GnuTLS | Client Authentication broken with Java 17.0.17+ (and recent versions of Java) (#1842)

Romain Tartière created an issue: https://gitlab.com/gnutls/gnutls/-/work_items/1842



## Description of problem:

A few months ago, after a regular package update on our Debian systems from openjdk-17 (17.0.16+8-1 -> 17.0.17~5ea-1), our monitoring system stopped receiving logs from all our log clients (logs sent by a C program) but kept receiving metrics (from the same node) sent by our metric clients (metrics sent by a ruby program).

Both systems are suing the same mTLS certificates to authenticate clients against the server.  The ruby clients where fine, but the C client could not establish a TLS connection because handshake systematically failed.

After reverting the java package to the previous version (17.0.17~5ea-1 -> 17.0.16+8-1), everything was working back as expected.

## More context

Thanks to some git-bisect, the commit in openjdk that break authentication has been identified and is:

https://github.com/openjdk/jdk17u/commit/fe850da38a3fc0c9ce6cf9348efca3c846e97143

It relates to this issue:

https://bugs.openjdk.org/browse/JDK-8349583

Other versions of openjdk which include this change also trigger the issue with GnuTLS (tested with openjdk 21 and a few other versions).

## Version of gnutls used:

Our production systems use the version of GnuTLS packaged in Debian (libgnutls30:amd64 3.7.9-2+deb12u6).

The issue has also been reproduced on FreeBSD with the latest version of GnuTLS.

## Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)

System packages from Debian and FreeBSD.

## How reproducible:

Steps to Reproduce:

 * Setup a java service that offer mTLS authentication;
 * Use a GnuTLS client that rely on `gnutls_certificate_set_x509_key_file()` to setup client-side TLS key and certificate;
 * Attempt to connect with different versions of Java.

## Actual results:

Handshake fails when using a version of Java that include the above code (newer versions of Java) but succeeds with older versions of Java.

## Expected results:

Handshake should succeed regardless of the version of Java used.

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