Plugin for the SLS 1.x branch to automatically add some hardening features to all S3 buckets in a stack

Usage no npm install needed!

<script type="module">
  import silvermineServerlessPluginHardenS3Buckets from 'https://cdn.skypack.dev/@silvermine/serverless-plugin-harden-s3-buckets';


Serverless Plugin: Harden S3 Buckets

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What is it?

This is a plugin for the Serverless framework that automatically adds some hardening features to S3 buckets in your stack. This removes copy and paste overhead and reduces the opportunity for developers to forget crucial security settings for a bucket.

How do I use it?

There are two steps:

Install the Plugin as a Development Dependency

npm install --save-dev --save-exact @silvermine/serverless-plugin-harden-s3-buckets

Telling Serverless to Use the Plugin

Simply add this plugin to the list of plugins in your serverless.yml file:

   - '@silvermine/serverless-plugin-harden-s3-buckets'

What Will the Plugin Do?

At this time, all it does is add the following block to every one of the S3 buckets in your stack:

   BlockPublicAcls: true
   BlockPublicPolicy: true
   IgnorePublicAcls: true
   RestrictPublicBuckets: true

What if I Want Some of Those Settings false?

This plugin will only add the ones that are missing, so go ahead and define them in your bucket's resource properties as you normally would.

How do I contribute?

We genuinely appreciate external contributions. See our extensive documentation on how to contribute.


This software is released under the MIT license. See the license file for more details.