prosody
d58925bb74ca
plugins/mod_auth_internal_hashed.lua

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plugins/mod_auth_internal_hashed.lua @ 10219:d58925bb74ca

mod_auth_internal_hashed: Precompute SCRAM authentication profile name (thanks MattJ)
author Kim Alvefur <zash@zash.se>
date Thu, 22 Aug 2019 01:00:31 +0200
parent 10218:e458578ddfd3
child 10563:e8db377a2983
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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
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19 local log = module._log;
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20 local host = module.host;
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22 local accounts = module:open_store("accounts");
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24 local hash_name = module:get_option_string("password_hash", "SHA-1");
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25 local get_auth_db = assert(scram_hashers[hash_name], "SCRAM-"..hash_name.." not supported by SASL library");
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26 local scram_name = "scram_"..hash_name:gsub("%-","_"):lower();
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27
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28 -- Default; can be set per-user
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29 local default_iteration_count = 4096;
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31 -- define auth provider
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32 local provider = {};
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34 function provider.test_password(username, password)
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35 log("debug", "test password for user '%s'", username);
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36 local credentials = accounts:get(username) or {};
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37
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38 if credentials.password ~= nil and string.len(credentials.password) ~= 0 then
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39 if credentials.password ~= password then
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40 return nil, "Auth failed. Provided password is incorrect.";
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41 end
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42
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43 if provider.set_password(username, credentials.password) == nil then
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44 return nil, "Auth failed. Could not set hashed password from plaintext.";
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45 else
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46 return true;
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47 end
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48 end
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49
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50 if credentials.iteration_count == nil or credentials.salt == nil or string.len(credentials.salt) == 0 then
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51 return nil, "Auth failed. Stored salt and iteration count information is not complete.";
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52 end
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53
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54 local valid, stored_key, server_key = get_auth_db(password, credentials.salt, credentials.iteration_count);
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56 local stored_key_hex = to_hex(stored_key);
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57 local server_key_hex = to_hex(server_key);
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58
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59 if valid and stored_key_hex == credentials.stored_key and server_key_hex == credentials.server_key then
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60 return true;
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61 else
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62 return nil, "Auth failed. Invalid username, password, or password hash information.";
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63 end
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64 end
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65
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66 function provider.set_password(username, password)
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67 log("debug", "set_password for username '%s'", username);
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68 local account = accounts:get(username);
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69 if account then
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70 account.salt = generate_uuid();
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71 account.iteration_count = max(account.iteration_count or 0, default_iteration_count);
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72 local valid, stored_key, server_key = get_auth_db(password, account.salt, account.iteration_count);
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73 local stored_key_hex = to_hex(stored_key);
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74 local server_key_hex = to_hex(server_key);
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75
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76 account.stored_key = stored_key_hex
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77 account.server_key = server_key_hex
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78
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79 account.password = nil;
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80 return accounts:set(username, account);
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81 end
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82 return nil, "Account not available.";
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83 end
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84
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85 function provider.user_exists(username)
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86 local account = accounts:get(username);
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87 if not account then
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88 log("debug", "account not found for username '%s'", username);
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89 return nil, "Auth failed. Invalid username";
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90 end
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91 return true;
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92 end
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93
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94 function provider.users()
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95 return accounts:users();
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96 end
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97
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98 function provider.create_user(username, password)
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99 if password == nil then
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100 return accounts:set(username, {});
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101 end
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102 local salt = generate_uuid();
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103 local valid, stored_key, server_key = get_auth_db(password, salt, default_iteration_count);
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104 local stored_key_hex = to_hex(stored_key);
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105 local server_key_hex = to_hex(server_key);
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106 return accounts:set(username, {
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107 stored_key = stored_key_hex, server_key = server_key_hex,
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108 salt = salt, iteration_count = default_iteration_count
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109 });
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110 end
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111
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112 function provider.delete_user(username)
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113 return accounts:set(username, nil);
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114 end
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115
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116 function provider.get_sasl_handler()
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117 local testpass_authentication_profile = {
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Kim Alvefur <zash@zash.se>
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118 plain_test = function(_, username, password, realm)
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119 return usermanager.test_password(username, realm, password), true;
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parents: 4764
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120 end,
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121 [scram_name] = function(_, username)
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122 local credentials = accounts:get(username);
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123 if not credentials then return; end
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parents: 4764
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124 if credentials.password then
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Kim Alvefur <zash@zash.se>
parents: 8056
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125 if provider.set_password(username, credentials.password) == nil then
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126 return nil, "Auth failed. Could not set hashed password from plaintext.";
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parents: 8056
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127 end
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128 credentials = accounts:get(username);
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129 if not credentials then return; end
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parents: 4764
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130 end
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Florian Zeitz <florob@babelmonkeys.de>
parents: 5500
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131
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Kim Alvefur <zash@zash.se>
parents: 8055
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132 local stored_key, server_key = credentials.stored_key, credentials.server_key;
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Kim Alvefur <zash@zash.se>
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133 local iteration_count, salt = credentials.iteration_count, credentials.salt;
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parents: 4764
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134 stored_key = stored_key and from_hex(stored_key);
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parents: 4764
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135 server_key = server_key and from_hex(server_key);
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parents: 4764
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136 return stored_key, server_key, iteration_count, salt, true;
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parents: 4764
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137 end
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parents: 4764
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138 };
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parents: 4764
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139 return new_sasl(host, testpass_authentication_profile);
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parents: 4764
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140 end
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Florian Zeitz <florob@babelmonkeys.de>
parents: 5500
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141
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Waqas Hussain <waqas20@gmail.com>
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142 module:provides("auth", provider);
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parents: 4764
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143