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<div><h1 class="title"><a id="id-1"></a>SSL input settings</h1><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.6/docs/ssl-input-settings.asciidoc">edit</a></div>
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<div class="position-relative"><h2 class="title"><a id="agent-server-ssl"></a>SSL input settings</h2><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.6/docs/ssl-input-settings.asciidoc">edit</a></div>
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<p>You can specify the following options in the <code class="literal">apm-server.ssl</code> section of the <code class="literal">apm-server.yml</code> config file.
They apply to SSL/TLS communication between the APM Server and APM Agents.</p>
<div class="position-relative"><h4><a id="_enabled_8"></a><code class="literal">enabled</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.6/docs/ssl-input-settings.asciidoc">edit</a></div>
<p>The <code class="literal">enabled</code> setting can be used to enable the ssl configuration by setting
it to <code class="literal">true</code>. The default value is <code class="literal">false</code>.</p>
<div class="position-relative"><h4><a id="_certificate"></a><code class="literal">certificate</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.6/docs/ssl-input-settings.asciidoc">edit</a></div>
<p>The path to the file containing the certificate for Server authentication.
Required if <code class="literal">apm-server.ssl.enabled</code> is <code class="literal">true</code>.</p>
<div class="position-relative"><h4><a id="_key_2"></a><code class="literal">key</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.6/docs/ssl-input-settings.asciidoc">edit</a></div>
<p>The path to the file containing the Server certificate key.
Required if <code class="literal">apm-server.ssl.enabled</code> is <code class="literal">true</code>.</p>
<div class="position-relative"><h4><a id="_certificate_authorities_2"></a><code class="literal">certificate_authorities</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.6/docs/ssl-input-settings.asciidoc">edit</a></div>
<p>The list of root certificates for verifying client certificates.
If <code class="literal">certificate_authorities</code> is empty or not set, the trusted certificate authorities of the host system are used.</p>
<div class="position-relative"><h4><a id="_key_passphrase_2"></a><code class="literal">key_passphrase</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.6/docs/ssl-input-settings.asciidoc">edit</a></div>
<p>The passphrase used to decrypt an encrypted key stored in the configured <code class="literal">key</code> file.
We recommend saving the <code class="literal">key_passphrase</code> in the APM Server <a class="xref" href="keystore.html" title="Secrets keystore for secure settings">Secrets keystore</a>.</p>
<div class="position-relative"><h4><a id="_supported_protocols_2"></a><code class="literal">supported_protocols</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.6/docs/ssl-input-settings.asciidoc">edit</a></div>
<p>This setting is a list of allowed protocol versions:
<code class="literal">SSLv3</code>, <code class="literal">TLSv1.0</code>, <code class="literal">TLSv1.1</code>, <code class="literal">TLSv1.2</code> and <code class="literal">TLSv1.3</code>. We do not recommend using <code class="literal">SSLv3</code> or <code class="literal">TLSv1.0</code>.
The default value is <code class="literal">[TLSv1.1, TLSv1.2, TLSv1.3]</code>.</p>
<div class="position-relative"><h4><a id="_cipher_suites_2"></a><code class="literal">cipher_suites</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.6/docs/ssl-input-settings.asciidoc">edit</a></div>
<p>The list of cipher suites to use. The first entry has the highest priority.
If this option is omitted, the Go crypto library’s default
suites are used (recommended).</p>
<div class="position-relative"><h4><a id="_curve_types_2"></a><code class="literal">curve_types</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.6/docs/ssl-input-settings.asciidoc">edit</a></div>
<p>The list of curve types for ECDHE (Elliptic Curve Diffie-Hellman ephemeral key exchange).</p>
<div class="position-relative"><h4><a id="_client_authentication"></a><code class="literal">client_authentication</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.6/docs/ssl-input-settings.asciidoc">edit</a></div>
<p>This configures what types of client authentication are supported. The valid options
are <code class="literal">none</code>, <code class="literal">optional</code>, and <code class="literal">required</code>. The default is <code class="literal">optional</code>.
If <code class="literal">certificate_authorities</code> has been specified, this setting will automatically change to <code class="literal">required</code>.</p>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
<code class="literal">none</code> - Disables client authentication.
</li>
<li class="listitem">
<code class="literal">optional</code> - When a client certificate is given, the server will verify it.
</li>
<li class="listitem">
<code class="literal">required</code> - Requires clients to provide a valid certificate.
</li>
</ul>
</div>
<div class="position-relative"><h4><a id="_verification_mode_2"></a><code class="literal">verification_mode</code></h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.6/docs/ssl-input-settings.asciidoc">edit</a></div>
<p>This option controls whether the client verifies server certificates and host
names. Valid values are <code class="literal">none</code> and <code class="literal">full</code>. If <code class="literal">none</code> is used,
SSL-based connections are susceptible to man-in-the-middle attacks. Use this
option for testing only.</p>
<p>The default is <code class="literal">full</code>.</p>
<p>See <a class="xref" href="securing-apm-server.html" title="Securing APM Server">Securing APM Server</a> for more information.</p>
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