[gnutls-devel] GnuTLS | Forbid uncolicited CompressedCertificate messages (!1678)

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Thu Dec 8 13:34:39 CET 2022

Zoltán Fridrich commented on a discussion on lib/tls13/certificate.c: https://gitlab.com/gnutls/gnutls/-/merge_requests/1678#note_1201592308

>  		return gnutls_assert_val(ret);
>  	comp_method = _gnutls_compress_certificate_num2method(method_num);
> +	if (!_gnutls_compress_certificate_is_method_enabled(session, comp_method))
> +		return gnutls_assert_val(GNUTLS_E_ILLEGAL_PARAMETER);

On uncompressed_length mismatch the bad_certificate alert is sent. I fail to see the problem here.

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