/* $XdotOrg: xc/programs/xdm/genauth.c,v 1.1.4.5 2003/12/20 00:28:31 kaleb Exp $ */ /* $Xorg: genauth.c,v 1.5 2001/02/09 02:05:40 xorgcvs Exp $ */ /* Copyright 1988, 1998 The Open Group Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. 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 OPEN GROUP 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 Open Group 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 Open Group. */ /* $XFree86: xc/programs/xdm/genauth.c,v 3.23 2003/12/20 19:45:12 dawes Exp $ */ /* * xdm - display manager daemon * Author: Keith Packard, MIT X Consortium */ # include # include # include "dm.h" # include "dm_auth.h" # include "dm_error.h" #include #include #define Time_t time_t #ifdef HASXDMAUTH static unsigned char key[8]; #endif #ifdef DEV_RANDOM extern char *randomDevice; #endif #ifdef HASXDMAUTH typedef unsigned char auth_cblock[8]; /* block size */ typedef struct auth_ks_struct { auth_cblock _; } auth_wrapper_schedule[16]; extern int _XdmcpAuthSetup(unsigned char *, auth_wrapper_schedule); extern int _XdmcpAuthDoIt(unsigned char *, unsigned char *, auth_wrapper_schedule, int); extern void _XdmcpWrapperToOddParity(unsigned char *, unsigned char *); static void longtochars (long l, unsigned char *c) { c[0] = (l >> 24) & 0xff; c[1] = (l >> 16) & 0xff; c[2] = (l >> 8) & 0xff; c[3] = l & 0xff; } #endif #ifdef POLL_DEV_RANDOM #include static int pollRandomDevice (int fd) { struct pollfd fds; fds.fd = fd; fds.events = POLLIN | POLLRDNORM; /* Wait up to 5 seconds for entropy to accumulate */ return poll(&fds, 1, 5000); } #else #define pollRandomDevice(fd) 1 #endif #if !defined(ARC4_RANDOM) /* ####################################################################### */ /* * Copyright Theodore Ts'o, 1994, 1995, 1996, 1997, 1998, 1999. All * rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, and the entire permission notice in its entirety, * including the disclaimer of warranties. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote * products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF * WHICH ARE HEREBY DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. */ static CARD32 epool[32], erotate, eadd_ptr; static void add_entropy (const CARD32 *in, int nwords) { static const CARD32 twist_table[8] = { 0, 0x3b6e20c8, 0x76dc4190, 0x4db26158, 0xedb88320, 0xd6d6a3e8, 0x9b64c2b0, 0xa00ae278 }; CARD32 i, w; int new_rotate; while (nwords--) { w = *in++; w = (w<>(32-erotate)) & 0xffffffff; i = eadd_ptr = (eadd_ptr - 1) & 31; new_rotate = erotate + 14; if (i) new_rotate = erotate + 7; erotate = new_rotate & 31; w ^= epool[(i + 26) & 31]; w ^= epool[(i + 20) & 31]; w ^= epool[(i + 14) & 31]; w ^= epool[(i + 7) & 31]; w ^= epool[(i + 1) & 31]; w ^= epool[i]; epool[i] = (w >> 3) ^ twist_table[w & 7]; } } /* ####################################################################### */ /* * This code implements something close to the MD5 message-digest * algorithm. This code is based on code written by Colin Plumb * in 1993, no copyright is claimed. * This code is in the public domain; do with it what you wish. */ /* The four core functions - F1 is optimized somewhat */ #define F1(x, y, z) (z ^ (x & (y ^ z))) #define F2(x, y, z) F1 (z, x, y) #define F3(x, y, z) (x ^ y ^ z) #define F4(x, y, z) (y ^ (x | ~z)) /* This is the central step in the MD5 algorithm. */ #define pmd5_step(f, w, x, y, z, data, s) \ ( w += (f(x, y, z) + data) & 0xffffffff, w = w<>(32-s), w += x ) /* * The core of the MD5 algorithm, this alters an existing MD5 hash to * reflect the addition of 16 longwords of new data. */ static void pmd5_hash (CARD32 *out, const CARD32 in[16]) { CARD32 a, b, c, d; a = out[0]; b = out[1]; c = out[2]; d = out[3]; pmd5_step(F1, a, b, c, d, in[0] + 0xd76aa478, 7); pmd5_step(F1, d, a, b, c, in[1] + 0xe8c7b756, 12); pmd5_step(F1, c, d, a, b, in[2] + 0x242070db, 17); pmd5_step(F1, b, c, d, a, in[3] + 0xc1bdceee, 22); pmd5_step(F1, a, b, c, d, in[4] + 0xf57c0faf, 7); pmd5_step(F1, d, a, b, c, in[5] + 0x4787c62a, 12); pmd5_step(F1, c, d, a, b, in[6] + 0xa8304613, 17); pmd5_step(F1, b, c, d, a, in[7] + 0xfd469501, 22); pmd5_step(F1, a, b, c, d, in[8] + 0x698098d8, 7); pmd5_step(F1, d, a, b, c, in[9] + 0x8b44f7af, 12); pmd5_step(F1, c, d, a, b, in[10] + 0xffff5bb1, 17); pmd5_step(F1, b, c, d, a, in[11] + 0x895cd7be, 22); pmd5_step(F1, a, b, c, d, in[12] + 0x6b901122, 7); pmd5_step(F1, d, a, b, c, in[13] + 0xfd987193, 12); pmd5_step(F1, c, d, a, b, in[14] + 0xa679438e, 17); pmd5_step(F1, b, c, d, a, in[15] + 0x49b40821, 22); pmd5_step(F2, a, b, c, d, in[1] + 0xf61e2562, 5); pmd5_step(F2, d, a, b, c, in[6] + 0xc040b340, 9); pmd5_step(F2, c, d, a, b, in[11] + 0x265e5a51, 14); pmd5_step(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20); pmd5_step(F2, a, b, c, d, in[5] + 0xd62f105d, 5); pmd5_step(F2, d, a, b, c, in[10] + 0x02441453, 9); pmd5_step(F2, c, d, a, b, in[15] + 0xd8a1e681, 14); pmd5_step(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20); pmd5_step(F2, a, b, c, d, in[9] + 0x21e1cde6, 5); pmd5_step(F2, d, a, b, c, in[14] + 0xc33707d6, 9); pmd5_step(F2, c, d, a, b, in[3] + 0xf4d50d87, 14); pmd5_step(F2, b, c, d, a, in[8] + 0x455a14ed, 20); pmd5_step(F2, a, b, c, d, in[13] + 0xa9e3e905, 5); pmd5_step(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9); pmd5_step(F2, c, d, a, b, in[7] + 0x676f02d9, 14); pmd5_step(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20); pmd5_step(F3, a, b, c, d, in[5] + 0xfffa3942, 4); pmd5_step(F3, d, a, b, c, in[8] + 0x8771f681, 11); pmd5_step(F3, c, d, a, b, in[11] + 0x6d9d6122, 16); pmd5_step(F3, b, c, d, a, in[14] + 0xfde5380c, 23); pmd5_step(F3, a, b, c, d, in[1] + 0xa4beea44, 4); pmd5_step(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11); pmd5_step(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16); pmd5_step(F3, b, c, d, a, in[10] + 0xbebfbc70, 23); pmd5_step(F3, a, b, c, d, in[13] + 0x289b7ec6, 4); pmd5_step(F3, d, a, b, c, in[0] + 0xeaa127fa, 11); pmd5_step(F3, c, d, a, b, in[3] + 0xd4ef3085, 16); pmd5_step(F3, b, c, d, a, in[6] + 0x04881d05, 23); pmd5_step(F3, a, b, c, d, in[9] + 0xd9d4d039, 4); pmd5_step(F3, d, a, b, c, in[12] + 0xe6db99e5, 11); pmd5_step(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16); pmd5_step(F3, b, c, d, a, in[2] + 0xc4ac5665, 23); pmd5_step(F4, a, b, c, d, in[0] + 0xf4292244, 6); pmd5_step(F4, d, a, b, c, in[7] + 0x432aff97, 10); pmd5_step(F4, c, d, a, b, in[14] + 0xab9423a7, 15); pmd5_step(F4, b, c, d, a, in[5] + 0xfc93a039, 21); pmd5_step(F4, a, b, c, d, in[12] + 0x655b59c3, 6); pmd5_step(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10); pmd5_step(F4, c, d, a, b, in[10] + 0xffeff47d, 15); pmd5_step(F4, b, c, d, a, in[1] + 0x85845dd1, 21); pmd5_step(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6); pmd5_step(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10); pmd5_step(F4, c, d, a, b, in[6] + 0xa3014314, 15); pmd5_step(F4, b, c, d, a, in[13] + 0x4e0811a1, 21); pmd5_step(F4, a, b, c, d, in[4] + 0xf7537e82, 6); pmd5_step(F4, d, a, b, c, in[11] + 0xbd3af235, 10); pmd5_step(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15); pmd5_step(F4, b, c, d, a, in[9] + 0xeb86d391, 21); out[0] += a; out[1] += b; out[2] += c; out[3] += d; } /* ####################################################################### */ static int sumFile (const char *name, int len, int whence, off_t offset) { int fd, cnt, readlen = 0; unsigned char buf[0x1000]; if ((fd = open (name, O_RDONLY)) < 0) { Debug("cannot open entropy source \"%s\", errno=%d\n", name, errno); return -1; } lseek (fd, offset, whence); while (readlen < len) { if (!(cnt = read (fd, buf, sizeof (buf)))) break; if (cnt < 0) { close (fd); Debug("cannot read entropy source \"%s\", errno=%d\n", name, errno); return -1; } readlen += cnt; add_entropy((CARD32 *)buf, (cnt + 3) / 4); } close (fd); Debug("read %d bytes from entropy source \"%s\"\n", readlen, name); return readlen; } void AddTimerEntropy (void) { struct timeval now; X_GETTIMEOFDAY (&now); add_entropy((CARD32 *)&now, sizeof(now)/sizeof(CARD32)); } #define BSIZ 0x10000 void AddOtherEntropy (void) { AddTimerEntropy(); /* XXX -- setup-specific ... use some common ones */ sumFile ("/var/log/messages", 0x1000, SEEK_END, -0x1000); sumFile ("/var/log/syslog", 0x1000, SEEK_END, -0x1000); sumFile ("/var/log/debug", 0x1000, SEEK_END, -0x1000); sumFile ("/var/log/kern.log", 0x1000, SEEK_END, -0x1000); sumFile ("/var/log/daemon.log", 0x1000, SEEK_END, -0x1000); } void AddPreGetEntropy (void) { static off_t offset; off_t readlen; AddTimerEntropy(); if ((readlen = sumFile (randomFile, BSIZ, SEEK_SET, offset)) == BSIZ) { offset += readlen; #ifdef FRAGILE_DEV_MEM if (!strcmp (randomFile, "/dev/mem")) { if (offset == 0xa0000) /* skip 640kB-1MB ROM mappings */ offset = 0x100000; else if (offset == 0xf00000) /* skip 15-16MB memory hole */ offset = 0x1000000; } #endif return; } else if (readlen >= 0 && offset) { if ((offset = sumFile (randomFile, BSIZ, SEEK_SET, 0)) == BSIZ) return; } LogError("Cannot read randomFile \"%s\"; X cookies may be easily guessable\n", randomFile); } #endif /* !ARC4_RANDOM && !DEV_RANDOM */ #ifdef HASXDMAUTH static void InitXdmcpWrapper (void) { CARD32 sum[4]; #ifdef ARC4_RANDOM sum[0] = arc4random(); sum[1] = arc4random(); *(u_char *)sum = 0; _XdmcpWrapperToOddParity((unsigned char *)sum, key); #else unsigned char tmpkey[8]; #ifdef DEV_RANDOM int fd; if ((fd = open(randomDevice, O_RDONLY)) >= 0) { if (pollRandomDevice(fd) && read(fd, tmpkey, 8) == 8) { tmpkey[0] = 0; _XdmcpWrapperToOddParity(tmpkey, key); close(fd); return; } else { close(fd); } } else { LogError("Cannot open randomDevice \"%s\", errno = %d\n", randomDevice, errno); } #endif /* Try some pseudo-random number genrator daemon next */ if (prngdSocket != NULL || prngdPort != 0) { if (get_prngd_bytes(tmpkey, sizeof(tmpkey), prngdPort, prngdSocket) == 0) { tmpkey[0] = 0; _XdmcpWrapperToOddParity(tmpkey, key); return; } } /* Fall back if no other source of random number was found */ AddPreGetEntropy(); pmd5_hash (sum, epool); add_entropy (sum, 1); pmd5_hash (sum, epool + 16); add_entropy (sum + 2, 1); longtochars (sum[0], tmpkey+0); longtochars (sum[1], tmpkey+4); tmpkey[0] = 0; _XdmcpWrapperToOddParity (tmpkey, key); #endif } #endif int GenerateAuthData (char *auth, int len) { #ifdef HASXDMAUTH int i, bit; auth_wrapper_schedule schedule; unsigned char data[8]; static int xdmcpAuthInited; long ldata[2]; #ifdef ITIMER_REAL struct timeval now; X_GETTIMEOFDAY (&now); ldata[0] = now.tv_usec; ldata[1] = now.tv_sec; #else ldata[0] = time ((long *) 0); ldata[1] = getpid (); #endif longtochars (ldata[0], data+0); longtochars (ldata[1], data+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 (data, data, schedule, 1); if ((data[0] + data[1]) & 0x4) auth[i] |= bit; } } return 1; #else /* !XDMAUTH */ #ifdef ARC4_RANDOM CARD32 *rnd = (CARD32 *)auth; int i; for (i = 0; i < len; i += 4) rnd[i / 4] = arc4random(); return 1; #else /* !ARC4_RANDOM */ CARD32 tmp[4] = { 0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476 }; #ifdef DEV_RANDOM int fd; if ((fd = open(randomDevice, O_RDONLY)) >= 0) { if (pollRandomDevice(fd) && read(fd, auth, len) == len) { close(fd); return 1; } close(fd); LogError("Cannot read randomDevice \"%s\", errno=%d\n", randomDevice, errno); } else LogError("Cannot open randomDevice \"%s\", errno = %d\n", randomDevice, errno); #endif /* DEV_RANDOM */ /* Try some pseudo-random number genrator daemon next */ if (prngdSocket != NULL || prngdPort != 0) { if (get_prngd_bytes(auth, len, prngdPort, prngdSocket) == 0) { return 1; } } /* Fallback if not able to get from /dev/random */ AddPreGetEntropy(); pmd5_hash (tmp, epool); add_entropy (tmp, 1); pmd5_hash (tmp, epool + 16); add_entropy (tmp + 2, 1); memcpy (auth, tmp, len); return 1; #endif /* !ARC4_RANDOM */ #endif /* !HASXDMAUTH */ }