1 | /*
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2 | * chap_ms.c - Microsoft MS-CHAP compatible implementation.
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3 | *
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4 | * Copyright (c) 1995 Eric Rosenquist. All rights reserved.
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5 | *
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6 | * Redistribution and use in source and binary forms, with or without
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7 | * modification, are permitted provided that the following conditions
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8 | * are met:
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9 | *
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10 | * 1. Redistributions of source code must retain the above copyright
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11 | * notice, this list of conditions and the following disclaimer.
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12 | *
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13 | * 2. Redistributions in binary form must reproduce the above copyright
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14 | * notice, this list of conditions and the following disclaimer in
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15 | * the documentation and/or other materials provided with the
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16 | * distribution.
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17 | *
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18 | * 3. The name(s) of the authors of this software must not be used to
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19 | * endorse or promote products derived from this software without
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20 | * prior written permission.
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21 | *
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22 | * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
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23 | * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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24 | * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
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25 | * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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26 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
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27 | * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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28 | * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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29 | */
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30 |
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31 | /*
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32 | * Modifications by Lauri Pesonen / lpesonen@clinet.fi, april 1997
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33 | *
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34 | * Implemented LANManager type password response to MS-CHAP challenges.
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35 | * Now pppd provides both NT style and LANMan style blocks, and the
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36 | * prefered is set by option "ms-lanman". Default is to use NT.
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37 | * The hash text (StdText) was taken from Win95 RASAPI32.DLL.
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38 | *
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39 | * You should also use DOMAIN\\USERNAME as described in README.MSCHAP80
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40 | */
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41 |
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42 | /*
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43 | * Modifications by Frank Cusack, frank@google.com, March 2002.
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44 | *
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45 | * Implemented MS-CHAPv2 functionality, heavily based on sample
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46 | * implementation in RFC 2759. Implemented MPPE functionality,
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47 | * heavily based on sample implementation in RFC 3079.
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48 | *
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49 | * Copyright (c) 2002 Google, Inc. All rights reserved.
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50 | *
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51 | * Redistribution and use in source and binary forms, with or without
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52 | * modification, are permitted provided that the following conditions
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53 | * are met:
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54 | *
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55 | * 1. Redistributions of source code must retain the above copyright
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56 | * notice, this list of conditions and the following disclaimer.
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57 | *
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58 | * 2. Redistributions in binary form must reproduce the above copyright
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59 | * notice, this list of conditions and the following disclaimer in
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60 | * the documentation and/or other materials provided with the
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61 | * distribution.
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62 | *
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63 | * 3. The name(s) of the authors of this software must not be used to
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64 | * endorse or promote products derived from this software without
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65 | * prior written permission.
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66 | *
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67 | * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
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68 | * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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69 | * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
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70 | * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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71 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
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72 | * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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73 | * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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74 | *
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75 | */
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76 |
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77 | #include "netif/ppp/ppp_opts.h"
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78 | #if PPP_SUPPORT && MSCHAP_SUPPORT /* don't build if not configured for use in lwipopts.h */
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79 |
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80 | #if 0 /* UNUSED */
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81 | #include <stdio.h>
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82 | #include <stdlib.h>
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83 | #include <string.h>
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84 | #include <ctype.h>
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85 | #include <sys/types.h>
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86 | #include <sys/time.h>
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87 | #include <unistd.h>
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88 | #endif /* UNUSED */
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89 |
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90 | #include "netif/ppp/ppp_impl.h"
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91 |
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92 | #include "netif/ppp/chap-new.h"
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93 | #include "netif/ppp/chap_ms.h"
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94 | #include "netif/ppp/pppcrypt.h"
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95 | #include "netif/ppp/magic.h"
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96 | #if MPPE_SUPPORT
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97 | #include "netif/ppp/mppe.h" /* For mppe_sha1_pad*, mppe_set_key() */
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98 | #endif /* MPPE_SUPPORT */
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99 |
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100 | #define SHA1_SIGNATURE_SIZE 20
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101 | #define MD4_SIGNATURE_SIZE 16 /* 16 bytes in a MD4 message digest */
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102 | #define MAX_NT_PASSWORD 256 /* Max (Unicode) chars in an NT pass */
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103 |
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104 | #define MS_CHAP_RESPONSE_LEN 49 /* Response length for MS-CHAP */
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105 | #define MS_CHAP2_RESPONSE_LEN 49 /* Response length for MS-CHAPv2 */
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106 | #define MS_AUTH_RESPONSE_LENGTH 40 /* MS-CHAPv2 authenticator response, */
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107 | /* as ASCII */
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108 |
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109 | /* Error codes for MS-CHAP failure messages. */
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110 | #define MS_CHAP_ERROR_RESTRICTED_LOGON_HOURS 646
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111 | #define MS_CHAP_ERROR_ACCT_DISABLED 647
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112 | #define MS_CHAP_ERROR_PASSWD_EXPIRED 648
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113 | #define MS_CHAP_ERROR_NO_DIALIN_PERMISSION 649
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114 | #define MS_CHAP_ERROR_AUTHENTICATION_FAILURE 691
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115 | #define MS_CHAP_ERROR_CHANGING_PASSWORD 709
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116 |
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117 | /*
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118 | * Offsets within the response field for MS-CHAP
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119 | */
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120 | #define MS_CHAP_LANMANRESP 0
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121 | #define MS_CHAP_LANMANRESP_LEN 24
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122 | #define MS_CHAP_NTRESP 24
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123 | #define MS_CHAP_NTRESP_LEN 24
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124 | #define MS_CHAP_USENT 48
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125 |
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126 | /*
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127 | * Offsets within the response field for MS-CHAP2
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128 | */
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129 | #define MS_CHAP2_PEER_CHALLENGE 0
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130 | #define MS_CHAP2_PEER_CHAL_LEN 16
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131 | #define MS_CHAP2_RESERVED_LEN 8
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132 | #define MS_CHAP2_NTRESP 24
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133 | #define MS_CHAP2_NTRESP_LEN 24
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134 | #define MS_CHAP2_FLAGS 48
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135 |
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136 | #if MPPE_SUPPORT
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137 | #if 0 /* UNUSED */
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138 | /* These values are the RADIUS attribute values--see RFC 2548. */
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139 | #define MPPE_ENC_POL_ENC_ALLOWED 1
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140 | #define MPPE_ENC_POL_ENC_REQUIRED 2
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141 | #define MPPE_ENC_TYPES_RC4_40 2
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142 | #define MPPE_ENC_TYPES_RC4_128 4
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143 |
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144 | /* used by plugins (using above values) */
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145 | extern void set_mppe_enc_types(int, int);
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146 | #endif /* UNUSED */
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147 | #endif /* MPPE_SUPPORT */
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148 |
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149 | /* Are we the authenticator or authenticatee? For MS-CHAPv2 key derivation. */
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150 | #define MS_CHAP2_AUTHENTICATEE 0
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151 | #define MS_CHAP2_AUTHENTICATOR 1
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152 |
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153 | static void ascii2unicode (const char[], int, u_char[]);
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154 | static void NTPasswordHash (u_char *, int, u_char[MD4_SIGNATURE_SIZE]);
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155 | static void ChallengeResponse (const u_char *, const u_char *, u_char[24]);
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156 | static void ChallengeHash (const u_char[16], const u_char *, const char *, u_char[8]);
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157 | static void ChapMS_NT (const u_char *, const char *, int, u_char[24]);
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158 | static void ChapMS2_NT (const u_char *, const u_char[16], const char *, const char *, int,
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159 | u_char[24]);
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160 | static void GenerateAuthenticatorResponsePlain
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161 | (const char*, int, u_char[24], const u_char[16], const u_char *,
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162 | const char *, u_char[41]);
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163 | #ifdef MSLANMAN
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164 | static void ChapMS_LANMan (u_char *, char *, int, u_char *);
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165 | #endif
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166 |
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167 | static void GenerateAuthenticatorResponse(const u_char PasswordHashHash[MD4_SIGNATURE_SIZE],
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168 | u_char NTResponse[24], const u_char PeerChallenge[16],
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169 | const u_char *rchallenge, const char *username,
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170 | u_char authResponse[MS_AUTH_RESPONSE_LENGTH+1]);
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171 |
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172 | #if MPPE_SUPPORT
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173 | static void Set_Start_Key (ppp_pcb *pcb, const u_char *, const char *, int);
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174 | static void SetMasterKeys (ppp_pcb *pcb, const char *, int, u_char[24], int);
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175 | #endif /* MPPE_SUPPORT */
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176 |
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177 | static void ChapMS (ppp_pcb *pcb, const u_char *, const char *, int, u_char *);
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178 | static void ChapMS2 (ppp_pcb *pcb, const u_char *, const u_char *, const char *, const char *, int,
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179 | u_char *, u_char[MS_AUTH_RESPONSE_LENGTH+1], int);
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180 |
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181 | #ifdef MSLANMAN
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182 | bool ms_lanman = 0; /* Use LanMan password instead of NT */
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183 | /* Has meaning only with MS-CHAP challenges */
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184 | #endif
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185 |
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186 | #if MPPE_SUPPORT
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187 | #ifdef DEBUGMPPEKEY
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188 | /* For MPPE debug */
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189 | /* Use "[]|}{?/><,`!2&&(" (sans quotes) for RFC 3079 MS-CHAPv2 test value */
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190 | static char *mschap_challenge = NULL;
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191 | /* Use "!@\#$%^&*()_+:3|~" (sans quotes, backslash is to escape #) for ... */
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192 | static char *mschap2_peer_challenge = NULL;
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193 | #endif
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194 |
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195 | #include "netif/ppp/fsm.h" /* Need to poke MPPE options */
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196 | #include "netif/ppp/ccp.h"
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197 | #endif /* MPPE_SUPPORT */
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198 |
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199 | #if PPP_OPTIONS
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200 | /*
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201 | * Command-line options.
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202 | */
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203 | static option_t chapms_option_list[] = {
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204 | #ifdef MSLANMAN
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205 | { "ms-lanman", o_bool, &ms_lanman,
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206 | "Use LanMan passwd when using MS-CHAP", 1 },
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207 | #endif
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208 | #ifdef DEBUGMPPEKEY
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209 | { "mschap-challenge", o_string, &mschap_challenge,
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210 | "specify CHAP challenge" },
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211 | { "mschap2-peer-challenge", o_string, &mschap2_peer_challenge,
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212 | "specify CHAP peer challenge" },
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213 | #endif
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214 | { NULL }
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215 | };
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216 | #endif /* PPP_OPTIONS */
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217 |
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218 | #if PPP_SERVER
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219 | /*
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220 | * chapms_generate_challenge - generate a challenge for MS-CHAP.
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221 | * For MS-CHAP the challenge length is fixed at 8 bytes.
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222 | * The length goes in challenge[0] and the actual challenge starts
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223 | * at challenge[1].
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224 | */
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225 | static void chapms_generate_challenge(ppp_pcb *pcb, unsigned char *challenge) {
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226 | LWIP_UNUSED_ARG(pcb);
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227 |
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228 | *challenge++ = 8;
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229 | #ifdef DEBUGMPPEKEY
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230 | if (mschap_challenge && strlen(mschap_challenge) == 8)
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231 | memcpy(challenge, mschap_challenge, 8);
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232 | else
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233 | #endif
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234 | magic_random_bytes(challenge, 8);
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235 | }
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236 |
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237 | static void chapms2_generate_challenge(ppp_pcb *pcb, unsigned char *challenge) {
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238 | LWIP_UNUSED_ARG(pcb);
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239 |
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240 | *challenge++ = 16;
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241 | #ifdef DEBUGMPPEKEY
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242 | if (mschap_challenge && strlen(mschap_challenge) == 16)
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243 | memcpy(challenge, mschap_challenge, 16);
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244 | else
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245 | #endif
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246 | magic_random_bytes(challenge, 16);
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247 | }
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248 |
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249 | static int chapms_verify_response(ppp_pcb *pcb, int id, const char *name,
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250 | const unsigned char *secret, int secret_len,
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251 | const unsigned char *challenge, const unsigned char *response,
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252 | char *message, int message_space) {
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253 | unsigned char md[MS_CHAP_RESPONSE_LEN];
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254 | int diff;
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255 | int challenge_len, response_len;
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256 | LWIP_UNUSED_ARG(id);
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257 | LWIP_UNUSED_ARG(name);
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258 |
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259 | challenge_len = *challenge++; /* skip length, is 8 */
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260 | response_len = *response++;
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261 | if (response_len != MS_CHAP_RESPONSE_LEN)
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262 | goto bad;
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263 |
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264 | #ifndef MSLANMAN
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265 | if (!response[MS_CHAP_USENT]) {
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266 | /* Should really propagate this into the error packet. */
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267 | ppp_notice("Peer request for LANMAN auth not supported");
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268 | goto bad;
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269 | }
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270 | #endif
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271 |
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272 | /* Generate the expected response. */
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273 | ChapMS(pcb, (const u_char *)challenge, (const char *)secret, secret_len, md);
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274 |
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275 | #ifdef MSLANMAN
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276 | /* Determine which part of response to verify against */
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277 | if (!response[MS_CHAP_USENT])
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278 | diff = memcmp(&response[MS_CHAP_LANMANRESP],
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279 | &md[MS_CHAP_LANMANRESP], MS_CHAP_LANMANRESP_LEN);
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280 | else
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281 | #endif
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282 | diff = memcmp(&response[MS_CHAP_NTRESP], &md[MS_CHAP_NTRESP],
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283 | MS_CHAP_NTRESP_LEN);
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284 |
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285 | if (diff == 0) {
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286 | ppp_slprintf(message, message_space, "Access granted");
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287 | return 1;
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288 | }
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289 |
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290 | bad:
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291 | /* See comments below for MS-CHAP V2 */
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292 | ppp_slprintf(message, message_space, "E=691 R=1 C=%0.*B V=0",
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293 | challenge_len, challenge);
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294 | return 0;
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295 | }
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296 |
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297 | static int chapms2_verify_response(ppp_pcb *pcb, int id, const char *name,
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298 | const unsigned char *secret, int secret_len,
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299 | const unsigned char *challenge, const unsigned char *response,
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300 | char *message, int message_space) {
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301 | unsigned char md[MS_CHAP2_RESPONSE_LEN];
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302 | char saresponse[MS_AUTH_RESPONSE_LENGTH+1];
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303 | int challenge_len, response_len;
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304 | LWIP_UNUSED_ARG(id);
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305 |
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306 | challenge_len = *challenge++; /* skip length, is 16 */
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307 | response_len = *response++;
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308 | if (response_len != MS_CHAP2_RESPONSE_LEN)
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309 | goto bad; /* not even the right length */
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310 |
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311 | /* Generate the expected response and our mutual auth. */
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312 | ChapMS2(pcb, (const u_char*)challenge, (const u_char*)&response[MS_CHAP2_PEER_CHALLENGE], name,
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313 | (const char *)secret, secret_len, md,
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314 | (unsigned char *)saresponse, MS_CHAP2_AUTHENTICATOR);
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315 |
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316 | /* compare MDs and send the appropriate status */
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317 | /*
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318 | * Per RFC 2759, success message must be formatted as
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319 | * "S=<auth_string> M=<message>"
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320 | * where
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321 | * <auth_string> is the Authenticator Response (mutual auth)
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322 | * <message> is a text message
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323 | *
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324 | * However, some versions of Windows (win98 tested) do not know
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325 | * about the M=<message> part (required per RFC 2759) and flag
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326 | * it as an error (reported incorrectly as an encryption error
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327 | * to the user). Since the RFC requires it, and it can be
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328 | * useful information, we supply it if the peer is a conforming
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329 | * system. Luckily (?), win98 sets the Flags field to 0x04
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330 | * (contrary to RFC requirements) so we can use that to
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331 | * distinguish between conforming and non-conforming systems.
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332 | *
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333 | * Special thanks to Alex Swiridov <say@real.kharkov.ua> for
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334 | * help debugging this.
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335 | */
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336 | if (memcmp(&md[MS_CHAP2_NTRESP], &response[MS_CHAP2_NTRESP],
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337 | MS_CHAP2_NTRESP_LEN) == 0) {
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338 | if (response[MS_CHAP2_FLAGS])
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339 | ppp_slprintf(message, message_space, "S=%s", saresponse);
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340 | else
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341 | ppp_slprintf(message, message_space, "S=%s M=%s",
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342 | saresponse, "Access granted");
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343 | return 1;
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344 | }
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345 |
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346 | bad:
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347 | /*
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348 | * Failure message must be formatted as
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349 | * "E=e R=r C=c V=v M=m"
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350 | * where
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351 | * e = error code (we use 691, ERROR_AUTHENTICATION_FAILURE)
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352 | * r = retry (we use 1, ok to retry)
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353 | * c = challenge to use for next response, we reuse previous
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354 | * v = Change Password version supported, we use 0
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355 | * m = text message
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356 | *
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357 | * The M=m part is only for MS-CHAPv2. Neither win2k nor
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358 | * win98 (others untested) display the message to the user anyway.
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359 | * They also both ignore the E=e code.
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360 | *
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361 | * Note that it's safe to reuse the same challenge as we don't
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362 | * actually accept another response based on the error message
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363 | * (and no clients try to resend a response anyway).
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364 | *
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365 | * Basically, this whole bit is useless code, even the small
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366 | * implementation here is only because of overspecification.
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367 | */
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368 | ppp_slprintf(message, message_space, "E=691 R=1 C=%0.*B V=0 M=%s",
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369 | challenge_len, challenge, "Access denied");
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370 | return 0;
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371 | }
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372 | #endif /* PPP_SERVER */
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373 |
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374 | static void chapms_make_response(ppp_pcb *pcb, unsigned char *response, int id, const char *our_name,
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375 | const unsigned char *challenge, const char *secret, int secret_len,
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376 | unsigned char *private_) {
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377 | LWIP_UNUSED_ARG(id);
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378 | LWIP_UNUSED_ARG(our_name);
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379 | LWIP_UNUSED_ARG(private_);
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380 | challenge++; /* skip length, should be 8 */
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381 | *response++ = MS_CHAP_RESPONSE_LEN;
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382 | ChapMS(pcb, challenge, secret, secret_len, response);
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383 | }
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384 |
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385 | static void chapms2_make_response(ppp_pcb *pcb, unsigned char *response, int id, const char *our_name,
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386 | const unsigned char *challenge, const char *secret, int secret_len,
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387 | unsigned char *private_) {
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388 | LWIP_UNUSED_ARG(id);
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389 | challenge++; /* skip length, should be 16 */
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390 | *response++ = MS_CHAP2_RESPONSE_LEN;
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391 | ChapMS2(pcb, challenge,
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392 | #ifdef DEBUGMPPEKEY
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393 | mschap2_peer_challenge,
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394 | #else
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395 | NULL,
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396 | #endif
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397 | our_name, secret, secret_len, response, private_,
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398 | MS_CHAP2_AUTHENTICATEE);
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399 | }
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400 |
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401 | static int chapms2_check_success(ppp_pcb *pcb, unsigned char *msg, int len, unsigned char *private_) {
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402 | LWIP_UNUSED_ARG(pcb);
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403 |
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404 | if ((len < MS_AUTH_RESPONSE_LENGTH + 2) ||
|
---|
405 | strncmp((char *)msg, "S=", 2) != 0) {
|
---|
406 | /* Packet does not start with "S=" */
|
---|
407 | ppp_error("MS-CHAPv2 Success packet is badly formed.");
|
---|
408 | return 0;
|
---|
409 | }
|
---|
410 | msg += 2;
|
---|
411 | len -= 2;
|
---|
412 | if (len < MS_AUTH_RESPONSE_LENGTH
|
---|
413 | || memcmp(msg, private_, MS_AUTH_RESPONSE_LENGTH)) {
|
---|
414 | /* Authenticator Response did not match expected. */
|
---|
415 | ppp_error("MS-CHAPv2 mutual authentication failed.");
|
---|
416 | return 0;
|
---|
417 | }
|
---|
418 | /* Authenticator Response matches. */
|
---|
419 | msg += MS_AUTH_RESPONSE_LENGTH; /* Eat it */
|
---|
420 | len -= MS_AUTH_RESPONSE_LENGTH;
|
---|
421 | if ((len >= 3) && !strncmp((char *)msg, " M=", 3)) {
|
---|
422 | msg += 3; /* Eat the delimiter */
|
---|
423 | } else if (len) {
|
---|
424 | /* Packet has extra text which does not begin " M=" */
|
---|
425 | ppp_error("MS-CHAPv2 Success packet is badly formed.");
|
---|
426 | return 0;
|
---|
427 | }
|
---|
428 | return 1;
|
---|
429 | }
|
---|
430 |
|
---|
431 | static void chapms_handle_failure(ppp_pcb *pcb, unsigned char *inp, int len) {
|
---|
432 | int err;
|
---|
433 | const char *p;
|
---|
434 | char msg[64];
|
---|
435 | LWIP_UNUSED_ARG(pcb);
|
---|
436 |
|
---|
437 | /* We want a null-terminated string for strxxx(). */
|
---|
438 | len = LWIP_MIN(len, 63);
|
---|
439 | MEMCPY(msg, inp, len);
|
---|
440 | msg[len] = 0;
|
---|
441 | p = msg;
|
---|
442 |
|
---|
443 | /*
|
---|
444 | * Deal with MS-CHAP formatted failure messages; just print the
|
---|
445 | * M=<message> part (if any). For MS-CHAP we're not really supposed
|
---|
446 | * to use M=<message>, but it shouldn't hurt. See
|
---|
447 | * chapms[2]_verify_response.
|
---|
448 | */
|
---|
449 | if (!strncmp(p, "E=", 2))
|
---|
450 | err = strtol(p+2, NULL, 10); /* Remember the error code. */
|
---|
451 | else
|
---|
452 | goto print_msg; /* Message is badly formatted. */
|
---|
453 |
|
---|
454 | if (len && ((p = strstr(p, " M=")) != NULL)) {
|
---|
455 | /* M=<message> field found. */
|
---|
456 | p += 3;
|
---|
457 | } else {
|
---|
458 | /* No M=<message>; use the error code. */
|
---|
459 | switch (err) {
|
---|
460 | case MS_CHAP_ERROR_RESTRICTED_LOGON_HOURS:
|
---|
461 | p = "E=646 Restricted logon hours";
|
---|
462 | break;
|
---|
463 |
|
---|
464 | case MS_CHAP_ERROR_ACCT_DISABLED:
|
---|
465 | p = "E=647 Account disabled";
|
---|
466 | break;
|
---|
467 |
|
---|
468 | case MS_CHAP_ERROR_PASSWD_EXPIRED:
|
---|
469 | p = "E=648 Password expired";
|
---|
470 | break;
|
---|
471 |
|
---|
472 | case MS_CHAP_ERROR_NO_DIALIN_PERMISSION:
|
---|
473 | p = "E=649 No dialin permission";
|
---|
474 | break;
|
---|
475 |
|
---|
476 | case MS_CHAP_ERROR_AUTHENTICATION_FAILURE:
|
---|
477 | p = "E=691 Authentication failure";
|
---|
478 | break;
|
---|
479 |
|
---|
480 | case MS_CHAP_ERROR_CHANGING_PASSWORD:
|
---|
481 | /* Should never see this, we don't support Change Password. */
|
---|
482 | p = "E=709 Error changing password";
|
---|
483 | break;
|
---|
484 |
|
---|
485 | default:
|
---|
486 | ppp_error("Unknown MS-CHAP authentication failure: %.*v",
|
---|
487 | len, inp);
|
---|
488 | return;
|
---|
489 | }
|
---|
490 | }
|
---|
491 | print_msg:
|
---|
492 | if (p != NULL)
|
---|
493 | ppp_error("MS-CHAP authentication failed: %v", p);
|
---|
494 | }
|
---|
495 |
|
---|
496 | static void ChallengeResponse(const u_char *challenge,
|
---|
497 | const u_char PasswordHash[MD4_SIGNATURE_SIZE],
|
---|
498 | u_char response[24]) {
|
---|
499 | u_char ZPasswordHash[21];
|
---|
500 | lwip_des_context des;
|
---|
501 | u_char des_key[8];
|
---|
502 |
|
---|
503 | BZERO(ZPasswordHash, sizeof(ZPasswordHash));
|
---|
504 | MEMCPY(ZPasswordHash, PasswordHash, MD4_SIGNATURE_SIZE);
|
---|
505 |
|
---|
506 | #if 0
|
---|
507 | dbglog("ChallengeResponse - ZPasswordHash %.*B",
|
---|
508 | sizeof(ZPasswordHash), ZPasswordHash);
|
---|
509 | #endif
|
---|
510 |
|
---|
511 | pppcrypt_56_to_64_bit_key(ZPasswordHash + 0, des_key);
|
---|
512 | lwip_des_init(&des);
|
---|
513 | lwip_des_setkey_enc(&des, des_key);
|
---|
514 | lwip_des_crypt_ecb(&des, challenge, response +0);
|
---|
515 | lwip_des_free(&des);
|
---|
516 |
|
---|
517 | pppcrypt_56_to_64_bit_key(ZPasswordHash + 7, des_key);
|
---|
518 | lwip_des_init(&des);
|
---|
519 | lwip_des_setkey_enc(&des, des_key);
|
---|
520 | lwip_des_crypt_ecb(&des, challenge, response +8);
|
---|
521 | lwip_des_free(&des);
|
---|
522 |
|
---|
523 | pppcrypt_56_to_64_bit_key(ZPasswordHash + 14, des_key);
|
---|
524 | lwip_des_init(&des);
|
---|
525 | lwip_des_setkey_enc(&des, des_key);
|
---|
526 | lwip_des_crypt_ecb(&des, challenge, response +16);
|
---|
527 | lwip_des_free(&des);
|
---|
528 |
|
---|
529 | #if 0
|
---|
530 | dbglog("ChallengeResponse - response %.24B", response);
|
---|
531 | #endif
|
---|
532 | }
|
---|
533 |
|
---|
534 | static void ChallengeHash(const u_char PeerChallenge[16], const u_char *rchallenge,
|
---|
535 | const char *username, u_char Challenge[8]) {
|
---|
536 | lwip_sha1_context sha1Context;
|
---|
537 | u_char sha1Hash[SHA1_SIGNATURE_SIZE];
|
---|
538 | const char *user;
|
---|
539 |
|
---|
540 | /* remove domain from "domain\username" */
|
---|
541 | if ((user = strrchr(username, '\\')) != NULL)
|
---|
542 | ++user;
|
---|
543 | else
|
---|
544 | user = username;
|
---|
545 |
|
---|
546 | lwip_sha1_init(&sha1Context);
|
---|
547 | lwip_sha1_starts(&sha1Context);
|
---|
548 | lwip_sha1_update(&sha1Context, PeerChallenge, 16);
|
---|
549 | lwip_sha1_update(&sha1Context, rchallenge, 16);
|
---|
550 | lwip_sha1_update(&sha1Context, (const unsigned char*)user, strlen(user));
|
---|
551 | lwip_sha1_finish(&sha1Context, sha1Hash);
|
---|
552 | lwip_sha1_free(&sha1Context);
|
---|
553 |
|
---|
554 | MEMCPY(Challenge, sha1Hash, 8);
|
---|
555 | }
|
---|
556 |
|
---|
557 | /*
|
---|
558 | * Convert the ASCII version of the password to Unicode.
|
---|
559 | * This implicitly supports 8-bit ISO8859/1 characters.
|
---|
560 | * This gives us the little-endian representation, which
|
---|
561 | * is assumed by all M$ CHAP RFCs. (Unicode byte ordering
|
---|
562 | * is machine-dependent.)
|
---|
563 | */
|
---|
564 | static void ascii2unicode(const char ascii[], int ascii_len, u_char unicode[]) {
|
---|
565 | int i;
|
---|
566 |
|
---|
567 | BZERO(unicode, ascii_len * 2);
|
---|
568 | for (i = 0; i < ascii_len; i++)
|
---|
569 | unicode[i * 2] = (u_char) ascii[i];
|
---|
570 | }
|
---|
571 |
|
---|
572 | static void NTPasswordHash(u_char *secret, int secret_len, u_char hash[MD4_SIGNATURE_SIZE]) {
|
---|
573 | lwip_md4_context md4Context;
|
---|
574 |
|
---|
575 | lwip_md4_init(&md4Context);
|
---|
576 | lwip_md4_starts(&md4Context);
|
---|
577 | lwip_md4_update(&md4Context, secret, secret_len);
|
---|
578 | lwip_md4_finish(&md4Context, hash);
|
---|
579 | lwip_md4_free(&md4Context);
|
---|
580 | }
|
---|
581 |
|
---|
582 | static void ChapMS_NT(const u_char *rchallenge, const char *secret, int secret_len,
|
---|
583 | u_char NTResponse[24]) {
|
---|
584 | u_char unicodePassword[MAX_NT_PASSWORD * 2];
|
---|
585 | u_char PasswordHash[MD4_SIGNATURE_SIZE];
|
---|
586 |
|
---|
587 | /* Hash the Unicode version of the secret (== password). */
|
---|
588 | ascii2unicode(secret, secret_len, unicodePassword);
|
---|
589 | NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
|
---|
590 |
|
---|
591 | ChallengeResponse(rchallenge, PasswordHash, NTResponse);
|
---|
592 | }
|
---|
593 |
|
---|
594 | static void ChapMS2_NT(const u_char *rchallenge, const u_char PeerChallenge[16], const char *username,
|
---|
595 | const char *secret, int secret_len, u_char NTResponse[24]) {
|
---|
596 | u_char unicodePassword[MAX_NT_PASSWORD * 2];
|
---|
597 | u_char PasswordHash[MD4_SIGNATURE_SIZE];
|
---|
598 | u_char Challenge[8];
|
---|
599 |
|
---|
600 | ChallengeHash(PeerChallenge, rchallenge, username, Challenge);
|
---|
601 |
|
---|
602 | /* Hash the Unicode version of the secret (== password). */
|
---|
603 | ascii2unicode(secret, secret_len, unicodePassword);
|
---|
604 | NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
|
---|
605 |
|
---|
606 | ChallengeResponse(Challenge, PasswordHash, NTResponse);
|
---|
607 | }
|
---|
608 |
|
---|
609 | #ifdef MSLANMAN
|
---|
610 | static u_char *StdText = (u_char *)"KGS!@#$%"; /* key from rasapi32.dll */
|
---|
611 |
|
---|
612 | static void ChapMS_LANMan(u_char *rchallenge, char *secret, int secret_len,
|
---|
613 | unsigned char *response) {
|
---|
614 | int i;
|
---|
615 | u_char UcasePassword[MAX_NT_PASSWORD]; /* max is actually 14 */
|
---|
616 | u_char PasswordHash[MD4_SIGNATURE_SIZE];
|
---|
617 | lwip_des_context des;
|
---|
618 | u_char des_key[8];
|
---|
619 |
|
---|
620 | /* LANMan password is case insensitive */
|
---|
621 | BZERO(UcasePassword, sizeof(UcasePassword));
|
---|
622 | for (i = 0; i < secret_len; i++)
|
---|
623 | UcasePassword[i] = (u_char)toupper(secret[i]);
|
---|
624 |
|
---|
625 | pppcrypt_56_to_64_bit_key(UcasePassword +0, des_key);
|
---|
626 | lwip_des_init(&des);
|
---|
627 | lwip_des_setkey_enc(&des, des_key);
|
---|
628 | lwip_des_crypt_ecb(&des, StdText, PasswordHash +0);
|
---|
629 | lwip_des_free(&des);
|
---|
630 |
|
---|
631 | pppcrypt_56_to_64_bit_key(UcasePassword +7, des_key);
|
---|
632 | lwip_des_init(&des);
|
---|
633 | lwip_des_setkey_enc(&des, des_key);
|
---|
634 | lwip_des_crypt_ecb(&des, StdText, PasswordHash +8);
|
---|
635 | lwip_des_free(&des);
|
---|
636 |
|
---|
637 | ChallengeResponse(rchallenge, PasswordHash, &response[MS_CHAP_LANMANRESP]);
|
---|
638 | }
|
---|
639 | #endif
|
---|
640 |
|
---|
641 |
|
---|
642 | static void GenerateAuthenticatorResponse(const u_char PasswordHashHash[MD4_SIGNATURE_SIZE],
|
---|
643 | u_char NTResponse[24], const u_char PeerChallenge[16],
|
---|
644 | const u_char *rchallenge, const char *username,
|
---|
645 | u_char authResponse[MS_AUTH_RESPONSE_LENGTH+1]) {
|
---|
646 | /*
|
---|
647 | * "Magic" constants used in response generation, from RFC 2759.
|
---|
648 | */
|
---|
649 | static const u_char Magic1[39] = /* "Magic server to client signing constant" */
|
---|
650 | { 0x4D, 0x61, 0x67, 0x69, 0x63, 0x20, 0x73, 0x65, 0x72, 0x76,
|
---|
651 | 0x65, 0x72, 0x20, 0x74, 0x6F, 0x20, 0x63, 0x6C, 0x69, 0x65,
|
---|
652 | 0x6E, 0x74, 0x20, 0x73, 0x69, 0x67, 0x6E, 0x69, 0x6E, 0x67,
|
---|
653 | 0x20, 0x63, 0x6F, 0x6E, 0x73, 0x74, 0x61, 0x6E, 0x74 };
|
---|
654 | static const u_char Magic2[41] = /* "Pad to make it do more than one iteration" */
|
---|
655 | { 0x50, 0x61, 0x64, 0x20, 0x74, 0x6F, 0x20, 0x6D, 0x61, 0x6B,
|
---|
656 | 0x65, 0x20, 0x69, 0x74, 0x20, 0x64, 0x6F, 0x20, 0x6D, 0x6F,
|
---|
657 | 0x72, 0x65, 0x20, 0x74, 0x68, 0x61, 0x6E, 0x20, 0x6F, 0x6E,
|
---|
658 | 0x65, 0x20, 0x69, 0x74, 0x65, 0x72, 0x61, 0x74, 0x69, 0x6F,
|
---|
659 | 0x6E };
|
---|
660 |
|
---|
661 | int i;
|
---|
662 | lwip_sha1_context sha1Context;
|
---|
663 | u_char Digest[SHA1_SIGNATURE_SIZE];
|
---|
664 | u_char Challenge[8];
|
---|
665 |
|
---|
666 | lwip_sha1_init(&sha1Context);
|
---|
667 | lwip_sha1_starts(&sha1Context);
|
---|
668 | lwip_sha1_update(&sha1Context, PasswordHashHash, MD4_SIGNATURE_SIZE);
|
---|
669 | lwip_sha1_update(&sha1Context, NTResponse, 24);
|
---|
670 | lwip_sha1_update(&sha1Context, Magic1, sizeof(Magic1));
|
---|
671 | lwip_sha1_finish(&sha1Context, Digest);
|
---|
672 | lwip_sha1_free(&sha1Context);
|
---|
673 |
|
---|
674 | ChallengeHash(PeerChallenge, rchallenge, username, Challenge);
|
---|
675 |
|
---|
676 | lwip_sha1_init(&sha1Context);
|
---|
677 | lwip_sha1_starts(&sha1Context);
|
---|
678 | lwip_sha1_update(&sha1Context, Digest, sizeof(Digest));
|
---|
679 | lwip_sha1_update(&sha1Context, Challenge, sizeof(Challenge));
|
---|
680 | lwip_sha1_update(&sha1Context, Magic2, sizeof(Magic2));
|
---|
681 | lwip_sha1_finish(&sha1Context, Digest);
|
---|
682 | lwip_sha1_free(&sha1Context);
|
---|
683 |
|
---|
684 | /* Convert to ASCII hex string. */
|
---|
685 | for (i = 0; i < LWIP_MAX((MS_AUTH_RESPONSE_LENGTH / 2), (int)sizeof(Digest)); i++)
|
---|
686 | sprintf((char *)&authResponse[i * 2], "%02X", Digest[i]);
|
---|
687 | }
|
---|
688 |
|
---|
689 |
|
---|
690 | static void GenerateAuthenticatorResponsePlain(
|
---|
691 | const char *secret, int secret_len,
|
---|
692 | u_char NTResponse[24], const u_char PeerChallenge[16],
|
---|
693 | const u_char *rchallenge, const char *username,
|
---|
694 | u_char authResponse[MS_AUTH_RESPONSE_LENGTH+1]) {
|
---|
695 | u_char unicodePassword[MAX_NT_PASSWORD * 2];
|
---|
696 | u_char PasswordHash[MD4_SIGNATURE_SIZE];
|
---|
697 | u_char PasswordHashHash[MD4_SIGNATURE_SIZE];
|
---|
698 |
|
---|
699 | /* Hash (x2) the Unicode version of the secret (== password). */
|
---|
700 | ascii2unicode(secret, secret_len, unicodePassword);
|
---|
701 | NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
|
---|
702 | NTPasswordHash(PasswordHash, sizeof(PasswordHash),
|
---|
703 | PasswordHashHash);
|
---|
704 |
|
---|
705 | GenerateAuthenticatorResponse(PasswordHashHash, NTResponse, PeerChallenge,
|
---|
706 | rchallenge, username, authResponse);
|
---|
707 | }
|
---|
708 |
|
---|
709 |
|
---|
710 | #if MPPE_SUPPORT
|
---|
711 | /*
|
---|
712 | * Set mppe_xxxx_key from MS-CHAP credentials. (see RFC 3079)
|
---|
713 | */
|
---|
714 | static void Set_Start_Key(ppp_pcb *pcb, const u_char *rchallenge, const char *secret, int secret_len) {
|
---|
715 | u_char unicodePassword[MAX_NT_PASSWORD * 2];
|
---|
716 | u_char PasswordHash[MD4_SIGNATURE_SIZE];
|
---|
717 | u_char PasswordHashHash[MD4_SIGNATURE_SIZE];
|
---|
718 | lwip_sha1_context sha1Context;
|
---|
719 | u_char Digest[SHA1_SIGNATURE_SIZE]; /* >= MPPE_MAX_KEY_LEN */
|
---|
720 |
|
---|
721 | /* Hash (x2) the Unicode version of the secret (== password). */
|
---|
722 | ascii2unicode(secret, secret_len, unicodePassword);
|
---|
723 | NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
|
---|
724 | NTPasswordHash(PasswordHash, sizeof(PasswordHash), PasswordHashHash);
|
---|
725 |
|
---|
726 | lwip_sha1_init(&sha1Context);
|
---|
727 | lwip_sha1_starts(&sha1Context);
|
---|
728 | lwip_sha1_update(&sha1Context, PasswordHashHash, MD4_SIGNATURE_SIZE);
|
---|
729 | lwip_sha1_update(&sha1Context, PasswordHashHash, MD4_SIGNATURE_SIZE);
|
---|
730 | lwip_sha1_update(&sha1Context, rchallenge, 8);
|
---|
731 | lwip_sha1_finish(&sha1Context, Digest);
|
---|
732 | lwip_sha1_free(&sha1Context);
|
---|
733 |
|
---|
734 | /* Same key in both directions. */
|
---|
735 | mppe_set_key(pcb, &pcb->mppe_comp, Digest);
|
---|
736 | mppe_set_key(pcb, &pcb->mppe_decomp, Digest);
|
---|
737 |
|
---|
738 | pcb->mppe_keys_set = 1;
|
---|
739 | }
|
---|
740 |
|
---|
741 | /*
|
---|
742 | * Set mppe_xxxx_key from MS-CHAPv2 credentials. (see RFC 3079)
|
---|
743 | */
|
---|
744 | static void SetMasterKeys(ppp_pcb *pcb, const char *secret, int secret_len, u_char NTResponse[24], int IsServer) {
|
---|
745 | u_char unicodePassword[MAX_NT_PASSWORD * 2];
|
---|
746 | u_char PasswordHash[MD4_SIGNATURE_SIZE];
|
---|
747 | u_char PasswordHashHash[MD4_SIGNATURE_SIZE];
|
---|
748 | lwip_sha1_context sha1Context;
|
---|
749 | u_char MasterKey[SHA1_SIGNATURE_SIZE]; /* >= MPPE_MAX_KEY_LEN */
|
---|
750 | u_char Digest[SHA1_SIGNATURE_SIZE]; /* >= MPPE_MAX_KEY_LEN */
|
---|
751 | const u_char *s;
|
---|
752 |
|
---|
753 | /* "This is the MPPE Master Key" */
|
---|
754 | static const u_char Magic1[27] =
|
---|
755 | { 0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x74,
|
---|
756 | 0x68, 0x65, 0x20, 0x4d, 0x50, 0x50, 0x45, 0x20, 0x4d,
|
---|
757 | 0x61, 0x73, 0x74, 0x65, 0x72, 0x20, 0x4b, 0x65, 0x79 };
|
---|
758 | /* "On the client side, this is the send key; "
|
---|
759 | "on the server side, it is the receive key." */
|
---|
760 | static const u_char Magic2[84] =
|
---|
761 | { 0x4f, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x63, 0x6c, 0x69,
|
---|
762 | 0x65, 0x6e, 0x74, 0x20, 0x73, 0x69, 0x64, 0x65, 0x2c, 0x20,
|
---|
763 | 0x74, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x74, 0x68,
|
---|
764 | 0x65, 0x20, 0x73, 0x65, 0x6e, 0x64, 0x20, 0x6b, 0x65, 0x79,
|
---|
765 | 0x3b, 0x20, 0x6f, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x73,
|
---|
766 | 0x65, 0x72, 0x76, 0x65, 0x72, 0x20, 0x73, 0x69, 0x64, 0x65,
|
---|
767 | 0x2c, 0x20, 0x69, 0x74, 0x20, 0x69, 0x73, 0x20, 0x74, 0x68,
|
---|
768 | 0x65, 0x20, 0x72, 0x65, 0x63, 0x65, 0x69, 0x76, 0x65, 0x20,
|
---|
769 | 0x6b, 0x65, 0x79, 0x2e };
|
---|
770 | /* "On the client side, this is the receive key; "
|
---|
771 | "on the server side, it is the send key." */
|
---|
772 | static const u_char Magic3[84] =
|
---|
773 | { 0x4f, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x63, 0x6c, 0x69,
|
---|
774 | 0x65, 0x6e, 0x74, 0x20, 0x73, 0x69, 0x64, 0x65, 0x2c, 0x20,
|
---|
775 | 0x74, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x74, 0x68,
|
---|
776 | 0x65, 0x20, 0x72, 0x65, 0x63, 0x65, 0x69, 0x76, 0x65, 0x20,
|
---|
777 | 0x6b, 0x65, 0x79, 0x3b, 0x20, 0x6f, 0x6e, 0x20, 0x74, 0x68,
|
---|
778 | 0x65, 0x20, 0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x20, 0x73,
|
---|
779 | 0x69, 0x64, 0x65, 0x2c, 0x20, 0x69, 0x74, 0x20, 0x69, 0x73,
|
---|
780 | 0x20, 0x74, 0x68, 0x65, 0x20, 0x73, 0x65, 0x6e, 0x64, 0x20,
|
---|
781 | 0x6b, 0x65, 0x79, 0x2e };
|
---|
782 |
|
---|
783 | /* Hash (x2) the Unicode version of the secret (== password). */
|
---|
784 | ascii2unicode(secret, secret_len, unicodePassword);
|
---|
785 | NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
|
---|
786 | NTPasswordHash(PasswordHash, sizeof(PasswordHash), PasswordHashHash);
|
---|
787 |
|
---|
788 | lwip_sha1_init(&sha1Context);
|
---|
789 | lwip_sha1_starts(&sha1Context);
|
---|
790 | lwip_sha1_update(&sha1Context, PasswordHashHash, MD4_SIGNATURE_SIZE);
|
---|
791 | lwip_sha1_update(&sha1Context, NTResponse, 24);
|
---|
792 | lwip_sha1_update(&sha1Context, Magic1, sizeof(Magic1));
|
---|
793 | lwip_sha1_finish(&sha1Context, MasterKey);
|
---|
794 | lwip_sha1_free(&sha1Context);
|
---|
795 |
|
---|
796 | /*
|
---|
797 | * generate send key
|
---|
798 | */
|
---|
799 | if (IsServer)
|
---|
800 | s = Magic3;
|
---|
801 | else
|
---|
802 | s = Magic2;
|
---|
803 | lwip_sha1_init(&sha1Context);
|
---|
804 | lwip_sha1_starts(&sha1Context);
|
---|
805 | lwip_sha1_update(&sha1Context, MasterKey, 16);
|
---|
806 | lwip_sha1_update(&sha1Context, mppe_sha1_pad1, SHA1_PAD_SIZE);
|
---|
807 | lwip_sha1_update(&sha1Context, s, 84);
|
---|
808 | lwip_sha1_update(&sha1Context, mppe_sha1_pad2, SHA1_PAD_SIZE);
|
---|
809 | lwip_sha1_finish(&sha1Context, Digest);
|
---|
810 | lwip_sha1_free(&sha1Context);
|
---|
811 |
|
---|
812 | mppe_set_key(pcb, &pcb->mppe_comp, Digest);
|
---|
813 |
|
---|
814 | /*
|
---|
815 | * generate recv key
|
---|
816 | */
|
---|
817 | if (IsServer)
|
---|
818 | s = Magic2;
|
---|
819 | else
|
---|
820 | s = Magic3;
|
---|
821 | lwip_sha1_init(&sha1Context);
|
---|
822 | lwip_sha1_starts(&sha1Context);
|
---|
823 | lwip_sha1_update(&sha1Context, MasterKey, 16);
|
---|
824 | lwip_sha1_update(&sha1Context, mppe_sha1_pad1, SHA1_PAD_SIZE);
|
---|
825 | lwip_sha1_update(&sha1Context, s, 84);
|
---|
826 | lwip_sha1_update(&sha1Context, mppe_sha1_pad2, SHA1_PAD_SIZE);
|
---|
827 | lwip_sha1_finish(&sha1Context, Digest);
|
---|
828 | lwip_sha1_free(&sha1Context);
|
---|
829 |
|
---|
830 | mppe_set_key(pcb, &pcb->mppe_decomp, Digest);
|
---|
831 |
|
---|
832 | pcb->mppe_keys_set = 1;
|
---|
833 | }
|
---|
834 |
|
---|
835 | #endif /* MPPE_SUPPORT */
|
---|
836 |
|
---|
837 |
|
---|
838 | static void ChapMS(ppp_pcb *pcb, const u_char *rchallenge, const char *secret, int secret_len,
|
---|
839 | unsigned char *response) {
|
---|
840 | #if !MPPE_SUPPORT
|
---|
841 | LWIP_UNUSED_ARG(pcb);
|
---|
842 | #endif /* !MPPE_SUPPORT */
|
---|
843 | BZERO(response, MS_CHAP_RESPONSE_LEN);
|
---|
844 |
|
---|
845 | ChapMS_NT(rchallenge, secret, secret_len, &response[MS_CHAP_NTRESP]);
|
---|
846 |
|
---|
847 | #ifdef MSLANMAN
|
---|
848 | ChapMS_LANMan(rchallenge, secret, secret_len,
|
---|
849 | &response[MS_CHAP_LANMANRESP]);
|
---|
850 |
|
---|
851 | /* preferred method is set by option */
|
---|
852 | response[MS_CHAP_USENT] = !ms_lanman;
|
---|
853 | #else
|
---|
854 | response[MS_CHAP_USENT] = 1;
|
---|
855 | #endif
|
---|
856 |
|
---|
857 | #if MPPE_SUPPORT
|
---|
858 | Set_Start_Key(pcb, rchallenge, secret, secret_len);
|
---|
859 | #endif /* MPPE_SUPPORT */
|
---|
860 | }
|
---|
861 |
|
---|
862 |
|
---|
863 | /*
|
---|
864 | * If PeerChallenge is NULL, one is generated and the PeerChallenge
|
---|
865 | * field of response is filled in. Call this way when generating a response.
|
---|
866 | * If PeerChallenge is supplied, it is copied into the PeerChallenge field.
|
---|
867 | * Call this way when verifying a response (or debugging).
|
---|
868 | * Do not call with PeerChallenge = response.
|
---|
869 | *
|
---|
870 | * The PeerChallenge field of response is then used for calculation of the
|
---|
871 | * Authenticator Response.
|
---|
872 | */
|
---|
873 | static void ChapMS2(ppp_pcb *pcb, const u_char *rchallenge, const u_char *PeerChallenge,
|
---|
874 | const char *user, const char *secret, int secret_len, unsigned char *response,
|
---|
875 | u_char authResponse[], int authenticator) {
|
---|
876 | /* ARGSUSED */
|
---|
877 | LWIP_UNUSED_ARG(authenticator);
|
---|
878 | #if !MPPE_SUPPORT
|
---|
879 | LWIP_UNUSED_ARG(pcb);
|
---|
880 | #endif /* !MPPE_SUPPORT */
|
---|
881 |
|
---|
882 | BZERO(response, MS_CHAP2_RESPONSE_LEN);
|
---|
883 |
|
---|
884 | /* Generate the Peer-Challenge if requested, or copy it if supplied. */
|
---|
885 | if (!PeerChallenge)
|
---|
886 | magic_random_bytes(&response[MS_CHAP2_PEER_CHALLENGE], MS_CHAP2_PEER_CHAL_LEN);
|
---|
887 | else
|
---|
888 | MEMCPY(&response[MS_CHAP2_PEER_CHALLENGE], PeerChallenge,
|
---|
889 | MS_CHAP2_PEER_CHAL_LEN);
|
---|
890 |
|
---|
891 | /* Generate the NT-Response */
|
---|
892 | ChapMS2_NT(rchallenge, &response[MS_CHAP2_PEER_CHALLENGE], user,
|
---|
893 | secret, secret_len, &response[MS_CHAP2_NTRESP]);
|
---|
894 |
|
---|
895 | /* Generate the Authenticator Response. */
|
---|
896 | GenerateAuthenticatorResponsePlain(secret, secret_len,
|
---|
897 | &response[MS_CHAP2_NTRESP],
|
---|
898 | &response[MS_CHAP2_PEER_CHALLENGE],
|
---|
899 | rchallenge, user, authResponse);
|
---|
900 |
|
---|
901 | #if MPPE_SUPPORT
|
---|
902 | SetMasterKeys(pcb, secret, secret_len,
|
---|
903 | &response[MS_CHAP2_NTRESP], authenticator);
|
---|
904 | #endif /* MPPE_SUPPORT */
|
---|
905 | }
|
---|
906 |
|
---|
907 | #if 0 /* UNUSED */
|
---|
908 | #if MPPE_SUPPORT
|
---|
909 | /*
|
---|
910 | * Set MPPE options from plugins.
|
---|
911 | */
|
---|
912 | void set_mppe_enc_types(int policy, int types) {
|
---|
913 | /* Early exit for unknown policies. */
|
---|
914 | if (policy != MPPE_ENC_POL_ENC_ALLOWED ||
|
---|
915 | policy != MPPE_ENC_POL_ENC_REQUIRED)
|
---|
916 | return;
|
---|
917 |
|
---|
918 | /* Don't modify MPPE if it's optional and wasn't already configured. */
|
---|
919 | if (policy == MPPE_ENC_POL_ENC_ALLOWED && !ccp_wantoptions[0].mppe)
|
---|
920 | return;
|
---|
921 |
|
---|
922 | /*
|
---|
923 | * Disable undesirable encryption types. Note that we don't ENABLE
|
---|
924 | * any encryption types, to avoid overriding manual configuration.
|
---|
925 | */
|
---|
926 | switch(types) {
|
---|
927 | case MPPE_ENC_TYPES_RC4_40:
|
---|
928 | ccp_wantoptions[0].mppe &= ~MPPE_OPT_128; /* disable 128-bit */
|
---|
929 | break;
|
---|
930 | case MPPE_ENC_TYPES_RC4_128:
|
---|
931 | ccp_wantoptions[0].mppe &= ~MPPE_OPT_40; /* disable 40-bit */
|
---|
932 | break;
|
---|
933 | default:
|
---|
934 | break;
|
---|
935 | }
|
---|
936 | }
|
---|
937 | #endif /* MPPE_SUPPORT */
|
---|
938 | #endif /* UNUSED */
|
---|
939 |
|
---|
940 | const struct chap_digest_type chapms_digest = {
|
---|
941 | CHAP_MICROSOFT, /* code */
|
---|
942 | #if PPP_SERVER
|
---|
943 | chapms_generate_challenge,
|
---|
944 | chapms_verify_response,
|
---|
945 | #endif /* PPP_SERVER */
|
---|
946 | chapms_make_response,
|
---|
947 | NULL, /* check_success */
|
---|
948 | chapms_handle_failure,
|
---|
949 | };
|
---|
950 |
|
---|
951 | const struct chap_digest_type chapms2_digest = {
|
---|
952 | CHAP_MICROSOFT_V2, /* code */
|
---|
953 | #if PPP_SERVER
|
---|
954 | chapms2_generate_challenge,
|
---|
955 | chapms2_verify_response,
|
---|
956 | #endif /* PPP_SERVER */
|
---|
957 | chapms2_make_response,
|
---|
958 | chapms2_check_success,
|
---|
959 | chapms_handle_failure,
|
---|
960 | };
|
---|
961 |
|
---|
962 | #endif /* PPP_SUPPORT && MSCHAP_SUPPORT */
|
---|