cdk-nag 0.0.5

Check CDK applications for best practices using a combination on available rule packs.

cdk-nag

Language	cdk-nag	monocdk-nag
Python
TypeScript

Check CDK applications for best practices using a combination of available rule packs. Inspired by cfn_nag

Available Packs

See RULES for more information on all the available packs.

1. AWS Solutions
2. NIST 800-53 (In Progress)

Usage

cdk

# Example automatically generated without compilation. See https://github.com/aws/jsii/issues/826
from aws_cdk.core import App, Aspects
from ...lib.cdk_test_stack import CdkTestStack
from cdk_nag import AwsSolutionsChecks

app = App()
CdkTestStack(app, "CdkNagDemo")
# Simple rule informational messages
Aspects.of(app).add(AwsSolutionsChecks())

monocdk

# Example automatically generated without compilation. See https://github.com/aws/jsii/issues/826
from monocdk import App, Aspects
from monocdk_nag import AwsSolutionsChecks
from ...lib.my_stack import MyStack

app = App()
CdkTestStack(app, "CdkNagDemo")
# Simple rule informational messages
Aspects.of(app).add(AwsSolutionsChecks())

Suppressing a Rule

Example 1) Default Construct

# Example automatically generated without compilation. See https://github.com/aws/jsii/issues/826
test = SecurityGroup(self, "test",
    vpc=Vpc(self, "vpc")
)
test.add_ingress_rule(Peer.any_ipv4(), Port.all_traffic())
test_cfn = test.node.default_child
test_cfn.add_metadata("cdk_nag",
    rules_to_suppress=[{"id": "AwsSolutions-EC23", "reason": "at least 10 characters"}
    ]
)

Example 2) Dependent Constructs

# Example automatically generated without compilation. See https://github.com/aws/jsii/issues/826
user = User(self, "rUser")
user.add_to_policy(
    PolicyStatement(
        actions=["s3:PutObject"],
        resources=[Bucket(self, "rBucket").arn_for_objects("*")]
    ))
cfn_user = user.node.children
for child in cfn_user:
    resource = child.node.default_child
    if resource != undefined && resource.cfn_resource_type == "AWS::IAM::Policy":
        resource.add_metadata("cdk_nag",
            rules_to_suppress=[{
                "id": "AwsSolutions-IAM5",
                "reason": "The user is allowed to put objects on all prefixes in the specified bucket."
            }
            ]
        )

Rules and Property Overrides

In some cases L2 Constructs do not have a native option to remediate an issue and must be fixed via Raw Overrides. Since raw overrides take place after template synthesis these fixes are not caught by the cdk_nag. In this case you should remediate the issue and suppress the issue like in the following example.

Example) Property Overrides

# Example automatically generated without compilation. See https://github.com/aws/jsii/issues/826
instance = Instance(stack, "rInstance",
    vpc=Vpc(stack, "rVpc"),
    instance_type=InstanceType(InstanceClass.T3),
    machine_image=MachineImage.latest_amazon_linux()
)
cfn_ins = instance.node.default_child
cfn_ins.add_property_override("DisableApiTermination", True)
cfn_ins.add_metadata("cdk_nag",
    rules_to_suppress=[{
        "id": "AwsSolutions-EC29",
        "reason": "Remediated through property override "
    }
    ]
)

Contributing

See CONTRIBUTING for more information.

License

This project is licensed under the Apache-2.0 License.