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lwip/netif/ppp/chpms.c@0:d7bd7384a37c, 2016-12-07 (annotated)

Committer:
grzemich
Date:
Wed Dec 07 23:47:50 2016 +0000
Revision:
0:d7bd7384a37c
dgd

Who changed what in which revision?

UserRevisionLine numberNew contents of line
grzemich 0:d7bd7384a37c 1 /*** WARNING - THIS CODE HAS NOT BEEN FINISHED! ***/
grzemich 0:d7bd7384a37c 2 /*** The original PPPD code is written in a way to require either the UNIX DES
grzemich 0:d7bd7384a37c 3 encryption functions encrypt(3) and setkey(3) or the DES library libdes.
grzemich 0:d7bd7384a37c 4 Since both is not included in lwIP, MSCHAP currently does not work! */
grzemich 0:d7bd7384a37c 5 /*****************************************************************************
grzemich 0:d7bd7384a37c 6 * chpms.c - Network MicroSoft Challenge Handshake Authentication Protocol program file.
grzemich 0:d7bd7384a37c 7 *
grzemich 0:d7bd7384a37c 8 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
grzemich 0:d7bd7384a37c 9 * Copyright (c) 1997 by Global Election Systems Inc. All rights reserved.
grzemich 0:d7bd7384a37c 10 *
grzemich 0:d7bd7384a37c 11 * The authors hereby grant permission to use, copy, modify, distribute,
grzemich 0:d7bd7384a37c 12 * and license this software and its documentation for any purpose, provided
grzemich 0:d7bd7384a37c 13 * that existing copyright notices are retained in all copies and that this
grzemich 0:d7bd7384a37c 14 * notice and the following disclaimer are included verbatim in any
grzemich 0:d7bd7384a37c 15 * distributions. No written agreement, license, or royalty fee is required
grzemich 0:d7bd7384a37c 16 * for any of the authorized uses.
grzemich 0:d7bd7384a37c 17 *
grzemich 0:d7bd7384a37c 18 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
grzemich 0:d7bd7384a37c 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
grzemich 0:d7bd7384a37c 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
grzemich 0:d7bd7384a37c 21 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
grzemich 0:d7bd7384a37c 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
grzemich 0:d7bd7384a37c 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
grzemich 0:d7bd7384a37c 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
grzemich 0:d7bd7384a37c 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
grzemich 0:d7bd7384a37c 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
grzemich 0:d7bd7384a37c 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
grzemich 0:d7bd7384a37c 28 *
grzemich 0:d7bd7384a37c 29 ******************************************************************************
grzemich 0:d7bd7384a37c 30 * REVISION HISTORY
grzemich 0:d7bd7384a37c 31 *
grzemich 0:d7bd7384a37c 32 * 03-01-01 Marc Boucher <marc@mbsi.ca>
grzemich 0:d7bd7384a37c 33 * Ported to lwIP.
grzemich 0:d7bd7384a37c 34 * 97-12-08 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
grzemich 0:d7bd7384a37c 35 * Original based on BSD chap_ms.c.
grzemich 0:d7bd7384a37c 36 *****************************************************************************/
grzemich 0:d7bd7384a37c 37 /*
grzemich 0:d7bd7384a37c 38 * chap_ms.c - Microsoft MS-CHAP compatible implementation.
grzemich 0:d7bd7384a37c 39 *
grzemich 0:d7bd7384a37c 40 * Copyright (c) 1995 Eric Rosenquist, Strata Software Limited.
grzemich 0:d7bd7384a37c 41 * http://www.strataware.com/
grzemich 0:d7bd7384a37c 42 *
grzemich 0:d7bd7384a37c 43 * All rights reserved.
grzemich 0:d7bd7384a37c 44 *
grzemich 0:d7bd7384a37c 45 * Redistribution and use in source and binary forms are permitted
grzemich 0:d7bd7384a37c 46 * provided that the above copyright notice and this paragraph are
grzemich 0:d7bd7384a37c 47 * duplicated in all such forms and that any documentation,
grzemich 0:d7bd7384a37c 48 * advertising materials, and other materials related to such
grzemich 0:d7bd7384a37c 49 * distribution and use acknowledge that the software was developed
grzemich 0:d7bd7384a37c 50 * by Eric Rosenquist. The name of the author may not be used to
grzemich 0:d7bd7384a37c 51 * endorse or promote products derived from this software without
grzemich 0:d7bd7384a37c 52 * specific prior written permission.
grzemich 0:d7bd7384a37c 53 *
grzemich 0:d7bd7384a37c 54 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
grzemich 0:d7bd7384a37c 55 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
grzemich 0:d7bd7384a37c 56 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
grzemich 0:d7bd7384a37c 57 */
grzemich 0:d7bd7384a37c 58
grzemich 0:d7bd7384a37c 59 /*
grzemich 0:d7bd7384a37c 60 * Modifications by Lauri Pesonen / lpesonen@clinet.fi, april 1997
grzemich 0:d7bd7384a37c 61 *
grzemich 0:d7bd7384a37c 62 * Implemented LANManager type password response to MS-CHAP challenges.
grzemich 0:d7bd7384a37c 63 * Now pppd provides both NT style and LANMan style blocks, and the
grzemich 0:d7bd7384a37c 64 * prefered is set by option "ms-lanman". Default is to use NT.
grzemich 0:d7bd7384a37c 65 * The hash text (StdText) was taken from Win95 RASAPI32.DLL.
grzemich 0:d7bd7384a37c 66 *
grzemich 0:d7bd7384a37c 67 * You should also use DOMAIN\\USERNAME as described in README.MSCHAP80
grzemich 0:d7bd7384a37c 68 */
grzemich 0:d7bd7384a37c 69
grzemich 0:d7bd7384a37c 70 #define USE_CRYPT
grzemich 0:d7bd7384a37c 71
grzemich 0:d7bd7384a37c 72 #include "lwip/opt.h"
grzemich 0:d7bd7384a37c 73
grzemich 0:d7bd7384a37c 74 #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
grzemich 0:d7bd7384a37c 75
grzemich 0:d7bd7384a37c 76 #if MSCHAP_SUPPORT /* don't build if not configured for use in lwipopts.h */
grzemich 0:d7bd7384a37c 77
grzemich 0:d7bd7384a37c 78 #include "ppp.h"
grzemich 0:d7bd7384a37c 79 #include "pppdebug.h"
grzemich 0:d7bd7384a37c 80
grzemich 0:d7bd7384a37c 81 #include "md4.h"
grzemich 0:d7bd7384a37c 82 #ifndef USE_CRYPT
grzemich 0:d7bd7384a37c 83 #include "des.h"
grzemich 0:d7bd7384a37c 84 #endif
grzemich 0:d7bd7384a37c 85 #include "chap.h"
grzemich 0:d7bd7384a37c 86 #include "chpms.h"
grzemich 0:d7bd7384a37c 87
grzemich 0:d7bd7384a37c 88 #include <string.h>
grzemich 0:d7bd7384a37c 89
grzemich 0:d7bd7384a37c 90
grzemich 0:d7bd7384a37c 91 /*************************/
grzemich 0:d7bd7384a37c 92 /*** LOCAL DEFINITIONS ***/
grzemich 0:d7bd7384a37c 93 /*************************/
grzemich 0:d7bd7384a37c 94
grzemich 0:d7bd7384a37c 95
grzemich 0:d7bd7384a37c 96 /************************/
grzemich 0:d7bd7384a37c 97 /*** LOCAL DATA TYPES ***/
grzemich 0:d7bd7384a37c 98 /************************/
grzemich 0:d7bd7384a37c 99 typedef struct {
grzemich 0:d7bd7384a37c 100 u_char LANManResp[24];
grzemich 0:d7bd7384a37c 101 u_char NTResp[24];
grzemich 0:d7bd7384a37c 102 u_char UseNT; /* If 1, ignore the LANMan response field */
grzemich 0:d7bd7384a37c 103 } MS_ChapResponse;
grzemich 0:d7bd7384a37c 104 /* We use MS_CHAP_RESPONSE_LEN, rather than sizeof(MS_ChapResponse),
grzemich 0:d7bd7384a37c 105 in case this struct gets padded. */
grzemich 0:d7bd7384a37c 106
grzemich 0:d7bd7384a37c 107
grzemich 0:d7bd7384a37c 108
grzemich 0:d7bd7384a37c 109 /***********************************/
grzemich 0:d7bd7384a37c 110 /*** LOCAL FUNCTION DECLARATIONS ***/
grzemich 0:d7bd7384a37c 111 /***********************************/
grzemich 0:d7bd7384a37c 112
grzemich 0:d7bd7384a37c 113 /* XXX Don't know what to do with these. */
grzemich 0:d7bd7384a37c 114 extern void setkey(const char *);
grzemich 0:d7bd7384a37c 115 extern void encrypt(char *, int);
grzemich 0:d7bd7384a37c 116
grzemich 0:d7bd7384a37c 117 static void DesEncrypt (u_char *, u_char *, u_char *);
grzemich 0:d7bd7384a37c 118 static void MakeKey (u_char *, u_char *);
grzemich 0:d7bd7384a37c 119
grzemich 0:d7bd7384a37c 120 #ifdef USE_CRYPT
grzemich 0:d7bd7384a37c 121 static void Expand (u_char *, u_char *);
grzemich 0:d7bd7384a37c 122 static void Collapse (u_char *, u_char *);
grzemich 0:d7bd7384a37c 123 #endif
grzemich 0:d7bd7384a37c 124
grzemich 0:d7bd7384a37c 125 static void ChallengeResponse(
grzemich 0:d7bd7384a37c 126 u_char *challenge, /* IN 8 octets */
grzemich 0:d7bd7384a37c 127 u_char *pwHash, /* IN 16 octets */
grzemich 0:d7bd7384a37c 128 u_char *response /* OUT 24 octets */
grzemich 0:d7bd7384a37c 129 );
grzemich 0:d7bd7384a37c 130 static void ChapMS_NT(
grzemich 0:d7bd7384a37c 131 char *rchallenge,
grzemich 0:d7bd7384a37c 132 int rchallenge_len,
grzemich 0:d7bd7384a37c 133 char *secret,
grzemich 0:d7bd7384a37c 134 int secret_len,
grzemich 0:d7bd7384a37c 135 MS_ChapResponse *response
grzemich 0:d7bd7384a37c 136 );
grzemich 0:d7bd7384a37c 137 static u_char Get7Bits(
grzemich 0:d7bd7384a37c 138 u_char *input,
grzemich 0:d7bd7384a37c 139 int startBit
grzemich 0:d7bd7384a37c 140 );
grzemich 0:d7bd7384a37c 141
grzemich 0:d7bd7384a37c 142 static void
grzemich 0:d7bd7384a37c 143 ChallengeResponse( u_char *challenge, /* IN 8 octets */
grzemich 0:d7bd7384a37c 144 u_char *pwHash, /* IN 16 octets */
grzemich 0:d7bd7384a37c 145 u_char *response /* OUT 24 octets */)
grzemich 0:d7bd7384a37c 146 {
grzemich 0:d7bd7384a37c 147 u_char ZPasswordHash[21];
grzemich 0:d7bd7384a37c 148
grzemich 0:d7bd7384a37c 149 BZERO(ZPasswordHash, sizeof(ZPasswordHash));
grzemich 0:d7bd7384a37c 150 BCOPY(pwHash, ZPasswordHash, 16);
grzemich 0:d7bd7384a37c 151
grzemich 0:d7bd7384a37c 152 #if 0
grzemich 0:d7bd7384a37c 153 log_packet(ZPasswordHash, sizeof(ZPasswordHash), "ChallengeResponse - ZPasswordHash", LOG_DEBUG);
grzemich 0:d7bd7384a37c 154 #endif
grzemich 0:d7bd7384a37c 155
grzemich 0:d7bd7384a37c 156 DesEncrypt(challenge, ZPasswordHash + 0, response + 0);
grzemich 0:d7bd7384a37c 157 DesEncrypt(challenge, ZPasswordHash + 7, response + 8);
grzemich 0:d7bd7384a37c 158 DesEncrypt(challenge, ZPasswordHash + 14, response + 16);
grzemich 0:d7bd7384a37c 159
grzemich 0:d7bd7384a37c 160 #if 0
grzemich 0:d7bd7384a37c 161 log_packet(response, 24, "ChallengeResponse - response", LOG_DEBUG);
grzemich 0:d7bd7384a37c 162 #endif
grzemich 0:d7bd7384a37c 163 }
grzemich 0:d7bd7384a37c 164
grzemich 0:d7bd7384a37c 165
grzemich 0:d7bd7384a37c 166 #ifdef USE_CRYPT
grzemich 0:d7bd7384a37c 167 static void
grzemich 0:d7bd7384a37c 168 DesEncrypt( u_char *clear, /* IN 8 octets */
grzemich 0:d7bd7384a37c 169 u_char *key, /* IN 7 octets */
grzemich 0:d7bd7384a37c 170 u_char *cipher /* OUT 8 octets */)
grzemich 0:d7bd7384a37c 171 {
grzemich 0:d7bd7384a37c 172 u_char des_key[8];
grzemich 0:d7bd7384a37c 173 u_char crypt_key[66];
grzemich 0:d7bd7384a37c 174 u_char des_input[66];
grzemich 0:d7bd7384a37c 175
grzemich 0:d7bd7384a37c 176 MakeKey(key, des_key);
grzemich 0:d7bd7384a37c 177
grzemich 0:d7bd7384a37c 178 Expand(des_key, crypt_key);
grzemich 0:d7bd7384a37c 179 setkey((char*)crypt_key);
grzemich 0:d7bd7384a37c 180
grzemich 0:d7bd7384a37c 181 #if 0
grzemich 0:d7bd7384a37c 182 CHAPDEBUG(LOG_INFO, ("DesEncrypt: 8 octet input : %02X%02X%02X%02X%02X%02X%02X%02X\n",
grzemich 0:d7bd7384a37c 183 clear[0], clear[1], clear[2], clear[3], clear[4], clear[5], clear[6], clear[7]));
grzemich 0:d7bd7384a37c 184 #endif
grzemich 0:d7bd7384a37c 185
grzemich 0:d7bd7384a37c 186 Expand(clear, des_input);
grzemich 0:d7bd7384a37c 187 encrypt((char*)des_input, 0);
grzemich 0:d7bd7384a37c 188 Collapse(des_input, cipher);
grzemich 0:d7bd7384a37c 189
grzemich 0:d7bd7384a37c 190 #if 0
grzemich 0:d7bd7384a37c 191 CHAPDEBUG(LOG_INFO, ("DesEncrypt: 8 octet output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
grzemich 0:d7bd7384a37c 192 cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));
grzemich 0:d7bd7384a37c 193 #endif
grzemich 0:d7bd7384a37c 194 }
grzemich 0:d7bd7384a37c 195
grzemich 0:d7bd7384a37c 196 #else /* USE_CRYPT */
grzemich 0:d7bd7384a37c 197
grzemich 0:d7bd7384a37c 198 static void
grzemich 0:d7bd7384a37c 199 DesEncrypt( u_char *clear, /* IN 8 octets */
grzemich 0:d7bd7384a37c 200 u_char *key, /* IN 7 octets */
grzemich 0:d7bd7384a37c 201 u_char *cipher /* OUT 8 octets */)
grzemich 0:d7bd7384a37c 202 {
grzemich 0:d7bd7384a37c 203 des_cblock des_key;
grzemich 0:d7bd7384a37c 204 des_key_schedule key_schedule;
grzemich 0:d7bd7384a37c 205
grzemich 0:d7bd7384a37c 206 MakeKey(key, des_key);
grzemich 0:d7bd7384a37c 207
grzemich 0:d7bd7384a37c 208 des_set_key(&des_key, key_schedule);
grzemich 0:d7bd7384a37c 209
grzemich 0:d7bd7384a37c 210 #if 0
grzemich 0:d7bd7384a37c 211 CHAPDEBUG(LOG_INFO, ("DesEncrypt: 8 octet input : %02X%02X%02X%02X%02X%02X%02X%02X\n",
grzemich 0:d7bd7384a37c 212 clear[0], clear[1], clear[2], clear[3], clear[4], clear[5], clear[6], clear[7]));
grzemich 0:d7bd7384a37c 213 #endif
grzemich 0:d7bd7384a37c 214
grzemich 0:d7bd7384a37c 215 des_ecb_encrypt((des_cblock *)clear, (des_cblock *)cipher, key_schedule, 1);
grzemich 0:d7bd7384a37c 216
grzemich 0:d7bd7384a37c 217 #if 0
grzemich 0:d7bd7384a37c 218 CHAPDEBUG(LOG_INFO, ("DesEncrypt: 8 octet output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
grzemich 0:d7bd7384a37c 219 cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));
grzemich 0:d7bd7384a37c 220 #endif
grzemich 0:d7bd7384a37c 221 }
grzemich 0:d7bd7384a37c 222
grzemich 0:d7bd7384a37c 223 #endif /* USE_CRYPT */
grzemich 0:d7bd7384a37c 224
grzemich 0:d7bd7384a37c 225
grzemich 0:d7bd7384a37c 226 static u_char
grzemich 0:d7bd7384a37c 227 Get7Bits( u_char *input, int startBit)
grzemich 0:d7bd7384a37c 228 {
grzemich 0:d7bd7384a37c 229 register unsigned int word;
grzemich 0:d7bd7384a37c 230
grzemich 0:d7bd7384a37c 231 word = (unsigned)input[startBit / 8] << 8;
grzemich 0:d7bd7384a37c 232 word |= (unsigned)input[startBit / 8 + 1];
grzemich 0:d7bd7384a37c 233
grzemich 0:d7bd7384a37c 234 word >>= 15 - (startBit % 8 + 7);
grzemich 0:d7bd7384a37c 235
grzemich 0:d7bd7384a37c 236 return word & 0xFE;
grzemich 0:d7bd7384a37c 237 }
grzemich 0:d7bd7384a37c 238
grzemich 0:d7bd7384a37c 239 #ifdef USE_CRYPT
grzemich 0:d7bd7384a37c 240
grzemich 0:d7bd7384a37c 241 /* in == 8-byte string (expanded version of the 56-bit key)
grzemich 0:d7bd7384a37c 242 * out == 64-byte string where each byte is either 1 or 0
grzemich 0:d7bd7384a37c 243 * Note that the low-order "bit" is always ignored by by setkey()
grzemich 0:d7bd7384a37c 244 */
grzemich 0:d7bd7384a37c 245 static void
grzemich 0:d7bd7384a37c 246 Expand(u_char *in, u_char *out)
grzemich 0:d7bd7384a37c 247 {
grzemich 0:d7bd7384a37c 248 int j, c;
grzemich 0:d7bd7384a37c 249 int i;
grzemich 0:d7bd7384a37c 250
grzemich 0:d7bd7384a37c 251 for(i = 0; i < 64; in++){
grzemich 0:d7bd7384a37c 252 c = *in;
grzemich 0:d7bd7384a37c 253 for(j = 7; j >= 0; j--) {
grzemich 0:d7bd7384a37c 254 *out++ = (c >> j) & 01;
grzemich 0:d7bd7384a37c 255 }
grzemich 0:d7bd7384a37c 256 i += 8;
grzemich 0:d7bd7384a37c 257 }
grzemich 0:d7bd7384a37c 258 }
grzemich 0:d7bd7384a37c 259
grzemich 0:d7bd7384a37c 260 /* The inverse of Expand
grzemich 0:d7bd7384a37c 261 */
grzemich 0:d7bd7384a37c 262 static void
grzemich 0:d7bd7384a37c 263 Collapse(u_char *in, u_char *out)
grzemich 0:d7bd7384a37c 264 {
grzemich 0:d7bd7384a37c 265 int j;
grzemich 0:d7bd7384a37c 266 int i;
grzemich 0:d7bd7384a37c 267 unsigned int c;
grzemich 0:d7bd7384a37c 268
grzemich 0:d7bd7384a37c 269 for (i = 0; i < 64; i += 8, out++) {
grzemich 0:d7bd7384a37c 270 c = 0;
grzemich 0:d7bd7384a37c 271 for (j = 7; j >= 0; j--, in++) {
grzemich 0:d7bd7384a37c 272 c |= *in << j;
grzemich 0:d7bd7384a37c 273 }
grzemich 0:d7bd7384a37c 274 *out = c & 0xff;
grzemich 0:d7bd7384a37c 275 }
grzemich 0:d7bd7384a37c 276 }
grzemich 0:d7bd7384a37c 277 #endif
grzemich 0:d7bd7384a37c 278
grzemich 0:d7bd7384a37c 279 static void
grzemich 0:d7bd7384a37c 280 MakeKey( u_char *key, /* IN 56 bit DES key missing parity bits */
grzemich 0:d7bd7384a37c 281 u_char *des_key /* OUT 64 bit DES key with parity bits added */)
grzemich 0:d7bd7384a37c 282 {
grzemich 0:d7bd7384a37c 283 des_key[0] = Get7Bits(key, 0);
grzemich 0:d7bd7384a37c 284 des_key[1] = Get7Bits(key, 7);
grzemich 0:d7bd7384a37c 285 des_key[2] = Get7Bits(key, 14);
grzemich 0:d7bd7384a37c 286 des_key[3] = Get7Bits(key, 21);
grzemich 0:d7bd7384a37c 287 des_key[4] = Get7Bits(key, 28);
grzemich 0:d7bd7384a37c 288 des_key[5] = Get7Bits(key, 35);
grzemich 0:d7bd7384a37c 289 des_key[6] = Get7Bits(key, 42);
grzemich 0:d7bd7384a37c 290 des_key[7] = Get7Bits(key, 49);
grzemich 0:d7bd7384a37c 291
grzemich 0:d7bd7384a37c 292 #ifndef USE_CRYPT
grzemich 0:d7bd7384a37c 293 des_set_odd_parity((des_cblock *)des_key);
grzemich 0:d7bd7384a37c 294 #endif
grzemich 0:d7bd7384a37c 295
grzemich 0:d7bd7384a37c 296 #if 0
grzemich 0:d7bd7384a37c 297 CHAPDEBUG(LOG_INFO, ("MakeKey: 56-bit input : %02X%02X%02X%02X%02X%02X%02X\n",
grzemich 0:d7bd7384a37c 298 key[0], key[1], key[2], key[3], key[4], key[5], key[6]));
grzemich 0:d7bd7384a37c 299 CHAPDEBUG(LOG_INFO, ("MakeKey: 64-bit output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
grzemich 0:d7bd7384a37c 300 des_key[0], des_key[1], des_key[2], des_key[3], des_key[4], des_key[5], des_key[6], des_key[7]));
grzemich 0:d7bd7384a37c 301 #endif
grzemich 0:d7bd7384a37c 302 }
grzemich 0:d7bd7384a37c 303
grzemich 0:d7bd7384a37c 304 static void
grzemich 0:d7bd7384a37c 305 ChapMS_NT( char *rchallenge,
grzemich 0:d7bd7384a37c 306 int rchallenge_len,
grzemich 0:d7bd7384a37c 307 char *secret,
grzemich 0:d7bd7384a37c 308 int secret_len,
grzemich 0:d7bd7384a37c 309 MS_ChapResponse *response)
grzemich 0:d7bd7384a37c 310 {
grzemich 0:d7bd7384a37c 311 int i;
grzemich 0:d7bd7384a37c 312 MDstruct md4Context;
grzemich 0:d7bd7384a37c 313 u_char unicodePassword[MAX_NT_PASSWORD * 2];
grzemich 0:d7bd7384a37c 314 static int low_byte_first = -1;
grzemich 0:d7bd7384a37c 315
grzemich 0:d7bd7384a37c 316 LWIP_UNUSED_ARG(rchallenge_len);
grzemich 0:d7bd7384a37c 317
grzemich 0:d7bd7384a37c 318 /* Initialize the Unicode version of the secret (== password). */
grzemich 0:d7bd7384a37c 319 /* This implicitly supports 8-bit ISO8859/1 characters. */
grzemich 0:d7bd7384a37c 320 BZERO(unicodePassword, sizeof(unicodePassword));
grzemich 0:d7bd7384a37c 321 for (i = 0; i < secret_len; i++) {
grzemich 0:d7bd7384a37c 322 unicodePassword[i * 2] = (u_char)secret[i];
grzemich 0:d7bd7384a37c 323 }
grzemich 0:d7bd7384a37c 324 MDbegin(&md4Context);
grzemich 0:d7bd7384a37c 325 MDupdate(&md4Context, unicodePassword, secret_len * 2 * 8); /* Unicode is 2 bytes/char, *8 for bit count */
grzemich 0:d7bd7384a37c 326
grzemich 0:d7bd7384a37c 327 if (low_byte_first == -1) {
grzemich 0:d7bd7384a37c 328 low_byte_first = (PP_HTONS((unsigned short int)1) != 1);
grzemich 0:d7bd7384a37c 329 }
grzemich 0:d7bd7384a37c 330 if (low_byte_first == 0) {
grzemich 0:d7bd7384a37c 331 /* @todo: arg type - u_long* or u_int* ? */
grzemich 0:d7bd7384a37c 332 MDreverse((unsigned int*)&md4Context); /* sfb 961105 */
grzemich 0:d7bd7384a37c 333 }
grzemich 0:d7bd7384a37c 334
grzemich 0:d7bd7384a37c 335 MDupdate(&md4Context, NULL, 0); /* Tell MD4 we're done */
grzemich 0:d7bd7384a37c 336
grzemich 0:d7bd7384a37c 337 ChallengeResponse((u_char*)rchallenge, (u_char*)md4Context.buffer, response->NTResp);
grzemich 0:d7bd7384a37c 338 }
grzemich 0:d7bd7384a37c 339
grzemich 0:d7bd7384a37c 340 #ifdef MSLANMAN
grzemich 0:d7bd7384a37c 341 static u_char *StdText = (u_char *)"KGS!@#$%"; /* key from rasapi32.dll */
grzemich 0:d7bd7384a37c 342
grzemich 0:d7bd7384a37c 343 static void
grzemich 0:d7bd7384a37c 344 ChapMS_LANMan( char *rchallenge,
grzemich 0:d7bd7384a37c 345 int rchallenge_len,
grzemich 0:d7bd7384a37c 346 char *secret,
grzemich 0:d7bd7384a37c 347 int secret_len,
grzemich 0:d7bd7384a37c 348 MS_ChapResponse *response)
grzemich 0:d7bd7384a37c 349 {
grzemich 0:d7bd7384a37c 350 int i;
grzemich 0:d7bd7384a37c 351 u_char UcasePassword[MAX_NT_PASSWORD]; /* max is actually 14 */
grzemich 0:d7bd7384a37c 352 u_char PasswordHash[16];
grzemich 0:d7bd7384a37c 353
grzemich 0:d7bd7384a37c 354 /* LANMan password is case insensitive */
grzemich 0:d7bd7384a37c 355 BZERO(UcasePassword, sizeof(UcasePassword));
grzemich 0:d7bd7384a37c 356 for (i = 0; i < secret_len; i++) {
grzemich 0:d7bd7384a37c 357 UcasePassword[i] = (u_char)toupper(secret[i]);
grzemich 0:d7bd7384a37c 358 }
grzemich 0:d7bd7384a37c 359 DesEncrypt( StdText, UcasePassword + 0, PasswordHash + 0 );
grzemich 0:d7bd7384a37c 360 DesEncrypt( StdText, UcasePassword + 7, PasswordHash + 8 );
grzemich 0:d7bd7384a37c 361 ChallengeResponse(rchallenge, PasswordHash, response->LANManResp);
grzemich 0:d7bd7384a37c 362 }
grzemich 0:d7bd7384a37c 363 #endif
grzemich 0:d7bd7384a37c 364
grzemich 0:d7bd7384a37c 365 void
grzemich 0:d7bd7384a37c 366 ChapMS( chap_state *cstate, char *rchallenge, int rchallenge_len, char *secret, int secret_len)
grzemich 0:d7bd7384a37c 367 {
grzemich 0:d7bd7384a37c 368 MS_ChapResponse response;
grzemich 0:d7bd7384a37c 369 #ifdef MSLANMAN
grzemich 0:d7bd7384a37c 370 extern int ms_lanman;
grzemich 0:d7bd7384a37c 371 #endif
grzemich 0:d7bd7384a37c 372
grzemich 0:d7bd7384a37c 373 #if 0
grzemich 0:d7bd7384a37c 374 CHAPDEBUG(LOG_INFO, ("ChapMS: secret is '%.*s'\n", secret_len, secret));
grzemich 0:d7bd7384a37c 375 #endif
grzemich 0:d7bd7384a37c 376 BZERO(&response, sizeof(response));
grzemich 0:d7bd7384a37c 377
grzemich 0:d7bd7384a37c 378 /* Calculate both always */
grzemich 0:d7bd7384a37c 379 ChapMS_NT(rchallenge, rchallenge_len, secret, secret_len, &response);
grzemich 0:d7bd7384a37c 380
grzemich 0:d7bd7384a37c 381 #ifdef MSLANMAN
grzemich 0:d7bd7384a37c 382 ChapMS_LANMan(rchallenge, rchallenge_len, secret, secret_len, &response);
grzemich 0:d7bd7384a37c 383
grzemich 0:d7bd7384a37c 384 /* prefered method is set by option */
grzemich 0:d7bd7384a37c 385 response.UseNT = !ms_lanman;
grzemich 0:d7bd7384a37c 386 #else
grzemich 0:d7bd7384a37c 387 response.UseNT = 1;
grzemich 0:d7bd7384a37c 388 #endif
grzemich 0:d7bd7384a37c 389
grzemich 0:d7bd7384a37c 390 BCOPY(&response, cstate->response, MS_CHAP_RESPONSE_LEN);
grzemich 0:d7bd7384a37c 391 cstate->resp_length = MS_CHAP_RESPONSE_LEN;
grzemich 0:d7bd7384a37c 392 }
grzemich 0:d7bd7384a37c 393
grzemich 0:d7bd7384a37c 394 #endif /* MSCHAP_SUPPORT */
grzemich 0:d7bd7384a37c 395
grzemich 0:d7bd7384a37c 396 #endif /* PPP_SUPPORT */