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util/sasl_cyrus.lua @ 2392:8777831706d9

util.sasl_cyrus: Log errors if CyrusSASL init fails.
author Tobias Markmann <tm@ayena.de>
date Tue, 22 Dec 2009 20:21:44 +0100
parent 2389:8f6526da4757
child 2393:1572be348f88
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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.
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.
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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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23 local keys = keys;
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25 local print = print
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27 module "sasl_cyrus"
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29 local method = {};
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30 method.__index = method;
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31 local mechanisms = {};
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32 local backend_mechanism = {};
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33
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34 -- register a new SASL mechanims
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35 local function registerMechanism(name, backends, f)
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36 assert(type(name) == "string", "Parameter name MUST be a string.");
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37 assert(type(backends) == "string" or type(backends) == "table", "Parameter backends MUST be either a string or a table.");
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38 assert(type(f) == "function", "Parameter f MUST be a function.");
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39 mechanisms[name] = f
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40 for _, backend_name in ipairs(backends) do
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41 if backend_mechanism[backend_name] == nil then backend_mechanism[backend_name] = {}; end
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42 t_insert(backend_mechanism[backend_name], name);
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43 end
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44 end
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45
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46 -- create a new SASL object which can be used to authenticate clients
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47 function new(realm, service_name)
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48 local sasl_i = {};
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49 sasl_i.realm = realm;
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50 sasl_i.service_name = service_name;
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51 sasl_i.cyrus = cyrussasl.server_new(service_name, realm, realm, nil, nil)
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52 if sasl_i.cyrus == 0 then
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53 log("error", "got NULL return value from server_new")
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54 return nil;
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55 end
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56 cyrussasl.setssf(sasl_i.cyrus, 0, 0xffffffff)
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57 local s = setmetatable(sasl_i, method);
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58 return s;
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59 end
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60
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61 -- get a fresh clone with the same realm, profiles and forbidden mechanisms
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62 function method:clean_clone()
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63 return new(self.realm, self.service_name)
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64 end
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65
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66 -- set the forbidden mechanisms
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67 function method:forbidden( restrict )
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68 log("debug", "Called method:forbidden. NOT IMPLEMENTED.")
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69 return {}
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70 end
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71
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72 -- get a list of possible SASL mechanims to use
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73 function method:mechanisms()
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74 local mechanisms = {}
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75 local cyrus_mechs = cyrussasl.listmech(self.cyrus)
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76 for w in s_gmatch(cyrus_mechs, "%a+") do
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77 mechanisms[w] = true;
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78 end
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79 self.mechanisms = mechanisms
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80 return array.collect(keys(mechanisms));
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81 end
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82
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83 -- select a mechanism to use
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84 function method:select(mechanism)
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85 self.mechanism = mechanism;
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86 return not self.mechanisms[mechanisms];
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87 end
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88
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89 -- feed new messages to process into the library
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90 function method:process(message)
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91 local err;
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92 local data;
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93 if self.mechanism then
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94 err, data = cyrussasl.server_start(self.cyrus, self.mechanism, message)
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95 else
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96 err, data = cyrussasl.server_step(self.cyrus, message)
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97 end
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98
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99 self.username = cyrussasl.get_username(self.cyrus)
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100
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101 if (err == 0) then -- SASL_OK
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102 return "success", data
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103 elseif (err == 1) then -- SASL_CONTINUE
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104 return "challenge", data
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105 elseif (err == -4) then -- SASL_NOMECH
8f6526da4757 Adding sasl_cyrus.lua. A sasl.lua drop-in replacement to use CyrusSASL for all c2s authentication.
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106 log("debug", "SASL mechanism not available from remote end")
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107 return "failure",
8f6526da4757 Adding sasl_cyrus.lua. A sasl.lua drop-in replacement to use CyrusSASL for all c2s authentication.
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108 "undefined-condition",
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109 "SASL mechanism not available"
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110 elseif (err == -13) then -- SASL_BADAUTH
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111 return "failure", "not-authorized"
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112 else
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113 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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114 return "failure",
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115 "undefined-condition",
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116 cyrussasl.get_message( self.cyrus )
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117 end
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118 end
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119
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120 return _M;