prosody
36c169ed1576
util/sasl/digest-md5.lua

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util/sasl/digest-md5.lua @ 2998:36c169ed1576

Merge Tobias's fancy SASL branch->trunk
author Matthew Wild <mwild1@gmail.com>
date Wed, 05 May 2010 11:29:10 +0100
parent 2936:c186b4883b8d
parent 2996:b0515ed4d9d7
child 3116:90a98a6b52ac
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- sasl.lua v0.4
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2 -- Copyright (C) 2008-2010 Tobias Markmann
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3 --
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4 -- All rights reserved.
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5 --
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6 -- Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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7 --
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8 -- * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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9 -- * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
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10 -- * Neither the name of Tobias Markmann nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
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11 --
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12 -- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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13
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14 local tostring = tostring;
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15 local type = type;
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16
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17 local s_gmatch = string.gmatch;
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18 local s_match = string.match;
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19 local t_concat = table.concat;
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20 local t_insert = table.insert;
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21 local to_byte, to_char = string.byte, string.char;
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22
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23 local md5 = require "util.hashes".md5;
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24 local log = require "util.logger".init("sasl");
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25 local generate_uuid = require "util.uuid".generate;
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26
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27 module "digest-md5"
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28
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29 --=========================
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30 --SASL DIGEST-MD5 according to RFC 2831
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31
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32 --[[
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33 Supported Authentication Backends
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34
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35 digest-md5:
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36 function(username, domain, realm, encoding) -- domain and realm are usually the same; for some broken
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37 -- implementations it's not
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38 return digesthash, state;
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39 end
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40
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41 digest-md5-test:
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42 function(username, domain, realm, encoding, digesthash)
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43 return true or false, state;
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44 end
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45 ]]
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46
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47 local function digest(self, message)
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48 --TODO complete support for authzid
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49
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50 local function serialize(message)
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51 local data = ""
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52
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53 -- testing all possible values
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54 if message["realm"] then data = data..[[realm="]]..message.realm..[[",]] end
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55 if message["nonce"] then data = data..[[nonce="]]..message.nonce..[[",]] end
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56 if message["qop"] then data = data..[[qop="]]..message.qop..[[",]] end
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57 if message["charset"] then data = data..[[charset=]]..message.charset.."," end
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58 if message["algorithm"] then data = data..[[algorithm=]]..message.algorithm.."," end
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59 if message["rspauth"] then data = data..[[rspauth=]]..message.rspauth.."," end
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60 data = data:gsub(",$", "")
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61 return data
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62 end
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63
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64 local function utf8tolatin1ifpossible(passwd)
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65 local i = 1;
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66 while i <= #passwd do
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67 local passwd_i = to_byte(passwd:sub(i, i));
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68 if passwd_i > 0x7F then
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69 if passwd_i < 0xC0 or passwd_i > 0xC3 then
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70 return passwd;
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71 end
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72 i = i + 1;
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73 passwd_i = to_byte(passwd:sub(i, i));
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74 if passwd_i < 0x80 or passwd_i > 0xBF then
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75 return passwd;
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76 end
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77 end
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78 i = i + 1;
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79 end
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80
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81 local p = {};
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82 local j = 0;
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83 i = 1;
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84 while (i <= #passwd) do
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85 local passwd_i = to_byte(passwd:sub(i, i));
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86 if passwd_i > 0x7F then
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87 i = i + 1;
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88 local passwd_i_1 = to_byte(passwd:sub(i, i));
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89 t_insert(p, to_char(passwd_i%4*64 + passwd_i_1%64)); -- I'm so clever
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90 else
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91 t_insert(p, to_char(passwd_i));
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92 end
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93 i = i + 1;
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94 end
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95 return t_concat(p);
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96 end
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97 local function latin1toutf8(str)
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98 local p = {};
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99 for ch in s_gmatch(str, ".") do
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100 ch = to_byte(ch);
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101 if (ch < 0x80) then
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102 t_insert(p, to_char(ch));
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103 elseif (ch < 0xC0) then
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104 t_insert(p, to_char(0xC2, ch));
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105 else
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106 t_insert(p, to_char(0xC3, ch - 64));
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107 end
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108 end
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109 return t_concat(p);
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110 end
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111 local function parse(data)
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112 local message = {}
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113 -- COMPAT: %z in the pattern to work around jwchat bug (sends "charset=utf-8\0")
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114 for k, v in s_gmatch(data, [[([%w%-]+)="?([^",%z]*)"?,?]]) do -- FIXME The hacky regex makes me shudder
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115 message[k] = v;
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116 end
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117 return message;
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118 end
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119
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120 if not self.nonce then
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121 self.nonce = generate_uuid();
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122 self.step = 0;
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123 self.nonce_count = {};
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124 end
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125
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126 self.step = self.step + 1;
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127 if (self.step == 1) then
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128 local challenge = serialize({ nonce = self.nonce,
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129 qop = "auth",
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130 charset = "utf-8",
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131 algorithm = "md5-sess",
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132 realm = self.realm});
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133 return "challenge", challenge;
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134 elseif (self.step == 2) then
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135 local response = parse(message);
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136 -- check for replay attack
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137 if response["nc"] then
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138 if self.nonce_count[response["nc"]] then return "failure", "not-authorized" end
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139 end
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140
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141 -- check for username, it's REQUIRED by RFC 2831
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142 if not response["username"] then
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143 return "failure", "malformed-request";
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144 end
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145 self["username"] = response["username"];
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146
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147 -- check for nonce, ...
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148 if not response["nonce"] then
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149 return "failure", "malformed-request";
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150 else
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151 -- check if it's the right nonce
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152 if response["nonce"] ~= tostring(self.nonce) then return "failure", "malformed-request" end
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153 end
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154
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155 if not response["cnonce"] then return "failure", "malformed-request", "Missing entry for cnonce in SASL message." end
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156 if not response["qop"] then response["qop"] = "auth" end
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157
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158 if response["realm"] == nil or response["realm"] == "" then
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159 response["realm"] = "";
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160 elseif response["realm"] ~= self.realm then
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161 return "failure", "not-authorized", "Incorrect realm value";
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162 end
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163
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164 local decoder;
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165 if response["charset"] == nil then
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166 decoder = utf8tolatin1ifpossible;
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167 elseif response["charset"] ~= "utf-8" then
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168 return "failure", "incorrect-encoding", "The client's response uses "..response["charset"].." for encoding with isn't supported by sasl.lua. Supported encodings are latin or utf-8.";
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169 end
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170
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171 local domain = "";
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172 local protocol = "";
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173 if response["digest-uri"] then
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174 protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$");
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175 if protocol == nil or domain == nil then return "failure", "malformed-request" end
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176 else
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177 return "failure", "malformed-request", "Missing entry for digest-uri in SASL message."
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178 end
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179
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180 --TODO maybe realm support
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181 self.username = response["username"];
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182 local Y, state;
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183 if self.profile.plain then
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184 local password, state = self.profile.plain(response["username"], self.realm)
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185 if state == nil then return "failure", "not-authorized"
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186 elseif state == false then return "failure", "account-disabled" end
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187 Y = md5(response["username"]..":"..response["realm"]..":"..password);
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188 elseif self.profile["digest-md5"] then
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189 Y, state = self.profile["digest-md5"](response["username"], self.realm, response["realm"], response["charset"])
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190 if state == nil then return "failure", "not-authorized"
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191 elseif state == false then return "failure", "account-disabled" end
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192 elseif self.profile["digest-md5-test"] then
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193 -- TODO
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194 end
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195 --local password_encoding, Y = self.credentials_handler("DIGEST-MD5", response["username"], self.realm, response["realm"], decoder);
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196 --if Y == nil then return "failure", "not-authorized"
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197 --elseif Y == false then return "failure", "account-disabled" end
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198 local A1 = "";
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199 if response.authzid then
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200 if response.authzid == self.username or response.authzid == self.username.."@"..self.realm then
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201 -- COMPAT
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202 log("warn", "Client is violating RFC 3920 (section 6.1, point 7).");
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203 A1 = Y..":"..response["nonce"]..":"..response["cnonce"]..":"..response.authzid;
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204 else
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205 return "failure", "invalid-authzid";
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206 end
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207 else
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208 A1 = Y..":"..response["nonce"]..":"..response["cnonce"];
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209 end
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210 local A2 = "AUTHENTICATE:"..protocol.."/"..domain;
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211
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212 local HA1 = md5(A1, true);
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213 local HA2 = md5(A2, true);
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214
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215 local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2;
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216 local response_value = md5(KD, true);
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217
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218 if response_value == response["response"] then
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219 -- calculate rspauth
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220 A2 = ":"..protocol.."/"..domain;
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221
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222 HA1 = md5(A1, true);
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223 HA2 = md5(A2, true);
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224
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225 KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
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226 local rspauth = md5(KD, true);
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227 self.authenticated = true;
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228 --TODO: considering sending the rspauth in a success node for saving one roundtrip; allowed according to http://tools.ietf.org/html/draft-saintandre-rfc3920bis-09#section-7.3.6
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229 return "challenge", serialize({rspauth = rspauth});
2186
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230 else
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231 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated."
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232 end
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233 elseif self.step == 3 then
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234 if self.authenticated ~= nil then return "success"
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235 else return "failure", "malformed-request" end
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236 end
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237 end
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238
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239 function init(registerMechanism)
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240 registerMechanism("DIGEST-MD5", {"plain"}, digest);
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241 end
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242
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243 return _M;