plugins/mod_auth_internal_hashed.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2010 Matthew Wild
   3 -- Copyright (C) 2008-2010 Waqas Hussain
   4 -- Copyright (C) 2010 Jeff Mitchell
   5 --
   6 -- This project is MIT/X11 licensed. Please see the
   7 -- COPYING file in the source package for more information.
   8 --
   9
  10 local datamanager = require "util.datamanager";
  11 local log = require "util.logger".init("auth_internal_hashed");
  12 local type = type;
  13 local error = error;
  14 local ipairs = ipairs;
  15 local hashes = require "util.hashes";
  16 local jid_bare = require "util.jid".bare;
  17 local getAuthenticationDatabaseSHA1 = require "util.sasl.scram".getAuthenticationDatabaseSHA1;
  18 local config = require "core.configmanager";
  19 local usermanager = require "core.usermanager";
  20 local generate_uuid = require "util.uuid".generate;
  21 local new_sasl = require "util.sasl".new;
  22 local nodeprep = require "util.encodings".stringprep.nodeprep;
  23 local hosts = hosts;
  24
  25 -- COMPAT w/old trunk: remove these two lines before 0.8 release
  26 local hmac_sha1 = require "util.hmac".sha1;
  27 local sha1 = require "util.hashes".sha1;
  28
  29 local to_hex;
  30 do
  31         local function replace_byte_with_hex(byte)
  32                 return ("%02x"):format(byte:byte());
  33         end
  34         function to_hex(binary_string)
  35                 return binary_string:gsub(".", replace_byte_with_hex);
  36         end
  37 end
  38
  39 local from_hex;
  40 do
  41         local function replace_hex_with_byte(hex)
  42                 return string.char(tonumber(hex, 16));
  43         end
  44         function from_hex(hex_string)
  45                 return hex_string:gsub("..", replace_hex_with_byte);
  46         end
  47 end
  48
  49
  50 local prosody = _G.prosody;
  51
  52 -- Default; can be set per-user
  53 local iteration_count = 4096;
  54
  55 function new_hashpass_provider(host)
  56         local provider = { name = "internal_hashed" };
  57         log("debug", "initializing hashpass authentication provider for host '%s'", host);
  58
  59         function provider.test_password(username, password)
  60                 local credentials = datamanager.load(username, host, "accounts") or {};
  61
  62                 if credentials.password ~= nil and string.len(credentials.password) ~= 0 then
  63                         if credentials.password ~= password then
  64                                 return nil, "Auth failed. Provided password is incorrect.";
  65                         end
  66
  67                         if provider.set_password(username, credentials.password) == nil then
  68                                 return nil, "Auth failed. Could not set hashed password from plaintext.";
  69                         else
  70                                 return true;
  71                         end
  72                 end
  73
  74                 if credentials.iteration_count == nil or credentials.salt == nil or string.len(credentials.salt) == 0 then
  75                         return nil, "Auth failed. Stored salt and iteration count information is not complete.";
  76                 end
  77
  78                 -- convert hexpass to stored_key and server_key
  79                 -- COMPAT w/old trunk: remove before 0.8 release
  80                 if credentials.hashpass then
  81                         local salted_password = from_hex(credentials.hashpass);
  82                         credentials.stored_key = sha1(hmac_sha1(salted_password, "Client Key"), true);
  83                         credentials.server_key = to_hex(hmac_sha1(salted_password, "Server Key"));
  84                         credentials.hashpass = nil
  85                         datamanager.store(username, host, "accounts", credentials);
  86                 end
  87
  88                 local valid, stored_key, server_key = getAuthenticationDatabaseSHA1(password, credentials.salt, credentials.iteration_count);
  89
  90                 local stored_key_hex = to_hex(stored_key);
  91                 local server_key_hex = to_hex(server_key);
  92
  93                 if valid and stored_key_hex == credentials.stored_key and server_key_hex == credentials.server_key then
  94                         return true;
  95                 else
  96                         return nil, "Auth failed. Invalid username, password, or password hash information.";
  97                 end
  98         end
  99
 100         function provider.set_password(username, password)
 101                 local account = datamanager.load(username, host, "accounts");
 102                 if account then
 103                         account.salt = account.salt or generate_uuid();
 104                         account.iteration_count = account.iteration_count or iteration_count;
 105                         local valid, stored_key, server_key = getAuthenticationDatabaseSHA1(password, account.salt, account.iteration_count);
 106                         local stored_key_hex = to_hex(stored_key);
 107                         local server_key_hex = to_hex(server_key);
 108
 109                         account.stored_key = stored_key_hex
 110                         account.server_key = server_key_hex
 111
 112                         account.password = nil;
 113                         return datamanager.store(username, host, "accounts", account);
 114                 end
 115                 return nil, "Account not available.";
 116         end
 117
 118         function provider.user_exists(username)
 119                 local account = datamanager.load(username, host, "accounts");
 120                 if not account then
 121                         log("debug", "account not found for username '%s' at host '%s'", username, module.host);
 122                         return nil, "Auth failed. Invalid username";
 123                 end
 124                 return true;
 125         end
 126
 127         function provider.create_user(username, password)
 128                 if password == nil then
 129                         return datamanager.store(username, host, "accounts", {});
 130                 end
 131                 local salt = generate_uuid();
 132                 local valid, stored_key, server_key = getAuthenticationDatabaseSHA1(password, salt, iteration_count);
 133                 local stored_key_hex = to_hex(stored_key);
 134                 local server_key_hex = to_hex(server_key);
 135                 return datamanager.store(username, host, "accounts", {stored_key = stored_key_hex, server_key = server_key_hex, salt = salt, iteration_count = iteration_count});
 136         end
 137
 138         function provider.get_sasl_handler()
 139                 local realm = module:get_option("sasl_realm") or module.host;
 140                 local testpass_authentication_profile = {
 141                         plain_test = function(username, password, realm)
 142                                 local prepped_username = nodeprep(username);
 143                                 if not prepped_username then
 144                                         log("debug", "NODEprep failed on username: %s", username);
 145                                         return "", nil;
 146                                 end
 147                                 return usermanager.test_password(prepped_username, realm, password), true;
 148                         end,
 149                         scram_sha_1 = function(username, realm)
 150                                 local credentials = datamanager.load(username, host, "accounts");
 151                                 if not credentials then return; end
 152                                 if credentials.password then
 153                                         usermanager.set_password(username, credentials.password, host);
 154                                         credentials = datamanager.load(username, host, "accounts");
 155                                         if not credentials then return; end
 156                                 end
 157
 158                                 -- convert hexpass to stored_key and server_key
 159                                 -- COMPAT w/old trunk: remove before 0.8 release
 160                                 if credentials.hashpass then
 161                                         local salted_password = from_hex(credentials.hashpass);
 162                                         credentials.stored_key = sha1(hmac_sha1(salted_password, "Client Key"), true);
 163                                         credentials.server_key = to_hex(hmac_sha1(salted_password, "Server Key"));
 164                                         credentials.hashpass = nil
 165                                         datamanager.store(username, host, "accounts", credentials);
 166                                 end
 167
 168                                 local stored_key, server_key, iteration_count, salt = credentials.stored_key, credentials.server_key, credentials.iteration_count, credentials.salt;
 169                                 stored_key = stored_key and from_hex(stored_key);
 170                                 server_key = server_key and from_hex(server_key);
 171                                 return stored_key, server_key, iteration_count, salt, true;
 172                         end
 173                 };
 174                 return new_sasl(realm, testpass_authentication_profile);
 175         end
 176
 177         return provider;
 178 end
 179
 180 module:add_item("auth-provider", new_hashpass_provider(module.host));
 181