2 * Copyright (c) 1997 Gabor Kincses <gabor@acm.org>
3 * 1997 - 2001 Brian Somers <brian@Awfulhak.org>
4 * based on work by Eric Rosenquist
5 * Strata Software Limited.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * $FreeBSD: src/usr.sbin/ppp/chap_ms.c,v 1.9.2.6 2002/09/01 02:12:23 brian Exp $
30 * $DragonFly: src/usr.sbin/ppp/chap_ms.c,v 1.4 2004/03/27 01:39:13 cpressey Exp $
35 #include <openssl/des.h>
38 #include <sys/types.h>
41 #include <openssl/des.h>
45 #include <openssl/sha.h>
53 * Documentation & specifications:
55 * MS-CHAP (CHAP80) rfc2433
56 * MS-CHAP-V2 (CHAP81) rfc2759
57 * MPPE key management draft-ietf-pppext-mppe-keys-02.txt
60 static char SHA1_Pad1[40] =
61 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
62 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
63 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
64 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
66 static char SHA1_Pad2[40] =
67 {0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2,
68 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2,
69 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2,
70 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2};
72 /* unused, for documentation only */
73 /* only NTResp is filled in for FreeBSD */
74 struct MS_ChapResponse {
75 u_char LANManResp[24];
77 u_char UseNT; /* If 1, ignore the LANMan response field */
81 Get7Bits(u_char *input, int startBit)
85 word = (unsigned)input[startBit / 8] << 8;
86 word |= (unsigned)input[startBit / 8 + 1];
88 word >>= 15 - (startBit % 8 + 7);
93 /* IN 56 bit DES key missing parity bits
94 OUT 64 bit DES key with parity bits added */
96 MakeKey(u_char *key, u_char *des_key)
98 des_key[0] = Get7Bits(key, 0);
99 des_key[1] = Get7Bits(key, 7);
100 des_key[2] = Get7Bits(key, 14);
101 des_key[3] = Get7Bits(key, 21);
102 des_key[4] = Get7Bits(key, 28);
103 des_key[5] = Get7Bits(key, 35);
104 des_key[6] = Get7Bits(key, 42);
105 des_key[7] = Get7Bits(key, 49);
107 des_set_odd_parity((des_cblock *)des_key);
110 static void /* IN 8 octets IN 7 octest OUT 8 octets */
111 DesEncrypt(u_char *clear, u_char *key, u_char *cipher)
114 des_key_schedule key_schedule;
116 MakeKey(key, des_key);
117 des_set_key(&des_key, key_schedule);
118 des_ecb_encrypt((des_cblock *)clear, (des_cblock *)cipher, key_schedule, 1);
121 static void /* IN 8 octets IN 16 octets OUT 24 octets */
122 ChallengeResponse(u_char *challenge, u_char *pwHash, u_char *response)
124 char ZPasswordHash[21];
126 memset(ZPasswordHash, '\0', sizeof ZPasswordHash);
127 memcpy(ZPasswordHash, pwHash, 16);
129 DesEncrypt(challenge, ZPasswordHash + 0, response + 0);
130 DesEncrypt(challenge, ZPasswordHash + 7, response + 8);
131 DesEncrypt(challenge, ZPasswordHash + 14, response + 16);
135 NtPasswordHash(char *key, int keylen, char *hash)
139 MD4Init(&MD4context);
140 MD4Update(&MD4context, key, keylen);
141 MD4Final(hash, &MD4context);
145 HashNtPasswordHash(char *hash, char *hashhash)
149 MD4Init(&MD4context);
150 MD4Update(&MD4context, hash, 16);
151 MD4Final(hashhash, &MD4context);
155 ChallengeHash(char *PeerChallenge, char *AuthenticatorChallenge,
156 char *UserName, int UserNameLen, char *Challenge)
159 char Digest[SHA_DIGEST_LENGTH];
162 Name = strrchr(UserName, '\\');
170 SHA1_Update(&Context, PeerChallenge, 16);
171 SHA1_Update(&Context, AuthenticatorChallenge, 16);
172 SHA1_Update(&Context, Name, strlen(Name));
174 SHA1_Final(Digest, &Context);
175 memcpy(Challenge, Digest, 8);
179 GenerateNTResponse(char *AuthenticatorChallenge, char *PeerChallenge,
180 char *UserName, int UserNameLen, char *Password,
181 int PasswordLen, char *Response)
184 char PasswordHash[16];
186 ChallengeHash(PeerChallenge, AuthenticatorChallenge, UserName, UserNameLen,
188 NtPasswordHash(Password, PasswordLen, PasswordHash);
189 ChallengeResponse(Challenge, PasswordHash, Response);
192 #ifndef __DragonFly__
195 SHA1_End(SHA_CTX *ctx, char *buf)
198 unsigned char digest[LENGTH];
199 static const char hex[]="0123456789abcdef";
202 buf = malloc(2*LENGTH + 1);
205 SHA1_Final(digest, ctx);
206 for (i = 0; i < LENGTH; i++) {
207 buf[i+i] = hex[digest[i] >> 4];
208 buf[i+i+1] = hex[digest[i] & 0x0f];
216 GenerateAuthenticatorResponse(char *Password, int PasswordLen,
217 char *NTResponse, char *PeerChallenge,
218 char *AuthenticatorChallenge, char *UserName,
219 int UserNameLen, char *AuthenticatorResponse)
222 char PasswordHash[16];
223 char PasswordHashHash[16];
225 u_char Digest[SHA_DIGEST_LENGTH];
229 * "Magic" constants used in response generation
232 {0x4D, 0x61, 0x67, 0x69, 0x63, 0x20, 0x73, 0x65, 0x72, 0x76,
233 0x65, 0x72, 0x20, 0x74, 0x6F, 0x20, 0x63, 0x6C, 0x69, 0x65,
234 0x6E, 0x74, 0x20, 0x73, 0x69, 0x67, 0x6E, 0x69, 0x6E, 0x67,
235 0x20, 0x63, 0x6F, 0x6E, 0x73, 0x74, 0x61, 0x6E, 0x74};
239 {0x50, 0x61, 0x64, 0x20, 0x74, 0x6F, 0x20, 0x6D, 0x61, 0x6B,
240 0x65, 0x20, 0x69, 0x74, 0x20, 0x64, 0x6F, 0x20, 0x6D, 0x6F,
241 0x72, 0x65, 0x20, 0x74, 0x68, 0x61, 0x6E, 0x20, 0x6F, 0x6E,
242 0x65, 0x20, 0x69, 0x74, 0x65, 0x72, 0x61, 0x74, 0x69, 0x6F,
245 * Hash the password with MD4
247 NtPasswordHash(Password, PasswordLen, PasswordHash);
251 HashNtPasswordHash(PasswordHash, PasswordHashHash);
254 SHA1_Update(&Context, PasswordHashHash, 16);
255 SHA1_Update(&Context, NTResponse, 24);
256 SHA1_Update(&Context, Magic1, 39);
257 SHA1_Final(Digest, &Context);
258 ChallengeHash(PeerChallenge, AuthenticatorChallenge, UserName, UserNameLen,
261 SHA1_Update(&Context, Digest, 20);
262 SHA1_Update(&Context, Challenge, 8);
263 SHA1_Update(&Context, Magic2, 41);
266 * Encode the value of 'Digest' as "S=" followed by
267 * 40 ASCII hexadecimal digits and return it in
268 * AuthenticatorResponse.
270 * "S=0123456789ABCDEF0123456789ABCDEF01234567"
272 AuthenticatorResponse[0] = 'S';
273 AuthenticatorResponse[1] = '=';
274 SHA1_End(&Context, AuthenticatorResponse + 2);
276 AuthenticatorResponse[i] = toupper(AuthenticatorResponse[i]);
281 GetMasterKey(char *PasswordHashHash, char *NTResponse, char *MasterKey)
283 char Digest[SHA_DIGEST_LENGTH];
285 static char Magic1[27] =
286 {0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x74,
287 0x68, 0x65, 0x20, 0x4d, 0x50, 0x50, 0x45, 0x20, 0x4d,
288 0x61, 0x73, 0x74, 0x65, 0x72, 0x20, 0x4b, 0x65, 0x79};
291 SHA1_Update(&Context, PasswordHashHash, 16);
292 SHA1_Update(&Context, NTResponse, 24);
293 SHA1_Update(&Context, Magic1, 27);
294 SHA1_Final(Digest, &Context);
295 memcpy(MasterKey, Digest, 16);
299 GetAsymetricStartKey(char *MasterKey, char *SessionKey, int SessionKeyLength,
300 int IsSend, int IsServer)
302 char Digest[SHA_DIGEST_LENGTH];
306 static char Magic2[84] =
307 {0x4f, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x63, 0x6c, 0x69,
308 0x65, 0x6e, 0x74, 0x20, 0x73, 0x69, 0x64, 0x65, 0x2c, 0x20,
309 0x74, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x74, 0x68,
310 0x65, 0x20, 0x73, 0x65, 0x6e, 0x64, 0x20, 0x6b, 0x65, 0x79,
311 0x3b, 0x20, 0x6f, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x73,
312 0x65, 0x72, 0x76, 0x65, 0x72, 0x20, 0x73, 0x69, 0x64, 0x65,
313 0x2c, 0x20, 0x69, 0x74, 0x20, 0x69, 0x73, 0x20, 0x74, 0x68,
314 0x65, 0x20, 0x72, 0x65, 0x63, 0x65, 0x69, 0x76, 0x65, 0x20,
315 0x6b, 0x65, 0x79, 0x2e};
317 static char Magic3[84] =
318 {0x4f, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x63, 0x6c, 0x69,
319 0x65, 0x6e, 0x74, 0x20, 0x73, 0x69, 0x64, 0x65, 0x2c, 0x20,
320 0x74, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x74, 0x68,
321 0x65, 0x20, 0x72, 0x65, 0x63, 0x65, 0x69, 0x76, 0x65, 0x20,
322 0x6b, 0x65, 0x79, 0x3b, 0x20, 0x6f, 0x6e, 0x20, 0x74, 0x68,
323 0x65, 0x20, 0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x20, 0x73,
324 0x69, 0x64, 0x65, 0x2c, 0x20, 0x69, 0x74, 0x20, 0x69, 0x73,
325 0x20, 0x74, 0x68, 0x65, 0x20, 0x73, 0x65, 0x6e, 0x64, 0x20,
326 0x6b, 0x65, 0x79, 0x2e};
343 SHA1_Update(&Context, MasterKey, 16);
344 SHA1_Update(&Context, SHA1_Pad1, 40);
345 SHA1_Update(&Context, s, 84);
346 SHA1_Update(&Context, SHA1_Pad2, 40);
347 SHA1_Final(Digest, &Context);
349 memcpy(SessionKey, Digest, SessionKeyLength);
353 GetNewKeyFromSHA(char *StartKey, char *SessionKey, long SessionKeyLength,
357 char Digest[SHA_DIGEST_LENGTH];
360 SHA1_Update(&Context, StartKey, SessionKeyLength);
361 SHA1_Update(&Context, SHA1_Pad1, 40);
362 SHA1_Update(&Context, SessionKey, SessionKeyLength);
363 SHA1_Update(&Context, SHA1_Pad2, 40);
364 SHA1_Final(Digest, &Context);
366 memcpy(InterimKey, Digest, SessionKeyLength);
371 Get_Key(char *InitialSessionKey, char *CurrentSessionKey,
372 int LengthOfDesiredKey)
375 char Digest[SHA_DIGEST_LENGTH];
378 SHA1_Update(&Context, InitialSessionKey, LengthOfDesiredKey);
379 SHA1_Update(&Context, SHA1_Pad1, 40);
380 SHA1_Update(&Context, CurrentSessionKey, LengthOfDesiredKey);
381 SHA1_Update(&Context, SHA1_Pad2, 40);
382 SHA1_Final(Digest, &Context);
384 memcpy(CurrentSessionKey, Digest, LengthOfDesiredKey);
388 /* passwordHash 16-bytes MD4 hashed password
389 challenge 8-bytes peer CHAP challenge
390 since passwordHash is in a 24-byte buffer, response is written in there */
392 mschap_NT(char *passwordHash, char *challenge)
396 ChallengeResponse(challenge, passwordHash, response);
397 memcpy(passwordHash, response, 24);
398 passwordHash[24] = 1; /* NT-style response */
402 mschap_LANMan(char *digest, char *challenge, char *secret)
404 static u_char salt[] = "KGS!@#$%"; /* RASAPI32.dll */
405 char SECRET[14], *ptr, *end;
408 end = SECRET + sizeof SECRET;
409 for (ptr = SECRET; *secret && ptr < end; ptr++, secret++)
410 *ptr = toupper(*secret);
412 memset(ptr, '\0', end - ptr);
414 DesEncrypt(salt, SECRET, hash);
415 DesEncrypt(salt, SECRET + 7, hash + 8);
417 ChallengeResponse(challenge, hash, digest);