/*** 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 * Ported to lwIP. * 97-12-08 Guy Lancaster , 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%02X\n", 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%02X\n", 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%02X\n", 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%02X\n", 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%02X\n", 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%02X\n", 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 */