/* * CDE - Common Desktop Environment * * Copyright (c) 1993-2012, The Open Group. All rights reserved. * * These libraries and programs are free software; you can * redistribute them and/or modify them under the terms of the GNU * Lesser General Public License as published by the Free Software * Foundation; either version 2 of the License, or (at your option) * any later version. * * These libraries and programs are distributed in the hope that * they will be useful, but WITHOUT ANY WARRANTY; without even the * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR * PURPOSE. See the GNU Lesser General Public License for more * details. * * You should have received a copy of the GNU Lesser General Public * License along with these librararies and programs; if not, write * to the Free Software Foundation, Inc., 51 Franklin Street, Fifth * Floor, Boston, MA 02110-1301 USA */ /* $TOG: genauth.c /main/6 1997/03/25 12:33:13 barstow $ */ /* (c) Copyright 1997, The Open Group */ /* * * (c) Copyright 1993, 1994 Hewlett-Packard Company * * (c) Copyright 1993, 1994 International Business Machines Corp. * * (c) Copyright 1993, 1994 Sun Microsystems, Inc. * * (c) Copyright 1993, 1994 Novell, Inc. * */ /* * @DEC_COPYRIGHT@ */ /* * HISTORY * $Log$ * Revision 1.1.2.2 1995/04/21 13:05:23 Peter_Derr * dtlogin auth key fixes from deltacde * [1995/04/14 18:03:41 Peter_Derr] * * R6 xdm code used in dtlogin. * [1995/04/10 16:52:31 Peter_Derr] * * Revision 1.1.3.3 1995/02/20 21:03:19 Peter_Derr * merge XC fix-11 * [1995/02/20 20:13:02 Peter_Derr] * * Revision 1.1.3.2 1994/07/13 19:26:25 Peter_Derr * Include Wrap.h to get definitions for XDM-AUTHENTICATION-1 * authorization mechanism. * [1994/07/13 12:15:59 Peter_Derr] * * $EndLog$ */ #ifndef lint static char *rcsid = "@(#)$RCSfile: genauth.c $ $Revision: /main/6 $ (DEC) $Date: 1997/03/25 12:33:13 $"; #endif /* Copyright (c) 1988 X Consortium Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of the X Consortium shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from the X Consortium. */ /* * xdm - display manager daemon * Author: Keith Packard, MIT X Consortium */ # include # include # include "dm.h" #include #ifdef X_NOT_STDC_ENV #define Time_t long extern Time_t time (); extern int errno; #else #include #define Time_t time_t #endif #ifndef DONT_USE_DES # ifndef USE_CRYPT # ifdef AIXV3 # define USE_CRYPT # endif # ifdef ultrix # define USE_CRYPT # endif # ifdef hpux # define USE_CRYPT # endif # ifdef macII # define USE_CRYPT # endif # ifdef sun # define USE_CRYPT # if (OSMAJORVERSION >= 4) /* avoid strange sun crypt hackery */ # define crypt _crypt # endif # endif # endif #endif #if !defined (DONT_USE_DES) && !defined (USE_CRYPT) # define USE_ENCRYPT #endif #ifdef HASXDMAUTH static unsigned char key[8]; #else static long key[2]; #endif static sumFile (char *name, long sum[2]); #ifdef HASXDMAUTH typedef unsigned char auth_cblock[8]; /* block size */ typedef struct auth_ks_struct { auth_cblock _; } auth_wrapper_schedule[16]; extern void _XdmcpWrapperToOddParity(); static longtochars (l, c) long l; unsigned char *c; { c[0] = (l >> 24) & 0xff; c[1] = (l >> 16) & 0xff; c[2] = (l >> 8) & 0xff; c[3] = l & 0xff; } static InitXdmcpWrapper () { long sum[2]; unsigned char tmpkey[8]; /* * randomFile is and xdm resource not defined in dtlogin. * * if (!sumFile (randomFile, sum)) { */ if (!sumFile ("/dev/mem", sum)) { sum[0] = time ((Time_t *) 0); sum[1] = time ((Time_t *) 0); } longtochars (sum[0], tmpkey+0); longtochars (sum[1], tmpkey+4); tmpkey[0] = 0; _XdmcpWrapperToOddParity (tmpkey, key); } #endif /* HASXDMAUTH */ #ifndef HASXDMAUTH /* A random number generator that is more unpredictable than that shipped with some systems. This code is taken from the C standard. */ static unsigned long int next = 1; static int xdm_rand() { next = next * 1103515245 + 12345; return (unsigned int)(next/65536) % 32768; } static void xdm_srand(seed) unsigned int seed; { next = seed; } #endif /* no HASXDMAUTH */ #ifdef USE_ENCRYPT static bitsToBytes (bits, bytes) unsigned long bits[2]; char bytes[64]; { int bit, byte; int i; i = 0; for (byte = 0; byte < 2; byte++) for (bit = 0; bit < 32; bit++) bytes[i++] = ((bits[byte] & (1 << bit)) != 0); } #endif /* USE_ENCRYPT */ # define FILE_LIMIT 1024 /* no more than this many buffers */ /* for linux/csrg we use a simpler method to get 2 random longs from * the OS's random number device. */ #if defined(linux) || defined(CSRG_BASED) #define READ_LIMIT (sizeof (long) * 2) static sumFile (char *name, long sum[2]) { long buf[2]; int fd; int ret_status = 0; if ( (fd = open (name, 0)) < 0 ) { LogError((unsigned char *) "Cannot open randomFile \"%s\", errno = %d\n", name, errno); return 0; } sum[0] = 0; sum[1] = 0; if (read(fd, (char *)buf, READ_LIMIT) != READ_LIMIT) { LogError((unsigned char *) "Could not read %d bytes from '%s'\n", READ_LIMIT, name); /* cheap fallback */ sum[0] = (long)time((Time_t *) 0); sum[1] = sum[0]; } else { sum[0] = buf[0]; sum[1] = buf[1]; ret_status = 1; } close(fd); return ret_status; } #undef READ_LIMIT #else /* linux || CSRG_BASED */ static sumFile (name, sum) char *name; long sum[2]; { long buf[1024*2]; int cnt; int fd; int loops; int reads; int i; int ret_status = 0; fd = open (name, 0); if (fd < 0) { LogError((unsigned char *) "Cannot open randomFile \"%s\", errno = %d\n", name, errno); return 0; } #ifdef FRAGILE_DEV_MEM if (strcmp(name, "/dev/mem") == 0) lseek (fd, (off_t) 0x100000, SEEK_SET); #endif reads = FILE_LIMIT; sum[0] = 0; sum[1] = 0; while ((cnt = read (fd, (char *) buf, sizeof (buf))) > 0 && --reads > 0) { loops = cnt / (2 * sizeof (long)); for (i = 0; i < loops; i+= 2) { sum[0] += buf[i]; sum[1] += buf[i+1]; ret_status = 1; } } if (cnt < 0) LogError((unsigned char *) "Cannot read randomFile \"%s\", errno = %d\n", name, errno); close (fd); return ret_status; } #endif /* linux || CSRG_BASED */ GenerateAuthData (auth, len) char *auth; int len; { long ldata[2]; #ifdef ITIMER_REAL { struct timeval now; X_GETTIMEOFDAY (&now); ldata[0] = now.tv_sec; ldata[1] = now.tv_usec; } #else { long time (); ldata[0] = time ((long *) 0); ldata[1] = getpid (); } #endif /* ITIMER_REAL */ #ifdef HASXDMAUTH { int bit; int i; auth_wrapper_schedule schedule; unsigned char tdata[8]; static int xdmcpAuthInited; longtochars (ldata[0], tdata+0); longtochars (ldata[1], tdata+4); if (!xdmcpAuthInited) { InitXdmcpWrapper (); xdmcpAuthInited = 1; } _XdmcpAuthSetup (key, schedule); for (i = 0; i < len; i++) { auth[i] = 0; for (bit = 1; bit < 256; bit <<= 1) { _XdmcpAuthDoIt (tdata, tdata, schedule, 1); if (tdata[0] + tdata[1] & 0x4) auth[i] |= bit; } } } #else InitCryptoKey (); #if defined(USE_CRYPT) { int i, j, k; char *result, *crypt (); char cdata[9]; long sdata; for (j = 0; j < 2; j++) { sdata = ldata[j]; for (i = 0; i < 4; i++) { k = j * 4 + i; cdata[k] = sdata & 0xff; if (cdata[k] == 0) cdata[k] = 1; sdata >>= 8; } } cdata[8] = '\0'; for (i = 0; i < len; i += 4) { result = crypt (cdata, (const char *) key); k = 4; if (i + k > len) k = len - i; for (j = 0; j < k; j++) auth[i + j] = result[2 + j]; for (j = 0; j < 8; j++) cdata[j] = result[2 + j]; } } #elif defined(USE_ENCRYPT) { char key_bits[64]; char data_bits[64]; int bit; int i; bitsToBytes (key, key_bits); bitsToBytes (ldata, data_bits); setkey (key_bits); for (i = 0; i < len; i++) { auth[i] = 0; for (bit = 1; bit < 256; bit <<= 1) { encrypt (data_bits, 0); if (data_bits[bit]) auth[i] |= bit; } } } #else { int seed; int value; int i; seed = (ldata[0] + key[0]) + ((ldata[1] + key[1]) << 16); xdm_srand (seed); for (i = 0; i < len; i++) { value = xdm_rand (); auth[i] = (value & 0xff00) >> 8; } value = len; if (value > sizeof (key)) value = sizeof (key); memmove( (char *) key, auth, value); } #endif #endif } #ifndef HASXDMAUTH static int cryptoInited = 0; int InitCryptoKey( void ) { #if defined(linux) /* non-blocking */ char *key_file = "/dev/urandom"; #elif defined(CSRG_BASED) /* non-blocking */ char *key_file = "/dev/random"; #else # warning "Using /dev/mem for random bits." /* JET - this seems like a really bad idea. */ char *key_file = "/dev/mem"; #endif if (cryptoInited) return; /* * If the sumFile fails to produce a result * use the time of day. */ if (!sumFile (key_file, key)) { #ifdef ITIMER_REAL { struct timeval now; struct timezone zone; gettimeofday (&now, &zone); key[0] = now.tv_sec; key[1] = now.tv_usec; } #else { long time (); key[0] = time ((long *) 0); key[1] = getpid (); } #endif } cryptoInited = 1; } #endif /* HASXDMAUTH */