prosody
1b0c7e7c6be8
util/sasl.lua

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util/sasl.lua @ 5841:1b0c7e7c6be8

Only advertise mechanisms needing channel binding if a channel binding backend is avaliable.
author Tobias Markmann <tm@ayena.de>
date Mon, 07 Feb 2011 13:24:42 +0100
parent 5831:aa4bdabd3c0f
child 5843:fb6573e191cf
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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 local print = print
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22
38
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23 module "sasl"
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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 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 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 function new(realm, profile)
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71 local mechanisms = {};
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72 for backend, f in pairs(profile) do
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73 if backend_mechanism[backend] then
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74 for _, mechanism in ipairs(backend_mechanism[backend]) do
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75 mechanisms[mechanism] = true;
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76 end
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77 end
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78 end
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79 return setmetatable({ profile = profile, realm = realm, mechs = mechanisms }, method);
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80 end
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81
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82 -- add a channel binding handler
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83 function method:add_cb_handler(name, f)
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84 if type(self.profile.cb) ~= "table" then
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85 self.profile.cb = {};
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86 end
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87 self.profile.cb[name] = f;
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88 return self;
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89 end
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90
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91 -- get a fresh clone with the same realm and profile
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92 function method:clean_clone()
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93 return new(self.realm, self.profile)
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94 end
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95
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96 -- get a list of possible SASL mechanims to use
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97 function method:mechanisms()
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98 local current_mechs = {};
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99 for mech, _ in pairs(self.mechs) do
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100 if mechanism_channelbindings[mech] and self.profile.cb then
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101 local ok = false;
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102 for cb_name, _ in pairs(self.profile.cb) do
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103 if mechanism_channelbindings[mech][cb_name] then
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104 ok = true;
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105 end
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106 end
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107 if ok == true then current_mechs[mech] = true; end
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108 else
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109 current_mechs[mech] = true;
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110 end
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111 end
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112 return current_mechs;
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113 end
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114
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115 -- select a mechanism to use
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116 function method:select(mechanism)
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117 if not self.selected and self.mechs[mechanism] then
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118 self.selected = mechanism;
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119 return true;
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120 end
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121 end
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122
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123 -- feed new messages to process into the library
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124 function method:process(message)
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125 --if message == "" or message == nil then return "failure", "malformed-request" end
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126 return mechanisms[self.selected](self, message);
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127 end
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b7ea802f3527 Adding inital support for ANONYMOUS mechanism in SASL.
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parents: 760
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128
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129 -- load the mechanisms
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130 require "util.sasl.plain" .init(registerMechanism);
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131 require "util.sasl.digest-md5".init(registerMechanism);
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132 require "util.sasl.anonymous" .init(registerMechanism);
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133 require "util.sasl.scram" .init(registerMechanism);
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134
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cccd610a0ef9 Insert copyright/license headers
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135 return _M;