prosody
3e226e387a67
plugins/mod_auth_internal_hashed.lua

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plugins/mod_auth_internal_hashed.lua @ 6634:3e226e387a67

configure: Mention openbsd preset in --help
author Kim Alvefur <zash@zash.se>
date Sun, 26 Apr 2015 23:23:33 +0200
parent 6019:e9147a16059d
child 6707:06cdd4afaaf9
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 -- Copyright (C) 2010 Jeff Mitchell
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5 --
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6 -- This project is MIT/X11 licensed. Please see the
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7 -- COPYING file in the source package for more information.
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8 --
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9
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10 local max = math.max;
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11
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12 local getAuthenticationDatabaseSHA1 = require "util.sasl.scram".getAuthenticationDatabaseSHA1;
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13 local usermanager = require "core.usermanager";
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14 local generate_uuid = require "util.uuid".generate;
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15 local new_sasl = require "util.sasl".new;
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16
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17 local log = module._log;
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18 local host = module.host;
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19
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20 local accounts = module:open_store("accounts");
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21
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22 local to_hex;
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23 do
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24 local function replace_byte_with_hex(byte)
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25 return ("%02x"):format(byte:byte());
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26 end
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27 function to_hex(binary_string)
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28 return binary_string:gsub(".", replace_byte_with_hex);
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29 end
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30 end
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31
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32 local from_hex;
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33 do
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34 local function replace_hex_with_byte(hex)
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35 return string.char(tonumber(hex, 16));
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36 end
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37 function from_hex(hex_string)
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38 return hex_string:gsub("..", replace_hex_with_byte);
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39 end
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40 end
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41
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42
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43 -- Default; can be set per-user
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44 local default_iteration_count = 4096;
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45
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46 -- define auth provider
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47 local provider = {};
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48
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49 function provider.test_password(username, password)
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50 log("debug", "test password for user '%s'", username);
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51 local credentials = accounts:get(username) or {};
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52
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53 if credentials.password ~= nil and string.len(credentials.password) ~= 0 then
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54 if credentials.password ~= password then
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55 return nil, "Auth failed. Provided password is incorrect.";
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56 end
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57
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58 if provider.set_password(username, credentials.password) == nil then
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59 return nil, "Auth failed. Could not set hashed password from plaintext.";
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60 else
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61 return true;
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62 end
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63 end
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64
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65 if credentials.iteration_count == nil or credentials.salt == nil or string.len(credentials.salt) == 0 then
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66 return nil, "Auth failed. Stored salt and iteration count information is not complete.";
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67 end
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68
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69 local valid, stored_key, server_key = getAuthenticationDatabaseSHA1(password, credentials.salt, credentials.iteration_count);
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70
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71 local stored_key_hex = to_hex(stored_key);
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72 local server_key_hex = to_hex(server_key);
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73
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74 if valid and stored_key_hex == credentials.stored_key and server_key_hex == credentials.server_key then
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75 return true;
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76 else
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77 return nil, "Auth failed. Invalid username, password, or password hash information.";
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78 end
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79 end
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80
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81 function provider.set_password(username, password)
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82 log("debug", "set_password for username '%s'", username);
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83 local account = accounts:get(username);
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84 if account then
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85 account.salt = generate_uuid();
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86 account.iteration_count = max(account.iteration_count or 0, default_iteration_count);
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87 local valid, stored_key, server_key = getAuthenticationDatabaseSHA1(password, account.salt, account.iteration_count);
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88 local stored_key_hex = to_hex(stored_key);
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89 local server_key_hex = to_hex(server_key);
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90
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91 account.stored_key = stored_key_hex
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92 account.server_key = server_key_hex
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93
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94 account.password = nil;
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95 return accounts:set(username, account);
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96 end
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97 return nil, "Account not available.";
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98 end
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99
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100 function provider.user_exists(username)
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101 local account = accounts:get(username);
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102 if not account then
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103 log("debug", "account not found for username '%s'", username);
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104 return nil, "Auth failed. Invalid username";
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105 end
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106 return true;
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107 end
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108
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109 function provider.users()
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110 return accounts:users();
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111 end
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112
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113 function provider.create_user(username, password)
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114 if password == nil then
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115 return accounts:set(username, {});
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116 end
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117 local salt = generate_uuid();
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118 local valid, stored_key, server_key = getAuthenticationDatabaseSHA1(password, salt, default_iteration_count);
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119 local stored_key_hex = to_hex(stored_key);
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120 local server_key_hex = to_hex(server_key);
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121 return accounts:set(username, {stored_key = stored_key_hex, server_key = server_key_hex, salt = salt, iteration_count = default_iteration_count});
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122 end
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123
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124 function provider.delete_user(username)
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125 return accounts:set(username, nil);
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126 end
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127
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128 function provider.get_sasl_handler()
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129 local testpass_authentication_profile = {
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130 plain_test = function(sasl, username, password, realm)
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131 return usermanager.test_password(username, realm, password), true;
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132 end,
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133 scram_sha_1 = function(sasl, username, realm)
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134 local credentials = accounts:get(username);
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135 if not credentials then return; end
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136 if credentials.password then
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137 usermanager.set_password(username, credentials.password, host);
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138 credentials = accounts:get(username);
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139 if not credentials then return; end
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140 end
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141
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142 local stored_key, server_key, iteration_count, salt = credentials.stored_key, credentials.server_key, credentials.iteration_count, credentials.salt;
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143 stored_key = stored_key and from_hex(stored_key);
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144 server_key = server_key and from_hex(server_key);
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145 return stored_key, server_key, iteration_count, salt, true;
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146 end
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147 };
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148 return new_sasl(host, testpass_authentication_profile);
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149 end
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150
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151 module:provides("auth", provider);
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152