&quot;, &quot;test&quot;]
not_ipblocks: [&quot;1.2.3.4&quot;]
</code></pre><table class=message-fields><thead><tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr></thead><tbody><tr id=Source-principals><td><code>principals</code></td><td><code>string[]</code></td><td><p>Optional. A list of source peer identities (i.e. service account), which
matches to the &ldquo;source.principal&rdquo; attribute. This field requires mTLS enabled.</p><p>If not set, any principal is allowed.</p></td><td>