How to block public access to an S3 bucket from multiple AWS accounts 

To block public access to an S3 bucket from multiple AWS 
accounts, you can follow these steps:
Access Control Policies:
Ensure that there are no bucket policies or access control 
lists (ACLs) that grant public access.
Bucket Policy:
Attach a bucket policy that explicitly denies all public 
access. Here's an example policy:
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "PublicAccess",
"Effect": "Deny",
"Principal": "*",
"Action": "s3:GetObject",
"Resource": "arn:aws:s3:::YOUR_BUCKET_NAME/*"
}
]
}
Cross-Account Access:
Ensure that there are no cross-account access policies that 
allow access from other AWS accounts.

Block Public Access Settings:
In the S3 bucket settings, go to the "Permissions" tab and 
scroll down to the "Block public access" section. Enable all 
four settings:

Block all public access
Block public access to buckets and objects granted through new 
access control lists (ACLs)
Block public access to buckets and objects granted through any 
access control lists (ACLs)
Block public access to buckets and objects granted through new 
public bucket or access point policies

Access Logging (Optional):
Enable access logging for your S3 bucket. This can help you 
track who accesses your bucket.

Regular Auditing:
Regularly review your bucket policies and permissions to ensure 
they remain secure. Remember to test thoroughly after making 
these changes to ensure that your S3 bucket is no longer 
publicly accessible. Keep in mind that denying all public 
access may affect legitimate use cases, so be sure to adjust 
your policies accordingly.
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3 thoughts on “How to block public access to an S3 bucket from multiple AWS accounts”

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