Annotate

util/sasl_cyrus.lua @ 3428:8a12ae696687

util.sasl_cyrus: Cleanup.
author Waqas Hussain <waqas20@gmail.com>
date Mon, 02 Aug 2010 18:54:16 +0500
parent 3426:37b9b8e171b9
child 3441:d4f89802cf1e
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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.
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 --
8f6526da4757 Adding sasl_cyrus.lua. A sasl.lua drop-in replacement to use CyrusSASL for all c2s authentication.
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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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8f6526da4757 Adding sasl_cyrus.lua. A sasl.lua drop-in replacement to use CyrusSASL for all c2s authentication.
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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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29
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30 local sasl_errstring = {
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31 -- SASL result codes --
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32 [1] = "another step is needed in authentication";
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33 [0] = "successful result";
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34 [-1] = "generic failure";
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35 [-2] = "memory shortage failure";
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36 [-3] = "overflowed buffer";
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37 [-4] = "mechanism not supported";
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38 [-5] = "bad protocol / cancel";
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39 [-6] = "can't request info until later in exchange";
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40 [-7] = "invalid parameter supplied";
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41 [-8] = "transient failure (e.g., weak key)";
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42 [-9] = "integrity check failed";
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43 [-12] = "SASL library not initialized";
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44
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45 -- client only codes --
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46 [2] = "needs user interaction";
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47 [-10] = "server failed mutual authentication step";
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48 [-11] = "mechanism doesn't support requested feature";
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49
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50 -- server only codes --
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51 [-13] = "authentication failure";
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52 [-14] = "authorization failure";
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53 [-15] = "mechanism too weak for this user";
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54 [-16] = "encryption needed to use mechanism";
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55 [-17] = "One time use of a plaintext password will enable requested mechanism for user";
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56 [-18] = "passphrase expired, has to be reset";
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57 [-19] = "account disabled";
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58 [-20] = "user not found";
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59 [-23] = "version mismatch with plug-in";
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60 [-24] = "remote authentication server unavailable";
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61 [-26] = "user exists, but no verifier for user";
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62
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63 -- codes for password setting --
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64 [-21] = "passphrase locked";
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65 [-22] = "requested change was not needed";
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66 [-27] = "passphrase is too weak for security policy";
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67 [-28] = "user supplied passwords not permitted";
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68 };
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69 setmetatable(sasl_errstring, { __index = function() return "undefined error!" end });
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70
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71 module "sasl_cyrus"
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72
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73 local method = {};
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74 method.__index = method;
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75 local initialized = false;
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76
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77 local function init(service_name)
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78 if not initialized then
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79 local st, errmsg = pcall(cyrussasl.server_init, service_name);
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80 if st then
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81 initialized = true;
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82 else
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83 log("error", "Failed to initialize Cyrus SASL: %s", errmsg);
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84 end
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85 end
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86 end
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87
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88 -- create a new SASL object which can be used to authenticate clients
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89 function new(realm, service_name, app_name)
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90
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91 init(app_name or service_name);
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92
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93 local st, ret = pcall(cyrussasl.server_new, service_name, nil, realm, nil, nil)
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94 if not st then
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95 log("error", "Creating SASL server connection failed: %s", ret);
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96 return nil;
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97 end
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98
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99 local sasl_i = { realm = realm, service_name = service_name, cyrus = ret };
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100
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101 if cyrussasl.set_canon_cb then
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102 local c14n_cb = function (user)
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103 local node = s_match(user, "^([^@]+)");
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104 log("debug", "Canonicalizing username %s to %s", user, node)
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105 return node
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106 end
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107 cyrussasl.set_canon_cb(sasl_i.cyrus, c14n_cb);
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108 end
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109
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110 cyrussasl.setssf(sasl_i.cyrus, 0, 0xffffffff)
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111 return setmetatable(sasl_i, method);
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112 end
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113
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114 -- get a fresh clone with the same realm and service name
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115 function method:clean_clone()
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116 return new(self.realm, self.service_name)
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117 end
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118
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119 -- get a list of possible SASL mechanims to use
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120 function method:mechanisms()
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121 local mechanisms = self.mechs;
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122 if not mechanisms then
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123 mechanisms = {}
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124 local cyrus_mechs = cyrussasl.listmech(self.cyrus, nil, "", " ", "")
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125 for w in s_gmatch(cyrus_mechs, "[^ ]+") do
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126 mechanisms[w] = true;
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127 end
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128 self.mechs = mechanisms
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129 end
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130 return mechanisms;
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131 end
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132
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133 -- select a mechanism to use
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134 function method:select(mechanism)
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135 self.mechanism = mechanism;
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136 return self:mechanisms()[mechanism];
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137 end
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138
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139 -- feed new messages to process into the library
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140 function method:process(message)
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141 local err;
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142 local data;
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143
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144 if self.mechanism then
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145 err, data = cyrussasl.server_start(self.cyrus, self.mechanism, message or "")
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146 else
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147 err, data = cyrussasl.server_step(self.cyrus, message or "")
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148 end
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149
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150 self.username = cyrussasl.get_username(self.cyrus)
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151
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152 if (err == 0) then -- SASL_OK
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153 return "success", data
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154 elseif (err == 1) then -- SASL_CONTINUE
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155 return "challenge", data
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156 elseif (err == -4) then -- SASL_NOMECH
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157 log("debug", "SASL mechanism not available from remote end")
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158 return "failure", "invalid-mechanism", "SASL mechanism not available"
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159 elseif (err == -13) then -- SASL_BADAUTH
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160 return "failure", "not-authorized", sasl_errstring[err];
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161 else
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162 log("debug", "Got SASL error condition %d: %s", err, sasl_errstring[err]);
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163 return "failure", "undefined-condition", sasl_errstring[err];
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164 end
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165 end
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166
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167 return _M;