prosody
28d841403a21
util/sasl.lua

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util/sasl.lua @ 2178:28d841403a21 sasl

Adjust SASL PLAIN mechanism to the new API.
author Tobias Markmann <tm@ayena.de>
date Thu, 27 Aug 2009 21:29:36 +0200
parent 2177:8505e1da5408
child 2179:c985536d5452
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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) 2008-2009 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 tostring = tostring;
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18 local st = require "util.stanza";
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19 local generate_uuid = require "util.uuid".generate;
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20 local pairs, ipairs = pairs, ipairs;
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21 local t_insert, t_concat = table.insert, table.concat;
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22 local to_byte, to_char = string.byte, string.char;
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23 local to_unicode = require "util.encodings".idna.to_unicode;
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24 local s_match = string.match;
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25 local gmatch = string.gmatch
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26 local string = string
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27 local math = require "math"
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28 local type = type
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29 local error = error
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30 local print = print
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31 local setmetatable = setmetatable;
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32 local assert = assert;
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33
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34 require "util.iterators"
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35 local keys = keys
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36
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37 local array = require "util.array"
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38 module "sasl"
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39
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40 --[[
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41 Authentication Backend Prototypes:
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42
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43 plain:
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44 function(username, realm)
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45 return password, state;
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46 end
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47
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48 plain-test:
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49 function(username, realm, password)
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50 return true or false, state;
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51 end
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52
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53 digest-md5:
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54 function(username, realm, encoding)
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55 return digesthash, state;
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56 end
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57
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58 digest-md5-test:
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59 function(username, realm, encoding, digesthash)
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60 return true or false, state;
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61 end
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62 ]]
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63
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64 local method = {};
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65 method.__index = method;
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66 local mechanisms = {};
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67 local backend_mechanism = {};
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68
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69 -- register a new SASL mechanims
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70 local function registerMechanism(name, backends, f)
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71 assert(type(name) == "string", "Parameter name MUST be a string.");
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72 assert(type(backends) == "string" or type(backends) == "table", "Parameter backends MUST be either a string or a table.");
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73 assert(type(f) == "function", "Parameter f MUST be a function.");
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74 mechanisms[name] = f
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75 for _, backend_name in ipairs(backends) do
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76 if backend_mechanism[backend_name] == nil then backend_mechanism[backend_name] = {}; end
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77 t_insert(backend_mechanism[backend_name], name);
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78 end
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79 end
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80
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81 -- create a new SASL object which can be used to authenticate clients
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82 function new(realm, profile)
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83 sasl_i = {profile = profile};
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84 return setmetatable(sasl_i, method);
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85 end
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86
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87 -- get a list of possible SASL mechanims to use
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88 function method:mechanisms()
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89 local mechanisms = {}
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90 for backend, f in pairs(self.profile) do
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91 print(backend)
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92 if backend_mechanism[backend] then
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93 for _, mechanism in ipairs(backend_mechanism[backend]) do
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94 mechanisms[mechanism] = true;
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95 end
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96 end
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97 end
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98 self["possible_mechanisms"] = mechanisms;
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99 return array.collect(keys(mechanisms));
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100 end
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101
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102 -- select a mechanism to use
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103 function method:select(mechanism)
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104 self.mech_i = mechanisms[mechanism]
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105 if self.mech_i == nil then return false; end
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106 return true;
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107 end
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108
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109 -- feed new messages to process into the library
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110 function method:process(message)
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111 if message == "" or message == nil then return "failure", "malformed-request" end
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112 return self.mech_i(self, message);
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113 end
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114
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115 --=========================
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116 --SASL PLAIN
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117 local function sasl_mechanism_plain(self, message)
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118 local response = message
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119 local authorization = s_match(response, "([^&%z]+)")
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120 local authentication = s_match(response, "%z([^&%z]+)%z")
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121 local password = s_match(response, "%z[^&%z]+%z([^&%z]+)")
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122
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123 if authentication == nil or password == nil then return "failure", "malformed-request" end
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124
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125 local correct, state = false, false, false;
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126 if self.profile.plain then
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127 local correct_password, state = self.profile.plain(authentication, self.realm);
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128 if correct_password == password then correct = true; else correct = false; end
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129 else if self.profile.plain_test then
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130 correct, state = self.profile.plain_test(authentication, self.realm, password);
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131 end
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132
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133 self.username = authentication
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134 if not state then
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135 return "failure", "account-disabled";
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136 end
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diff changeset
137
28d841403a21 Adjust SASL PLAIN mechanism to the new API.
Tobias Markmann <tm@ayena.de>
parents: 2177
diff changeset
138 if correct then
28d841403a21 Adjust SASL PLAIN mechanism to the new API.
Tobias Markmann <tm@ayena.de>
parents: 2177
diff changeset
139 return "success";
28d841403a21 Adjust SASL PLAIN mechanism to the new API.
Tobias Markmann <tm@ayena.de>
parents: 2177
diff changeset
140 else
28d841403a21 Adjust SASL PLAIN mechanism to the new API.
Tobias Markmann <tm@ayena.de>
parents: 2177
diff changeset
141 return "failure", "not-authorized";
28d841403a21 Adjust SASL PLAIN mechanism to the new API.
Tobias Markmann <tm@ayena.de>
parents: 2177
diff changeset
142 end
2176
aaf2b2df61f7 Mostly making the code run; includes fixing typos and so on.
Tobias Markmann <tm@ayena.de>
parents: 2175
diff changeset
143 end
aaf2b2df61f7 Mostly making the code run; includes fixing typos and so on.
Tobias Markmann <tm@ayena.de>
parents: 2175
diff changeset
144 registerMechanism("PLAIN", {"plain", "plain_test"}, sasl_mechanism_plain);
aaf2b2df61f7 Mostly making the code run; includes fixing typos and so on.
Tobias Markmann <tm@ayena.de>
parents: 2175
diff changeset
145
519
cccd610a0ef9 Insert copyright/license headers
Matthew Wild <mwild1@gmail.com>
parents: 508
diff changeset
146 return _M;