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CloudWatch log groups should be encrypted using CMK

AWS-0017
Service: cloudwatchSeverity: low
OfficialBuilt-inVerified

CloudWatch log groups are encrypted by default, however, to get the full benefit of controlling key rotation and other KMS aspects a KMS CMK should be used.

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Recommendation

Enable CMK encryption of CloudWatch Log Groups

Check Code

# METADATA
# title: CloudWatch log groups should be encrypted using CMK
# description: |
#   CloudWatch log groups are encrypted by default, however, to get the full benefit of controlling key rotation and other KMS aspects a KMS CMK should be used.
# scope: package
# schemas:
#   - input: schema["cloud"]
# related_resources:
#   - https://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/encrypt-log-data-kms.html
# custom:
#   id: AWS-0017
#   long_id: aws-cloudwatch-log-group-customer-key
#   aliases:
#     - AVD-AWS-0017
#     - log-group-customer-key
#     - aws-cloudwatch-log-group-customer-key
#   provider: aws
#   service: cloudwatch
#   severity: LOW
#   recommended_action: Enable CMK encryption of CloudWatch Log Groups
#   input:
#     selector:
#       - type: cloud
#         subtypes:
#           - service: cloudwatch
#             provider: aws
#   examples: checks/cloud/aws/cloudwatch/log_group_customer_key.yaml
package builtin.aws.cloudwatch.aws0017

import rego.v1

import data.lib.cloud.metadata
import data.lib.cloud.value

deny contains res if {
	some group in input.aws.cloudwatch.loggroups
	without_cmk(group)
	res := result.new(
		"Log group is not encrypted.",
		metadata.obj_by_path(group, ["kmskeyid"]),
	)
}

without_cmk(group) if value.is_empty(group.kmskeyid)

without_cmk(group) if not group.kmskeyid

References