prosody
32dc830d976c
util/sasl_cyrus.lua

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util/sasl_cyrus.lua @ 3365:32dc830d976c

util.sasl, util.sasl_cyrus: Updated method:mechanisms() to cache and re-use list of mechanisms.
author Waqas Hussain <waqas20@gmail.com>
date Wed, 14 Jul 2010 20:10:35 +0500
parent 3363:a4bb658d3fcb
child 3366:a2a242321901
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 --
8f6526da4757 Adding sasl_cyrus.lua. A sasl.lua drop-in replacement to use CyrusSASL for all c2s authentication.
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4 -- All rights reserved.
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5 --
8f6526da4757 Adding sasl_cyrus.lua. A sasl.lua drop-in replacement to use CyrusSASL for all c2s authentication.
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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.
Tobias Markmann <tm@ayena.de>
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13
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 local sasl_i = {};
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91
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92 init(app_name or service_name);
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93
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94 sasl_i.realm = realm;
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95 sasl_i.service_name = service_name;
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96
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97 local st, ret = pcall(cyrussasl.server_new, service_name, nil, realm, nil, nil)
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98 if st then
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99 sasl_i.cyrus = ret;
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100 else
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101 log("error", "Creating SASL server connection failed: %s", ret);
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102 return nil;
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103 end
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104
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105 if cyrussasl.set_canon_cb then
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106 local c14n_cb = function (user)
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107 local node = s_match(user, "^([^@]+)");
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108 log("debug", "Canonicalizing username %s to %s", user, node)
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109 return node
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110 end
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111 cyrussasl.set_canon_cb(sasl_i.cyrus, c14n_cb);
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112 end
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113
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114 cyrussasl.setssf(sasl_i.cyrus, 0, 0xffffffff)
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115 local s = setmetatable(sasl_i, method);
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116 return s;
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117 end
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118
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119 -- get a fresh clone with the same realm, profiles and forbidden mechanisms
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120 function method:clean_clone()
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121 return new(self.realm, self.service_name)
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122 end
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123
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124 -- set the forbidden mechanisms
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125 function method:forbidden( restrict )
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126 log("warn", "Called method:forbidden. NOT IMPLEMENTED.")
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127 return {}
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128 end
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129
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130 -- get a list of possible SASL mechanims to use
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131 function method:mechanisms()
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132 local mechanisms = self.mechs;
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133 if not mechanisms then
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134 mechanisms = {}
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135 local cyrus_mechs = cyrussasl.listmech(self.cyrus, nil, "", " ", "")
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136 for w in s_gmatch(cyrus_mechs, "[^ ]+") do
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137 mechanisms[w] = true;
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138 end
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139 self.mechs = mechanisms
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140 end
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141 return mechanisms;
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142 end
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143
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144 -- select a mechanism to use
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145 function method:select(mechanism)
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146 self.mechanism = mechanism;
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147 if not self.mechs then self:mechanisms(); end
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148 return self.mechs[mechanism];
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149 end
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150
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151 -- feed new messages to process into the library
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152 function method:process(message)
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153 local err;
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154 local data;
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155
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156 if self.mechanism then
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157 err, data = cyrussasl.server_start(self.cyrus, self.mechanism, message or "")
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158 else
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159 err, data = cyrussasl.server_step(self.cyrus, message or "")
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160 end
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161
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162 self.username = cyrussasl.get_username(self.cyrus)
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163
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164 if (err == 0) then -- SASL_OK
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165 return "success", data
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166 elseif (err == 1) then -- SASL_CONTINUE
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167 return "challenge", data
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168 elseif (err == -4) then -- SASL_NOMECH
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169 log("debug", "SASL mechanism not available from remote end")
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170 return "failure", "invalid-mechanism", "SASL mechanism not available"
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171 elseif (err == -13) then -- SASL_BADAUTH
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172 return "failure", "not-authorized", sasl_errstring[err];
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173 else
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174 log("debug", "Got SASL error condition %d: %s", err, sasl_errstring[err]);
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175 return "failure", "undefined-condition", sasl_errstring[err];
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176 end
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177 end
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178
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179 return _M;