prosody
4678aa4567c8
util/sasl/digest-md5.lua

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util/sasl/digest-md5.lua @ 2215:4678aa4567c8

SASL: Using locally mapped s_gmatch instead of unavailable gmatch.
author Tobias Markmann <tm@ayena.de>
date Wed, 25 Nov 2009 19:46:22 +0100
parent 2212:7cb6460b18d8
child 2255:92e329e1cd99
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 local function digest_response()
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32
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33 return response, A1, A2
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34 end
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35
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36 local function digest(self, message)
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37 --TODO complete support for authzid
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38
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39 local function serialize(message)
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40 local data = ""
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41
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42 if type(message) ~= "table" then error("serialize needs an argument of type table.") end
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43
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44 -- testing all possible values
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45 if message["realm"] then data = data..[[realm="]]..message.realm..[[",]] end
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46 if message["nonce"] then data = data..[[nonce="]]..message.nonce..[[",]] end
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47 if message["qop"] then data = data..[[qop="]]..message.qop..[[",]] end
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48 if message["charset"] then data = data..[[charset=]]..message.charset.."," end
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49 if message["algorithm"] then data = data..[[algorithm=]]..message.algorithm.."," end
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50 if message["rspauth"] then data = data..[[rspauth=]]..message.rspauth.."," end
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51 data = data:gsub(",$", "")
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52 return data
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53 end
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54
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55 local function utf8tolatin1ifpossible(passwd)
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56 local i = 1;
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57 while i <= #passwd do
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58 local passwd_i = to_byte(passwd:sub(i, i));
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59 if passwd_i > 0x7F then
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60 if passwd_i < 0xC0 or passwd_i > 0xC3 then
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61 return passwd;
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62 end
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63 i = i + 1;
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64 passwd_i = to_byte(passwd:sub(i, i));
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65 if passwd_i < 0x80 or passwd_i > 0xBF then
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66 return passwd;
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67 end
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68 end
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69 i = i + 1;
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70 end
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71
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72 local p = {};
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73 local j = 0;
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74 i = 1;
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75 while (i <= #passwd) do
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76 local passwd_i = to_byte(passwd:sub(i, i));
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77 if passwd_i > 0x7F then
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78 i = i + 1;
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79 local passwd_i_1 = to_byte(passwd:sub(i, i));
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80 t_insert(p, to_char(passwd_i%4*64 + passwd_i_1%64)); -- I'm so clever
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81 else
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82 t_insert(p, to_char(passwd_i));
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83 end
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84 i = i + 1;
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85 end
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86 return t_concat(p);
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87 end
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88 local function latin1toutf8(str)
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89 local p = {};
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90 for ch in s_gmatch(str, ".") do
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91 ch = to_byte(ch);
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92 if (ch < 0x80) then
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93 t_insert(p, to_char(ch));
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94 elseif (ch < 0xC0) then
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95 t_insert(p, to_char(0xC2, ch));
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96 else
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97 t_insert(p, to_char(0xC3, ch - 64));
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98 end
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99 end
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100 return t_concat(p);
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101 end
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102 local function parse(data)
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103 local message = {}
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104 -- COMPAT: %z in the pattern to work around jwchat bug (sends "charset=utf-8\0")
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105 for k, v in s_gmatch(data, [[([%w%-]+)="?([^",%z]*)"?,?]]) do -- FIXME The hacky regex makes me shudder
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106 message[k] = v;
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107 end
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108 return message;
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109 end
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110
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111 if not self.nonce then
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112 self.nonce = generate_uuid();
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113 self.step = 0;
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114 self.nonce_count = {};
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115 end
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116
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117 self.step = self.step + 1;
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118 if (self.step == 1) then
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119 local challenge = serialize({ nonce = self.nonce,
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120 qop = "auth",
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121 charset = "utf-8",
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122 algorithm = "md5-sess",
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123 realm = self.realm});
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124 return "challenge", challenge;
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125 elseif (self.step == 2) then
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126 local response = parse(message);
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127 -- check for replay attack
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128 if response["nc"] then
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129 if self.nonce_count[response["nc"]] then return "failure", "not-authorized" end
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130 end
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131
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132 -- check for username, it's REQUIRED by RFC 2831
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133 if not response["username"] then
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134 return "failure", "malformed-request";
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135 end
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136 self["username"] = response["username"];
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137
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138 -- check for nonce, ...
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139 if not response["nonce"] then
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140 return "failure", "malformed-request";
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141 else
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142 -- check if it's the right nonce
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143 if response["nonce"] ~= tostring(self.nonce) then return "failure", "malformed-request" end
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144 end
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145
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146 if not response["cnonce"] then return "failure", "malformed-request", "Missing entry for cnonce in SASL message." end
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147 if not response["qop"] then response["qop"] = "auth" end
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148
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149 if response["realm"] == nil or response["realm"] == "" then
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150 response["realm"] = "";
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151 elseif response["realm"] ~= self.realm then
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152 return "failure", "not-authorized", "Incorrect realm value";
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153 end
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154
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155 local decoder;
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156 if response["charset"] == nil then
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157 decoder = utf8tolatin1ifpossible;
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158 elseif response["charset"] ~= "utf-8" then
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159 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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160 end
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161
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162 local domain = "";
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163 local protocol = "";
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164 if response["digest-uri"] then
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165 protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$");
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166 if protocol == nil or domain == nil then return "failure", "malformed-request" end
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167 else
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168 return "failure", "malformed-request", "Missing entry for digest-uri in SASL message."
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169 end
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170
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171 --TODO maybe realm support
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172 self.username = response["username"];
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173 if self.profile.plain then
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174 local password, state = self.profile.plain(response["username"], self.realm)
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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
2189
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177 Y = md5(response["username"]..":"..response["realm"]..":"..password);
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178 elseif self.profile["digest-md5"] then
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179 local Y, state = self.profile["digest-md5"](response["username"], self.realm, response["realm"], response["charset"])
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180 if state == nil then return "failure", "not-authorized"
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181 elseif state == false then return "failure", "account-disabled" end
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182 elseif self.profile["digest-md5-test"] then
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183 -- TODO
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184 end
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185 --local password_encoding, Y = self.credentials_handler("DIGEST-MD5", response["username"], self.realm, response["realm"], decoder);
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186 --if Y == nil then return "failure", "not-authorized"
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187 --elseif Y == false then return "failure", "account-disabled" end
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188 local A1 = "";
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189 if response.authzid then
2193
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190 if response.authzid == self.username or response.authzid == self.username.."@"..self.realm then
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191 -- COMPAT
2193
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192 log("warn", "Client is violating RFC 3920 (section 6.1, point 7).");
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193 A1 = Y..":"..response["nonce"]..":"..response["cnonce"]..":"..response.authzid;
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194 else
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195 return "failure", "invalid-authzid";
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196 end
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197 else
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198 A1 = Y..":"..response["nonce"]..":"..response["cnonce"];
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199 end
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200 local A2 = "AUTHENTICATE:"..protocol.."/"..domain;
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201
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202 local HA1 = md5(A1, true);
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203 local HA2 = md5(A2, true);
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204
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205 local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2;
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206 local response_value = md5(KD, true);
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207
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208 if response_value == response["response"] then
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209 -- calculate rspauth
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210 A2 = ":"..protocol.."/"..domain;
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211
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212 HA1 = md5(A1, true);
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213 HA2 = md5(A2, true);
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214
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215 KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
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216 local rspauth = md5(KD, true);
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217 self.authenticated = true;
2211
6094a4e2b6f3 Reduce needed roundtrips during DIGEST-MD5 login.
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diff changeset
218 return "success", serialize({rspauth = rspauth});
2186
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219 else
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220 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated."
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221 end
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diff changeset
222 elseif self.step == 3 then
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223 if self.authenticated ~= nil then return "success"
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224 else return "failure", "malformed-request" end
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225 end
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226 end
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227
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diff changeset
228 function init(registerMechanism)
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diff changeset
229 registerMechanism("DIGEST-MD5", {"plain"}, digest);
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230 end
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231
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diff changeset
232 return _M;