1 /*** WARNING - THIS CODE HAS NOT BEEN FINISHED! ***/
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2 /*****************************************************************************
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3 * chpms.c - Network MicroSoft Challenge Handshake Authentication Protocol program file.
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5 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
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6 * Copyright (c) 1997 by Global Election Systems Inc. All rights reserved.
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8 * The authors hereby grant permission to use, copy, modify, distribute,
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9 * and license this software and its documentation for any purpose, provided
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10 * that existing copyright notices are retained in all copies and that this
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11 * notice and the following disclaimer are included verbatim in any
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12 * distributions. No written agreement, license, or royalty fee is required
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13 * for any of the authorized uses.
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15 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
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16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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18 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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26 ******************************************************************************
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29 * 03-01-01 Marc Boucher <marc@mbsi.ca>
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31 * 97-12-08 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
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32 * Original based on BSD chap_ms.c.
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33 *****************************************************************************/
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35 * chap_ms.c - Microsoft MS-CHAP compatible implementation.
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37 * Copyright (c) 1995 Eric Rosenquist, Strata Software Limited.
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38 * http://www.strataware.com/
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40 * All rights reserved.
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42 * Redistribution and use in source and binary forms are permitted
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43 * provided that the above copyright notice and this paragraph are
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44 * duplicated in all such forms and that any documentation,
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45 * advertising materials, and other materials related to such
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46 * distribution and use acknowledge that the software was developed
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47 * by Eric Rosenquist. The name of the author may not be used to
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48 * endorse or promote products derived from this software without
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49 * specific prior written permission.
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51 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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52 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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53 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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57 * Modifications by Lauri Pesonen / lpesonen@clinet.fi, april 1997
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59 * Implemented LANManager type password response to MS-CHAP challenges.
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60 * Now pppd provides both NT style and LANMan style blocks, and the
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61 * prefered is set by option "ms-lanman". Default is to use NT.
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62 * The hash text (StdText) was taken from Win95 RASAPI32.DLL.
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64 * You should also use DOMAIN\\USERNAME as described in README.MSCHAP80
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69 #include "lwip/opt.h"
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71 #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
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73 #if MSCHAP_SUPPORT /* don't build if not configured for use in lwipopts.h */
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76 #include "pppdebug.h"
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86 /*************************/
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87 /*** LOCAL DEFINITIONS ***/
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88 /*************************/
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91 /************************/
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92 /*** LOCAL DATA TYPES ***/
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93 /************************/
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95 u_char LANManResp[24];
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97 u_char UseNT; /* If 1, ignore the LANMan response field */
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99 /* We use MS_CHAP_RESPONSE_LEN, rather than sizeof(MS_ChapResponse),
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100 in case this struct gets padded. */
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104 /***********************************/
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105 /*** LOCAL FUNCTION DECLARATIONS ***/
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106 /***********************************/
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108 /* XXX Don't know what to do with these. */
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109 extern void setkey(const char *);
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110 extern void encrypt(char *, int);
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112 static void DesEncrypt (u_char *, u_char *, u_char *);
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113 static void MakeKey (u_char *, u_char *);
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116 static void Expand (u_char *, u_char *);
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117 static void Collapse (u_char *, u_char *);
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120 static void ChallengeResponse(
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121 u_char *challenge, /* IN 8 octets */
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122 u_char *pwHash, /* IN 16 octets */
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123 u_char *response /* OUT 24 octets */
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125 static void ChapMS_NT(
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127 int rchallenge_len,
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130 MS_ChapResponse *response
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132 static u_char Get7Bits(
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138 /***********************************/
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139 /*** PUBLIC FUNCTION DEFINITIONS ***/
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140 /***********************************/
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142 ChapMS( chap_state *cstate, char *rchallenge, int rchallenge_len, char *secret, int secret_len)
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144 MS_ChapResponse response;
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146 extern int ms_lanman;
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150 CHAPDEBUG((LOG_INFO, "ChapMS: secret is '%.*s'\n", secret_len, secret));
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152 BZERO(&response, sizeof(response));
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154 /* Calculate both always */
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155 ChapMS_NT(rchallenge, rchallenge_len, secret, secret_len, &response);
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158 ChapMS_LANMan(rchallenge, rchallenge_len, secret, secret_len, &response);
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160 /* prefered method is set by option */
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161 response.UseNT = !ms_lanman;
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163 response.UseNT = 1;
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166 BCOPY(&response, cstate->response, MS_CHAP_RESPONSE_LEN);
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167 cstate->resp_length = MS_CHAP_RESPONSE_LEN;
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171 /**********************************/
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172 /*** LOCAL FUNCTION DEFINITIONS ***/
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173 /**********************************/
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175 ChallengeResponse( u_char *challenge, /* IN 8 octets */
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176 u_char *pwHash, /* IN 16 octets */
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177 u_char *response /* OUT 24 octets */)
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179 char ZPasswordHash[21];
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181 BZERO(ZPasswordHash, sizeof(ZPasswordHash));
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182 BCOPY(pwHash, ZPasswordHash, 16);
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185 log_packet(ZPasswordHash, sizeof(ZPasswordHash), "ChallengeResponse - ZPasswordHash", LOG_DEBUG);
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188 DesEncrypt(challenge, ZPasswordHash + 0, response + 0);
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189 DesEncrypt(challenge, ZPasswordHash + 7, response + 8);
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190 DesEncrypt(challenge, ZPasswordHash + 14, response + 16);
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193 log_packet(response, 24, "ChallengeResponse - response", LOG_DEBUG);
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200 DesEncrypt( u_char *clear, /* IN 8 octets */
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201 u_char *key, /* IN 7 octets */
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202 u_char *cipher /* OUT 8 octets */)
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205 u_char crypt_key[66];
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206 u_char des_input[66];
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208 MakeKey(key, des_key);
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210 Expand(des_key, crypt_key);
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214 CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet input : %02X%02X%02X%02X%02X%02X%02X%02X\n",
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215 clear[0], clear[1], clear[2], clear[3], clear[4], clear[5], clear[6], clear[7]));
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218 Expand(clear, des_input);
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219 encrypt(des_input, 0);
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220 Collapse(des_input, cipher);
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223 CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
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224 cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));
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228 #else /* USE_CRYPT */
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231 DesEncrypt( u_char *clear, /* IN 8 octets */
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232 u_char *key, /* IN 7 octets */
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233 u_char *cipher /* OUT 8 octets */)
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235 des_cblock des_key;
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236 des_key_schedule key_schedule;
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238 MakeKey(key, des_key);
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240 des_set_key(&des_key, key_schedule);
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243 CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet input : %02X%02X%02X%02X%02X%02X%02X%02X\n",
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244 clear[0], clear[1], clear[2], clear[3], clear[4], clear[5], clear[6], clear[7]));
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247 des_ecb_encrypt((des_cblock *)clear, (des_cblock *)cipher, key_schedule, 1);
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250 CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
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251 cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));
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255 #endif /* USE_CRYPT */
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259 Get7Bits( u_char *input, int startBit)
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261 register unsigned int word;
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263 word = (unsigned)input[startBit / 8] << 8;
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264 word |= (unsigned)input[startBit / 8 + 1];
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266 word >>= 15 - (startBit % 8 + 7);
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268 return word & 0xFE;
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273 /* in == 8-byte string (expanded version of the 56-bit key)
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274 * out == 64-byte string where each byte is either 1 or 0
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275 * Note that the low-order "bit" is always ignored by by setkey()
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278 Expand(u_char *in, u_char *out)
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283 for(i = 0; i < 64; in++){
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285 for(j = 7; j >= 0; j--) {
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286 *out++ = (c >> j) & 01;
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292 /* The inverse of Expand
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295 Collapse(u_char *in, u_char *out)
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301 for (i = 0; i < 64; i += 8, out++) {
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303 for (j = 7; j >= 0; j--, in++) {
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312 MakeKey( u_char *key, /* IN 56 bit DES key missing parity bits */
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313 u_char *des_key /* OUT 64 bit DES key with parity bits added */)
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315 des_key[0] = Get7Bits(key, 0);
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316 des_key[1] = Get7Bits(key, 7);
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317 des_key[2] = Get7Bits(key, 14);
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318 des_key[3] = Get7Bits(key, 21);
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319 des_key[4] = Get7Bits(key, 28);
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320 des_key[5] = Get7Bits(key, 35);
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321 des_key[6] = Get7Bits(key, 42);
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322 des_key[7] = Get7Bits(key, 49);
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325 des_set_odd_parity((des_cblock *)des_key);
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329 CHAPDEBUG((LOG_INFO, "MakeKey: 56-bit input : %02X%02X%02X%02X%02X%02X%02X\n",
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330 key[0], key[1], key[2], key[3], key[4], key[5], key[6]));
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331 CHAPDEBUG((LOG_INFO, "MakeKey: 64-bit output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
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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]));
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337 ChapMS_NT( char *rchallenge,
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338 int rchallenge_len,
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341 MS_ChapResponse *response)
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344 MDstruct md4Context;
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345 u_char unicodePassword[MAX_NT_PASSWORD * 2];
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346 static int low_byte_first = -1;
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348 /* Initialize the Unicode version of the secret (== password). */
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349 /* This implicitly supports 8-bit ISO8859/1 characters. */
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350 BZERO(unicodePassword, sizeof(unicodePassword));
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351 for (i = 0; i < secret_len; i++) {
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352 unicodePassword[i * 2] = (u_char)secret[i];
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354 MDbegin(&md4Context);
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355 MDupdate(&md4Context, unicodePassword, secret_len * 2 * 8); /* Unicode is 2 bytes/char, *8 for bit count */
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357 if (low_byte_first == -1) {
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358 low_byte_first = (htons((unsigned short int)1) != 1);
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360 if (low_byte_first == 0) {
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361 MDreverse((u_long *)&md4Context); /* sfb 961105 */
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364 MDupdate(&md4Context, NULL, 0); /* Tell MD4 we're done */
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366 ChallengeResponse(rchallenge, (char *)md4Context.buffer, response->NTResp);
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370 static u_char *StdText = (u_char *)"KGS!@#$%"; /* key from rasapi32.dll */
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373 ChapMS_LANMan( char *rchallenge,
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374 int rchallenge_len,
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377 MS_ChapResponse *response)
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380 u_char UcasePassword[MAX_NT_PASSWORD]; /* max is actually 14 */
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381 u_char PasswordHash[16];
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383 /* LANMan password is case insensitive */
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384 BZERO(UcasePassword, sizeof(UcasePassword));
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385 for (i = 0; i < secret_len; i++) {
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386 UcasePassword[i] = (u_char)toupper(secret[i]);
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388 DesEncrypt( StdText, UcasePassword + 0, PasswordHash + 0 );
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389 DesEncrypt( StdText, UcasePassword + 7, PasswordHash + 8 );
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390 ChallengeResponse(rchallenge, PasswordHash, response->LANManResp);
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394 #endif /* MSCHAP_SUPPORT */
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396 #endif /* PPP_SUPPORT */
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