From 22da44fce9ca198d9115e2852e6f9a0183e56886 Mon Sep 17 00:00:00 2001 From: Matt Caswell Date: Thu, 1 Feb 2018 17:40:17 +0000 Subject: [PATCH] Document SSL_OP_ENABLE_MIDDLEBOX_COMPAT Reviewed-by: Rich Salz (Merged from https://github.com/openssl/openssl/pull/5237) --- doc/man3/SSL_CTX_set_options.pod | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/doc/man3/SSL_CTX_set_options.pod b/doc/man3/SSL_CTX_set_options.pod index ba9a95f3a7..0d510773cd 100644 --- a/doc/man3/SSL_CTX_set_options.pod +++ b/doc/man3/SSL_CTX_set_options.pod @@ -189,6 +189,15 @@ those clients (e.g. mobile) use ChaCha20-Poly1305 if that cipher is anywhere in the server cipher list; but still allows other clients to use AES and other ciphers. Requires B. +=item SSL_OP_ENABLE_MIDDLEBOX_COMPAT + +If set then dummy Change Cipher Spec (CCS) messages are sent in TLSv1.3. This +has the effect of making TLSv1.3 look more like TLSv1.2 so that middleboxes that +do not understand TLSv1.3 will not drop the connection. Regardless of whether +this option is set or not CCS messages received from the peer will always be +ignored in TLSv1.3. This option is set by default. To switch it off use +SSL_clear_options(). A future version of OpenSSL may not set this by default. + =back The following options no longer have any effect but their identifiers are -- 2.25.1