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cd6836586a6a
util/sasl.lua

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util/sasl.lua @ 3373:cd6836586a6a

util.sasl, util.sasl_cyrus: s/self.mechanisms()/self:mechanisms()/ in method:select().
author Waqas Hussain <waqas20@gmail.com>
date Thu, 15 Jul 2010 22:07:45 +0500
parent 3366:a2a242321901
child 3427:046a8cf304dd
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
896
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 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
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46 local method = {};
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47 method.__index = method;
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48 local mechanisms = {};
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49 local backend_mechanism = {};
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50
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51 -- register a new SASL mechanims
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52 local function registerMechanism(name, backends, f)
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53 assert(type(name) == "string", "Parameter name MUST be a string.");
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54 assert(type(backends) == "string" or type(backends) == "table", "Parameter backends MUST be either a string or a table.");
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55 assert(type(f) == "function", "Parameter f MUST be a function.");
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56 mechanisms[name] = f
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57 for _, backend_name in ipairs(backends) do
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58 if backend_mechanism[backend_name] == nil then backend_mechanism[backend_name] = {}; end
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59 t_insert(backend_mechanism[backend_name], name);
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60 end
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61 end
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62
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63 -- create a new SASL object which can be used to authenticate clients
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64 function new(realm, profile, forbidden)
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65 local sasl_i = {profile = profile};
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66 sasl_i.realm = realm;
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67 local s = setmetatable(sasl_i, method);
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68 if forbidden == nil then forbidden = {} end
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69 s:forbidden(forbidden)
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70 return s;
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71 end
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72
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73 -- get a fresh clone with the same realm, profiles and forbidden mechanisms
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74 function method:clean_clone()
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75 return new(self.realm, self.profile, self:forbidden())
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76 end
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77
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78 -- set the forbidden mechanisms
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79 function method:forbidden( restrict )
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80 if restrict then
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81 -- set forbidden
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82 self.restrict = set.new(restrict);
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83 else
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84 -- get forbidden
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85 return array.collect(self.restrict:items());
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86 end
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87 end
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88
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89 -- get a list of possible SASL mechanims to use
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90 function method:mechanisms()
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91 local mechanisms = self.mechs;
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92 if not mechanisms then
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93 mechanisms = {}
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94 for backend, f in pairs(self.profile) do
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95 if backend_mechanism[backend] then
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96 for _, mechanism in ipairs(backend_mechanism[backend]) do
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97 if not self.restrict:contains(mechanism) then
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98 mechanisms[mechanism] = true;
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99 end
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100 end
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101 end
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102 end
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103 self.mechs = mechanisms;
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104 end
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105 return mechanisms;
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106 end
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107
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108 -- select a mechanism to use
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109 function method:select(mechanism)
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110 if self.mech_i then
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111 return false;
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112 end
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113
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114 self.mech_i = mechanisms[self:mechanisms()[mechanism] and mechanism];
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115 return (self.mech_i ~= nil);
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116 end
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117
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118 -- feed new messages to process into the library
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119 function method:process(message)
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120 --if message == "" or message == nil then return "failure", "malformed-request" end
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121 return self.mech_i(self, message);
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122 end
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123
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124 -- load the mechanisms
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125 local load_mechs = {"plain", "digest-md5", "anonymous", "scram"}
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126 for _, mech in ipairs(load_mechs) do
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127 local name = "util.sasl."..mech;
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128 local m = require(name);
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129 m.init(registerMechanism)
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130 end
c0d754774db2 adding SASL lib with PLAIN support, not tested yet
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
131
519
cccd610a0ef9 Insert copyright/license headers
Matthew Wild <mwild1@gmail.com>
parents: 508
diff changeset
132 return _M;