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<div><h1 class="title"><a id="id-1"></a>SSL output settings</h1><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.9/docs/copied-from-beats/docs/shared-ssl-config.asciidoc">edit</a></div>
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<div class="position-relative"><h2 class="title"><a id="configuration-ssl"></a>SSL output settings</h2><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.9/docs/copied-from-beats/docs/shared-ssl-config.asciidoc">edit</a></div>
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<p>You can specify SSL options with any output that supports SSL, like Elasticsearch, Logstash, or Kafka.</p>
<p>Example output config with SSL enabled:</p>
<div class="pre_wrapper lang-yaml">
<div class="console_code_copy" title="Copy to clipboard"></div>
<pre class="programlisting prettyprint lang-yaml">output.elasticsearch.hosts: ["https://192.168.1.42:9200"]
output.elasticsearch.ssl.certificate_authorities: ["/etc/pki/root/ca.pem"]
output.elasticsearch.ssl.certificate: "/etc/pki/client/cert.pem"
output.elasticsearch.ssl.key: "/etc/pki/client/cert.key"</pre>
</div>
<p>Also see <a class="xref" href="configuring-ssl-logstash.html" title="Secure communication with Logstash"><em>Secure communication with Logstash</em></a>.</p>
<div class="position-relative"><h4><a id="_configuration_options_8"></a>Configuration options</h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.9/docs/copied-from-beats/docs/shared-ssl-config.asciidoc">edit</a></div>
<p>You can specify the following options in the <code class="literal">ssl</code> section of the <code class="literal">apm-server.yml</code> config file:</p>
<div class="position-relative"><h5><a id="_enabled_8"></a><code class="literal">enabled</code></h5><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.9/docs/copied-from-beats/docs/shared-ssl-config.asciidoc">edit</a></div>
<p>The <code class="literal">enabled</code> setting can be used to disable the ssl configuration by setting
it to <code class="literal">false</code>. The default value is <code class="literal">true</code>.</p>
<div class="note admon">
<div class="icon"></div>
<div class="admon_content">
<p>SSL settings are disabled if either <code class="literal">enabled</code> is set to <code class="literal">false</code> or the
<code class="literal">ssl</code> section is missing.</p>
</div>
</div>
<div class="position-relative"><h5><a id="_certificate_authorities"></a><code class="literal">certificate_authorities</code></h5><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.9/docs/copied-from-beats/docs/shared-ssl-config.asciidoc">edit</a></div>
<p>The list of root certificates for server verifications. 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"><h5><a id="certificate"></a><code class="literal">certificate: "/etc/pki/client/cert.pem"</code></h5><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.9/docs/copied-from-beats/docs/shared-ssl-config.asciidoc">edit</a></div>
<p>The path to the certificate for SSL client authentication. If the certificate
is not specified, client authentication is not available. The connection
might fail if the server requests client authentication. If the SSL server does not
require client authentication, the certificate will be loaded, but not requested or used
by the server.</p>
<p>When this option is configured, the <a class="xref" href="configuration-ssl.html#key" title="key: "/etc/pki/client/cert.key""><code class="literal">key</code></a> option is also required.</p>
<div class="position-relative"><h5><a id="key"></a><code class="literal">key: "/etc/pki/client/cert.key"</code></h5><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.9/docs/copied-from-beats/docs/shared-ssl-config.asciidoc">edit</a></div>
<p>The client certificate key used for client authentication. This option is required if <a class="xref" href="configuration-ssl.html#certificate" title="certificate: "/etc/pki/client/cert.pem""><code class="literal">certificate</code></a> is specified.</p>
<div class="position-relative"><h5><a id="_key_passphrase"></a><code class="literal">key_passphrase</code></h5><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.9/docs/copied-from-beats/docs/shared-ssl-config.asciidoc">edit</a></div>
<p>The passphrase used to decrypt an encrypted key stored in the configured <code class="literal">key</code> file.</p>
<div class="position-relative"><h5><a id="_supported_protocols"></a><code class="literal">supported_protocols</code></h5><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.9/docs/copied-from-beats/docs/shared-ssl-config.asciidoc">edit</a></div>
<p>List of allowed SSL/TLS versions. If SSL/TLS server decides for protocol versions
not configured, the connection will be dropped during or after the handshake. The
setting is a list of allowed protocol versions:
<code class="literal">SSLv3</code>, <code class="literal">TLSv1</code> for TLS version 1.0, <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>.</p>
<p>The default value is <code class="literal">[TLSv1.1, TLSv1.2, TLSv1.3]</code>.</p>
<div class="position-relative"><h5><a id="_verification_mode"></a><code class="literal">verification_mode</code></h5><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.9/docs/copied-from-beats/docs/shared-ssl-config.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">verification_mode</code> is set
to <code class="literal">none</code>, all server host names and certificates are accepted. In this mode,
TLS-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>
<div class="position-relative"><h5><a id="_cipher_suites"></a><code class="literal">cipher_suites</code></h5><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.9/docs/copied-from-beats/docs/shared-ssl-config.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 <a href="https://golang.org/pkg/crypto/tls/" class="ulink" target="_top">default suites</a>
are used (recommended). Note that TLS 1.3 cipher suites are not
individually configurable in Go, so they are not included in this list.</p>
<p>The following cipher suites are available:</p>
<div class="informaltable">
<table border="1" cellpadding="4px">
<colgroup>
<col class="col_1"/>
<col class="col_2"/>
</colgroup>
<thead>
<tr>
<th align="left" valign="top">Cypher</th>
<th align="left" valign="top">Notes</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="top"><p>ECDHE-ECDSA-AES-128-CBC-SHA</p></td>
<td align="left" valign="top"><p></p></td>
</tr>
<tr>
<td align="left" valign="top"><p>ECDHE-ECDSA-AES-128-CBC-SHA256</p></td>
<td align="left" valign="top"><p>TLS 1.2 only. Disabled by default.</p></td>
</tr>
<tr>
<td align="left" valign="top"><p>ECDHE-ECDSA-AES-128-GCM-SHA256</p></td>
<td align="left" valign="top"><p>TLS 1.2 only.</p></td>
</tr>
<tr>
<td align="left" valign="top"><p>ECDHE-ECDSA-AES-256-CBC-SHA</p></td>
<td align="left" valign="top"><p></p></td>
</tr>
<tr>
<td align="left" valign="top"><p>ECDHE-ECDSA-AES-256-GCM-SHA384</p></td>
<td align="left" valign="top"><p>TLS 1.2 only.</p></td>
</tr>
<tr>
<td align="left" valign="top"><p>ECDHE-ECDSA-CHACHA20-POLY1305</p></td>
<td align="left" valign="top"><p>TLS 1.2 only.</p></td>
</tr>
<tr>
<td align="left" valign="top"><p>ECDHE-ECDSA-RC4-128-SHA</p></td>
<td align="left" valign="top"><p>Disabled by default. RC4 not recommended.</p></td>
</tr>
<tr>
<td align="left" valign="top"><p>ECDHE-RSA-3DES-CBC3-SHA</p></td>
<td align="left" valign="top"><p></p></td>
</tr>
<tr>
<td align="left" valign="top"><p>ECDHE-RSA-AES-128-CBC-SHA</p></td>
<td align="left" valign="top"><p></p></td>
</tr>
<tr>
<td align="left" valign="top"><p>ECDHE-RSA-AES-128-CBC-SHA256</p></td>
<td align="left" valign="top"><p>TLS 1.2 only. Disabled by default.</p></td>
</tr>
<tr>
<td align="left" valign="top"><p>ECDHE-RSA-AES-128-GCM-SHA256</p></td>
<td align="left" valign="top"><p>TLS 1.2 only.</p></td>
</tr>
<tr>
<td align="left" valign="top"><p>ECDHE-RSA-AES-256-CBC-SHA</p></td>
<td align="left" valign="top"><p></p></td>
</tr>
<tr>
<td align="left" valign="top"><p>ECDHE-RSA-AES-256-GCM-SHA384</p></td>
<td align="left" valign="top"><p>TLS 1.2 only.</p></td>
</tr>
<tr>
<td align="left" valign="top"><p>ECDHE-RSA-CHACHA20-POLY1205</p></td>
<td align="left" valign="top"><p>TLS 1.2 only.</p></td>
</tr>
<tr>
<td align="left" valign="top"><p>ECDHE-RSA-RC4-128-SHA</p></td>
<td align="left" valign="top"><p>Disabled by default. RC4 not recommended.</p></td>
</tr>
<tr>
<td align="left" valign="top"><p>RSA-3DES-CBC3-SHA</p></td>
<td align="left" valign="top"><p></p></td>
</tr>
<tr>
<td align="left" valign="top"><p>RSA-AES-128-CBC-SHA</p></td>
<td align="left" valign="top"><p></p></td>
</tr>
<tr>
<td align="left" valign="top"><p>RSA-AES-128-CBC-SHA256</p></td>
<td align="left" valign="top"><p>TLS 1.2 only. Disabled by default.</p></td>
</tr>
<tr>
<td align="left" valign="top"><p>RSA-AES-128-GCM-SHA256</p></td>
<td align="left" valign="top"><p>TLS 1.2 only.</p></td>
</tr>
<tr>
<td align="left" valign="top"><p>RSA-AES-256-CBC-SHA</p></td>
<td align="left" valign="top"><p></p></td>
</tr>
<tr>
<td align="left" valign="top"><p>RSA-AES-256-GCM-SHA384</p></td>
<td align="left" valign="top"><p>TLS 1.2 only.</p></td>
</tr>
<tr>
<td align="left" valign="top"><p>RSA-RC4-128-SHA</p></td>
<td align="left" valign="top"><p>Disabled by default. RC4 not recommended.</p></td>
</tr>
</tbody>
</table>
</div>
<p>Here is a list of acronyms used in defining the cipher suites:</p>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
3DES:
Cipher suites using triple DES
</li>
<li class="listitem">
AES-128/256:
Cipher suites using AES with 128/256-bit keys.
</li>
<li class="listitem">
CBC:
Cipher using Cipher Block Chaining as block cipher mode.
</li>
<li class="listitem">
ECDHE:
Cipher suites using Elliptic Curve Diffie-Hellman (DH) ephemeral key exchange.
</li>
<li class="listitem">
ECDSA:
Cipher suites using Elliptic Curve Digital Signature Algorithm for authentication.
</li>
<li class="listitem">
GCM:
Galois/Counter mode is used for symmetric key cryptography.
</li>
<li class="listitem">
RC4:
Cipher suites using RC4.
</li>
<li class="listitem">
RSA:
Cipher suites using RSA.
</li>
<li class="listitem">
SHA, SHA256, SHA384:
Cipher suites using SHA-1, SHA-256 or SHA-384.
</li>
</ul>
</div>
<div class="position-relative"><h5><a id="_curve_types"></a><code class="literal">curve_types</code></h5><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.9/docs/copied-from-beats/docs/shared-ssl-config.asciidoc">edit</a></div>
<p>The list of curve types for ECDHE (Elliptic Curve Diffie-Hellman ephemeral key exchange).</p>
<p>The following elliptic curve types are available:</p>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
P-256
</li>
<li class="listitem">
P-384
</li>
<li class="listitem">
P-521
</li>
<li class="listitem">
X25519
</li>
</ul>
</div>
<div class="position-relative"><h5><a id="_renegotiation"></a><code class="literal">renegotiation</code></h5><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.9/docs/copied-from-beats/docs/shared-ssl-config.asciidoc">edit</a></div>
<p>This configures what types of TLS renegotiation are supported. The valid options
are <code class="literal">never</code>, <code class="literal">once</code>, and <code class="literal">freely</code>. The default value is never.</p>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
<code class="literal">never</code> - Disables renegotiation.
</li>
<li class="listitem">
<code class="literal">once</code> - Allows a remote server to request renegotiation once per connection.
</li>
<li class="listitem">
<code class="literal">freely</code> - Allows a remote server to repeatedly request renegotiation.
</li>
</ul>
</div>
<div class="position-relative"><h5><a id="_ca_sha256"></a><code class="literal">ca_sha256</code></h5><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.9/docs/copied-from-beats/docs/shared-ssl-config.asciidoc">edit</a></div>
<p>This configures a certificate pin that you can use to ensure that a specific certificate is part of the verified chain.</p>
<p>The pin is a base64 encoded string of the SHA-256 of the certificate.</p>
<div class="note admon">
<div class="icon"></div>
<div class="admon_content">
<p>This check is not a replacement for the normal SSL validation, but it adds additional validation.
If this option is used with <code class="literal">verification_mode</code> set to <code class="literal">none</code>, the check will always fail because
it will not receive any verified chains.</p>
</div>
</div>
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