File

plugins/mod_auth_internal_hashed.lua @ 11928:16cf863b36c0

mod_csi_simple: Skip initiating flush in all but inactive state Both in the flushing and active states the right thing to do is skip directly to returning the data. Also in any unknown state, like if the filter is somehow left behind on module unload.
author Kim Alvefur <zash@zash.se>
date Sat, 20 Nov 2021 23:54:43 +0100
parent 11560:3bbb1af92514
child 12127:baa7cdde69a6
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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.to, hex.from;
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 = 4096;

-- 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;
		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'", 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);
	return accounts:set(username, {
		stored_key = stored_key_hex, server_key = server_key_hex,
		salt = salt, iteration_count = default_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(_, 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);