prosody
56ceb6c1bc50
plugins/mod_auth_internal_hashed.lua

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plugins/mod_auth_internal_hashed.lua @ 11284:56ceb6c1bc50

mod_mam: Workaround scansion test flakyness The empty ID fields are sometimes accepted, sometimes not.
author Kim Alvefur <zash@zash.se>
date Wed, 13 Jan 2021 16:26:56 +0100
parent 10916:c7ed8f754033
child 11560:3bbb1af92514
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 scram_hashers = require "util.sasl.scram".hashers;
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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 local hex = require"util.hex";
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17 local to_hex, from_hex = hex.to, hex.from;
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18 local saslprep = require "util.encodings".stringprep.saslprep;
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19
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20 local log = module._log;
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21 local host = module.host;
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22
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23 local accounts = module:open_store("accounts");
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25 local hash_name = module:get_option_string("password_hash", "SHA-1");
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26 local get_auth_db = assert(scram_hashers[hash_name], "SCRAM-"..hash_name.." not supported by SASL library");
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27 local scram_name = "scram_"..hash_name:gsub("%-","_"):lower();
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28
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29 -- Default; can be set per-user
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30 local default_iteration_count = 4096;
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32 -- define auth provider
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33 local provider = {};
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34
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35 function provider.test_password(username, password)
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36 log("debug", "test password for user '%s'", username);
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37 local credentials = accounts:get(username) or {};
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38 password = saslprep(password);
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39 if not password then
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40 return nil, "Password fails SASLprep.";
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41 end
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42
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43 if credentials.password ~= nil and string.len(credentials.password) ~= 0 then
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44 if saslprep(credentials.password) ~= password then
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45 return nil, "Auth failed. Provided password is incorrect.";
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46 end
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47
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48 if provider.set_password(username, credentials.password) == nil then
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49 return nil, "Auth failed. Could not set hashed password from plaintext.";
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50 else
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51 return true;
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52 end
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53 end
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54
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55 if credentials.iteration_count == nil or credentials.salt == nil or string.len(credentials.salt) == 0 then
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56 return nil, "Auth failed. Stored salt and iteration count information is not complete.";
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57 end
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58
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59 local valid, stored_key, server_key = get_auth_db(password, credentials.salt, credentials.iteration_count);
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60
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61 local stored_key_hex = to_hex(stored_key);
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62 local server_key_hex = to_hex(server_key);
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63
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64 if valid and stored_key_hex == credentials.stored_key and server_key_hex == credentials.server_key then
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65 return true;
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66 else
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67 return nil, "Auth failed. Invalid username, password, or password hash information.";
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68 end
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69 end
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70
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71 function provider.set_password(username, password)
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72 log("debug", "set_password for username '%s'", username);
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73 local account = accounts:get(username);
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74 if account then
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75 account.salt = generate_uuid();
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76 account.iteration_count = max(account.iteration_count or 0, default_iteration_count);
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77 local valid, stored_key, server_key = get_auth_db(password, account.salt, account.iteration_count);
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78 if not valid then
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79 return valid, stored_key;
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80 end
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81 local stored_key_hex = to_hex(stored_key);
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82 local server_key_hex = to_hex(server_key);
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83
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84 account.stored_key = stored_key_hex
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85 account.server_key = server_key_hex
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86
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87 account.password = nil;
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88 return accounts:set(username, account);
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89 end
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90 return nil, "Account not available.";
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91 end
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92
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93 function provider.user_exists(username)
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94 local account = accounts:get(username);
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95 if not account then
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96 log("debug", "account not found for username '%s'", username);
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97 return nil, "Auth failed. Invalid username";
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98 end
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99 return true;
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100 end
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101
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102 function provider.users()
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103 return accounts:users();
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104 end
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105
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106 function provider.create_user(username, password)
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107 if password == nil then
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108 return accounts:set(username, {});
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109 end
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110 local salt = generate_uuid();
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111 local valid, stored_key, server_key = get_auth_db(password, salt, default_iteration_count);
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112 if not valid then
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113 return valid, stored_key;
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114 end
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115 local stored_key_hex = to_hex(stored_key);
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116 local server_key_hex = to_hex(server_key);
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117 return accounts:set(username, {
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118 stored_key = stored_key_hex, server_key = server_key_hex,
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119 salt = salt, iteration_count = default_iteration_count
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120 });
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121 end
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122
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123 function provider.delete_user(username)
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124 return accounts:set(username, nil);
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125 end
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126
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127 function provider.get_sasl_handler()
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128 local testpass_authentication_profile = {
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129 plain_test = function(_, username, password, realm)
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130 return usermanager.test_password(username, realm, password), true;
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131 end,
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132 [scram_name] = function(_, username)
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133 local credentials = accounts:get(username);
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134 if not credentials then return; end
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135 if credentials.password then
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136 if provider.set_password(username, credentials.password) == nil then
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137 return nil, "Auth failed. Could not set hashed password from plaintext.";
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138 end
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139 credentials = accounts:get(username);
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140 if not credentials then return; end
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141 end
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142
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143 local stored_key, server_key = credentials.stored_key, credentials.server_key;
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144 local iteration_count, salt = credentials.iteration_count, credentials.salt;
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145 stored_key = stored_key and from_hex(stored_key);
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146 server_key = server_key and from_hex(server_key);
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147 return stored_key, server_key, iteration_count, salt, true;
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148 end
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149 };
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150 return new_sasl(host, testpass_authentication_profile);
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151 end
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152
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153 module:provides("auth", provider);
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154