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-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
-- Copyright (C) 2010 Jeff Mitchell
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local getAuthenticationDatabaseSHA1 = require "util.sasl.scram".getAuthenticationDatabaseSHA1;
local usermanager = require "core.usermanager";
local generate_uuid = require "util.uuid".generate;
local new_sasl = require "util.sasl".new;
local log = module._log;
local accounts = module:open_store("accounts");
local to_hex;
do
local function replace_byte_with_hex(byte)
return ("%02x"):format(byte:byte());
end
function to_hex(binary_string)
return binary_string:gsub(".", replace_byte_with_hex);
end
end
local from_hex;
do
local function replace_hex_with_byte(hex)
return string.char(tonumber(hex, 16));
end
function from_hex(hex_string)
return hex_string:gsub("..", replace_hex_with_byte);
end
end
-- Default; can be set per-user
local iteration_count = 4096;
local host = module.host;
-- define auth provider
local provider = {};
function provider.test_password(username, password)
local credentials = accounts:get(username) or {};
if credentials.password ~= nil and string.len(credentials.password) ~= 0 then
if credentials.password ~= password then
return nil, "Auth failed. Provided password is incorrect.";
end
if provider.set_password(username, credentials.password) == nil then
return nil, "Auth failed. Could not set hashed password from plaintext.";
else
return true;
end
end
if credentials.iteration_count == nil or credentials.salt == nil or string.len(credentials.salt) == 0 then
return nil, "Auth failed. Stored salt and iteration count information is not complete.";
end
local valid, stored_key, server_key = getAuthenticationDatabaseSHA1(password, credentials.salt, credentials.iteration_count);
local stored_key_hex = to_hex(stored_key);
local server_key_hex = to_hex(server_key);
if valid and stored_key_hex == credentials.stored_key and server_key_hex == credentials.server_key then
return true;
else
return nil, "Auth failed. Invalid username, password, or password hash information.";
end
end
function provider.set_password(username, password)
local account = accounts:get(username);
if account then
account.salt = account.salt or generate_uuid();
account.iteration_count = account.iteration_count or iteration_count;
local valid, stored_key, server_key = getAuthenticationDatabaseSHA1(password, account.salt, account.iteration_count);
local stored_key_hex = to_hex(stored_key);
local server_key_hex = to_hex(server_key);
account.stored_key = stored_key_hex
account.server_key = server_key_hex
account.password = nil;
return accounts:set(username, account);
end
return nil, "Account not available.";
end
function provider.user_exists(username)
local account = accounts:get(username);
if not account then
log("debug", "account not found for username '%s' at host '%s'", username, host);
return nil, "Auth failed. Invalid username";
end
return true;
end
function provider.users()
return accounts:users();
end
function provider.create_user(username, password)
if password == nil then
return accounts:set(username, {});
end
local salt = generate_uuid();
local valid, stored_key, server_key = getAuthenticationDatabaseSHA1(password, salt, iteration_count);
local stored_key_hex = to_hex(stored_key);
local server_key_hex = to_hex(server_key);
return accounts:set(username, {stored_key = stored_key_hex, server_key = server_key_hex, salt = salt, iteration_count = iteration_count});
end
function provider.delete_user(username)
return accounts:set(username, nil);
end
function provider.get_sasl_handler()
local testpass_authentication_profile = {
plain_test = function(sasl, username, password, realm)
return usermanager.test_password(username, realm, password), true;
end,
scram_sha_1 = function(sasl, username, realm)
local credentials = accounts:get(username);
if not credentials then return; end
if credentials.password then
usermanager.set_password(username, credentials.password, host);
credentials = accounts:get(username);
if not credentials then return; end
end
local stored_key, server_key, iteration_count, salt = credentials.stored_key, credentials.server_key, credentials.iteration_count, credentials.salt;
stored_key = stored_key and from_hex(stored_key);
server_key = server_key and from_hex(server_key);
return stored_key, server_key, iteration_count, salt, true;
end
};
return new_sasl(host, testpass_authentication_profile);
end
module:provides("auth", provider);
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