--- a/plugins/mod_tls.lua Fri Sep 17 21:18:30 2021 +0200
+++ b/plugins/mod_tls.lua Sat Apr 02 11:18:57 2022 +0200
@@ -129,6 +129,13 @@
module:hook("stanza/urn:ietf:params:xml:ns:xmpp-tls:starttls", function(event)
local origin = event.origin;
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();