# AWS::MSK::ServerlessCluster ClientAuthentication

## Syntax

To declare this entity in your AWS CloudFormation template, use the following syntax:

### JSON

<pre>
{
    "<a href="#sasl" title="Sasl">Sasl</a>" : <i><a href="sasl.md">Sasl</a></i>
}
</pre>

### YAML

<pre>
<a href="#sasl" title="Sasl">Sasl</a>: <i><a href="sasl.md">Sasl</a></i>
</pre>

## Properties

#### Sasl

_Required_: Yes

_Type_: <a href="sasl.md">Sasl</a>

_Update requires_: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)