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618ab9bba1c2
util/sasl.lua

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util/sasl.lua @ 11366:618ab9bba1c2

util.cache: Add test for :table (fails on Lua 5.1)
author Kim Alvefur <zash@zash.se>
date Fri, 05 Feb 2021 16:14:06 +0100
parent 10723:144a1ee24a4e
child 11727:f3aee8a825cc
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rev   line source
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2c0b9e3c11c3 0.3->0.4
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1 -- sasl.lua v0.4
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2 -- Copyright (C) 2008-2010 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 pairs, ipairs = pairs, ipairs;
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16 local t_insert = table.insert;
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17 local type = type
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18 local setmetatable = setmetatable;
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19 local assert = assert;
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20 local require = require;
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21
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22 local _ENV = nil;
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23 -- luacheck: std none
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24
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25 --[[
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26 Authentication Backend Prototypes:
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27
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28 state = false : disabled
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29 state = true : enabled
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30 state = nil : non-existant
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31
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32 Channel Binding:
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33
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34 To enable support of channel binding in some mechanisms you need to provide appropriate callbacks in a table
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35 at profile.cb.
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36
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37 Example:
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38 profile.cb["tls-unique"] = function(self)
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39 return self.user
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40 end
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41
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42 ]]
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43
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44 local method = {};
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45 method.__index = method;
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46 local registered_mechanisms = {};
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47 local backend_mechanism = {};
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48 local mechanism_channelbindings = {};
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49
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50 -- register a new SASL mechanims
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51 local function registerMechanism(name, backends, f, cb_backends)
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52 assert(type(name) == "string", "Parameter name MUST be a string.");
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53 assert(type(backends) == "string" or type(backends) == "table", "Parameter backends MUST be either a string or a table.");
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54 assert(type(f) == "function", "Parameter f MUST be a function.");
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55 if cb_backends then assert(type(cb_backends) == "table"); end
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56 registered_mechanisms[name] = f
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57 if cb_backends then
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58 mechanism_channelbindings[name] = {};
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59 for _, cb_name in ipairs(cb_backends) do
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60 mechanism_channelbindings[name][cb_name] = true;
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61 end
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62 end
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63 for _, backend_name in ipairs(backends) do
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64 if backend_mechanism[backend_name] == nil then backend_mechanism[backend_name] = {}; end
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65 t_insert(backend_mechanism[backend_name], name);
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66 end
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67 end
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68
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69 -- create a new SASL object which can be used to authenticate clients
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70 local function new(realm, profile)
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71 local mechanisms = profile.mechanisms;
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72 if not mechanisms then
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73 mechanisms = {};
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74 for backend in pairs(profile) do
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75 if backend_mechanism[backend] then
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76 for _, mechanism in ipairs(backend_mechanism[backend]) do
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77 mechanisms[mechanism] = true;
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78 end
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79 end
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80 end
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81 profile.mechanisms = mechanisms;
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82 end
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83 return setmetatable({ profile = profile, realm = realm, mechs = mechanisms }, method);
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84 end
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85
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86 -- add a channel binding handler
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87 function method:add_cb_handler(name, f)
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88 if type(self.profile.cb) ~= "table" then
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89 self.profile.cb = {};
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90 end
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91 self.profile.cb[name] = f;
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92 return self;
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93 end
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94
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95 -- get a fresh clone with the same realm and profile
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96 function method:clean_clone()
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97 return new(self.realm, self.profile)
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98 end
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99
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100 -- get a list of possible SASL mechanims to use
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101 function method:mechanisms()
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102 local current_mechs = {};
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103 for mech, _ in pairs(self.mechs) do
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104 if mechanism_channelbindings[mech] then
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105 if self.profile.cb then
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106 local ok = false;
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107 for cb_name, _ in pairs(self.profile.cb) do
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108 if mechanism_channelbindings[mech][cb_name] then
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109 ok = true;
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110 end
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111 end
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112 if ok == true then current_mechs[mech] = true; end
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113 end
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114 else
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115 current_mechs[mech] = true;
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116 end
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117 end
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118 return current_mechs;
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119 end
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120
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121 -- select a mechanism to use
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122 function method:select(mechanism)
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123 if not self.selected and self.mechs[mechanism] then
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124 self.selected = mechanism;
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125 return true;
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126 end
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127 end
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128
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aaf2b2df61f7 Mostly making the code run; includes fixing typos and so on.
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129 -- feed new messages to process into the library
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130 function method:process(message)
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131 --if message == "" or message == nil then return "failure", "malformed-request" end
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132 return registered_mechanisms[self.selected](self, message);
15
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133 end
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134
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1112871916eb Move each mechanism in an own file.
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135 -- load the mechanisms
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136 require "util.sasl.plain" .init(registerMechanism);
8cfacc41099e util.sasl: Simplified some code a bit.
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parents: 3441
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137 require "util.sasl.anonymous" .init(registerMechanism);
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138 require "util.sasl.scram" .init(registerMechanism);
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e879b53e9df8 util.sasl.external: Add SASL EXTERNAL mechanism
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parents: 4933
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139 require "util.sasl.external" .init(registerMechanism);
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parents:
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140
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5de6b93d0190 util.*: Remove use of module() function, make all module functions local and return them in a table at the end
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parents: 6036
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141 return {
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142 registerMechanism = registerMechanism;
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parents: 6036
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143 new = new;
5de6b93d0190 util.*: Remove use of module() function, make all module functions local and return them in a table at the end
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parents: 6036
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144 };