AWS CDK configuration scanning
Checkov supports the evaluation of policies on your CDK files by synthesizing a Cloudformation template out of the CDK code.
Full list of Cloudformation policies the checks can be found here.
Example misconfigured AWS CDK code
python CDK exmple
from aws_cdk import (
aws_s3,
Stack,
)
from constructs import Construct
# End generated code block.
class BucketApp(Stack):
def __init__(self, scope: Construct, id: str, **kwargs) -> None:
super().__init__(scope, id, **kwargs)
#
# RESOURCES
#
pipeline_artifact_bucket = aws_s3.CfnBucket(
self,
"PipelineArtifactBucket",
access_control="Private",
bucket_encryption=aws_s3.CfnBucket.BucketEncryptionProperty(
server_side_encryption_configuration=[
aws_s3.CfnBucket.ServerSideEncryptionRuleProperty(
server_side_encryption_by_default=aws_s3.CfnBucket.ServerSideEncryptionByDefaultProperty(
sse_algorithm="AES256"
)
)
]
),
public_access_block_configuration=aws_s3.BlockPublicAccess.BLOCK_ALL
)
pipeline_artifact_bucket.cfn_options.metadata = {
'checkov': {
'skip': [
{
'id': 'CKV_AWS_18',
'comment': 'No need to ensure the S3 bucket has access logging enabled'
}
]
}
}
typescript CDK exmple
const bucket = new aws_s3.Bucket(this, 'MyBucket', {
versioned: true
});
const cfnBucket = bucket.node.defaultChild as aws_s3.CfnBucket;
cfnBucket.cfnOptions.metadata = {
'checkov': {
'skip': [
{
'id': 'CKV_AWS_18',
'comment': 'No need to ensure the S3 bucket has access logging enabled'
}
]
}
}
The metadata secution contain 1 skip for CKV_AWS_18
Run the cdk synth command to generate a CloudFormation template and scan it
{
"Resources": {
"MyBucketF68F3FF0": {
"Type": "AWS::S3::Bucket",
"Properties": {
"VersioningConfiguration": {
"Status": "Enabled"
}
},
"UpdateReplacePolicy": "Retain",
"DeletionPolicy": "Retain",
"Metadata": {
"checkov": {
"skip": [
{
"id": "CKV_AWS_18",
"comment": "No need to ensure the S3 bucket has access logging enabled"
}
]
}
}
},
"CDKMetadata": {
"Type": "AWS::CDK::Metadata",
"Properties": {
"Analytics": "v2:deflate64:f"
},
"Metadata": {
"aws:cdk:path": "AppStack/CDKMetadata/Default"
},
"Condition": "CDKMetadataAvailable"
}
},
"Conditions": {
"CDKMetadataAvailable": {
"Fn::Or": [
{
"Fn::Or": [
{
"Fn::Equals": [
{
"Ref": "AWS::Region"
},
"af-south-1"
]
},
{
"Fn::Equals": [
{
"Ref": "AWS::Region"
},
"ap-east-1"
]
},
{
"Fn::Equals": [
{
"Ref": "AWS::Region"
},
"ap-northeast-1"
]
},
{
"Fn::Equals": [
{
"Ref": "AWS::Region"
},
"ap-northeast-2"
]
},
{
"Fn::Equals": [
{
"Ref": "AWS::Region"
},
"ap-south-1"
]
},
{
"Fn::Equals": [
{
"Ref": "AWS::Region"
},
"ap-southeast-1"
]
},
{
"Fn::Equals": [
{
"Ref": "AWS::Region"
},
"ap-southeast-2"
]
},
{
"Fn::Equals": [
{
"Ref": "AWS::Region"
},
"ca-central-1"
]
},
{
"Fn::Equals": [
{
"Ref": "AWS::Region"
},
"cn-north-1"
]
},
{
"Fn::Equals": [
{
"Ref": "AWS::Region"
},
"cn-northwest-1"
]
}
]
},
{
"Fn::Or": [
{
"Fn::Equals": [
{
"Ref": "AWS::Region"
},
"eu-central-1"
]
},
{
"Fn::Equals": [
{
"Ref": "AWS::Region"
},
"eu-north-1"
]
},
{
"Fn::Equals": [
{
"Ref": "AWS::Region"
},
"eu-south-1"
]
},
{
"Fn::Equals": [
{
"Ref": "AWS::Region"
},
"eu-west-1"
]
},
{
"Fn::Equals": [
{
"Ref": "AWS::Region"
},
"eu-west-2"
]
},
{
"Fn::Equals": [
{
"Ref": "AWS::Region"
},
"eu-west-3"
]
},
{
"Fn::Equals": [
{
"Ref": "AWS::Region"
},
"me-south-1"
]
},
{
"Fn::Equals": [
{
"Ref": "AWS::Region"
},
"sa-east-1"
]
},
{
"Fn::Equals": [
{
"Ref": "AWS::Region"
},
"us-east-1"
]
},
{
"Fn::Equals": [
{
"Ref": "AWS::Region"
},
"us-east-2"
]
}
]
},
{
"Fn::Or": [
{
"Fn::Equals": [
{
"Ref": "AWS::Region"
},
"us-west-1"
]
},
{
"Fn::Equals": [
{
"Ref": "AWS::Region"
},
"us-west-2"
]
}
]
}
]
}
},
"Parameters": {
"BootstrapVersion": {
"Type": "AWS::SSM::Parameter::Value<String>",
"Default": "/cdk-bootstrap/hnb659fds/version",
"Description": "Version of the CDK Bootstrap resources in this environment, automatically retrieved from SSM Parameter Store. [cdk:skip]"
}
},
"Rules": {
"CheckBootstrapVersion": {
"Assertions": [
{
"Assert": {
"Fn::Not": [
{
"Fn::Contains": [
[
"1",
"2",
"3",
"4",
"5"
],
{
"Ref": "BootstrapVersion"
}
]
}
]
},
"AssertDescription": "CDK bootstrap stack version 6 required. Please run 'cdk bootstrap' with a recent version of the CDK CLI."
}
]
}
}
}
...
Example output
$ checkov -f cdk.out/AppStack.template.json
_ _
___| |__ ___ ___| | _______ __
/ __| '_ \ / _ \/ __| |/ / _ \ \ / /
| (__| | | | __/ (__| < (_) \ V /
\___|_| |_|\___|\___|_|\_\___/ \_/
By bridgecrew.io | version: 2.0.727
cloudformation scan results:
Passed checks: 3, Failed checks: 5, Skipped checks: 1
...
Check: CKV_AWS_18: "Ensure the S3 bucket has access logging enabled"
SKIPPED for resource: AWS::S3::Bucket.MyBucketF68F3FF0
Suppress comment: Ensure the S3 bucket has access logging enabled
File: /cfn.json:3-22
Guide: https://docs.bridgecrew.io/docs/s3_13-enable-logging