AWS CloudFormation Stack Termination Protection

Description

Protects a CloudFormation stack from accidentally being deleted. If you attempt to delete a stack with termination protection enabled, the deletion fails and the stack, including its status, will remain unchanged.

Query · python

def policy(resource):
    # On nested stacks, this can only be set on the root stack
    if resource["RootId"] is not None:
        return True

    return resource["EnableTerminationProtection"] is True

Analyst notes

This setting can only be enabled on stack creation. To add it to an existing stack, it must be re-created with the --enable-termination-protection flag.

Raw source AWS CloudFormation Stack Termination Protection · Panther Python
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Published by panther-labs/panther-analysis ↗, licensed under Apache 2.0 ↗. Reproduced here unmodified. 
AnalysisType: policy
Filename: aws_cloudformation_termination_protection.py
PolicyID: "AWS.CloudFormation.Stack.TerminationProtection"
DisplayName: "AWS CloudFormation Stack Termination Protection"
Enabled: true
ResourceTypes:
  - AWS.CloudFormation.Stack
Reports:
  MITRE ATT&CK:
    - TA0040:T1496
Tags:
  - AWS
  - Operations
  - Panther
  - Impact:Resource Hijacking
Severity: Info
Description: >
  Protects a CloudFormation stack from accidentally being deleted. If you attempt to delete a stack
  with termination protection enabled, the deletion fails and the stack, including its status,
  will remain unchanged.
Runbook: |
  This setting can only be enabled on stack creation. To add it to an existing stack, it must
  be re-created with the --enable-termination-protection flag.
Reference: https://amzn.to/2HAdfny
Tests:
  - Name: Termination Protection Enabled
    ExpectedResult: true
    Resource:
      {
        "AccountId": "123456789012",
        "Region": "us-west-2",
        "ARN": "arn:aws:cloudformation:us-west-2:123456789012:stack/iam-roles/11",
        "ID": "arn:aws:cloudformation:us-west-2:123456789012:stack/iam-roles/11",
        "Name": "iam-roles",
        "Tags": {},
        "ResourceID": "arn:aws:cloudformation:us-west-2:123456789012:stack/iam-roles/11",
        "ResourceType": "AWS.CloudFormation.Stack",
        "TimeCreated": "2019-01-01T00:00:00Z",
        "Capabilities": ["CAPABILITY_NAMED_IAM"],
        "ChangeSetId": null,
        "DeletionTime": null,
        "Description": "IAM Admin role",
        "DisableRollback": false,
        "DriftInformation":
          {
            "LastCheckTimestamp": "2019-01-01T00:00:00Z",
            "StackDriftStatus": "DRIFTED",
          },
        "EnableTerminationProtection": true,
        "LastUpdatedTime": "2019-01-01T00:00:00Z",
        "NotificationARNs": [],
        "Outputs": null,
        "Parameters":
          [
            {
              "ParameterKey": "MaxSessionDurationSec",
              "ParameterValue": "28800",
              "ResolvedValue": null,
              "UsePreviousValue": null,
            },
            {
              "ParameterKey": "Prefix",
              "ParameterValue": "Dev",
              "ResolvedValue": null,
              "UsePreviousValue": null,
            },
          ],
        "ParentId": null,
        "RoleARN": "arn:aws:iam::123456789012:role/CFNServiceRole",
        "RollbackConfiguration":
          { "MonitoringTimeInMinutes": null, "RollbackTriggers": [] },
        "RootId": null,
        "StackId": "arn:aws:cloudformation:us-west-2:123456789012:stack/iam-roles/11",
        "StackStatus": "UPDATE_COMPLETE",
        "StackStatusReason": null,
        "TimeoutInMinutes": null,
        "Drifts": [],
      }
  - Name: Termination Protection Not Specified
    ExpectedResult: false
    Resource:
      {
        "AccountId": "123456789012",
        "Region": "us-west-2",
        "ARN": "arn:aws:cloudformation:us-west-2:123456789012:stack/iam-roles/11",
        "ID": "arn:aws:cloudformation:us-west-2:123456789012:stack/iam-roles/11",
        "Name": "iam-roles",
        "Tags": {},
        "ResourceID": "arn:aws:cloudformation:us-west-2:123456789012:stack/iam-roles/11",
        "ResourceType": "AWS.CloudFormation.Stack",
        "TimeCreated": "2019-01-01T00:00:00Z",
        "Capabilities": ["CAPABILITY_NAMED_IAM"],
        "ChangeSetId": null,
        "DeletionTime": null,
        "Description": "IAM Admin role",
        "DisableRollback": false,
        "DriftInformation":
          {
            "LastCheckTimestamp": "2019-01-01T00:00:00Z",
            "StackDriftStatus": "DRIFTED",
          },
        "EnableTerminationProtection": null,
        "LastUpdatedTime": "2019-01-01T00:00:00Z",
        "NotificationARNs": [],
        "Outputs": null,
        "Parameters":
          [
            {
              "ParameterKey": "MaxSessionDurationSec",
              "ParameterValue": "28800",
              "ResolvedValue": null,
              "UsePreviousValue": null,
            },
            {
              "ParameterKey": "Prefix",
              "ParameterValue": "Dev",
              "ResolvedValue": null,
              "UsePreviousValue": null,
            },
          ],
        "ParentId": null,
        "RoleARN": null,
        "RollbackConfiguration":
          { "MonitoringTimeInMinutes": null, "RollbackTriggers": [] },
        "RootId": null,
        "StackId": "arn:aws:cloudformation:us-west-2:123456789012:stack/iam-roles/11",
        "StackStatus": "UPDATE_COMPLETE",
        "StackStatusReason": null,
        "TimeoutInMinutes": null,
        "Drifts": [],
      }
  - Name: Termination Protection Not Specified On Nested Stack
    ExpectedResult: true
    Resource:
      {
        "AccountId": "123456789012",
        "Region": "us-west-2",
        "ARN": "arn:aws:cloudformation:us-west-2:123456789012:stack/iam-roles/11",
        "ID": "arn:aws:cloudformation:us-west-2:123456789012:stack/iam-roles/11",
        "Name": "iam-roles",
        "Tags": {},
        "ResourceID": "arn:aws:cloudformation:us-west-2:123456789012:stack/iam-roles/11",
        "ResourceType": "AWS.CloudFormation.Stack",
        "TimeCreated": "2019-01-01T00:00:00Z",
        "Capabilities": ["CAPABILITY_NAMED_IAM"],
        "ChangeSetId": null,
        "DeletionTime": null,
        "Description": "IAM Admin role",
        "DisableRollback": false,
        "DriftInformation":
          {
            "LastCheckTimestamp": "2019-01-01T00:00:00Z",
            "StackDriftStatus": "DRIFTED",
          },
        "EnableTerminationProtection": null,
        "LastUpdatedTime": "2019-01-01T00:00:00Z",
        "NotificationARNs": [],
        "Outputs": null,
        "Parameters":
          [
            {
              "ParameterKey": "MaxSessionDurationSec",
              "ParameterValue": "28800",
              "ResolvedValue": null,
              "UsePreviousValue": null,
            },
            {
              "ParameterKey": "Prefix",
              "ParameterValue": "Dev",
              "ResolvedValue": null,
              "UsePreviousValue": null,
            },
          ],
        "ParentId": "arn:aws:cloudformation:us-west-2:123456789012:stack/iam-roles/12",
        "RoleARN": null,
        "RollbackConfiguration":
          { "MonitoringTimeInMinutes": null, "RollbackTriggers": [] },
        "RootId": "arn:aws:cloudformation:us-west-2:123456789012:stack/iam-roles/12",
        "StackId": "arn:aws:cloudformation:us-west-2:123456789012:stack/iam-roles/11",
        "StackStatus": "UPDATE_COMPLETE",
        "StackStatusReason": null,
        "TimeoutInMinutes": null,
        "Drifts": [],
      }


# ------ paired body: aws_cloudformation_termination_protection.py ------

def policy(resource):
    # On nested stacks, this can only be set on the root stack
    if resource["RootId"] is not None:
        return True

    return resource["EnableTerminationProtection"] is True

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