prosody
efc5184effa1
util/sasl.lua

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util/sasl.lua @ 504:efc5184effa1

Added function latin1toutf8 to sasl.lua, for processing non-utf8 responses
author Waqas Hussain <waqas20@gmail.com>
date Sun, 30 Nov 2008 20:58:48 +0500
parent 496:b3251b137d68
child 507:4d3ccc6b5817
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1
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2 local md5 = require "util.hashes".md5;
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3 local log = require "util.logger".init("sasl");
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4 local tostring = tostring;
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5 local st = require "util.stanza";
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6 local generate_uuid = require "util.uuid".generate;
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7 local t_insert, t_concat = table.insert, table.concat;
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8 local to_byte, to_char = string.byte, string.char;
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9 local s_match = string.match;
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10 local gmatch = string.gmatch
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11 local string = string
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12 local math = require "math"
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13 local type = type
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14 local error = error
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15 local print = print
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16 local idna_ascii = require "util.encodings".idna.to_ascii
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17 local idna_unicode = require "util.encodings".idna.to_unicode
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18
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19 module "sasl"
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20
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21 local function new_plain(realm, password_handler)
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22 local object = { mechanism = "PLAIN", realm = realm, password_handler = password_handler}
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23 function object.feed(self, message)
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24
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25 if message == "" or message == nil then return "failure", "malformed-request" end
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26 local response = message
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27 local authorization = s_match(response, "([^&%z]+)")
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28 local authentication = s_match(response, "%z([^&%z]+)%z")
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29 local password = s_match(response, "%z[^&%z]+%z([^&%z]+)")
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31 if authentication == nil or password == nil then return "failure", "malformed-request" end
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33 local password_encoding, correct_password = self.password_handler(authentication, self.realm, "PLAIN")
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35 if correct_password == nil then return "failure", "not-authorized"
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36 elseif correct_password == false then return "failure", "account-disabled" end
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38 local claimed_password = ""
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39 if password_encoding == nil then claimed_password = password
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40 else claimed_password = password_encoding(password) end
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41
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42 self.username = authentication
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43 if claimed_password == correct_password then
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44 return "success"
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45 else
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46 return "failure", "not-authorized"
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47 end
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48 end
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49 return object
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50 end
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51
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52 local function new_digest_md5(realm, password_handler)
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53 --TODO maybe support for authzid
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54
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55 local function serialize(message)
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56 local data = ""
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57
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58 if type(message) ~= "table" then error("serialize needs an argument of type table.") end
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59
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60 -- testing all possible values
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61 if message["nonce"] then data = data..[[nonce="]]..message.nonce..[[",]] end
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62 if message["qop"] then data = data..[[qop="]]..message.qop..[[",]] end
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63 if message["charset"] then data = data..[[charset=]]..message.charset.."," end
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64 if message["algorithm"] then data = data..[[algorithm=]]..message.algorithm.."," end
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65 if message["realm"] then data = data..[[realm="]]..message.realm..[[",]] end
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66 if message["rspauth"] then data = data..[[rspauth=]]..message.rspauth.."," end
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67 data = data:gsub(",$", "")
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68 return data
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69 end
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71 local function latin1toutf8(str)
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72 local p = {};
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73 for ch in gmatch(str, ".") do
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74 ch = to_byte(ch);
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75 if (ch < 0x80) then
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76 t_insert(p, to_char(ch));
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77 elseif (ch < 0xC0) then
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78 t_insert(p, to_char(0xC2, ch));
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79 else
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80 t_insert(p, to_char(0xC3, ch - 64));
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81 end
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82 end
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83 return t_concat(p);
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84 end
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85 local function parse(data)
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86 message = {}
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87 for k, v in gmatch(data, [[([%w%-]+)="?([^",]*)"?,?]]) do -- FIXME The hacky regex makes me shudder
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88 message[k] = v
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89 end
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90 return message
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91 end
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92
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93 local object = { mechanism = "DIGEST-MD5", realm = realm, password_handler = password_handler}
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94
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95 --TODO: something better than math.random would be nice, maybe OpenSSL's random number generator
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96 object.nonce = generate_uuid()
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97 object.step = 0
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98 object.nonce_count = {}
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99
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100 function object.feed(self, message)
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101 self.step = self.step + 1
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102 if (self.step == 1) then
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103 local challenge = serialize({ nonce = object.nonce,
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104 qop = "auth",
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105 charset = "utf-8",
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106 algorithm = "md5-sess",
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107 realm = idna_ascii(self.realm)});
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108 return "challenge", challenge
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109 elseif (self.step == 2) then
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110 local response = parse(message)
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111 -- check for replay attack
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112 if response["nc"] then
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113 if self.nonce_count[response["nc"]] then return "failure", "not-authorized" end
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114 end
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115
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116 -- check for username, it's REQUIRED by RFC 2831
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117 if not response["username"] then
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118 return "failure", "malformed-request"
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119 end
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120 self["username"] = response["username"]
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121
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122 -- check for nonce, ...
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123 if not response["nonce"] then
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124 return "failure", "malformed-request"
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125 else
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126 -- check if it's the right nonce
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127 if response["nonce"] ~= tostring(self.nonce) then return "failure", "malformed-request" end
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128 end
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129
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130 if not response["cnonce"] then return "failure", "malformed-request", "Missing entry for cnonce in SASL message." end
294
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131 if not response["qop"] then response["qop"] = "auth" end
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132
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133 if response["realm"] == nil then response["realm"] = "" end
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134
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135 local domain = ""
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136 local protocol = ""
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137 if response["digest-uri"] then
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138 protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$")
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139 if protocol == nil or domain == nil then return "failure", "malformed-request" end
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140 else
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141 return "failure", "malformed-request", "Missing entry for digest-uri in SASL message."
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142 end
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143
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144 --TODO maybe realm support
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145 self.username = response["username"]
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146 local password_encoding, Y = self.password_handler(response["username"], idna_unicode(response["realm"]), "DIGEST-MD5")
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147 if Y == nil then return "failure", "not-authorized"
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148 elseif Y == false then return "failure", "account-disabled" end
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149
294
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150 local A1 = Y..":"..response["nonce"]..":"..response["cnonce"]--:authzid
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151 local A2 = "AUTHENTICATE:"..protocol.."/"..idna_ascii(domain)
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152
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153 local HA1 = md5(A1, true)
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154 local HA2 = md5(A2, true)
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155
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156 local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
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157 local response_value = md5(KD, true)
294
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158
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159 if response_value == response["response"] then
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160 -- calculate rspauth
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161 A2 = ":"..protocol.."/"..idna_ascii(domain)
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162
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163 HA1 = md5(A1, true)
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164 HA2 = md5(A2, true)
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165
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166 KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
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167 local rspauth = md5(KD, true)
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168 self.authenticated = true
294
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169 return "challenge", serialize({rspauth = rspauth})
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170 else
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171 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated."
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172 end
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173 elseif self.step == 3 then
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174 if self.authenticated ~= nil then return "success"
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175 else return "failure", "malformed-request" end
294
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176 end
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177 end
276
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178 return object
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179 end
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180
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181 function new(mechanism, realm, password_handler)
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182 local object
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183 if mechanism == "PLAIN" then object = new_plain(realm, password_handler)
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184 elseif mechanism == "DIGEST-MD5" then object = new_digest_md5(realm, password_handler)
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185 else
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186 log("debug", "Unsupported SASL mechanism: "..tostring(mechanism));
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187 return nil
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188 end
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189 return object
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190 end
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191
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192 return _M;