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create-kms-policy-for-rds.md

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Create an IAM Policy to manage KMS resources

In this tutorial we will create an IAM policy an attach this to the created rds-group-access as described in Create a new IAM User. This will enable an IAM user that has permissions to manage RDS resources also be able to use KMS and CMK keys.

This example assumes you have created an Administrator IAM user or similar user with IAM create privilege capability for your AWS Account.

Select AWS user with IAM create privileges

export AWS_PROFILE=administrator
aws sts get-caller-identity

New IAM Policy JSON data

wget https://gist.githubusercontent.com/ronaldbradford/72a56e24571079cbd0255fe34c0c29e8/raw/167d4b767e77ffb0c5ee561aff0ce74d886efcd3/rds-kms-policy.json
jq . rds-kms-policy.json

rds-kms-policy.json

{
  "Version": "2012-10-17",
  "Statement": {
    "Effect": "Allow",
    "Action": [
      "kms:CreateKey",
      "kms:TagResource",
      "kms:CreateAlias"
      ],
    "Resource": "*"
  }
}

Create and attach the Policy

IAM_GROUP="rds-group-access"
IAM_KMS_POLICY="rds-kms-policy"

aws iam create-policy --policy-name ${IAM_KMS_POLICY} --policy-document file://${IAM_KMS_POLICY}.json
ACCOUNT=$(aws sts get-caller-identity | jq -r .Account)

#This command produces no output
aws iam attach-group-policy --group-name ${IAM_GROUP} --policy-arn arn:aws:iam::${ACCOUNT}:policy/${IAM_KMS_POLICY}
aws iam list-attached-group-policies --group-name ${IAM_GROUP}

Example Output

iam create-policy

{
    "Policy": {
        "PolicyName": "rds-kms-policy",
        "PolicyId": "ANPAWA6FBRN62RCNN6SNK",
        "Arn": "arn:aws:iam::999999999999:policy/rds-kms-policy",
        "Path": "/",
        "DefaultVersionId": "v1",
        "AttachmentCount": 0,
        "PermissionsBoundaryUsageCount": 0,
        "IsAttachable": true,
        "CreateDate": "2021-12-13T00:59:36+00:00",
        "UpdateDate": "2021-12-13T00:59:36+00:00"
    }
}

iam list-attached-Policies

{
  "AttachedPolicies": [
      {
          "PolicyName": "AmazonRDSFullAccess",
          "PolicyArn": "arn:aws:iam::aws:policy/AmazonRDSFullAccess"
      },
      {
          "PolicyName": "rds-kms-policy",
          "PolicyArn": "arn:aws:iam::999999999999:policy/rds-kms-policy"
      }
  ]
}

References