prosody
516f4c901991
util/sasl.lua

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util/sasl.lua @ 280:516f4c901991

Rewrote SASL Digest-MD5 responce generating code, fixed some realm related issue and tested it successfully with Psi. Thanks to dwd, remko and jake.
author Tobias Markmann <tm@ayena.de>
date Wed, 12 Nov 2008 21:38:46 +0100
parent 278:770a78cd38d7
child 285:372d0891e8fd
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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 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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17 module "sasl"
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19 local function new_plain(onAuth, onSuccess, onFail, onWrite)
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20 local object = { mechanism = "PLAIN", onAuth = onAuth, onSuccess = onSuccess, onFail = onFail,
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21 onWrite = onWrite}
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22 local challenge = base64.encode("");
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23 --onWrite(st.stanza("challenge", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"}):text(challenge))
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24 object.feed = function(self, stanza)
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25 if stanza.name ~= "response" and stanza.name ~= "auth" then self.onFail("invalid-stanza-tag") end
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26 if stanza.attr.xmlns ~= "urn:ietf:params:xml:ns:xmpp-sasl" then self.onFail("invalid-stanza-namespace") end
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27 local response = base64.decode(stanza[1])
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28 local authorization = s_match(response, "([^&%z]+)")
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29 local authentication = s_match(response, "%z([^&%z]+)%z")
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30 local password = s_match(response, "%z[^&%z]+%z([^&%z]+)")
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31 if self.onAuth(authentication, password) == true then
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32 self.onWrite(st.stanza("success", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"}))
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33 self.onSuccess(authentication)
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34 else
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35 self.onWrite(st.stanza("failure", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"}):tag("temporary-auth-failure"));
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36 self.onFail("Wrong password.")
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37 end
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38 end
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39 return object
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40 end
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41
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42 local function new_digest_md5(onAuth, onSuccess, onFail, onWrite)
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43 --TODO maybe support for authzid
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45 local function serialize(message)
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46 local data = ""
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47
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48 if type(message) ~= "table" then error("serialize needs an argument of type table.") end
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49
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50 -- testing all possible values
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51 if message["nonce"] then data = data..[[nonce="]]..message.nonce..[[",]] end
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52 if message["qop"] then data = data..[[qop="]]..message.qop..[[",]] end
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53 if message["charset"] then data = data..[[charset=]]..message.charset.."," end
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54 if message["algorithm"] then data = data..[[algorithm=]]..message.algorithm.."," end
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55 if message["realm"] then data = data..[[realm="]]..message.realm..[[",]] end
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56 if message["rspauth"] then data = data..[[rspauth=]]..message.rspauth.."," end
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57 data = data:gsub(",$", "")
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58 return data
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59 end
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60
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61 local function parse(data)
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62 message = {}
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63 log("debug", "parse-message: "..data)
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64 for k, v in gmatch(data, [[([%w%-]+)="?([%w%-%/%.%+=]+)"?,?]]) do
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65 message[k] = v
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66 log("debug", " "..k.." = "..v)
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67 end
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68 return message
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69 end
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71 local object = { mechanism = "DIGEST-MD5", onAuth = onAuth, onSuccess = onSuccess, onFail = onFail,
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72 onWrite = onWrite }
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73
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74 --TODO: something better than math.random would be nice, maybe OpenSSL's random number generator
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75 object.nonce = generate_uuid()
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76 log("debug", "SASL nonce: "..object.nonce)
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77 object.step = 1
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78 object.nonce_count = {}
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79 local challenge = base64.encode(serialize({ nonce = object.nonce,
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80 qop = "auth",
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81 charset = "utf-8",
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82 algorithm = "md5-sess"} ));
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83 object.onWrite(st.stanza("challenge", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"}):text(challenge))
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84 object.feed = function(self, stanza)
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85 log("debug", "SASL step: "..self.step)
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86 if stanza.name ~= "response" and stanza.name ~= "auth" then self.onFail("invalid-stanza-tag") end
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87 if stanza.attr.xmlns ~= "urn:ietf:params:xml:ns:xmpp-sasl" then self.onFail("invalid-stanza-namespace") end
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88 if stanza.name == "auth" then return end
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89 self.step = self.step + 1
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90 if (self.step == 2) then
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91 local response = parse(base64.decode(stanza[1]))
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92 -- check for replay attack
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93 if response["nc"] then
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94 if self.nonce_count[response["nc"]] then self.onFail("not-authorized") end
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95 end
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96
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97 -- check for username, it's REQUIRED by RFC 2831
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98 if not response["username"] then
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99 self.onFail("malformed-request")
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100 end
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101 self["username"] = response["username"]
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102
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103 -- check for nonce, ...
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104 if not response["nonce"] then
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105 self.onFail("malformed-request")
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106 else
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107 -- check if it's the right nonce
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108 if response["nonce"] ~= tostring(self.nonce) then self.onFail("malformed-request") end
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109 end
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110
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111 if not response["cnonce"] then self.onFail("malformed-request") end
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112 if not response["qop"] then response["qop"] = "auth" end
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113
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114 if response["realm"] == nil then response["realm"] = "" end
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115
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116 local domain = ""
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117 local protocol = ""
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118 if response["digest-uri"] then
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119 protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$")
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120 else
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121 error("No digest-uri")
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122 end
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123
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124 -- compare response_value with own calculation
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125 --local A1 = usermanager.get_md5(response["username"], hostname)..":"..response["nonce"]..response["cnonce"]
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126
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127 --FIXME actual username and password here :P
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128 local X = "tobias:"..response["realm"]..":tobias"
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129 local Y = md5.sum(X)
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130 local A1 = Y..":"..response["nonce"]..":"..response["cnonce"]--:authzid
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131 local A2 = "AUTHENTICATE:"..protocol.."/"..domain
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132
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133 local HA1 = md5.sumhexa(A1)
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134 local HA2 = md5.sumhexa(A2)
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135
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136 local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
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137 local response_value = md5.sumhexa(KD)
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138
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139 log("debug", "response_value: "..response_value);
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140 log("debug", "response: "..response["response"]);
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141 if response_value == response["response"] then
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142 -- calculate rspauth
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143 A2 = ":"..protocol.."/"..domain
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144
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145 HA1 = md5.sumhexa(A1)
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146 HA2 = md5.sumhexa(A2)
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147
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148 KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
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149 local rspauth = md5.sumhexa(KD)
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150
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151 self.onWrite(st.stanza("challenge", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"}):text(base64.encode(serialize({rspauth = rspauth}))))
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152 else
280
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153 self.onWrite(st.stanza("response", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"}))
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154 self.onFail()
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155 end
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156 elseif self.step == 3 then
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157 if stanza.name == "response" then
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158 self.onWrite(st.stanza("success", {xmlns = "urn:ietf:params:xml:ns:xmpp-sasl"}))
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159 self.onSuccess(self.username)
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160 else
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161 self.onFail("Third step isn't a response stanza.")
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162 end
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163 end
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164 end
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165 return object
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166 end
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167
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168 function new(mechanism, onAuth, onSuccess, onFail, onWrite)
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169 local object
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170 if mechanism == "PLAIN" then object = new_plain(onAuth, onSuccess, onFail, onWrite)
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171 elseif mechanism == "DIGEST-MD5" then object = new_digest_md5(onAuth, onSuccess, onFail, onWrite)
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172 else
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173 log("debug", "Unsupported SASL mechanism: "..tostring(mechanism));
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174 onFail("unsupported-mechanism")
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175 end
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176 return object
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177 end
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178
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179 return _M;