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1 // Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // Extensions (MS-CHAP) - RFC 2433, except the authenticator-controlled |
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15 // authentication retry mechanisms and the password changing mechanisms - |
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16 // this is in accordance with the requirements. |
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17 // |
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18 // |
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19 |
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20 /** |
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21 @file |
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22 @brief Source file for the implementation of Microsoft PPP CHAP |
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23 @internalComponent |
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24 */ |
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25 |
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26 #include "MSCHAP.H" |
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27 #include "PPPConfig.h" |
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28 |
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29 // using DES |
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30 #include <symmetric.h> |
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31 |
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32 //using MD4 |
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33 #include "MD4.H" |
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34 |
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35 |
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36 CPppMsChap::CPppMsChap() |
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37 /** |
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38 Constructor. |
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39 @internalComponent |
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40 */ |
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41 : iResponseValue(KPppMsChapResponseValueSize) |
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42 { |
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43 } |
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44 |
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45 void CPppMsChap::InitL(CPppLcp* aLcp) |
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46 /** |
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47 @copydoc CPppChap::InitL(CPppLcp*) |
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48 @see CPppChap::InitL(CPppLcp*) |
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49 @internalComponent |
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50 */ |
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51 { |
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52 CPppChap::InitL(aLcp); |
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53 |
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54 #ifdef __MS_CHAP_WITH_LAN_MANAGER__ |
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55 iUseNTResponse = ETrue; |
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56 #endif // __MS_CHAP_WITH_LAN_MANAGER__ |
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57 } |
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58 |
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59 CPppMsChap::~CPppMsChap() |
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60 /** |
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61 Destructor. |
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62 @internalComponent |
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63 */ |
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64 { |
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65 #ifdef _UNICODE |
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66 delete iUserName; |
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67 #endif |
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68 } |
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69 |
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70 |
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71 void CPppMsChap::CheckChallengePacketL(RMBufPacket& aPacket) |
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72 /** |
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73 @copydoc CPppChap::CheckChallengePacketL(RMBufPacket&) |
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74 @copydoc CPppChap::CheckChallengePacketL(RMBufPacket&) |
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75 @internalComponent |
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76 */ |
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77 { |
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78 __ASSERT_ALWAYS(aPacket.Length() >= KPppChapCodeFieldSize + |
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79 KPppChapIdFieldSize + |
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80 KPppChapLengthFieldSize + |
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81 KPppChapValueSizeFieldSize + |
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82 KPppMsChapChallengeSize, |
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83 User::Leave(KErrUnderflow)); |
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84 |
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85 __ASSERT_ALWAYS(*(aPacket.First()->Ptr() + |
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86 KPppChapCodeFieldSize + |
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87 KPppChapIdFieldSize + |
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88 KPppChapLengthFieldSize) == |
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89 KPppMsChapChallengeSize, |
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90 User::Leave(KErrOverflow)); |
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91 } |
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92 |
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93 |
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94 void CPppMsChap::MakeResponseL(TUint8 /*aChallengeId*/, |
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95 const TDesC8& aChallengeValue, |
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96 TPtrC8& aResponseValue, |
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97 TPtrC8& aResponseName) |
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98 /** |
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99 @copydoc CPppChap::MakeResponseL(TUint8, const TDesC8&, TPtrC8&, TPtrC8&) |
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100 @see CPppChap::MakeResponseL(TUint8, const TDesC8&, TPtrC8&, TPtrC8&) |
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101 @internalComponent |
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102 */ |
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103 { |
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104 ASSERT(aChallengeValue.Length() == KPppMsChapChallengeSize); |
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105 |
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106 const CCredentialsConfig* credentials = iPppLcp->GetCredentials(); |
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107 const TDesC& password = credentials->GetPassword(); |
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108 |
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109 #ifndef __MS_CHAP_WITH_LAN_MANAGER__ |
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110 |
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111 // The NT password shall not be longer than |
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112 // KPppMsChapMaxNTPasswordLength |
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113 __ASSERT_ALWAYS(password.Length() <= |
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114 KPppMsChapMaxNTPasswordLength, |
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115 User::Leave(KErrTooBig)); |
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116 |
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117 #else // __MS_CHAP_WITH_LAN_MANAGER__ |
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118 |
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119 if (iUseNTResponse) |
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120 // The NT password shall not be longer than |
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121 // KPppMsChapMaxNTPasswordLength |
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122 __ASSERT_ALWAYS(password.Length() <= |
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123 KPppMsChapMaxNTPasswordLength, |
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124 User::Leave(KErrTooBig)); |
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125 else |
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126 // The LAN Manager password shall not be longer than |
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127 // KPppMsChapMaxNTPasswordLength OEM characters |
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128 __ASSERT_ALWAYS(password.Length() <= |
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129 KPppMsChapMaxLANManagerPasswordLength, |
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130 User::Leave(KErrTooBig)); |
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131 |
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132 #endif // __MS_CHAP_WITH_LAN_MANAGER__ |
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133 |
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134 #ifdef _UNICODE |
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135 TPtrC16 uniPassword(password); |
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136 #else // ! _UNICODE |
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137 // The following MS-CHAP routines require the password to be |
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138 // represented as 0-to-256-unicode-char (RFC 2433), so convert the |
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139 // password to Unicode. |
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140 HBufC16& uniPassword = *HBufC16::NewLC(password.Length()); |
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141 uniPassword.Des().Copy(password); |
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142 #endif // ! _UNICODE |
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143 |
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144 TPtr8 ntResponse(const_cast<TUint8*>(iResponseValue.Ptr()) + |
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145 KPppMsChapLanManResponseSize, |
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146 KPppMsChapNTResponseSize, |
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147 KPppMsChapNTResponseSize); |
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148 NTChallengeResponseL(aChallengeValue, |
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149 uniPassword, |
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150 ntResponse); |
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151 |
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152 TPtr8 lmResponse(const_cast<TUint8*>(iResponseValue.Ptr()), |
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153 KPppMsChapLanManResponseSize, |
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154 KPppMsChapLanManResponseSize); |
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155 |
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156 #ifdef __MS_CHAP_WITH_LAN_MANAGER__ |
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157 |
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158 #ifdef _UNICODE |
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159 // The following MS-CHAP routines require the password to be |
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160 // represented as 0-to-14-oem-char (RFC 2433), so convert the |
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161 // password. |
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162 HBufC8& oemPassword = *HBufC8::NewLC(password.Length()); |
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163 oemPassword.Des().Copy(password); |
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164 #else // ! _UNICODE |
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165 TPtrC8 oemPassword(password); |
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166 #endif // ! _UNICODE |
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167 |
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168 LmChallengeResponseL(aChallengeValue, |
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169 oemPassword, |
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170 lmResponse); |
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171 *(const_cast<TUint8*>(iResponseValue.Ptr()) + |
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172 KPppMsChapLanManResponseSize + |
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173 KPppMsChapNTResponseSize) |
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174 = static_cast<TUint8>(iUseNTResponse); |
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175 |
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176 #else //! __MS_CHAP_WITH_LAN_MANAGER__ |
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177 |
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178 lmResponse.FillZ(); |
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179 *(const_cast<TUint8*>(iResponseValue.Ptr()) + |
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180 KPppMsChapLanManResponseSize + |
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181 KPppMsChapNTResponseSize) = 1; |
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182 #endif //! __MS_CHAP_WITH_LAN_MANAGER__ |
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183 |
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184 aResponseValue.Set(iResponseValue); |
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185 |
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186 // The NT username shall not be longer than |
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187 // KPppMsChapMaxNTUserNameLength |
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188 const TDesC& username = credentials->GetUserName(); |
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189 __ASSERT_ALWAYS(username.Length() <= |
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190 KPppMsChapMaxNTUserNameLength, |
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191 User::Leave(KErrTooBig)); |
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192 |
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193 #ifdef _UNICODE |
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194 // The MS-CHAP routines require the username to be represented as |
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195 // 0-to-256-char (RFC 2433), so convert the username. |
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196 delete iUserName; |
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197 iUserName = 0; |
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198 iUserName = HBufC8::NewL(username.Length()); |
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199 iUserName->Des().Copy(username); |
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200 aResponseName.Set(*iUserName); |
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201 #else //! _UNICODE |
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202 aResponseName.Set(username); |
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203 #endif //! _UNICODE |
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204 |
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205 #ifdef _UNICODE |
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206 |
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207 #ifdef __MS_CHAP_WITH_LAN_MANAGER__ |
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208 CleanupStack::PopAndDestroy(&oemPassword); |
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209 #endif // __MS_CHAP_WITH_LAN_MANAGER__ |
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210 |
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211 #else //! _UNICODE |
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212 CleanupStack::PopAndDestroy(&uniPassword); |
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213 #endif //! _UNICODE |
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214 |
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215 ASSERT(aResponseValue.Length() == KPppMsChapResponseValueSize); |
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216 ASSERT(aResponseName.Length() >= KPppChapMinNameSize && |
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217 aResponseName.Length() <= KPppMsChapMaxNTUserNameLength); |
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218 } |
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219 |
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220 |
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221 void CPppMsChap::FailureL(RMBufPacket& aPacket) |
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222 /** |
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223 @copydoc CPppChap::FailureL(RMBufPacket&) |
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224 @see CPppChap::FailureL(RMBufPacket&) |
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225 @internalComponent |
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226 */ |
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227 { |
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228 __ASSERT_ALWAYS(aPacket.Length() >= KPppChapCodeFieldSize + |
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229 KPppChapIdFieldSize + |
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230 KPppChapLengthFieldSize , |
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231 User::Leave(KErrUnderflow)); |
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232 if (!CheckIdentifier(aPacket)) |
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233 User::Leave(KErrGeneral); |
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234 |
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235 TimerCancel(); |
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236 |
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237 TPtrC8 failureMessage(aPacket.First()->Ptr() + |
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238 KPppChapCodeFieldSize + |
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239 KPppChapIdFieldSize + |
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240 KPppChapLengthFieldSize, |
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241 aPacket.Length() - |
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242 KPppChapCodeFieldSize - |
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243 KPppChapIdFieldSize - |
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244 KPppChapLengthFieldSize); |
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245 |
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246 if (failureMessage.Length()==0) |
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247 { |
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248 DoFail(KErrIfAuthenticationFailure); |
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249 return; |
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250 } |
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251 |
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252 TUint msChapError; |
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253 TUint8 isRetryAllowed; |
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254 TUint8 passwordProtoVersion; |
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255 TBool hasNewChallenge; |
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256 TInt sysError = KErrIfAuthenticationFailure; |
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257 |
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258 ProcessFailureMessageL(failureMessage, |
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259 msChapError, |
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260 isRetryAllowed, |
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261 hasNewChallenge, |
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262 iChallengeRef, |
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263 passwordProtoVersion); |
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264 |
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265 sysError = TranslateMsChapError(msChapError); |
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266 |
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267 #ifndef __MS_CHAP_WITH_LAN_MANAGER__ |
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268 |
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269 // The authenticator-controlled authentication retry mechanisms and |
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270 // the password changing mechanisms have not been implemented in this |
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271 // release - this is in accordance with the project requirements. |
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272 // Consequently simply fail. |
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273 |
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274 DoFail(sysError); |
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275 |
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276 #else // __MS_CHAP_WITH_LAN_MANAGER__ |
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277 |
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278 // The code only handles KPppMsChapAuthenticationFailure, and no other |
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279 // MS-CHAP specific errors. In particular, this code does not handle |
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280 // KPppMsChapErrorPasswordExpired, since the password changing |
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281 // mechanisms have not been implemented in this release - this is in |
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282 // accordance with the project requirements. |
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283 if (msChapError != KPppMsChapAuthenticationFailure) |
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284 { |
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285 DoFail(sysError); |
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286 return; |
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287 } |
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288 |
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289 if (!isRetryAllowed) |
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290 { |
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291 DoFail(sysError); |
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292 return; |
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293 } |
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294 |
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295 if (!hasNewChallenge) |
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296 iChallengeRef[0] += 23; // magic constant from RFC 2433 |
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297 |
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298 |
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299 if(!iUseNTResponse) |
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300 { |
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301 // Has already retried authentication using a LAN Manager compatible |
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302 // Challenge Response. Have tried Microsoft Windows NT compatible |
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303 // Challenge Response and LAN Manager compatible Challenge Response, |
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304 // so fail now |
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305 iUseNTResponse = ETrue; |
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306 DoFail(sysError); |
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307 return; |
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308 } |
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309 |
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310 // Retry authentication using a LAN Manager compatible Challenge |
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311 // Response. |
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312 iUseNTResponse = EFalse; |
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313 |
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314 RetryPasswordL(); |
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315 |
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316 #endif // __MS_CHAP_WITH_LAN_MANAGER__ |
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317 } |
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318 |
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319 |
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320 inline void CPppMsChap::ProcessFailureMessageL( |
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321 const TDesC8& aFailureMessage, |
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322 TUint& aErrorCode, |
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323 TUint8& aRetryFlag, |
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324 TBool& aHasNewChallenge, |
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325 TDes8& aChallenge, |
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326 TUint8& aPasswordProtoVersion) |
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327 /** |
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328 Processes a MS-CHAP Failure Message. |
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329 @param aFailureMessage [in] A MS-CHAP Failure Message. The Failure |
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330 Message needs to be in the format specified in RFC 2433: |
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331 "E=eeeeeeeeee R=r C=cccccccccccccccc V=vvvvvvvvvv". |
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332 @param aErrorCode [out] The MS-CHAP Failure error code. |
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333 @param aRetryFlag [out] The retry flag. The flag will be set to |
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334 "1" if a retry is allowed, and "0" if not. When the authenticator |
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335 sets this flag to "1" it disables short timeouts, expecting the |
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336 peer to prompt the user for new credentials and resubmit the |
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337 response. |
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338 @param aHasNewChallenge [out] The flag that indicates if the |
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339 Failure Message contains a new Challenge Value. |
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340 @param aChallenge [out] The new Challenge Value, if the Failure |
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341 Message contains a one. |
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342 @param aPasswordProtoVersion [out] The password changing protocol |
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343 supported by the peer. |
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344 @internalComponent |
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345 */ |
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346 { |
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347 ASSERT(aChallenge.Length() == KPppMsChapChallengeSize); |
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348 |
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349 TLex8 input(aFailureMessage); |
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350 |
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351 if (input.Get() != 'E') |
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352 User::Leave(KErrGeneral); |
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353 |
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354 if (input.Get() != '=') |
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355 User::Leave(KErrGeneral); |
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356 |
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357 |
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358 // RFC 2433: ""eeeeeeeeee" is the ASCII representation of a decimal |
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359 // error code (need not be 10 digits) corresponding to one of those |
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360 // listed below, though implementations should deal with codes not on |
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361 // this list gracefully." |
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362 |
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363 |
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364 TInt ret; |
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365 if ((ret = input.Val(aErrorCode)) != KErrNone) |
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366 if (ret != KErrOverflow) |
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367 User::Leave(KErrGeneral); |
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368 else |
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369 // Gracefully handle unusually large, yet valid, MS-CHAP specific |
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370 // error code values. This code only handles the MS-CHAP specific |
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371 // error code values specified in RFC 2433. |
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372 aErrorCode=0; |
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373 |
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374 input.SkipSpace(); |
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375 |
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376 if (input.Get() != 'R') |
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377 User::Leave(KErrGeneral); |
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378 |
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379 if (input.Get() != '=') |
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380 User::Leave(KErrGeneral); |
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381 |
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382 if (input.Val(aRetryFlag, EDecimal)!=KErrNone) |
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383 User::Leave(KErrGeneral); |
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384 |
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385 input.SkipSpace(); |
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386 |
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387 switch (input.Get()) |
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388 { |
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389 case 'C': |
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390 { |
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391 if (input.Get() != '=') |
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392 User::Leave(KErrGeneral); |
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393 |
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394 TPtrC8 token(input.NextToken()); |
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395 // This field is 16 hexadecimal digits representing an ASCII |
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396 // representation of a new challenge value. Each octet is represented |
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397 // in 2 hexadecimal digits. |
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398 if (token.Length() != KPppMsChapChallengeSize*2) |
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399 User::Leave(KErrGeneral); |
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400 |
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401 TLex8 lex; |
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402 TUint8 octet; |
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403 TUint8* pChallengeOctet = |
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404 const_cast<TUint8*>(aChallenge.Ptr()); |
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405 TUint8 i = 0; |
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406 do |
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407 { |
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408 lex.Assign(token.Mid(i*2, 2)); |
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409 if (lex.Val(octet, EHex) != KErrNone) |
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410 User::Leave(KErrGeneral); |
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411 |
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412 *(pChallengeOctet + i) = octet; |
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413 } |
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414 while (++i < KPppMsChapChallengeSize); |
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415 |
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416 aHasNewChallenge = ETrue; |
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417 |
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418 input.SkipSpace(); |
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419 |
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420 if (input.Get()!='V') |
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421 { |
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422 aPasswordProtoVersion = 1; |
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423 User::Leave(KErrGeneral); |
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424 } |
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425 } |
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426 |
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427 // As specified in RFC 2433, the field containing the ASCII |
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428 // representation of a new challenge value is optional, so fall |
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429 // through. |
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430 |
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431 |
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432 case 'V': |
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433 |
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434 // RFC 2433: "The "vvvvvvvvvv" is the decimal version code (need not |
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435 // be 10 digits) indicating the MS-CHAP protocol version supported on |
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436 // the server. Currently, this is interesting only in selecting a |
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437 // Change Password packet type. If the field is not present the |
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438 // version should be assumed to be 1; since use of the version 1 |
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439 // Change Password packet has been deprecated, this field SHOULD |
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440 // always contain a value greater than or equal to 2." |
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441 |
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442 |
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443 aHasNewChallenge = EFalse; |
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444 |
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445 if (input.Get() != '=') |
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446 User::Leave(KErrGeneral); |
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447 |
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448 if ((ret=input.Val(aPasswordProtoVersion, |
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449 EDecimal)) != KErrNone) |
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450 if (ret!= KErrOverflow) |
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451 User::Leave(KErrGeneral); |
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452 else |
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453 // Gracefully handle unusually large, yet valid, password changing |
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454 // protocol version values. This code only handles the password |
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455 // changing protocol version codes values specified in RFC 2433. |
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456 aPasswordProtoVersion = 0; |
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457 |
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458 break; |
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459 |
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460 default: |
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461 aHasNewChallenge = EFalse; |
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462 aPasswordProtoVersion = 1; |
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463 } |
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464 } |
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465 |
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466 |
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467 inline void CPppMsChap::RetryPasswordL() |
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468 /** |
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469 Retries the authentication. |
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470 @internalComponent |
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471 */ |
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472 { |
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473 ++iCurrentId; |
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474 |
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475 iResponseRetryCount = 0; |
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476 RespondL(); |
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477 } |
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478 |
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479 |
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480 inline void CPppMsChap::NTChallengeResponseL(const TDesC8& aChallenge, |
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481 const TDesC16& aPassword, |
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482 TDes8& aResponse) |
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483 /** |
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484 Computes a MS-CHAP Windows NT compatible Challenge Response. |
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485 @param aChallenge [in] A MS-CHAP Challenge (8 octets). |
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486 @param aPassword [in] The Microsoft Windows NT password (0 to 256 |
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487 Unicode char). |
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488 @param aResponse [out] The MS-CHAP Windows NT compatible Challenge |
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489 Response (24 octets). |
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490 @note This function implements the NTChallengeResponse routine |
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491 specified in RFC 2433. |
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492 @internalComponent |
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493 */ |
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494 { |
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495 ASSERT(aChallenge.Length() == KPppMsChapChallengeSize); |
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496 ASSERT(aPassword.Length() <= KPppMsChapMaxNTPasswordLength); |
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497 ASSERT(aResponse.Length() == KPppMsChapNTResponseSize); |
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498 |
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499 HBufC8* paddedPasswordHashBuf = |
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500 HBufC8::NewLC(KPppMsChapPaddedHashSize); |
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501 TPtr8 paddablePasswordHash(paddedPasswordHashBuf->Des()); |
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502 |
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503 paddablePasswordHash.SetLength(KPppMsChapHashSize); |
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504 NtPasswordHashL(aPassword, paddablePasswordHash); |
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505 |
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506 ChallengeResponseL(aChallenge, |
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507 paddablePasswordHash, |
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508 aResponse); |
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509 |
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510 CleanupStack::PopAndDestroy(paddedPasswordHashBuf); |
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511 ASSERT(aResponse.Length() == KPppMsChapNTResponseSize); |
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512 } |
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513 |
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514 |
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515 inline void CPppMsChap::NtPasswordHashL(const TDesC16& aPassword, |
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516 TDes8& aPasswordHash) |
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517 /** |
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518 Computes the hash of the Microsoft Windows NT password using MD4. |
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519 @param aPassword [in] The Microsoft Windows NT password (0 to 256 |
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520 Unicode char). |
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521 @param aPasswordHash [out] The MD4 hash of the Microsoft Windows NT |
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522 password (16 octets). |
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523 @note This function implements the NtPasswordHash routine specified |
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524 in RFC 2433. |
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525 @internalComponent |
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526 */ |
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527 { |
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528 ASSERT(aPassword.Length() <= KPppMsChapMaxNTPasswordLength); |
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529 ASSERT(aPasswordHash.Length() == KPppMsChapHashSize); |
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530 |
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531 // The following code does not use the Symbian Security subsystem |
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532 // components, because they do not provide a MD4 implementation yet. |
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533 // This is a provisional solution until the Symbian Security subsystem |
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534 // components will provide a MD4 implementation. |
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535 |
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536 CMd4* md4 = CMd4::NewL(); |
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537 CleanupStack::PushL(md4); |
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538 |
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539 |
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540 // The following code assumes that the data in TDesC16 descriptors is |
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541 // stored in little endian byte order, which is currently a |
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542 // characteristic of Symbian OS, so the reinterpret_cast is assumed to |
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543 // be safe here. |
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544 md4->Input(TPtrC8(reinterpret_cast<const TUint8*>( |
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545 aPassword.Ptr()), |
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546 aPassword.Size())); |
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547 md4->Output(aPasswordHash); |
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548 |
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549 CleanupStack::PopAndDestroy(md4); |
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550 |
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551 ASSERT(aPasswordHash.Length() == KPppMsChapHashSize); |
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552 } |
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553 |
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554 |
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555 inline void CPppMsChap::ChallengeResponseL(const TDesC8& aChallenge, |
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556 TDes8& aPaddablePasswordHash, |
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557 TDes8& aResponse) |
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558 /** |
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559 Computes the Challenge Response. |
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560 @param aChallenge [in] A MS-CHAP Challenge (8 octets). |
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561 @param aPaddablePasswordHash [in/out] The hash of the password in a |
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562 paddable buffer (16 octets in a buffer with at least 21 octets |
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563 maximum length). |
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564 @param aResponse [out] The Challenge Response (24 octets). |
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565 @note This function implements the ChallengeResponse routine |
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566 specified in RFC 2433. |
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567 @internalComponent |
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568 */ |
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569 { |
|
570 ASSERT(aChallenge.Length()==KPppMsChapChallengeSize); |
|
571 ASSERT(aPaddablePasswordHash.Length()==KPppMsChapHashSize && |
|
572 aPaddablePasswordHash.MaxLength() >= |
|
573 KPppMsChapPaddedHashSize); |
|
574 ASSERT(aResponse.Length() == KPppMsChapNTResponseSize); |
|
575 |
|
576 // aPaddablePasswordHash contains the hash of the password (16 octets) |
|
577 // zero-padded to 21 octets |
|
578 |
|
579 // RFC 2433 - ChallengeResponse(): "Set ZPasswordHash to |
|
580 // PasswordHash zero-padded to 21 octets", i.e. 5 octets |
|
581 aPaddablePasswordHash.AppendFill(0, |
|
582 KPppMsChapPaddedHashSize - |
|
583 KPppMsChapHashSize); |
|
584 |
|
585 // The first 8 octets of aResponse |
|
586 TPtr8 responseChunk(const_cast<TUint8*>(aResponse.Ptr()), |
|
587 KPppDESKeySize, |
|
588 KPppDESKeySize); |
|
589 DesEncryptL(aChallenge, |
|
590 aPaddablePasswordHash.Left(KPppMsChapDESKeySize), |
|
591 responseChunk); |
|
592 |
|
593 // The second 8 octets of aResponse |
|
594 responseChunk.Set(const_cast<TUint8*>(aResponse.Ptr()) + |
|
595 KPppDESKeySize, |
|
596 KPppDESKeySize, |
|
597 KPppDESKeySize); |
|
598 DesEncryptL(aChallenge, |
|
599 aPaddablePasswordHash.Mid(KPppMsChapDESKeySize, |
|
600 KPppMsChapDESKeySize), |
|
601 responseChunk); |
|
602 |
|
603 // The third 8 octets of aResponse |
|
604 responseChunk.Set(const_cast<TUint8*>(aResponse.Ptr()) + |
|
605 2*KPppDESKeySize, KPppDESKeySize, KPppDESKeySize); |
|
606 DesEncryptL(aChallenge, |
|
607 aPaddablePasswordHash.Mid(2*KPppMsChapDESKeySize, |
|
608 KPppMsChapDESKeySize), |
|
609 responseChunk); |
|
610 |
|
611 |
|
612 // Restore the original length of the password hash |
|
613 aPaddablePasswordHash.SetLength(KPppMsChapHashSize); |
|
614 |
|
615 ASSERT(aResponse.Length() == KPppMsChapNTResponseSize); |
|
616 } |
|
617 |
|
618 void CPppMsChap::DesEncryptL(const TDesC8& aClear, |
|
619 const TDesC8& aKey, |
|
620 TDes8& aCypher) |
|
621 /** |
|
622 Encrypts a plaintext into a ciphertext using the DES encryption |
|
623 algorithm in ECB mode. |
|
624 @param aClear [in] A plaintext (8 octets). |
|
625 @param aKey [in] A key (7 octets). |
|
626 @param aCypher [out] The ciphertext (8 octets). |
|
627 @note This function implements the DesEncrypt routine specified in |
|
628 RFC 2433. |
|
629 @internalComponent |
|
630 */ |
|
631 { |
|
632 ASSERT(aClear.Length() == KPppMsChapDESClearTextSize); |
|
633 ASSERT(aKey.Length() == KPppMsChapDESKeySize); |
|
634 ASSERT(aCypher.Length() == KPppMsChapDESCipherTextSize); |
|
635 |
|
636 HBufC8* desKeyBuf=HBufC8::NewMaxLC(KPppDESKeySize); |
|
637 TPtr8 desKey(desKeyBuf->Des()); |
|
638 |
|
639 // RFC 2433: "Use the DES encryption algorithm [4] in ECB mode [10] to |
|
640 // encrypt Clear into Cypher such that Cypher can only be decrypted |
|
641 // back to Clear by providing Key. Note that the DES algorithm takes |
|
642 // as input a 64-bit stream where the 8th, 16th, 24th, etc. bits are |
|
643 // parity bits ignored by the encrypting algorithm. Unless you write |
|
644 // your own DES to accept 56-bit input without parity, you will need |
|
645 // to insert the parity bits yourself." |
|
646 |
|
647 MakeDesKey(aKey, desKey); |
|
648 |
|
649 |
|
650 CBlockTransformation* encryptor = |
|
651 CDESEncryptor::NewLC(desKey, EFalse); |
|
652 CPaddingNone* padding = CPaddingNone::NewLC(); |
|
653 CBufferedEncryptor* bufEncryptor = |
|
654 CBufferedEncryptor::NewL(encryptor, padding); |
|
655 CleanupStack::Pop(padding); |
|
656 CleanupStack::Pop(encryptor); |
|
657 CleanupStack::PushL(bufEncryptor); |
|
658 |
|
659 aCypher.Zero(); |
|
660 bufEncryptor->ProcessFinalL(aClear, aCypher); |
|
661 |
|
662 CleanupStack::PopAndDestroy(bufEncryptor); |
|
663 |
|
664 |
|
665 CleanupStack::PopAndDestroy(desKeyBuf); |
|
666 ASSERT(aCypher.Length() == KPppMsChapDESCipherTextSize); |
|
667 } |
|
668 |
|
669 |
|
670 inline void CPppMsChap::MakeDesKey(const TDesC8& aMsChapKey, |
|
671 TDes8& aDesKey) |
|
672 /** |
|
673 Creates a DES key by inserting the parity bits. The DES algorithm |
|
674 takes as input a 64-bit stream where the 8th, 16th, 24th, etc. bits |
|
675 are parity bits ignored by the encrypting algorithm. |
|
676 @param aMsChapKey [in] A key used by MS-CHAP for DES encryption. (7 |
|
677 octets). |
|
678 @param aDesKey [out] A DES key (8 octets). |
|
679 @internalComponent |
|
680 */ |
|
681 { |
|
682 ASSERT(aMsChapKey.Length() == KPppMsChapDESKeySize); |
|
683 ASSERT(aDesKey.Length() == KPppDESKeySize); |
|
684 |
|
685 // RFC 2433, RFC 2759: "Use the DES encryption algorithm [4] in ECB |
|
686 // mode [10] to encrypt Clear into Cypher such that Cypher can only be |
|
687 // decrypted back to Clear by providing Key. Note that the DES |
|
688 // algorithm takes as input a 64-bit stream where the 8th, 16th, 24th, |
|
689 // etc. bits are parity bits ignored by the encrypting algorithm. |
|
690 // Unless you write your own DES to accept 56-bit input without |
|
691 // parity, you will need to insert the parity bits yourself." |
|
692 |
|
693 TUint8* pdk = const_cast<TUint8*>(aDesKey.Ptr()); |
|
694 const TUint8* pmk = aMsChapKey.Ptr(); |
|
695 TUint16 high, low; |
|
696 TUint8 i = 0; |
|
697 do |
|
698 { |
|
699 high = *(pmk + i/8); |
|
700 low = *(pmk + i/8 + 1); |
|
701 *(pdk + i/7) = static_cast<TUint8>( |
|
702 ((high << 8 | low) >> (8 - i%8)) & 0xfe); |
|
703 i += 7; |
|
704 } |
|
705 while (i < 49); |
|
706 |
|
707 *(pdk + 7) = static_cast<TUint8>(*(pmk + 6) << 1 & 0xfe); |
|
708 |
|
709 ASSERT(aDesKey.Length() == KPppDESKeySize); |
|
710 } |
|
711 |
|
712 |
|
713 TInt CPppMsChap::TranslateMsChapError(TUint aMsChapError) |
|
714 /** |
|
715 Translates a MS-CHAP-V1 error code into a Symbian OS PPP NIF |
|
716 specific error code. |
|
717 @param aMsChapError A MS-CHAP-V1 error code. |
|
718 @return The Symbian OS PPP NIF specific error code corresponding to |
|
719 the MS-CHAP error code. |
|
720 @internalComponent |
|
721 */ |
|
722 { |
|
723 // Always return from every conditional branch of the following |
|
724 // switch statement |
|
725 switch(aMsChapError) |
|
726 { |
|
727 case KPppMsChapErrorRestrictedLogon: |
|
728 return KErrIfRestrictedLogonHours; |
|
729 |
|
730 case KPppMsChapErrorAccountDisabled: |
|
731 return KErrIfAccountDisabled; |
|
732 |
|
733 case KPppMsChapErrorPasswordExpired: |
|
734 return KErrIfPasswdExpired; |
|
735 |
|
736 case KPppMsChapErrorNoDialinPermission: |
|
737 return KErrIfNoDialInPermission; |
|
738 |
|
739 case KPppMsChapErrorChangingPassword: |
|
740 return KErrIfChangingPassword; |
|
741 |
|
742 case KPppMsChapAuthenticationFailure: |
|
743 return KErrIfAuthenticationFailure; |
|
744 } |
|
745 |
|
746 // If unknown MS-CHAP failure code |
|
747 // use KErrIfAuthenticationFailure |
|
748 // default: |
|
749 return KErrIfAuthenticationFailure; |
|
750 } |
|
751 |
|
752 |
|
753 #ifdef __MS_CHAP_WITH_LAN_MANAGER__ |
|
754 |
|
755 // NB The use of the LAN Manager compatible challenge response has |
|
756 // been deprecated according to RFC 2433. |
|
757 inline void CPppMsChap::LmChallengeResponseL(const TDesC8& aChallenge, |
|
758 const TDesC8& aPassword, |
|
759 TDes8& aResponse) |
|
760 /** |
|
761 Computes a MS-CHAP LAN Manager compatible Challenge Response. |
|
762 @param aChallenge [in] A MS-CHAP Challenge (8 octets). |
|
763 @param aPassword [in] The LAN Manager password (0 to 14 OEM char). |
|
764 @param aResponse [out] The MS-CHAP LAN Manager compatible Challenge |
|
765 Response (24 octets). |
|
766 @note This function implements the LmChallengeResponse routine |
|
767 specified in RFC 2433. |
|
768 @note The use of the LAN Manager compatible Challenge Response has |
|
769 been deprecated according to RFC 2433. |
|
770 @internalComponent |
|
771 */ |
|
772 { |
|
773 ASSERT(aChallenge.Length() == KPppMsChapChallengeSize); |
|
774 ASSERT(aPassword.Length() <= |
|
775 KPppMsChapMaxLANManagerPasswordLength); |
|
776 ASSERT(aResponse.Length() == KPppMsChapLanManResponseSize); |
|
777 |
|
778 HBufC8* paddedPasswordHashBuf = |
|
779 HBufC8::NewLC(KPppMsChapPaddedHashSize); |
|
780 TPtr8 paddablePasswordHash(paddedPasswordHashBuf->Des()); |
|
781 |
|
782 paddablePasswordHash.SetLength(KPppMsChapHashSize); |
|
783 LmPasswordHashL(aPassword, paddablePasswordHash); |
|
784 |
|
785 ChallengeResponseL(aChallenge, |
|
786 paddablePasswordHash, |
|
787 aResponse); |
|
788 |
|
789 CleanupStack::PopAndDestroy(paddedPasswordHashBuf); |
|
790 ASSERT(aResponse.Length() == KPppMsChapLanManResponseSize); |
|
791 } |
|
792 |
|
793 |
|
794 // NB The use of the LAN Manager compatible challenge response has |
|
795 // been deprecated according to RFC 2433. |
|
796 inline void CPppMsChap::LmPasswordHashL(const TDesC8& aPassword, |
|
797 TDes8& aPasswordHash) |
|
798 /** |
|
799 Computes the hash of the LAN Manager password using DES. |
|
800 @param aPassword [in] The LAN Manager password (0 to 14 OEM char). |
|
801 @param aPasswordHash [out] The DES hash of the LAN Manager password |
|
802 (16 octets). |
|
803 @note This function implements the LmPasswordHash routine specified |
|
804 in RFC 2433. |
|
805 @note The use of the LAN Manager compatible Challenge Response has |
|
806 been deprecated according to RFC 2433. |
|
807 @internalComponent |
|
808 */ |
|
809 { |
|
810 ASSERT(aPassword.Length() <= |
|
811 KPppMsChapMaxLANManagerPasswordLength); |
|
812 ASSERT(aPasswordHash.Length() == KPppMsChapHashSize); |
|
813 |
|
814 HBufC8* ucasePasswordBuf = |
|
815 HBufC8::NewLC(KPppMsChapMaxLANManagerPasswordLength); |
|
816 TPtr8 ucasePassword(ucasePasswordBuf->Des()); |
|
817 ucasePassword.Copy(aPassword); |
|
818 ucasePassword.UpperCase(); |
|
819 ucasePassword.AppendFill(0, |
|
820 KPppMsChapMaxLANManagerPasswordLength - |
|
821 ucasePassword.Length()); |
|
822 |
|
823 // The first 8 octets of aResponse |
|
824 TPtr8 responseChunk(const_cast<TUint8*>(aPasswordHash.Ptr()), |
|
825 KPppDESKeySize, KPppDESKeySize); |
|
826 DesHashL(ucasePassword.Left(KPppMsChapDESKeySize), |
|
827 responseChunk); |
|
828 |
|
829 responseChunk.Set(const_cast<TUint8*>(aPasswordHash.Ptr()) + |
|
830 KPppDESKeySize, |
|
831 KPppDESKeySize, |
|
832 KPppDESKeySize); |
|
833 DesHashL(ucasePassword.Mid(KPppMsChapDESKeySize, |
|
834 KPppMsChapDESKeySize), |
|
835 responseChunk); |
|
836 |
|
837 CleanupStack::PopAndDestroy(ucasePasswordBuf); |
|
838 ASSERT(aPasswordHash.Length() == KPppMsChapHashSize); |
|
839 } |
|
840 |
|
841 // NB The use of the LAN Manager compatible challenge response has |
|
842 // been deprecated according to RFC 2433. |
|
843 inline void CPppMsChap::DesHashL(const TDesC8& aClear, TDes8& aCypher) |
|
844 /** |
|
845 Makes aCypher an irreversibly encrypted form of aClear by |
|
846 encrypting known text using aClear as the secret key. The known |
|
847 text consists of the string "KGS!@#$%". |
|
848 @param aClear [in] A plaintext used as the secret key for |
|
849 encryption (7 octets). |
|
850 @param aCypher [out] The ciphertext (8 octets). |
|
851 @note This function implements the DesHash routine specified in RFC |
|
852 2433. |
|
853 @note The use of the LAN Manager compatible challenge response has |
|
854 been deprecated according to RFC 2433. |
|
855 @internalComponent |
|
856 */ |
|
857 { |
|
858 ASSERT(aClear.Length() == KPppMsChapDESKeySize); |
|
859 ASSERT(aCypher.Length() == KPppMsChapDESCipherTextSize); |
|
860 |
|
861 HBufC8* desKeyBuf = HBufC8::NewMaxLC(KPppDESKeySize); |
|
862 TPtr8 desKey(desKeyBuf->Des()); |
|
863 |
|
864 MakeDesKey(aClear, desKey); |
|
865 |
|
866 // A magic string literal specified in RFC 2433 used as clear text for |
|
867 // making aCypher an irreversibly encrypted form of aClear by |
|
868 // encrypting this clear text using aClear as the secret key. |
|
869 _LIT8(KStdText, "KGS!@#$%"); |
|
870 |
|
871 |
|
872 CBlockTransformation* encryptor = |
|
873 CDESEncryptor::NewLC(desKey, EFalse); |
|
874 CPaddingNone* padding = CPaddingNone::NewLC(); |
|
875 CBufferedEncryptor* bufEncryptor = |
|
876 CBufferedEncryptor::NewL(encryptor, padding); |
|
877 CleanupStack::Pop(padding); |
|
878 CleanupStack::Pop(encryptor); |
|
879 CleanupStack::PushL(bufEncryptor); |
|
880 |
|
881 aCypher.Zero(); |
|
882 bufEncryptor->ProcessFinalL(KStdText, aCypher); |
|
883 |
|
884 CleanupStack::PopAndDestroy(bufEncryptor); |
|
885 |
|
886 |
|
887 CleanupStack::PopAndDestroy(desKeyBuf); |
|
888 ASSERT(aCypher.Length() == KPppMsChapDESCipherTextSize); |
|
889 } |
|
890 |
|
891 #endif // __MS_CHAP_WITH_LAN_MANAGER__ |