[gnutls-devel] GnuTLS | tls1.3: server returns early on handshake when no cert is provided by client (!711)

[Development of GNU's TLS library]

Nikos Mavrogiannopoulos commented on a discussion on lib/handshake-tls13.c:

> +	_gnutls_write_uint24(session->security_parameters.prf->output_size, finished+1);
> +
> +	ret = _gnutls_buffer_append_data(&session->internals.handshake_hash_buffer, finished,
> +					 TLS_HANDSHAKE_HEADER_SIZE+session->security_parameters.prf->output_size);
> +	if (ret < 0)
> +		return gnutls_assert_val(ret);
> +
> +	ret = _tls13_derive_secret(session, RMS_MASTER_LABEL, sizeof(RMS_MASTER_LABEL)-1,
> +				   session->internals.handshake_hash_buffer.data,
> +				   session->internals.handshake_hash_buffer.length,
> +				   session->key.proto.tls13.temp_secret,
> +				   session->key.proto.tls13.ap_rms);
> +	if (ret < 0)
> +		return gnutls_assert_val(ret);
> +
> +	session->internals.handshake_hash_buffer.length = spos;

What is the trace you are thinking of? I see that the failure in derive secret is fatal (as opposed to returning EAGAIN), so it will lead to the handshake being canceled anyway.

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