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| mbed714 |
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/*** WARNING - THIS CODE HAS NOT BEEN FINISHED! ***/
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/*** The original PPPD code is written in a way to require either the UNIX DES
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encryption functions encrypt(3) and setkey(3) or the DES library libdes.
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Since both is not included in lwIP, MSCHAP currently does not work! */
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/*****************************************************************************
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* chpms.c - Network MicroSoft Challenge Handshake Authentication Protocol program file.
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*
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* Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
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* Copyright (c) 1997 by Global Election Systems Inc. All rights reserved.
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice and the following disclaimer are included verbatim in any
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* distributions. No written agreement, license, or royalty fee is required
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* for any of the authorized uses.
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*
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* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************
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* REVISION HISTORY
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*
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* 03-01-01 Marc Boucher <marc@mbsi.ca>
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* Ported to lwIP.
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* 97-12-08 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
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* Original based on BSD chap_ms.c.
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*****************************************************************************/
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/*
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* chap_ms.c - Microsoft MS-CHAP compatible implementation.
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*
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* Copyright (c) 1995 Eric Rosenquist, Strata Software Limited.
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* http://www.strataware.com/
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by Eric Rosenquist. The name of the author may not be used to
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| mbed714 |
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* endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/*
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* Modifications by Lauri Pesonen / lpesonen@clinet.fi, april 1997
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*
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* Implemented LANManager type password response to MS-CHAP challenges.
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63
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* Now pppd provides both NT style and LANMan style blocks, and the
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* prefered is set by option "ms-lanman". Default is to use NT.
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* The hash text (StdText) was taken from Win95 RASAPI32.DLL.
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*
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* You should also use DOMAIN\\USERNAME as described in README.MSCHAP80
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*/
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#define USE_CRYPT
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#include "lwip/opt.h"
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|
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74
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#if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
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75
|
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#if MSCHAP_SUPPORT /* don't build if not configured for use in lwipopts.h */
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77
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#include "ppp.h"
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79
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#include "pppdebug.h"
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80
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81
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#include "md4.h"
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#ifndef USE_CRYPT
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83
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#include "des.h"
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84
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#endif
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85
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#include "chap.h"
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86
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#include "chpms.h"
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87
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88
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#include <string.h>
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89
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90
|
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/*************************/
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/*** LOCAL DEFINITIONS ***/
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/*************************/
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|
94
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95
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/************************/
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/*** LOCAL DATA TYPES ***/
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98
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/************************/
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typedef struct {
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100
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u_char LANManResp[24];
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u_char NTResp[24];
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u_char UseNT; /* If 1, ignore the LANMan response field */
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} MS_ChapResponse;
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/* We use MS_CHAP_RESPONSE_LEN, rather than sizeof(MS_ChapResponse),
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in case this struct gets padded. */
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/***********************************/
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/*** LOCAL FUNCTION DECLARATIONS ***/
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/***********************************/
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/* XXX Don't know what to do with these. */
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extern void setkey(const char *);
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extern void encrypt(char *, int);
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static void DesEncrypt (u_char *, u_char *, u_char *);
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static void MakeKey (u_char *, u_char *);
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#ifdef USE_CRYPT
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static void Expand (u_char *, u_char *);
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static void Collapse (u_char *, u_char *);
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#endif
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125
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static void ChallengeResponse(
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126
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u_char *challenge, /* IN 8 octets */
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127
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u_char *pwHash, /* IN 16 octets */
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128
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u_char *response /* OUT 24 octets */
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129
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);
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130
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static void ChapMS_NT(
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131
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char *rchallenge,
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int rchallenge_len,
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char *secret,
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int secret_len,
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MS_ChapResponse *response
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136
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);
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137
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static u_char Get7Bits(
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138
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u_char *input,
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139
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int startBit
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140
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);
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141
|
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142
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static void
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143
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ChallengeResponse( u_char *challenge, /* IN 8 octets */
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144
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u_char *pwHash, /* IN 16 octets */
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145
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u_char *response /* OUT 24 octets */)
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146
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{
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147
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u_char ZPasswordHash[21];
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148
|
|
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149
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BZERO(ZPasswordHash, sizeof(ZPasswordHash));
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150
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BCOPY(pwHash, ZPasswordHash, 16);
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151
|
|
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152
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#if 0
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153
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log_packet(ZPasswordHash, sizeof(ZPasswordHash), "ChallengeResponse - ZPasswordHash", LOG_DEBUG);
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154
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#endif
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155
|
|
| mbed714 |
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156
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DesEncrypt(challenge, ZPasswordHash + 0, response + 0);
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157
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DesEncrypt(challenge, ZPasswordHash + 7, response + 8);
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| mbed714 |
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158
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DesEncrypt(challenge, ZPasswordHash + 14, response + 16);
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|
159
|
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| mbed714 |
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160
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#if 0
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| mbed714 |
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161
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log_packet(response, 24, "ChallengeResponse - response", LOG_DEBUG);
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162
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#endif
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163
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}
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|
164
|
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| mbed714 |
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165
|
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| mbed714 |
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166
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#ifdef USE_CRYPT
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| mbed714 |
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167
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static void
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| mbed714 |
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168
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DesEncrypt( u_char *clear, /* IN 8 octets */
|
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169
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u_char *key, /* IN 7 octets */
|
| mbed714 |
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170
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u_char *cipher /* OUT 8 octets */)
|
| mbed714 |
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|
171
|
{
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| mbed714 |
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172
|
u_char des_key[8];
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173
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u_char crypt_key[66];
|
| mbed714 |
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174
|
u_char des_input[66];
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175
|
|
| mbed714 |
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176
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MakeKey(key, des_key);
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177
|
|
| mbed714 |
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178
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Expand(des_key, crypt_key);
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179
|
setkey((char*)crypt_key);
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|
180
|
|
| mbed714 |
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|
181
|
#if 0
|
| mbed714 |
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182
|
CHAPDEBUG(LOG_INFO, ("DesEncrypt: 8 octet input : %02X%02X%02X%02X%02X%02X%02X%02X\n",
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183
|
clear[0], clear[1], clear[2], clear[3], clear[4], clear[5], clear[6], clear[7]));
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184
|
#endif
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185
|
|
| mbed714 |
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186
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Expand(clear, des_input);
|
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187
|
encrypt((char*)des_input, 0);
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188
|
Collapse(des_input, cipher);
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|
189
|
|
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|
190
|
#if 0
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| mbed714 |
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191
|
CHAPDEBUG(LOG_INFO, ("DesEncrypt: 8 octet output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
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| mbed714 |
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192
|
cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));
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193
|
#endif
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194
|
}
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195
|
|
| mbed714 |
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196
|
#else /* USE_CRYPT */
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197
|
|
| mbed714 |
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|
198
|
static void
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| mbed714 |
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199
|
DesEncrypt( u_char *clear, /* IN 8 octets */
|
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200
|
u_char *key, /* IN 7 octets */
|
| mbed714 |
0:d616ece2d859
|
201
|
u_char *cipher /* OUT 8 octets */)
|
| mbed714 |
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|
202
|
{
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| mbed714 |
0:d616ece2d859
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203
|
des_cblock des_key;
|
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204
|
des_key_schedule key_schedule;
|
| mbed714 |
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|
205
|
|
| mbed714 |
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206
|
MakeKey(key, des_key);
|
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|
207
|
|
| mbed714 |
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208
|
des_set_key(&des_key, key_schedule);
|
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|
209
|
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| mbed714 |
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210
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#if 0
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211
|
CHAPDEBUG(LOG_INFO, ("DesEncrypt: 8 octet input : %02X%02X%02X%02X%02X%02X%02X%02X\n",
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212
|
clear[0], clear[1], clear[2], clear[3], clear[4], clear[5], clear[6], clear[7]));
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213
|
#endif
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|
214
|
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215
|
des_ecb_encrypt((des_cblock *)clear, (des_cblock *)cipher, key_schedule, 1);
|
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216
|
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217
|
#if 0
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218
|
CHAPDEBUG(LOG_INFO, ("DesEncrypt: 8 octet output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
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219
|
cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));
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220
|
#endif
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221
|
}
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|
222
|
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223
|
#endif /* USE_CRYPT */
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|
224
|
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225
|
|
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226
|
static u_char
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227
|
Get7Bits( u_char *input, int startBit)
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228
|
{
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229
|
register unsigned int word;
|
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230
|
|
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231
|
word = (unsigned)input[startBit / 8] << 8;
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232
|
word |= (unsigned)input[startBit / 8 + 1];
|
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|
233
|
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234
|
word >>= 15 - (startBit % 8 + 7);
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235
|
|
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236
|
return word & 0xFE;
|
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237
|
}
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|
238
|
|
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239
|
#ifdef USE_CRYPT
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240
|
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241
|
/* in == 8-byte string (expanded version of the 56-bit key)
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242
|
* out == 64-byte string where each byte is either 1 or 0
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243
|
* Note that the low-order "bit" is always ignored by by setkey()
|
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244
|
*/
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|
245
|
static void
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|
246
|
Expand(u_char *in, u_char *out)
|
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|
247
|
{
|
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|
248
|
int j, c;
|
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|
249
|
int i;
|
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|
250
|
|
| mbed714 |
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|
251
|
for(i = 0; i < 64; in++){
|
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|
252
|
c = *in;
|
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|
253
|
for(j = 7; j >= 0; j--) {
|
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0:d616ece2d859
|
254
|
*out++ = (c >> j) & 01;
|
| mbed714 |
0:d616ece2d859
|
255
|
}
|
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|
256
|
i += 8;
|
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|
257
|
}
|
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|
258
|
}
|
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|
259
|
|
| mbed714 |
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|
260
|
/* The inverse of Expand
|
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|
261
|
*/
|
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|
262
|
static void
|
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|
263
|
Collapse(u_char *in, u_char *out)
|
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0:d616ece2d859
|
264
|
{
|
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0:d616ece2d859
|
265
|
int j;
|
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|
266
|
int i;
|
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0:d616ece2d859
|
267
|
unsigned int c;
|
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|
268
|
|
| mbed714 |
0:d616ece2d859
|
269
|
for (i = 0; i < 64; i += 8, out++) {
|
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|
270
|
c = 0;
|
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0:d616ece2d859
|
271
|
for (j = 7; j >= 0; j--, in++) {
|
| mbed714 |
0:d616ece2d859
|
272
|
c |= *in << j;
|
| mbed714 |
0:d616ece2d859
|
273
|
}
|
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0:d616ece2d859
|
274
|
*out = c & 0xff;
|
| mbed714 |
0:d616ece2d859
|
275
|
}
|
| mbed714 |
0:d616ece2d859
|
276
|
}
|
| mbed714 |
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|
277
|
#endif
|
| mbed714 |
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|
278
|
|
| mbed714 |
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|
279
|
static void
|
| mbed714 |
0:d616ece2d859
|
280
|
MakeKey( u_char *key, /* IN 56 bit DES key missing parity bits */
|
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0:d616ece2d859
|
281
|
u_char *des_key /* OUT 64 bit DES key with parity bits added */)
|
| mbed714 |
0:d616ece2d859
|
282
|
{
|
| mbed714 |
0:d616ece2d859
|
283
|
des_key[0] = Get7Bits(key, 0);
|
| mbed714 |
0:d616ece2d859
|
284
|
des_key[1] = Get7Bits(key, 7);
|
| mbed714 |
0:d616ece2d859
|
285
|
des_key[2] = Get7Bits(key, 14);
|
| mbed714 |
0:d616ece2d859
|
286
|
des_key[3] = Get7Bits(key, 21);
|
| mbed714 |
0:d616ece2d859
|
287
|
des_key[4] = Get7Bits(key, 28);
|
| mbed714 |
0:d616ece2d859
|
288
|
des_key[5] = Get7Bits(key, 35);
|
| mbed714 |
0:d616ece2d859
|
289
|
des_key[6] = Get7Bits(key, 42);
|
| mbed714 |
0:d616ece2d859
|
290
|
des_key[7] = Get7Bits(key, 49);
|
| mbed714 |
0:d616ece2d859
|
291
|
|
| mbed714 |
0:d616ece2d859
|
292
|
#ifndef USE_CRYPT
|
| mbed714 |
0:d616ece2d859
|
293
|
des_set_odd_parity((des_cblock *)des_key);
|
| mbed714 |
0:d616ece2d859
|
294
|
#endif
|
| mbed714 |
0:d616ece2d859
|
295
|
|
| mbed714 |
0:d616ece2d859
|
296
|
#if 0
|
| mbed714 |
0:d616ece2d859
|
297
|
CHAPDEBUG(LOG_INFO, ("MakeKey: 56-bit input : %02X%02X%02X%02X%02X%02X%02X\n",
|
| mbed714 |
0:d616ece2d859
|
298
|
key[0], key[1], key[2], key[3], key[4], key[5], key[6]));
|
| mbed714 |
0:d616ece2d859
|
299
|
CHAPDEBUG(LOG_INFO, ("MakeKey: 64-bit output: %02X%02X%02X%02X%02X%02X%02X%02X\n",
|
| mbed714 |
0:d616ece2d859
|
300
|
des_key[0], des_key[1], des_key[2], des_key[3], des_key[4], des_key[5], des_key[6], des_key[7]));
|
| mbed714 |
0:d616ece2d859
|
301
|
#endif
|
| mbed714 |
0:d616ece2d859
|
302
|
}
|
| mbed714 |
0:d616ece2d859
|
303
|
|
| mbed714 |
0:d616ece2d859
|
304
|
static void
|
| mbed714 |
0:d616ece2d859
|
305
|
ChapMS_NT( char *rchallenge,
|
| mbed714 |
0:d616ece2d859
|
306
|
int rchallenge_len,
|
| mbed714 |
0:d616ece2d859
|
307
|
char *secret,
|
| mbed714 |
0:d616ece2d859
|
308
|
int secret_len,
|
| mbed714 |
0:d616ece2d859
|
309
|
MS_ChapResponse *response)
|
| mbed714 |
0:d616ece2d859
|
310
|
{
|
| mbed714 |
0:d616ece2d859
|
311
|
int i;
|
| mbed714 |
0:d616ece2d859
|
312
|
MDstruct md4Context;
|
| mbed714 |
0:d616ece2d859
|
313
|
u_char unicodePassword[MAX_NT_PASSWORD * 2];
|
| mbed714 |
0:d616ece2d859
|
314
|
static int low_byte_first = -1;
|
| mbed714 |
0:d616ece2d859
|
315
|
|
| mbed714 |
0:d616ece2d859
|
316
|
LWIP_UNUSED_ARG(rchallenge_len);
|
| mbed714 |
0:d616ece2d859
|
317
|
|
| mbed714 |
0:d616ece2d859
|
318
|
/* Initialize the Unicode version of the secret (== password). */
|
| mbed714 |
0:d616ece2d859
|
319
|
/* This implicitly supports 8-bit ISO8859/1 characters. */
|
| mbed714 |
0:d616ece2d859
|
320
|
BZERO(unicodePassword, sizeof(unicodePassword));
|
| mbed714 |
0:d616ece2d859
|
321
|
for (i = 0; i < secret_len; i++) {
|
| mbed714 |
0:d616ece2d859
|
322
|
unicodePassword[i * 2] = (u_char)secret[i];
|
| mbed714 |
0:d616ece2d859
|
323
|
}
|
| mbed714 |
0:d616ece2d859
|
324
|
MDbegin(&md4Context);
|
| mbed714 |
0:d616ece2d859
|
325
|
MDupdate(&md4Context, unicodePassword, secret_len * 2 * 8); /* Unicode is 2 bytes/char, *8 for bit count */
|
| mbed714 |
0:d616ece2d859
|
326
|
|
| mbed714 |
0:d616ece2d859
|
327
|
if (low_byte_first == -1) {
|
| mbed714 |
0:d616ece2d859
|
328
|
low_byte_first = (PP_HTONS((unsigned short int)1) != 1);
|
| mbed714 |
0:d616ece2d859
|
329
|
}
|
| mbed714 |
0:d616ece2d859
|
330
|
if (low_byte_first == 0) {
|
| mbed714 |
0:d616ece2d859
|
331
|
/* @todo: arg type - u_long* or u_int* ? */
|
| mbed714 |
0:d616ece2d859
|
332
|
MDreverse((unsigned int*)&md4Context); /* sfb 961105 */
|
| mbed714 |
0:d616ece2d859
|
333
|
}
|
| mbed714 |
0:d616ece2d859
|
334
|
|
| mbed714 |
0:d616ece2d859
|
335
|
MDupdate(&md4Context, NULL, 0); /* Tell MD4 we're done */
|
| mbed714 |
0:d616ece2d859
|
336
|
|
| mbed714 |
0:d616ece2d859
|
337
|
ChallengeResponse((u_char*)rchallenge, (u_char*)md4Context.buffer, response->NTResp);
|
| mbed714 |
0:d616ece2d859
|
338
|
}
|
| mbed714 |
0:d616ece2d859
|
339
|
|
| mbed714 |
0:d616ece2d859
|
340
|
#ifdef MSLANMAN
|
| mbed714 |
0:d616ece2d859
|
341
|
static u_char *StdText = (u_char *)"KGS!@#$%"; /* key from rasapi32.dll */
|
| mbed714 |
0:d616ece2d859
|
342
|
|
| mbed714 |
0:d616ece2d859
|
343
|
static void
|
| mbed714 |
0:d616ece2d859
|
344
|
ChapMS_LANMan( char *rchallenge,
|
| mbed714 |
0:d616ece2d859
|
345
|
int rchallenge_len,
|
| mbed714 |
0:d616ece2d859
|
346
|
char *secret,
|
| mbed714 |
0:d616ece2d859
|
347
|
int secret_len,
|
| mbed714 |
0:d616ece2d859
|
348
|
MS_ChapResponse *response)
|
| mbed714 |
0:d616ece2d859
|
349
|
{
|
| mbed714 |
0:d616ece2d859
|
350
|
int i;
|
| mbed714 |
0:d616ece2d859
|
351
|
u_char UcasePassword[MAX_NT_PASSWORD]; /* max is actually 14 */
|
| mbed714 |
0:d616ece2d859
|
352
|
u_char PasswordHash[16];
|
| mbed714 |
0:d616ece2d859
|
353
|
|
| mbed714 |
0:d616ece2d859
|
354
|
/* LANMan password is case insensitive */
|
| mbed714 |
0:d616ece2d859
|
355
|
BZERO(UcasePassword, sizeof(UcasePassword));
|
| mbed714 |
0:d616ece2d859
|
356
|
for (i = 0; i < secret_len; i++) {
|
| mbed714 |
0:d616ece2d859
|
357
|
UcasePassword[i] = (u_char)toupper(secret[i]);
|
| mbed714 |
0:d616ece2d859
|
358
|
}
|
| mbed714 |
0:d616ece2d859
|
359
|
DesEncrypt( StdText, UcasePassword + 0, PasswordHash + 0 );
|
| mbed714 |
0:d616ece2d859
|
360
|
DesEncrypt( StdText, UcasePassword + 7, PasswordHash + 8 );
|
| mbed714 |
0:d616ece2d859
|
361
|
ChallengeResponse(rchallenge, PasswordHash, response->LANManResp);
|
| mbed714 |
0:d616ece2d859
|
362
|
}
|
| mbed714 |
0:d616ece2d859
|
363
|
#endif
|
| mbed714 |
0:d616ece2d859
|
364
|
|
| mbed714 |
0:d616ece2d859
|
365
|
void
|
| mbed714 |
0:d616ece2d859
|
366
|
ChapMS( chap_state *cstate, char *rchallenge, int rchallenge_len, char *secret, int secret_len)
|
| mbed714 |
0:d616ece2d859
|
367
|
{
|
| mbed714 |
0:d616ece2d859
|
368
|
MS_ChapResponse response;
|
| mbed714 |
0:d616ece2d859
|
369
|
#ifdef MSLANMAN
|
| mbed714 |
0:d616ece2d859
|
370
|
extern int ms_lanman;
|
| mbed714 |
0:d616ece2d859
|
371
|
#endif
|
| mbed714 |
0:d616ece2d859
|
372
|
|
| mbed714 |
0:d616ece2d859
|
373
|
#if 0
|
| mbed714 |
0:d616ece2d859
|
374
|
CHAPDEBUG(LOG_INFO, ("ChapMS: secret is '%.*s'\n", secret_len, secret));
|
| mbed714 |
0:d616ece2d859
|
375
|
#endif
|
| mbed714 |
0:d616ece2d859
|
376
|
BZERO(&response, sizeof(response));
|
| mbed714 |
0:d616ece2d859
|
377
|
|
| mbed714 |
0:d616ece2d859
|
378
|
/* Calculate both always */
|
| mbed714 |
0:d616ece2d859
|
379
|
ChapMS_NT(rchallenge, rchallenge_len, secret, secret_len, &response);
|
| mbed714 |
0:d616ece2d859
|
380
|
|
| mbed714 |
0:d616ece2d859
|
381
|
#ifdef MSLANMAN
|
| mbed714 |
0:d616ece2d859
|
382
|
ChapMS_LANMan(rchallenge, rchallenge_len, secret, secret_len, &response);
|
| mbed714 |
0:d616ece2d859
|
383
|
|
| mbed714 |
0:d616ece2d859
|
384
|
/* prefered method is set by option */
|
| mbed714 |
0:d616ece2d859
|
385
|
response.UseNT = !ms_lanman;
|
| mbed714 |
0:d616ece2d859
|
386
|
#else
|
| mbed714 |
0:d616ece2d859
|
387
|
response.UseNT = 1;
|
| mbed714 |
0:d616ece2d859
|
388
|
#endif
|
| mbed714 |
0:d616ece2d859
|
389
|
|
| mbed714 |
0:d616ece2d859
|
390
|
BCOPY(&response, cstate->response, MS_CHAP_RESPONSE_LEN);
|
| mbed714 |
0:d616ece2d859
|
391
|
cstate->resp_length = MS_CHAP_RESPONSE_LEN;
|
| mbed714 |
0:d616ece2d859
|
392
|
}
|
| mbed714 |
0:d616ece2d859
|
393
|
|
| mbed714 |
0:d616ece2d859
|
394
|
#endif /* MSCHAP_SUPPORT */
|
| mbed714 |
0:d616ece2d859
|
395
|
|
| mbed714 |
0:d616ece2d859
|
396
|
#endif /* PPP_SUPPORT */
|
Daniel Peter