openssl: do not log excess "TLS app data" lines for TLS 1.3 #3281
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The SSL_CTX_set_msg_callback callback is not just called for the
Handshake or Alert protocols, but also for the raw record header
(SSL3_RT_HEADER) and the decrypted inner record type
(SSL3_RT_INNER_CONTENT_TYPE). Be sure to ignore the latter to avoid
excess debug spam when using `curl -v` against a TLSv1.3-enabled server:
* TLSv1.3 (IN), TLS app data, [no content] (0):
(Following this message, another callback for the decrypted
handshake/alert messages will be be present anyway.)
I agree, 'No content' messages did not prove to be useful. We are still showing the follow up messages so it should be fine. Thanks |
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The SSL_CTX_set_msg_callback callback is not just called for the
Handshake or Alert protocols, but also for the raw record header
(SSL3_RT_HEADER) and the decrypted inner record type
(SSL3_RT_INNER_CONTENT_TYPE). Be sure to ignore the latter to avoid
excess debug spam when using
curl -vagainst a TLSv1.3-enabled server:(Following this message, another callback for the decrypted
handshake/alert messages will be be present anyway.)
Note that
SSL3_RT_HEADERis only defined since 2012 via openssl/openssl@36b5bb6, otherwise thessl_vercheck could have been replaced bycontent_type != SSL3_RT_HEADER.In #2403 (comment), @jay already questioned why this message needs to be logged. For symmetry with ignoring raw record headers, I think dropping the message is a good idea.