prosody
c186b4883b8d
util/sasl/digest-md5.lua

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util/sasl/digest-md5.lua @ 2936:c186b4883b8d

util.sasl.digest-md5: Removed unnnecessary check (which included a nil global access).
author Waqas Hussain <waqas20@gmail.com>
date Wed, 24 Mar 2010 00:07:17 +0500
parent 2569:8474ea768c89
child 2998:36c169ed1576
child 3092:d32935878661
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) 2008-2009 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 local function digest(self, message)
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33 --TODO complete support for authzid
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34
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35 local function serialize(message)
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36 local data = ""
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37
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38 -- testing all possible values
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39 if message["realm"] then data = data..[[realm="]]..message.realm..[[",]] end
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40 if message["nonce"] then data = data..[[nonce="]]..message.nonce..[[",]] end
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41 if message["qop"] then data = data..[[qop="]]..message.qop..[[",]] end
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42 if message["charset"] then data = data..[[charset=]]..message.charset.."," end
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43 if message["algorithm"] then data = data..[[algorithm=]]..message.algorithm.."," end
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44 if message["rspauth"] then data = data..[[rspauth=]]..message.rspauth.."," end
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45 data = data:gsub(",$", "")
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46 return data
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47 end
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48
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49 local function utf8tolatin1ifpossible(passwd)
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50 local i = 1;
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51 while i <= #passwd do
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52 local passwd_i = to_byte(passwd:sub(i, i));
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53 if passwd_i > 0x7F then
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54 if passwd_i < 0xC0 or passwd_i > 0xC3 then
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55 return passwd;
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56 end
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57 i = i + 1;
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58 passwd_i = to_byte(passwd:sub(i, i));
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59 if passwd_i < 0x80 or passwd_i > 0xBF then
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60 return passwd;
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61 end
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62 end
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63 i = i + 1;
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64 end
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65
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66 local p = {};
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67 local j = 0;
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68 i = 1;
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69 while (i <= #passwd) do
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70 local passwd_i = to_byte(passwd:sub(i, i));
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71 if passwd_i > 0x7F then
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72 i = i + 1;
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73 local passwd_i_1 = to_byte(passwd:sub(i, i));
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74 t_insert(p, to_char(passwd_i%4*64 + passwd_i_1%64)); -- I'm so clever
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75 else
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76 t_insert(p, to_char(passwd_i));
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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 return t_concat(p);
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81 end
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82 local function latin1toutf8(str)
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83 local p = {};
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84 for ch in s_gmatch(str, ".") do
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85 ch = to_byte(ch);
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86 if (ch < 0x80) then
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87 t_insert(p, to_char(ch));
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88 elseif (ch < 0xC0) then
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89 t_insert(p, to_char(0xC2, ch));
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90 else
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91 t_insert(p, to_char(0xC3, ch - 64));
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92 end
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93 end
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94 return t_concat(p);
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95 end
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96 local function parse(data)
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97 local message = {}
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98 -- COMPAT: %z in the pattern to work around jwchat bug (sends "charset=utf-8\0")
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99 for k, v in s_gmatch(data, [[([%w%-]+)="?([^",%z]*)"?,?]]) do -- FIXME The hacky regex makes me shudder
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100 message[k] = v;
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101 end
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102 return message;
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103 end
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104
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105 if not self.nonce then
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106 self.nonce = generate_uuid();
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107 self.step = 0;
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108 self.nonce_count = {};
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109 end
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110
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111 self.step = self.step + 1;
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112 if (self.step == 1) then
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113 local challenge = serialize({ nonce = self.nonce,
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114 qop = "auth",
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115 charset = "utf-8",
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116 algorithm = "md5-sess",
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117 realm = self.realm});
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118 return "challenge", challenge;
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119 elseif (self.step == 2) then
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120 local response = parse(message);
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121 -- check for replay attack
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122 if response["nc"] then
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123 if self.nonce_count[response["nc"]] then return "failure", "not-authorized" end
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124 end
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125
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126 -- check for username, it's REQUIRED by RFC 2831
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127 if not response["username"] then
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128 return "failure", "malformed-request";
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129 end
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130 self["username"] = response["username"];
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131
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132 -- check for nonce, ...
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133 if not response["nonce"] then
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134 return "failure", "malformed-request";
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135 else
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136 -- check if it's the right nonce
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137 if response["nonce"] ~= tostring(self.nonce) then return "failure", "malformed-request" end
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138 end
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139
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140 if not response["cnonce"] then return "failure", "malformed-request", "Missing entry for cnonce in SASL message." end
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141 if not response["qop"] then response["qop"] = "auth" end
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142
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143 if response["realm"] == nil or response["realm"] == "" then
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144 response["realm"] = "";
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145 elseif response["realm"] ~= self.realm then
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146 return "failure", "not-authorized", "Incorrect realm value";
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147 end
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148
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149 local decoder;
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150 if response["charset"] == nil then
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151 decoder = utf8tolatin1ifpossible;
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152 elseif response["charset"] ~= "utf-8" then
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153 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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154 end
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155
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156 local domain = "";
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157 local protocol = "";
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158 if response["digest-uri"] then
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159 protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$");
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160 if protocol == nil or domain == nil then return "failure", "malformed-request" end
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161 else
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162 return "failure", "malformed-request", "Missing entry for digest-uri in SASL message."
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163 end
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164
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165 --TODO maybe realm support
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166 self.username = response["username"];
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167 local Y, state;
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168 if self.profile.plain then
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169 local password, state = self.profile.plain(response["username"], self.realm)
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170 if state == nil then return "failure", "not-authorized"
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171 elseif state == false then return "failure", "account-disabled" end
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172 Y = md5(response["username"]..":"..response["realm"]..":"..password);
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173 elseif self.profile["digest-md5"] then
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174 Y, state = self.profile["digest-md5"](response["username"], self.realm, response["realm"], response["charset"])
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175 if state == nil then return "failure", "not-authorized"
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176 elseif state == false then return "failure", "account-disabled" end
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177 elseif self.profile["digest-md5-test"] then
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178 -- TODO
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179 end
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180 --local password_encoding, Y = self.credentials_handler("DIGEST-MD5", response["username"], self.realm, response["realm"], decoder);
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181 --if Y == nil then return "failure", "not-authorized"
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182 --elseif Y == false then return "failure", "account-disabled" end
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183 local A1 = "";
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184 if response.authzid then
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185 if response.authzid == self.username or response.authzid == self.username.."@"..self.realm then
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186 -- COMPAT
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187 log("warn", "Client is violating RFC 3920 (section 6.1, point 7).");
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188 A1 = Y..":"..response["nonce"]..":"..response["cnonce"]..":"..response.authzid;
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189 else
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190 return "failure", "invalid-authzid";
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191 end
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192 else
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193 A1 = Y..":"..response["nonce"]..":"..response["cnonce"];
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194 end
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195 local A2 = "AUTHENTICATE:"..protocol.."/"..domain;
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196
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197 local HA1 = md5(A1, true);
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198 local HA2 = md5(A2, true);
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199
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200 local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2;
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201 local response_value = md5(KD, true);
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202
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203 if response_value == response["response"] then
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204 -- calculate rspauth
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205 A2 = ":"..protocol.."/"..domain;
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206
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207 HA1 = md5(A1, true);
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208 HA2 = md5(A2, true);
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209
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210 KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
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211 local rspauth = md5(KD, true);
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212 self.authenticated = true;
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213 --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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214 return "challenge", serialize({rspauth = rspauth});
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215 else
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216 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated."
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217 end
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218 elseif self.step == 3 then
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219 if self.authenticated ~= nil then return "success"
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220 else return "failure", "malformed-request" end
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221 end
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222 end
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223
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224 function init(registerMechanism)
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225 registerMechanism("DIGEST-MD5", {"plain"}, digest);
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226 end
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227
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228 return _M;