added policy to check encryption for cloudtrail

avd_docs/aws/cloudtrail/AVD-AWS-0187/docs.md

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+
+Ensures CloudTrail encryption at rest is enabled for logs
+
+### Impact
+<!-- Add Impact here -->
+
+<!-- DO NOT CHANGE -->
+{{ remediationActions }}
+
+### Links
+- https://docs.aws.amazon.com/awscloudtrail/latest/userguide/encrypting-cloudtrail-log-files-with-aws-kms.html
+
+

internal/rules/policies/cloud/policies/aws/cloudtrail/enable_at_rest_encryption.rego

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+# METADATA
+# title: "CloudTrail Encryption"
+# description: "Ensures CloudTrail encryption at rest is enabled for logs"
+# scope: package
+# schemas:
+# - input: schema.input
+# related_resources:
+# - https://docs.aws.amazon.com/awscloudtrail/latest/userguide/encrypting-cloudtrail-log-files-with-aws-kms.html
+# custom:
+#   avd_id: AVD-AWS-0187
+#   provider: aws
+#   service: cloudtrail
+#   severity: HIGH
+#   short_code: enable-at-rest-encryption
+#   recommended_action: "Enable CloudTrail log encryption through the CloudTrail console or API"
+#   input:
+#     selector:
+#     - type: cloud
+package builtin.aws.cloudtrail.aws0187
+
+deny[res] {
+	trail := input.aws.cloudtrail.trails[_]
+	trail.kmskeyid.value == ""
+	res := result.new("Trail is not encrypted.",trail.kmskeyid)
+}

internal/rules/policies/cloud/policies/aws/cloudtrail/enable_at_rest_encryption_test.rego

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+package builtin.aws.cloudtrail.aws0187
+
+test_detects_when_decrypted {
+	r := deny with input as {"aws": {"cloudtrail": {"trails": [{"kmskeyid": {"value": ""}}]}}}
+	count(r) == 1
+}
+
+test_when_encrypted {
+	r := deny with input as {"aws": {"cloudtrail": {"trails": [{"kmskeyid": {"value": "key12"}}]}}}
+	count(r) == 0
+}