annotate mod_lib_ldap/ldap.lib.lua @ 5381:32a9817c7516

mod_firewall: Initialize compiled chunk just once for all handlers This should fix a case where some stateful dependencies (such as throttles) produce separate instances for every call to new_handler(), leading to surprising behaviour (e.g. rules executed via JUMP CHAIN vs ::deliver would have separate rate limits). This also adds better error handling in case the compiled code fails to run for some reason.
author Matthew Wild <mwild1@gmail.com>
date Fri, 28 Apr 2023 13:27:06 +0100
parents 66b3085ecc49
children
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1 -- vim:sts=4 sw=4
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2
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3 -- Prosody IM
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4 -- Copyright (C) 2008-2010 Matthew Wild
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5 -- Copyright (C) 2008-2010 Waqas Hussain
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6 -- Copyright (C) 2012 Rob Hoelz
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7 --
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8 -- This project is MIT/X11 licensed. Please see the
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9 -- COPYING file in the source package for more information.
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10 --
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11
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12 local ldap;
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13 local connection;
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14 local params = module:get_option("ldap");
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15 local format = string.format;
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16 local tconcat = table.concat;
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17
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18 local _M = {};
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19
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20 local config_params = {
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21 hostname = 'string',
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22 user = {
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23 basedn = 'string',
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24 namefield = 'string',
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25 filter = 'string',
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26 usernamefield = 'string',
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27 },
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28 groups = {
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29 basedn = 'string',
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30 namefield = 'string',
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31 memberfield = 'string',
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32
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33 _member = {
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34 name = 'string',
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35 admin = 'boolean?',
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36 },
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37 },
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38 admin = {
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39 _optional = true,
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40 basedn = 'string',
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41 namefield = 'string',
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42 filter = 'string',
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43 }
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44 }
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45
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46 local function run_validation(params, config, prefix)
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47 prefix = prefix or '';
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48
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49 -- verify that every required member of config is present in params
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50 for k, v in pairs(config) do
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51 if type(k) == 'string' and k:sub(1, 1) ~= '_' then
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52 local is_optional;
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53 if type(v) == 'table' then
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54 is_optional = v._optional;
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55 else
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56 is_optional = v:sub(-1) == '?';
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57 end
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58
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59 if not is_optional and params[k] == nil then
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60 return nil, prefix .. k .. ' is required';
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61 end
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62 end
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63 end
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64
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65 for k, v in pairs(params) do
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66 local expected_type = config[k];
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67
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68 local ok, err = true;
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69
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70 if type(k) == 'string' then
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71 -- verify that this key is present in config
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72 if k:sub(1, 1) == '_' or expected_type == nil then
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73 return nil, 'invalid parameter ' .. prefix .. k;
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74 end
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75
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76 -- type validation
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77 if type(expected_type) == 'string' then
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78 if expected_type:sub(-1) == '?' then
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79 expected_type = expected_type:sub(1, -2);
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80 end
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81
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82 if type(v) ~= expected_type then
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83 return nil, 'invalid type for parameter ' .. prefix .. k;
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84 end
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85 else -- it's a table (or had better be)
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86 if type(v) ~= 'table' then
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87 return nil, 'invalid type for parameter ' .. prefix .. k;
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88 end
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89
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90 -- recurse into child
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91 ok, err = run_validation(v, expected_type, prefix .. k .. '.');
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92 end
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93 else -- it's an integer (or had better be)
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94 if not config._member then
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95 return nil, 'invalid parameter ' .. prefix .. tostring(k);
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96 end
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97 ok, err = run_validation(v, config._member, prefix .. tostring(k) .. '.');
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98 end
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99
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100 if not ok then
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101 return ok, err;
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102 end
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103 end
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104
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105 return true;
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106 end
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107
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108 local function validate_config()
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109 if true then
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110 return true; -- XXX for now
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111 end
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112
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113 -- this is almost too clever (I mean that in a bad
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114 -- maintainability sort of way)
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115 --
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116 -- basically this allows a free pass for a key in group members
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117 -- equal to params.groups.namefield
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118 setmetatable(config_params.groups._member, {
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119 __index = function(_, k)
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120 if k == params.groups.namefield then
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121 return 'string';
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122 end
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123 end
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124 });
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125
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126 local ok, err = run_validation(params, config_params);
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127
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128 setmetatable(config_params.groups._member, nil);
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129
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130 if ok then
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131 -- a little extra validation that doesn't fit into
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132 -- my recursive checker
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133 local group_namefield = params.groups.namefield;
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134 for i, group in ipairs(params.groups) do
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135 if not group[group_namefield] then
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136 return nil, format('groups.%d.%s is required', i, group_namefield);
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137 end
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138 end
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139
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140 -- fill in params.admin if you can
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141 if not params.admin and params.groups then
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142 local admingroup;
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143
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144 for _, groupconfig in ipairs(params.groups) do
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145 if groupconfig.admin then
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146 admingroup = groupconfig;
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147 break;
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148 end
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149 end
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150
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151 if admingroup then
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152 params.admin = {
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153 basedn = params.groups.basedn,
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154 namefield = params.groups.memberfield,
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155 filter = group_namefield .. '=' .. admingroup[group_namefield],
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156 };
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157 end
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158 end
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159 end
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160
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161 return ok, err;
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162 end
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163
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164 -- what to do if connection isn't available?
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165 local function connect()
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166 return ldap.open_simple(params.hostname, params.bind_dn, params.bind_password, params.use_tls);
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167 end
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168
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169 -- this is abstracted so we can maintain persistent connections at a later time
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170 function _M.getconnection()
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171 return assert(connect());
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172 end
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173
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174 function _M.getparams()
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175 return params;
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176 end
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177
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178 -- XXX consider renaming this...it doesn't bind the current connection
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179 function _M.bind(username, password)
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180 local conn = _M.getconnection();
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181 local filter = format('%s=%s', params.user.usernamefield, username);
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182
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183 if filter then
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184 filter = _M.filter.combine_and(filter, params.user.filter);
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185 end
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186
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187 local who = _M.singlematch {
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188 attrs = params.user.usernamefield,
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189 base = params.user.basedn,
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190 filter = filter,
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191 };
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192
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193 if who then
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194 who = who.dn;
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195 module:log('debug', '_M.bind - who: %s', who);
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196 else
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197 module:log('debug', '_M.bind - no DN found for username = %s', username);
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198 return nil, format('no DN found for username = %s', username);
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199 end
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200
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201 local conn, err = ldap.open_simple(params.hostname, who, password, params.use_tls);
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202
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203 if conn then
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204 conn:close();
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205 return true;
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206 end
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207
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208 return conn, err;
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209 end
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210
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211 function _M.singlematch(query)
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212 local ld = _M.getconnection();
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213
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214 query.sizelimit = 1;
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215 query.scope = 'subtree';
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216
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217 for dn, attribs in ld:search(query) do
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218 attribs.dn = dn;
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219 return attribs;
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220 end
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221 end
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222
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223 _M.filter = {};
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224
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225 function _M.filter.combine_and(...)
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226 local parts = { '(&' };
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227
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228 local arg = { ... };
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229
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230 for _, filter in ipairs(arg) do
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231 if filter:sub(1, 1) ~= '(' and filter:sub(-1) ~= ')' then
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232 filter = '(' .. filter .. ')'
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233 end
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234 parts[#parts + 1] = filter;
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235 end
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236
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237 parts[#parts + 1] = ')';
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238
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239 return tconcat(parts, '');
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240 end
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241
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242 do
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243 local ok, err;
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244
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245 prosody.unlock_globals();
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246 ok, ldap = pcall(require, 'lualdap');
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247 prosody.lock_globals();
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248 if not ok then
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249 module:log("error", "Failed to load the LuaLDAP library for accessing LDAP: %s", ldap);
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250 module:log("error", "More information on install LuaLDAP can be found at http://www.keplerproject.org/lualdap");
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251 return;
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252 end
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253
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254 if not params then
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255 module:log("error", "LDAP configuration required to use the LDAP storage module");
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256 return;
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257 end
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258
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259 ok, err = validate_config();
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260
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261 if not ok then
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262 module:log("error", "LDAP configuration is invalid: %s", tostring(err));
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263 return;
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264 end
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265 end
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266
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267 return _M;