prosody
15b375870b40
util/sasl.lua

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util/sasl.lua @ 297:15b375870b40

Providing some human readable error messages and some fixes.
author Tobias Markmann <tm@ayena.de>
date Sat, 15 Nov 2008 22:36:22 +0100
parent 294:5d861d6e5bbd
child 401:96e2019d112d
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1
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2 local md5 = require "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 s_match = string.match;
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8 local gmatch = string.gmatch
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9 local string = string
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10 local math = require "math"
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11 local type = type
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12 local error = error
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13 local print = print
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15 module "sasl"
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16
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17 local function new_plain(realm, password_handler)
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18 local object = { mechanism = "PLAIN", realm = realm, password_handler = password_handler}
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19 function object.feed(self, message)
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20
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21 if message == "" or message == nil then return "failure", "malformed-request" end
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22 local response = message
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23 local authorization = s_match(response, "([^&%z]+)")
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24 local authentication = s_match(response, "%z([^&%z]+)%z")
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25 local password = s_match(response, "%z[^&%z]+%z([^&%z]+)")
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26
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27 local password_encoding, correct_password = self.password_handler(authentication, self.realm, "PLAIN")
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28
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29 local claimed_password = ""
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30 if password_encoding == nil then claimed_password = password
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31 else claimed_password = password_encoding(password) end
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33 self.username = authentication
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34 if claimed_password == correct_password then
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35 log("debug", "success")
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36 return "success"
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37 else
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38 log("debug", "failure")
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39 return "failure", "not-authorized"
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40 end
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41 end
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42 return object
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43 end
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44
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45 local function new_digest_md5(realm, password_handler)
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46 --TODO maybe support for authzid
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47
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48 local function serialize(message)
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49 local data = ""
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50
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51 if type(message) ~= "table" then error("serialize needs an argument of type table.") end
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52
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53 -- testing all possible values
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54 if message["nonce"] then data = data..[[nonce="]]..message.nonce..[[",]] end
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55 if message["qop"] then data = data..[[qop="]]..message.qop..[[",]] end
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56 if message["charset"] then data = data..[[charset=]]..message.charset.."," end
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57 if message["algorithm"] then data = data..[[algorithm=]]..message.algorithm.."," end
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58 if message["realm"] then data = data..[[realm="]]..message.realm..[[",]] end
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59 if message["rspauth"] then data = data..[[rspauth=]]..message.rspauth.."," end
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60 data = data:gsub(",$", "")
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61 return data
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62 end
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63
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64 local function parse(data)
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65 message = {}
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66 log("debug", "parse-message: "..data)
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67 for k, v in gmatch(data, [[([%w%-]+)="?([%w%-%/%.%+=]+)"?,?]]) do
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68 message[k] = v
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69 log("debug", " "..k.." = "..v)
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70 end
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71 return message
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72 end
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73
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74 local object = { mechanism = "DIGEST-MD5", realm = realm, password_handler = password_handler}
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75
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76 --TODO: something better than math.random would be nice, maybe OpenSSL's random number generator
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77 object.nonce = generate_uuid()
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78 object.step = 0
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79 object.nonce_count = {}
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80
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81 function object.feed(self, message)
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82 log("debug", "SASL step: "..self.step)
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83 self.step = self.step + 1
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84 if (self.step == 1) then
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85 local challenge = serialize({ nonce = object.nonce,
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86 qop = "auth",
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87 charset = "utf-8",
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88 algorithm = "md5-sess",
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89 realm = self.realm});
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90 log("debug", "challenge: "..challenge)
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91 return "challenge", challenge
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92 elseif (self.step == 2) then
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93 local response = parse(message)
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94 -- check for replay attack
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95 if response["nc"] then
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96 if self.nonce_count[response["nc"]] then return "failure", "not-authorized" end
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97 end
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98
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99 -- check for username, it's REQUIRED by RFC 2831
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100 if not response["username"] then
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101 return "failure", "malformed-request"
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102 end
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103 self["username"] = response["username"]
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104
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105 -- check for nonce, ...
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106 if not response["nonce"] then
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107 return "failure", "malformed-request"
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108 else
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109 -- check if it's the right nonce
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110 if response["nonce"] ~= tostring(self.nonce) then return "failure", "malformed-request" end
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111 end
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112
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113 if not response["cnonce"] then return "failure", "malformed-request", "Missing entry for cnonce in SASL message." end
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114 if not response["qop"] then response["qop"] = "auth" end
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115
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116 if response["realm"] == nil then response["realm"] = "" end
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117
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118 local domain = ""
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119 local protocol = ""
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120 if response["digest-uri"] then
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121 protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$")
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122 else
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123 return "failure", "malformed-request", "Missing entry for digest-uri in SASL message."
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124 end
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125
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126 --TODO maybe realm support
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127 self.username = response["username"]
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128 local password_encoding, Y = self.password_handler(response["username"], response["realm"], "DIGEST-MD5")
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129 local A1 = Y..":"..response["nonce"]..":"..response["cnonce"]--:authzid
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130 local A2 = "AUTHENTICATE:"..protocol.."/"..domain
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131
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132 local HA1 = md5.sumhexa(A1)
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133 local HA2 = md5.sumhexa(A2)
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134
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135 local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
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136 local response_value = md5.sumhexa(KD)
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137
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138 log("debug", "response_value: "..response_value);
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139 log("debug", "response: "..response["response"]);
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140 if response_value == response["response"] then
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141 -- calculate rspauth
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142 A2 = ":"..protocol.."/"..domain
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143
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144 HA1 = md5.sumhexa(A1)
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145 HA2 = md5.sumhexa(A2)
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146
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147 KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
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148 local rspauth = md5.sumhexa(KD)
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149 self.authenticated = true
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150 return "challenge", serialize({rspauth = rspauth})
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151 else
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152 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated."
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153 end
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154 elseif self.step == 3 then
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155 if self.authenticated ~= nil then return "success"
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156 else return "failure", "malformed-request" end
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157 end
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158 end
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159 return object
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160 end
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161
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162 function new(mechanism, realm, password_handler)
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163 local object
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164 if mechanism == "PLAIN" then object = new_plain(realm, password_handler)
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165 elseif mechanism == "DIGEST-MD5" then object = new_digest_md5(realm, password_handler)
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166 else
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167 log("debug", "Unsupported SASL mechanism: "..tostring(mechanism));
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168 return nil
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169 end
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170 return object
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171 end
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172
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173 return _M;