prosody
e091b308732f
util/sasl.lua

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util/sasl.lua @ 2205:e091b308732f

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author Tobias Markmann <tm@ayena.de>
date Thu, 19 Nov 2009 00:04:14 +0100
parent 2203:812130099ab2
child 2212:7cb6460b18d8
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rev   line source
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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 sasl_i = {profile = profile};
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87 sasl_i.realm = realm;
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88 s = setmetatable(sasl_i, method);
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89 s:forbidden(sasl_i, forbidden)
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90 return s;
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91 end
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92
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93 -- set the forbidden mechanisms
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94 function method:forbidden( restrict )
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95 if restrict then
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96 -- set forbidden
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97 self.restrict = set.new(restrict);
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98 else
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99 -- get forbidden
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100 return array.collect(self.restrict:items());
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101 end
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102 end
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103
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104 -- get a list of possible SASL mechanims to use
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105 function method:mechanisms()
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106 local mechanisms = {}
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107 for backend, f in pairs(self.profile) do
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108 if backend_mechanism[backend] then
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109 for _, mechanism in ipairs(backend_mechanism[backend]) do
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110 if not sasl_i.restrict:contains(mechanism) then
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111 mechanisms[mechanism] = true;
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112 end
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113 end
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114 end
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115 end
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116 self["possible_mechanisms"] = mechanisms;
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117 return array.collect(keys(mechanisms));
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118 end
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119
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120 -- select a mechanism to use
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121 function method:select(mechanism)
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122 if self.mech_i then
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123 return false;
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124 end
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125
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126 self.mech_i = mechanisms[mechanism]
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127 if self.mech_i == nil then
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128 return false;
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129 end
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130 return true;
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131 end
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132
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133 -- feed new messages to process into the library
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134 function method:process(message)
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135 --if message == "" or message == nil then return "failure", "malformed-request" end
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136 return self.mech_i(self, message);
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137 end
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138
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139 -- load the mechanisms
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d18b4d22b8da Making interop with libpurple. (Thanks darkrain).
Tobias Markmann <tm@ayena.de>
parents: 2193
diff changeset
140 load_mechs = {"plain", "digest-md5", "anonymous", "scram"}
2188
1fd38975addd Add support for plain profile in digest-md5 implementation.
Tobias Markmann <tm@ayena.de>
parents: 2187
diff changeset
141 for _, mech in ipairs(load_mechs) do
1fd38975addd Add support for plain profile in digest-md5 implementation.
Tobias Markmann <tm@ayena.de>
parents: 2187
diff changeset
142 local name = "util.sasl."..mech;
1fd38975addd Add support for plain profile in digest-md5 implementation.
Tobias Markmann <tm@ayena.de>
parents: 2187
diff changeset
143 local m = require(name);
1fd38975addd Add support for plain profile in digest-md5 implementation.
Tobias Markmann <tm@ayena.de>
parents: 2187
diff changeset
144 m.init(registerMechanism)
1fd38975addd Add support for plain profile in digest-md5 implementation.
Tobias Markmann <tm@ayena.de>
parents: 2187
diff changeset
145 end
2183
44e71e65da86 Importing SASL Digest-MD5 code. Now for real.
Tobias Markmann <tm@ayena.de>
parents: 2182
diff changeset
146
519
cccd610a0ef9 Insert copyright/license headers
Matthew Wild <mwild1@gmail.com>
parents: 508
diff changeset
147 return _M;