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419 lines
10 KiB
C
419 lines
10 KiB
C
/*
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Unix SMB/Netbios implementation.
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Version 1.9.
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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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Modified by Steve French (sfrench@us.ibm.com) 2002,2004
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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 2 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, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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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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#include <linux/slab.h>
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#include "cifsencrypt.h"
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#define uchar unsigned char
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static 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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};
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static 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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};
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static 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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};
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static 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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};
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static 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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};
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static 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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};
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static uchar sc[16] = { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 };
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static 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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};
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static void
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permute(char *out, char *in, 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
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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
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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
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xor(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
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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;
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char c[28];
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char d[28];
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char *cd;
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char (*ki)[48];
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char *pd1;
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char l[32], r[32];
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char *rl;
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/* Have to reduce stack usage */
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pk1 = kmalloc(56+56+64+64, GFP_KERNEL);
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if (pk1 == NULL)
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return;
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ki = kmalloc(16*48, GFP_KERNEL);
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if (ki == NULL) {
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kfree(pk1);
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return;
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}
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cd = pk1 + 56;
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pd1 = cd + 56;
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rl = pd1 + 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; /* er[48] */
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char *erk; /* erk[48] */
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char b[8][6];
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char *cb; /* cb[32] */
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char *pcb; /* pcb[32] */
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char *r2; /* r2[32] */
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er = kmalloc(48+48+32+32+32, GFP_KERNEL);
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if (er == NULL) {
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kfree(pk1);
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kfree(ki);
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return;
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}
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erk = er+48;
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cb = erk+48;
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pcb = cb+32;
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r2 = pcb+32;
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permute(er, r, perm4, 48);
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xor(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] <<
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1) | b[j][4];
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for (k = 0; k < 4; k++)
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b[j][k] =
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(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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xor(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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kfree(er);
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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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kfree(pk1);
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kfree(ki);
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}
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static void
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str_to_key(unsigned char *str, unsigned char *key)
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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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static void
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smbhash(unsigned char *out, unsigned char *in, unsigned char *key, int forw)
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{
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int i;
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char *outb; /* outb[64] */
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char *inb; /* inb[64] */
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char *keyb; /* keyb[64] */
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unsigned char key2[8];
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outb = kmalloc(64 * 3, GFP_KERNEL);
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if (outb == NULL)
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return;
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inb = outb + 64;
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keyb = inb + 64;
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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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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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kfree(outb);
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}
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void
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E_P16(unsigned char *p14, unsigned char *p16)
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{
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unsigned char sp8[8] =
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{ 0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25 };
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smbhash(p16, sp8, p14, 1);
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smbhash(p16 + 8, sp8, p14 + 7, 1);
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}
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void
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E_P24(unsigned char *p21, unsigned char *c8, unsigned char *p24)
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{
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smbhash(p24, c8, p21, 1);
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smbhash(p24 + 8, c8, p21 + 7, 1);
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smbhash(p24 + 16, c8, p21 + 14, 1);
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}
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#if 0 /* currently unsued */
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static void
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D_P16(unsigned char *p14, unsigned char *in, unsigned char *out)
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{
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smbhash(out, in, p14, 0);
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smbhash(out + 8, in + 8, p14 + 7, 0);
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}
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static void
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E_old_pw_hash(unsigned char *p14, unsigned char *in, unsigned char *out)
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{
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smbhash(out, in, p14, 1);
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smbhash(out + 8, in + 8, p14 + 7, 1);
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}
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/* these routines are currently unneeded, but may be
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needed later */
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void
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cred_hash1(unsigned char *out, unsigned char *in, unsigned char *key)
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{
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unsigned char buf[8];
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smbhash(buf, in, key, 1);
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smbhash(out, buf, key + 9, 1);
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}
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void
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cred_hash2(unsigned char *out, unsigned char *in, unsigned char *key)
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{
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unsigned char buf[8];
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static unsigned char key2[8];
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smbhash(buf, in, key, 1);
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key2[0] = key[7];
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smbhash(out, buf, key2, 1);
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}
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void
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cred_hash3(unsigned char *out, unsigned char *in, unsigned char *key, int forw)
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{
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static unsigned char key2[8];
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smbhash(out, in, key, forw);
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key2[0] = key[7];
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smbhash(out + 8, in + 8, key2, forw);
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}
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#endif /* unneeded routines */
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