lib/drivers/lwip/src/netif/ppp/chpms.c

   1 /*** WARNING - THIS CODE HAS NOT BEEN FINISHED! ***/
   2 /*** The original PPPD code is written in a way to require either the UNIX DES
   3      encryption functions encrypt(3) and setkey(3) or the DES library libdes.
   4      Since both is not included in lwIP, MSCHAP currently does not work! */
   5 /*****************************************************************************
   6 * chpms.c - Network MicroSoft Challenge Handshake Authentication Protocol program file.
   7 *
   8 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
   9 * Copyright (c) 1997 by Global Election Systems Inc.  All rights reserved.
  10 *
  11 * The authors hereby grant permission to use, copy, modify, distribute,
  12 * and license this software and its documentation for any purpose, provided
  13 * that existing copyright notices are retained in all copies and that this
  14 * notice and the following disclaimer are included verbatim in any
  15 * distributions. No written agreement, license, or royalty fee is required
  16 * for any of the authorized uses.
  17 *
  18 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
  19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28 *
  29 ******************************************************************************
  30 * REVISION HISTORY
  31 *
  32 * 03-01-01 Marc Boucher <marc@mbsi.ca>
  33 *   Ported to lwIP.
  34 * 97-12-08 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
  35 *   Original based on BSD chap_ms.c.
  36 *****************************************************************************/
  37 /*
  38  * chap_ms.c - Microsoft MS-CHAP compatible implementation.
  39  *
  40  * Copyright (c) 1995 Eric Rosenquist, Strata Software Limited.
  41  * http://www.strataware.com/
  42  *
  43  * All rights reserved.
  44  *
  45  * Redistribution and use in source and binary forms are permitted
  46  * provided that the above copyright notice and this paragraph are
  47  * duplicated in all such forms and that any documentation,
  48  * advertising materials, and other materials related to such
  49  * distribution and use acknowledge that the software was developed
  50  * by Eric Rosenquist.  The name of the author may not be used to
  51  * endorse or promote products derived from this software without
  52  * specific prior written permission.
  53  *
  54  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  55  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  56  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  57  */
  58
  59 /*
  60  * Modifications by Lauri Pesonen / lpesonen@clinet.fi, april 1997
  61  *
  62  *   Implemented LANManager type password response to MS-CHAP challenges.
  63  *   Now pppd provides both NT style and LANMan style blocks, and the
  64  *   prefered is set by option "ms-lanman". Default is to use NT.
  65  *   The hash text (StdText) was taken from Win95 RASAPI32.DLL.
  66  *
  67  *   You should also use DOMAIN\\USERNAME as described in README.MSCHAP80
  68  */
  69
  70 #define USE_CRYPT
  71
  72 #include "lwip/opt.h"
  73
  74 #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
  75
  76 #if MSCHAP_SUPPORT /* don't build if not configured for use in lwipopts.h */
  77
  78 #include "ppp.h"
  79 #include "pppdebug.h"
  80
  81 #include "md4.h"
  82 #ifndef USE_CRYPT
  83 #include "des.h"
  84 #endif
  85 #include "chap.h"
  86 #include "chpms.h"
  87
  88
  89 /*************************/
  90 /*** LOCAL DEFINITIONS ***/
  91 /*************************/
  92
  93
  94 /************************/
  95 /*** LOCAL DATA TYPES ***/
  96 /************************/
  97 typedef struct {
  98     u_char LANManResp[24];
  99     u_char NTResp[24];
 100     u_char UseNT; /* If 1, ignore the LANMan response field */
 101 } MS_ChapResponse;
 102 /* We use MS_CHAP_RESPONSE_LEN, rather than sizeof(MS_ChapResponse),
 103    in case this struct gets padded. */
 104
 105
 106
 107 /***********************************/
 108 /*** LOCAL FUNCTION DECLARATIONS ***/
 109 /***********************************/
 110
 111 /* XXX Don't know what to do with these. */
 112 extern void setkey(const char *);
 113 extern void encrypt(char *, int);
 114
 115 static void DesEncrypt (u_char *, u_char *, u_char *);
 116 static void MakeKey (u_char *, u_char *);
 117
 118 #ifdef USE_CRYPT
 119 static void Expand (u_char *, u_char *);
 120 static void Collapse (u_char *, u_char *);
 121 #endif
 122
 123 static void ChallengeResponse(
 124   u_char *challenge, /* IN   8 octets */
 125   u_char *pwHash,    /* IN  16 octets */
 126   u_char *response   /* OUT 24 octets */
 127 );
 128 static void ChapMS_NT(
 129   char *rchallenge,
 130   int rchallenge_len,
 131   char *secret,
 132   int secret_len,
 133   MS_ChapResponse *response
 134 );
 135 static u_char Get7Bits(
 136   u_char *input,
 137   int startBit
 138 );
 139
 140
 141 /***********************************/
 142 /*** PUBLIC FUNCTION DEFINITIONS ***/
 143 /***********************************/
 144 void
 145 ChapMS( chap_state *cstate, char *rchallenge, int rchallenge_len, char *secret, int secret_len)
 146 {
 147   MS_ChapResponse response;
 148 #ifdef MSLANMAN
 149   extern int ms_lanman;
 150 #endif
 151
 152 #if 0
 153   CHAPDEBUG((LOG_INFO, "ChapMS: secret is '%.*s'\n", secret_len, secret));
 154 #endif
 155   BZERO(&response, sizeof(response));
 156
 157   /* Calculate both always */
 158   ChapMS_NT(rchallenge, rchallenge_len, secret, secret_len, &response);
 159
 160 #ifdef MSLANMAN
 161   ChapMS_LANMan(rchallenge, rchallenge_len, secret, secret_len, &response);
 162
 163   /* prefered method is set by option  */
 164   response.UseNT = !ms_lanman;
 165 #else
 166   response.UseNT = 1;
 167 #endif
 168
 169   BCOPY(&response, cstate->response, MS_CHAP_RESPONSE_LEN);
 170   cstate->resp_length = MS_CHAP_RESPONSE_LEN;
 171 }
 172
 173
 174 /**********************************/
 175 /*** LOCAL FUNCTION DEFINITIONS ***/
 176 /**********************************/
 177 static void
 178 ChallengeResponse( u_char *challenge, /* IN   8 octets */
 179                    u_char *pwHash,    /* IN  16 octets */
 180                    u_char *response   /* OUT 24 octets */)
 181 {
 182   char    ZPasswordHash[21];
 183
 184   BZERO(ZPasswordHash, sizeof(ZPasswordHash));
 185   BCOPY(pwHash, ZPasswordHash, 16);
 186
 187 #if 0
 188   log_packet(ZPasswordHash, sizeof(ZPasswordHash), "ChallengeResponse - ZPasswordHash", LOG_DEBUG);
 189 #endif
 190
 191   DesEncrypt(challenge, ZPasswordHash +  0, response + 0);
 192   DesEncrypt(challenge, ZPasswordHash +  7, response + 8);
 193   DesEncrypt(challenge, ZPasswordHash + 14, response + 16);
 194
 195 #if 0
 196   log_packet(response, 24, "ChallengeResponse - response", LOG_DEBUG);
 197 #endif
 198 }
 199
 200
 201 #ifdef USE_CRYPT
 202 static void
 203 DesEncrypt( u_char *clear, /* IN  8 octets */
 204             u_char *key,   /* IN  7 octets */
 205             u_char *cipher /* OUT 8 octets */)
 206 {
 207   u_char des_key[8];
 208   u_char crypt_key[66];
 209   u_char des_input[66];
 210
 211   MakeKey(key, des_key);
 212
 213   Expand(des_key, crypt_key);
 214   setkey(crypt_key);
 215
 216 #if 0
 217   CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet input : %02X%02X%02X%02X%02X%02X%02X%02X\n",
 218              clear[0], clear[1], clear[2], clear[3], clear[4], clear[5], clear[6], clear[7]));
 219 #endif
 220
 221   Expand(clear, des_input);
 222   encrypt(des_input, 0);
 223   Collapse(des_input, cipher);
 224
 225 #if 0
 226   CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
 227              cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));
 228 #endif
 229 }
 230
 231 #else /* USE_CRYPT */
 232
 233 static void
 234 DesEncrypt( u_char *clear, /* IN  8 octets */
 235             u_char *key,   /* IN  7 octets */
 236             u_char *cipher /* OUT 8 octets */)
 237 {
 238   des_cblock    des_key;
 239   des_key_schedule  key_schedule;
 240
 241   MakeKey(key, des_key);
 242
 243   des_set_key(&des_key, key_schedule);
 244
 245 #if 0
 246   CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet input : %02X%02X%02X%02X%02X%02X%02X%02X\n",
 247              clear[0], clear[1], clear[2], clear[3], clear[4], clear[5], clear[6], clear[7]));
 248 #endif
 249
 250   des_ecb_encrypt((des_cblock *)clear, (des_cblock *)cipher, key_schedule, 1);
 251
 252 #if 0
 253   CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
 254              cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));
 255 #endif
 256 }
 257
 258 #endif /* USE_CRYPT */
 259
 260
 261 static u_char
 262 Get7Bits( u_char *input, int startBit)
 263 {
 264   register unsigned int  word;
 265
 266   word  = (unsigned)input[startBit / 8] << 8;
 267   word |= (unsigned)input[startBit / 8 + 1];
 268
 269   word >>= 15 - (startBit % 8 + 7);
 270
 271   return word & 0xFE;
 272 }
 273
 274 #ifdef USE_CRYPT
 275
 276 /* in == 8-byte string (expanded version of the 56-bit key)
 277  * out == 64-byte string where each byte is either 1 or 0
 278  * Note that the low-order "bit" is always ignored by by setkey()
 279  */
 280 static void
 281 Expand(u_char *in, u_char *out)
 282 {
 283   int j, c;
 284   int i;
 285
 286   for(i = 0; i < 64; in++){
 287     c = *in;
 288     for(j = 7; j >= 0; j--) {
 289       *out++ = (c >> j) & 01;
 290     }
 291     i += 8;
 292   }
 293 }
 294
 295 /* The inverse of Expand
 296  */
 297 static void
 298 Collapse(u_char *in, u_char *out)
 299 {
 300   int j;
 301   int i;
 302   unsigned int c;
 303
 304   for (i = 0; i < 64; i += 8, out++) {
 305     c = 0;
 306     for (j = 7; j >= 0; j--, in++) {
 307       c |= *in << j;
 308     }
 309     *out = c & 0xff;
 310   }
 311 }
 312 #endif
 313
 314 static void
 315 MakeKey( u_char *key,    /* IN  56 bit DES key missing parity bits */
 316          u_char *des_key /* OUT 64 bit DES key with parity bits added */)
 317 {
 318   des_key[0] = Get7Bits(key,  0);
 319   des_key[1] = Get7Bits(key,  7);
 320   des_key[2] = Get7Bits(key, 14);
 321   des_key[3] = Get7Bits(key, 21);
 322   des_key[4] = Get7Bits(key, 28);
 323   des_key[5] = Get7Bits(key, 35);
 324   des_key[6] = Get7Bits(key, 42);
 325   des_key[7] = Get7Bits(key, 49);
 326
 327 #ifndef USE_CRYPT
 328   des_set_odd_parity((des_cblock *)des_key);
 329 #endif
 330
 331 #if 0
 332   CHAPDEBUG((LOG_INFO, "MakeKey: 56-bit input : %02X%02X%02X%02X%02X%02X%02X\n",
 333              key[0], key[1], key[2], key[3], key[4], key[5], key[6]));
 334   CHAPDEBUG((LOG_INFO, "MakeKey: 64-bit output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
 335              des_key[0], des_key[1], des_key[2], des_key[3], des_key[4], des_key[5], des_key[6], des_key[7]));
 336 #endif
 337 }
 338
 339 static void
 340 ChapMS_NT( char *rchallenge,
 341            int rchallenge_len,
 342            char *secret,
 343            int secret_len,
 344            MS_ChapResponse *response)
 345 {
 346   int      i;
 347   MDstruct  md4Context;
 348   u_char    unicodePassword[MAX_NT_PASSWORD * 2];
 349   static int  low_byte_first = -1;
 350
 351   /* Initialize the Unicode version of the secret (== password). */
 352   /* This implicitly supports 8-bit ISO8859/1 characters. */
 353   BZERO(unicodePassword, sizeof(unicodePassword));
 354   for (i = 0; i < secret_len; i++) {
 355     unicodePassword[i * 2] = (u_char)secret[i];
 356   }
 357   MDbegin(&md4Context);
 358   MDupdate(&md4Context, unicodePassword, secret_len * 2 * 8);  /* Unicode is 2 bytes/char, *8 for bit count */
 359
 360   if (low_byte_first == -1) {
 361     low_byte_first = (htons((unsigned short int)1) != 1);
 362   }
 363   if (low_byte_first == 0) {
 364     MDreverse((u_long *)&md4Context);  /*  sfb 961105 */
 365   }
 366
 367   MDupdate(&md4Context, NULL, 0);  /* Tell MD4 we're done */
 368
 369   ChallengeResponse(rchallenge, (char *)md4Context.buffer, response->NTResp);
 370 }
 371
 372 #ifdef MSLANMAN
 373 static u_char *StdText = (u_char *)"KGS!@#$%"; /* key from rasapi32.dll */
 374
 375 static void
 376 ChapMS_LANMan( char *rchallenge,
 377                int rchallenge_len,
 378                char *secret,
 379                int secret_len,
 380                MS_ChapResponse  *response)
 381 {
 382   int      i;
 383   u_char    UcasePassword[MAX_NT_PASSWORD]; /* max is actually 14 */
 384   u_char    PasswordHash[16];
 385
 386   /* LANMan password is case insensitive */
 387   BZERO(UcasePassword, sizeof(UcasePassword));
 388   for (i = 0; i < secret_len; i++) {
 389     UcasePassword[i] = (u_char)toupper(secret[i]);
 390   }
 391   DesEncrypt( StdText, UcasePassword + 0, PasswordHash + 0 );
 392   DesEncrypt( StdText, UcasePassword + 7, PasswordHash + 8 );
 393   ChallengeResponse(rchallenge, PasswordHash, response->LANManResp);
 394 }
 395 #endif
 396
 397 #endif /* MSCHAP_SUPPORT */
 398
 399 #endif /* PPP_SUPPORT */