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CloudFormation guard rules template for Amazon EKS resources
The following rules are included:
let eks_clusters = Resources.*[
Type == "AWS::EKS::Cluster"
]
rule eks_private_only when %eks_clusters !empty {
%eks_clusters {
Properties {
ResourcesVpcConfig exists <<ResourcesVpcConfig is not configured. (Public access is enabled by default.)>>
when ResourcesVpcConfig exists {
ResourcesVpcConfig {
EndpointPublicAccess exists <<EndpointPublicAccess is not configured. (enabled by default.)>>
when EndpointPublicAccess exists {
EndpointPublicAccess == false <<Public access is enabled.>>
}
}
}
}
}
}
rule eks_control_plane_public_access_restricted when %eks_clusters !empty {
%eks_clusters {
Properties {
ResourcesVpcConfig exists <<ResourcesVpcConfig is not configured. (Public access is enabled by default.)>>
when ResourcesVpcConfig exists {
ResourcesVpcConfig {
EndpointPublicAccess exists <<EndpointPublicAccess is not configured. (enabled by default.)>>
when EndpointPublicAccess exists {
EndpointPublicAccess == false <<Public access is enabled.>> OR
EndpointPublicAccess == true
when EndpointPublicAccess == true {
PublicAccessCidrs.* {
this != "0.0.0.0/0" <<Unrestricted public access is enabled.>>
}
}
}
}
}
}
}
}
rule eks_secrets_encrypted when %eks_clusters !empty {
%eks_clusters {
Properties {
EncryptionConfig exists <<EncryptionConfig is not configured.(Secrets encryption is disabled.)>>
}
}
}
rule eks_control_plane_logging when %eks_clusters !empty {
%eks_clusters {
Properties {
Logging exists <<Logging is not configured.>>
when Logging exists {
Logging {
ClusterLogging {
some EnabledTypes[*].Type == "api" <<Logging is not configured for the API server.>>
some EnabledTypes[*].Type == "audit" <<Audit logging is not enabled.>>
some EnabledTypes[*].Type == "authenticator" <<Authenticator logging is not enabled.>>
some EnabledTypes[*].Type == "controllerManager" <<Controller Manager logging is not enabled.>>
some EnabledTypes[*].Type == "scheduler" <<Scheduler logging is not enabled.>>
}
}
}
}
}
}