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util/sasl.lua @ 1767:649dd3439809
MUC: Discard non-persistent rooms as soon as they become empty.
| author | Waqas Hussain <waqas20@gmail.com> |
|---|---|
| date | Wed, 09 Sep 2009 19:28:36 +0500 |
| parent | 1725:fb3137652ea6 |
| child | 2078:a5f154548154 |
| 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; |
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22 local to_unicode = require "util.encodings".idna.to_unicode; |
| 38 | 23 local s_match = string.match; |
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24 local gmatch = string.gmatch |
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25 local string = string |
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26 local math = require "math" |
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27 local type = type |
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28 local error = error |
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29 local print = print |
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30 |
| 38 | 31 module "sasl" |
| 32 | |
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33 -- Credentials handler: |
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34 -- Arguments: ("PLAIN", user, host, password) |
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35 -- Returns: true (success) | false (fail) | nil (user unknown) |
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36 local function new_plain(realm, credentials_handler) |
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37 local object = { mechanism = "PLAIN", realm = realm, credentials_handler = credentials_handler} |
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38 function object.feed(self, message) |
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39 if message == "" or message == nil then return "failure", "malformed-request" end |
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40 local response = message |
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41 local authorization = s_match(response, "([^%z]+)") |
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42 local authentication = s_match(response, "%z([^%z]+)%z") |
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43 local password = s_match(response, "%z[^%z]+%z([^%z]+)") |
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44 |
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45 if authentication == nil or password == nil then return "failure", "malformed-request" end |
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46 self.username = authentication |
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47 local auth_success = self.credentials_handler("PLAIN", self.username, self.realm, password) |
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48 |
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49 if auth_success then |
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50 return "success" |
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51 elseif auth_success == nil then |
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52 return "failure", "account-disabled" |
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53 else |
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54 return "failure", "not-authorized" |
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55 end |
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56 end |
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57 return object |
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58 end |
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59 |
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60 -- credentials_handler: |
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61 -- Arguments: (mechanism, node, domain, realm, decoder) |
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62 -- Returns: Password encoding, (plaintext) password |
| 1158 | 63 -- implementing RFC 2831 |
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64 local function new_digest_md5(realm, credentials_handler) |
| 1158 | 65 --TODO complete support for authzid |
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66 |
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67 local function serialize(message) |
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68 local data = "" |
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69 |
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70 if type(message) ~= "table" then error("serialize needs an argument of type table.") end |
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71 |
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72 -- testing all possible values |
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73 if message["realm"] then data = data..[[realm="]]..message.realm..[[",]] end |
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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["rspauth"] then data = data..[[rspauth=]]..message.rspauth.."," end |
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79 data = data:gsub(",$", "") |
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80 return data |
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81 end |
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82 |
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83 local function utf8tolatin1ifpossible(passwd) |
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84 local i = 1; |
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85 while i <= #passwd do |
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86 local passwd_i = to_byte(passwd:sub(i, i)); |
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87 if passwd_i > 0x7F then |
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88 if passwd_i < 0xC0 or passwd_i > 0xC3 then |
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89 return passwd; |
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90 end |
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91 i = i + 1; |
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92 passwd_i = to_byte(passwd:sub(i, i)); |
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93 if passwd_i < 0x80 or passwd_i > 0xBF then |
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94 return passwd; |
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95 end |
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96 end |
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97 i = i + 1; |
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98 end |
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99 |
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100 local p = {}; |
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101 local j = 0; |
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102 i = 1; |
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103 while (i <= #passwd) do |
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104 local passwd_i = to_byte(passwd:sub(i, i)); |
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105 if passwd_i > 0x7F then |
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106 i = i + 1; |
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107 local passwd_i_1 = to_byte(passwd:sub(i, i)); |
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108 t_insert(p, to_char(passwd_i%4*64 + passwd_i_1%64)); -- I'm so clever |
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109 else |
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110 t_insert(p, to_char(passwd_i)); |
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111 end |
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112 i = i + 1; |
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113 end |
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114 return t_concat(p); |
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115 end |
|
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116 local function latin1toutf8(str) |
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117 local p = {}; |
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118 for ch in gmatch(str, ".") do |
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119 ch = to_byte(ch); |
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120 if (ch < 0x80) then |
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121 t_insert(p, to_char(ch)); |
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122 elseif (ch < 0xC0) then |
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123 t_insert(p, to_char(0xC2, ch)); |
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124 else |
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125 t_insert(p, to_char(0xC3, ch - 64)); |
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126 end |
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127 end |
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128 return t_concat(p); |
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129 end |
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130 local function parse(data) |
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131 local message = {} |
| 458 | 132 for k, v in gmatch(data, [[([%w%-]+)="?([^",]*)"?,?]]) do -- FIXME The hacky regex makes me shudder |
| 1160 | 133 message[k] = v; |
|
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134 end |
| 1160 | 135 return message; |
|
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136 end |
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137 |
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138 local object = { mechanism = "DIGEST-MD5", realm = realm, credentials_handler = credentials_handler}; |
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139 |
| 1160 | 140 object.nonce = generate_uuid(); |
| 141 object.step = 0; | |
| 142 object.nonce_count = {}; | |
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143 |
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144 function object.feed(self, message) |
| 1160 | 145 self.step = self.step + 1; |
|
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146 if (self.step == 1) then |
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147 local challenge = serialize({ nonce = object.nonce, |
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148 qop = "auth", |
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149 charset = "utf-8", |
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150 algorithm = "md5-sess", |
|
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151 realm = self.realm}); |
| 1160 | 152 return "challenge", challenge; |
|
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153 elseif (self.step == 2) then |
| 1160 | 154 local response = parse(message); |
|
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155 -- check for replay attack |
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156 if response["nc"] then |
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157 if self.nonce_count[response["nc"]] then return "failure", "not-authorized" end |
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158 end |
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159 |
|
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160 -- check for username, it's REQUIRED by RFC 2831 |
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161 if not response["username"] then |
| 1160 | 162 return "failure", "malformed-request"; |
|
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163 end |
| 1160 | 164 self["username"] = response["username"]; |
|
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165 |
|
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166 -- check for nonce, ... |
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167 if not response["nonce"] then |
| 1160 | 168 return "failure", "malformed-request"; |
|
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169 else |
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170 -- check if it's the right nonce |
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171 if response["nonce"] ~= tostring(self.nonce) then return "failure", "malformed-request" end |
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172 end |
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173 |
|
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174 if not response["cnonce"] then return "failure", "malformed-request", "Missing entry for cnonce in SASL message." end |
|
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175 if not response["qop"] then response["qop"] = "auth" end |
|
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176 |
|
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sasl: Set realm to be the current realm when the client didn't send a realm, or sent an empty one
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177 if response["realm"] == nil or response["realm"] == "" then |
|
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178 response["realm"] = ""; |
|
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179 elseif response["realm"] ~= self.realm then |
|
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Return error when the given realm value does not match the sent realm value. Prevents impersonation of an account on one virtual host, but a user with the same username on another host.
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180 return "failure", "not-authorized", "Incorrect realm value"; |
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181 end |
|
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182 |
|
599
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183 local decoder; |
|
508
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184 if response["charset"] == nil then |
|
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185 decoder = utf8tolatin1ifpossible; |
|
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186 elseif response["charset"] ~= "utf-8" then |
| 1160 | 187 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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188 end |
|
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189 |
| 1160 | 190 local domain = ""; |
| 191 local protocol = ""; | |
|
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192 if response["digest-uri"] then |
| 1160 | 193 protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$"); |
|
402
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194 if protocol == nil or domain == nil then return "failure", "malformed-request" end |
|
294
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195 else |
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196 return "failure", "malformed-request", "Missing entry for digest-uri in SASL message." |
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197 end |
|
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198 |
|
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199 --TODO maybe realm support |
| 1160 | 200 self.username = response["username"]; |
|
1656
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Fixing a SASL issue by always passing the realm from SASL framework init to the handlers.
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201 local password_encoding, Y = self.credentials_handler("DIGEST-MD5", response["username"], self.realm, response["realm"], decoder); |
| 405 | 202 if Y == nil then return "failure", "not-authorized" |
|
404
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Some changes to report more correct SASL failures. Support for disabled accounts.
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203 elseif Y == false then return "failure", "account-disabled" end |
|
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204 local A1 = ""; |
|
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205 if response.authzid then |
|
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206 if response.authzid == self.username.."@"..self.realm then |
| 1374 | 207 -- COMPAT |
| 1161 | 208 log("warn", "Client is violating XMPP RFC. See section 6.1 of RFC 3920."); |
|
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209 A1 = Y..":"..response["nonce"]..":"..response["cnonce"]..":"..response.authzid; |
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210 else |
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211 A1 = "?"; |
|
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212 end |
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213 else |
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214 A1 = Y..":"..response["nonce"]..":"..response["cnonce"]; |
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215 end |
|
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|
216 local A2 = "AUTHENTICATE:"..protocol.."/"..domain; |
|
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217 |
| 1160 | 218 local HA1 = md5(A1, true); |
| 219 local HA2 = md5(A2, true); | |
|
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220 |
| 1160 | 221 local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2; |
| 222 local response_value = md5(KD, true); | |
|
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223 |
|
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224 if response_value == response["response"] then |
|
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225 -- calculate rspauth |
|
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226 A2 = ":"..protocol.."/"..domain; |
|
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227 |
| 1160 | 228 HA1 = md5(A1, true); |
| 229 HA2 = md5(A2, true); | |
|
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230 |
|
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231 KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2 |
| 1160 | 232 local rspauth = md5(KD, true); |
| 233 self.authenticated = true; | |
| 234 return "challenge", serialize({rspauth = rspauth}); | |
|
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235 else |
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236 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated." |
|
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237 end |
|
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238 elseif self.step == 3 then |
|
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239 if self.authenticated ~= nil then return "success" |
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240 else return "failure", "malformed-request" end |
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294
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241 end |
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242 end |
| 1160 | 243 return object; |
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276
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244 end |
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245 |
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246 -- Credentials handler: Can be nil. If specified, should take the mechanism as |
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247 -- the only argument, and return true for OK, or false for not-OK (TODO) |
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248 local function new_anonymous(realm, credentials_handler) |
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249 local object = { mechanism = "ANONYMOUS", realm = realm, credentials_handler = credentials_handler} |
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250 function object.feed(self, message) |
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251 return "success" |
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252 end |
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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, credentials_handler) |
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259 local object |
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260 if mechanism == "PLAIN" then object = new_plain(realm, credentials_handler) |
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261 elseif mechanism == "DIGEST-MD5" then object = new_digest_md5(realm, credentials_handler) |
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262 elseif mechanism == "ANONYMOUS" then object = new_anonymous(realm, credentials_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; |
