S3 bucket policy example for cross-account access

bucket_policy.json

{
    "Version": "2008-10-17",
    "Id": "CrossAccountAccessExample",
    "Statement": [
        {
            "Effect": "Allow",
            "Principal": {
                "AWS": "arn:aws:iam::123456789123:user/admin"
            },
            "Action": [
                "s3:GetBucketLocation",
                "s3:ListBucket"
            ],
            "Resource": "arn:aws:s3:::my-bucket"
        },
        {
            "Effect": "Allow",
            "Principal": {
                "AWS": "arn:aws:iam::123456789123:user/myuser"
            },
            "Action": [
                "s3:GetObject",
                "s3:PutObject",
                "s3:PutObjectAcl"
            ],
            "Resource": "arn:aws:s3:::my-bucket/*"
        }
    ]
}