ec2-efs.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "1",
            "Effect": "Allow",
            "Principal": {
                "AWS": "*"
            },
            "Action": [
                "elasticfilesystem:ClientRootAccess",
                "elasticfilesystem:ClientMount",
                "elasticfilesystem:ClientWrite"
            ],
            "Resource": "EFSのARN",
            "Condition": {
                "IpAddress": {
                    "aws:SourceIp": "許可したいEC2のIP"
                }
            }
        },
        {
            "Sid": "2",
            "Effect": "Allow",
            "Principal": {
                "AWS": "*"
            },
            "Action": [
                "elasticfilesystem:ClientRootAccess",
                "elasticfilesystem:ClientMount"
            ],
            "Resource": "EFSのARN",
            "Condition": {
                "NotIpAddress": {
                    "aws:SourceIp": "許可したいEC2のIP"
                }
            }
        }
    ]
}