+
+module:add_event_hook("stream-features",
+ function (session, features)
+ if 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);
+---
+
+-- Stop here if the user doesn't want to allow s2s encryption
+if module:get_option("s2s_allow_encryption") == false then
+ return;
+end
+
+--- Server-to-server TLS handling
+module:add_handler("s2sin_unauthed", "starttls", xmlns_starttls,
+ function (session, stanza)
+ if session.conn.starttls and host.ssl_ctx_in then
+ session.sends2s(st.stanza("proceed", starttls_attr));
+ session:reset_stream();
+ if session.to_host and hosts[session.to_host].ssl_ctx_in then
+ session.conn.set_sslctx(hosts[session.to_host].ssl_ctx_in);
+ end
+ session.conn.starttls();
+ session.log("info", "TLS negotiation started for incoming s2s...");
+ session.secure = false;
+ else
+ session.log("warn", "Attempt to start TLS, but TLS is not available on this s2s connection");
+ (session.sends2s or session.send)(st.stanza("failure", starttls_attr));
+ session:close();
+ end
+ end);
+
+
+module:hook("s2s-stream-features",
+ function (data)
+ local session, features = data.session, data.features;
+ if session.to_host and session.conn.starttls then
+ features:tag("starttls", starttls_attr);
+ 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...");
+ local format, to_host, from_host = string.format, session.to_host, session.from_host;
+ local ssl_ctx = session.from_host and hosts[session.from_host].ssl_ctx or global_ssl_ctx;
+ session.conn.set_sslctx(ssl_ctx);
+ session:reset_stream();
+ session.conn.starttls(true);
+ session.secure = false;
+ return true;
+ end);