1 /*** WARNING - THIS CODE HAS NOT BEEN FINISHED! ***/
2 /*****************************************************************************
3 * chpms.c - Network MicroSoft Challenge Handshake Authentication Protocol program file.
5 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
6 * Copyright (c) 1997 by Global Election Systems Inc. All rights reserved.
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.
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.
26 ******************************************************************************
29 * 03-01-01 Marc Boucher <marc@mbsi.ca>
31 * 97-12-08 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
32 * Original based on BSD chap_ms.c.
33 *****************************************************************************/
35 * chap_ms.c - Microsoft MS-CHAP compatible implementation.
37 * Copyright (c) 1995 Eric Rosenquist, Strata Software Limited.
38 * http://www.strataware.com/
40 * All rights reserved.
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.
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.
57 * Modifications by Lauri Pesonen / lpesonen@clinet.fi, april 1997
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.
64 * You should also use DOMAIN\\USERNAME as described in README.MSCHAP80
72 #if MSCHAP_SUPPORT > 0
83 /*************************/
84 /*** LOCAL DEFINITIONS ***/
85 /*************************/
88 /************************/
89 /*** LOCAL DATA TYPES ***/
90 /************************/
92 u_char LANManResp[24];
94 u_char UseNT; /* If 1, ignore the LANMan response field */
96 /* We use MS_CHAP_RESPONSE_LEN, rather than sizeof(MS_ChapResponse),
97 in case this struct gets padded. */
101 /***********************************/
102 /*** LOCAL FUNCTION DECLARATIONS ***/
103 /***********************************/
105 /* XXX Don't know what to do with these. */
106 extern void setkey(const char *);
107 extern void encrypt(char *, int);
109 static void DesEncrypt (u_char *, u_char *, u_char *);
110 static void MakeKey (u_char *, u_char *);
113 static void Expand (u_char *, u_char *);
114 static void Collapse (u_char *, u_char *);
117 static void ChallengeResponse(
118 u_char *challenge, /* IN 8 octets */
119 u_char *pwHash, /* IN 16 octets */
120 u_char *response /* OUT 24 octets */
122 static void ChapMS_NT(
127 MS_ChapResponse *response
129 static u_char Get7Bits(
135 /***********************************/
136 /*** PUBLIC FUNCTION DEFINITIONS ***/
137 /***********************************/
146 MS_ChapResponse response;
148 extern int ms_lanman;
152 CHAPDEBUG((LOG_INFO, "ChapMS: secret is '%.*s'\n", secret_len, secret));
154 BZERO(&response, sizeof(response));
156 /* Calculate both always */
157 ChapMS_NT(rchallenge, rchallenge_len, secret, secret_len, &response);
160 ChapMS_LANMan(rchallenge, rchallenge_len, secret, secret_len, &response);
162 /* prefered method is set by option */
163 response.UseNT = !ms_lanman;
168 BCOPY(&response, cstate->response, MS_CHAP_RESPONSE_LEN);
169 cstate->resp_length = MS_CHAP_RESPONSE_LEN;
173 /**********************************/
174 /*** LOCAL FUNCTION DEFINITIONS ***/
175 /**********************************/
176 static void ChallengeResponse(
177 u_char *challenge, /* IN 8 octets */
178 u_char *pwHash, /* IN 16 octets */
179 u_char *response /* OUT 24 octets */
182 char ZPasswordHash[21];
184 BZERO(ZPasswordHash, sizeof(ZPasswordHash));
185 BCOPY(pwHash, ZPasswordHash, 16);
188 log_packet(ZPasswordHash, sizeof(ZPasswordHash), "ChallengeResponse - ZPasswordHash", LOG_DEBUG);
191 DesEncrypt(challenge, ZPasswordHash + 0, response + 0);
192 DesEncrypt(challenge, ZPasswordHash + 7, response + 8);
193 DesEncrypt(challenge, ZPasswordHash + 14, response + 16);
196 log_packet(response, 24, "ChallengeResponse - response", LOG_DEBUG);
202 static void DesEncrypt(
203 u_char *clear, /* IN 8 octets */
204 u_char *key, /* IN 7 octets */
205 u_char *cipher /* OUT 8 octets */
209 u_char crypt_key[66];
210 u_char des_input[66];
212 MakeKey(key, des_key);
214 Expand(des_key, crypt_key);
218 CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet input : %02X%02X%02X%02X%02X%02X%02X%02X\n",
219 clear[0], clear[1], clear[2], clear[3], clear[4], clear[5], clear[6], clear[7]));
222 Expand(clear, des_input);
223 encrypt(des_input, 0);
224 Collapse(des_input, cipher);
227 CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
228 cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));
232 #else /* USE_CRYPT */
234 static void DesEncrypt(
235 u_char *clear, /* IN 8 octets */
236 u_char *key, /* IN 7 octets */
237 u_char *cipher /* OUT 8 octets */
241 des_key_schedule key_schedule;
243 MakeKey(key, des_key);
245 des_set_key(&des_key, key_schedule);
248 CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet input : %02X%02X%02X%02X%02X%02X%02X%02X\n",
249 clear[0], clear[1], clear[2], clear[3], clear[4], clear[5], clear[6], clear[7]));
252 des_ecb_encrypt((des_cblock *)clear, (des_cblock *)cipher, key_schedule, 1);
255 CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
256 cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));
260 #endif /* USE_CRYPT */
263 static u_char Get7Bits(
268 register unsigned int word;
270 word = (unsigned)input[startBit / 8] << 8;
271 word |= (unsigned)input[startBit / 8 + 1];
273 word >>= 15 - (startBit % 8 + 7);
280 /* in == 8-byte string (expanded version of the 56-bit key)
281 * out == 64-byte string where each byte is either 1 or 0
282 * Note that the low-order "bit" is always ignored by by setkey()
284 static void Expand(u_char *in, u_char *out)
289 for(i = 0; i < 64; in++){
291 for(j = 7; j >= 0; j--)
292 *out++ = (c >> j) & 01;
297 /* The inverse of Expand
299 static void Collapse(u_char *in, u_char *out)
305 for (i = 0; i < 64; i += 8, out++) {
307 for (j = 7; j >= 0; j--, in++)
315 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 */
319 des_key[0] = Get7Bits(key, 0);
320 des_key[1] = Get7Bits(key, 7);
321 des_key[2] = Get7Bits(key, 14);
322 des_key[3] = Get7Bits(key, 21);
323 des_key[4] = Get7Bits(key, 28);
324 des_key[5] = Get7Bits(key, 35);
325 des_key[6] = Get7Bits(key, 42);
326 des_key[7] = Get7Bits(key, 49);
329 des_set_odd_parity((des_cblock *)des_key);
333 CHAPDEBUG((LOG_INFO, "MakeKey: 56-bit input : %02X%02X%02X%02X%02X%02X%02X\n",
334 key[0], key[1], key[2], key[3], key[4], key[5], key[6]));
335 CHAPDEBUG((LOG_INFO, "MakeKey: 64-bit output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
336 des_key[0], des_key[1], des_key[2], des_key[3], des_key[4], des_key[5], des_key[6], des_key[7]));
340 static void ChapMS_NT(
345 MS_ChapResponse *response
350 u_char unicodePassword[MAX_NT_PASSWORD * 2];
351 static int low_byte_first = -1;
353 /* Initialize the Unicode version of the secret (== password). */
354 /* This implicitly supports 8-bit ISO8859/1 characters. */
355 BZERO(unicodePassword, sizeof(unicodePassword));
356 for (i = 0; i < secret_len; i++)
357 unicodePassword[i * 2] = (u_char)secret[i];
359 MDbegin(&md4Context);
360 MDupdate(&md4Context, unicodePassword, secret_len * 2 * 8); /* Unicode is 2 bytes/char, *8 for bit count */
362 if (low_byte_first == -1)
363 low_byte_first = (htons((unsigned short int)1) != 1);
364 if (low_byte_first == 0)
365 MDreverse((u_long *)&md4Context); /* sfb 961105 */
367 MDupdate(&md4Context, NULL, 0); /* Tell MD4 we're done */
369 ChallengeResponse(rchallenge, (char *)md4Context.buffer, response->NTResp);
373 static u_char *StdText = (u_char *)"KGS!@#$%"; /* key from rasapi32.dll */
375 static ChapMS_LANMan(
380 MS_ChapResponse *response
384 u_char UcasePassword[MAX_NT_PASSWORD]; /* max is actually 14 */
385 u_char PasswordHash[16];
387 /* LANMan password is case insensitive */
388 BZERO(UcasePassword, sizeof(UcasePassword));
389 for (i = 0; i < secret_len; i++)
390 UcasePassword[i] = (u_char)toupper(secret[i]);
391 DesEncrypt( StdText, UcasePassword + 0, PasswordHash + 0 );
392 DesEncrypt( StdText, UcasePassword + 7, PasswordHash + 8 );
393 ChallengeResponse(rchallenge, PasswordHash, response->LANManResp);
397 #endif /* MSCHAP_SUPPORT */