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<a href="https://gitlab.com/dkg">Daniel Kahn Gillmor</a> created an issue: <a href="https://gitlab.com/gnutls/gnutls/-/issues/1238">#1238</a>
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<p dir="auto">Consider a certtool template that contains one of the <a href="https://csrc.nist.gov/CSRC/media/Projects/Computer-Security-Objects-Register/documents/test_policy.pdf" rel="nofollow noreferrer noopener" target="_blank">NIST test policies</a>:</p>
<pre class="code highlight js-syntax-highlight language-plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">policy1 = 2.16.840.1.101.3.2.1.48.1</span></code></pre>
<p dir="auto">but doesn't contain either <code>policy1_txt</code> or <code>policy1_url</code>.</p>
<p dir="auto">In this case, <code>certtool</code> embeds an x509v3 certificatePolicies (2.5.29.32) extension with the value <code>3010300E060A608648016503020130013000</code>, which unpacks to:</p>
<pre class="code highlight js-syntax-highlight language-plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext"> 0 16: SEQUENCE {</span>
<span id="LC2" class="line" lang="plaintext"> 2 14: SEQUENCE {</span>
<span id="LC3" class="line" lang="plaintext"> 4 10: OBJECT IDENTIFIER nistTestPolicy1 (2 16 840 1 101 3 2 1 48 1)</span>
<span id="LC4" class="line" lang="plaintext"> 16 0: SEQUENCE {}</span>
<span id="LC5" class="line" lang="plaintext"> : }</span>
<span id="LC6" class="line" lang="plaintext"> : }</span></code></pre>
<p dir="auto">RFC 3280 defines this structure as a <code>certificatePolicies</code> structure:</p>
<pre class="code highlight js-syntax-highlight language-plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext"> certificatePolicies ::= SEQUENCE SIZE (1..MAX) OF PolicyInformation</span>
<span id="LC2" class="line" lang="plaintext"></span>
<span id="LC3" class="line" lang="plaintext"> PolicyInformation ::= SEQUENCE {</span>
<span id="LC4" class="line" lang="plaintext"> policyIdentifier CertPolicyId,</span>
<span id="LC5" class="line" lang="plaintext"> policyQualifiers SEQUENCE SIZE (1..MAX) OF</span>
<span id="LC6" class="line" lang="plaintext"> PolicyQualifierInfo OPTIONAL }</span>
<span id="LC7" class="line" lang="plaintext"></span>
<span id="LC8" class="line" lang="plaintext"> CertPolicyId ::= OBJECT IDENTIFIER</span>
<span id="LC9" class="line" lang="plaintext"></span>
<span id="LC10" class="line" lang="plaintext"> PolicyQualifierInfo ::= SEQUENCE {</span>
<span id="LC11" class="line" lang="plaintext"> policyQualifierId PolicyQualifierId,</span>
<span id="LC12" class="line" lang="plaintext"> qualifier ANY DEFINED BY policyQualifierId }</span></code></pre>
<p dir="auto">The final empty sequence (starting at octet 16) is the <code>policyQualifiers</code> object. This object is optional. But if it is present, it is a sequence of at least size 1.</p>
<p dir="auto">If there are no qualifiers, <code>certtool</code> should instead omit the <code>policyQualifiers</code> sequence entirely, rather than emitting it as an empty sequence.</p>
<p dir="auto">This was caught by <a href="https://github.com/dcooper16/cert_check" rel="nofollow noreferrer noopener" target="_blank">David Cooper's cert_check</a>.</p>
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