prosody
dd9fa511494a
util/sasl_cyrus.lua

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util/sasl_cyrus.lua @ 8298:dd9fa511494a

mod_pubsub: Add method to clear data from a simple_itemstore
author Kim Alvefur <zash@zash.se>
date Sun, 08 Oct 2017 01:28:32 +0200
parent 6777:5de6b93d0190
child 8555:4f0f5b49bb03
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2389
8f6526da4757 Adding sasl_cyrus.lua. A sasl.lua drop-in replacement to use CyrusSASL for all c2s authentication.
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parents:
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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:
8f6526da4757 Adding sasl_cyrus.lua. A sasl.lua drop-in replacement to use CyrusSASL for all c2s authentication.
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7 --
8f6526da4757 Adding sasl_cyrus.lua. A sasl.lua drop-in replacement to use CyrusSASL for all c2s authentication.
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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.
8f6526da4757 Adding sasl_cyrus.lua. A sasl.lua drop-in replacement to use CyrusSASL for all c2s authentication.
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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>
parents:
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13
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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14 local cyrussasl = require "cyrussasl";
8f6526da4757 Adding sasl_cyrus.lua. A sasl.lua drop-in replacement to use CyrusSASL for all c2s authentication.
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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 local _ENV = nil;
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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 -- host_fqdn may be nil in which case gethostname() gives the value.
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82 -- For GSSAPI, this determines the hostname in the service ticket (after
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83 -- reverse DNS canonicalization, only if [libdefaults] rdns = true which
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84 -- is the default).
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85 local function new(realm, service_name, app_name, host_fqdn)
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86
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87 init(app_name or service_name);
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88
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89 local st, ret = pcall(cyrussasl.server_new, service_name, host_fqdn, realm, nil, nil)
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90 if not st then
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91 log("error", "Creating SASL server connection failed: %s", ret);
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92 return nil;
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93 end
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94
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95 local sasl_i = { realm = realm, service_name = service_name, cyrus = ret };
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96
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97 if cyrussasl.set_canon_cb then
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98 local c14n_cb = function (user)
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99 local node = s_match(user, "^([^@]+)");
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100 log("debug", "Canonicalizing username %s to %s", user, node)
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101 return node
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102 end
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103 cyrussasl.set_canon_cb(sasl_i.cyrus, c14n_cb);
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104 end
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105
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106 cyrussasl.setssf(sasl_i.cyrus, 0, 0xffffffff)
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107 local mechanisms = {};
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108 local cyrus_mechs = cyrussasl.listmech(sasl_i.cyrus, nil, "", " ", "");
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109 for w in s_gmatch(cyrus_mechs, "[^ ]+") do
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110 mechanisms[w] = true;
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111 end
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112 sasl_i.mechs = mechanisms;
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113 return setmetatable(sasl_i, method);
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114 end
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115
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116 -- get a fresh clone with the same realm and service name
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117 function method:clean_clone()
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118 return new(self.realm, self.service_name)
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119 end
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120
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121 -- get a list of possible SASL mechanims to use
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122 function method:mechanisms()
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123 return self.mechs;
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124 end
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125
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126 -- select a mechanism to use
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127 function method:select(mechanism)
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128 if not self.selected and self.mechs[mechanism] then
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129 self.selected = mechanism;
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130 return true;
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131 end
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132 end
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133
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134 -- feed new messages to process into the library
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135 function method:process(message)
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136 local err;
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137 local data;
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138
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139 if not self.first_step_done then
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140 err, data = cyrussasl.server_start(self.cyrus, self.selected, message or "")
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141 self.first_step_done = true;
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142 else
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143 err, data = cyrussasl.server_step(self.cyrus, message or "")
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144 end
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145
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146 self.username = cyrussasl.get_username(self.cyrus)
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147
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148 if (err == 0) then -- SASL_OK
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149 if self.require_provisioning and not self.require_provisioning(self.username) then
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150 return "failure", "not-authorized", "User authenticated successfully, but not provisioned for XMPP";
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151 end
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152 return "success", data
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153 elseif (err == 1) then -- SASL_CONTINUE
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154 return "challenge", data
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155 elseif (err == -4) then -- SASL_NOMECH
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156 log("debug", "SASL mechanism not available from remote end")
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157 return "failure", "invalid-mechanism", "SASL mechanism not available"
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158 elseif (err == -13) then -- SASL_BADAUTH
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159 return "failure", "not-authorized", sasl_errstring[err];
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160 else
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161 log("debug", "Got SASL error condition %d: %s", err, sasl_errstring[err]);
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162 return "failure", "undefined-condition", sasl_errstring[err];
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163 end
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164 end
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165
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166 return {
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167 new = new;
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168 };