prosody
b0515ed4d9d7
util/sasl/digest-md5.lua

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util/sasl/digest-md5.lua @ 2996:b0515ed4d9d7

util.sasl: 2009 -> 2010 in copyright header.
author Tobias Markmann <tm@ayena.de>
date Fri, 12 Mar 2010 18:37:51 +0100
parent 2991:0fa3a7c885bd
child 2998:36c169ed1576
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 if type(message) ~= "table" then error("serialize needs an argument of type table.") end
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54
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55 -- testing all possible values
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56 if message["realm"] then data = data..[[realm="]]..message.realm..[[",]] end
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57 if message["nonce"] then data = data..[[nonce="]]..message.nonce..[[",]] end
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58 if message["qop"] then data = data..[[qop="]]..message.qop..[[",]] end
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59 if message["charset"] then data = data..[[charset=]]..message.charset.."," end
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60 if message["algorithm"] then data = data..[[algorithm=]]..message.algorithm.."," end
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61 if message["rspauth"] then data = data..[[rspauth=]]..message.rspauth.."," end
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62 data = data:gsub(",$", "")
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63 return data
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64 end
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65
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66 local function utf8tolatin1ifpossible(passwd)
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67 local i = 1;
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68 while i <= #passwd do
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69 local passwd_i = to_byte(passwd:sub(i, i));
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70 if passwd_i > 0x7F then
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71 if passwd_i < 0xC0 or passwd_i > 0xC3 then
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72 return passwd;
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73 end
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74 i = i + 1;
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75 passwd_i = to_byte(passwd:sub(i, i));
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76 if passwd_i < 0x80 or passwd_i > 0xBF then
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77 return passwd;
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78 end
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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
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83 local p = {};
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84 local j = 0;
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85 i = 1;
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86 while (i <= #passwd) do
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87 local passwd_i = to_byte(passwd:sub(i, i));
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88 if passwd_i > 0x7F then
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89 i = i + 1;
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90 local passwd_i_1 = to_byte(passwd:sub(i, i));
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91 t_insert(p, to_char(passwd_i%4*64 + passwd_i_1%64)); -- I'm so clever
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92 else
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93 t_insert(p, to_char(passwd_i));
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94 end
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95 i = i + 1;
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96 end
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97 return t_concat(p);
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98 end
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99 local function latin1toutf8(str)
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100 local p = {};
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101 for ch in s_gmatch(str, ".") do
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102 ch = to_byte(ch);
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103 if (ch < 0x80) then
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104 t_insert(p, to_char(ch));
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105 elseif (ch < 0xC0) then
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106 t_insert(p, to_char(0xC2, ch));
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107 else
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108 t_insert(p, to_char(0xC3, ch - 64));
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109 end
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110 end
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111 return t_concat(p);
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112 end
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113 local function parse(data)
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114 local message = {}
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115 -- COMPAT: %z in the pattern to work around jwchat bug (sends "charset=utf-8\0")
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116 for k, v in s_gmatch(data, [[([%w%-]+)="?([^",%z]*)"?,?]]) do -- FIXME The hacky regex makes me shudder
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117 message[k] = v;
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118 end
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119 return message;
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120 end
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121
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122 if not self.nonce then
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123 self.nonce = generate_uuid();
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124 self.step = 0;
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125 self.nonce_count = {};
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126 end
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127
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128 self.step = self.step + 1;
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129 if (self.step == 1) then
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130 local challenge = serialize({ nonce = self.nonce,
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131 qop = "auth",
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132 charset = "utf-8",
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133 algorithm = "md5-sess",
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134 realm = self.realm});
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135 return "challenge", challenge;
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136 elseif (self.step == 2) then
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137 local response = parse(message);
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138 -- check for replay attack
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139 if response["nc"] then
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140 if self.nonce_count[response["nc"]] then return "failure", "not-authorized" end
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141 end
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142
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143 -- check for username, it's REQUIRED by RFC 2831
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144 if not response["username"] then
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145 return "failure", "malformed-request";
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146 end
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147 self["username"] = response["username"];
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148
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149 -- check for nonce, ...
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150 if not response["nonce"] then
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151 return "failure", "malformed-request";
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152 else
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153 -- check if it's the right nonce
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154 if response["nonce"] ~= tostring(self.nonce) then return "failure", "malformed-request" end
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155 end
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156
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157 if not response["cnonce"] then return "failure", "malformed-request", "Missing entry for cnonce in SASL message." end
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158 if not response["qop"] then response["qop"] = "auth" end
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159
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160 if response["realm"] == nil or response["realm"] == "" then
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161 response["realm"] = "";
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162 elseif response["realm"] ~= self.realm then
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163 return "failure", "not-authorized", "Incorrect realm value";
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164 end
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165
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166 local decoder;
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167 if response["charset"] == nil then
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168 decoder = utf8tolatin1ifpossible;
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169 elseif response["charset"] ~= "utf-8" then
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170 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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171 end
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172
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173 local domain = "";
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174 local protocol = "";
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175 if response["digest-uri"] then
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176 protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$");
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177 if protocol == nil or domain == nil then return "failure", "malformed-request" end
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178 else
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179 return "failure", "malformed-request", "Missing entry for digest-uri in SASL message."
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180 end
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181
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182 --TODO maybe realm support
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183 self.username = response["username"];
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184 local Y, state;
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185 if self.profile.plain then
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186 local password, state = self.profile.plain(response["username"], self.realm)
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187 if state == nil then return "failure", "not-authorized"
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188 elseif state == false then return "failure", "account-disabled" end
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189 Y = md5(response["username"]..":"..response["realm"]..":"..password);
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190 elseif self.profile["digest-md5"] then
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191 Y, state = self.profile["digest-md5"](response["username"], self.realm, response["realm"], response["charset"])
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192 if state == nil then return "failure", "not-authorized"
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193 elseif state == false then return "failure", "account-disabled" end
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194 elseif self.profile["digest-md5-test"] then
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195 -- TODO
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196 end
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197 --local password_encoding, Y = self.credentials_handler("DIGEST-MD5", response["username"], self.realm, response["realm"], decoder);
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198 --if Y == nil then return "failure", "not-authorized"
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199 --elseif Y == false then return "failure", "account-disabled" end
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200 local A1 = "";
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201 if response.authzid then
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202 if response.authzid == self.username or response.authzid == self.username.."@"..self.realm then
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203 -- COMPAT
2193
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204 log("warn", "Client is violating RFC 3920 (section 6.1, point 7).");
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205 A1 = Y..":"..response["nonce"]..":"..response["cnonce"]..":"..response.authzid;
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206 else
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207 return "failure", "invalid-authzid";
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208 end
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209 else
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210 A1 = Y..":"..response["nonce"]..":"..response["cnonce"];
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211 end
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212 local A2 = "AUTHENTICATE:"..protocol.."/"..domain;
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213
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214 local HA1 = md5(A1, true);
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215 local HA2 = md5(A2, true);
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216
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217 local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2;
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218 local response_value = md5(KD, true);
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219
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220 if response_value == response["response"] then
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221 -- calculate rspauth
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222 A2 = ":"..protocol.."/"..domain;
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223
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224 HA1 = md5(A1, true);
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225 HA2 = md5(A2, true);
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226
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227 KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
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228 local rspauth = md5(KD, true);
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229 self.authenticated = true;
2568
25e1a544a096 util.sasl.digest-md5: Revert changeset 6094a4e2b6f3 as it breaks some clients, re-visit some time down the line
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parents: 2211
diff changeset
230 --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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diff changeset
231 return "challenge", serialize({rspauth = rspauth});
2186
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232 else
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233 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated."
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234 end
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diff changeset
235 elseif self.step == 3 then
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236 if self.authenticated ~= nil then return "success"
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237 else return "failure", "malformed-request" end
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diff changeset
238 end
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239 end
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240
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diff changeset
241 function init(registerMechanism)
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diff changeset
242 registerMechanism("DIGEST-MD5", {"plain"}, digest);
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243 end
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244
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245 return _M;