How to whitelist the known IP's on S3 bucket policy so that only whitelisted IPs can download the Object

Question

How to whitelist the known IP's on S3 bucket policy so that only whitelisted IPs can only download the Object.Rest of users must get access denied.

Am using this policy,am still whitelisted users are getting 403 error while trying to access the object URL stored in S3.Please assist here,

Here is policy which am using,{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "Statement1",
            "Effect": "Allow",
            "Principal": "*",
            "Action": "s3:GetObject",
            "Resource": "arn:aws:s3:::toch-poc-2/*",
            "Condition": {
                "IpAddress": {
                    "aws:SourceIp": [
                        "3.6.255.121",
                        "43.204.223.244",
                        "34.126.80.246",
                        "34.142.191.139",
                        "34.143.188.86",
                        "49.249.215.66",
                        "15.207.175.132"
                    ]
                }
            }
        }
    ]
}

Answer

Is all block public access turned off?  
If this is not all turned off, access will fail even if allowed by the bucket policy.  
https://docs.aws.amazon.com/AmazonS3/latest/userguide/access-control-block-public-access.html

The IP address should be changed to something like "34.126.80.246/32".

Answer

Thanks this policy worked,but only challenge here which we are facing is with this IP   "3.6.255.121/32",
I even tried changing the subnet to 8 and 16.It did not work.

Any recommendations would be helpful

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "Statement1",
            "Effect": "Allow",
            "Principal": "*",
            "Action": "s3:GetObject",
            "Resource": "arn:aws:s3:::toch-poc-2/*",
            "Condition": {
                "IpAddress": {
                    "aws:SourceIp": [
                        "3.6.255.121/32",
                        "43.204.223.244/32",
                        "34.126.80.246/32",
                        "34.142.191.139/32",
                        "34.143.188.86/32",
                        "49.249.215.66/32",
                        "15.207.175.132/32",
                        "10.190.3.0/24"
                    ]
                }
            }
        }
    ]
}

Answer

Yes.Am using the same policy as shared.
Have enabled the ACL has well
And Ticket the Public access box in the ACL with read and read option enabled.
But still facing the same issue

Answer

Your Bucket policy is wrong. You do **NOT** need to turn OFF block public access. Because the policy contains A set of Classless Inter-Domain Routings (CIDRs) aws:SourceIp

BLOCK PUBLIC isnt applicable because the Policy isnt classed as public because its locked down to sourceIP

Your also have to be aware of KMS. If your using AWS SSE its ok, if your objects are encrypted with KMS you will have to allow access to the KMS Key also.

```
{
	"Version": "2012-10-17",
	"Statement": [
		{
			"Sid": "Statement1",
			"Effect": "Allow",
			"Principal": "*",
			"Action": "s3:GetObject",
			"Resource": arn:aws:s3:::toch-poc-2/*",
			"Condition": {
				"IpAddress": {
					"aws:SourceIp": [
						"3.6.255.121/32",
						"43.204.223.244/32",
						"34.126.80.246/32",
						"34.142.191.139/32",
						"34.143.188.86/32",
						"49.249.215.66/32",
						"15.207.175.132/32"
					]
				}
			}
		}
	]
}
```

Answer

Hi, did you allow S3 Public Access on the bucket ? If not, you will have to because it will block access and result in http 403 before your bucket policy is even used.

See https://docs.aws.amazon.com/AmazonS3/latest/userguide/access-control-block-public-access.html

How to whitelist the known IP's on S3 bucket policy so that only whitelisted IPs can download the Object

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