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util/sasl.lua @ 1217:844ef764ef0e
mod_saslauth: Don't offer bind/session when they aren't authenticated yet :) [thanks albert, again...]
| author | Matthew Wild <mwild1@gmail.com> |
|---|---|
| date | Fri, 29 May 2009 18:03:48 +0100 |
| parent | 1161:5bc2b7b5b81d |
| child | 1305:37657578ea85 |
| rev | line source |
|---|---|
| 896 | 1 -- sasl.lua v0.4 |
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2 -- Copyright (C) 2008-2009 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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13 |
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14 |
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15 local md5 = require "util.hashes".md5; |
| 38 | 16 local log = require "util.logger".init("sasl"); |
| 17 local tostring = tostring; | |
| 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; |
| 38 | 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 |
| 38 | 30 module "sasl" |
| 31 | |
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32 local function new_plain(realm, password_handler) |
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33 local object = { mechanism = "PLAIN", realm = realm, password_handler = password_handler} |
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34 function object.feed(self, message) |
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35 |
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36 if message == "" or message == nil then return "failure", "malformed-request" end |
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37 local response = message |
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38 local authorization = s_match(response, "([^&%z]+)") |
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39 local authentication = s_match(response, "%z([^&%z]+)%z") |
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40 local password = s_match(response, "%z[^&%z]+%z([^&%z]+)") |
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41 |
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42 if authentication == nil or password == nil then return "failure", "malformed-request" end |
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43 |
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44 local password_encoding, correct_password = self.password_handler(authentication, self.realm, "PLAIN") |
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45 |
| 405 | 46 if correct_password == nil then return "failure", "not-authorized" |
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47 elseif correct_password == false then return "failure", "account-disabled" end |
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48 |
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49 local claimed_password = "" |
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50 if password_encoding == nil then claimed_password = password |
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51 else claimed_password = password_encoding(password) end |
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52 |
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53 self.username = authentication |
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54 if claimed_password == correct_password then |
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55 return "success" |
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56 else |
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57 return "failure", "not-authorized" |
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58 end |
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59 end |
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60 return object |
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61 end |
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62 |
| 1158 | 63 |
| 64 -- implementing RFC 2831 | |
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65 local function new_digest_md5(realm, password_handler) |
| 1158 | 66 --TODO complete 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 utf8tolatin1ifpossible(passwd) |
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85 local i = 1; |
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86 while i <= #passwd do |
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87 local passwd_i = to_byte(passwd:sub(i, i)); |
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88 if passwd_i > 0x7F then |
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89 if passwd_i < 0xC0 or passwd_i > 0xC3 then |
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90 return passwd; |
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91 end |
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92 i = i + 1; |
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93 passwd_i = to_byte(passwd:sub(i, i)); |
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94 if passwd_i < 0x80 or passwd_i > 0xBF then |
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95 return passwd; |
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96 end |
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97 end |
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98 i = i + 1; |
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99 end |
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100 |
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101 local p = {}; |
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102 local j = 0; |
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103 i = 1; |
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104 while (i <= #passwd) do |
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105 local passwd_i = to_byte(passwd:sub(i, i)); |
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106 if passwd_i > 0x7F then |
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107 i = i + 1; |
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108 local passwd_i_1 = to_byte(passwd:sub(i, i)); |
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109 t_insert(p, to_char(passwd_i%4*64 + passwd_i_1%64)); -- I'm so clever |
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110 else |
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111 t_insert(p, to_char(passwd_i)); |
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112 end |
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113 i = i + 1; |
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114 end |
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115 return t_concat(p); |
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116 end |
|
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117 local function latin1toutf8(str) |
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118 local p = {}; |
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119 for ch in gmatch(str, ".") do |
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120 ch = to_byte(ch); |
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121 if (ch < 0x80) then |
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122 t_insert(p, to_char(ch)); |
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123 elseif (ch < 0xC0) then |
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124 t_insert(p, to_char(0xC2, ch)); |
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125 else |
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126 t_insert(p, to_char(0xC3, ch - 64)); |
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127 end |
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128 end |
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129 return t_concat(p); |
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130 end |
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131 local function parse(data) |
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132 message = {} |
| 458 | 133 for k, v in gmatch(data, [[([%w%-]+)="?([^",]*)"?,?]]) do -- FIXME The hacky regex makes me shudder |
| 1160 | 134 message[k] = v; |
|
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135 end |
| 1160 | 136 return message; |
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137 end |
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138 |
| 1160 | 139 local object = { mechanism = "DIGEST-MD5", realm = realm, password_handler = password_handler}; |
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140 |
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141 --TODO: something better than math.random would be nice, maybe OpenSSL's random number generator |
| 1160 | 142 object.nonce = generate_uuid(); |
| 143 object.step = 0; | |
| 144 object.nonce_count = {}; | |
|
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145 |
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146 function object.feed(self, message) |
| 1160 | 147 self.step = self.step + 1; |
|
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148 if (self.step == 1) then |
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149 local challenge = serialize({ nonce = object.nonce, |
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150 qop = "auth", |
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151 charset = "utf-8", |
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152 algorithm = "md5-sess", |
|
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153 realm = self.realm}); |
| 1160 | 154 return "challenge", challenge; |
|
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155 elseif (self.step == 2) then |
| 1160 | 156 local response = parse(message); |
|
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157 -- check for replay attack |
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158 if response["nc"] then |
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159 if self.nonce_count[response["nc"]] then return "failure", "not-authorized" end |
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160 end |
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161 |
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162 -- check for username, it's REQUIRED by RFC 2831 |
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163 if not response["username"] then |
| 1160 | 164 return "failure", "malformed-request"; |
|
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165 end |
| 1160 | 166 self["username"] = response["username"]; |
|
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167 |
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168 -- check for nonce, ... |
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169 if not response["nonce"] then |
| 1160 | 170 return "failure", "malformed-request"; |
|
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171 else |
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172 -- check if it's the right nonce |
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173 if response["nonce"] ~= tostring(self.nonce) then return "failure", "malformed-request" end |
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174 end |
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175 |
|
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176 if not response["cnonce"] then return "failure", "malformed-request", "Missing entry for cnonce in SASL message." end |
|
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177 if not response["qop"] then response["qop"] = "auth" end |
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178 |
|
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179 if response["realm"] == nil or response["realm"] == "" then |
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180 response["realm"] = self.realm; |
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181 elseif response["realm"] ~= self.realm then |
|
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182 return "failure", "not-authorized", "Incorrect realm value"; |
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183 end |
|
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184 |
|
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185 local decoder; |
|
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186 if response["charset"] == nil then |
|
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187 decoder = utf8tolatin1ifpossible; |
|
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188 elseif response["charset"] ~= "utf-8" then |
| 1160 | 189 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."; |
|
508
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190 end |
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191 |
| 1160 | 192 local domain = ""; |
| 193 local protocol = ""; | |
|
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194 if response["digest-uri"] then |
| 1160 | 195 protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$"); |
|
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196 if protocol == nil or domain == nil then return "failure", "malformed-request" end |
|
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197 else |
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198 return "failure", "malformed-request", "Missing entry for digest-uri in SASL message." |
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199 end |
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200 |
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201 --TODO maybe realm support |
| 1160 | 202 self.username = response["username"]; |
|
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203 local password_encoding, Y = self.password_handler(response["username"], response["realm"], "DIGEST-MD5", decoder) |
| 405 | 204 if Y == nil then return "failure", "not-authorized" |
|
404
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205 elseif Y == false then return "failure", "account-disabled" end |
|
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206 local A1 = ""; |
|
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207 if response.authzid then |
|
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208 if response.authzid == self.username.."@"..self.realm then |
| 1161 | 209 log("warn", "Client is violating XMPP RFC. See section 6.1 of RFC 3920."); |
|
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210 A1 = Y..":"..response["nonce"]..":"..response["cnonce"]..":"..response.authzid; |
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211 else |
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212 A1 = "?"; |
|
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213 end |
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214 else |
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215 A1 = Y..":"..response["nonce"]..":"..response["cnonce"]; |
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216 end |
|
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217 local A2 = "AUTHENTICATE:"..protocol.."/"..domain; |
|
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218 |
| 1160 | 219 local HA1 = md5(A1, true); |
| 220 local HA2 = md5(A2, true); | |
|
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221 |
| 1160 | 222 local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2; |
| 223 local response_value = md5(KD, true); | |
|
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224 |
|
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225 if response_value == response["response"] then |
|
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226 -- calculate rspauth |
|
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227 A2 = ":"..protocol.."/"..domain; |
|
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228 |
| 1160 | 229 HA1 = md5(A1, true); |
| 230 HA2 = md5(A2, true); | |
|
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231 |
|
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232 KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2 |
| 1160 | 233 local rspauth = md5(KD, true); |
| 234 self.authenticated = true; | |
| 235 return "challenge", serialize({rspauth = rspauth}); | |
|
294
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236 else |
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237 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated." |
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238 end |
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239 elseif self.step == 3 then |
|
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240 if self.authenticated ~= nil then return "success" |
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241 else return "failure", "malformed-request" end |
|
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242 end |
|
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243 end |
| 1160 | 244 return object; |
|
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245 end |
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246 |
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247 local function new_anonymous(realm, password_handler) |
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248 local object = { mechanism = "ANONYMOUS", realm = realm, password_handler = password_handler} |
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249 function object.feed(self, message) |
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250 return "success" |
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251 end |
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Adding TODO notice on UUIDs for usage with SASL ANONYMOUS.
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252 --TODO: From XEP-0175 "It is RECOMMENDED for the node identifier to be a UUID as specified in RFC 4122 [5]." So util.uuid() should (or have an option to) behave as specified in RFC 4122. |
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253 object["username"] = generate_uuid() |
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254 return object |
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255 end |
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256 |
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257 |
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258 function new(mechanism, realm, password_handler) |
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259 local object |
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260 if mechanism == "PLAIN" then object = new_plain(realm, password_handler) |
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261 elseif mechanism == "DIGEST-MD5" then object = new_digest_md5(realm, password_handler) |
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262 elseif mechanism == "ANONYMOUS" then object = new_anonymous(realm, password_handler) |
| 38 | 263 else |
| 264 log("debug", "Unsupported SASL mechanism: "..tostring(mechanism)); | |
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265 return nil |
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266 end |
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267 return object |
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268 end |
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269 |
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Insert copyright/license headers
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270 return _M; |
