prosody
00c2fc751f50
util/sasl.lua

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util/sasl.lua @ 277:00c2fc751f50

Fixing some parsing and some other stuff.
author Tobias Markmann <tm@ayena.de>
date Sun, 09 Nov 2008 22:45:17 +0100
parent 276:30893439d5d1
child 278:770a78cd38d7
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rev   line source
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1
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2 local base64 = require "base64"
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3 local md5 = require "md5"
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4 local crypto = require "crypto"
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5 local log = require "util.logger".init("sasl");
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6 local tostring = tostring;
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7 local st = require "util.stanza";
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8 local generate_uuid = require "util.uuid".generate;
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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 math = require "math"
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12 local type = type
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13 local error = error
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14 local print = print
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16 module "sasl"
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17
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18 local function new_plain(onAuth, onSuccess, onFail, onWrite)
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19 local object = { mechanism = "PLAIN", onAuth = onAuth, onSuccess = onSuccess, onFail = onFail,
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20 onWrite = onWrite}
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21 local challenge = base64.encode("");
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22 --onWrite(st.stanza("challenge", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"}):text(challenge))
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23 object.feed = function(self, stanza)
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24 if stanza.name ~= "response" and stanza.name ~= "auth" then self.onFail("invalid-stanza-tag") end
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25 if stanza.attr.xmlns ~= "urn:ietf:params:xml:ns:xmpp-sasl" then self.onFail("invalid-stanza-namespace") end
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26 local response = base64.decode(stanza[1])
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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 if self.onAuth(authentication, password) == true then
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31 self.onWrite(st.stanza("success", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"}))
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32 self.onSuccess(authentication)
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33 else
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34 self.onWrite(st.stanza("failure", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"}):tag("temporary-auth-failure"));
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35 end
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36 end
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37 return object
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38 end
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41 --[[
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42 SERVER:
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43 nonce="3145176401",qop="auth",charset=utf-8,algorithm=md5-sess
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45 CLIENT: username="tobiasfar",nonce="3145176401",cnonce="pJiW7hzeZLvOSAf7gBzwTzLWe4obYOVDlnNESzQCzGg=",nc=00000001,digest-uri="xmpp/jabber.org",qop=auth,response=99a93ba75235136e6403c3a2ba37089d,charset=utf-8
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47 username="tobias",nonce="4406697386",cnonce="wUnT7vYrOB0V8D/lKd5bhpaNCk+hLJwc8T4CBCqp7WM=",nc=00000001,digest-uri="xmpp/luaetta.ath.cx",qop=auth,response=d202b8a1bdf8204816fb23c5f87b6b63,charset=utf-8
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49 SERVER:
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50 rspauth=ab66d28c260e97da577ce3aac46a8991
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51 ]]--
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52 local function new_digest_md5(onAuth, onSuccess, onFail, onWrite)
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53 local function H(s)
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54 return md5.sum(s)
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55 end
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56
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57 local function KD(k, s)
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58 return H(k..":"..s)
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59 end
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60
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61 local function HEX(n)
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62 return md5.sumhexa(n)
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63 end
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64
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65 local function HMAC(k, s)
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66 return crypto.hmac.digest("md5", s, k, true)
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67 end
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68
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69 local function serialize(message)
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70 local data = ""
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71
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72 if type(message) ~= "table" then error("serialize needs an argument of type table.") end
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73
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74 -- testing all possible values
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75 if message["nonce"] then data = data..[[nonce="]]..message.nonce..[[",]] end
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76 if message["qop"] then data = data..[[qop="]]..message.qop..[[",]] end
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77 if message["charset"] then data = data..[[charset=]]..message.charset.."," end
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78 if message["algorithm"] then data = data..[[algorithm=]]..message.algorithm.."," end
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79 if message["rspauth"] then data = data..[[rspauth=]]..message.algorith.."," end
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80 data = data:gsub(",$", "")
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81 return data
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82 end
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83
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84 local function parse(data)
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85 message = {}
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86 for k, v in gmatch(data, [[([%w%-]+)="?([%w%-%/%.]+)"?,?]]) do
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87 message[k] = v
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88 end
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89 return message
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90 end
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91
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92 local object = { mechanism = "DIGEST-MD5", onAuth = onAuth, onSuccess = onSuccess, onFail = onFail,
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93 onWrite = onWrite }
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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 = math.random(0, 9)
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97 for i = 1, 9 do object.nonce = object.nonce..math.random(0, 9) end
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98 object.step = 1
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99 object.nonce_count = {}
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100 local challenge = base64.encode(serialize({ nonce = object.nonce,
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101 qop = "auth",
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102 charset = "utf-8",
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103 algorithm = "md5-sess"} ));
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104 object.onWrite(st.stanza("challenge", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"}):text(challenge))
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105 object.feed = function(self, stanza)
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106 if stanza.name ~= "response" and stanza.name ~= "auth" then self.onFail("invalid-stanza-tag") end
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107 if stanza.attr.xmlns ~= "urn:ietf:params:xml:ns:xmpp-sasl" then self.onFail("invalid-stanza-namespace") end
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108 if stanza.name == "auth" then return end
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109 self.step = self.step + 1
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110 if (self.step == 2) then
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111 local response = parse(base64.decode(stanza[1]))
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112 -- check for replay attack
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113 if response["nonce-count"] then
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114 if self.nonce_count[response["nonce-count"]] then self.onFail("not-authorized") end
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115 end
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116
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117 -- check for username, it's REQUIRED by RFC 2831
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118 if not response["username"] then
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119 self.onFail("malformed-request")
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120 end
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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 self.onFail("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"] ~= self.nonce then self.onFail("malformed-request") end
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128 end
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129
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130 if not response["cnonce"] then self.onFail("malformed-request") end
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131 if not response["qop"] then response["qop"] = "auth" end
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132
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133 local hostname = ""
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134 local protocol = ""
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135 if response["digest-uri"] then
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136 protocol, hostname = response["digest-uri"]:match("(%w+)/(.*)$")
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137 else
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138 error("No digest-uri")
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139 end
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140
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141 -- compare response_value with own calculation
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142 local A1-- = H(response["username"]..":"..realm-value, ":", passwd } ),
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143 -- ":", nonce-value, ":", cnonce-value)
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144 local A2
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145
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146 --local response_value = HEX(KD(HEX(H(A1)), response["nonce"]..":"..response["nonce-count"]..":"..response["cnonce-value"]..":"..response["qop"]..":"..HEX(H(A2))))
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147
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148 if response["qop"] == "auth" then
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149
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150 else
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151
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152 end
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153
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154 --local response_value = HEX(KD(HEX(H(A1)), response["nonce"]..":"..response["nonce-count"]..":"..response["cnonce-value"]..":"..response["qop"]..":"..HEX(H(A2))))
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155
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156 end
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157 --[[
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158 local authorization = s_match(response, "([^&%z]+)")
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159 local authentication = s_match(response, "%z([^&%z]+)%z")
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160 local password = s_match(response, "%z[^&%z]+%z([^&%z]+)")
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161 if self.onAuth(authentication, password) == true then
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162 self.onWrite(st.stanza("success", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"}))
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163 self.onSuccess(authentication)
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164 else
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165 self.onWrite(st.stanza("failure", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"}):tag("temporary-auth-failure"));
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166 end]]--
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167 end
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168 return object
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169 end
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170
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171 function new(mechanism, onAuth, onSuccess, onFail, onWrite)
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172 local object
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173 if mechanism == "PLAIN" then object = new_plain(onAuth, onSuccess, onFail, onWrite)
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174 elseif mechanism == "DIGEST-MD5" then object = new_digest_md5(onAuth, onSuccess, onFail, onWrite)
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175 else
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176 log("debug", "Unsupported SASL mechanism: "..tostring(mechanism));
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177 onFail("unsupported-mechanism")
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178 end
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179 return object
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180 end
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181
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182 return _M;