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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 max = math.max;
local scram_hashers = require "util.sasl.scram".hashers;
local usermanager = require "core.usermanager";
local generate_uuid = require "util.uuid".generate;
local new_sasl = require "util.sasl".new;
local hex = require"util.hex";
local to_hex, from_hex = hex.encode, hex.decode;
local saslprep = require "util.encodings".stringprep.saslprep;
local secure_equals = require "util.hashes".equals;
local log = module._log;
local host = module.host;
local accounts = module:open_store("accounts");
local hash_name = module:get_option_string("password_hash", "SHA-1");
local get_auth_db = assert(scram_hashers[hash_name], "SCRAM-"..hash_name.." not supported by SASL library");
local scram_name = "scram_"..hash_name:gsub("%-","_"):lower();
-- Default; can be set per-user
local default_iteration_count = module:get_option_number("default_iteration_count", 10000);
-- define auth provider
local provider = {};
function provider.test_password(username, password)
log("debug", "test password for user '%s'", username);
local credentials = accounts:get(username) or {};
password = saslprep(password);
if not password then
return nil, "Password fails SASLprep.";
end
if credentials.password ~= nil and string.len(credentials.password) ~= 0 then
if not secure_equals(saslprep(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 = get_auth_db(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 secure_equals(stored_key_hex, credentials.stored_key) and secure_equals(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)
log("debug", "set_password for username '%s'", username);
local account = accounts:get(username);
if account then
account.salt = generate_uuid();
account.iteration_count = max(account.iteration_count or 0, default_iteration_count);
local valid, stored_key, server_key = get_auth_db(password, account.salt, account.iteration_count);
if not valid then
return valid, stored_key;
end
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;
account.updated = os.time();
return accounts:set(username, account);
end
return nil, "Account not available.";
end
function provider.get_account_info(username)
local account = accounts:get(username);
if not account then return nil, "Account not available"; end
return {
created = account.created;
password_updated = account.updated;
};
end
function provider.user_exists(username)
local account = accounts:get(username);
if not account then
log("debug", "account not found for username '%s'", username);
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 = get_auth_db(password, salt, default_iteration_count);
if not valid then
return valid, stored_key;
end
local stored_key_hex = to_hex(stored_key);
local server_key_hex = to_hex(server_key);
local now = os.time();
return accounts:set(username, {
stored_key = stored_key_hex, server_key = server_key_hex,
salt = salt, iteration_count = default_iteration_count,
created = now, updated = now;
});
end
function provider.delete_user(username)
return accounts:set(username, nil);
end
function provider.get_sasl_handler()
local testpass_authentication_profile = {
plain_test = function(_, username, password, realm)
return usermanager.test_password(username, realm, password), true;
end,
[scram_name] = function(_, username)
local credentials = accounts:get(username);
if not credentials then return; end
if credentials.password then
if provider.set_password(username, credentials.password) == nil then
return nil, "Auth failed. Could not set hashed password from plaintext.";
end
credentials = accounts:get(username);
if not credentials then return; end
end
local stored_key, server_key = credentials.stored_key, credentials.server_key;
local iteration_count, salt = 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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