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422 lines
12 KiB
C
422 lines
12 KiB
C
/*
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Unix SMB/CIFS implementation.
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a partial implementation of DES designed for use in the
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SMB authentication protocol
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Copyright (C) Andrew Tridgell 1998
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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/* NOTES:
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This code makes no attempt to be fast! In fact, it is a very
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slow implementation
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This code is NOT a complete DES implementation. It implements only
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the minimum necessary for SMB authentication, as used by all SMB
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products (including every copy of Microsoft Windows95 ever sold)
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In particular, it can only do a unchained forward DES pass. This
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means it is not possible to use this code for encryption/decryption
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of data, instead it is only useful as a "hash" algorithm.
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There is no entry point into this code that allows normal DES operation.
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I believe this means that this code does not come under ITAR
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regulations but this is NOT a legal opinion. If you are concerned
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about the applicability of ITAR regulations to this code then you
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should confirm it for yourself (and maybe let me know if you come
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up with a different answer to the one above)
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*/
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#define uchar unsigned char
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static const uchar perm1[56] = {57, 49, 41, 33, 25, 17, 9,
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1, 58, 50, 42, 34, 26, 18,
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10, 2, 59, 51, 43, 35, 27,
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19, 11, 3, 60, 52, 44, 36,
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63, 55, 47, 39, 31, 23, 15,
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7, 62, 54, 46, 38, 30, 22,
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14, 6, 61, 53, 45, 37, 29,
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21, 13, 5, 28, 20, 12, 4};
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static const uchar perm2[48] = {14, 17, 11, 24, 1, 5,
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3, 28, 15, 6, 21, 10,
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23, 19, 12, 4, 26, 8,
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16, 7, 27, 20, 13, 2,
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41, 52, 31, 37, 47, 55,
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30, 40, 51, 45, 33, 48,
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44, 49, 39, 56, 34, 53,
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46, 42, 50, 36, 29, 32};
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static const uchar perm3[64] = {58, 50, 42, 34, 26, 18, 10, 2,
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60, 52, 44, 36, 28, 20, 12, 4,
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62, 54, 46, 38, 30, 22, 14, 6,
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64, 56, 48, 40, 32, 24, 16, 8,
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57, 49, 41, 33, 25, 17, 9, 1,
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59, 51, 43, 35, 27, 19, 11, 3,
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61, 53, 45, 37, 29, 21, 13, 5,
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63, 55, 47, 39, 31, 23, 15, 7};
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static const uchar perm4[48] = { 32, 1, 2, 3, 4, 5,
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4, 5, 6, 7, 8, 9,
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8, 9, 10, 11, 12, 13,
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12, 13, 14, 15, 16, 17,
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16, 17, 18, 19, 20, 21,
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20, 21, 22, 23, 24, 25,
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24, 25, 26, 27, 28, 29,
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28, 29, 30, 31, 32, 1};
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static const uchar perm5[32] = { 16, 7, 20, 21,
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29, 12, 28, 17,
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1, 15, 23, 26,
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5, 18, 31, 10,
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2, 8, 24, 14,
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32, 27, 3, 9,
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19, 13, 30, 6,
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22, 11, 4, 25};
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static const uchar perm6[64] ={ 40, 8, 48, 16, 56, 24, 64, 32,
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39, 7, 47, 15, 55, 23, 63, 31,
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38, 6, 46, 14, 54, 22, 62, 30,
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37, 5, 45, 13, 53, 21, 61, 29,
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36, 4, 44, 12, 52, 20, 60, 28,
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35, 3, 43, 11, 51, 19, 59, 27,
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34, 2, 42, 10, 50, 18, 58, 26,
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33, 1, 41, 9, 49, 17, 57, 25};
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static const uchar sc[16] = {1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1};
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static const uchar sbox[8][4][16] = {
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{{14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7},
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{0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8},
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{4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0},
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{15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13}},
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{{15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10},
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{3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5},
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{0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15},
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{13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9}},
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{{10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8},
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{13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1},
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{13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7},
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{1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12}},
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{{7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15},
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{13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9},
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{10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4},
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{3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14}},
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{{2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9},
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{14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6},
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{4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14},
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{11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3}},
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{{12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11},
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{10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8},
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{9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6},
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{4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13}},
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{{4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1},
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{13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6},
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{1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2},
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{6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12}},
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{{13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7},
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{1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2},
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{7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8},
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{2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11}}};
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static void permute(char *out, const char *in, const uchar *p, int n)
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{
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int i;
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for (i=0;i<n;i++)
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out[i] = in[p[i]-1];
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}
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static void lshift(char *d, int count, int n)
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{
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char out[64];
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int i;
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for (i=0;i<n;i++)
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out[i] = d[(i+count)%n];
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for (i=0;i<n;i++)
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d[i] = out[i];
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}
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static void concat(char *out, char *in1, char *in2, int l1, int l2)
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{
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while (l1--)
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*out++ = *in1++;
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while (l2--)
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*out++ = *in2++;
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}
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static void x_or(char *out, char *in1, char *in2, int n)
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{
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int i;
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for (i=0;i<n;i++)
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out[i] = in1[i] ^ in2[i];
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}
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static void dohash(char *out, char *in, char *key, int forw)
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{
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int i, j, k;
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char pk1[56];
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char c[28];
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char d[28];
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char cd[56];
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char ki[16][48];
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char pd1[64];
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char l[32], r[32];
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char rl[64];
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permute(pk1, key, perm1, 56);
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for (i=0;i<28;i++)
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c[i] = pk1[i];
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for (i=0;i<28;i++)
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d[i] = pk1[i+28];
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for (i=0;i<16;i++) {
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lshift(c, sc[i], 28);
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lshift(d, sc[i], 28);
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concat(cd, c, d, 28, 28);
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permute(ki[i], cd, perm2, 48);
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}
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permute(pd1, in, perm3, 64);
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for (j=0;j<32;j++) {
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l[j] = pd1[j];
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r[j] = pd1[j+32];
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}
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for (i=0;i<16;i++) {
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char er[48];
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char erk[48];
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char b[8][6];
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char cb[32];
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char pcb[32];
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char r2[32];
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permute(er, r, perm4, 48);
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x_or(erk, er, ki[forw ? i : 15 - i], 48);
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for (j=0;j<8;j++)
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for (k=0;k<6;k++)
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b[j][k] = erk[j*6 + k];
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for (j=0;j<8;j++) {
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int m, n;
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m = (b[j][0]<<1) | b[j][5];
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n = (b[j][1]<<3) | (b[j][2]<<2) | (b[j][3]<<1) | b[j][4];
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for (k=0;k<4;k++)
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b[j][k] = (sbox[j][m][n] & (1<<(3-k)))?1:0;
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}
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for (j=0;j<8;j++)
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for (k=0;k<4;k++)
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cb[j*4+k] = b[j][k];
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permute(pcb, cb, perm5, 32);
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x_or(r2, l, pcb, 32);
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for (j=0;j<32;j++)
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l[j] = r[j];
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for (j=0;j<32;j++)
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r[j] = r2[j];
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}
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concat(rl, r, l, 32, 32);
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permute(out, rl, perm6, 64);
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}
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/* Convert a 7 byte string to an 8 byte key. */
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static void str_to_key(const unsigned char str[7], unsigned char key[8])
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{
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int i;
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key[0] = str[0]>>1;
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key[1] = ((str[0]&0x01)<<6) | (str[1]>>2);
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key[2] = ((str[1]&0x03)<<5) | (str[2]>>3);
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key[3] = ((str[2]&0x07)<<4) | (str[3]>>4);
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key[4] = ((str[3]&0x0F)<<3) | (str[4]>>5);
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key[5] = ((str[4]&0x1F)<<2) | (str[5]>>6);
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key[6] = ((str[5]&0x3F)<<1) | (str[6]>>7);
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key[7] = str[6]&0x7F;
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for (i=0;i<8;i++) {
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key[i] = (key[i]<<1);
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}
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}
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void des_crypt56(unsigned char *out, const unsigned char *in, const unsigned char *key, int forw)
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{
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int i;
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char outb[64];
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char inb[64];
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char keyb[64];
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unsigned char key2[8];
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str_to_key(key, key2);
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for (i=0;i<64;i++) {
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inb[i] = (in[i/8] & (1<<(7-(i%8)))) ? 1 : 0;
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keyb[i] = (key2[i/8] & (1<<(7-(i%8)))) ? 1 : 0;
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outb[i] = 0;
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}
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dohash(outb, inb, keyb, forw);
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for (i=0;i<8;i++) {
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out[i] = 0;
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}
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for (i=0;i<64;i++) {
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if (outb[i])
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out[i/8] |= (1<<(7-(i%8)));
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}
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}
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void E_P16(const unsigned char *p14,unsigned char *p16)
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{
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unsigned char sp8[8] = {0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25};
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des_crypt56(p16, sp8, p14, 1);
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des_crypt56(p16+8, sp8, p14+7, 1);
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}
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void E_P24(const unsigned char *p21, const unsigned char *c8, unsigned char *p24)
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{
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des_crypt56(p24, c8, p21, 1);
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des_crypt56(p24+8, c8, p21+7, 1);
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des_crypt56(p24+16, c8, p21+14, 1);
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}
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void D_P16(const unsigned char *p14, const unsigned char *in, unsigned char *out)
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{
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des_crypt56(out, in, p14, 0);
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des_crypt56(out+8, in+8, p14+7, 0);
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}
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void E_old_pw_hash( unsigned char *p14, const unsigned char *in, unsigned char *out)
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{
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des_crypt56(out, in, p14, 1);
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des_crypt56(out+8, in+8, p14+7, 1);
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}
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/* forward des encryption with a 128 bit key */
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void des_crypt128(unsigned char out[8], const unsigned char in[8], const unsigned char key[16])
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{
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unsigned char buf[8];
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des_crypt56(buf, in, key, 1);
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des_crypt56(out, buf, key+9, 1);
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}
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/* forward des encryption with a 64 bit key */
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void des_crypt64(unsigned char out[8], const unsigned char in[8], const unsigned char key[8])
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{
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unsigned char buf[8];
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unsigned char key2[8];
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memset(key2,'\0',8);
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des_crypt56(buf, in, key, 1);
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key2[0] = key[7];
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des_crypt56(out, buf, key2, 1);
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}
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/* des encryption with a 112 bit (14 byte) key */
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/* Note that if the forw is 1, and key is actually 8 bytes of key, followed by 6 bytes of zeros,
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this is identical to des_crypt64(). JRA. */
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void des_crypt112(unsigned char out[8], const unsigned char in[8], const unsigned char key[14], int forw)
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{
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unsigned char buf[8];
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des_crypt56(buf, in, key, forw);
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des_crypt56(out, buf, key+7, forw);
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}
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void cred_hash3(unsigned char *out, const unsigned char *in, const unsigned char *key, int forw)
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{
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unsigned char key2[8];
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memset(key2,'\0',8);
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des_crypt56(out, in, key, forw);
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key2[0] = key[7];
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des_crypt56(out + 8, in + 8, key2, forw);
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}
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/* des encryption of a 16 byte lump of data with a 112 bit key */
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/* Note that if the key is actually 8 bytes of key, followed by 6 bytes of zeros,
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this is identical to cred_hash3(). JRA. */
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void des_crypt112_16(unsigned char out[16], unsigned char in[16], const unsigned char key[14], int forw)
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{
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des_crypt56(out, in, key, forw);
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des_crypt56(out + 8, in + 8, key+7, forw);
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}
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/*****************************************************************
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arc4 crypt/decrypt with a 16 byte key.
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*****************************************************************/
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void SamOEMhash( unsigned char *data, const unsigned char key[16], size_t len)
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{
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struct arcfour_state arc4_state;
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const DATA_BLOB keyblob = data_blob_const(key, 16);
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arcfour_init(&arc4_state, &keyblob);
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arcfour_crypt_sbox(&arc4_state, data, len);
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}
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void SamOEMhashBlob( unsigned char *data, size_t len, DATA_BLOB *key)
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{
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struct arcfour_state arc4_state;
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arcfour_init(&arc4_state, key);
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arcfour_crypt_sbox(&arc4_state, data, len);
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}
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/* Decode a sam password hash into a password. The password hash is the
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same method used to store passwords in the NT registry. The DES key
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used is based on the RID of the user. */
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void sam_pwd_hash(unsigned int rid, const uchar *in, uchar *out, int forw)
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{
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uchar s[14];
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s[0] = s[4] = s[8] = s[12] = (uchar)(rid & 0xFF);
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s[1] = s[5] = s[9] = s[13] = (uchar)((rid >> 8) & 0xFF);
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s[2] = s[6] = s[10] = (uchar)((rid >> 16) & 0xFF);
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s[3] = s[7] = s[11] = (uchar)((rid >> 24) & 0xFF);
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des_crypt56(out, in, s, forw);
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des_crypt56(out+8, in+8, s+7, forw);
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}
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