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<h2 dir="auto">
<a id="user-content-description-of-problem" class="anchor" href="#description-of-problem" aria-hidden="true"></a>Description of problem:</h2>
<p dir="auto">When server applications use GnuTLS for TLS with server key in a PKCS#11 device, the library should check if the PKCS#11 module supports RSA-PSS or raw-RSA mechanisms before negotiating TLS 1.3 and failing without any mechanisms to try (or blindly trying unsupported mechanisms).</p>
<p dir="auto">Originally reported in: <a href="https://bugzilla.redhat.com/show_bug.cgi?id=1681274" rel="nofollow noreferrer noopener" target="_blank">https://bugzilla.redhat.com/show_bug.cgi?id=1681274</a></p>
<h2 dir="auto">
<a id="user-content-version-of-gnutls-used" class="anchor" href="#version-of-gnutls-used" aria-hidden="true"></a>Version of gnutls used:</h2>
<p dir="auto">3.6.5</p>
<h2 dir="auto">
<a id="user-content-distributor-of-gnutls-eg-ubuntu-fedora-rhel" class="anchor" href="#distributor-of-gnutls-eg-ubuntu-fedora-rhel" aria-hidden="true"></a>Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)</h2>
<p dir="auto">RHEL</p>
<h2 dir="auto">
<a id="user-content-how-reproducible" class="anchor" href="#how-reproducible" aria-hidden="true"></a>How reproducible:</h2>
<p dir="auto">always</p>
<p dir="auto">Steps to Reproduce:</p>
<ul dir="auto">
<li>Prerequisites:
<ul>
<li>PKCS#11 module without RSA-PSS nor raw-RSA mechanisms support.</li>
</ul>
</li>
<li>Run GnuTLS test server (but it should be reproducible with any other server using GnuTLS) using the key in the PKCS#11 device:</li>
</ul>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">gnutls-serv --http --x509certfile="pkcs11:token=SomeDevice;object=cert;type=cert" --x509keyfile="pkcs11:token=SomeDevice;object=key;type=private?pin-value=111111" -d 9</span></code></pre>
<ul dir="auto">
<li>Try to connect to the https port with TLS 1.3 capable client:</li>
</ul>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">wget --no-check-certificate --tries 1 https://localhost:5556/</span></code></pre>
<h2 dir="auto">
<a id="user-content-actual-results" class="anchor" href="#actual-results" aria-hidden="true"></a>Actual results:</h2>
<p dir="auto">TLS 1.3 connection fails without any ciphersuites that could be used:</p>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">|<2>| checking c0.9e (GNUTLS_DHE_RSA_AES_128_CCM) for compatibility</span>
<span id="LC2" class="line" lang="plaintext">|<2>| checking 00.33 (GNUTLS_DHE_RSA_AES_128_CBC_SHA1) for compatibility</span>
<span id="LC3" class="line" lang="plaintext">|<3>| ASSERT: ciphersuites.c[_gnutls_figure_common_ciphersuite]:1587</span>
<span id="LC4" class="line" lang="plaintext">|<3>| ASSERT: handshake.c[_gnutls_server_select_suite]:1079</span>
<span id="LC5" class="line" lang="plaintext">|<3>| ASSERT: handshake.c[read_client_hello]:800</span>
<span id="LC6" class="line" lang="plaintext">|<3>| ASSERT: handshake.c[_gnutls_recv_handshake]:1545</span>
<span id="LC7" class="line" lang="plaintext">|<3>| ASSERT: handshake.c[handshake_server]:3389</span>
<span id="LC8" class="line" lang="plaintext">Error in handshake: No supported cipher suites have been found.</span>
<span id="LC9" class="line" lang="plaintext">|<5>| REC: Sending Alert[2|40] - Handshake failed</span>
<span id="LC10" class="line" lang="plaintext">|<5>| REC[0x55ed12486eb0]: Preparing Packet Alert(21) with length: 2 and min pad: 0</span>
<span id="LC11" class="line" lang="plaintext">|<9>| ENC[0x55ed12486eb0]: cipher: NULL, MAC: MAC-NULL, Epoch: 0</span>
<span id="LC12" class="line" lang="plaintext">|<5>| REC[0x55ed12486eb0]: Sent Packet[1] Alert(21) in epoch 0 and length: 7</span></code></pre>
<h2 dir="auto">
<a id="user-content-expected-results" class="anchor" href="#expected-results" aria-hidden="true"></a>Expected results:</h2>
<p dir="auto">The library should downgrade the TLS version to 1.2 if it can not provide valid signature for TLS 1.3</p>
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