-- Prosody IM

-- Copyright (C) 2008-2010 Matthew Wild

-- Copyright (C) 2008-2010 Waqas Hussain

-- 

-- This project is MIT/X11 licensed. Please see the

-- COPYING file in the source package for more information.

--

local configmanager = require "core.configmanager";

local log = require "util.logger".init("certmanager");

local ssl = ssl;

local ssl_newcontext = ssl and ssl.newcontext;

local setmetatable, tostring = setmetatable, tostring;

local prosody = prosody;

local resolve_path = configmanager.resolve_relative_path;

local config_path = prosody.paths.config;

local luasec_major, luasec_minor = ssl._VERSION:match("^(%d+)%.(%d+)");

module "certmanager"

-- Global SSL options if not overridden per-host

local default_ssl_config = configmanager.get("*", "core", "ssl");

local default_capath = "/etc/ssl/certs";

local default_verify = (ssl and ssl.x509 and { "peer", "client_once", "continue", "ignore_purpose" }) or "none";

local default_options = { "no_sslv2", luasec_has_noticket and "no_ticket" or nil };

function create_context(host, mode, user_ssl_config)

	user_ssl_config = user_ssl_config or default_ssl_config;

	if not ssl then return nil, "LuaSec (required for encryption) was not found"; end

	if not user_ssl_config then return nil, "No SSL/TLS configuration present for "..host; end

	local ssl_config = {

		mode = mode;

		protocol = user_ssl_config.protocol or "sslv23";

		key = resolve_path(config_path, user_ssl_config.key);

		password = user_ssl_config.password or function() log("error", "Encrypted certificate for %s requires 'ssl' 'password' to be set in config", host); end;

		certificate = resolve_path(config_path, user_ssl_config.certificate);

		capath = resolve_path(config_path, user_ssl_config.capath or default_capath);

		cafile = resolve_path(config_path, user_ssl_config.cafile);

		verify = user_ssl_config.verify or default_verify;

		options = user_ssl_config.options or default_options;

		depth = user_ssl_config.depth;

	};

	local ctx, err = ssl_newcontext(ssl_config);

	-- LuaSec ignores the cipher list from the config, so we have to take care

	-- of it ourselves (W/A for #x)

	if ctx and user_ssl_config.ciphers then

		local success;

		success, err = ssl.context.setcipher(ctx, user_ssl_config.ciphers);

		if not success then ctx = nil; end

	end

	if not ctx then

		err = err or "invalid ssl config"

		local file = err:match("^error loading (.-) %(");

		if file then

			if file == "private key" then

				file = ssl_config.key or "your private key";

			elseif file == "certificate" then

				file = ssl_config.certificate or "your certificate file";

			end

			local reason = err:match("%((.+)%)$") or "some reason";

			if reason == "Permission denied" then

				reason = "Check that the permissions allow Prosody to read this file.";

			elseif reason == "No such file or directory" then

				reason = "Check that the path is correct, and the file exists.";

			elseif reason == "system lib" then

				reason = "Previous error (see logs), or other system error.";

			elseif reason == "(null)" or not reason then

				reason = "Check that the file exists and the permissions are correct";

			else

				reason = "Reason: "..tostring(reason):lower();

			end

			log("error", "SSL/TLS: Failed to load %s: %s (for %s)", file, reason, host);

		else

			log("error", "SSL/TLS: Error initialising for %s: %s", host, err);

		end

	end

	return ctx, err;

end

function reload_ssl_config()

	default_ssl_config = configmanager.get("*", "core", "ssl");

end

prosody.events.add_handler("config-reloaded", reload_ssl_config);

return _M;