prosody
0112ae30f399
util/sasl.lua

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util/sasl.lua @ 883:0112ae30f399

Support to filter logging by source via pattern matching from config file.
author Tobias Markmann <tm@ayena.de>
date Sat, 07 Mar 2009 20:33:21 +0100
parent 801:d29febc977fc
child 896:2c0b9e3c11c3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
799
b7ea802f3527 Adding inital support for ANONYMOUS mechanism in SASL.
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1 -- sasl.lua v0.3
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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;
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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
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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
595
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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
276
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131 local function parse(data)
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132 message = {}
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133 for k, v in gmatch(data, [[([%w%-]+)="?([^",]*)"?,?]]) do -- FIXME The hacky regex makes me shudder
276
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134 message[k] = v
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135 end
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136 return message
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137 end
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138
294
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139 local object = { mechanism = "DIGEST-MD5", realm = realm, password_handler = password_handler}
276
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140
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diff changeset
141 --TODO: something better than math.random would be nice, maybe OpenSSL's random number generator
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.
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diff changeset
142 object.nonce = generate_uuid()
294
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diff changeset
143 object.step = 0
276
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144 object.nonce_count = {}
294
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145
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146 function object.feed(self, message)
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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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1b938e00412c Remove that idn stuff for realm because it's either an ugly hack that the password_handler isn't ready for or something worse.
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diff changeset
153 realm = self.realm});
294
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154 return "challenge", challenge
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155 elseif (self.step == 2) then
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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
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164 return "failure", "malformed-request"
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165 end
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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
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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
297
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diff changeset
176 if not response["cnonce"] then return "failure", "malformed-request", "Missing entry for cnonce in SASL message." end
294
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177 if not response["qop"] then response["qop"] = "auth" end
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178
702
d344860fdada 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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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
602
a977227aa9e6 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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182 return "failure", "not-authorized", "Incorrect realm value";
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diff changeset
183 end
685
55d1bc45acf1 sasl: Don't fail for realm=""
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diff changeset
184
599
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185 local decoder;
508
4fd60ae97535 Converting latin encoded responsed to utf-8 when needed.
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parents: 507
diff changeset
186 if response["charset"] == nil then
599
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diff changeset
187 decoder = utf8tolatin1ifpossible;
508
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diff changeset
188 elseif response["charset"] ~= "utf-8" then
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diff changeset
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."
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diff changeset
190 end
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191
294
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192 local domain = ""
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193 local protocol = ""
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194 if response["digest-uri"] then
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diff changeset
195 protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$")
402
50f1c09541cd Checking some variables for nil so no errors occur that'll break the server.
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diff changeset
196 if protocol == nil or domain == nil then return "failure", "malformed-request" end
294
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diff changeset
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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diff changeset
201 --TODO maybe realm support
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diff changeset
202 self.username = response["username"]
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diff changeset
203 local password_encoding, Y = self.password_handler(response["username"], response["realm"], "DIGEST-MD5", decoder)
405
62706c4e04cf Some ends too much.
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parents: 404
diff changeset
204 if Y == nil then return "failure", "not-authorized"
404
4801dbeccc2a Some changes to report more correct SASL failures. Support for disabled accounts.
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parents: 402
diff changeset
205 elseif Y == false then return "failure", "account-disabled" end
402
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diff changeset
206
294
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diff changeset
207 local A1 = Y..":"..response["nonce"]..":"..response["cnonce"]--:authzid
603
423fd24fff54 Removed the unnecessary idna.to_ascii applied to the DIGEST-MD5 disgest-uri response values, which was causing auth failures with some clients.
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parents: 602
diff changeset
208 local A2 = "AUTHENTICATE:"..protocol.."/"..domain;
294
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diff changeset
209
449
c0a4a1e63d70 Completely switched to new hashes library from the old md5 library
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diff changeset
210 local HA1 = md5(A1, true)
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diff changeset
211 local HA2 = md5(A2, true)
294
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diff changeset
212
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diff changeset
213 local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
449
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parents: 405
diff changeset
214 local response_value = md5(KD, true)
294
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diff changeset
215
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diff changeset
216 if response_value == response["response"] then
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diff changeset
217 -- calculate rspauth
603
423fd24fff54 Removed the unnecessary idna.to_ascii applied to the DIGEST-MD5 disgest-uri response values, which was causing auth failures with some clients.
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parents: 602
diff changeset
218 A2 = ":"..protocol.."/"..domain;
294
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diff changeset
219
449
c0a4a1e63d70 Completely switched to new hashes library from the old md5 library
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parents: 405
diff changeset
220 HA1 = md5(A1, true)
c0a4a1e63d70 Completely switched to new hashes library from the old md5 library
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parents: 405
diff changeset
221 HA2 = md5(A2, true)
294
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diff changeset
222
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diff changeset
223 KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
449
c0a4a1e63d70 Completely switched to new hashes library from the old md5 library
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parents: 405
diff changeset
224 local rspauth = md5(KD, true)
297
15b375870b40 Providing some human readable error messages and some fixes.
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parents: 294
diff changeset
225 self.authenticated = true
294
5d861d6e5bbd Made SASL module fit the new interface.
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parents: 292
diff changeset
226 return "challenge", serialize({rspauth = rspauth})
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diff changeset
227 else
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diff changeset
228 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated."
5d861d6e5bbd Made SASL module fit the new interface.
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diff changeset
229 end
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parents: 292
diff changeset
230 elseif self.step == 3 then
297
15b375870b40 Providing some human readable error messages and some fixes.
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parents: 294
diff changeset
231 if self.authenticated ~= nil then return "success"
15b375870b40 Providing some human readable error messages and some fixes.
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parents: 294
diff changeset
232 else return "failure", "malformed-request" end
294
5d861d6e5bbd Made SASL module fit the new interface.
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diff changeset
233 end
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parents: 292
diff changeset
234 end
276
30893439d5d1 Some early attempts on DIGEST-MD5.
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diff changeset
235 return object
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diff changeset
236 end
30893439d5d1 Some early attempts on DIGEST-MD5.
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parents: 50
diff changeset
237
799
b7ea802f3527 Adding inital support for ANONYMOUS mechanism in SASL.
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parents: 760
diff changeset
238 local function new_anonymous(realm, password_handler)
b7ea802f3527 Adding inital support for ANONYMOUS mechanism in SASL.
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parents: 760
diff changeset
239 local object = { mechanism = "ANONYMOUS", realm = realm, password_handler = password_handler}
b7ea802f3527 Adding inital support for ANONYMOUS mechanism in SASL.
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diff changeset
240 function object.feed(self, message)
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diff changeset
241 return "success"
b7ea802f3527 Adding inital support for ANONYMOUS mechanism in SASL.
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diff changeset
242 end
801
d29febc977fc Adding TODO notice on UUIDs for usage with SASL ANONYMOUS.
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parents: 799
diff changeset
243 --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.
799
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diff changeset
244 object["username"] = generate_uuid()
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parents: 760
diff changeset
245 return object
b7ea802f3527 Adding inital support for ANONYMOUS mechanism in SASL.
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parents: 760
diff changeset
246 end
b7ea802f3527 Adding inital support for ANONYMOUS mechanism in SASL.
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parents: 760
diff changeset
247
b7ea802f3527 Adding inital support for ANONYMOUS mechanism in SASL.
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diff changeset
248
294
5d861d6e5bbd Made SASL module fit the new interface.
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diff changeset
249 function new(mechanism, realm, password_handler)
15
c0d754774db2 adding SASL lib with PLAIN support, not tested yet
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parents:
diff changeset
250 local object
294
5d861d6e5bbd Made SASL module fit the new interface.
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parents: 292
diff changeset
251 if mechanism == "PLAIN" then object = new_plain(realm, password_handler)
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parents: 292
diff changeset
252 elseif mechanism == "DIGEST-MD5" then object = new_digest_md5(realm, password_handler)
799
b7ea802f3527 Adding inital support for ANONYMOUS mechanism in SASL.
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parents: 760
diff changeset
253 elseif mechanism == "ANONYMOUS" then object = new_anonymous(realm, password_handler)
38
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parents: 32
diff changeset
254 else
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parents: 32
diff changeset
255 log("debug", "Unsupported SASL mechanism: "..tostring(mechanism));
285
372d0891e8fd Made PLAIN method in sasl.lua module follow new interface.
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parents: 280
diff changeset
256 return nil
15
c0d754774db2 adding SASL lib with PLAIN support, not tested yet
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parents:
diff changeset
257 end
c0d754774db2 adding SASL lib with PLAIN support, not tested yet
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parents:
diff changeset
258 return object
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parents:
diff changeset
259 end
c0d754774db2 adding SASL lib with PLAIN support, not tested yet
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parents:
diff changeset
260
519
cccd610a0ef9 Insert copyright/license headers
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parents: 508
diff changeset
261 return _M;