| /*** WARNING - THIS CODE HAS NOT BEEN FINISHED! ***/ |
| /*** The original PPPD code is written in a way to require either the UNIX DES |
| encryption functions encrypt(3) and setkey(3) or the DES library libdes. |
| Since both is not included in lwIP, MSCHAP currently does not work! */ |
| /***************************************************************************** |
| * 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 "lwip/opt.h" |
| |
| #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */ |
| |
| #if MSCHAP_SUPPORT /* don't build if not configured for use in lwipopts.h */ |
| |
| #include "ppp_impl.h" |
| #include "pppdebug.h" |
| |
| #include "md4.h" |
| #ifndef USE_CRYPT |
| #include "des.h" |
| #endif |
| #include "chap.h" |
| #include "chpms.h" |
| |
| #include <string.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 |
| ); |
| |
| static void |
| ChallengeResponse( u_char *challenge, /* IN 8 octets */ |
| u_char *pwHash, /* IN 16 octets */ |
| u_char *response /* OUT 24 octets */) |
| { |
| u_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((char*)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((char*)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; |
| |
| LWIP_UNUSED_ARG(rchallenge_len); |
| |
| /* 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 = (PP_HTONS((unsigned short int)1) != 1); |
| } |
| if (low_byte_first == 0) { |
| /* @todo: arg type - u_long* or u_int* ? */ |
| MDreverse((unsigned int*)&md4Context); /* sfb 961105 */ |
| } |
| |
| MDupdate(&md4Context, NULL, 0); /* Tell MD4 we're done */ |
| |
| ChallengeResponse((u_char*)rchallenge, (u_char*)md4Context.buffer, response->NTResp); |
| } |
| |
| #ifdef MSLANMAN |
| static u_char *StdText = (u_char *)"KGS!@#$%"; /* key from rasapi32.dll */ |
| |
| static void |
| 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 |
| |
| 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; |
| } |
| |
| #endif /* MSCHAP_SUPPORT */ |
| |
| #endif /* PPP_SUPPORT */ |