-- Prosody IM

-- Copyright (C) 2008-2009 Matthew Wild

-- Copyright (C) 2008-2009 Waqas Hussain

-- 

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

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

--

local st = require "util.stanza";

local xmlns_stream = 'http://etherx.jabber.org/streams';

local xmlns_starttls = 'urn:ietf:params:xml:ns:xmpp-tls';

local secure_auth_only = module:get_option("c2s_require_encryption") or module:get_option("require_encryption");

local secure_s2s_only = module:get_option("s2s_require_encryption");

local global_ssl_ctx = prosody.global_ssl_ctx;

module:hook("stanza/urn:ietf:params:xml:ns:xmpp-tls:starttls", function(event)

	local origin = event.origin;

	if origin.conn.starttls and origin.type == "c2s_unauthed" or origin.type == "s2sin_unauthed" then

		(origin.sends2s or origin.send)(st.stanza("proceed", { xmlns = xmlns_starttls }));

		origin:reset_stream();

		local host = origin.to_host or origin.host;

		local ssl_ctx = host and hosts[host].ssl_ctx_in or global_ssl_ctx;

		origin.conn:starttls(ssl_ctx);

		origin.log("info", "TLS negotiation started for %s...", origin.type);

		origin.secure = false;

	else

		origin.log("warn", "Attempt to start TLS, but TLS is not available on this %s connection", origin.type);

	end

	return true;

end);

local starttls_attr = { xmlns = xmlns_starttls };

module:add_event_hook("stream-features", 

		function (session, features)

			if not session.username and session.conn.starttls then

				features:tag("starttls", starttls_attr);

				if secure_auth_only then

					features:tag("required"):up():up();

				else

					features:up();

				end

			end

		end);

module:hook("s2s-stream-features", 

		function (data)

			local session, features = data.session, data.features;

			if session.to_host and session.type ~= "s2sin" and session.conn.starttls then

				features:tag("starttls", starttls_attr):up();

				if secure_s2s_only then

					features:tag("required"):up():up();

				else

					features:up();

				end

			end

		end);

-- For s2sout connections, start TLS if we can

module:hook_stanza(xmlns_stream, "features",

		function (session, stanza)

			module:log("debug", "Received features element");

			if session.conn.starttls and stanza:child_with_ns(xmlns_starttls) then

				module:log("%s is offering TLS, taking up the offer...", session.to_host);

				session.sends2s("<starttls xmlns='"..xmlns_starttls.."'/>");

				return true;

			end

		end, 500);

module:hook_stanza(xmlns_starttls, "proceed",

		function (session, stanza)

			module:log("debug", "Proceeding with TLS on s2sout...");

			session:reset_stream();

			local ssl_ctx = session.from_host and hosts[session.from_host].ssl_ctx or global_ssl_ctx;

			session.conn:starttls(ssl_ctx, true);

			session.secure = false;

			return true;

		end);