prosody
c0da9e7b0447
util/sasl.lua

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util/sasl.lua @ 2345:c0da9e7b0447

Merge with 0.6
author Matthew Wild <mwild1@gmail.com>
date Wed, 09 Dec 2009 13:20:46 +0000
parent 2254:f966c8699f5b
child 2735:65bbc4b67733
child 2991:0fa3a7c885bd
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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;
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16 local log = require "util.logger".init("sasl");
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17 local st = require "util.stanza";
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18 local set = require "util.set";
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19 local array = require "util.array";
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20 local to_unicode = require "util.encodings".idna.to_unicode;
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21
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22 local tostring = tostring;
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23 local pairs, ipairs = pairs, ipairs;
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24 local t_insert, t_concat = table.insert, table.concat;
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25 local s_match = string.match;
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26 local type = type
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27 local error = error
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28 local setmetatable = setmetatable;
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29 local assert = assert;
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30 local require = require;
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31
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32 require "util.iterators"
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33 local keys = keys
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34
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35 local array = require "util.array"
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36 module "sasl"
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37
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38 --[[
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39 Authentication Backend Prototypes:
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40
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41 state = false : disabled
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42 state = true : enabled
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43 state = nil : non-existant
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44
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45 plain:
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46 function(username, realm)
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47 return password, state;
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48 end
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49
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50 plain-test:
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51 function(username, realm, password)
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52 return true or false, state;
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53 end
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54
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55 digest-md5:
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56 function(username, domain, realm, encoding) -- domain and realm are usually the same; for some broken
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57 -- implementations it's not
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58 return digesthash, state;
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59 end
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60
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61 digest-md5-test:
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62 function(username, domain, realm, encoding, digesthash)
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63 return true or false, state;
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64 end
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65 ]]
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66
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67 local method = {};
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68 method.__index = method;
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69 local mechanisms = {};
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70 local backend_mechanism = {};
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71
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72 -- register a new SASL mechanims
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73 local function registerMechanism(name, backends, f)
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74 assert(type(name) == "string", "Parameter name MUST be a string.");
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75 assert(type(backends) == "string" or type(backends) == "table", "Parameter backends MUST be either a string or a table.");
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76 assert(type(f) == "function", "Parameter f MUST be a function.");
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77 mechanisms[name] = f
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78 for _, backend_name in ipairs(backends) do
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79 if backend_mechanism[backend_name] == nil then backend_mechanism[backend_name] = {}; end
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80 t_insert(backend_mechanism[backend_name], name);
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81 end
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82 end
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83
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84 -- create a new SASL object which can be used to authenticate clients
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85 function new(realm, profile, forbidden)
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86 local sasl_i = {profile = profile};
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87 sasl_i.realm = realm;
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88 local s = setmetatable(sasl_i, method);
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89 if forbidden == nil then forbidden = {} end
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90 s:forbidden(forbidden)
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91 return s;
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92 end
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93
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94 -- get a fresh clone with the same realm, profiles and forbidden mechanisms
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95 function method:clean_clone()
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96 return new(self.realm, self.profile, self:forbidden())
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97 end
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98
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99 -- set the forbidden mechanisms
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100 function method:forbidden( restrict )
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101 if restrict then
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102 -- set forbidden
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103 self.restrict = set.new(restrict);
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104 else
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105 -- get forbidden
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106 return array.collect(self.restrict:items());
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107 end
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108 end
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109
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110 -- get a list of possible SASL mechanims to use
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111 function method:mechanisms()
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112 local mechanisms = {}
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113 for backend, f in pairs(self.profile) do
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114 if backend_mechanism[backend] then
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115 for _, mechanism in ipairs(backend_mechanism[backend]) do
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116 if not self.restrict:contains(mechanism) then
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117 mechanisms[mechanism] = true;
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118 end
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119 end
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120 end
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121 end
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122 self["possible_mechanisms"] = mechanisms;
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123 return array.collect(keys(mechanisms));
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124 end
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125
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126 -- select a mechanism to use
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127 function method:select(mechanism)
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128 if self.mech_i then
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129 return false;
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130 end
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131
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132 self.mech_i = mechanisms[mechanism]
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133 if self.mech_i == nil then
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134 return false;
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135 end
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136 return true;
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137 end
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138
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139 -- feed new messages to process into the library
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140 function method:process(message)
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141 --if message == "" or message == nil then return "failure", "malformed-request" end
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142 return self.mech_i(self, message);
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143 end
799
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144
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145 -- load the mechanisms
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146 load_mechs = {"plain", "digest-md5", "anonymous", "scram"}
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147 for _, mech in ipairs(load_mechs) do
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148 local name = "util.sasl."..mech;
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149 local m = require(name);
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150 m.init(registerMechanism)
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151 end
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152
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cccd610a0ef9 Insert copyright/license headers
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153 return _M;