source/libsmb/smbdes.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    a partial implementation of DES designed for use in the
   5    SMB authentication protocol
   6
   7    Copyright (C) Andrew Tridgell 1998
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25
  26 /* NOTES:
  27
  28    This code makes no attempt to be fast! In fact, it is a very
  29    slow implementation
  30
  31    This code is NOT a complete DES implementation. It implements only
  32    the minimum necessary for SMB authentication, as used by all SMB
  33    products (including every copy of Microsoft Windows95 ever sold)
  34
  35    In particular, it can only do a unchained forward DES pass. This
  36    means it is not possible to use this code for encryption/decryption
  37    of data, instead it is only useful as a "hash" algorithm.
  38
  39    There is no entry point into this code that allows normal DES operation.
  40
  41    I believe this means that this code does not come under ITAR
  42    regulations but this is NOT a legal opinion. If you are concerned
  43    about the applicability of ITAR regulations to this code then you
  44    should confirm it for yourself (and maybe let me know if you come
  45    up with a different answer to the one above)
  46 */
  47
  48
  49 #define uchar unsigned char
  50
  51 static const uchar perm1[56] = {57, 49, 41, 33, 25, 17,  9,
  52                          1, 58, 50, 42, 34, 26, 18,
  53                         10,  2, 59, 51, 43, 35, 27,
  54                         19, 11,  3, 60, 52, 44, 36,
  55                         63, 55, 47, 39, 31, 23, 15,
  56                          7, 62, 54, 46, 38, 30, 22,
  57                         14,  6, 61, 53, 45, 37, 29,
  58                         21, 13,  5, 28, 20, 12,  4};
  59
  60 static const uchar perm2[48] = {14, 17, 11, 24,  1,  5,
  61                          3, 28, 15,  6, 21, 10,
  62                         23, 19, 12,  4, 26,  8,
  63                         16,  7, 27, 20, 13,  2,
  64                         41, 52, 31, 37, 47, 55,
  65                         30, 40, 51, 45, 33, 48,
  66                         44, 49, 39, 56, 34, 53,
  67                         46, 42, 50, 36, 29, 32};
  68
  69 static const uchar perm3[64] = {58, 50, 42, 34, 26, 18, 10,  2,
  70                         60, 52, 44, 36, 28, 20, 12,  4,
  71                         62, 54, 46, 38, 30, 22, 14,  6,
  72                         64, 56, 48, 40, 32, 24, 16,  8,
  73                         57, 49, 41, 33, 25, 17,  9,  1,
  74                         59, 51, 43, 35, 27, 19, 11,  3,
  75                         61, 53, 45, 37, 29, 21, 13,  5,
  76                         63, 55, 47, 39, 31, 23, 15,  7};
  77
  78 static const uchar perm4[48] = {   32,  1,  2,  3,  4,  5,
  79                             4,  5,  6,  7,  8,  9,
  80                             8,  9, 10, 11, 12, 13,
  81                            12, 13, 14, 15, 16, 17,
  82                            16, 17, 18, 19, 20, 21,
  83                            20, 21, 22, 23, 24, 25,
  84                            24, 25, 26, 27, 28, 29,
  85                            28, 29, 30, 31, 32,  1};
  86
  87 static const uchar perm5[32] = {      16,  7, 20, 21,
  88                               29, 12, 28, 17,
  89                                1, 15, 23, 26,
  90                                5, 18, 31, 10,
  91                                2,  8, 24, 14,
  92                               32, 27,  3,  9,
  93                               19, 13, 30,  6,
  94                               22, 11,  4, 25};
  95
  96
  97 static const uchar perm6[64] ={ 40,  8, 48, 16, 56, 24, 64, 32,
  98                         39,  7, 47, 15, 55, 23, 63, 31,
  99                         38,  6, 46, 14, 54, 22, 62, 30,
 100                         37,  5, 45, 13, 53, 21, 61, 29,
 101                         36,  4, 44, 12, 52, 20, 60, 28,
 102                         35,  3, 43, 11, 51, 19, 59, 27,
 103                         34,  2, 42, 10, 50, 18, 58, 26,
 104                         33,  1, 41,  9, 49, 17, 57, 25};
 105
 106
 107 static const uchar sc[16] = {1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1};
 108
 109 static const uchar sbox[8][4][16] = {
 110         {{14,  4, 13,  1,  2, 15, 11,  8,  3, 10,  6, 12,  5,  9,  0,  7},
 111          {0, 15,  7,  4, 14,  2, 13,  1, 10,  6, 12, 11,  9,  5,  3,  8},
 112          {4,  1, 14,  8, 13,  6,  2, 11, 15, 12,  9,  7,  3, 10,  5,  0},
 113          {15, 12,  8,  2,  4,  9,  1,  7,  5, 11,  3, 14, 10,  0,  6, 13}},
 114
 115         {{15,  1,  8, 14,  6, 11,  3,  4,  9,  7,  2, 13, 12,  0,  5, 10},
 116          {3, 13,  4,  7, 15,  2,  8, 14, 12,  0,  1, 10,  6,  9, 11,  5},
 117          {0, 14,  7, 11, 10,  4, 13,  1,  5,  8, 12,  6,  9,  3,  2, 15},
 118          {13,  8, 10,  1,  3, 15,  4,  2, 11,  6,  7, 12,  0,  5, 14,  9}},
 119
 120         {{10,  0,  9, 14,  6,  3, 15,  5,  1, 13, 12,  7, 11,  4,  2,  8},
 121          {13,  7,  0,  9,  3,  4,  6, 10,  2,  8,  5, 14, 12, 11, 15,  1},
 122          {13,  6,  4,  9,  8, 15,  3,  0, 11,  1,  2, 12,  5, 10, 14,  7},
 123          {1, 10, 13,  0,  6,  9,  8,  7,  4, 15, 14,  3, 11,  5,  2, 12}},
 124
 125         {{7, 13, 14,  3,  0,  6,  9, 10,  1,  2,  8,  5, 11, 12,  4, 15},
 126          {13,  8, 11,  5,  6, 15,  0,  3,  4,  7,  2, 12,  1, 10, 14,  9},
 127          {10,  6,  9,  0, 12, 11,  7, 13, 15,  1,  3, 14,  5,  2,  8,  4},
 128          {3, 15,  0,  6, 10,  1, 13,  8,  9,  4,  5, 11, 12,  7,  2, 14}},
 129
 130         {{2, 12,  4,  1,  7, 10, 11,  6,  8,  5,  3, 15, 13,  0, 14,  9},
 131          {14, 11,  2, 12,  4,  7, 13,  1,  5,  0, 15, 10,  3,  9,  8,  6},
 132          {4,  2,  1, 11, 10, 13,  7,  8, 15,  9, 12,  5,  6,  3,  0, 14},
 133          {11,  8, 12,  7,  1, 14,  2, 13,  6, 15,  0,  9, 10,  4,  5,  3}},
 134
 135         {{12,  1, 10, 15,  9,  2,  6,  8,  0, 13,  3,  4, 14,  7,  5, 11},
 136          {10, 15,  4,  2,  7, 12,  9,  5,  6,  1, 13, 14,  0, 11,  3,  8},
 137          {9, 14, 15,  5,  2,  8, 12,  3,  7,  0,  4, 10,  1, 13, 11,  6},
 138          {4,  3,  2, 12,  9,  5, 15, 10, 11, 14,  1,  7,  6,  0,  8, 13}},
 139
 140         {{4, 11,  2, 14, 15,  0,  8, 13,  3, 12,  9,  7,  5, 10,  6,  1},
 141          {13,  0, 11,  7,  4,  9,  1, 10, 14,  3,  5, 12,  2, 15,  8,  6},
 142          {1,  4, 11, 13, 12,  3,  7, 14, 10, 15,  6,  8,  0,  5,  9,  2},
 143          {6, 11, 13,  8,  1,  4, 10,  7,  9,  5,  0, 15, 14,  2,  3, 12}},
 144
 145         {{13,  2,  8,  4,  6, 15, 11,  1, 10,  9,  3, 14,  5,  0, 12,  7},
 146          {1, 15, 13,  8, 10,  3,  7,  4, 12,  5,  6, 11,  0, 14,  9,  2},
 147          {7, 11,  4,  1,  9, 12, 14,  2,  0,  6, 10, 13, 15,  3,  5,  8},
 148          {2,  1, 14,  7,  4, 10,  8, 13, 15, 12,  9,  0,  3,  5,  6, 11}}};
 149
 150 static void permute(char *out, const char *in, const uchar *p, int n)
 151 {
 152         int i;
 153         for (i=0;i<n;i++)
 154                 out[i] = in[p[i]-1];
 155 }
 156
 157 static void lshift(char *d, int count, int n)
 158 {
 159         char out[64];
 160         int i;
 161         for (i=0;i<n;i++)
 162                 out[i] = d[(i+count)%n];
 163         for (i=0;i<n;i++)
 164                 d[i] = out[i];
 165 }
 166
 167 static void concat(char *out, char *in1, char *in2, int l1, int l2)
 168 {
 169         while (l1--)
 170                 *out++ = *in1++;
 171         while (l2--)
 172                 *out++ = *in2++;
 173 }
 174
 175 static void xor(char *out, char *in1, char *in2, int n)
 176 {
 177         int i;
 178         for (i=0;i<n;i++)
 179                 out[i] = in1[i] ^ in2[i];
 180 }
 181
 182 static void dohash(char *out, char *in, char *key, int forw)
 183 {
 184         int i, j, k;
 185         char pk1[56];
 186         char c[28];
 187         char d[28];
 188         char cd[56];
 189         char ki[16][48];
 190         char pd1[64];
 191         char l[32], r[32];
 192         char rl[64];
 193
 194         permute(pk1, key, perm1, 56);
 195
 196         for (i=0;i<28;i++)
 197                 c[i] = pk1[i];
 198         for (i=0;i<28;i++)
 199                 d[i] = pk1[i+28];
 200
 201         for (i=0;i<16;i++) {
 202                 lshift(c, sc[i], 28);
 203                 lshift(d, sc[i], 28);
 204
 205                 concat(cd, c, d, 28, 28);
 206                 permute(ki[i], cd, perm2, 48);
 207         }
 208
 209         permute(pd1, in, perm3, 64);
 210
 211         for (j=0;j<32;j++) {
 212                 l[j] = pd1[j];
 213                 r[j] = pd1[j+32];
 214         }
 215
 216         for (i=0;i<16;i++) {
 217                 char er[48];
 218                 char erk[48];
 219                 char b[8][6];
 220                 char cb[32];
 221                 char pcb[32];
 222                 char r2[32];
 223
 224                 permute(er, r, perm4, 48);
 225
 226                 xor(erk, er, ki[forw ? i : 15 - i], 48);
 227
 228                 for (j=0;j<8;j++)
 229                         for (k=0;k<6;k++)
 230                                 b[j][k] = erk[j*6 + k];
 231
 232                 for (j=0;j<8;j++) {
 233                         int m, n;
 234                         m = (b[j][0]<<1) | b[j][5];
 235
 236                         n = (b[j][1]<<3) | (b[j][2]<<2) | (b[j][3]<<1) | b[j][4];
 237
 238                         for (k=0;k<4;k++)
 239                                 b[j][k] = (sbox[j][m][n] & (1<<(3-k)))?1:0;
 240                 }
 241
 242                 for (j=0;j<8;j++)
 243                         for (k=0;k<4;k++)
 244                                 cb[j*4+k] = b[j][k];
 245                 permute(pcb, cb, perm5, 32);
 246
 247                 xor(r2, l, pcb, 32);
 248
 249                 for (j=0;j<32;j++)
 250                         l[j] = r[j];
 251
 252                 for (j=0;j<32;j++)
 253                         r[j] = r2[j];
 254         }
 255
 256         concat(rl, r, l, 32, 32);
 257
 258         permute(out, rl, perm6, 64);
 259 }
 260
 261 static void str_to_key(const unsigned char *str,unsigned char *key)
 262 {
 263         int i;
 264
 265         key[0] = str[0]>>1;
 266         key[1] = ((str[0]&0x01)<<6) | (str[1]>>2);
 267         key[2] = ((str[1]&0x03)<<5) | (str[2]>>3);
 268         key[3] = ((str[2]&0x07)<<4) | (str[3]>>4);
 269         key[4] = ((str[3]&0x0F)<<3) | (str[4]>>5);
 270         key[5] = ((str[4]&0x1F)<<2) | (str[5]>>6);
 271         key[6] = ((str[5]&0x3F)<<1) | (str[6]>>7);
 272         key[7] = str[6]&0x7F;
 273         for (i=0;i<8;i++) {
 274                 key[i] = (key[i]<<1);
 275         }
 276 }
 277
 278
 279 static void smbhash(unsigned char *out, const unsigned char *in, const unsigned char *key, int forw)
 280 {
 281         int i;
 282         char outb[64];
 283         char inb[64];
 284         char keyb[64];
 285         unsigned char key2[8];
 286
 287         str_to_key(key, key2);
 288
 289         for (i=0;i<64;i++) {
 290                 inb[i] = (in[i/8] & (1<<(7-(i%8)))) ? 1 : 0;
 291                 keyb[i] = (key2[i/8] & (1<<(7-(i%8)))) ? 1 : 0;
 292                 outb[i] = 0;
 293         }
 294
 295         dohash(outb, inb, keyb, forw);
 296
 297         for (i=0;i<8;i++) {
 298                 out[i] = 0;
 299         }
 300
 301         for (i=0;i<64;i++) {
 302                 if (outb[i])
 303                         out[i/8] |= (1<<(7-(i%8)));
 304         }
 305 }
 306
 307 void E_P16(const unsigned char *p14,unsigned char *p16)
 308 {
 309         unsigned char sp8[8] = {0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25};
 310         smbhash(p16, sp8, p14, 1);
 311         smbhash(p16+8, sp8, p14+7, 1);
 312 }
 313
 314 void E_P24(const unsigned char *p21, const unsigned char *c8, unsigned char *p24)
 315 {
 316         smbhash(p24, c8, p21, 1);
 317         smbhash(p24+8, c8, p21+7, 1);
 318         smbhash(p24+16, c8, p21+14, 1);
 319 }
 320
 321 void D_P16(const unsigned char *p14, const unsigned char *in, unsigned char *out)
 322 {
 323         smbhash(out, in, p14, 0);
 324         smbhash(out+8, in+8, p14+7, 0);
 325 }
 326
 327 void E_old_pw_hash( unsigned char *p14, const unsigned char *in, unsigned char *out)
 328 {
 329         smbhash(out, in, p14, 1);
 330         smbhash(out+8, in+8, p14+7, 1);
 331 }
 332
 333 void cred_hash1(unsigned char *out, const unsigned char *in, const unsigned char *key)
 334 {
 335         unsigned char buf[8];
 336
 337         smbhash(buf, in, key, 1);
 338         smbhash(out, buf, key+9, 1);
 339 }
 340
 341 void cred_hash2(unsigned char *out, const unsigned char *in, const unsigned char *key)
 342 {
 343         unsigned char buf[8];
 344         static unsigned char key2[8];
 345
 346         smbhash(buf, in, key, 1);
 347         key2[0] = key[7];
 348         smbhash(out, buf, key2, 1);
 349 }
 350
 351 void cred_hash3(unsigned char *out, unsigned char *in, const unsigned char *key, int forw)
 352 {
 353         static unsigned char key2[8];
 354
 355         smbhash(out, in, key, forw);
 356         key2[0] = key[7];
 357         smbhash(out + 8, in + 8, key2, forw);
 358 }
 359
 360 void SamOEMhash( unsigned char *data, const unsigned char *key, int val)
 361 {
 362   unsigned char s_box[256];
 363   unsigned char index_i = 0;
 364   unsigned char index_j = 0;
 365   unsigned char j = 0;
 366   int ind;
 367
 368   for (ind = 0; ind < 256; ind++)
 369   {
 370     s_box[ind] = (unsigned char)ind;
 371   }
 372
 373   for( ind = 0; ind < 256; ind++)
 374   {
 375      unsigned char tc;
 376
 377      j += (s_box[ind] + key[ind%16]);
 378
 379      tc = s_box[ind];
 380      s_box[ind] = s_box[j];
 381      s_box[j] = tc;
 382   }
 383   for( ind = 0; ind < val; ind++)
 384   {
 385     unsigned char tc;
 386     unsigned char t;
 387
 388     index_i++;
 389     index_j += s_box[index_i];
 390
 391     tc = s_box[index_i];
 392     s_box[index_i] = s_box[index_j];
 393     s_box[index_j] = tc;
 394
 395     t = s_box[index_i] + s_box[index_j];
 396     data[ind] = data[ind] ^ s_box[t];
 397   }
 398 }
 399
 400 void SamOEMhashBlob( unsigned char *data, int len, DATA_BLOB *key)
 401 {
 402   unsigned char s_box[256];
 403   unsigned char index_i = 0;
 404   unsigned char index_j = 0;
 405   unsigned char j = 0;
 406   int ind;
 407
 408   for (ind = 0; ind < 256; ind++)
 409   {
 410     s_box[ind] = (unsigned char)ind;
 411   }
 412
 413   for( ind = 0; ind < 256; ind++)
 414   {
 415      unsigned char tc;
 416
 417      j += (s_box[ind] + key->data[ind%key->length]);
 418
 419      tc = s_box[ind];
 420      s_box[ind] = s_box[j];
 421      s_box[j] = tc;
 422   }
 423   for( ind = 0; ind < len; ind++)
 424   {
 425     unsigned char tc;
 426     unsigned char t;
 427
 428     index_i++;
 429     index_j += s_box[index_i];
 430
 431     tc = s_box[index_i];
 432     s_box[index_i] = s_box[index_j];
 433     s_box[index_j] = tc;
 434
 435     t = s_box[index_i] + s_box[index_j];
 436     data[ind] = data[ind] ^ s_box[t];
 437   }
 438 }
 439
 440 /* Decode a sam password hash into a password.  The password hash is the
 441    same method used to store passwords in the NT registry.  The DES key
 442    used is based on the RID of the user. */
 443
 444 void sam_pwd_hash(unsigned int rid, const uchar *in, uchar *out, int forw)
 445 {
 446         uchar s[14];
 447
 448         s[0] = s[4] = s[8] = s[12] = (uchar)(rid & 0xFF);
 449         s[1] = s[5] = s[9] = s[13] = (uchar)((rid >> 8) & 0xFF);
 450         s[2] = s[6] = s[10]        = (uchar)((rid >> 16) & 0xFF);
 451         s[3] = s[7] = s[11]        = (uchar)((rid >> 24) & 0xFF);
 452
 453         smbhash(out, in, s, forw);
 454         smbhash(out+8, in+8, s+7, forw);
 455 }