static-site construct will not deploy

[ktwbc]

Description

As of April 2023, the default security on an S3 bucket is to Block Public access. This creates a conflict with the native behavior of the static-site construct which sets a Policy s3:GetObject using AWS:"*" as the Principle. The deployment will fail with an API: Access Denied error when using this with lift and serverless.

How to Reproduce

1

Additional Information

No response

[joconor]

I'm also running into this. 100% fatal issue for the static-website construct

[ktwbc]

single-page-app will work as a workaround for now

[mnapoli]

Thanks for the report, anyone has a good suggestion for a solution/PR?

[joconor]

FYI, it looks like this is Amazon's announcement of the change in default policy: Advanced Notice: Amazon S3 will automatically enable S3 Block Public Access and disable access control lists for all new buckets starting in April 2023

The exact error that occurs is API: s3:PutBucketPolicy Access Denied while creating the webBucketPolicy for the publicly accessible web bucket.

I wish I could suggest a solution, but I'm afraid that at this time, the problem exceeds the limits of my AWS policy/permissions knowledge. Of course, this is a big reason why I use Serverless Framework & serverless-lift.

[peebam]

Workaround : you can disable the BlocPublicPolicy with the PublicAccessBlockConfiguration property of the S3 bucket CloudFormation structure. Use the extension property of your Lift construct :

extensions: {
  bucket: {
    Properties: {
      PublicAccessBlockConfiguration: {
        BlockPublicPolicy: false,
      },
    },
  },
},

[joconor]

@peebam Since the bucket is created by serverless-lift, how do you know the BucketName?

[peebam]

The BuckName property is not mandatory. In this extract of code, we manage the bucket name. I fixed my comment.

[joconor]

@peebam Thanks for that workaround! Looks like that's working

[hacknaked]

Workaround : you can disable the BlocPublicPolicy with the PublicAccessBlockConfiguration property of the S3 bucket CloudFormation structure. Use the extension property of your Lift construct :

extensions: {
  bucket: {
    Properties: {
      PublicAccessBlockConfiguration: {
        BlockPublicPolicy: false,
      },
    },
  },
},

(dummy question here)
Where should I put this snippet? I guess is not in serverless.yml given that is not in yml format.

[raffclar]

Workaround : you can disable the BlocPublicPolicy with the PublicAccessBlockConfiguration property of the S3 bucket CloudFormation structure. Use the extension property of your Lift construct :

extensions: {
  bucket: {
    Properties: {
      PublicAccessBlockConfiguration: {
        BlockPublicPolicy: false,
      },
    },
  },
},

(dummy question here) Where should I put this snippet? I guess is not in serverless.yml given that is not in yml format.

Like so:

constructs:
  landing:
    type: static-website
    path: public
    extensions:
      bucket:
        Properties:
          PublicAccessBlockConfiguration:
            BlockPublicPolicy: false

[InvisibleKind]

For me even the suggested snippet doesn't help. The basic static-website construct fails with a message:

Error:
CREATE_FAILED: buildpublicBucketHASH (AWS::S3::Bucket)
Resource handler returned message: "Access Denied (Service: S3, Status Code: 403, Request ID: -cut-, Extended Request ID: -cut-)" (RequestToken: -cut-, HandlerErrorCode: GeneralServiceException)

The serverless user is allowed to create S3 Buckets, of course. Moreover, if I change the static-website to single-page-app, no error appears and deploy works in a normal way.

[sean-ac]

The issue is here:

lift/src/constructs/aws/StaticWebsite.ts

Lines 67 to 77 in a91e293

	getBucketProps(): BucketProps {
	return {
	// Enable static website hosting
	websiteIndexDocument: "index.html",
	websiteErrorDocument: this.errorPath(),
	// public read access is required when enabling static website hosting
	publicReadAccess: true,
	// For a static website, the content is code that should be versioned elsewhere
	removalPolicy: RemovalPolicy.DESTROY,
	};
	}

This object needs to now return a BlockPublicAccess object, with every field set to false.

Docs: https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_s3.BlockPublicAccess.html

Example:

      blockPublicAccess: new BlockPublicAccess({
        blockPublicAcls: false,
        blockPublicPolicy: false,
        ignorePublicAcls: false,
        restrictPublicBuckets: false
      })

(You will need to import BlockPublicAccess from aws-cdk-lib/aws-s3)

I solved this by doing a local patch (via yarn patch serverless-lift), and modifying the .js files directly.

[kevincerro-dvrv]

I will try to fix this on a PR