prosody
8474ea768c89
util/sasl/digest-md5.lua

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util/sasl/digest-md5.lua @ 2569:8474ea768c89

Merge with backout
author Matthew Wild <mwild1@gmail.com>
date Fri, 05 Feb 2010 17:46:58 +0000
parent 2258:e4c5d0d21ac7
parent 2568:25e1a544a096
child 2936:c186b4883b8d
child 2991:0fa3a7c885bd
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 if type(message) ~= "table" then error("serialize needs an argument of type table.") end
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39
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40 -- testing all possible values
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41 if message["realm"] then data = data..[[realm="]]..message.realm..[[",]] end
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42 if message["nonce"] then data = data..[[nonce="]]..message.nonce..[[",]] end
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43 if message["qop"] then data = data..[[qop="]]..message.qop..[[",]] end
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44 if message["charset"] then data = data..[[charset=]]..message.charset.."," end
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45 if message["algorithm"] then data = data..[[algorithm=]]..message.algorithm.."," end
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46 if message["rspauth"] then data = data..[[rspauth=]]..message.rspauth.."," end
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47 data = data:gsub(",$", "")
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48 return data
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49 end
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50
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51 local function utf8tolatin1ifpossible(passwd)
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52 local i = 1;
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53 while i <= #passwd do
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54 local passwd_i = to_byte(passwd:sub(i, i));
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55 if passwd_i > 0x7F then
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56 if passwd_i < 0xC0 or passwd_i > 0xC3 then
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57 return passwd;
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58 end
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59 i = i + 1;
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60 passwd_i = to_byte(passwd:sub(i, i));
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61 if passwd_i < 0x80 or passwd_i > 0xBF then
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62 return passwd;
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63 end
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64 end
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65 i = i + 1;
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66 end
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67
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68 local p = {};
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69 local j = 0;
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70 i = 1;
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71 while (i <= #passwd) do
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72 local passwd_i = to_byte(passwd:sub(i, i));
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73 if passwd_i > 0x7F then
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74 i = i + 1;
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75 local passwd_i_1 = to_byte(passwd:sub(i, i));
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76 t_insert(p, to_char(passwd_i%4*64 + passwd_i_1%64)); -- I'm so clever
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77 else
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78 t_insert(p, to_char(passwd_i));
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79 end
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80 i = i + 1;
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81 end
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82 return t_concat(p);
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83 end
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84 local function latin1toutf8(str)
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85 local p = {};
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86 for ch in s_gmatch(str, ".") do
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87 ch = to_byte(ch);
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88 if (ch < 0x80) then
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89 t_insert(p, to_char(ch));
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90 elseif (ch < 0xC0) then
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91 t_insert(p, to_char(0xC2, ch));
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92 else
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93 t_insert(p, to_char(0xC3, ch - 64));
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94 end
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95 end
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96 return t_concat(p);
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97 end
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98 local function parse(data)
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99 local message = {}
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100 -- COMPAT: %z in the pattern to work around jwchat bug (sends "charset=utf-8\0")
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101 for k, v in s_gmatch(data, [[([%w%-]+)="?([^",%z]*)"?,?]]) do -- FIXME The hacky regex makes me shudder
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102 message[k] = v;
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103 end
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104 return message;
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105 end
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106
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107 if not self.nonce then
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108 self.nonce = generate_uuid();
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109 self.step = 0;
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110 self.nonce_count = {};
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111 end
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112
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113 self.step = self.step + 1;
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114 if (self.step == 1) then
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115 local challenge = serialize({ nonce = self.nonce,
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116 qop = "auth",
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117 charset = "utf-8",
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118 algorithm = "md5-sess",
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119 realm = self.realm});
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120 return "challenge", challenge;
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121 elseif (self.step == 2) then
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122 local response = parse(message);
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123 -- check for replay attack
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124 if response["nc"] then
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125 if self.nonce_count[response["nc"]] then return "failure", "not-authorized" end
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126 end
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127
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128 -- check for username, it's REQUIRED by RFC 2831
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129 if not response["username"] then
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130 return "failure", "malformed-request";
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131 end
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132 self["username"] = response["username"];
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133
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134 -- check for nonce, ...
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135 if not response["nonce"] then
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136 return "failure", "malformed-request";
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137 else
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138 -- check if it's the right nonce
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139 if response["nonce"] ~= tostring(self.nonce) then return "failure", "malformed-request" end
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140 end
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141
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142 if not response["cnonce"] then return "failure", "malformed-request", "Missing entry for cnonce in SASL message." end
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143 if not response["qop"] then response["qop"] = "auth" end
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144
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145 if response["realm"] == nil or response["realm"] == "" then
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146 response["realm"] = "";
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147 elseif response["realm"] ~= self.realm then
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148 return "failure", "not-authorized", "Incorrect realm value";
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149 end
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150
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151 local decoder;
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152 if response["charset"] == nil then
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153 decoder = utf8tolatin1ifpossible;
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154 elseif response["charset"] ~= "utf-8" then
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155 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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156 end
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157
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158 local domain = "";
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159 local protocol = "";
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160 if response["digest-uri"] then
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161 protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$");
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162 if protocol == nil or domain == nil then return "failure", "malformed-request" end
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163 else
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164 return "failure", "malformed-request", "Missing entry for digest-uri in SASL message."
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165 end
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166
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167 --TODO maybe realm support
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168 self.username = response["username"];
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169 local Y, state;
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170 if self.profile.plain then
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171 local password, state = self.profile.plain(response["username"], self.realm)
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172 if state == nil then return "failure", "not-authorized"
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173 elseif state == false then return "failure", "account-disabled" end
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174 Y = md5(response["username"]..":"..response["realm"]..":"..password);
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175 elseif self.profile["digest-md5"] then
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176 Y, state = self.profile["digest-md5"](response["username"], self.realm, response["realm"], response["charset"])
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177 if state == nil then return "failure", "not-authorized"
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178 elseif state == false then return "failure", "account-disabled" end
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179 elseif self.profile["digest-md5-test"] then
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180 -- TODO
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181 end
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182 --local password_encoding, Y = self.credentials_handler("DIGEST-MD5", response["username"], self.realm, response["realm"], decoder);
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183 --if Y == nil then return "failure", "not-authorized"
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184 --elseif Y == false then return "failure", "account-disabled" end
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185 local A1 = "";
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186 if response.authzid then
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187 if response.authzid == self.username or response.authzid == self.username.."@"..self.realm then
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188 -- COMPAT
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189 log("warn", "Client is violating RFC 3920 (section 6.1, point 7).");
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190 A1 = Y..":"..response["nonce"]..":"..response["cnonce"]..":"..response.authzid;
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191 else
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192 return "failure", "invalid-authzid";
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193 end
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194 else
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195 A1 = Y..":"..response["nonce"]..":"..response["cnonce"];
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196 end
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197 local A2 = "AUTHENTICATE:"..protocol.."/"..domain;
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198
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199 local HA1 = md5(A1, true);
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200 local HA2 = md5(A2, true);
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201
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202 local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2;
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203 local response_value = md5(KD, true);
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204
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205 if response_value == response["response"] then
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206 -- calculate rspauth
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207 A2 = ":"..protocol.."/"..domain;
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208
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209 HA1 = md5(A1, true);
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210 HA2 = md5(A2, true);
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211
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212 KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
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213 local rspauth = md5(KD, true);
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214 self.authenticated = true;
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215 --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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216 return "challenge", serialize({rspauth = rspauth});
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217 else
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218 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated."
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219 end
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220 elseif self.step == 3 then
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221 if self.authenticated ~= nil then return "success"
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222 else return "failure", "malformed-request" end
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223 end
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224 end
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225
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226 function init(registerMechanism)
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227 registerMechanism("DIGEST-MD5", {"plain"}, digest);
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228 end
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229
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230 return _M;