Allow user access to one directory in a S3 Bucket

Question

I searched through existing questions and couldnt find an answer.

I want to restrict access to one directory S3 bucket to some user. For example, I have the directory my-bucket/test/123. I put a few images to this directory. Other users should not have access to this directory. Then I created Bucket policy:

{
"Version": "2012-10-17",
"Statement": [
    {
        "Sid": "AddPerm",
        "Effect": "Allow",
        "Principal": {
            "AWS": "arn:aws:iam::123456789000:user/some-user"
        },
        "Action": "s3:*",
        "Resource": "arn:aws:s3:::my-bucket/test/123/*"
    }
]
}

But when I tried to open file in browser, I recieved "Access Denied" message.

I tried to use Deny effect and NotPrincipal . In this case, the files are available to other users. Please help!

Answer 1

You also need bucket listing permissions on the root prefix (folder) as described in this AWS doc Writing IAM Policies: Grant Access to User-Specific Folders in an Amazon S3 Bucket :

Although David should have access to only his home folder, he requires additional permissions so that he can navigate to his folder in the Amazon S3 console. David needs permission to list objects at the root level of the my-company bucket and in the home/ folder.