prosody
1159e007cc8f
util/sasl_cyrus.lua

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util/sasl_cyrus.lua @ 3443:1159e007cc8f

util.sasl_cyrus: Make multi-step SASL mechanisms work correctly.
author Waqas Hussain <waqas20@gmail.com>
date Tue, 03 Aug 2010 18:20:29 +0500
parent 3441:d4f89802cf1e
child 3467:c9f4c3aa14a1
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 --
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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 local cyrussasl = require "cyrussasl";
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15 local log = require "util.logger".init("sasl_cyrus");
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16
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17 local setmetatable = setmetatable
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18
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19 local pcall = pcall
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20 local s_match, s_gmatch = string.match, string.gmatch
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21
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22 local sasl_errstring = {
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23 -- SASL result codes --
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24 [1] = "another step is needed in authentication";
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25 [0] = "successful result";
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26 [-1] = "generic failure";
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27 [-2] = "memory shortage failure";
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28 [-3] = "overflowed buffer";
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29 [-4] = "mechanism not supported";
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30 [-5] = "bad protocol / cancel";
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31 [-6] = "can't request info until later in exchange";
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32 [-7] = "invalid parameter supplied";
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33 [-8] = "transient failure (e.g., weak key)";
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34 [-9] = "integrity check failed";
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35 [-12] = "SASL library not initialized";
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36
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37 -- client only codes --
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38 [2] = "needs user interaction";
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39 [-10] = "server failed mutual authentication step";
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40 [-11] = "mechanism doesn't support requested feature";
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41
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42 -- server only codes --
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43 [-13] = "authentication failure";
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44 [-14] = "authorization failure";
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45 [-15] = "mechanism too weak for this user";
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46 [-16] = "encryption needed to use mechanism";
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47 [-17] = "One time use of a plaintext password will enable requested mechanism for user";
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48 [-18] = "passphrase expired, has to be reset";
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49 [-19] = "account disabled";
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50 [-20] = "user not found";
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51 [-23] = "version mismatch with plug-in";
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52 [-24] = "remote authentication server unavailable";
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53 [-26] = "user exists, but no verifier for user";
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54
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55 -- codes for password setting --
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56 [-21] = "passphrase locked";
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57 [-22] = "requested change was not needed";
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58 [-27] = "passphrase is too weak for security policy";
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59 [-28] = "user supplied passwords not permitted";
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60 };
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61 setmetatable(sasl_errstring, { __index = function() return "undefined error!" end });
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62
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63 module "sasl_cyrus"
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64
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65 local method = {};
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66 method.__index = method;
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67 local initialized = false;
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68
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69 local function init(service_name)
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70 if not initialized then
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71 local st, errmsg = pcall(cyrussasl.server_init, service_name);
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72 if st then
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73 initialized = true;
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74 else
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75 log("error", "Failed to initialize Cyrus SASL: %s", errmsg);
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76 end
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77 end
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78 end
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79
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80 -- create a new SASL object which can be used to authenticate clients
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81 function new(realm, service_name, app_name)
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82
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83 init(app_name or service_name);
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84
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85 local st, ret = pcall(cyrussasl.server_new, service_name, nil, realm, nil, nil)
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86 if not st then
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87 log("error", "Creating SASL server connection failed: %s", ret);
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88 return nil;
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89 end
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90
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91 local sasl_i = { realm = realm, service_name = service_name, cyrus = ret };
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92
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93 if cyrussasl.set_canon_cb then
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94 local c14n_cb = function (user)
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95 local node = s_match(user, "^([^@]+)");
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96 log("debug", "Canonicalizing username %s to %s", user, node)
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97 return node
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98 end
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99 cyrussasl.set_canon_cb(sasl_i.cyrus, c14n_cb);
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100 end
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101
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102 cyrussasl.setssf(sasl_i.cyrus, 0, 0xffffffff)
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103 return setmetatable(sasl_i, method);
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104 end
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105
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106 -- get a fresh clone with the same realm and service name
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107 function method:clean_clone()
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108 return new(self.realm, self.service_name)
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109 end
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110
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111 -- get a list of possible SASL mechanims to use
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112 function method:mechanisms()
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113 local mechanisms = self.mechs;
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114 if not mechanisms then
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115 mechanisms = {}
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116 local cyrus_mechs = cyrussasl.listmech(self.cyrus, nil, "", " ", "")
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117 for w in s_gmatch(cyrus_mechs, "[^ ]+") do
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118 mechanisms[w] = true;
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119 end
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120 self.mechs = mechanisms
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121 end
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122 return mechanisms;
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123 end
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124
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125 -- select a mechanism to use
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126 function method:select(mechanism)
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127 self.mechanism = mechanism;
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128 return self:mechanisms()[mechanism];
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129 end
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130
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131 -- feed new messages to process into the library
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132 function method:process(message)
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133 local err;
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134 local data;
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135
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136 if not self.first_step_done then
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137 err, data = cyrussasl.server_start(self.cyrus, self.mechanism, message or "")
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138 self.first_step_done = true;
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139 else
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140 err, data = cyrussasl.server_step(self.cyrus, message or "")
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141 end
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142
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143 self.username = cyrussasl.get_username(self.cyrus)
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144
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145 if (err == 0) then -- SASL_OK
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146 return "success", data
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147 elseif (err == 1) then -- SASL_CONTINUE
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148 return "challenge", data
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149 elseif (err == -4) then -- SASL_NOMECH
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150 log("debug", "SASL mechanism not available from remote end")
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151 return "failure", "invalid-mechanism", "SASL mechanism not available"
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152 elseif (err == -13) then -- SASL_BADAUTH
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153 return "failure", "not-authorized", sasl_errstring[err];
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154 else
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155 log("debug", "Got SASL error condition %d: %s", err, sasl_errstring[err]);
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156 return "failure", "undefined-condition", sasl_errstring[err];
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157 end
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158 end
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159
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160 return _M;