i386/MIT/course/src/git.lab/net/lwip/netif/ppp/chpms.c

   1 /*** WARNING - THIS CODE HAS NOT BEEN FINISHED! ***/
   2 /*****************************************************************************
   3 * chpms.c - Network MicroSoft Challenge Handshake Authentication Protocol program file.
   4 *
   5 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
   6 * Copyright (c) 1997 by Global Election Systems Inc.  All rights reserved.
   7 *
   8 * The authors hereby grant permission to use, copy, modify, distribute,
   9 * and license this software and its documentation for any purpose, provided
  10 * that existing copyright notices are retained in all copies and that this
  11 * notice and the following disclaimer are included verbatim in any
  12 * distributions. No written agreement, license, or royalty fee is required
  13 * for any of the authorized uses.
  14 *
  15 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
  16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25 *
  26 ******************************************************************************
  27 * REVISION HISTORY
  28 *
  29 * 03-01-01 Marc Boucher <marc@mbsi.ca>
  30 *   Ported to lwIP.
  31 * 97-12-08 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
  32 *   Original based on BSD chap_ms.c.
  33 *****************************************************************************/
  34 /*
  35  * chap_ms.c - Microsoft MS-CHAP compatible implementation.
  36  *
  37  * Copyright (c) 1995 Eric Rosenquist, Strata Software Limited.
  38  * http://www.strataware.com/
  39  *
  40  * All rights reserved.
  41  *
  42  * Redistribution and use in source and binary forms are permitted
  43  * provided that the above copyright notice and this paragraph are
  44  * duplicated in all such forms and that any documentation,
  45  * advertising materials, and other materials related to such
  46  * distribution and use acknowledge that the software was developed
  47  * by Eric Rosenquist.  The name of the author may not be used to
  48  * endorse or promote products derived from this software without
  49  * specific prior written permission.
  50  *
  51  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  52  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  53  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  54  */
  55
  56 /*
  57  * Modifications by Lauri Pesonen / lpesonen@clinet.fi, april 1997
  58  *
  59  *   Implemented LANManager type password response to MS-CHAP challenges.
  60  *   Now pppd provides both NT style and LANMan style blocks, and the
  61  *   prefered is set by option "ms-lanman". Default is to use NT.
  62  *   The hash text (StdText) was taken from Win95 RASAPI32.DLL.
  63  *
  64  *   You should also use DOMAIN\\USERNAME as described in README.MSCHAP80
  65  */
  66
  67 #define USE_CRYPT
  68
  69 #include "lwip/opt.h"
  70
  71 #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
  72
  73 #if MSCHAP_SUPPORT /* don't build if not configured for use in lwipopts.h */
  74
  75 #include "ppp.h"
  76 #include "pppdebug.h"
  77
  78 #include "md4.h"
  79 #ifndef USE_CRYPT
  80 #include "des.h"
  81 #endif
  82 #include "chap.h"
  83 #include "chpms.h"
  84
  85
  86 /*************************/
  87 /*** LOCAL DEFINITIONS ***/
  88 /*************************/
  89
  90
  91 /************************/
  92 /*** LOCAL DATA TYPES ***/
  93 /************************/
  94 typedef struct {
  95     u_char LANManResp[24];
  96     u_char NTResp[24];
  97     u_char UseNT; /* If 1, ignore the LANMan response field */
  98 } MS_ChapResponse;
  99 /* We use MS_CHAP_RESPONSE_LEN, rather than sizeof(MS_ChapResponse),
 100    in case this struct gets padded. */
 101
 102
 103
 104 /***********************************/
 105 /*** LOCAL FUNCTION DECLARATIONS ***/
 106 /***********************************/
 107
 108 /* XXX Don't know what to do with these. */
 109 extern void setkey(const char *);
 110 extern void encrypt(char *, int);
 111
 112 static void DesEncrypt (u_char *, u_char *, u_char *);
 113 static void MakeKey (u_char *, u_char *);
 114
 115 #ifdef USE_CRYPT
 116 static void Expand (u_char *, u_char *);
 117 static void Collapse (u_char *, u_char *);
 118 #endif
 119
 120 static void ChallengeResponse(
 121   u_char *challenge, /* IN   8 octets */
 122   u_char *pwHash,    /* IN  16 octets */
 123   u_char *response   /* OUT 24 octets */
 124 );
 125 static void ChapMS_NT(
 126   char *rchallenge,
 127   int rchallenge_len,
 128   char *secret,
 129   int secret_len,
 130   MS_ChapResponse *response
 131 );
 132 static u_char Get7Bits(
 133   u_char *input,
 134   int startBit
 135 );
 136
 137
 138 /***********************************/
 139 /*** PUBLIC FUNCTION DEFINITIONS ***/
 140 /***********************************/
 141 void
 142 ChapMS( chap_state *cstate, char *rchallenge, int rchallenge_len, char *secret, int secret_len)
 143 {
 144   MS_ChapResponse response;
 145 #ifdef MSLANMAN
 146   extern int ms_lanman;
 147 #endif
 148
 149 #if 0
 150   CHAPDEBUG((LOG_INFO, "ChapMS: secret is '%.*s'\n", secret_len, secret));
 151 #endif
 152   BZERO(&response, sizeof(response));
 153
 154   /* Calculate both always */
 155   ChapMS_NT(rchallenge, rchallenge_len, secret, secret_len, &response);
 156
 157 #ifdef MSLANMAN
 158   ChapMS_LANMan(rchallenge, rchallenge_len, secret, secret_len, &response);
 159
 160   /* prefered method is set by option  */
 161   response.UseNT = !ms_lanman;
 162 #else
 163   response.UseNT = 1;
 164 #endif
 165
 166   BCOPY(&response, cstate->response, MS_CHAP_RESPONSE_LEN);
 167   cstate->resp_length = MS_CHAP_RESPONSE_LEN;
 168 }
 169
 170
 171 /**********************************/
 172 /*** LOCAL FUNCTION DEFINITIONS ***/
 173 /**********************************/
 174 static void
 175 ChallengeResponse( u_char *challenge, /* IN   8 octets */
 176                    u_char *pwHash,    /* IN  16 octets */
 177                    u_char *response   /* OUT 24 octets */)
 178 {
 179   char    ZPasswordHash[21];
 180
 181   BZERO(ZPasswordHash, sizeof(ZPasswordHash));
 182   BCOPY(pwHash, ZPasswordHash, 16);
 183
 184 #if 0
 185   log_packet(ZPasswordHash, sizeof(ZPasswordHash), "ChallengeResponse - ZPasswordHash", LOG_DEBUG);
 186 #endif
 187
 188   DesEncrypt(challenge, ZPasswordHash +  0, response + 0);
 189   DesEncrypt(challenge, ZPasswordHash +  7, response + 8);
 190   DesEncrypt(challenge, ZPasswordHash + 14, response + 16);
 191
 192 #if 0
 193   log_packet(response, 24, "ChallengeResponse - response", LOG_DEBUG);
 194 #endif
 195 }
 196
 197
 198 #ifdef USE_CRYPT
 199 static void
 200 DesEncrypt( u_char *clear, /* IN  8 octets */
 201             u_char *key,   /* IN  7 octets */
 202             u_char *cipher /* OUT 8 octets */)
 203 {
 204   u_char des_key[8];
 205   u_char crypt_key[66];
 206   u_char des_input[66];
 207
 208   MakeKey(key, des_key);
 209
 210   Expand(des_key, crypt_key);
 211   setkey(crypt_key);
 212
 213 #if 0
 214   CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet input : %02X%02X%02X%02X%02X%02X%02X%02X\n",
 215              clear[0], clear[1], clear[2], clear[3], clear[4], clear[5], clear[6], clear[7]));
 216 #endif
 217
 218   Expand(clear, des_input);
 219   encrypt(des_input, 0);
 220   Collapse(des_input, cipher);
 221
 222 #if 0
 223   CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
 224              cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));
 225 #endif
 226 }
 227
 228 #else /* USE_CRYPT */
 229
 230 static void
 231 DesEncrypt( u_char *clear, /* IN  8 octets */
 232             u_char *key,   /* IN  7 octets */
 233             u_char *cipher /* OUT 8 octets */)
 234 {
 235   des_cblock    des_key;
 236   des_key_schedule  key_schedule;
 237
 238   MakeKey(key, des_key);
 239
 240   des_set_key(&des_key, key_schedule);
 241
 242 #if 0
 243   CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet input : %02X%02X%02X%02X%02X%02X%02X%02X\n",
 244              clear[0], clear[1], clear[2], clear[3], clear[4], clear[5], clear[6], clear[7]));
 245 #endif
 246
 247   des_ecb_encrypt((des_cblock *)clear, (des_cblock *)cipher, key_schedule, 1);
 248
 249 #if 0
 250   CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
 251              cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));
 252 #endif
 253 }
 254
 255 #endif /* USE_CRYPT */
 256
 257
 258 static u_char
 259 Get7Bits( u_char *input, int startBit)
 260 {
 261   register unsigned int  word;
 262
 263   word  = (unsigned)input[startBit / 8] << 8;
 264   word |= (unsigned)input[startBit / 8 + 1];
 265
 266   word >>= 15 - (startBit % 8 + 7);
 267
 268   return word & 0xFE;
 269 }
 270
 271 #ifdef USE_CRYPT
 272
 273 /* in == 8-byte string (expanded version of the 56-bit key)
 274  * out == 64-byte string where each byte is either 1 or 0
 275  * Note that the low-order "bit" is always ignored by by setkey()
 276  */
 277 static void
 278 Expand(u_char *in, u_char *out)
 279 {
 280   int j, c;
 281   int i;
 282
 283   for(i = 0; i < 64; in++){
 284     c = *in;
 285     for(j = 7; j >= 0; j--) {
 286       *out++ = (c >> j) & 01;
 287     }
 288     i += 8;
 289   }
 290 }
 291
 292 /* The inverse of Expand
 293  */
 294 static void
 295 Collapse(u_char *in, u_char *out)
 296 {
 297   int j;
 298   int i;
 299   unsigned int c;
 300
 301   for (i = 0; i < 64; i += 8, out++) {
 302     c = 0;
 303     for (j = 7; j >= 0; j--, in++) {
 304       c |= *in << j;
 305     }
 306     *out = c & 0xff;
 307   }
 308 }
 309 #endif
 310
 311 static void
 312 MakeKey( u_char *key,    /* IN  56 bit DES key missing parity bits */
 313          u_char *des_key /* OUT 64 bit DES key with parity bits added */)
 314 {
 315   des_key[0] = Get7Bits(key,  0);
 316   des_key[1] = Get7Bits(key,  7);
 317   des_key[2] = Get7Bits(key, 14);
 318   des_key[3] = Get7Bits(key, 21);
 319   des_key[4] = Get7Bits(key, 28);
 320   des_key[5] = Get7Bits(key, 35);
 321   des_key[6] = Get7Bits(key, 42);
 322   des_key[7] = Get7Bits(key, 49);
 323
 324 #ifndef USE_CRYPT
 325   des_set_odd_parity((des_cblock *)des_key);
 326 #endif
 327
 328 #if 0
 329   CHAPDEBUG((LOG_INFO, "MakeKey: 56-bit input : %02X%02X%02X%02X%02X%02X%02X\n",
 330              key[0], key[1], key[2], key[3], key[4], key[5], key[6]));
 331   CHAPDEBUG((LOG_INFO, "MakeKey: 64-bit output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
 332              des_key[0], des_key[1], des_key[2], des_key[3], des_key[4], des_key[5], des_key[6], des_key[7]));
 333 #endif
 334 }
 335
 336 static void
 337 ChapMS_NT( char *rchallenge,
 338            int rchallenge_len,
 339            char *secret,
 340            int secret_len,
 341            MS_ChapResponse *response)
 342 {
 343   int      i;
 344   MDstruct  md4Context;
 345   u_char    unicodePassword[MAX_NT_PASSWORD * 2];
 346   static int  low_byte_first = -1;
 347
 348   /* Initialize the Unicode version of the secret (== password). */
 349   /* This implicitly supports 8-bit ISO8859/1 characters. */
 350   BZERO(unicodePassword, sizeof(unicodePassword));
 351   for (i = 0; i < secret_len; i++) {
 352     unicodePassword[i * 2] = (u_char)secret[i];
 353   }
 354   MDbegin(&md4Context);
 355   MDupdate(&md4Context, unicodePassword, secret_len * 2 * 8);  /* Unicode is 2 bytes/char, *8 for bit count */
 356
 357   if (low_byte_first == -1) {
 358     low_byte_first = (htons((unsigned short int)1) != 1);
 359   }
 360   if (low_byte_first == 0) {
 361     MDreverse((u_long *)&md4Context);  /*  sfb 961105 */
 362   }
 363
 364   MDupdate(&md4Context, NULL, 0);  /* Tell MD4 we're done */
 365
 366   ChallengeResponse(rchallenge, (char *)md4Context.buffer, response->NTResp);
 367 }
 368
 369 #ifdef MSLANMAN
 370 static u_char *StdText = (u_char *)"KGS!@#$%"; /* key from rasapi32.dll */
 371
 372 static void
 373 ChapMS_LANMan( char *rchallenge,
 374                int rchallenge_len,
 375                char *secret,
 376                int secret_len,
 377                MS_ChapResponse  *response)
 378 {
 379   int      i;
 380   u_char    UcasePassword[MAX_NT_PASSWORD]; /* max is actually 14 */
 381   u_char    PasswordHash[16];
 382
 383   /* LANMan password is case insensitive */
 384   BZERO(UcasePassword, sizeof(UcasePassword));
 385   for (i = 0; i < secret_len; i++) {
 386     UcasePassword[i] = (u_char)toupper(secret[i]);
 387   }
 388   DesEncrypt( StdText, UcasePassword + 0, PasswordHash + 0 );
 389   DesEncrypt( StdText, UcasePassword + 7, PasswordHash + 8 );
 390   ChallengeResponse(rchallenge, PasswordHash, response->LANManResp);
 391 }
 392 #endif
 393
 394 #endif /* MSCHAP_SUPPORT */
 395
 396 #endif /* PPP_SUPPORT */