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<p>You are viewing the documentation for a prerelease version.</p>
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<ul>
<li class="crumb"><a href="../../index.html">Cassandra</a></li>
<li class="crumb"><a href="mtlsauthenticators.html">Getting started with mTLS authenticators</a></li>
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<li class="tool edit"><a href="https://github.com/apache/cassandra/edit/cassandra-5.0/doc/modules/cassandra/pages/getting-started/mtlsauthenticators.adoc" title="Edit Page" target="_blank" rel="noopener">Edit</a></li>
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</div>
<article class="doc">
<h1 class="page">Getting started with mTLS authenticators</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>When a certificate based authentication protocol like TLS is used for client and
Internode connections, <code>MutualTlsAuthenticator</code> &amp; <code>MutualTlsInternodeAuthenticator</code>
can be used for the authentication by leveraging the client certificates from the
SSL handshake.</p>
</div>
<div class="paragraph">
<p>After SSL handshake, identity from the client certificates is extracted and only
authorized users will be granted access.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="what-is-an-identity"><a class="anchor" href="#what-is-an-identity"></a>What is an Identity</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Operators can define their own identity for certificates by extracting some fields or
information from the certificates. Implementing the interface <code>MutualTlsCertificateValidator</code>
supports validating &amp; extracting identities from the certificates that can be used by
<code>MutualTlsAuthenticator</code> and <code>MutualTlsInternodeAuthenticator</code> to customize for the
certificate conventions used in the deployment environment.</p>
</div>
<div class="paragraph">
<p>There is a default implementation of <code>MutualTlsCertificateValidator</code> with
<a href="https://spiffe.io/docs/latest/spiffe-about/spiffe-concepts/">SPIFFE</a> as the identity
of the certificates.This requires spiffe to be present in the SAN of the certificate.</p>
</div>
<div class="paragraph">
<p>Instead of using <code>SPIFFE</code> based validator, a custom <code>CN</code> based validator that implements <code>MutualTlsCertificateValidator</code>
could be configured by the operator if required.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="configuring-mtls-authenticator-for-client-connections"><a class="anchor" href="#configuring-mtls-authenticator-for-client-connections"></a>Configuring mTLS authenticator for client connections</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Note that the following steps uses SPIFFE identity as an example, If you are using
a custom validator, use appropriate identity in place of <code>spiffe://testdomain.com/testIdentifier/testValue</code>.</p>
</div>
<div class="paragraph">
<p><strong>STEP 1: Add authorized users to system_auth.identity_to_roles table</strong></p>
</div>
<div class="paragraph">
<p>Note that only users with permissions to create/modify roles can add/remove identities.
Client certificates with the identities in this table will be trusted by C*.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-plaintext hljs" data-lang="plaintext">ADD IDENTITY 'spiffe://testdomain.com/testIdentifier/testValue' TO ROLE 'read_only_user'</code></pre>
</div>
</div>
<div class="paragraph">
<p><strong>STEP 2: Configure Cassandra.yaml with right properties</strong></p>
</div>
<div class="paragraph">
<p><code>client_encryption_options</code> configuration for mTLS connections</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-plaintext hljs" data-lang="plaintext">client_encryption_options:
enabled: true
optional: false
keystore: conf/.keystore
keystore_password: cassandra
truststore: conf/.truststore
truststore_password: cassandra
require_client_auth: true // to enable mTLS</code></pre>
</div>
</div>
<div class="paragraph">
<p>Configure mTLS authenticator and the validator for client connections . If you are
implementing a custom validator, use that instead of Spiffe validator</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-plaintext hljs" data-lang="plaintext">authenticator:
class_name : org.apache.cassandra.auth.MutualTlsAuthenticator
parameters :
validator_class_name: org.apache.cassandra.auth.SpiffeCertificateValidator</code></pre>
</div>
</div>
<div class="paragraph">
<p><strong>STEP 3: Bounce the cluster</strong></p>
</div>
<div class="paragraph">
<p>After the bounce, C* will accept mTLS connections from the clients and if their
identity is present in the <code>identity_to_roles</code> table, access will be granted.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="configuring-mtls-authenticator-for-internode-connections"><a class="anchor" href="#configuring-mtls-authenticator-for-internode-connections"></a>Configuring mTLS authenticator for Internode connections</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Internode authenticator trusts certificates whose identities are present in
<code>internode_authenticator.parameters.trusted_peer_identities</code> if configured.</p>
</div>
<div class="paragraph">
<p>Otherwise, it trusts connections which have the same identity as the node.
When a node is making an outbound connection to another node, it uses the
certificate configured in <code>server_encryption_options.outbound_keystore</code>.
During the start of the node, identity is extracted from the outbound keystore and
connections from other nodes who have the same identity will be trusted if
<code>trusted_peer_identities</code> is not configured.</p>
</div>
<div class="paragraph">
<p>For example, if a node has <code>testIdentity</code> embedded in the certificate in
outbound keystore, It trusts connections from other nodes when their certificates
have <code>testIdentity</code> embedded in them.</p>
</div>
<div class="paragraph">
<p>There is an optional configuration <code>node_identity</code> that can be used to verify identity
extracted from the keystore to avoid any configuration errors.</p>
</div>
<div class="paragraph">
<p><strong>STEP 1: Configure server_encryption_options in cassandra.yaml</strong></p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-plaintext hljs" data-lang="plaintext">server_encryption_options:
internode_encryption: all
optional: true
keystore: conf/.keystore
keystore_password: cassandra
outbound_keystore: conf/.outbound_keystore
outbound_keystore_password: cassandra
require_client_auth: true // for enabling mTLS
truststore: conf/.truststore
truststore_password: cassandra</code></pre>
</div>
</div>
<div class="paragraph">
<p><strong>STEP 2: Configure Internode Authenticator and Validator</strong></p>
</div>
<div class="paragraph">
<p>Configure mTLS Internode authenticator and validator. If you are
implementing a custom validator, use that instead of Spiffe validator</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-plaintext hljs" data-lang="plaintext">internode_authenticator:
class_name : org.apache.cassandra.auth.MutualTlsInternodeAuthenticator
parameters :
validator_class_name: org.apache.cassandra.auth.SpiffeCertificateValidator
trusted_peer_identities : "spiffe1,spiffe2"</code></pre>
</div>
</div>
<div class="paragraph">
<p><strong>STEP 3: Bounce the cluster</strong>
Once all nodes in the cluster are restarted, all internode communications will be authenticated by mTLS.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="migration-from-existing-password-based-authentication"><a class="anchor" href="#migration-from-existing-password-based-authentication"></a>Migration from existing password based authentication</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>For client connections, since the migration will not happen overnight,
the operators can run cassandra in optional mTLS mode and use
<code>MutualTlsWithPasswordFallbackAuthenticator</code> which will accept both mTLS &amp; password
based connections, based on the type of connection client is making. These settings
can be configured in <code>cassandra.yaml</code>. Once all the clients migrate to using mTLS,
turn off optional mode and set the authenticator to be <code>MutualTlsAuthenticator</code>. From
that point only mTLS client connections will be accepted.</p>
</li>
<li>
<p>For Internode connections, while doing rolling upgrades from non-mTLS based configuration
to mTLS based configuration, set <code>server_encryption_options.optional:true</code> for the new nodes to
be able to connect to old nodes which are still using non-mTLS based configuration during upgrade.
After this, change the internode authenticator to be <code>MutualTlsInternodeAuthenticator</code> and turn off the optional
mode by setting <code>server_encryption_options.optional:false</code>.</p>
</li>
</ul>
</div>
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