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util/sasl.lua @ 508:4fd60ae97535
Converting latin encoded responsed to utf-8 when needed.
author | Tobias Markmann <tm@ayena.de> |
---|---|
date | Sun, 30 Nov 2008 17:34:47 +0100 |
parent | 507:4d3ccc6b5817 |
child | 519:cccd610a0ef9 |
rev | line source |
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15
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1 |
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2 local md5 = require "util.hashes".md5; |
38 | 3 local log = require "util.logger".init("sasl"); |
4 local tostring = tostring; | |
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; |
38 | 9 local s_match = string.match; |
277
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10 local gmatch = string.gmatch |
280
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11 local string = string |
276
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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 |
496
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17 local idna_unicode = require "util.encodings".idna.to_unicode |
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18 |
38 | 19 module "sasl" |
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} |
297
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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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30 |
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31 if authentication == nil or password == nil then return "failure", "malformed-request" end |
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32 |
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33 local password_encoding, correct_password = self.password_handler(authentication, self.realm, "PLAIN") |
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34 |
405 | 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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37 |
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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) |
280
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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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70 |
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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 = {} |
458 | 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 = 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 |
508
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135 if response["charset"] == nil then |
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136 response["username"] = latin1toutf8(response["username"]) |
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137 response["realm"] = latin1toutf8(response["realm"]) |
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138 elseif response["charset"] ~= "utf-8" then |
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139 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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140 end |
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141 |
294
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142 local domain = "" |
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143 local protocol = "" |
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144 if response["digest-uri"] then |
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145 protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$") |
402
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146 if protocol == nil or domain == nil then return "failure", "malformed-request" end |
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147 else |
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148 return "failure", "malformed-request", "Missing entry for digest-uri in SASL message." |
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149 end |
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150 |
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151 --TODO maybe realm support |
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152 self.username = response["username"] |
505
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153 local password_encoding, Y = self.password_handler(response["username"], response["realm"], "DIGEST-MD5") |
405 | 154 if Y == nil then return "failure", "not-authorized" |
404
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155 elseif Y == false then return "failure", "account-disabled" end |
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156 |
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157 local A1 = Y..":"..response["nonce"]..":"..response["cnonce"]--:authzid |
472
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158 local A2 = "AUTHENTICATE:"..protocol.."/"..idna_ascii(domain) |
294
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159 |
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160 local HA1 = md5(A1, true) |
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161 local HA2 = md5(A2, true) |
294
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162 |
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163 local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2 |
449
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164 local response_value = md5(KD, true) |
294
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165 |
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166 if response_value == response["response"] then |
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167 -- calculate rspauth |
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168 A2 = ":"..protocol.."/"..idna_ascii(domain) |
294
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169 |
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170 HA1 = md5(A1, true) |
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171 HA2 = md5(A2, true) |
294
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172 |
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173 KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2 |
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174 local rspauth = md5(KD, true) |
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175 self.authenticated = true |
294
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176 return "challenge", serialize({rspauth = rspauth}) |
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177 else |
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178 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated." |
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179 end |
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180 elseif self.step == 3 then |
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181 if self.authenticated ~= nil then return "success" |
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182 else return "failure", "malformed-request" end |
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183 end |
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184 end |
276
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185 return object |
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186 end |
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187 |
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188 function new(mechanism, realm, password_handler) |
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189 local object |
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190 if mechanism == "PLAIN" then object = new_plain(realm, password_handler) |
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191 elseif mechanism == "DIGEST-MD5" then object = new_digest_md5(realm, password_handler) |
38 | 192 else |
193 log("debug", "Unsupported SASL mechanism: "..tostring(mechanism)); | |
285
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194 return nil |
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195 end |
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196 return object |
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197 end |
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198 |
38 | 199 return _M; |