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<h2><a class="anchor" aria-hidden="true" id="authentication"></a><a href="#authentication" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Authentication</h2>
<p>Pulsar support mutual TLS and Athenz authentication plugins, and these can be used as described
in <a href="/docs/en/2.4.0/security-overview">Security</a>.</p>
<p>It is possible to use a custom authentication mechanism by providing the implementation in the
form of two plugins one for the Client library and the other for the Pulsar Broker to validate
the credentials.</p>
<h3><a class="anchor" aria-hidden="true" id="client-authentication-plugin"></a><a href="#client-authentication-plugin" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Client authentication plugin</h3>
<p>For client library, you will need to implement <code>org.apache.pulsar.client.api.Authentication</code>. This class can then be passed
when creating a Pulsar client:</p>
<pre><code class="hljs css language-java">PulsarClient client = PulsarClient.builder()
    .serviceUrl(<span class="hljs-string">"pulsar://localhost:6650"</span>)
    .authentication(<span class="hljs-keyword">new</span> MyAuthentication())
    .build();
</code></pre>
<p>For reference, there are 2 interfaces to implement on the client side:</p>
<ul>
<li><code>Authentication</code> -&gt; <a href="http://pulsar.apache.org/api/client/2.4.0/org/apache/pulsar/client/api/Authentication.html">http://pulsar.apache.org/api/client/2.4.0/org/apache/pulsar/client/api/Authentication.html</a></li>
<li><code>AuthenticationDataProvider</code> -&gt; <a href="http://pulsar.apache.org/api/client/2.4.0/org/apache/pulsar/client/api/AuthenticationDataProvider.html">http://pulsar.apache.org/api/client/2.4.0/org/apache/pulsar/client/api/AuthenticationDataProvider.html</a></li>
</ul>
<p>This in turn will need to provide the client credentials in the form of <code>org.apache.pulsar.client.api.AuthenticationDataProvider</code>. This will leave
the chance to return different kinds of authentication token for different
type of connection or by passing a certificate chain to use for TLS.</p>
<p>Examples for client authentication providers can be found at:</p>
<ul>
<li>Mutual TLS Auth -- <a href="https://github.com/apache/pulsar/tree/master/pulsar-client/src/main/java/org/apache/pulsar/client/impl/auth">https://github.com/apache/pulsar/tree/master/pulsar-client/src/main/java/org/apache/pulsar/client/impl/auth</a></li>
<li>Athenz -- <a href="https://github.com/apache/pulsar/tree/master/pulsar-client-auth-athenz/src/main/java/org/apache/pulsar/client/impl/auth">https://github.com/apache/pulsar/tree/master/pulsar-client-auth-athenz/src/main/java/org/apache/pulsar/client/impl/auth</a></li>
</ul>
<h3><a class="anchor" aria-hidden="true" id="broker-authentication-plugin"></a><a href="#broker-authentication-plugin" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Broker authentication plugin</h3>
<p>On broker side, we need the corresponding plugin to validate the credentials
passed by the client. Broker can support multiple authentication providers
at the same time.</p>
<p>In <code>conf/broker.conf</code> it's possible to specify a list of valid providers:</p>
<pre><code class="hljs css language-properties"><span class="hljs-comment"># Authentication provider name list, which is comma separated list of class names</span>
<span class="hljs-attr">authenticationProviders</span>=<span class="hljs-string"></span>
</code></pre>
<p>There is one single interface to implement <code>org.apache.pulsar.broker.authentication.AuthenticationProvider</code>:</p>
<pre><code class="hljs css language-java"><span class="hljs-comment">/**
 * Provider of authentication mechanism
 */</span>
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">interface</span> <span class="hljs-title">AuthenticationProvider</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Closeable</span> </span>{

    <span class="hljs-comment">/**
     * Perform initialization for the authentication provider
     *
     * <span class="hljs-doctag">@param</span> config
     *            broker config object
     * <span class="hljs-doctag">@throws</span> IOException
     *             if the initialization fails
     */</span>
    <span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">initialize</span><span class="hljs-params">(ServiceConfiguration config)</span> <span class="hljs-keyword">throws</span> IOException</span>;

    <span class="hljs-comment">/**
     * <span class="hljs-doctag">@return</span> the authentication method name supported by this provider
     */</span>
    <span class="hljs-function">String <span class="hljs-title">getAuthMethodName</span><span class="hljs-params">()</span></span>;

    <span class="hljs-comment">/**
     * Validate the authentication for the given credentials with the specified authentication data
     *
     * <span class="hljs-doctag">@param</span> authData
     *            provider specific authentication data
     * <span class="hljs-doctag">@return</span> the "role" string for the authenticated connection, if the authentication was successful
     * <span class="hljs-doctag">@throws</span> AuthenticationException
     *             if the credentials are not valid
     */</span>
    <span class="hljs-function">String <span class="hljs-title">authenticate</span><span class="hljs-params">(AuthenticationDataSource authData)</span> <span class="hljs-keyword">throws</span> AuthenticationException</span>;

}
</code></pre>
<p>Example for Broker authentication plugins:</p>
<ul>
<li>Mutual TLS -- <a href="https://github.com/apache/pulsar/blob/master/pulsar-broker-common/src/main/java/org/apache/pulsar/broker/authentication/AuthenticationProviderTls.java">https://github.com/apache/pulsar/blob/master/pulsar-broker-common/src/main/java/org/apache/pulsar/broker/authentication/AuthenticationProviderTls.java</a></li>
<li>Athenz -- <a href="https://github.com/apache/pulsar/blob/master/pulsar-broker-auth-athenz/src/main/java/org/apache/pulsar/broker/authentication/AuthenticationProviderAthenz.java">https://github.com/apache/pulsar/blob/master/pulsar-broker-auth-athenz/src/main/java/org/apache/pulsar/broker/authentication/AuthenticationProviderAthenz.java</a></li>
</ul>
<h2><a class="anchor" aria-hidden="true" id="authorization"></a><a href="#authorization" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Authorization</h2>
<p>Authorization is the operation that checks whether a particular &quot;role&quot; or &quot;principal&quot; is
allowed to perform a certain operation.</p>
<p>By default, Pulsar provides an embedded authorization, though it's possible to
configure a different one through a plugin.</p>
<p>To provide a custom provider, one needs to implement the
<code>org.apache.pulsar.broker.authorization.AuthorizationProvider</code> interface, have this class in the
Pulsar broker classpath and configure it in <code>conf/broker.conf</code>:</p>
<pre><code class="hljs css language-properties"><span class="hljs-comment"># Authorization provider fully qualified class-name</span>
<span class="hljs-attr">authorizationProvider</span>=<span class="hljs-string">org.apache.pulsar.broker.authorization.PulsarAuthorizationProvider</span>
</code></pre>
<pre><code class="hljs css language-java"><span class="hljs-comment">/**
 * Provider of authorization mechanism
 */</span>
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">interface</span> <span class="hljs-title">AuthorizationProvider</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Closeable</span> </span>{

    <span class="hljs-comment">/**
     * Perform initialization for the authorization provider
     *
     * <span class="hljs-doctag">@param</span> config
     *            broker config object
     * <span class="hljs-doctag">@param</span> configCache
     *            pulsar zk configuration cache service
     * <span class="hljs-doctag">@throws</span> IOException
     *             if the initialization fails
     */</span>
    <span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">initialize</span><span class="hljs-params">(ServiceConfiguration conf, ConfigurationCacheService configCache)</span> <span class="hljs-keyword">throws</span> IOException</span>;

    <span class="hljs-comment">/**
     * Check if the specified role has permission to send messages to the specified fully qualified topic name.
     *
     * <span class="hljs-doctag">@param</span> topicName
     *            the fully qualified topic name associated with the topic.
     * <span class="hljs-doctag">@param</span> role
     *            the app id used to send messages to the topic.
     */</span>
    <span class="hljs-function">CompletableFuture&lt;Boolean&gt; <span class="hljs-title">canProduceAsync</span><span class="hljs-params">(TopicName topicName, String role,
            AuthenticationDataSource authenticationData)</span></span>;

    <span class="hljs-comment">/**
     * Check if the specified role has permission to receive messages from the specified fully qualified topic name.
     *
     * <span class="hljs-doctag">@param</span> topicName
     *            the fully qualified topic name associated with the topic.
     * <span class="hljs-doctag">@param</span> role
     *            the app id used to receive messages from the topic.
     * <span class="hljs-doctag">@param</span> subscription
     *            the subscription name defined by the client
     */</span>
    <span class="hljs-function">CompletableFuture&lt;Boolean&gt; <span class="hljs-title">canConsumeAsync</span><span class="hljs-params">(TopicName topicName, String role,
            AuthenticationDataSource authenticationData, String subscription)</span></span>;

    <span class="hljs-comment">/**
     * Check whether the specified role can perform a lookup for the specified topic.
     *
     * For that the caller needs to have producer or consumer permission.
     *
     * <span class="hljs-doctag">@param</span> topicName
     * <span class="hljs-doctag">@param</span> role
     * <span class="hljs-doctag">@return</span>
     * <span class="hljs-doctag">@throws</span> Exception
     */</span>
    <span class="hljs-function">CompletableFuture&lt;Boolean&gt; <span class="hljs-title">canLookupAsync</span><span class="hljs-params">(TopicName topicName, String role,
            AuthenticationDataSource authenticationData)</span></span>;

    <span class="hljs-comment">/**
     *
     * Grant authorization-action permission on a namespace to the given client
     *
     * <span class="hljs-doctag">@param</span> namespace
     * <span class="hljs-doctag">@param</span> actions
     * <span class="hljs-doctag">@param</span> role
     * <span class="hljs-doctag">@param</span> authDataJson
     *            additional authdata in json format
     * <span class="hljs-doctag">@return</span> CompletableFuture
     * <span class="hljs-doctag">@completesWith</span> &lt;br/&gt;
     *                IllegalArgumentException when namespace not found&lt;br/&gt;
     *                IllegalStateException when failed to grant permission
     */</span>
    <span class="hljs-function">CompletableFuture&lt;Void&gt; <span class="hljs-title">grantPermissionAsync</span><span class="hljs-params">(NamespaceName namespace, Set&lt;AuthAction&gt; actions, String role,
            String authDataJson)</span></span>;

    <span class="hljs-comment">/**
     * Grant authorization-action permission on a topic to the given client
     *
     * <span class="hljs-doctag">@param</span> topicName
     * <span class="hljs-doctag">@param</span> role
     * <span class="hljs-doctag">@param</span> authDataJson
     *            additional authdata in json format
     * <span class="hljs-doctag">@return</span> CompletableFuture
     * <span class="hljs-doctag">@completesWith</span> &lt;br/&gt;
     *                IllegalArgumentException when namespace not found&lt;br/&gt;
     *                IllegalStateException when failed to grant permission
     */</span>
    <span class="hljs-function">CompletableFuture&lt;Void&gt; <span class="hljs-title">grantPermissionAsync</span><span class="hljs-params">(TopicName topicName, Set&lt;AuthAction&gt; actions, String role,
            String authDataJson)</span></span>;

}

</code></pre>
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/en/2.4.0/security-encryption"><span class="arrow-prev">← </span><span>End-to-End Encryption</span></a><a class="docs-next button" href="/docs/en/2.4.0/client-libraries-java"><span>Java</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#authentication">Authentication</a><ul class="toc-headings"><li><a href="#client-authentication-plugin">Client authentication plugin</a></li><li><a href="#broker-authentication-plugin">Broker authentication plugin</a></li></ul></li><li><a href="#authorization">Authorization</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="copyright">Copyright © 2022 The Apache Software Foundation. All Rights Reserved. Apache, Apache Pulsar and the Apache feather logo are trademarks of The Apache Software Foundation.</section><span><script>
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