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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 create_context = require "prosody.core.certmanager".create_context;
local rawgetopt = require"prosody.core.configmanager".rawget;
local st = require "prosody.util.stanza";
local c2s_require_encryption = module:get_option("c2s_require_encryption", module:get_option("require_encryption", true));
local s2s_require_encryption = module:get_option("s2s_require_encryption", true);
local allow_s2s_tls = module:get_option("s2s_allow_encryption") ~= false;
local s2s_secure_auth = module:get_option("s2s_secure_auth");
if s2s_secure_auth and s2s_require_encryption == false then
module:log("warn", "s2s_secure_auth implies s2s_require_encryption, but s2s_require_encryption is set to false");
s2s_require_encryption = true;
end
local xmlns_starttls = 'urn:ietf:params:xml:ns:xmpp-tls';
local starttls_attr = { xmlns = xmlns_starttls };
local starttls_initiate= st.stanza("starttls", starttls_attr);
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 hosts = prosody.hosts;
local host = hosts[module.host];
local ssl_ctx_c2s, ssl_ctx_s2sout, ssl_ctx_s2sin;
local ssl_cfg_c2s, ssl_cfg_s2sout, ssl_cfg_s2sin;
local err_c2s, err_s2sin, err_s2sout;
function module.load(reload)
local NULL = {};
local modhost = module.host;
local parent = modhost:match("%.(.*)$");
local parent_ssl = rawgetopt(parent, "ssl") or NULL;
local host_ssl = rawgetopt(modhost, "ssl") or parent_ssl;
local global_c2s = rawgetopt("*", "c2s_ssl") or NULL;
local parent_c2s = rawgetopt(parent, "c2s_ssl") or NULL;
local host_c2s = rawgetopt(modhost, "c2s_ssl") or parent_c2s;
local global_s2s = rawgetopt("*", "s2s_ssl") or NULL;
local parent_s2s = rawgetopt(parent, "s2s_ssl") or NULL;
local host_s2s = rawgetopt(modhost, "s2s_ssl") or parent_s2s;
module:log("debug", "Creating context for c2s");
local request_client_certs = { verify = { "peer", "client_once", }; };
local xmpp_alpn = { alpn = "xmpp-server" };
ssl_ctx_c2s, err_c2s, ssl_cfg_c2s = create_context(host.host, "server", host_c2s, host_ssl, global_c2s); -- for incoming client connections
if not ssl_ctx_c2s then module:log("error", "Error creating context for c2s: %s", err_c2s); end
module:log("debug", "Creating context for s2sout");
-- for outgoing server connections
ssl_ctx_s2sout, err_s2sout, ssl_cfg_s2sout = create_context(host.host, "client", host_s2s, host_ssl, global_s2s, request_client_certs, xmpp_alpn);
if not ssl_ctx_s2sout then module:log("error", "Error creating contexts for s2sout: %s", err_s2sout); end
module:log("debug", "Creating context for s2sin");
-- for incoming server connections
ssl_ctx_s2sin, err_s2sin, ssl_cfg_s2sin = create_context(host.host, "server", host_s2s, host_ssl, global_s2s, request_client_certs);
if not ssl_ctx_s2sin then module:log("error", "Error creating contexts for s2sin: %s", err_s2sin); end
if reload then
module:log("info", "Certificates reloaded");
else
module:log("info", "Certificates loaded");
end
end
module:hook_global("config-reloaded", module.load);
local function can_do_tls(session)
if session.secure then
return false;
end
if session.conn and not session.conn.starttls then
if not session.secure then
session.log("debug", "Underlying connection does not support STARTTLS");
end
return false;
elseif session.ssl_ctx ~= nil then
return session.ssl_ctx;
end
if session.type == "c2s_unauthed" then
if not ssl_ctx_c2s and c2s_require_encryption then
session.log("error", "No TLS context available for c2s. Earlier error was: %s", err_c2s);
end
session.ssl_ctx = ssl_ctx_c2s;
session.ssl_cfg = ssl_cfg_c2s;
elseif session.type == "s2sin_unauthed" and allow_s2s_tls then
if not ssl_ctx_s2sin and s2s_require_encryption then
session.log("error", "No TLS context available for s2sin. Earlier error was: %s", err_s2sin);
end
session.ssl_ctx = ssl_ctx_s2sin;
session.ssl_cfg = ssl_cfg_s2sin;
elseif session.direction == "outgoing" and allow_s2s_tls then
if not ssl_ctx_s2sout and s2s_require_encryption then
session.log("error", "No TLS context available for s2sout. Earlier error was: %s", err_s2sout);
end
session.ssl_ctx = ssl_ctx_s2sout;
session.ssl_cfg = ssl_cfg_s2sout;
else
session.log("debug", "Unknown session type, don't know which TLS context to use");
return false;
end
if not session.ssl_ctx then
session.log("debug", "Should be able to do TLS but no context available");
return false;
end
return session.ssl_ctx;
end
module:hook("s2sout-created", function (event)
-- Initialize TLS context for outgoing connections
can_do_tls(event.session);
end);
-- Hook <starttls/>
module:hook("stanza/urn:ietf:params:xml:ns:xmpp-tls:starttls", function(event)
local origin = event.origin;
origin.starttls = "requested";
if can_do_tls(origin) then
if origin.conn.block_reads then
-- we need to ensure that no data is read anymore, otherwise we could end up in a situation where
-- <proceed/> is sent and the socket receives the TLS handshake (and passes the data to lua) before
-- it is asked to initiate TLS
-- (not with the classical single-threaded server backends)
origin.conn:block_reads()
end
(origin.sends2s or origin.send)(starttls_proceed);
if origin.destroyed then return end
origin:reset_stream();
origin.conn:starttls(origin.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);
-- Advertise 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_tag("http://etherx.jabber.org/streams", "features", function (session, stanza)
module:log("debug", "Received features element");
if can_do_tls(session) then
if stanza:get_child("starttls", xmlns_starttls) then
module:log("debug", "%s is offering TLS, taking up the offer...", session.to_host);
elseif s2s_require_encryption then
module:log("debug", "%s is *not* offering TLS, trying anyways!", session.to_host);
else
module:log("debug", "%s is not offering TLS", session.to_host);
return;
end
session.starttls = "initiated";
session.sends2s(starttls_initiate);
return true;
end
end, 500);
module:hook("s2sout-authenticate-legacy", function(event)
local session = event.origin;
if s2s_require_encryption and can_do_tls(session) then
session.sends2s(starttls_initiate);
return true;
end
end, 200);
module:hook_tag(xmlns_starttls, "proceed", function (session, stanza) -- luacheck: ignore 212/stanza
if session.type == "s2sout_unauthed" and can_do_tls(session) then
module:log("debug", "Proceeding with TLS on s2sout...");
session:reset_stream();
session.starttls = "proceeding"
session.conn:starttls(session.ssl_ctx, session.to_host);
session.secure = false;
return true;
end
end);
module:hook_tag(xmlns_starttls, "failure", function (session, stanza) -- luacheck: ignore 212/stanza
module:log("warn", "TLS negotiation with %s failed.", session.to_host);
session:close(nil, "TLS negotiation failed");
return false;
end);
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