prosody
631e7d16d22b
util/sasl.lua

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util/sasl.lua @ 529:631e7d16d22b

Fix for handling latin1 encoded hostnames in SASL
author Waqas Hussain <waqas20@gmail.com>
date Wed, 03 Dec 2008 22:08:49 +0500
parent 519:cccd610a0ef9
child 595:08ed4fa2f89d
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rev   line source
519
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1 -- sasl.lua v0.1
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2 -- Copyright (C) 2008 Tobias Markmann
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3 --
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4 -- All rights reserved.
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5 --
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6 -- Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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7 --
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8 -- * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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9 -- * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
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10 -- * Neither the name of Tobias Markmann nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
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11 --
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12 -- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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14
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15 local md5 = require "util.hashes".md5;
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16 local log = require "util.logger".init("sasl");
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17 local tostring = tostring;
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18 local st = require "util.stanza";
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19 local generate_uuid = require "util.uuid".generate;
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20 local t_insert, t_concat = table.insert, table.concat;
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21 local to_byte, to_char = string.byte, string.char;
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22 local s_match = string.match;
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23 local gmatch = string.gmatch
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24 local string = string
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25 local math = require "math"
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26 local type = type
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27 local error = error
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28 local print = print
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29 local idna_ascii = require "util.encodings".idna.to_ascii
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30 local idna_unicode = require "util.encodings".idna.to_unicode
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31
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32 module "sasl"
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33
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34 local function new_plain(realm, password_handler)
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35 local object = { mechanism = "PLAIN", realm = realm, password_handler = password_handler}
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36 function object.feed(self, message)
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37
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38 if message == "" or message == nil then return "failure", "malformed-request" end
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39 local response = message
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40 local authorization = s_match(response, "([^&%z]+)")
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41 local authentication = s_match(response, "%z([^&%z]+)%z")
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42 local password = s_match(response, "%z[^&%z]+%z([^&%z]+)")
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43
402
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44 if authentication == nil or password == nil then return "failure", "malformed-request" end
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45
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46 local password_encoding, correct_password = self.password_handler(authentication, self.realm, "PLAIN")
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47
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48 if correct_password == nil then return "failure", "not-authorized"
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49 elseif correct_password == false then return "failure", "account-disabled" end
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51 local claimed_password = ""
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52 if password_encoding == nil then claimed_password = password
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53 else claimed_password = password_encoding(password) end
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54
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55 self.username = authentication
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56 if claimed_password == correct_password then
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57 return "success"
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58 else
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59 return "failure", "not-authorized"
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60 end
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61 end
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62 return object
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63 end
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64
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65 local function new_digest_md5(realm, password_handler)
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66 --TODO maybe support for authzid
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67
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68 local function serialize(message)
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69 local data = ""
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70
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71 if type(message) ~= "table" then error("serialize needs an argument of type table.") end
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72
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73 -- testing all possible values
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74 if message["nonce"] then data = data..[[nonce="]]..message.nonce..[[",]] end
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75 if message["qop"] then data = data..[[qop="]]..message.qop..[[",]] end
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76 if message["charset"] then data = data..[[charset=]]..message.charset.."," end
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77 if message["algorithm"] then data = data..[[algorithm=]]..message.algorithm.."," end
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78 if message["realm"] then data = data..[[realm="]]..message.realm..[[",]] end
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79 if message["rspauth"] then data = data..[[rspauth=]]..message.rspauth.."," 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 latin1toutf8(str)
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85 local p = {};
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86 for ch in gmatch(str, ".") do
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87 ch = to_byte(ch);
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88 if (ch < 0x80) then
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89 t_insert(p, to_char(ch));
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90 elseif (ch < 0xC0) then
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91 t_insert(p, to_char(0xC2, ch));
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92 else
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93 t_insert(p, to_char(0xC3, ch - 64));
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94 end
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95 end
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96 return t_concat(p);
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97 end
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98 local function parse(data)
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99 message = {}
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100 for k, v in gmatch(data, [[([%w%-]+)="?([^",]*)"?,?]]) do -- FIXME The hacky regex makes me shudder
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101 message[k] = v
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102 end
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103 return message
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104 end
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105
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106 local object = { mechanism = "DIGEST-MD5", realm = realm, password_handler = password_handler}
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107
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108 --TODO: something better than math.random would be nice, maybe OpenSSL's random number generator
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109 object.nonce = generate_uuid()
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110 object.step = 0
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111 object.nonce_count = {}
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112
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113 function object.feed(self, message)
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114 self.step = self.step + 1
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115 if (self.step == 1) then
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116 local challenge = serialize({ nonce = object.nonce,
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117 qop = "auth",
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118 charset = "utf-8",
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119 algorithm = "md5-sess",
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120 realm = self.realm});
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121 return "challenge", challenge
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122 elseif (self.step == 2) then
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123 local response = parse(message)
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124 -- check for replay attack
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125 if response["nc"] then
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126 if self.nonce_count[response["nc"]] then return "failure", "not-authorized" end
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127 end
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128
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129 -- check for username, it's REQUIRED by RFC 2831
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130 if not response["username"] then
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131 return "failure", "malformed-request"
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132 end
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133 self["username"] = response["username"]
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134
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135 -- check for nonce, ...
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136 if not response["nonce"] then
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137 return "failure", "malformed-request"
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138 else
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139 -- check if it's the right nonce
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140 if response["nonce"] ~= tostring(self.nonce) then return "failure", "malformed-request" end
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141 end
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142
297
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143 if not response["cnonce"] then return "failure", "malformed-request", "Missing entry for cnonce in SASL message." end
294
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144 if not response["qop"] then response["qop"] = "auth" end
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145
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146 if response["realm"] == nil then response["realm"] = "" end
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147 local raw_realm = response["realm"];
294
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148
508
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149 if response["charset"] == nil then
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150 response["username"] = latin1toutf8(response["username"])
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151 response["realm"] = latin1toutf8(response["realm"])
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152 elseif response["charset"] ~= "utf-8" then
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153 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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154 end
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155
294
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156 local domain = ""
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157 local protocol = ""
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158 if response["digest-uri"] then
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159 protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$")
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160 if protocol == nil or domain == nil then return "failure", "malformed-request" end
294
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161 else
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162 return "failure", "malformed-request", "Missing entry for digest-uri in SASL message."
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163 end
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164
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165 --TODO maybe realm support
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166 self.username = response["username"]
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167 local password_encoding, Y = self.password_handler(response["username"], response["realm"], "DIGEST-MD5", raw_realm)
405
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168 if Y == nil then return "failure", "not-authorized"
404
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169 elseif Y == false then return "failure", "account-disabled" end
402
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170
294
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171 local A1 = Y..":"..response["nonce"]..":"..response["cnonce"]--:authzid
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172 local A2 = "AUTHENTICATE:"..protocol.."/"..idna_ascii(domain)
294
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173
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174 local HA1 = md5(A1, true)
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175 local HA2 = md5(A2, true)
294
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176
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177 local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
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178 local response_value = md5(KD, true)
294
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179
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180 if response_value == response["response"] then
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181 -- calculate rspauth
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182 A2 = ":"..protocol.."/"..idna_ascii(domain)
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183
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184 HA1 = md5(A1, true)
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185 HA2 = md5(A2, true)
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186
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187 KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
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188 local rspauth = md5(KD, true)
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189 self.authenticated = true
294
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190 return "challenge", serialize({rspauth = rspauth})
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191 else
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192 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated."
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193 end
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194 elseif self.step == 3 then
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195 if self.authenticated ~= nil then return "success"
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196 else return "failure", "malformed-request" end
294
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197 end
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198 end
276
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199 return object
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200 end
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201
294
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202 function new(mechanism, realm, password_handler)
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203 local object
294
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204 if mechanism == "PLAIN" then object = new_plain(realm, password_handler)
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205 elseif mechanism == "DIGEST-MD5" then object = new_digest_md5(realm, password_handler)
38
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206 else
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207 log("debug", "Unsupported SASL mechanism: "..tostring(mechanism));
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208 return nil
15
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209 end
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210 return object
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211 end
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212
519
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diff changeset
213 return _M;