prosody
eff0c5fe9119
util/sasl_cyrus.lua

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util/sasl_cyrus.lua @ 3899:eff0c5fe9119

Merge 0.8->trunk (uh-oh)
author Matthew Wild <mwild1@gmail.com>
date Sun, 19 Dec 2010 02:36:56 +0000
parent 3550:5e5d136d9de0
child 5000:58c9519dc461
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 local mechanisms = {};
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104 local cyrus_mechs = cyrussasl.listmech(sasl_i.cyrus, nil, "", " ", "");
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105 for w in s_gmatch(cyrus_mechs, "[^ ]+") do
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106 mechanisms[w] = true;
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107 end
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108 sasl_i.mechs = mechanisms;
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109 return setmetatable(sasl_i, method);
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110 end
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111
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112 -- get a fresh clone with the same realm and service name
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113 function method:clean_clone()
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114 return new(self.realm, self.service_name)
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115 end
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116
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117 -- get a list of possible SASL mechanims to use
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118 function method:mechanisms()
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119 return self.mechs;
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120 end
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121
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122 -- select a mechanism to use
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123 function method:select(mechanism)
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124 if not self.selected and self.mechs[mechanism] then
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125 self.selected = mechanism;
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126 return true;
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127 end
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128 end
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129
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130 -- feed new messages to process into the library
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131 function method:process(message)
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132 local err;
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133 local data;
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134
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135 if not self.first_step_done then
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136 err, data = cyrussasl.server_start(self.cyrus, self.selected, message or "")
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137 self.first_step_done = true;
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138 else
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139 err, data = cyrussasl.server_step(self.cyrus, message or "")
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140 end
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141
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142 self.username = cyrussasl.get_username(self.cyrus)
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143
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144 if (err == 0) then -- SASL_OK
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145 if self.require_provisioning and not self.require_provisioning(self.username) then
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146 return "failure", "not-authorized", "User authenticated successfully, but not provisioned for XMPP";
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147 end
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148 return "success", data
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149 elseif (err == 1) then -- SASL_CONTINUE
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150 return "challenge", data
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151 elseif (err == -4) then -- SASL_NOMECH
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152 log("debug", "SASL mechanism not available from remote end")
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153 return "failure", "invalid-mechanism", "SASL mechanism not available"
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154 elseif (err == -13) then -- SASL_BADAUTH
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155 return "failure", "not-authorized", sasl_errstring[err];
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156 else
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157 log("debug", "Got SASL error condition %d: %s", err, sasl_errstring[err]);
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158 return "failure", "undefined-condition", sasl_errstring[err];
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159 end
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160 end
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161
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162 return _M;