annotate mod_auth_wordpress/mod_auth_wordpress.lua @ 426:6f2e37d0a1b0

mod_auth_wordpress: Allow table prefix to be configured
author Kim Alvefur <zash@zash.se>
date Sun, 11 Sep 2011 22:53:23 +0200
parents 34eb9df9e37f
children 35b3ea156156
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1 -- Wordpress authentication backend for Prosody
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2 --
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3 -- Copyright (C) 2011 Waqas Hussain
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4 --
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5
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6 local log = require "util.logger".init("auth_sql");
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7 local new_sasl = require "util.sasl".new;
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8 local nodeprep = require "util.encodings".stringprep.nodeprep;
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9 local saslprep = require "util.encodings".stringprep.saslprep;
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10 local DBI = require "DBI"
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11 local md5 = require "util.hashes".md5;
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12 local uuid_gen = require "util.uuid".generate;
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13
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14 local connection;
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15 local params = module:get_option("sql");
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16 local table_prefix = module:get_option_string("wordpress_table_prefix", "wp_");
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17
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18 local resolve_relative_path = require "core.configmanager".resolve_relative_path;
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19
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20 local function test_connection()
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21 if not connection then return nil; end
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22 if connection:ping() then
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23 return true;
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24 else
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25 module:log("debug", "Database connection closed");
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26 connection = nil;
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27 end
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28 end
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29 local function connect()
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30 if not test_connection() then
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31 prosody.unlock_globals();
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32 local dbh, err = DBI.Connect(
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33 params.driver, params.database,
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34 params.username, params.password,
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35 params.host, params.port
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36 );
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37 prosody.lock_globals();
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38 if not dbh then
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39 module:log("debug", "Database connection failed: %s", tostring(err));
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40 return nil, err;
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41 end
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42 module:log("debug", "Successfully connected to database");
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43 dbh:autocommit(true); -- don't run in transaction
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44 connection = dbh;
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45 return connection;
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46 end
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47 end
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48
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49 do -- process options to get a db connection
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50 params = params or { driver = "SQLite3" };
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51
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52 if params.driver == "SQLite3" then
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53 params.database = resolve_relative_path(prosody.paths.data or ".", params.database or "prosody.sqlite");
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54 end
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55
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56 assert(params.driver and params.database, "Both the SQL driver and the database need to be specified");
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57
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58 assert(connect());
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59 end
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60
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61 local function getsql(sql, ...)
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62 if params.driver == "PostgreSQL" then
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63 sql = sql:gsub("`", "\"");
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64 end
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65 if not test_connection() then connect(); end
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66 -- do prepared statement stuff
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67 local stmt, err = connection:prepare(sql);
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68 if not stmt and not test_connection() then error("connection failed"); end
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69 if not stmt then module:log("error", "QUERY FAILED: %s %s", err, debug.traceback()); return nil, err; end
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70 -- run query
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71 local ok, err = stmt:execute(...);
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72 if not ok and not test_connection() then error("connection failed"); end
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73 if not ok then return nil, err; end
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74
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75 return stmt;
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76 end
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77 local function setsql(sql, ...)
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78 local stmt, err = getsql(sql, ...);
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79 if not stmt then return stmt, err; end
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80 return stmt:affected();
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81 end
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82
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83 local function get_password(username)
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84 local stmt, err = getsql("SELECT `user_pass` FROM `"..table_prefix.."users` WHERE `user_login`=?", username);
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85 if stmt then
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86 for row in stmt:rows(true) do
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87 return row.user_password;
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88 end
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89 end
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90 end
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91
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92
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93 local itoa64 = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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94 local function hashEncode64(input, count)
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95 local output = "";
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96 local i, value = 0, 0;
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97
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98 while true do
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99 value = input:byte(i+1)
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100 i = i+1;
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101 local idx = value % 0x40 + 1;
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102 output = output .. itoa64:sub(idx, idx);
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103
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104 if i < count then
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105 value = value + input:byte(i+1) * 256;
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106 end
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107 local _ = value % (2^6);
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108 local idx = ((value - _) / (2^6)) % 0x40 + 1
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109 output = output .. itoa64:sub(idx, idx);
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110
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111 if i >= count then break; end
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112 i = i+1;
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113
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114 if i < count then
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115 value = value + input:byte(i+1) * 256 * 256;
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116 end
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117 local _ = value % (2^12);
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118 local idx = ((value - _) / (2^12)) % 0x40 + 1
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119 output = output .. itoa64:sub(idx, idx);
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120
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121 if i >= count then break; end
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122 i = i+1;
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123
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124 local _ = value % (2^18);
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125 local idx = ((value - _) / (2^18)) % 0x40 + 1
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126 output = output .. itoa64:sub(idx, idx);
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127
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128 if not(i < count) then break; end
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129 end
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130 return output;
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131 end
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132 local function hashCryptPrivate(password, genSalt)
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133 local output = "*";
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134 if not genSalt:match("^%$P%$") then return output; end
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135
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parents:
diff changeset
136 local count_log2 = itoa64:find(genSalt:sub(4,4)) - 1;
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parents:
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137 if count_log2 < 7 or count_log2 > 30 then return output; end
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parents:
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138
81c7b36e6cdd mod_auth_phpbb3: Initial commit.
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139 local count = 2 ^ count_log2;
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140 local salt = genSalt:sub(5, 12);
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141
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142 if #salt ~= 8 then return output; end
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143
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144 local hash = md5(salt..password);
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145
81c7b36e6cdd mod_auth_phpbb3: Initial commit.
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146 while true do
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147 hash = md5(hash..password);
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148 if not(count > 1) then break; end
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parents:
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149 count = count-1;
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150 end
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151
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152 output = genSalt:sub(1, 12);
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153 output = output .. hashEncode64(hash, 16);
373
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154
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155 return output;
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156 end
377
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157 local function hashGensaltPrivate(input)
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158 local iteration_count_log2 = 6;
425
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159 local output = "$P$";
377
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160 local idx = math.min(iteration_count_log2 + 5, 30) + 1;
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161 output = output .. itoa64:sub(idx, idx);
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162 output = output .. hashEncode64(input, 6);
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163 return output;
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164 end
424
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165 local function wordpressCheckHash(password, hash)
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166 if #hash == 32 then return hash == md5(password, true); end
377
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167 return #hash == 34 and hashCryptPrivate(password, hash) == hash;
373
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168 end
424
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169 local function wordpressCreateHash(password)
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170 local random = uuid_gen():sub(-6);
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171 local salt = hashGensaltPrivate(random);
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172 local hash = hashCryptPrivate(password, salt);
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173 if #hash == 34 then return hash; end
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174 return md5(password, true);
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175 end
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176
373
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177
423
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diff changeset
178 provider = { name = "wordpress" };
373
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179
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180 function provider.test_password(username, password)
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181 local hash = get_password(username);
424
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182 return hash and wordpressCheckHash(password, hash);
373
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parents:
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183 end
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Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
184 function provider.user_exists(username)
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parents:
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185 module:log("debug", "test user %s existence", username);
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186 return get_password(username) and true;
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187 end
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188
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189 function provider.get_password(username)
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190 return nil, "Getting password is not supported.";
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191 end
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192 function provider.set_password(username, password)
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193 local hash = wordpressCreateHash(password);
426
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194 local stmt, err = setsql("UPDATE `"..table_prefix.."users` SET `user_pass`=? WHERE `user_login`=?", hash, username);
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diff changeset
195 return stmt and true, err;
373
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196 end
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Waqas Hussain <waqas20@gmail.com>
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197 function provider.create_user(username, password)
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198 return nil, "Account creation/modification not supported.";
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199 end
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200
419
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diff changeset
201 local escapes = {
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202 [" "] = "\\20";
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203 ['"'] = "\\22";
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204 ["&"] = "\\26";
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parents: 377
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205 ["'"] = "\\27";
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206 ["/"] = "\\2f";
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parents: 377
diff changeset
207 [":"] = "\\3a";
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parents: 377
diff changeset
208 ["<"] = "\\3c";
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parents: 377
diff changeset
209 [">"] = "\\3e";
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parents: 377
diff changeset
210 ["@"] = "\\40";
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parents: 377
diff changeset
211 ["\\"] = "\\5c";
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parents: 377
diff changeset
212 };
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diff changeset
213 local unescapes = {};
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parents: 377
diff changeset
214 for k,v in pairs(escapes) do unescapes[v] = k; end
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diff changeset
215 local function jid_escape(s) return s and (s:gsub(".", escapes)); end
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diff changeset
216 local function jid_unescape(s) return s and (s:gsub("\\%x%x", unescapes)); end
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diff changeset
217
373
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218 function provider.get_sasl_handler()
419
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219 local sasl = {};
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diff changeset
220 function sasl:clean_clone() return provider.get_sasl_handler(); end
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diff changeset
221 function sasl:mechanisms() return { PLAIN = true; }; end
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parents: 377
diff changeset
222 function sasl:select(mechanism)
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parents: 377
diff changeset
223 if not self.selected and mechanism == "PLAIN" then
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224 self.selected = mechanism;
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diff changeset
225 return true;
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diff changeset
226 end
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parents: 377
diff changeset
227 end
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diff changeset
228 function sasl:process(message)
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parents: 377
diff changeset
229 if not message then return "failure", "malformed-request"; end
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parents: 377
diff changeset
230 local authorization, authentication, password = message:match("^([^%z]*)%z([^%z]+)%z([^%z]+)");
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parents: 377
diff changeset
231 if not authorization then return "failure", "malformed-request"; end
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diff changeset
232 authentication = saslprep(authentication);
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233 password = saslprep(password);
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parents: 377
diff changeset
234 if (not password) or (password == "") or (not authentication) or (authentication == "") then
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parents: 377
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235 return "failure", "malformed-request", "Invalid username or password.";
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236 end
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diff changeset
237 local function test(authentication)
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238 local prepped = nodeprep(authentication);
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parents: 377
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239 local normalized = jid_unescape(prepped);
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240 return normalized and provider.test_password(normalized, password) and prepped;
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diff changeset
241 end
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parents: 377
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242 local username = test(authentication) or test(jid_escape(authentication));
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parents: 377
diff changeset
243 if username then
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244 self.username = username;
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parents: 377
diff changeset
245 return "success";
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parents: 377
diff changeset
246 end
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parents: 377
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247 return "failure", "not-authorized", "Unable to authorize you with the authentication credentials you've sent.";
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diff changeset
248 end
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parents: 377
diff changeset
249 return sasl;
373
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250 end
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251
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252 module:add_item("auth-provider", provider);
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parents:
diff changeset
253