How can I set a policy for an s3 bucket that allows authenticated users to list the bucket or get any file from the bucket

Question

I have set a permission on the bucket that allows \"Authenticated Users\" to list, upload, and delete from a bucket I created. This seems to allow me to upload file

Answer 1

Just to compliment @c4urself answer. the answer help solve my issue as well, but there is some indication from AWS documentation, which you can add more than one resource, just use [] to make them a list. http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/vpc-endpoints.html#vpc-endpoints-s3-bucket-policies

{
  "Statement": [
    {
      "Sid": "Access-to-specific-bucket-only",
      "Principal": "*",
      "Action": [
        "s3:ListBucket",
        "s3:GetObject",
        "s3:PutObject"
      ],
      "Effect": "Allow",
      "Resource": ["arn:aws:s3:::my_secure_bucket",
                   "arn:aws:s3:::my_secure_bucket/*"]
    }
  ]
}

Answer 2

s3:GetObject applies to the objects in the bucket so the Resource is correct: "Resource": "arn:aws:s3:::my-bucket/*".

s3:ListBucket applies to the Bucket itself and so the Resource should be "Resource": "arn:aws:s3:::my-bucket"

your resulting policy should resemble:

{
  "Id": "Policy-some-number",
  "Statement": [
    {
      "Sid": "Stmt-some-number",
      "Action": [
        "s3:GetObject"
      ],
      "Effect": "Allow",
      "Resource": "arn:aws:s3:::my-bucket/*",
      "Principal": {
        "AWS": [
          "*"
        ]
      }
    },
    {
      "Sid": "Stmt-some-other-number",
      "Action": [
        "s3:ListBucket"
      ],
      "Effect": "Allow",
      "Resource": "arn:aws:s3:::my-bucket",
      "Principal": {
        "AWS": [
          "*"
        ]
      }
    }
  ]
}

Answer 3

Update Bucket policy as below

{
"Version": "2012-10-17",
"Id": "Policy1546023103427",
"Statement": [
    {
        "Sid": "Stmt1546023101836",
        "Effect": "Allow",
        "Principal": "*",
        "Action": [
            "s3:ListBucket",
            "s3:GetObject"
        ],
        "Resource": [
            "arn:aws:s3:::usagereports-atul",
            "arn:aws:s3:::usagereports-atul/*"
        ]
    }
]

}