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0f884bb1f08a
util/sasl_cyrus.lua

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util/sasl_cyrus.lua @ 2402:0f884bb1f08a

util.sasl_cyrus: Automatically initialize Cyrus SASL with the first used service name.
author Tobias Markmann <tm@ayena.de>
date Tue, 29 Dec 2009 01:03:37 +0100
parent 2401:dbfdcb75209a
child 2403:916482cdfb74
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rev   line source
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8f6526da4757 Adding sasl_cyrus.lua. A sasl.lua drop-in replacement to use CyrusSASL for all c2s authentication.
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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.
8f6526da4757 Adding sasl_cyrus.lua. A sasl.lua drop-in replacement to use CyrusSASL for all c2s authentication.
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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.
8f6526da4757 Adding sasl_cyrus.lua. A sasl.lua drop-in replacement to use CyrusSASL for all c2s authentication.
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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.
8f6526da4757 Adding sasl_cyrus.lua. A sasl.lua drop-in replacement to use CyrusSASL for all c2s authentication.
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13
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14 local cyrussasl = require "cyrussasl";
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15 local log = require "util.logger".init("sasl_cyrus");
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16 local array = require "util.array";
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18 local tostring = tostring;
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19 local pairs, ipairs = pairs, ipairs;
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20 local t_insert, t_concat = table.insert, table.concat;
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21 local s_match = string.match;
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22 local setmetatable = setmetatable
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24 local keys = keys;
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26 local print = print
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27 local pcall = pcall
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28 local s_match, s_gmatch = string.match, string.gmatch
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30 module "sasl_cyrus"
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31
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32 local method = {};
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33 method.__index = method;
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34 local initialized = false;
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35
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36 local function init(service_name)
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37 if not initialized then
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38 if pcall(cyrussasl.server_init, service_name) then
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39 initialized = true;
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40 end
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41 end
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42 end
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43
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44 -- create a new SASL object which can be used to authenticate clients
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45 function new(realm, service_name)
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46 local sasl_i = {};
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47
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48 init(service_name);
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49
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50 sasl_i.realm = realm;
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51 sasl_i.service_name = service_name;
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52 sasl_i.cyrus = cyrussasl.server_new(service_name, nil, nil, nil, nil)
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53 if sasl_i.cyrus == 0 then
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54 log("error", "got NULL return value from server_new")
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55 return nil;
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56 end
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57 cyrussasl.setssf(sasl_i.cyrus, 0, 0xffffffff)
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58 local s = setmetatable(sasl_i, method);
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59 return s;
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60 end
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61
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62 -- get a fresh clone with the same realm, profiles and forbidden mechanisms
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63 function method:clean_clone()
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64 return new(self.realm, self.service_name)
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65 end
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66
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67 -- set the forbidden mechanisms
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68 function method:forbidden( restrict )
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69 log("debug", "Called method:forbidden. NOT IMPLEMENTED.")
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70 return {}
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71 end
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72
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73 -- get a list of possible SASL mechanims to use
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74 function method:mechanisms()
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75 local mechanisms = {}
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76 local cyrus_mechs = cyrussasl.listmech(self.cyrus, nil, "", " ", "")
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77 for w in s_gmatch(cyrus_mechs, "[^ ]+") do
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78 mechanisms[w] = true;
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79 end
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80 self.mechs = mechanisms
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81 return array.collect(keys(mechanisms));
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82 end
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83
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84 -- select a mechanism to use
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85 function method:select(mechanism)
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86 self.mechanism = mechanism;
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87 return self.mechs[mechanism];
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88 end
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89
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90 -- feed new messages to process into the library
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91 function method:process(message)
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92 local err;
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93 local data;
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94
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95 if self.mechanism then
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96 err, data = cyrussasl.server_start(self.cyrus, self.mechanism, message or "")
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97 else
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98 err, data = cyrussasl.server_step(self.cyrus, message or "")
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99 end
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100
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101 self.username = cyrussasl.get_username(self.cyrus)
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102
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103 if (err == 0) then -- SASL_OK
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104 return "success", data
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105 elseif (err == 1) then -- SASL_CONTINUE
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106 return "challenge", data
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107 elseif (err == -4) then -- SASL_NOMECH
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108 log("debug", "SASL mechanism not available from remote end")
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109 return "failure",
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110 "undefined-condition",
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111 "SASL mechanism not available"
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112 elseif (err == -13) then -- SASL_BADAUTH
8f6526da4757 Adding sasl_cyrus.lua. A sasl.lua drop-in replacement to use CyrusSASL for all c2s authentication.
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113 return "failure", "not-authorized"
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114 else
8f6526da4757 Adding sasl_cyrus.lua. A sasl.lua drop-in replacement to use CyrusSASL for all c2s authentication.
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115 log("debug", "Got SASL error condition %d", err)
8f6526da4757 Adding sasl_cyrus.lua. A sasl.lua drop-in replacement to use CyrusSASL for all c2s authentication.
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116 return "failure",
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117 "undefined-condition",
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118 cyrussasl.get_message( self.cyrus )
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119 end
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120 end
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121
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122 return _M;