chpms.c
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- /*** WARNING - THIS CODE HAS NOT BEEN FINISHED! ***/
- /*****************************************************************************
- * chpms.c - Network MicroSoft Challenge Handshake Authentication Protocol program file.
- *
- * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
- * Copyright (c) 1997 by Global Election Systems Inc. All rights reserved.
- *
- * The authors hereby grant permission to use, copy, modify, distribute,
- * and license this software and its documentation for any purpose, provided
- * that existing copyright notices are retained in all copies and that this
- * notice and the following disclaimer are included verbatim in any
- * distributions. No written agreement, license, or royalty fee is required
- * for any of the authorized uses.
- *
- * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- ******************************************************************************
- * REVISION HISTORY
- *
- * 03-01-01 Marc Boucher <marc@mbsi.ca>
- * Ported to lwIP.
- * 97-12-08 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
- * Original based on BSD chap_ms.c.
- *****************************************************************************/
- /*
- * chap_ms.c - Microsoft MS-CHAP compatible implementation.
- *
- * Copyright (c) 1995 Eric Rosenquist, Strata Software Limited.
- * http://www.strataware.com/
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms are permitted
- * provided that the above copyright notice and this paragraph are
- * duplicated in all such forms and that any documentation,
- * advertising materials, and other materials related to such
- * distribution and use acknowledge that the software was developed
- * by Eric Rosenquist. The name of the author may not be used to
- * endorse or promote products derived from this software without
- * specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
- * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- */
- /*
- * Modifications by Lauri Pesonen / lpesonen@clinet.fi, april 1997
- *
- * Implemented LANManager type password response to MS-CHAP challenges.
- * Now pppd provides both NT style and LANMan style blocks, and the
- * prefered is set by option "ms-lanman". Default is to use NT.
- * The hash text (StdText) was taken from Win95 RASAPI32.DLL.
- *
- * You should also use DOMAIN\USERNAME as described in README.MSCHAP80
- */
- #define USE_CRYPT
- #include "ppp.h"
- #if MSCHAP_SUPPORT > 0
- #include "md4.h"
- #ifndef USE_CRYPT
- #include "des.h"
- #endif
- #include "chap.h"
- #include "chpms.h"
- #include "pppdebug.h"
- /*************************/
- /*** LOCAL DEFINITIONS ***/
- /*************************/
- /************************/
- /*** LOCAL DATA TYPES ***/
- /************************/
- typedef struct {
- u_char LANManResp[24];
- u_char NTResp[24];
- u_char UseNT; /* If 1, ignore the LANMan response field */
- } MS_ChapResponse;
- /* We use MS_CHAP_RESPONSE_LEN, rather than sizeof(MS_ChapResponse),
- in case this struct gets padded. */
- /***********************************/
- /*** LOCAL FUNCTION DECLARATIONS ***/
- /***********************************/
- /* XXX Don't know what to do with these. */
- extern void setkey(const char *);
- extern void encrypt(char *, int);
- static void DesEncrypt (u_char *, u_char *, u_char *);
- static void MakeKey (u_char *, u_char *);
- #ifdef USE_CRYPT
- static void Expand (u_char *, u_char *);
- static void Collapse (u_char *, u_char *);
- #endif
- static void ChallengeResponse(
- u_char *challenge, /* IN 8 octets */
- u_char *pwHash, /* IN 16 octets */
- u_char *response /* OUT 24 octets */
- );
- static void ChapMS_NT(
- char *rchallenge,
- int rchallenge_len,
- char *secret,
- int secret_len,
- MS_ChapResponse *response
- );
- static u_char Get7Bits(
- u_char *input,
- int startBit
- );
- /***********************************/
- /*** PUBLIC FUNCTION DEFINITIONS ***/
- /***********************************/
- void ChapMS(
- chap_state *cstate,
- char *rchallenge,
- int rchallenge_len,
- char *secret,
- int secret_len
- )
- {
- MS_ChapResponse response;
- #ifdef MSLANMAN
- extern int ms_lanman;
- #endif
-
- #if 0
- CHAPDEBUG((LOG_INFO, "ChapMS: secret is '%.*s'n", secret_len, secret));
- #endif
- BZERO(&response, sizeof(response));
-
- /* Calculate both always */
- ChapMS_NT(rchallenge, rchallenge_len, secret, secret_len, &response);
-
- #ifdef MSLANMAN
- ChapMS_LANMan(rchallenge, rchallenge_len, secret, secret_len, &response);
-
- /* prefered method is set by option */
- response.UseNT = !ms_lanman;
- #else
- response.UseNT = 1;
- #endif
-
- BCOPY(&response, cstate->response, MS_CHAP_RESPONSE_LEN);
- cstate->resp_length = MS_CHAP_RESPONSE_LEN;
- }
- /**********************************/
- /*** LOCAL FUNCTION DEFINITIONS ***/
- /**********************************/
- static void ChallengeResponse(
- u_char *challenge, /* IN 8 octets */
- u_char *pwHash, /* IN 16 octets */
- u_char *response /* OUT 24 octets */
- )
- {
- char ZPasswordHash[21];
-
- BZERO(ZPasswordHash, sizeof(ZPasswordHash));
- BCOPY(pwHash, ZPasswordHash, 16);
-
- #if 0
- log_packet(ZPasswordHash, sizeof(ZPasswordHash), "ChallengeResponse - ZPasswordHash", LOG_DEBUG);
- #endif
-
- DesEncrypt(challenge, ZPasswordHash + 0, response + 0);
- DesEncrypt(challenge, ZPasswordHash + 7, response + 8);
- DesEncrypt(challenge, ZPasswordHash + 14, response + 16);
-
- #if 0
- log_packet(response, 24, "ChallengeResponse - response", LOG_DEBUG);
- #endif
- }
- #ifdef USE_CRYPT
- static void DesEncrypt(
- u_char *clear, /* IN 8 octets */
- u_char *key, /* IN 7 octets */
- u_char *cipher /* OUT 8 octets */
- )
- {
- u_char des_key[8];
- u_char crypt_key[66];
- u_char des_input[66];
-
- MakeKey(key, des_key);
-
- Expand(des_key, crypt_key);
- setkey(crypt_key);
-
- #if 0
- CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet input : %02X%02X%02X%02X%02X%02X%02X%02Xn",
- clear[0], clear[1], clear[2], clear[3], clear[4], clear[5], clear[6], clear[7]));
- #endif
-
- Expand(clear, des_input);
- encrypt(des_input, 0);
- Collapse(des_input, cipher);
-
- #if 0
- CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet output: %02X%02X%02X%02X%02X%02X%02X%02Xn",
- cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));
- #endif
- }
- #else /* USE_CRYPT */
- static void DesEncrypt(
- u_char *clear, /* IN 8 octets */
- u_char *key, /* IN 7 octets */
- u_char *cipher /* OUT 8 octets */
- )
- {
- des_cblock des_key;
- des_key_schedule key_schedule;
-
- MakeKey(key, des_key);
-
- des_set_key(&des_key, key_schedule);
-
- #if 0
- CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet input : %02X%02X%02X%02X%02X%02X%02X%02Xn",
- clear[0], clear[1], clear[2], clear[3], clear[4], clear[5], clear[6], clear[7]));
- #endif
-
- des_ecb_encrypt((des_cblock *)clear, (des_cblock *)cipher, key_schedule, 1);
-
- #if 0
- CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet output: %02X%02X%02X%02X%02X%02X%02X%02Xn",
- cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));
- #endif
- }
- #endif /* USE_CRYPT */
- static u_char Get7Bits(
- u_char *input,
- int startBit
- )
- {
- register unsigned int word;
-
- word = (unsigned)input[startBit / 8] << 8;
- word |= (unsigned)input[startBit / 8 + 1];
-
- word >>= 15 - (startBit % 8 + 7);
-
- return word & 0xFE;
- }
- #ifdef USE_CRYPT
- /* in == 8-byte string (expanded version of the 56-bit key)
- * out == 64-byte string where each byte is either 1 or 0
- * Note that the low-order "bit" is always ignored by by setkey()
- */
- static void Expand(u_char *in, u_char *out)
- {
- int j, c;
- int i;
-
- for(i = 0; i < 64; in++){
- c = *in;
- for(j = 7; j >= 0; j--)
- *out++ = (c >> j) & 01;
- i += 8;
- }
- }
- /* The inverse of Expand
- */
- static void Collapse(u_char *in, u_char *out)
- {
- int j;
- int i;
- unsigned int c;
-
- for (i = 0; i < 64; i += 8, out++) {
- c = 0;
- for (j = 7; j >= 0; j--, in++)
- c |= *in << j;
- *out = c & 0xff;
- }
- }
- #endif
- static void MakeKey(
- u_char *key, /* IN 56 bit DES key missing parity bits */
- u_char *des_key /* OUT 64 bit DES key with parity bits added */
- )
- {
- des_key[0] = Get7Bits(key, 0);
- des_key[1] = Get7Bits(key, 7);
- des_key[2] = Get7Bits(key, 14);
- des_key[3] = Get7Bits(key, 21);
- des_key[4] = Get7Bits(key, 28);
- des_key[5] = Get7Bits(key, 35);
- des_key[6] = Get7Bits(key, 42);
- des_key[7] = Get7Bits(key, 49);
-
- #ifndef USE_CRYPT
- des_set_odd_parity((des_cblock *)des_key);
- #endif
-
- #if 0
- CHAPDEBUG((LOG_INFO, "MakeKey: 56-bit input : %02X%02X%02X%02X%02X%02X%02Xn",
- key[0], key[1], key[2], key[3], key[4], key[5], key[6]));
- CHAPDEBUG((LOG_INFO, "MakeKey: 64-bit output: %02X%02X%02X%02X%02X%02X%02X%02Xn",
- des_key[0], des_key[1], des_key[2], des_key[3], des_key[4], des_key[5], des_key[6], des_key[7]));
- #endif
- }
- static void ChapMS_NT(
- char *rchallenge,
- int rchallenge_len,
- char *secret,
- int secret_len,
- MS_ChapResponse *response
- )
- {
- int i;
- MDstruct md4Context;
- u_char unicodePassword[MAX_NT_PASSWORD * 2];
- static int low_byte_first = -1;
-
- /* Initialize the Unicode version of the secret (== password). */
- /* This implicitly supports 8-bit ISO8859/1 characters. */
- BZERO(unicodePassword, sizeof(unicodePassword));
- for (i = 0; i < secret_len; i++)
- unicodePassword[i * 2] = (u_char)secret[i];
-
- MDbegin(&md4Context);
- MDupdate(&md4Context, unicodePassword, secret_len * 2 * 8); /* Unicode is 2 bytes/char, *8 for bit count */
-
- if (low_byte_first == -1)
- low_byte_first = (htons((unsigned short int)1) != 1);
- if (low_byte_first == 0)
- MDreverse((u_long *)&md4Context); /* sfb 961105 */
-
- MDupdate(&md4Context, NULL, 0); /* Tell MD4 we're done */
-
- ChallengeResponse(rchallenge, (char *)md4Context.buffer, response->NTResp);
- }
- #ifdef MSLANMAN
- static u_char *StdText = (u_char *)"KGS!@#$%"; /* key from rasapi32.dll */
- static ChapMS_LANMan(
- char *rchallenge,
- int rchallenge_len,
- char *secret,
- int secret_len,
- MS_ChapResponse *response
- )
- {
- int i;
- u_char UcasePassword[MAX_NT_PASSWORD]; /* max is actually 14 */
- u_char PasswordHash[16];
-
- /* LANMan password is case insensitive */
- BZERO(UcasePassword, sizeof(UcasePassword));
- for (i = 0; i < secret_len; i++)
- UcasePassword[i] = (u_char)toupper(secret[i]);
- DesEncrypt( StdText, UcasePassword + 0, PasswordHash + 0 );
- DesEncrypt( StdText, UcasePassword + 7, PasswordHash + 8 );
- ChallengeResponse(rchallenge, PasswordHash, response->LANManResp);
- }
- #endif
- #endif /* MSCHAP_SUPPORT */