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-- 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 config = require "core.configmanager";
local create_context = require "core.certmanager".create_context;
local st = require "util.stanza";
local c2s_require_encryption = module:get_option("c2s_require_encryption") or module:get_option("require_encryption");
local s2s_require_encryption = module:get_option("s2s_require_encryption");
local allow_s2s_tls = module:get_option("s2s_allow_encryption") ~= false;
local xmlns_starttls = 'urn:ietf:params:xml:ns:xmpp-tls';
local starttls_attr = { xmlns = xmlns_starttls };
local starttls_proceed = st.stanza("proceed", starttls_attr);
local starttls_failure = st.stanza("failure", starttls_attr);
local c2s_feature = st.stanza("starttls", starttls_attr);
local s2s_feature = st.stanza("starttls", starttls_attr);
if c2s_require_encryption then c2s_feature:tag("required"):up(); end
if s2s_require_encryption then s2s_feature:tag("required"):up(); end
local global_ssl_ctx = prosody.global_ssl_ctx;
local hosts = prosody.hosts;
local host = hosts[module.host];
local function can_do_tls(session)
if session.type == "c2s_unauthed" then
return session.conn.starttls and host.ssl_ctx_in;
elseif session.type == "s2sin_unauthed" and allow_s2s_tls then
return session.conn.starttls and host.ssl_ctx_in;
elseif session.direction == "outgoing" and allow_s2s_tls then
return session.conn.starttls and host.ssl_ctx;
end
return false;
end
-- Hook <starttls/>
module:hook("stanza/urn:ietf:params:xml:ns:xmpp-tls:starttls", function(event)
local origin = event.origin;
if can_do_tls(origin) then
(origin.sends2s or origin.send)(starttls_proceed);
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("debug", "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);
(origin.sends2s or origin.send)(starttls_failure);
origin:close();
end
return true;
end);
-- Advertize stream feature
module:hook("stream-features", function(event)
local origin, features = event.origin, event.features;
if can_do_tls(origin) then
features:add_child(c2s_feature);
end
end);
module:hook("s2s-stream-features", function(event)
local origin, features = event.origin, event.features;
if can_do_tls(origin) then
features:add_child(s2s_feature);
end
end);
-- For s2sout connections, start TLS if we can
module:hook_stanza("http://etherx.jabber.org/streams", "features", function (session, stanza)
module:log("debug", "Received features element");
if can_do_tls(session) and stanza:child_with_ns(xmlns_starttls) then
module:log("debug", "%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);
session.secure = false;
return true;
end);
local function assert_log(ret, err)
if not ret then
module:log("error", "Unable to initialize TLS: %s", err);
end
return ret;
end
function module.load()
local ssl_config = config.rawget(module.host, "ssl");
if not ssl_config then
local base_host = module.host:match("%.(.*)");
ssl_config = config.get(base_host, "ssl");
end
host.ssl_ctx = assert_log(create_context(host.host, "client", ssl_config)); -- for outgoing connections
host.ssl_ctx_in = assert_log(create_context(host.host, "server", ssl_config)); -- for incoming connections
end
function module.unload()
host.ssl_ctx = nil;
host.ssl_ctx_in = nil;
end
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