifdef USE_PAM 200 static int auth_pam(struct passwd **, const char *); 201 pam_handle_t *pamh = NULL; 202 #endif 203 204 #ifdef SUPPORT_UTMP 205 static struct utmp utmp; /* for utmp */ 206 #endif 207 #ifdef SUPPORT_UTMPX 208 static struct utmpx utmpx; /* for utmpx */ 209 #endif 210 211 static const char *anondir = NULL; 212 static const char *confdir = _DEFAULT_CONFDIR; 213 214 static char *curname; /* current USER name */ 215 static size_t curname_len; /* length of curname (include NUL) */ 216 217 #if defined(KERBEROS) || defined(KERBEROS5) 218 int has_ccache = 0; 219 int notickets = 1; 220 char *krbtkfile_env = NULL; 221 char *tty = ttyline; 222 int login_krb5_forwardable_tgt = 0; 223 #endif 224 225 int epsvall = 0; 226 227 /* 228 * Timeout intervals for retrying connections 229 * to hosts that don't accept PORT cmds. This 230 * is a kludge, but given the problems with TCP... 231 */ 232 #define SWAITMAX 90 /* wait at most 90 seconds */ 233 #define SWAITINT 5 /* interval between retries */ 234 235 int swaitmax = SWAITMAX; 236 int swaitint = SWAITINT; 237 238 enum send_status { 239 SS_SUCCESS, 240 SS_ABORTED, /* transfer aborted */ 241 SS_NO_TRANSFER, /* no transfer made yet */ 242 SS_FILE_ERROR, /* file read error */ 243 SS_DATA_ERROR /* data send error */ 244 }; 245 246 static int bind_pasv_addr(void); 247 static int checkuser(const char *, const char *, int, int, char **); 248 static int checkaccess(const char *); 249 static int checkpassword(const struct passwd *, const char *); 250 static void end_login(void); 251 static FILE *getdatasock(const char *); 252 static char *gunique(const char *); 253 static void login_utmp(const char *, const char *, const char *, 254 struct sockinet *); 255 static void logremotehost(struct sockinet *); 256 static void lostconn(int); 257 static void toolong(int); 258 static void sigquit(int); 259 static void sigurg(int); 260 static int handleoobcmd(void); 261 static int receive_data(FILE *, FILE *); 262 static int send_data(FILE *, FILE *, const struct stat *, int); 263 static struct passwd *sgetpwnam(const char *); 264 static int write_data(int, char *, size_t, off_t *, struct timeval *, 265 int); 266 static enum send_status 267 send_data_with_read(int, int, const struct stat *, int); 268 static enum send_status 269 send_data_with_mmap(int, int, const struct stat *, int); 270 static void logrusage(const struct rusage *, const struct rusage *); 271 static void logout_utmp(void); 272 273 int main(int, char *[]); 274 275 #if defined(KERBEROS) 276 int klogin(struct passwd *, char *, char *, char *); 277 void kdestroy(void); 278 #endif 279 #if defined(KERBEROS5) 280 int k5login(struct passwd *, char *, char *, char *); 281 void k5destroy(void); 282 #endif 283 284 int 285 main(int argc, char *argv[]) 286 { 287 int addrlen, ch, on = 1, tos, keepalive; 288 #ifdef KERBEROS5 289 krb5_error_code kerror; 290 #endif 291 char *p; 292 const char *xferlogname = NULL; 293 long l; 294 struct sigaction sa; 295 296 connections = 1; 297 debug = 0; 298 logging = 0; 299 pdata = -1; 300 sflag = 0; 301 dataport = 0; 302 dopidfile = 1; /* default: DO use a pid file to count users */ 303 doutmp = 0; /* default: Do NOT log to utmp */ 304 dowtmp = 1; /* default: DO log to wtmp */ 305 doxferlog = 0; /* default: Do NOT syslog xferlog */ 306 xferlogfd = -1; /* default: Do NOT write xferlog file */ 307 dropprivs = 0; 308 mapped = 0; 309 usedefault = 1; 310 emailaddr = NULL; 311 hostname[0] = '\0'; 312 homedir[0] = '\0'; 313 gidcount = 0; 314 is_oob = 0; 315 version = FTPD_VERSION; 316 317 /* 318 * LOG_NDELAY sets up the logging connection immediately, 319 * necessary for anonymous ftp's that chroot and can't do it later. 320 */ 321 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 322 323 while ((ch = getopt(argc, argv, "a:c:C:de:h:HlL:P:qQrst:T:uUvV:wWX")) 324 != -1) { 325 switch (ch) { 326 case 'a': 327 anondir = optarg; 328 break; 329 330 case 'c': 331 confdir = optarg; 332 break; 333 334 case 'C': 335 pw = sgetpwnam(optarg); 336 exit(checkaccess(optarg) ? 0 : 1); 337 /* NOTREACHED */ 338 339 case 'd': 340 case 'v': /* deprecated */ 341 debug = 1; 342 break; 343 344 case 'e': 345 emailaddr = optarg; 346 break; 347 348 case 'h': 349 strlcpy(hostname, optarg, sizeof(hostname)); 350 break; 351 352 case 'H': 353 if (gethostname(hostname, sizeof(hostname)) == -1) 354 hostname[0] = '\0'; 355 hostname[sizeof(hostname) - 1] = '\0'; 356 break; 357 358 case 'l': 359 logging++; /* > 1 == extra logging */ 360 break; 361 362 case 'L': 363 xferlogname = optarg; 364 break; 365 366 case 'P': 367 errno = 0; 368 p = NULL; 369 l = strtol(optarg, &p, 10); 370 if (errno || *optarg == '\0' || *p != '\0' || 371 l < IPPORT_RESERVED || 372 l > IPPORT_ANONMAX) { 373 syslog(LOG_WARNING, "Invalid dataport %s", 374 optarg); 375 dataport = 0; 376 } 377 dataport = (int)l; 378 break; 379 380 case 'q': 381 dopidfile = 1; 382 break; 383 384 case 'Q': 385 dopidfile = 0; 386 break; 387 388 case 'r': 389 dropprivs = 1; 390 break; 391 392 case 's': 393 sflag = 1; 394 break; 395 396 case 't': 397 case 'T': 398 syslog(LOG_WARNING, 399 "-%c has been deprecated in favour of ftpd.conf", 400 ch); 401 break; 402 403 case 'u': 404 doutmp = 1; 405 break; 406 407 case 'U': 408 doutmp = 0; 409 break; 410 411 case 'V': 412 if (EMPTYSTR(optarg) || strcmp(optarg, "-") == 0) 413 version = NULL; 414 else 415 version = xstrdup(optarg); 416 break; 417 418 case 'w': 419 dowtmp = 1; 420 break; 421 422 case 'W': 423 dowtmp = 0; 424 break; 425 426 case 'X': 427 doxferlog |= 1; 428 break; 429 430 default: 431 if (optopt == 'a' || optopt == 'C') 432 exit(1); 433 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 434 break; 435 } 436 } 437 if (EMPTYSTR(confdir)) 438 confdir = _DEFAULT_CONFDIR; 439 440 errno = 0; 441 l = sysconf(_SC_LOGIN_NAME_MAX); 442 if (l == -1 && errno != 0) { 443 syslog(LOG_ERR, "sysconf _SC_LOGIN_NAME_MAX: %m"); 444 exit(1); 445 } else if (l <= 0) { 446 syslog(LOG_WARNING, "using conservative LOGIN_NAME_MAX value"); 447 curname_len = _POSIX_LOGIN_NAME_MAX; 448 } else 449 curname_len = (size_t)l; 450 curname = malloc(curname_len); 451 if (curname == NULL) { 452 syslog(LOG_ERR, "malloc: %m"); 453 exit(1); 454 } 455 curname[0] = '\0'; 456 457 memset((char *)&his_addr, 0, sizeof(his_addr)); 458 addrlen = sizeof(his_addr.si_su); 459 if (getpeername(0, (struct sockaddr *)&his_addr.si_su, &addrlen) < 0) { 460 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 461 exit(1); 462 } 463 his_addr.su_len = addrlen; 464 memset((char *)&ctrl_addr, 0, sizeof(ctrl_addr)); 465 addrlen = sizeof(ctrl_addr.si_su); 466 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 467 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 468 exit(1); 469 } 470 ctrl_addr.su_len = addrlen; 471 #ifdef INET6 472 if (his_addr.su_family == AF_INET6 473 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_6addr)) { 474 #if 1 475 /* 476 * IPv4 control connection arrived to AF_INET6 socket. 477 * I hate to do this, but this is the easiest solution. 478 * 479 * The assumption is untrue on SIIT environment. 480 */ 481 struct sockinet tmp_addr; 482 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 483 484 tmp_addr = his_addr; 485 memset(&his_addr, 0, sizeof(his_addr)); 486 his_addr.su_family = AF_INET; 487 his_addr.su_len = sizeof(his_addr.si_su.su_sin); 488 memcpy(&his_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 489 sizeof(his_addr.su_addr)); 490 his_addr.su_port = tmp_addr.su_port; 491 492 tmp_addr = ctrl_addr; 493 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 494 ctrl_addr.su_family = AF_INET; 495 ctrl_addr.su_len = sizeof(ctrl_addr.si_su.su_sin); 496 memcpy(&ctrl_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 497 sizeof(ctrl_addr.su_addr)); 498 ctrl_addr.su_port = tmp_addr.su_port; 499 #else 500 while (fgets(line, sizeof(line), fd) != NULL) { 501 if ((cp = strchr(line, '\n')) != NULL) 502 *cp = '\0'; 503 reply(-530, "%s", line); 504 } 505 (void) fflush(stdout); 506 (void) fclose(fd); 507 reply(530, 508 "Connection from IPv4 mapped address is not supported."); 509 exit(0); 510 #endif 511 512 mapped = 1; 513 } else 514 #endif /* INET6 */ 515 mapped = 0; 516 #ifdef IP_TOS 517 if (!mapped && his_addr.su_family == AF_INET) { 518 tos = IPTOS_LOWDELAY; 519 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 520 sizeof(int)) < 0) 521 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 522 } 523 #endif 524 /* if the hostname hasn't been given, attempt to determine it */ 525 if (hostname[0] == '\0') { 526 if (getnameinfo((struct sockaddr *)&ctrl_addr.si_su, 527 ctrl_addr.su_len, hostname, sizeof(hostname), NULL, 0, 0) 528 != 0) 529 (void)gethostname(hostname, sizeof(hostname)); 530 hostname[sizeof(hostname) - 1] = '\0'; 531 } 532 533 /* set this here so klogin can use it... */ 534 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 535 536 (void) freopen(_PATH_DEVNULL, "w", stderr); 537 538 memset(&sa, 0, sizeof(sa)); 539 sa.sa_handler = SIG_DFL; 540 sa.sa_flags = SA_RESTART; 541 sigemptyset(&sa.sa_mask); 542 (void) sigaction(SIGCHLD, &sa, NULL); 543 544 sa.sa_handler = sigquit; 545 sa.sa_flags = SA_RESTART; 546 sigfillset(&sa.sa_mask); /* block all sigs in these handlers */ 547 (void) sigaction(SIGHUP, &sa, NULL); 548 (void) sigaction(SIGINT, &sa, NULL); 549 (void) sigaction(SIGQUIT, &sa, NULL); 550 (void) sigaction(SIGTERM, &sa, NULL); 551 sa.sa_handler = lostconn; 552 (void) sigaction(SIGPIPE, &sa, NULL); 553 sa.sa_handler = toolong; 554 (void) sigaction(SIGALRM, &sa, NULL); 555 sa.sa_handler = sigurg; 556 (void) sigaction(SIGURG, &sa, NULL); 557 558 /* Try to handle urgent data inline */ 559 #ifdef SO_OOBINLINE 560 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 561 syslog(LOG_WARNING, "setsockopt: %m"); 562 #endif 563 /* Set keepalives on the socket to detect dropped connections. */ 564 #ifdef SO_KEEPALIVE 565 keepalive = 1; 566 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 567 sizeof(int)) < 0) 568 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 569 #endif 570 571 #ifdef F_SETOWN 572 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 573 syslog(LOG_WARNING, "fcntl F_SETOWN: %m"); 574 #endif 575 logremotehost(&his_addr); 576 /* 577 * Set up default state 578 */ 579 data = -1; 580 type = TYPE_A; 581 form = FORM_N; 582 stru = STRU_F; 583 mode = MODE_S; 584 tmpline[0] = '\0'; 585 hasyyerrored = 0; 586 587 #ifdef KERBEROS5 588 kerror = krb5_init_context(&kcontext); 589 if (kerror) { 590 syslog(LOG_ERR, "%s when initializing Kerberos context", 591 error_message(kerror)); 592 exit(0); 593 } 594 #endif /* KERBEROS5 */ 595 596 init_curclass(); 597 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 598 curclass.type = CLASS_REAL; 599 600 /* If logins are disabled, print out the message. */ 601 if (display_file(_PATH_NOLOGIN, 530)) { 602 reply(530, "System not available."); 603 exit(0); 604 } 605 (void)display_file(conffilename(_NAME_FTPWELCOME), 220); 606 /* reply(220,) must follow */ 607 if (EMPTYSTR(version)) 608 reply(220, "%s FTP server ready.", hostname); 609 else 610 reply(220, "%s FTP server (%s) ready.", hostname, version); 611 612 if (xferlogname != NULL) { 613 xferlogfd = open(xferlogname, O_WRONLY | O_APPEND | O_CREAT, 614 0660); 615 if (xferlogfd == -1) 616 syslog(LOG_WARNING, "open xferlog `%s': %m", 617 xferlogname); 618 else 619 doxferlog |= 2; 620 } 621 622 ftp_loop(); 623 /* NOTREACHED */ 624 } 625 626 static void 627 lostconn(int signo) 628 { 629 630 if (debug) 631 syslog(LOG_DEBUG, "lost connection"); 632 dologout(1); 633 } 634 635 static void 636 toolong(int signo) 637 { 638 639 /* XXXSIGRACE */ 640 reply(421, 641 "Timeout (" LLF " seconds): closing control connection.", 642 (LLT)curclass.timeout); 643 if (logging) 644 syslog(LOG_INFO, "User %s timed out after " LLF " seconds", 645 (pw ? pw->pw_name : "unknown"), (LLT)curclass.timeout); 646 dologout(1); 647 } 648 649 static void 650 sigquit(int signo) 651 { 652 653 if (debug) 654 syslog(LOG_DEBUG, "got signal %d", signo); 655 dologout(1); 656 } 657 658 static void 659 sigurg(int signo) 660 { 661 662 urgflag = 1; 663 } 664 665 666 /* 667 * Save the result of a getpwnam. Used for USER command, since 668 * the data returned must not be clobbered by any other command 669 * (e.g., globbing). 670 */ 671 static struct passwd * 672 sgetpwnam(const char *name) 673 { 674 static struct passwd save; 675 struct passwd *p; 676 677 if ((p = getpwnam(name)) == NULL) 678 return (p); 679 if (save.pw_name) { 680 free((char *)save.pw_name); 681 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 682 free((char *)save.pw_passwd); 683 free((char *)save.pw_gecos); 684 free((char *)save.pw_dir); 685 free((char *)save.pw_shell); 686 } 687 save = *p; 688 save.pw_name = xstrdup(p->pw_name); 689 save.pw_passwd = xstrdup(p->pw_passwd); 690 save.pw_gecos = xstrdup(p->pw_gecos); 691 save.pw_dir = xstrdup(p->pw_dir); 692 save.pw_shell = xstrdup(p->pw_shell); 693 return (&save); 694 } 695 696 static int login_attempts; /* number of failed login attempts */ 697 static int askpasswd; /* had USER command, ask for PASSwd */ 698 static int permitted; /* USER permitted */ 699 700 /* 701 * USER command. 702 * Sets global passwd pointer pw if named account exists and is acceptable; 703 * sets askpasswd if a PASS command is expected. If logged in previously, 704 * need to reset state. If name is "ftp" or "anonymous", the name is not in 705 * _NAME_FTPUSERS, and ftp account exists, set guest and pw, then just return. 706 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 707 * requesting login privileges. Disallow anyone who does not have a standard 708 * shell as returned by getusershell(). Disallow anyone mentioned in the file 709 * _NAME_FTPUSERS to allow people such as root and uucp to be avoided. 710 */ 711 void 712 user(const char *name) 713 { 714 char *class; 715 #ifdef LOGIN_CAP 716 login_cap_t *lc = NULL; 717 #endif 718 719 class = NULL; 720 if (logged_in) { 721 switch (curclass.type) { 722 case CLASS_GUEST: 723 reply(530, "Can't change user from guest login."); 724 return; 725 case CLASS_CHROOT: 726 reply(530, "Can't change user from chroot user."); 727 return; 728 case CLASS_REAL: 729 if (dropprivs) { 730 reply(530, "Can't change user."); 731 return; 732 } 733 end_login(); 734 break; 735 default: 736 abort(); 737 } 738 } 739 740 #if defined(KERBEROS) 741 kdestroy(); 742 #endif 743 #if defined(KERBEROS5) 744 k5destroy(); 745 #endif 746 747 curclass.type = CLASS_REAL; 748 askpasswd = 0; 749 permitted = 0; 750 751 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 752 /* need `pw' setup for checkaccess() and checkuser () */ 753 if ((pw = sgetpwnam("ftp")) == NULL) 754 reply(530, "User %s unknown.", name); 755 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 756 reply(530, "User %s access denied.", name); 757 else { 758 curclass.type = CLASS_GUEST; 759 askpasswd = 1; 760 reply(331, 761 "Guest login ok, type your name as password."); 762 } 763 if (!askpasswd) { 764 if (logging) 765 syslog(LOG_NOTICE, 766 "ANONYMOUS FTP LOGIN REFUSED FROM %s", 767 remotehost); 768 end_login(); 769 goto cleanup_user; 770 } 771 name = "ftp"; 772 } else 773 pw = sgetpwnam(name); 774 775 strlcpy(curname, name, curname_len); 776 777 /* check user in /etc/ftpusers, and setup class */ 778 permitted = checkuser(_NAME_FTPUSERS, curname, 1, 0, &class); 779 780 /* check user in /etc/ftpchroot */ 781 lc = login_getpwclass(pw); 782 if (checkuser(_NAME_FTPCHROOT, curname, 0, 0, NULL) 783 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 784 || login_getcapbool(lc, "ftp-chroot", 0) 785 #endif 786 ) { 787 if (curclass.type == CLASS_GUEST) { 788 syslog(LOG_NOTICE, 789 "Can't change guest user to chroot class; remove entry in %s", 790 _NAME_FTPCHROOT); 791 exit(1); 792 } 793 curclass.type = CLASS_CHROOT; 794 } 795 /* determine default class */ 796 if (class == NULL) { 797 switch (curclass.type) { 798 case CLASS_GUEST: 799 class = xstrdup("guest"); 800 break; 801 case CLASS_CHROOT: 802 class = xstrdup("chroot"); 803 break; 804 case CLASS_REAL: 805 class = xstrdup("real"); 806 break; 807 default: 808 syslog(LOG_ERR, "unknown curclass.type %d; aborting", 809 curclass.type); 810 abort(); 811 } 812 } 813 /* parse ftpd.conf, setting up various parameters */ 814 parse_conf(class); 815 /* if not guest user, check for valid shell */ 816 if (pw == NULL) 817 permitted = 0; 818 else { 819 const char *cp, *shell; 820 821 if ((shell = pw->pw_shell) == NULL || *shell == 0) 822 shell = _PATH_BSHELL; 823 while ((cp = getusershell()) != NULL) 824 if (strcmp(cp, shell) == 0) 825 break; 826 endusershell(); 827 if (cp == NULL && curclass.type != CLASS_GUEST) 828 permitted = 0; 829 } 830 831 /* deny quickly (after USER not PASS) if requested */ 832 if (CURCLASS_FLAGS_ISSET(denyquick) && !permitted) { 833 reply(530, "User %s may not use FTP.", curname); 834 if (logging) 835 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 836 remotehost, curname); 837 end_login(); 838 goto cleanup_user; 839 } 840 841 /* if haven't asked yet (i.e, not anon), ask now */ 842 if (!askpasswd) { 843 askpasswd = 1; 844 #ifdef SKEY 845 if (skey_haskey(curname) == 0) { 846 const char *myskey; 847 848 myskey = skey_keyinfo(curname); 849 reply(331, "Password [ %s ] required for %s.", 850 myskey ? myskey : "error getting challenge", 851 curname); 852 } else 853 #endif 854 reply(331, "Password required for %s.", curname); 855 } 856 857 cleanup_user: 858 #ifdef LOGIN_CAP 859 login_close(lc); 860 #endif 861 /* 862 * Delay before reading passwd after first failed 863 * attempt to slow down passwd-guessing programs. 864 */ 865 if (login_attempts) 866 sleep((unsigned) login_attempts); 867 868 if (class) 869 free(class); 870 } 871 872 /* 873 * Determine whether something is to happen (allow access, chroot) 874 * for a user. Each line is a shell-style glob followed by 875 * `yes' or `no'. 876 * 877 * For backward compatibility, `allow' and `deny' are synonymns 878 * for `yes' and `no', respectively. 879 * 880 * Each glob is matched against the username in turn, and the first 881 * match found is used. If no match is found, the result is the 882 * argument `def'. If a match is found but without and explicit 883 * `yes'/`no', the result is the opposite of def. 884 * 885 * If the file doesn't exist at all, the result is the argument 886 * `nofile' 887 * 888 * Any line starting with `#' is considered a comment and ignored. 889 * 890 * Returns 0 if the user is denied, or 1 if they are allowed. 891 * 892 * NOTE: needs struct passwd *pw setup before use. 893 */ 894 static int 895 checkuser(const char *fname, const char *name, int def, int nofile, 896 char **retclass) 897 { 898 FILE *fd; 899 int retval; 900 char *word, *perm, *class, *buf, *p; 901 size_t len, line; 902 903 retval = def; 904 if (retclass != NULL) 905 *retclass = NULL; 906 if ((fd = fopen(conffilename(fname), "r")) == NULL) 907 return nofile; 908 909 line = 0; 910 for (; 911 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 912 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 913 free(buf), buf = NULL) { 914 word = perm = class = NULL; 915 p = buf; 916 if (len < 1) 917 continue; 918 if (p[len - 1] == '\n') 919 p[--len] = '\0'; 920 if (EMPTYSTR(p)) 921 continue; 922 923 NEXTWORD(p, word); 924 NEXTWORD(p, perm); 925 NEXTWORD(p, class); 926 if (EMPTYSTR(word)) 927 continue; 928 if (!EMPTYSTR(class)) { 929 if (strcasecmp(class, "all") == 0 || 930 strcasecmp(class, "none") == 0) { 931 syslog(LOG_WARNING, 932 "%s line %d: illegal user-defined class `%s' - skipping entry", 933 fname, (int)line, class); 934 continue; 935 } 936 } 937 938 /* have a host specifier */ 939 if ((p = strchr(word, '@')) != NULL) { 940 unsigned long net, mask, addr; 941 int bits; 942 943 *p++ = '\0'; 944 /* check against network or CIDR */ 945 if (isdigit((unsigned char)*p) && 946 (bits = inet_net_pton(AF_INET, p, 947 &net, sizeof(net))) != -1) { 948 net = ntohl(net); 949 mask = 0xffffffffU << (32 - bits); 950 addr = ntohl(his_addr.su_addr.s_addr); 951 if ((addr & mask) != net) 952 continue; 953 954 /* check against hostname glob */ 955 } else if (fnmatch(p, remotehost, FNM_CASEFOLD) != 0) 956 continue; 957 } 958 959 /* have a group specifier */ 960 if ((p = strchr(word, ':')) != NULL) { 961 gid_t *groups, *ng; 962 int gsize, i, found; 963 964 if (pw == NULL) 965 continue; /* no match for unknown user */ 966 *p++ = '\0'; 967 groups = NULL; 968 gsize = 16; 969 do { 970 ng = realloc(groups, gsize * sizeof(gid_t)); 971 if (ng == NULL) 972 fatal( 973 "Local resource failure: realloc"); 974 groups = ng; 975 } while (getgrouplist(pw->pw_name, pw->pw_gid, 976 groups, &gsize) == -1); 977 found = 0; 978 for (i = 0; i < gsize; i++) { 979 struct group *g; 980 981 if ((g = getgrgid(groups[i])) == NULL) 982 continue; 983 if (fnmatch(p, g->gr_name, 0) == 0) { 984 found = 1; 985 break; 986 } 987 } 988 free(groups); 989 if (!found) 990 continue; 991 } 992 993 /* check against username glob */ 994 if (fnmatch(word, name, 0) != 0) 995 continue; 996 997 if (perm != NULL && 998 ((strcasecmp(perm, "allow") == 0) || 999 (strcasecmp(perm, "yes") == 0))) 1000 retval = 1; 1001 else if (perm != NULL && 1002 ((strcasecmp(perm, "deny") == 0) || 1003 (strcasecmp(perm, "no") == 0))) 1004 retval = 0; 1005 else 1006 retval = !def; 1007 if (!EMPTYSTR(class) && retclass != NULL) 1008 *retclass = xstrdup(class); 1009 free(buf); 1010 break; 1011 } 1012 (void) fclose(fd); 1013 return (retval); 1014 } 1015 1016 /* 1017 * Check if user is allowed by /etc/ftpusers 1018 * returns 1 for yes, 0 for no 1019 * 1020 * NOTE: needs struct passwd *pw setup (for checkuser()) 1021 */ 1022 static int 1023 checkaccess(const char *name) 1024 { 1025 1026 return (checkuser(_NAME_FTPUSERS, name, 1, 0, NULL)); 1027 } 1028 1029 static void 1030 login_utmp(const char *line, const char *name, const char *host, 1031 struct sockinet *haddr) 1032 { 1033 #if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP) 1034 struct timeval tv; 1035 (void)gettimeofday(&tv, NULL); 1036 #endif 1037 #ifdef SUPPORT_UTMPX 1038 if (doutmp) { 1039 (void)memset(&utmpx, 0, sizeof(utmpx)); 1040 utmpx.ut_tv = tv; 1041 utmpx.ut_pid = getpid(); 1042 utmpx.ut_id[0] = 'f'; 1043 utmpx.ut_id[1] = 't'; 1044 utmpx.ut_id[2] = 'p'; 1045 utmpx.ut_id[3] = '*'; 1046 utmpx.ut_type = USER_PROCESS; 1047 (void)strncpy(utmpx.ut_name, name, sizeof(utmpx.ut_name)); 1048 (void)strncpy(utmpx.ut_line, line, sizeof(utmpx.ut_line)); 1049 (void)strncpy(utmpx.ut_host, host, sizeof(utmpx.ut_host)); 1050 (void)memcpy(&utmpx.ut_ss, &haddr->si_su, haddr->su_len); 1051 ftpd_loginx(&utmpx); 1052 } 1053 if (dowtmp) 1054 ftpd_logwtmpx(line, name, host, haddr, 0, USER_PROCESS); 1055 #endif 1056 #ifdef SUPPORT_UTMP 1057 if (doutmp) { 1058 (void)memset(&utmp, 0, sizeof(utmp)); 1059 (void)time(&utmp.ut_time); 1060 (void)strncpy(utmp.ut_name, name, sizeof(utmp.ut_name)); 1061 (void)strncpy(utmp.ut_line, line, sizeof(utmp.ut_line)); 1062 (void)strncpy(utmp.ut_host, host, sizeof(utmp.ut_host)); 1063 ftpd_login(&utmp); 1064 } 1065 if (dowtmp) 1066 ftpd_logwtmp(line, name, host); 1067 #endif 1068 } 1069 1070 static void 1071 logout_utmp(void) 1072 { 1073 int okwtmp = dowtmp; 1074 if (logged_in) { 1075 if (doutmp) { 1076 #ifdef SUPPORT_UTMPX 1077 okwtmp = logoutx(ttyline, 0, DEAD_PROCESS) & dowtmp; 1078 #endif 1079 #ifdef SUPPORT_UTMP 1080 okwtmp = ftpd_logout(ttyline) & dowtmp; 1081 #endif 1082 } 1083 if (okwtmp) { 1084 #ifdef SUPPORT_UTMPX 1085 ftpd_logwtmpx(ttyline, "", "", NULL, 0, 1086 DEAD_PROCESS); 1087 #endif 1088 #ifdef SUPPORT_UTMP 1089 ftpd_logwtmp(ttyline, "", ""); 1090 #endif 1091 } 1092 } 1093 } 1094 1095 /* 1096 * Terminate login as previous user (if any), resetting state; 1097 * used when USER command is given or login fails. 1098 */ 1099 static void 1100 end_login(void) 1101 { 1102 #ifdef USE_PAM 1103 int e; 1104 #endif 1105 logout_utmp(); 1106 show_chdir_messages(-1); /* flush chdir cache */ 1107 if (pw != NULL && pw->pw_passwd != NULL) 1108 memset(pw->pw_passwd, 0, strlen(pw->pw_passwd)); 1109 pw = NULL; 1110 logged_in = 0; 1111 askpasswd = 0; 1112 permitted = 0; 1113 quietmessages = 0; 1114 gidcount = 0; 1115 curclass.type = CLASS_REAL; 1116 (void) seteuid((uid_t)0); 1117 #ifdef LOGIN_CAP 1118 setusercontext(NULL, getpwuid(0), 0, 1119 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1120 #endif 1121 #ifdef USE_PAM 1122 if (pamh) { 1123 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1124 syslog(LOG_ERR, "pam_setcred: %s", 1125 pam_strerror(pamh, e)); 1126 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1127 syslog(LOG_ERR, "pam_close_session: %s", 1128 pam_strerror(pamh, e)); 1129 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1130 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1131 pamh = NULL; 1132 } 1133 #endif 1134 } 1135 1136 void 1137 pass(const char *passwd) 1138 { 1139 int rval; 1140 char root[MAXPATHLEN]; 1141 #ifdef LOGIN_CAP 1142 login_cap_t *lc = NULL; 1143 #endif 1144 #ifdef USE_PAM 1145 int e; 1146 #endif 1147 if (logged_in || askpasswd == 0) { 1148 reply(503, "Login with USER first."); 1149 return; 1150 } 1151 askpasswd = 0; 1152 if (curclass.type != CLASS_GUEST) { 1153 /* "ftp" is the only account allowed with no password */ 1154 if (pw == NULL) { 1155 rval = 1; /* failure below */ 1156 goto skip; 1157 } 1158 #ifdef USE_PAM 1159 rval = auth_pam(&pw, passwd); 1160 #ifdef notdef 1161 /* If PAM fails, we proceed with other authentications */ 1162 if (rval >= 0) { 1163 goto skip; 1164 } 1165 #else 1166 /* If PAM fails, that's it */ 1167 goto skip; 1168 #endif 1169 #endif 1170 #if defined(KERBEROS) 1171 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 1172 rval = 0; 1173 goto skip; 1174 } 1175 #endif 1176 #if defined(KERBEROS5) 1177 if (k5login(pw, "", hostname, (char *)passwd) == 0) { 1178 rval = 0; 1179 goto skip; 1180 } 1181 #endif 1182 #ifdef SKEY 1183 if (skey_haskey(pw->pw_name) == 0) { 1184 char *p; 1185 int r; 1186 1187 p = xstrdup(passwd); 1188 r = skey_passcheck(pw->pw_name, p); 1189 free(p); 1190 if (r != -1) { 1191 rval = 0; 1192 goto skip; 1193 } 1194 } 1195 #endif 1196 if (!sflag) 1197 rval = checkpassword(pw, passwd); 1198 else 1199 rval = 1; 1200 1201 skip: 1202 1203 /* 1204 * If rval > 0, the user failed the authentication check 1205 * above. If rval == 0, either Kerberos or local 1206 * authentication succeeded. 1207 */ 1208 if (rval) { 1209 reply(530, "%s", rval == 2 ? "Password expired." : 1210 "Login incorrect."); 1211 if (logging) { 1212 syslog(LOG_NOTICE, 1213 "FTP LOGIN FAILED FROM %s", remotehost); 1214 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1215 "FTP LOGIN FAILED FROM %s, %s", 1216 remotehost, curname); 1217 } 1218 pw = NULL; 1219 if (login_attempts++ >= 5) { 1220 syslog(LOG_NOTICE, 1221 "repeated login failures from %s", 1222 remotehost); 1223 exit(0); 1224 } 1225 return; 1226 } 1227 } 1228 1229 /* password ok; check if anything else prevents login */ 1230 if (! permitted) { 1231 reply(530, "User %s may not use FTP.", pw->pw_name); 1232 if (logging) 1233 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 1234 remotehost, pw->pw_name); 1235 goto bad; 1236 } 1237 1238 login_attempts = 0; /* this time successful */ 1239 if (setegid((gid_t)pw->pw_gid) < 0) { 1240 reply(550, "Can't set gid."); 1241 goto bad; 1242 } 1243 #ifdef LOGIN_CAP 1244 if ((lc = login_getpwclass(pw)) != NULL) { 1245 #ifdef notyet 1246 char remote_ip[NI_MAXHOST]; 1247 1248 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1249 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1250 NI_NUMERICHOST)) 1251 *remote_ip = 0; 1252 remote_ip[sizeof(remote_ip) - 1] = 0; 1253 if (!auth_hostok(lc, remotehost, remote_ip)) { 1254 syslog(LOG_INFO|LOG_AUTH, 1255 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1256 pw->pw_name); 1257 reply(530, "Permission denied."); 1258 pw = NULL; 1259 return; 1260 } 1261 if (!auth_timeok(lc, time(NULL))) { 1262 reply(530, "Login not available right now."); 1263 pw = NULL; 1264 return; 1265 } 1266 #endif 1267 } 1268 setsid(); 1269 setusercontext(lc, pw, 0, 1270 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1271 LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1272 #else 1273 (void) initgroups(pw->pw_name, pw->pw_gid); 1274 /* cache groups for cmds.c::matchgroup() */ 1275 #endif 1276 #ifdef USE_PAM 1277 if (pamh) { 1278 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1279 syslog(LOG_ERR, "pam_open_session: %s", 1280 pam_strerror(pamh, e)); 1281 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) 1282 != PAM_SUCCESS) { 1283 syslog(LOG_ERR, "pam_setcred: %s", 1284 pam_strerror(pamh, e)); 1285 } 1286 } 1287 #endif 1288 gidcount = getgroups(0, NULL); 1289 if (gidlist) 1290 free(gidlist); 1291 gidlist = malloc(gidcount * sizeof *gidlist); 1292 gidcount = getgroups(gidcount, gidlist); 1293 1294 /* open utmp/wtmp before chroot */ 1295 login_utmp(ttyline, pw->pw_name, remotehost, &his_addr); 1296 1297 logged_in = 1; 1298 1299 connections = 1; 1300 if (dopidfile) 1301 count_users(); 1302 if (curclass.limit != -1 && connections > curclass.limit) { 1303 if (! EMPTYSTR(curclass.limitfile)) 1304 (void)display_file(conffilename(curclass.limitfile), 1305 530); 1306 reply(530, 1307 "User %s access denied, connection limit of " LLF 1308 " reached.", 1309 pw->pw_name, (LLT)curclass.limit); 1310 syslog(LOG_NOTICE, 1311 "Maximum connection limit of " LLF 1312 " for class %s reached, login refused for %s", 1313 (LLT)curclass.limit, curclass.classname, pw->pw_name); 1314 goto bad; 1315 } 1316 1317 homedir[0] = '/'; 1318 switch (curclass.type) { 1319 case CLASS_GUEST: 1320 /* 1321 * We MUST do a chdir() after the chroot. Otherwise 1322 * the old current directory will be accessible as "." 1323 * outside the new root! 1324 */ 1325 format_path(root, 1326 curclass.chroot ? curclass.chroot : 1327 anondir ? anondir : 1328 pw->pw_dir); 1329 format_path(homedir, 1330 curclass.homedir ? curclass.homedir : 1331 "/"); 1332 if (EMPTYSTR(homedir)) 1333 homedir[0] = '/'; 1334 if (EMPTYSTR(root) || chroot(root) < 0) { 1335 syslog(LOG_NOTICE, 1336 "GUEST user %s: can't chroot to %s: %m", 1337 pw->pw_name, root); 1338 goto bad_guest; 1339 } 1340 if (chdir(homedir) < 0) { 1341 syslog(LOG_NOTICE, 1342 "GUEST user %s: can't chdir to %s: %m", 1343 pw->pw_name, homedir); 1344 bad_guest: 1345 reply(550, "Can't set guest privileges."); 1346 goto bad; 1347 } 1348 break; 1349 case CLASS_CHROOT: 1350 format_path(root, 1351 curclass.chroot ? curclass.chroot : 1352 pw->pw_dir); 1353 format_path(homedir, 1354 curclass.homedir ? curclass.homedir : 1355 "/"); 1356 if (EMPTYSTR(homedir)) 1357 homedir[0] = '/'; 1358 if (EMPTYSTR(root) || chroot(root) < 0) { 1359 syslog(LOG_NOTICE, 1360 "CHROOT user %s: can't chroot to %s: %m", 1361 pw->pw_name, root); 1362 goto bad_chroot; 1363 } 1364 if (chdir(homedir) < 0) { 1365 syslog(LOG_NOTICE, 1366 "CHROOT user %s: can't chdir to %s: %m", 1367 pw->pw_name, homedir); 1368 bad_chroot: 1369 reply(550, "Can't change root."); 1370 goto bad; 1371 } 1372 break; 1373 case CLASS_REAL: 1374 /* only chroot REAL if explictly requested */ 1375 if (! EMPTYSTR(curclass.chroot)) { 1376 format_path(root, curclass.chroot); 1377 if (EMPTYSTR(root) || chroot(root) < 0) { 1378 syslog(LOG_NOTICE, 1379 "REAL user %s: can't chroot to %s: %m", 1380 pw->pw_name, root); 1381 goto bad_chroot; 1382 } 1383 } 1384 format_path(homedir, 1385 curclass.homedir ? curclass.homedir : 1386 pw->pw_dir); 1387 if (EMPTYSTR(homedir) || chdir(homedir) < 0) { 1388 if (chdir("/") < 0) { 1389 syslog(LOG_NOTICE, 1390 "REAL user %s: can't chdir to %s: %m", 1391 pw->pw_name, 1392 !EMPTYSTR(homedir) ? homedir : "/"); 1393 reply(530, 1394 "User %s: can't change directory to %s.", 1395 pw->pw_name, 1396 !EMPTYSTR(homedir) ? homedir : "/"); 1397 goto bad; 1398 } else { 1399 reply(-230, 1400 "No directory! Logging in with home=/"); 1401 homedir[0] = '/'; 1402 } 1403 } 1404 break; 1405 } 1406 #ifndef LOGIN_CAP 1407 setsid(); 1408 setlogin(pw->pw_name); 1409 #endif 1410 if (dropprivs || 1411 (curclass.type != CLASS_REAL && 1412 ntohs(ctrl_addr.su_port) > IPPORT_RESERVED + 1)) { 1413 dropprivs++; 1414 if (setgid((gid_t)pw->pw_gid) < 0) { 1415 reply(550, "Can't set gid."); 1416 goto bad; 1417 } 1418 if (setuid((uid_t)pw->pw_uid) < 0) { 1419 reply(550, "Can't set uid."); 1420 goto bad; 1421 } 1422 } else { 1423 if (seteuid((uid_t)pw->pw_uid) < 0) { 1424 reply(550, "Can't set uid."); 1425 goto bad; 1426 } 1427 } 1428 setenv("HOME", homedir, 1); 1429 1430 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 1431 quietmessages = 1; 1432 1433 /* 1434 * Display a login message, if it exists. 1435 * N.B. reply(230,) must follow the message. 1436 */ 1437 if (! EMPTYSTR(curclass.motd)) 1438 (void)display_file(conffilename(curclass.motd), 230); 1439 show_chdir_messages(230); 1440 if (curclass.type == CLASS_GUEST) { 1441 char *p; 1442 1443 reply(230, "Guest login ok, access restrictions apply."); 1444 #if HAVE_SETPROCTITLE 1445 snprintf(proctitle, sizeof(proctitle), 1446 "%s: anonymous/%s", remotehost, passwd); 1447 setproctitle("%s", proctitle); 1448 #endif /* HAVE_SETPROCTITLE */ 1449 if (logging) 1450 syslog(LOG_INFO, 1451 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 1452 remotehost, passwd, 1453 curclass.classname, CURCLASSTYPE); 1454 /* store guest password reply into pw_passwd */ 1455 REASSIGN(pw->pw_passwd, xstrdup(passwd)); 1456 for (p = pw->pw_passwd; *p; p++) 1457 if (!isgraph((unsigned char)*p)) 1458 *p = '_'; 1459 } else { 1460 reply(230, "User %s logged in.", pw->pw_name); 1461 #if HAVE_SETPROCTITLE 1462 snprintf(proctitle, sizeof(proctitle), 1463 "%s: %s", remotehost, pw->pw_name); 1464 setproctitle("%s", proctitle); 1465 #endif /* HAVE_SETPROCTITLE */ 1466 if (logging) 1467 syslog(LOG_INFO, 1468 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1469 remotehost, pw->pw_name, 1470 curclass.classname, CURCLASSTYPE); 1471 } 1472 (void) umask(curclass.umask); 1473 #ifdef LOGIN_CAP 1474 login_close(lc); 1475 #endif 1476 return; 1477 1478 bad: 1479 #ifdef LOGIN_CAP 1480 login_close(lc); 1481 #endif 1482 /* Forget all about it... */ 1483 end_login(); 1484 } 1485 1486 void 1487 retrieve(char *argv[], const char *name) 1488 { 1489 FILE *fin, *dout; 1490 struct stat st; 1491 int (*closefunc)(FILE *) = NULL; 1492 int dolog, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1493 struct timeval start, finish, td, *tdp; 1494 struct rusage rusage_before, rusage_after; 1495 const char *dispname; 1496 char *error; 1497 1498 sendrv = closerv = stderrfd = -1; 1499 isconversion = isdata = isls = dolog = 0; 1500 tdp = NULL; 1501 dispname = name; 1502 fin = dout = NULL; 1503 error = NULL; 1504 if (argv == NULL) { /* if not running a command ... */ 1505 dolog = 1; 1506 isdata = 1; 1507 fin = fopen(name, "r"); 1508 closefunc = fclose; 1509 if (fin == NULL) /* doesn't exist?; try a conversion */ 1510 argv = do_conversion(name); 1511 if (argv != NULL) { 1512 isconversion++; 1513 syslog(LOG_DEBUG, "get command: '%s' on '%s'", 1514 argv[0], name); 1515 } 1516 } 1517 if (argv != NULL) { 1518 char temp[MAXPATHLEN]; 1519 1520 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1521 isls = 1; 1522 stderrfd = -1; 1523 } else { 1524 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1525 stderrfd = mkstemp(temp); 1526 if (stderrfd != -1) 1527 (void)unlink(temp); 1528 } 1529 dispname = argv[0]; 1530 fin = ftpd_popen(argv, "r", stderrfd); 1531 closefunc = ftpd_pclose; 1532 st.st_size = -1; 1533 st.st_blksize = BUFSIZ; 1534 } 1535 if (fin == NULL) { 1536 if (errno != 0) { 1537 perror_reply(550, dispname); 1538 if (dolog) 1539 logxfer("get", -1, name, NULL, NULL, 1540 strerror(errno)); 1541 } 1542 goto cleanupretrieve; 1543 } 1544 byte_count = -1; 1545 if (argv == NULL 1546 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1547 error = "Not a plain file"; 1548 reply(550, "%s: %s.", dispname, error); 1549 goto done; 1550 } 1551 if (restart_point) { 1552 if (type == TYPE_A) { 1553 off_t i; 1554 int c; 1555 1556 for (i = 0; i < restart_point; i++) { 1557 if ((c=getc(fin)) == EOF) { 1558 error = strerror(errno); 1559 perror_reply(550, dispname); 1560 goto done; 1561 } 1562 if (c == '\n') 1563 i++; 1564 } 1565 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1566 error = strerror(errno); 1567 perror_reply(550, dispname); 1568 goto done; 1569 } 1570 } 1571 dout = dataconn(dispname, st.st_size, "w"); 1572 if (dout == NULL) 1573 goto done; 1574 1575 (void)getrusage(RUSAGE_SELF, &rusage_before); 1576 (void)gettimeofday(&start, NULL); 1577 sendrv = send_data(fin, dout, &st, isdata); 1578 (void)gettimeofday(&finish, NULL); 1579 (void)getrusage(RUSAGE_SELF, &rusage_after); 1580 closedataconn(dout); /* close now to affect timing stats */ 1581 timersub(&finish, &start, &td); 1582 tdp = &td; 1583 done: 1584 if (dolog) { 1585 logxfer("get", byte_count, name, NULL, tdp, error); 1586 if (tdp != NULL) 1587 logrusage(&rusage_before, &rusage_after); 1588 } 1589 closerv = (*closefunc)(fin); 1590 if (sendrv == 0) { 1591 FILE *errf; 1592 struct stat sb; 1593 1594 if (!isls && argv != NULL && closerv != 0) { 1595 reply(-226, 1596 "Command returned an exit status of %d", 1597 closerv); 1598 if (isconversion) 1599 syslog(LOG_WARNING, 1600 "retrieve command: '%s' returned %d", 1601 argv[0], closerv); 1602 } 1603 if (!isls && argv != NULL && stderrfd != -1 && 1604 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1605 ((errf = fdopen(stderrfd, "r")) != NULL)) { 1606 char *cp, line[LINE_MAX]; 1607 1608 reply(-226, "Command error messages:"); 1609 rewind(errf); 1610 while (fgets(line, sizeof(line), errf) != NULL) { 1611 if ((cp = strchr(line, '\n')) != NULL) 1612 *cp = '\0'; 1613 reply(0, " %s", line); 1614 } 1615 (void) fflush(stdout); 1616 (void) fclose(errf); 1617 /* a reply(226,) must follow */ 1618 } 1619 reply(226, "Transfer complete."); 1620 } 1621 cleanupretrieve: 1622 if (stderrfd != -1) 1623 (void)close(stderrfd); 1624 if (isconversion) 1625 free(argv); 1626 } 1627 1628 void 1629 store(const char *name, const char *fmode, int unique) 1630 { 1631 FILE *fout, *din; 1632 struct stat st; 1633 int (*closefunc)(FILE *); 1634 struct timeval start, finish, td, *tdp; 1635 char *desc, *error; 1636 1637 din = NULL; 1638 desc = (*fmode == 'w') ? "put" : "append"; 1639 error = NULL; 1640 if (unique && stat(name, &st) == 0 && 1641 (name = gunique(name)) == NULL) { 1642 logxfer(desc, -1, name, NULL, NULL, 1643 "cannot create unique file"); 1644 goto cleanupstore; 1645 } 1646 1647 if (restart_point) 1648 fmode = "r+"; 1649 fout = fopen(name, fmode); 1650 closefunc = fclose; 1651 tdp = NULL; 1652 if (fout == NULL) { 1653 perror_reply(553, name); 1654 logxfer(desc, -1, name, NULL, NULL, strerror(errno)); 1655 goto cleanupstore; 1656 } 1657 byte_count = -1; 1658 if (restart_point) { 1659 if (type == TYPE_A) { 1660 off_t i; 1661 int c; 1662 1663 for (i = 0; i < restart_point; i++) { 1664 if ((c=getc(fout)) == EOF) { 1665 error = strerror(errno); 1666 perror_reply(550, name); 1667 goto done; 1668 } 1669 if (c == '\n') 1670 i++; 1671 } 1672 /* 1673 * We must do this seek to "current" position 1674 * because we are changing from reading to 1675 * writing. 1676 */ 1677 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1678 error = strerror(errno); 1679 perror_reply(550, name); 1680 goto done; 1681 } 1682 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1683 error = strerror(errno); 1684 perror_reply(550, name); 1685 goto done; 1686 } 1687 } 1688 din = dataconn(name, (off_t)-1, "r"); 1689 if (din == NULL) 1690 goto done; 1691 (void)gettimeofday(&start, NULL); 1692 if (receive_data(din, fout) == 0) { 1693 if (unique) 1694 reply(226, "Transfer complete (unique file name:%s).", 1695 name); 1696 else 1697 reply(226, "Transfer complete."); 1698 } 1699 (void)gettimeofday(&finish, NULL); 1700 closedataconn(din); /* close now to affect timing stats */ 1701 timersub(&finish, &start, &td); 1702 tdp = &td; 1703 done: 1704 logxfer(desc, byte_count, name, NULL, tdp, error); 1705 (*closefunc)(fout); 1706 cleanupstore: 1707 ; 1708 } 1709 1710 static FILE * 1711 getdatasock(const char *fmode) 1712 { 1713 int on, s, t, tries; 1714 in_port_t port; 1715 1716 on = 1; 1717 if (data >= 0) 1718 return (fdopen(data, fmode)); 1719 if (! dropprivs) 1720 (void) seteuid((uid_t)0); 1721 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1722 if (s < 0) 1723 goto bad; 1724 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1725 (char *) &on, sizeof(on)) < 0) 1726 goto bad; 1727 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1728 (char *) &on, sizeof(on)) < 0) 1729 goto bad; 1730 /* anchor socket to avoid multi-homing problems */ 1731 data_source = ctrl_addr; 1732 /* 1733 * By default source port for PORT connctions is 1734 * ctrlport-1 (see RFC959 section 5.2). 1735 * However, if privs have been dropped and that 1736 * would be < IPPORT_RESERVED, use a random port 1737 * instead. 1738 */ 1739 if (dataport) 1740 port = dataport; 1741 else 1742 port = ntohs(ctrl_addr.su_port) - 1; 1743 if (dropprivs && port < IPPORT_RESERVED) 1744 port = 0; /* use random port */ 1745 data_source.su_port = htons(port); 1746 1747 for (tries = 1; ; tries++) { 1748 if (bind(s, (struct sockaddr *)&data_source.si_su, 1749 data_source.su_len) >= 0) 1750 break; 1751 if (errno != EADDRINUSE || tries > 10) 1752 goto bad; 1753 sleep(tries); 1754 } 1755 if (! dropprivs) 1756 (void) seteuid((uid_t)pw->pw_uid); 1757 #ifdef IP_TOS 1758 if (!mapped && ctrl_addr.su_family == AF_INET) { 1759 on = IPTOS_THROUGHPUT; 1760 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1761 sizeof(int)) < 0) 1762 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1763 } 1764 #endif 1765 return (fdopen(s, fmode)); 1766 bad: 1767 /* Return the real value of errno (close may change it) */ 1768 t = errno; 1769 if (! dropprivs) 1770 (void) seteuid((uid_t)pw->pw_uid); 1771 (void) close(s); 1772 errno = t; 1773 return (NULL); 1774 } 1775 1776 FILE * 1777 dataconn(const char *name, off_t size, const char *fmode) 1778 { 1779 char sizebuf[32]; 1780 FILE *file; 1781 int retry, tos, keepalive, conerrno; 1782 1783 file_size = size; 1784 byte_count = 0; 1785 if (size != (off_t) -1) 1786 (void)snprintf(sizebuf, sizeof(sizebuf), " (" LLF " byte%s)", 1787 (LLT)size, PLURAL(size)); 1788 else 1789 sizebuf[0] = '\0'; 1790 if (pdata >= 0) { 1791 struct sockinet from; 1792 int s, fromlen = sizeof(from.su_len); 1793 1794 (void) alarm(curclass.timeout); 1795 s = accept(pdata, (struct sockaddr *)&from.si_su, &fromlen); 1796 (void) alarm(0); 1797 if (s < 0) { 1798 reply(425, "Can't open data connection."); 1799 (void) close(pdata); 1800 pdata = -1; 1801 return (NULL); 1802 } 1803 (void) close(pdata); 1804 pdata = s; 1805 switch (from.su_family) { 1806 case AF_INET: 1807 #ifdef IP_TOS 1808 if (!mapped) { 1809 tos = IPTOS_THROUGHPUT; 1810 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1811 (char *)&tos, sizeof(int)); 1812 } 1813 break; 1814 #endif 1815 } 1816 /* Set keepalives on the socket to detect dropped conns. */ 1817 #ifdef SO_KEEPALIVE 1818 keepalive = 1; 1819 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1820 (char *)&keepalive, sizeof(int)); 1821 #endif 1822 reply(150, "Opening %s mode data connection for '%s'%s.", 1823 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1824 return (fdopen(pdata, fmode)); 1825 } 1826 if (data >= 0) { 1827 reply(125, "Using existing data connection for '%s'%s.", 1828 name, sizebuf); 1829 usedefault = 1; 1830 return (fdopen(data, fmode)); 1831 } 1832 if (usedefault) 1833 data_dest = his_addr; 1834 usedefault = 1; 1835 retry = conerrno = 0; 1836 do { 1837 file = getdatasock(fmode); 1838 if (file == NULL) { 1839 char hbuf[NI_MAXHOST]; 1840 char pbuf[NI_MAXSERV]; 1841 1842 if (getnameinfo((struct sockaddr *)&data_source.si_su, 1843 data_source.su_len, hbuf, sizeof(hbuf), pbuf, 1844 sizeof(pbuf), NI_NUMERICHOST | NI_NUMERICSERV)) 1845 strlcpy(hbuf, "?", sizeof(hbuf)); 1846 reply(425, "Can't create data socket (%s,%s): %s.", 1847 hbuf, pbuf, strerror(errno)); 1848 return (NULL); 1849 } 1850 data = fileno(file); 1851 conerrno = 0; 1852 if (connect(data, (struct sockaddr *)&data_dest.si_su, 1853 data_dest.su_len) == 0) 1854 break; 1855 conerrno = errno; 1856 (void) fclose(file); 1857 file = NULL; 1858 data = -1; 1859 if (conerrno == EADDRINUSE) { 1860 sleep((unsigned) swaitint); 1861 retry += swaitint; 1862 } else { 1863 break; 1864 } 1865 } while (retry <= swaitmax); 1866 if (conerrno != 0) { 1867 perror_reply(425, "Can't build data connection"); 1868 return (NULL); 1869 } 1870 reply(150, "Opening %s mode data connection for '%s'%s.", 1871 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1872 return (file); 1873 } 1874 1875 void 1876 closedataconn(FILE *fd) 1877 { 1878 1879 if (fd == NULL) 1880 return; 1881 (void)fclose(fd); 1882 data = -1; 1883 if (pdata >= 0) 1884 (void)close(pdata); 1885 pdata = -1; 1886 } 1887 1888 int 1889 write_data(int fd, char *buf, size_t size, off_t *bufrem, 1890 struct timeval *then, int isdata) 1891 { 1892 struct timeval now, td; 1893 ssize_t c; 1894 1895 while (size > 0) { 1896 c = size; 1897 if (curclass.writesize) { 1898 if (curclass.writesize < c) 1899 c = curclass.writesize; 1900 } 1901 if (curclass.rateget) { 1902 if (*bufrem < c) 1903 c = *bufrem; 1904 } 1905 (void) alarm(curclass.timeout); 1906 c = write(fd, buf, c); 1907 if (c <= 0) 1908 return (1); 1909 buf += c; 1910 size -= c; 1911 byte_count += c; 1912 if (isdata) { 1913 total_data_out += c; 1914 total_data += c; 1915 } 1916 total_bytes_out += c; 1917 total_bytes += c; 1918 if (curclass.rateget) { 1919 *bufrem -= c; 1920 if (*bufrem == 0) { 1921 (void)gettimeofday(&now, NULL); 1922 timersub(&now, then, &td); 1923 if (td.tv_sec == 0) { 1924 usleep(1000000 - td.tv_usec); 1925 (void)gettimeofday(then, NULL); 1926 } else 1927 *then = now; 1928 *bufrem = curclass.rateget; 1929 } 1930 } 1931 } 1932 return (0); 1933 } 1934 1935 static enum send_status 1936 send_data_with_read(int filefd, int netfd, const struct stat *st, int isdata) 1937 { 1938 struct timeval then; 1939 off_t bufrem; 1940 size_t readsize; 1941 char *buf; 1942 int c, error; 1943 1944 if (curclass.readsize) 1945 readsize = curclass.readsize; 1946 else 1947 readsize = (size_t)st->st_blksize; 1948 if ((buf = malloc(readsize)) == NULL) { 1949 perror_reply(451, "Local resource failure: malloc"); 1950 return (SS_NO_TRANSFER); 1951 } 1952 1953 if (curclass.rateget) { 1954 bufrem = curclass.rateget; 1955 (void)gettimeofday(&then, NULL); 1956 } 1957 while (1) { 1958 (void) alarm(curclass.timeout); 1959 c = read(filefd, buf, readsize); 1960 if (c == 0) 1961 error = SS_SUCCESS; 1962 else if (c < 0) 1963 error = SS_FILE_ERROR; 1964 else if (write_data(netfd, buf, c, &bufrem, &then, isdata)) 1965 error = SS_DATA_ERROR; 1966 else if (urgflag && handleoobcmd()) 1967 error = SS_ABORTED; 1968 else 1969 continue; 1970 1971 free(buf); 1972 return (error); 1973 } 1974 } 1975 1976 static enum send_status 1977 send_data_with_mmap(int filefd, int netfd, const struct stat *st, int isdata) 1978 { 1979 struct timeval then; 1980 off_t bufrem, filesize, off, origoff; 1981 size_t mapsize, winsize; 1982 int error, sendbufsize, sendlowat; 1983 void *win; 1984 1985 if (curclass.sendbufsize) { 1986 sendbufsize = curclass.sendbufsize; 1987 if (setsockopt(netfd, SOL_SOCKET, SO_SNDBUF, 1988 &sendbufsize, sizeof(int)) == -1) 1989 syslog(LOG_WARNING, "setsockopt(SO_SNDBUF, %d): %m", 1990 sendbufsize); 1991 } 1992 1993 if (curclass.sendlowat) { 1994 sendlowat = curclass.sendlowat; 1995 if (setsockopt(netfd, SOL_SOCKET, SO_SNDLOWAT, 1996 &sendlowat, sizeof(int)) == -1) 1997 syslog(LOG_WARNING, "setsockopt(SO_SNDLOWAT, %d): %m", 1998 sendlowat); 1999 } 2000 2001 winsize = curclass.mmapsize; 2002 filesize = st->st_size; 2003 if (debug) 2004 syslog(LOG_INFO, "mmapsize = %ld, writesize = %ld", 2005 (long)winsize, (long)curclass.writesize); 2006 if (winsize == 0) 2007 goto try_read; 2008 2009 off = lseek(filefd, (off_t)0, SEEK_CUR); 2010 if (off == -1) 2011 goto try_read; 2012 2013 origoff = off; 2014 if (curclass.rateget) { 2015 bufrem = curclass.rateget; 2016 (void)gettimeofday(&then, NULL); 2017 } 2018 while (1) { 2019 mapsize = MIN(filesize - off, winsize); 2020 if (mapsize == 0) 2021 break; 2022 win = mmap(NULL, mapsize, PROT_READ, 2023 MAP_FILE|MAP_SHARED, filefd, off); 2024 if (win == MAP_FAILED) { 2025 if (off == origoff) 2026 goto try_read; 2027 return (SS_FILE_ERROR); 2028 } 2029 (void) madvise(win, mapsize, MADV_SEQUENTIAL); 2030 error = write_data(netfd, win, mapsize, &bufrem, &then, 2031 isdata); 2032 (void) madvise(win, mapsize, MADV_DONTNEED); 2033 munmap(win, mapsize); 2034 if (urgflag && handleoobcmd()) 2035 return (SS_ABORTED); 2036 if (error) 2037 return (SS_DATA_ERROR); 2038 off += mapsize; 2039 } 2040 return (SS_SUCCESS); 2041 2042 try_read: 2043 return (send_data_with_read(filefd, netfd, st, isdata)); 2044 } 2045 2046 /* 2047 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 2048 * encapsulation of the data subject to Mode, Structure, and Type. 2049 * 2050 * NB: Form isn't handled. 2051 */ 2052 static int 2053 send_data(FILE *instr, FILE *outstr, const struct stat *st, int isdata) 2054 { 2055 int c, filefd, netfd, rval; 2056 2057 urgflag = 0; 2058 transflag = 1; 2059 rval = -1; 2060 2061 switch (type) { 2062 2063 case TYPE_A: 2064 /* XXXLUKEM: rate limit ascii send (get) */ 2065 (void) alarm(curclass.timeout); 2066 while ((c = getc(instr)) != EOF) { 2067 if (urgflag && handleoobcmd()) 2068 goto cleanup_send_data; 2069 byte_count++; 2070 if (c == '\n') { 2071 if (ferror(outstr)) 2072 goto data_err; 2073 (void) putc('\r', outstr); 2074 if (isdata) { 2075 total_data_out++; 2076 total_data++; 2077 } 2078 total_bytes_out++; 2079 total_bytes++; 2080 } 2081 (void) putc(c, outstr); 2082 if (isdata) { 2083 total_data_out++; 2084 total_data++; 2085 } 2086 total_bytes_out++; 2087 total_bytes++; 2088 if ((byte_count % 4096) == 0) 2089 (void) alarm(curclass.timeout); 2090 } 2091 (void) alarm(0); 2092 fflush(outstr); 2093 if (ferror(instr)) 2094 goto file_err; 2095 if (ferror(outstr)) 2096 goto data_err; 2097 rval = 0; 2098 goto cleanup_send_data; 2099 2100 case TYPE_I: 2101 case TYPE_L: 2102 filefd = fileno(instr); 2103 netfd = fileno(outstr); 2104 switch (send_data_with_mmap(filefd, netfd, st, isdata)) { 2105 2106 case SS_SUCCESS: 2107 break; 2108 2109 case SS_ABORTED: 2110 case SS_NO_TRANSFER: 2111 goto cleanup_send_data; 2112 2113 case SS_FILE_ERROR: 2114 goto file_err; 2115 2116 case SS_DATA_ERROR: 2117 goto data_err; 2118 } 2119 rval = 0; 2120 goto cleanup_send_data; 2121 2122 default: 2123 reply(550, "Unimplemented TYPE %d in send_data", type); 2124 goto cleanup_send_data; 2125 } 2126 2127 data_err: 2128 (void) alarm(0); 2129 perror_reply(426, "Data connection"); 2130 goto cleanup_send_data; 2131 2132 file_err: 2133 (void) alarm(0); 2134 perror_reply(551, "Error on input file"); 2135 goto cleanup_send_data; 2136 2137 cleanup_send_data: 2138 (void) alarm(0); 2139 transflag = 0; 2140 urgflag = 0; 2141 if (isdata) { 2142 total_files_out++; 2143 total_files++; 2144 } 2145 total_xfers_out++; 2146 total_xfers++; 2147 return (rval); 2148 } 2149 2150 /* 2151 * Transfer data from peer to "outstr" using the appropriate encapulation of 2152 * the data subject to Mode, Structure, and Type. 2153 * 2154 * N.B.: Form isn't handled. 2155 */ 2156 static int 2157 receive_data(FILE *instr, FILE *outstr) 2158 { 2159 int c, bare_lfs, netfd, filefd, rval; 2160 off_t byteswritten; 2161 char buf[BUFSIZ]; 2162 struct sigaction sa, sa_saved; 2163 #ifdef __GNUC__ 2164 (void) &bare_lfs; 2165 #endif 2166 2167 memset(&sa, 0, sizeof(sa)); 2168 sigfillset(&sa.sa_mask); 2169 sa.sa_flags = SA_RESTART; 2170 sa.sa_handler = lostconn; 2171 (void) sigaction(SIGALRM, &sa, &sa_saved); 2172 2173 bare_lfs = 0; 2174 urgflag = 0; 2175 transflag = 1; 2176 rval = -1; 2177 byteswritten = 0; 2178 2179 #define FILESIZECHECK(x) \ 2180 do { \ 2181 if (curclass.maxfilesize != -1 && \ 2182 (x) > curclass.maxfilesize) { \ 2183 errno = EFBIG; \ 2184 goto file_err; \ 2185 } \ 2186 } while (0) 2187 2188 switch (type) { 2189 2190 case TYPE_I: 2191 case TYPE_L: 2192 netfd = fileno(instr); 2193 filefd = fileno(outstr); 2194 (void) alarm(curclass.timeout); 2195 if (curclass.rateput) { 2196 while (1) { 2197 int d; 2198 struct timeval then, now, td; 2199 off_t bufrem; 2200 2201 (void)gettimeofday(&then, NULL); 2202 errno = c = d = 0; 2203 for (bufrem = curclass.rateput; bufrem > 0; ) { 2204 if ((c = read(netfd, buf, 2205 MIN(sizeof(buf), bufrem))) <= 0) 2206 goto recvdone; 2207 if (urgflag && handleoobcmd()) 2208 goto cleanup_recv_data; 2209 FILESIZECHECK(byte_count + c); 2210 if ((d = write(filefd, buf, c)) != c) 2211 goto file_err; 2212 (void) alarm(curclass.timeout); 2213 bufrem -= c; 2214 byte_count += c; 2215 total_data_in += c; 2216 total_data += c; 2217 total_bytes_in += c; 2218 total_bytes += c; 2219 } 2220 (void)gettimeofday(&now, NULL); 2221 timersub(&now, &then, &td); 2222 if (td.tv_sec == 0) 2223 usleep(1000000 - td.tv_usec); 2224 } 2225 } else { 2226 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 2227 if (urgflag && handleoobcmd()) 2228 goto cleanup_recv_data; 2229 FILESIZECHECK(byte_count + c); 2230 if (write(filefd, buf, c) != c) 2231 goto file_err; 2232 (void) alarm(curclass.timeout); 2233 byte_count += c; 2234 total_data_in += c; 2235 total_data += c; 2236 total_bytes_in += c; 2237 total_bytes += c; 2238 } 2239 } 2240 recvdone: 2241 if (c < 0) 2242 goto data_err; 2243 rval = 0; 2244 goto cleanup_recv_data; 2245 2246 case TYPE_E: 2247 reply(553, "TYPE E not implemented."); 2248 goto cleanup_recv_data; 2249 2250 case TYPE_A: 2251 (void) alarm(curclass.timeout); 2252 /* XXXLUKEM: rate limit ascii receive (put) */ 2253 while ((c = getc(instr)) != EOF) { 2254 if (urgflag && handleoobcmd()) 2255 goto cleanup_recv_data; 2256 byte_count++; 2257 total_data_in++; 2258 total_data++; 2259 total_bytes_in++; 2260 total_bytes++; 2261 if ((byte_count % 4096) == 0) 2262 (void) alarm(curclass.timeout); 2263 if (c == '\n') 2264 bare_lfs++; 2265 while (c == '\r') { 2266 if (ferror(outstr)) 2267 goto data_err; 2268 if ((c = getc(instr)) != '\n') { 2269 byte_count++; 2270 total_data_in++; 2271 total_data++; 2272 total_bytes_in++; 2273 total_bytes++; 2274 if ((byte_count % 4096) == 0) 2275 (void) alarm(curclass.timeout); 2276 byteswritten++; 2277 FILESIZECHECK(byteswritten); 2278 (void) putc ('\r', outstr); 2279 if (c == '\0' || c == EOF) 2280 goto contin2; 2281 } 2282 } 2283 byteswritten++; 2284 FILESIZECHECK(byteswritten); 2285 (void) putc(c, outstr); 2286 contin2: ; 2287 } 2288 (void) alarm(0); 2289 fflush(outstr); 2290 if (ferror(instr)) 2291 goto data_err; 2292 if (ferror(outstr)) 2293 goto file_err; 2294 if (bare_lfs) { 2295 reply(-226, 2296 "WARNING! %d bare linefeeds received in ASCII mode", 2297 bare_lfs); 2298 reply(0, "File may not have transferred correctly."); 2299 } 2300 rval = 0; 2301 goto cleanup_recv_data; 2302 2303 default: 2304 reply(550, "Unimplemented TYPE %d in receive_data", type); 2305 goto cleanup_recv_data; 2306 } 2307 #undef FILESIZECHECK 2308 2309 data_err: 2310 (void) alarm(0); 2311 perror_reply(426, "Data Connection"); 2312 goto cleanup_recv_data; 2313 2314 file_err: 2315 (void) alarm(0); 2316 perror_reply(452, "Error writing file"); 2317 goto cleanup_recv_data; 2318 2319 cleanup_recv_data: 2320 (void) alarm(0); 2321 (void) sigaction(SIGALRM, &sa_saved, NULL); 2322 transflag = 0; 2323 urgflag = 0; 2324 total_files_in++; 2325 total_files++; 2326 total_xfers_in++; 2327 total_xfers++; 2328 return (rval); 2329 } 2330 2331 void 2332 statcmd(void) 2333 { 2334 struct sockinet *su = NULL; 2335 static char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV]; 2336 u_char *a, *p; 2337 int ispassive, af; 2338 off_t otbi, otbo, otb; 2339 2340 a = p = (u_char *)NULL; 2341 2342 reply(-211, "%s FTP server status:", hostname); 2343 reply(0, "Version: %s", EMPTYSTR(version) ? "<suppressed>" : version); 2344 hbuf[0] = '\0'; 2345 if (!getnameinfo((struct sockaddr *)&his_addr.si_su, his_addr.su_len, 2346 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) 2347 && strcmp(remotehost, hbuf) != 0) 2348 reply(0, "Connected to %s (%s)", remotehost, hbuf); 2349 else 2350 reply(0, "Connected to %s", remotehost); 2351 2352 if (logged_in) { 2353 if (curclass.type == CLASS_GUEST) 2354 reply(0, "Logged in anonymously"); 2355 else 2356 reply(0, "Logged in as %s%s", pw->pw_name, 2357 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 2358 } else if (askpasswd) 2359 reply(0, "Waiting for password"); 2360 else 2361 reply(0, "Waiting for user name"); 2362 cprintf(stdout, " TYPE: %s", typenames[type]); 2363 if (type == TYPE_A || type == TYPE_E) 2364 cprintf(stdout, ", FORM: %s", formnames[form]); 2365 if (type == TYPE_L) { 2366 #if NBBY == 8 2367 cprintf(stdout, " %d", NBBY); 2368 #else 2369 /* XXX: `bytesize' needs to be defined in this case */ 2370 cprintf(stdout, " %d", bytesize); 2371 #endif 2372 } 2373 cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n", 2374 strunames[stru], modenames[mode]); 2375 ispassive = 0; 2376 if (data != -1) { 2377 reply(0, "Data connection open"); 2378 su = NULL; 2379 } else if (pdata != -1) { 2380 reply(0, "in Passive mode"); 2381 if (curclass.advertise.su_len != 0) 2382 su = &curclass.advertise; 2383 else 2384 su = &pasv_addr; 2385 ispassive = 1; 2386 goto printaddr; 2387 } else if (usedefault == 0) { 2388 su = (struct sockinet *)&data_dest; 2389 2390 if (epsvall) { 2391 reply(0, "EPSV only mode (EPSV ALL)"); 2392 goto epsvonly; 2393 } 2394 printaddr: 2395 /* PASV/PORT */ 2396 if (su->su_family == AF_INET) { 2397 a = (u_char *) &su->su_addr; 2398 p = (u_char *) &su->su_port; 2399 #define UC(b) (((int) b) & 0xff) 2400 reply(0, "%s (%d,%d,%d,%d,%d,%d)", 2401 ispassive ? "PASV" : "PORT" , 2402 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2403 UC(p[0]), UC(p[1])); 2404 } 2405 2406 /* LPSV/LPRT */ 2407 { 2408 int alen, i; 2409 2410 alen = 0; 2411 switch (su->su_family) { 2412 case AF_INET: 2413 a = (u_char *) &su->su_addr; 2414 p = (u_char *) &su->su_port; 2415 alen = sizeof(su->su_addr); 2416 af = 4; 2417 break; 2418 #ifdef INET6 2419 case AF_INET6: 2420 a = (u_char *) &su->su_6addr; 2421 p = (u_char *) &su->su_port; 2422 alen = sizeof(su->su_6addr); 2423 af = 6; 2424 break; 2425 #endif 2426 default: 2427 af = 0; 2428 break; 2429 } 2430 if (af) { 2431 cprintf(stdout, " %s (%d,%d", 2432 ispassive ? "LPSV" : "LPRT", af, alen); 2433 for (i = 0; i < alen; i++) 2434 cprintf(stdout, ",%d", UC(a[i])); 2435 cprintf(stdout, ",%d,%d,%d)\r\n", 2436 2, UC(p[0]), UC(p[1])); 2437 #undef UC 2438 } 2439 } 2440 2441 /* EPRT/EPSV */ 2442 epsvonly: 2443 af = af2epsvproto(su->su_family); 2444 hbuf[0] = '\0'; 2445 if (af > 0) { 2446 struct sockinet tmp; 2447 2448 tmp = *su; 2449 #ifdef INET6 2450 if (tmp.su_family == AF_INET6) 2451 tmp.su_scope_id = 0; 2452 #endif 2453 if (getnameinfo((struct sockaddr *)&tmp.si_su, 2454 tmp.su_len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), 2455 NI_NUMERICHOST | NI_NUMERICSERV) == 0) 2456 reply(0, "%s (|%d|%s|%s|)", 2457 ispassive ? "EPSV" : "EPRT", 2458 af, hbuf, sbuf); 2459 } 2460 } else 2461 reply(0, "No data connection"); 2462 2463 if (logged_in) { 2464 reply(0, 2465 "Data sent: " LLF " byte%s in " LLF " file%s", 2466 (LLT)total_data_out, PLURAL(total_data_out), 2467 (LLT)total_files_out, PLURAL(total_files_out)); 2468 reply(0, 2469 "Data received: " LLF " byte%s in " LLF " file%s", 2470 (LLT)total_data_in, PLURAL(total_data_in), 2471 (LLT)total_files_in, PLURAL(total_files_in)); 2472 reply(0, 2473 "Total data: " LLF " byte%s in " LLF " file%s", 2474 (LLT)total_data, PLURAL(total_data), 2475 (LLT)total_files, PLURAL(total_files)); 2476 } 2477 otbi = total_bytes_in; 2478 otbo = total_bytes_out; 2479 otb = total_bytes; 2480 reply(0, "Traffic sent: " LLF " byte%s in " LLF " transfer%s", 2481 (LLT)otbo, PLURAL(otbo), 2482 (LLT)total_xfers_out, PLURAL(total_xfers_out)); 2483 reply(0, "Traffic received: " LLF " byte%s in " LLF " transfer%s", 2484 (LLT)otbi, PLURAL(otbi), 2485 (LLT)total_xfers_in, PLURAL(total_xfers_in)); 2486 reply(0, "Total traffic: " LLF " byte%s in " LLF " transfer%s", 2487 (LLT)otb, PLURAL(otb), 2488 (LLT)total_xfers, PLURAL(total_xfers)); 2489 2490 if (logged_in && !CURCLASS_FLAGS_ISSET(private)) { 2491 struct ftpconv *cp; 2492 2493 reply(0, "%s", ""); 2494 reply(0, "Class: %s, type: %s", 2495 curclass.classname, CURCLASSTYPE); 2496 reply(0, "Check PORT/LPRT commands: %sabled", 2497 CURCLASS_FLAGS_ISSET(checkportcmd) ? "en" : "dis"); 2498 if (! EMPTYSTR(curclass.display)) 2499 reply(0, "Display file: %s", curclass.display); 2500 if (! EMPTYSTR(curclass.notify)) 2501 reply(0, "Notify fileglob: %s", curclass.notify); 2502 reply(0, "Idle timeout: " LLF ", maximum timeout: " LLF, 2503 (LLT)curclass.timeout, (LLT)curclass.maxtimeout); 2504 reply(0, "Current connections: %d", connections); 2505 if (curclass.limit == -1) 2506 reply(0, "Maximum connections: unlimited"); 2507 else 2508 reply(0, "Maximum connections: " LLF, 2509 (LLT)curclass.limit); 2510 if (curclass.limitfile) 2511 reply(0, "Connection limit exceeded message file: %s", 2512 conffilename(curclass.limitfile)); 2513 if (! EMPTYSTR(curclass.chroot)) 2514 reply(0, "Chroot format: %s", curclass.chroot); 2515 reply(0, "Deny bad ftpusers(5) quickly: %sabled", 2516 CURCLASS_FLAGS_ISSET(denyquick) ? "en" : "dis"); 2517 if (! EMPTYSTR(curclass.homedir)) 2518 reply(0, "Homedir format: %s", curclass.homedir); 2519 if (curclass.maxfilesize == -1) 2520 reply(0, "Maximum file size: unlimited"); 2521 else 2522 reply(0, "Maximum file size: " LLF, 2523 (LLT)curclass.maxfilesize); 2524 if (! EMPTYSTR(curclass.motd)) 2525 reply(0, "MotD file: %s", conffilename(curclass.motd)); 2526 reply(0, 2527 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 2528 CURCLASS_FLAGS_ISSET(modify) ? "en" : "dis"); 2529 reply(0, "Upload commands (APPE, STOR, STOU): %sabled", 2530 CURCLASS_FLAGS_ISSET(upload) ? "en" : "dis"); 2531 reply(0, "Sanitize file names: %sabled", 2532 CURCLASS_FLAGS_ISSET(sanenames) ? "en" : "dis"); 2533 reply(0, "PASV/LPSV/EPSV connections: %sabled", 2534 CURCLASS_FLAGS_ISSET(passive) ? "en" : "dis"); 2535 if (curclass.advertise.su_len != 0) { 2536 char buf[50]; /* big enough for IPv6 address */ 2537 const char *bp; 2538 2539 bp = inet_ntop(curclass.advertise.su_family, 2540 (void *)&curclass.advertise.su_addr, 2541 buf, sizeof(buf)); 2542 if (bp != NULL) 2543 reply(0, "PASV advertise address: %s", bp); 2544 } 2545 if (curclass.portmin && curclass.portmax) 2546 reply(0, "PASV port range: " LLF " - " LLF, 2547 (LLT)curclass.portmin, (LLT)curclass.portmax); 2548 if (curclass.rateget) 2549 reply(0, "Rate get limit: " LLF " bytes/sec", 2550 (LLT)curclass.rateget); 2551 else 2552 reply(0, "Rate get limit: disabled"); 2553 if (curclass.rateput) 2554 reply(0, "Rate put limit: " LLF " bytes/sec", 2555 (LLT)curclass.rateput); 2556 else 2557 reply(0, "Rate put limit: disabled"); 2558 if (curclass.mmapsize) 2559 reply(0, "Mmap size: " LLF, (LLT)curclass.mmapsize); 2560 else 2561 reply(0, "Mmap size: disabled"); 2562 if (curclass.readsize) 2563 reply(0, "Read size: " LLF, (LLT)curclass.readsize); 2564 else 2565 reply(0, "Read size: default"); 2566 if (curclass.writesize) 2567 reply(0, "Write size: " LLF, (LLT)curclass.writesize); 2568 else 2569 reply(0, "Write size: default"); 2570 if (curclass.sendbufsize) 2571 reply(0, "Send buffer size: " LLF, 2572 (LLT)curclass.sendbufsize); 2573 else 2574 reply(0, "Send buffer size: default"); 2575 if (curclass.sendlowat) 2576 reply(0, "Send low water mark: " LLF, 2577 (LLT)curclass.sendlowat); 2578 else 2579 reply(0, "Send low water mark: default"); 2580 reply(0, "Umask: %.04o", curclass.umask); 2581 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 2582 if (cp->suffix == NULL || cp->types == NULL || 2583 cp->command == NULL) 2584 continue; 2585 reply(0, "Conversion: %s [%s] disable: %s, command: %s", 2586 cp->suffix, cp->types, cp->disable, cp->command); 2587 } 2588 } 2589 2590 reply(211, "End of status"); 2591 } 2592 2593 void 2594 fatal(const char *s) 2595 { 2596 2597 reply(451, "Error in server: %s\n", s); 2598 reply(221, "Closing connection due to server error."); 2599 dologout(0); 2600 /* NOTREACHED */ 2601 } 2602 2603 /* 2604 * reply() -- 2605 * depending on the value of n, display fmt with a trailing CRLF and 2606 * prefix of: 2607 * n < -1 prefix the message with abs(n) + "-" (initial line) 2608 * n == 0 prefix the message with 4 spaces (middle lines) 2609 * n > 0 prefix the message with n + " " (final line) 2610 */ 2611 void 2612 reply(int n, const char *fmt, ...) 2613 { 2614 char msg[MAXPATHLEN * 2 + 100]; 2615 size_t b; 2616 va_list ap; 2617 2618 b = 0; 2619 if (n == 0) 2620 b = snprintf(msg, sizeof(msg), " "); 2621 else if (n < 0) 2622 b = snprintf(msg, sizeof(msg), "%d-", -n); 2623 else 2624 b = snprintf(msg, sizeof(msg), "%d ", n); 2625 va_start(ap, fmt); 2626 vsnprintf(msg + b, sizeof(msg) - b, fmt, ap); 2627 va_end(ap); 2628 cprintf(stdout, "%s\r\n", msg); 2629 (void)fflush(stdout); 2630 if (debug) 2631 syslog(LOG_DEBUG, "<--- %s", msg); 2632 } 2633 2634 static void 2635 logremotehost(struct sockinet *who) 2636 { 2637 2638 if (getnameinfo((struct sockaddr *)&who->si_su, 2639 who->su_len, remotehost, sizeof(remotehost), NULL, 0, 0)) 2640 strlcpy(remotehost, "?", sizeof(remotehost)); 2641 2642 #if HAVE_SETPROCTITLE 2643 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2644 setproctitle("%s", proctitle); 2645 #endif /* HAVE_SETPROCTITLE */ 2646 if (logging) 2647 syslog(LOG_INFO, "connection from %s to %s", 2648 remotehost, hostname); 2649 } 2650 2651 /* 2652 * Record logout in wtmp file and exit with supplied status. 2653 * NOTE: because this is called from signal handlers it cannot 2654 * use stdio (or call other functions that use stdio). 2655 */ 2656 void 2657 dologout(int status) 2658 { 2659 /* 2660 * Prevent reception of SIGURG from resulting in a resumption 2661 * back to the main program loop. 2662 */ 2663 transflag = 0; 2664 logout_utmp(); 2665 if (logged_in) { 2666 #ifdef KERBEROS 2667 if (!notickets && krbtkfile_env) 2668 unlink(krbtkfile_env); 2669 #endif 2670 } 2671 /* beware of flushing buffers after a SIGPIPE */ 2672 if (xferlogfd != -1) 2673 close(xferlogfd); 2674 _exit(status); 2675 } 2676 2677 void 2678 abor(void) 2679 { 2680 2681 if (!transflag) 2682 return; 2683 tmpline[0] = '\0'; 2684 is_oob = 0; 2685 reply(426, "Transfer aborted. Data connection closed."); 2686 reply(226, "Abort successful"); 2687 transflag = 0; /* flag that the transfer has aborted */ 2688 } 2689 2690 void 2691 statxfer(void) 2692 { 2693 2694 if (!transflag) 2695 return; 2696 tmpline[0] = '\0'; 2697 is_oob = 0; 2698 if (file_size != (off_t) -1) 2699 reply(213, 2700 "Status: " LLF " of " LLF " byte%s transferred", 2701 (LLT)byte_count, (LLT)file_size, 2702 PLURAL(byte_count)); 2703 else 2704 reply(213, "Status: " LLF " byte%s transferred", 2705 (LLT)byte_count, PLURAL(byte_count)); 2706 } 2707 2708 /* 2709 * Call when urgflag != 0 to handle Out Of Band commands. 2710 * Returns non zero if the OOB command aborted the transfer 2711 * by setting transflag to 0. (c.f., "ABOR"). 2712 */ 2713 static int 2714 handleoobcmd() 2715 { 2716 char *cp; 2717 2718 if (!urgflag) 2719 return (0); 2720 urgflag = 0; 2721 /* only process if transfer occurring */ 2722 if (!transflag) 2723 return (0); 2724 cp = tmpline; 2725 if (getline(cp, sizeof(tmpline), stdin) == NULL) { 2726 reply(221, "You could at least say goodbye."); 2727 dologout(0); 2728 } 2729 /* 2730 * Manually parse OOB commands, because we can't 2731 * recursively call the yacc parser... 2732 */ 2733 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2734 abor(); 2735 } else if (strcasecmp(cp, "STAT\r\n") == 0) { 2736 statxfer(); 2737 } else { 2738 /* XXX: error with "500 unknown command" ? */ 2739 } 2740 return (transflag == 0); 2741 } 2742 2743 static int 2744 bind_pasv_addr(void) 2745 { 2746 static int passiveport; 2747 int port, len; 2748 2749 len = pasv_addr.su_len; 2750 if (curclass.portmin == 0 && curclass.portmax == 0) { 2751 pasv_addr.su_port = 0; 2752 return (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len)); 2753 } 2754 2755 if (passiveport == 0) { 2756 srand(getpid()); 2757 passiveport = rand() % (curclass.portmax - curclass.portmin) 2758 + curclass.portmin; 2759 } 2760 2761 port = passiveport; 2762 while (1) { 2763 port++; 2764 if (port > curclass.portmax) 2765 port = curclass.portmin; 2766 else if (port == passiveport) { 2767 errno = EAGAIN; 2768 return (-1); 2769 } 2770 pasv_addr.su_port = htons(port); 2771 if (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len) == 0) 2772 break; 2773 if (errno != EADDRINUSE) 2774 return (-1); 2775 } 2776 passiveport = port; 2777 return (0); 2778 } 2779 2780 /* 2781 * Note: a response of 425 is not mentioned as a possible response to 2782 * the PASV command in RFC959. However, it has been blessed as 2783 * a legitimate response by Jon Postel in a telephone conversation 2784 * with Rick Adams on 25 Jan 89. 2785 */ 2786 void 2787 passive(void) 2788 { 2789 int len; 2790 char *p, *a; 2791 2792 if (pdata >= 0) 2793 close(pdata); 2794 pdata = socket(AF_INET, SOCK_STREAM, 0); 2795 if (pdata < 0 || !logged_in) { 2796 perror_reply(425, "Can't open passive connection"); 2797 return; 2798 } 2799 pasv_addr = ctrl_addr; 2800 2801 if (bind_pasv_addr() < 0) 2802 goto pasv_error; 2803 len = pasv_addr.su_len; 2804 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 2805 goto pasv_error; 2806 pasv_addr.su_len = len; 2807 if (listen(pdata, 1) < 0) 2808 goto pasv_error; 2809 if (curclass.advertise.su_len != 0) 2810 a = (char *) &curclass.advertise.su_addr; 2811 else 2812 a = (char *) &pasv_addr.su_addr; 2813 p = (char *) &pasv_addr.su_port; 2814 2815 #define UC(b) (((int) b) & 0xff) 2816 2817 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2818 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2819 return; 2820 2821 pasv_error: 2822 (void) close(pdata); 2823 pdata = -1; 2824 perror_reply(425, "Can't open passive connection"); 2825 return; 2826 } 2827 2828 /* 2829 * convert protocol identifier to/from AF 2830 */ 2831 int 2832 lpsvproto2af(int proto) 2833 { 2834 2835 switch (proto) { 2836 case 4: 2837 return AF_INET; 2838 #ifdef INET6 2839 case 6: 2840 return AF_INET6; 2841 #endif 2842 default: 2843 return -1; 2844 } 2845 } 2846 2847 int 2848 af2lpsvproto(int af) 2849 { 2850 2851 switch (af) { 2852 case AF_INET: 2853 return 4; 2854 #ifdef INET6 2855 case AF_INET6: 2856 return 6; 2857 #endif 2858 default: 2859 return -1; 2860 } 2861 } 2862 2863 int 2864 epsvproto2af(int proto) 2865 { 2866 2867 switch (proto) { 2868 case 1: 2869 return AF_INET; 2870 #ifdef INET6 2871 case 2: 2872 return AF_INET6; 2873 #endif 2874 default: 2875 return -1; 2876 } 2877 } 2878 2879 int 2880 af2epsvproto(int af) 2881 { 2882 2883 switch (af) { 2884 case AF_INET: 2885 return 1; 2886 #ifdef INET6 2887 case AF_INET6: 2888 return 2; 2889 #endif 2890 default: 2891 return -1; 2892 } 2893 } 2894 2895 /* 2896 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2897 * 229 Entering Extended Passive Mode (|||port|) 2898 */ 2899 void 2900 long_passive(char *cmd, int pf) 2901 { 2902 int len; 2903 char *p, *a; 2904 2905 if (!logged_in) { 2906 syslog(LOG_NOTICE, "long passive but not logged in"); 2907 reply(503, "Login with USER first."); 2908 return; 2909 } 2910 2911 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 2912 /* 2913 * XXX: only EPRT/EPSV ready clients will understand this 2914 */ 2915 if (strcmp(cmd, "EPSV") != 0) 2916 reply(501, "Network protocol mismatch"); /*XXX*/ 2917 else 2918 epsv_protounsupp("Network protocol mismatch"); 2919 2920 return; 2921 } 2922 2923 if (pdata >= 0) 2924 close(pdata); 2925 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2926 if (pdata < 0) { 2927 perror_reply(425, "Can't open passive connection"); 2928 return; 2929 } 2930 pasv_addr = ctrl_addr; 2931 if (bind_pasv_addr() < 0) 2932 goto pasv_error; 2933 len = pasv_addr.su_len; 2934 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 2935 goto pasv_error; 2936 pasv_addr.su_len = len; 2937 if (listen(pdata, 1) < 0) 2938 goto pasv_error; 2939 p = (char *) &pasv_addr.su_port; 2940 2941 #define UC(b) (((int) b) & 0xff) 2942 2943 if (strcmp(cmd, "LPSV") == 0) { 2944 struct sockinet *advert; 2945 2946 if (curclass.advertise.su_len != 0) 2947 advert = &curclass.advertise; 2948 else 2949 advert = &pasv_addr; 2950 switch (advert->su_family) { 2951 case AF_INET: 2952 a = (char *) &advert->su_addr; 2953 reply(228, 2954 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2955 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2956 2, UC(p[0]), UC(p[1])); 2957 return; 2958 #ifdef INET6 2959 case AF_INET6: 2960 a = (char *) &advert->su_6addr; 2961 reply(228, 2962 "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)", 2963 6, 16, 2964 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2965 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2966 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2967 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2968 2, UC(p[0]), UC(p[1])); 2969 return; 2970 #endif 2971 } 2972 #undef UC 2973 } else if (strcmp(cmd, "EPSV") == 0) { 2974 switch (pasv_addr.su_family) { 2975 case AF_INET: 2976 #ifdef INET6 2977 case AF_INET6: 2978 #endif 2979 reply(229, "Entering Extended Passive Mode (|||%d|)", 2980 ntohs(pasv_addr.su_port)); 2981 return; 2982 } 2983 } else { 2984 /* more proper error code? */ 2985 } 2986 2987 pasv_error: 2988 (void) close(pdata); 2989 pdata = -1; 2990 perror_reply(425, "Can't open passive connection"); 2991 return; 2992 } 2993 2994 int 2995 extended_port(const char *arg) 2996 { 2997 char *tmp = NULL; 2998 char *result[3]; 2999 char *p, *q; 3000 char delim; 3001 struct addrinfo hints; 3002 struct addrinfo *res = NULL; 3003 int i; 3004 unsigned long proto; 3005 3006 tmp = xstrdup(arg); 3007 p = tmp; 3008 delim = p[0]; 3009 p++; 3010 memset(result, 0, sizeof(result)); 3011 for (i = 0; i < 3; i++) { 3012 q = strchr(p, delim); 3013 if (!q || *q != delim) 3014 goto parsefail; 3015 *q++ = '\0'; 3016 result[i] = p; 3017 p = q; 3018 } 3019 3020 /* some more sanity checks */ 3021 errno = 0; 3022 p = NULL; 3023 (void)strtoul(result[2], &p, 10); 3024 if (errno || !*result[2] || *p) 3025 goto parsefail; 3026 errno = 0; 3027 p = NULL; 3028 proto = strtoul(result[0], &p, 10); 3029 if (errno || !*result[0] || *p) 3030 goto protounsupp; 3031 3032 memset(&hints, 0, sizeof(hints)); 3033 hints.ai_family = epsvproto2af((int)proto); 3034 if (hints.ai_family < 0) 3035 goto protounsupp; 3036 hints.ai_socktype = SOCK_STREAM; 3037 hints.ai_flags = AI_NUMERICHOST; 3038 if (getaddrinfo(result[1], result[2], &hints, &res)) 3039 goto parsefail; 3040 if (res->ai_next) 3041 goto parsefail; 3042 if (sizeof(data_dest) < res->ai_addrlen) 3043 goto parsefail; 3044 memcpy(&data_dest.si_su, res->ai_addr, res->ai_addrlen); 3045 data_dest.su_len = res->ai_addrlen; 3046 #ifdef INET6 3047 if (his_addr.su_family == AF_INET6 && 3048 data_dest.su_family == AF_INET6) { 3049 /* XXX: more sanity checks! */ 3050 data_dest.su_scope_id = his_addr.su_scope_id; 3051 } 3052 #endif 3053 3054 if (tmp != NULL) 3055 free(tmp); 3056 if (res) 3057 freeaddrinfo(res); 3058 return 0; 3059 3060 parsefail: 3061 reply(500, "Invalid argument, rejected."); 3062 usedefault = 1; 3063 if (tmp != NULL) 3064 free(tmp); 3065 if (res) 3066 freeaddrinfo(res); 3067 return -1; 3068 3069 protounsupp: 3070 epsv_protounsupp("Protocol not supported"); 3071 usedefault = 1; 3072 if (tmp != NULL) 3073 free(tmp); 3074 if (res) 3075 freeaddrinfo(res); 3076 return -1; 3077 } 3078 3079 /* 3080 * 522 Protocol not supported (proto,...) 3081 * as we assume address family for control and data connections are the same, 3082 * we do not return the list of address families we support - instead, we 3083 * return the address family of the control connection. 3084 */ 3085 void 3086 epsv_protounsupp(const char *message) 3087 { 3088 int proto; 3089 3090 proto = af2epsvproto(ctrl_addr.su_family); 3091 if (proto < 0) 3092 reply(501, "%s", message); /* XXX */ 3093 else 3094 reply(522, "%s, use (%d)", message, proto); 3095 } 3096 3097 /* 3098 * Generate unique name for file with basename "local". 3099 * The file named "local" is already known to exist. 3100 * Generates failure reply on error. 3101 * 3102 * XXX: this function should under go changes similar to 3103 * the mktemp(3)/mkstemp(3) changes. 3104 */ 3105 static char * 3106 gunique(const char *local) 3107 { 3108 static char new[MAXPATHLEN]; 3109 struct stat st; 3110 char *cp; 3111 int count; 3112 3113 cp = strrchr(local, '/'); 3114 if (cp) 3115 *cp = '\0'; 3116 if (stat(cp ? local : ".", &st) < 0) { 3117 perror_reply(553, cp ? local : "."); 3118 return (NULL); 3119 } 3120 if (cp) 3121 *cp = '/'; 3122 for (count = 1; count < 100; count++) { 3123 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 3124 if (stat(new, &st) < 0) 3125 return (new); 3126 } 3127 reply(452, "Unique file name cannot be created."); 3128 return (NULL); 3129 } 3130 3131 /* 3132 * Format and send reply containing system error number. 3133 */ 3134 void 3135 perror_reply(int code, const char *string) 3136 { 3137 int save_errno; 3138 3139 save_errno = errno; 3140 reply(code, "%s: %s.", string, strerror(errno)); 3141 errno = save_errno; 3142 } 3143 3144 static char *onefile[] = { 3145 "", 3146 0 3147 }; 3148 3149 void 3150 send_file_list(const char *whichf) 3151 { 3152 struct stat st; 3153 DIR *dirp = NULL; 3154 struct dirent *dir; 3155 FILE *dout = NULL; 3156 char **dirlist, *dirname, *p; 3157 char *notglob = NULL; 3158 int simple = 0; 3159 int freeglob = 0; 3160 glob_t gl; 3161 3162 #ifdef __GNUC__ 3163 (void) &dout; 3164 (void) &dirlist; 3165 (void) &simple; 3166 (void) &freeglob; 3167 #endif 3168 urgflag = 0; 3169 3170 p = NULL; 3171 if (strpbrk(whichf, "~{[*?") != NULL) { 3172 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE|GLOB_LIMIT; 3173 3174 memset(&gl, 0, sizeof(gl)); 3175 freeglob = 1; 3176 if (glob(whichf, flags, 0, &gl)) { 3177 reply(450, "Not found"); 3178 goto cleanup_send_file_list; 3179 } else if (gl.gl_pathc == 0) { 3180 errno = ENOENT; 3181 perror_reply(450, whichf); 3182 goto cleanup_send_file_list; 3183 } 3184 dirlist = gl.gl_pathv; 3185 } else { 3186 notglob = xstrdup(whichf); 3187 onefile[0] = notglob; 3188 dirlist = onefile; 3189 simple = 1; 3190 } 3191 /* XXX: } for vi sm */ 3192 3193 while ((dirname = *dirlist++) != NULL) { 3194 int trailingslash = 0; 3195 3196 if (stat(dirname, &st) < 0) { 3197 /* 3198 * If user typed "ls -l", etc, and the client 3199 * used NLST, do what the user meant. 3200 */ 3201 /* XXX: nuke this support? */ 3202 if (dirname[0] == '-' && *dirlist == NULL && 3203 transflag == 0) { 3204 char *argv[] = { INTERNAL_LS, "", NULL }; 3205 3206 argv[1] = dirname; 3207 retrieve(argv, dirname); 3208 goto cleanup_send_file_list; 3209 } 3210 perror_reply(450, whichf); 3211 goto cleanup_send_file_list; 3212 } 3213 3214 if (S_ISREG(st.st_mode)) { 3215 /* 3216 * XXXRFC: 3217 * should we follow RFC959 and not work 3218 * for non directories? 3219 */ 3220 if (dout == NULL) { 3221 dout = dataconn("file list", (off_t)-1, "w"); 3222 if (dout == NULL) 3223 goto cleanup_send_file_list; 3224 transflag = 1; 3225 } 3226 cprintf(dout, "%s%s\n", dirname, 3227 type == TYPE_A ? "\r" : ""); 3228 continue; 3229 } else if (!S_ISDIR(st.st_mode)) 3230 continue; 3231 3232 if (dirname[strlen(dirname) - 1] == '/') 3233 trailingslash++; 3234 3235 if ((dirp = opendir(dirname)) == NULL) 3236 continue; 3237 3238 while ((dir = readdir(dirp)) != NULL) { 3239 char nbuf[MAXPATHLEN]; 3240 3241 if (urgflag && handleoobcmd()) 3242 goto cleanup_send_file_list; 3243 3244 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 3245 continue; 3246 3247 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 3248 trailingslash ? "" : "/", dir->d_name); 3249 3250 /* 3251 * We have to do a stat to ensure it's 3252 * not a directory or special file. 3253 */ 3254 /* 3255 * XXXRFC: 3256 * should we follow RFC959 and filter out 3257 * non files ? lukem - NO!, or not until 3258 * our ftp client uses MLS{T,D} for completion. 3259 */ 3260 if (simple || (stat(nbuf, &st) == 0 && 3261 S_ISREG(st.st_mode))) { 3262 if (dout == NULL) { 3263 dout = dataconn("file list", (off_t)-1, 3264 "w"); 3265 if (dout == NULL) 3266 goto cleanup_send_file_list; 3267 transflag = 1; 3268 } 3269 p = nbuf; 3270 if (nbuf[0] == '.' && nbuf[1] == '/') 3271 p = &nbuf[2]; 3272 cprintf(dout, "%s%s\n", p, 3273 type == TYPE_A ? "\r" : ""); 3274 } 3275 } 3276 (void) closedir(dirp); 3277 } 3278 3279 if (dout == NULL) 3280 reply(450, "No files found."); 3281 else if (ferror(dout) != 0) 3282 perror_reply(451, "Data connection"); 3283 else 3284 reply(226, "Transfer complete."); 3285 3286 cleanup_send_file_list: 3287 closedataconn(dout); 3288 transflag = 0; 3289 urgflag = 0; 3290 total_xfers++; 3291 total_xfers_out++; 3292 if (notglob) 3293 free(notglob); 3294 if (freeglob) 3295 globfree(&gl); 3296 } 3297 3298 char * 3299 conffilename(const char *s) 3300 { 3301 static char filename[MAXPATHLEN]; 3302 3303 if (*s == '/') 3304 strlcpy(filename, s, sizeof(filename)); 3305 else 3306 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 3307 return (filename); 3308 } 3309 3310 /* 3311 * logxfer -- 3312 * if logging > 1, then based on the arguments, syslog a message: 3313 * if bytes != -1 "<command> <file1> = <bytes> bytes" 3314 * else if file2 != NULL "<command> <file1> <file2>" 3315 * else "<command> <file1>" 3316 * if elapsed != NULL, append "in xxx.yyy seconds" 3317 * if error != NULL, append ": " + error 3318 * 3319 * if doxferlog != 0, bytes != -1, and command is "get", "put", 3320 * or "append", syslog and/or write a wu-ftpd style xferlog entry 3321 */ 3322 void 3323 logxfer(const char *command, off_t bytes, const char *file1, const char *file2, 3324 const struct timeval *elapsed, const char *error) 3325 { 3326 char buf[MAXPATHLEN * 2 + 100]; 3327 char realfile1[MAXPATHLEN], realfile2[MAXPATHLEN]; 3328 const char *r1, *r2; 3329 char direction; 3330 size_t len; 3331 time_t now; 3332 3333 if (logging <=1 && !doxferlog) 3334 return; 3335 3336 r1 = r2 = NULL; 3337 if ((r1 = realpath(file1, realfile1)) == NULL) 3338 r1 = file1; 3339 if (file2 != NULL) 3340 if ((r2 = realpath(file2, realfile2)) == NULL) 3341 r2 = file2; 3342 3343 /* 3344 * syslog command 3345 */ 3346 if (logging > 1) { 3347 len = snprintf(buf, sizeof(buf), "%s %s", command, r1); 3348 if (bytes != (off_t)-1) 3349 len += snprintf(buf + len, sizeof(buf) - len, 3350 " = " LLF " byte%s", (LLT) bytes, PLURAL(bytes)); 3351 else if (r2 != NULL) 3352 len += snprintf(buf + len, sizeof(buf) - len, 3353 " %s", r2); 3354 if (elapsed != NULL) 3355 len += snprintf(buf + len, sizeof(buf) - len, 3356 " in %ld.%.03d seconds", elapsed->tv_sec, 3357 (int)(elapsed->tv_usec / 1000)); 3358 if (error != NULL) 3359 len += snprintf(buf + len, sizeof(buf) - len, 3360 ": %s", error); 3361 syslog(LOG_INFO, "%s", buf); 3362 } 3363 3364 /* 3365 * syslog wu-ftpd style log entry, prefixed with "xferlog: " 3366 */ 3367 if (!doxferlog || bytes == -1) 3368 return; 3369 3370 if (strcmp(command, "get") == 0) 3371 direction = 'o'; 3372 else if (strcmp(command, "put") == 0 || strcmp(command, "append") == 0) 3373 direction = 'i'; 3374 else 3375 return; 3376 3377 time(&now); 3378 len = snprintf(buf, sizeof(buf), 3379 "%.24s %ld %s " LLF " %s %c %s %c %c %s FTP 0 * %c\n", 3380 3381 /* 3382 * XXX: wu-ftpd puts ' (send)' or ' (recv)' in the syslog message, and removes 3383 * the full date. This may be problematic for accurate log parsing, 3384 * given that syslog messages don't contain the full date. 3385 */ 3386 ctime(&now), 3387 elapsed == NULL ? 0 : elapsed->tv_sec + (elapsed->tv_usec > 0), 3388 remotehost, 3389 (LLT) bytes, 3390 r1, 3391 type == TYPE_A ? 'a' : 'b', 3392 "_", /* XXX: take conversions into account? */ 3393 direction, 3394 3395 curclass.type == CLASS_GUEST ? 'a' : 3396 curclass.type == CLASS_CHROOT ? 'g' : 3397 curclass.type == CLASS_REAL ? 'r' : '?', 3398 3399 curclass.type == CLASS_GUEST ? pw->pw_passwd : pw->pw_name, 3400 error != NULL ? 'i' : 'c' 3401 ); 3402 3403 if ((doxferlog & 2) && xferlogfd != -1) 3404 write(xferlogfd, buf, len); 3405 if ((doxferlog & 1)) { 3406 buf[len-1] = '\n'; /* strip \n from syslog message */ 3407 syslog(LOG_INFO, "xferlog: %s", buf); 3408 } 3409 } 3410 3411 /* 3412 * Log the resource usage. 3413 * 3414 * XXX: more resource usage to logging? 3415 */ 3416 void 3417 logrusage(const struct rusage *rusage_before, 3418 const struct rusage *rusage_after) 3419 { 3420 struct timeval usrtime, systime; 3421 3422 if (logging <= 1) 3423 return; 3424 3425 timersub(&rusage_after->ru_utime, &rusage_before->ru_utime, &usrtime); 3426 timersub(&rusage_after->ru_stime, &rusage_before->ru_stime, &systime); 3427 syslog(LOG_INFO, "%ld.%.03du %ld.%.03ds %ld+%ldio %ldpf+%ldw", 3428 usrtime.tv_sec, (int)(usrtime.tv_usec / 1000), 3429 systime.tv_sec, (int)(systime.tv_usec / 1000), 3430 rusage_after->ru_inblock - rusage_before->ru_inblock, 3431 rusage_after->ru_oublock - rusage_before->ru_oublock, 3432 rusage_after->ru_majflt - rusage_before->ru_majflt, 3433 rusage_after->ru_nswap - rusage_before->ru_nswap); 3434 } 3435 3436 /* 3437 * Determine if `password' is valid for user given in `pw'. 3438 * Returns 2 if password expired, 1 if otherwise failed, 0 if ok 3439 */ 3440 int 3441 checkpassword(const struct passwd *pwent, const char *password) 3442 { 3443 char *orig, *new; 3444 time_t change, expire, now; 3445 3446 change = expire = 0; 3447 if (pwent == NULL) 3448 return 1; 3449 3450 time(&now); 3451 orig = pwent->pw_passwd; /* save existing password */ 3452 expire = pwent->pw_expire; 3453 change = (pwent->pw_change == _PASSWORD_CHGNOW)? now : pwent->pw_change; 3454 3455 if (orig[0] == '\0') /* don't allow empty passwords */ 3456 return 1; 3457 3458 new = crypt(password, orig); /* encrypt given password */ 3459 if (strcmp(new, orig) != 0) /* compare */ 3460 return 1; 3461 3462 if ((expire && now >= expire) || (change && now >= change)) 3463 return 2; /* check if expired */ 3464 3465 return 0; /* OK! */ 3466 } 3467 3468 char * 3469 xstrdup(const char *s) 3470 { 3471 char *new = strdup(s); 3472 3473 if (new == NULL) 3474 fatal("Local resource failure: malloc"); 3475 /* NOTREACHED */ 3476 return (new); 3477 } 3478 3479 /* 3480 * As per fprintf(), but increment total_bytes and total_bytes_out, 3481 * by the appropriate amount. 3482 */ 3483 void 3484 cprintf(FILE *fd, const char *fmt, ...) 3485 { 3486 off_t b; 3487 va_list ap; 3488 3489 va_start(ap, fmt); 3490 b = vfprintf(fd, fmt, ap); 3491 va_end(ap); 3492 total_bytes += b; 3493 total_bytes_out += b; 3494 } 3495 3496 #ifdef USE_PAM 3497 /* 3498 * the following code is stolen from imap-uw PAM authentication module and 3499 * login.c 3500 */ 3501 #define COPY_STRING(s) (s ? strdup(s) : NULL) 3502 3503 struct cred_t { 3504 const char *uname; /* user name */ 3505 const char *pass; /* password */ 3506 }; 3507 typedef struct cred_t cred_t; 3508 3509 static int 3510 auth_conv(int num_msg, const struct pam_message **msg, 3511 struct pam_response **resp, void *appdata) 3512 { 3513 int i; 3514 cred_t *cred = (cred_t *) appdata; 3515 struct pam_response *myreply; 3516 3517 myreply = calloc(num_msg, sizeof *myreply); 3518 if (myreply == NULL) 3519 return PAM_BUF_ERR; 3520 3521 for (i = 0; i < num_msg; i++) { 3522 switch (msg[i]->msg_style) { 3523 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 3524 myreply[i].resp_retcode = PAM_SUCCESS; 3525 myreply[i].resp = COPY_STRING(cred->uname); 3526 /* PAM frees resp. */ 3527 break; 3528 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 3529 myreply[i].resp_retcode = PAM_SUCCESS; 3530 myreply[i].resp = COPY_STRING(cred->pass); 3531 /* PAM frees resp. */ 3532 break; 3533 case PAM_TEXT_INFO: 3534 case PAM_ERROR_MSG: 3535 myreply[i].resp_retcode = PAM_SUCCESS; 3536 myreply[i].resp = NULL; 3537 break; 3538 default: /* unknown message style */ 3539 free(myreply); 3540 return PAM_CONV_ERR; 3541 } 3542 } 3543 3544 *resp = myreply; 3545 return PAM_SUCCESS; 3546 } 3547 3548 /* 3549 * Attempt to authenticate the user using PAM. Returns 0 if the user is 3550 * authenticated, or 1 if not authenticated. If some sort of PAM system 3551 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 3552 * function returns -1. This can be used as an indication that we should 3553 * fall back to a different authentication mechanism. 3554 */ 3555 static int 3556 auth_pam(struct passwd **ppw, const char *pwstr) 3557 { 3558 const char *tmpl_user; 3559 const void *item; 3560 int rval; 3561 int e; 3562 cred_t auth_cred = { (*ppw)->pw_name, pwstr }; 3563 struct pam_conv conv = { &auth_conv, &auth_cred }; 3564 3565 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 3566 if (e != PAM_SUCCESS) { 3567 /* 3568 * In OpenPAM, it's OK to pass NULL to pam_strerror() 3569 * if context creation has failed in the first place. 3570 */ 3571 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 3572 return -1; 3573 } 3574 3575 e = pam_set_item(pamh, PAM_RHOST, remotehost); 3576 if (e != PAM_SUCCESS) { 3577 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 3578 pam_strerror(pamh, e)); 3579 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 3580 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 3581 } 3582 pamh = NULL; 3583 return -1; 3584 } 3585 3586 e = pam_authenticate(pamh, 0); 3587 switch (e) { 3588 case PAM_SUCCESS: 3589 /* 3590 * With PAM we support the concept of a "template" 3591 * user. The user enters a login name which is 3592 * authenticated by PAM, usually via a remote service 3593 * such as RADIUS or TACACS+. If authentication 3594 * succeeds, a different but related "template" name 3595 * is used for setting the credentials, shell, and 3596 * home directory. The name the user enters need only 3597 * exist on the remote authentication server, but the 3598 * template name must be present in the local password 3599 * database. 3600 * 3601 * This is supported by two various mechanisms in the 3602 * individual modules. However, from the application's 3603 * point of view, the template user is always passed 3604 * back as a changed value of the PAM_USER item. 3605 */ 3606 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 3607 PAM_SUCCESS) { 3608 tmpl_user = (const char *) item; 3609 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 3610 *ppw = sgetpwnam(tmpl_user); 3611 } else 3612 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 3613 pam_strerror(pamh, e)); 3614 rval = 0; 3615 break; 3616 3617 case PAM_AUTH_ERR: 3618 case PAM_USER_UNKNOWN: 3619 case PAM_MAXTRIES: 3620 rval = 1; 3621 break; 3622 3623 default: 3624 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 3625 rval = -1; 3626 break; 3627 } 3628 3629 if (rval == 0) { 3630 e = pam_acct_mgmt(pamh, 0); 3631 if (e != PAM_SUCCESS) { 3632 syslog(LOG_ERR, "pam_acct_mgmt: %s", 3633 pam_strerror(pamh, e)); 3634 rval = 1; 3635 } 3636 } 3637 3638 if (rval != 0) { 3639 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 3640 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 3641 } 3642 pamh = NULL; 3643 } 3644 return rval; 3645 } 3646 3647 #endif /* USE_PAM */ 3648
Indexes created Tue Oct 14 08:09:56 GMT 2025