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Standard S3 Policy

Here’s a standard S3 policy to grant an IAM user access to a bucket within an AWS account. User is allowed to add, update, and delete objects. These 3 actions s3:ListAllMyBuckets, s3:GetBucketLocation, and s3:ListBucket are the additional permissions required to access the console. Also, the s3:PutObjectAcl and the s3:GetObjectAcl actions are required to be able to copy, cut, and paste objects within the console. 

{
   "Version":"2012-10-17",
   "Statement":[
      {
         "Effect":"Allow",
         "Action":[
            "s3:ListAllMyBuckets"
         ],
         "Resource":"arn:aws:s3:::*"
      },
      {
         "Effect":"Allow",
         "Action":[
            "s3:ListBucket",
            "s3:GetBucketLocation"
         ],
         "Resource":"arn:aws:s3:::examplebucket"
      },
      {
         "Effect":"Allow",
         "Action":[
            "s3:PutObject",
            "s3:PutObjectAcl",
            "s3:GetObject",
            "s3:GetObjectAcl",
            "s3:DeleteObject"
         ],
         "Resource":"arn:aws:s3:::examplebucket/*"
      }
   ]
}

AWS RDS Backup Permission

Here’s the IAM policy to allow RDS Backup or create a snapshot on AWS.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "VisualEditor0",
            "Effect": "Allow",
            "Action": [
                "rds:RestoreDBClusterFromSnapshot",
		"rds:DescribeDBSnapshots",
		"rds:CopyDBSnapshot",
		"rds:CopyDBClusterSnapshot",
		"rds:DeleteDBSnapshot",
		"rds:DeleteDBClusterSnapshot",
		"rds:CreateDBSnapshot",
		"rds:RestoreDBInstanceFromDBSnapshot",
		"rds:CreateDBInstance",
		"rds:DescribeDBClusterSnapshots",
		"rds:DescribeDBInstances",
		"rds:DescribeDBClusters",
		"rds:DeleteDBInstance",
		"rds:CreateDBClusterSnapshot",
		"rds:ModifyDBSnapshotAttribute",
		"rds:ModifyDBClusterSnapshotAttribute",
		"rds:ListTagsForResource",
		"rds:DeleteDBCluster",
		"ec2:DescribeSecurityGroups",
		"ec2:DescribeRegions",
		"ec2:DescribeAvailabilityZones",
		"ec2:DescribeVpcs",
		"ec2:DescribeAccountAttributes",
		"ec2:DescribeSubnets",
		"iam:GetUser",
		"iam:GetAccountAuthorizationDetails",
		"kms:ReEncrypt*",
		"kms:GenerateDataKey*",
		"kms:CreateGrant",
		"kms:DescribeKey*",
		"kms:ListKeys",
		"kms:ListAliases",
		"kms:Encrypt",
		"kms:Decrypt",
		"kms:GenerateDataKeyWithoutPlaintext",
		"kms:ListKeys",
		"kms:ListAliases",
		"kms:ListResourceTags"
            ],
            "Resource": "*"
        }
    ]
}

AWS S3 Replication Policy

Here’s the policy for S3 replication between regions.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": [
                "s3:Get*",
                "s3:ListBucket"
            ],
            "Effect": "Allow",
            "Resource": [
                "arn:aws:s3:::source-bucket-name",
                "arn:aws:s3:::source-bucket-name/*"
            ]
        },
        {
            "Action": [
                "s3:ReplicateObject",
                "s3:ReplicateDelete",
                "s3:ReplicateTags",
                "s3:GetObjectVersionTagging"
            ],
            "Effect": "Allow",
            "Resource": "arn:aws:s3:::destination-bucket-name/*"
        }
    ]
}

AWS ECR PushPull Policy

Amazon Elastic Container Registry (ECR) is a fully-managed Docker container registry that makes it easy for developers to store, manage, and deploy Docker container images.

Here’s the AWS IAM policy to push and pull images from Docker within ECR.

{
  "Version": "2008-10-17",
  "Statement": [
    {
      "Sid": "AllowPushPull",
      "Effect": "Allow",
      "Resource": [
            "arn:aws:iam::*:role/your-custom-role"
      ],
      "Action": [
        "ecr:GetDownloadUrlForLayer",
        "ecr:BatchGetImage",
        "ecr:BatchCheckLayerAvailability",
        "ecr:PutImage",
        "ecr:InitiateLayerUpload",
        "ecr:UploadLayerPart",
        "ecr:CompleteLayerUpload"
      ]
    }
  ]
}

GCP Add IAM Role to Service Account

Here’s how to add an IAM role to a GCP Service Account.

gcloud projects add-iam-policy-binding your-project-id \
--member serviceAccount:service-account-name@your-project-id.iam.gserviceaccount.com \
--role roles/storage.objectAdmin