github.com/khulnasoft-lab/defsec@v1.0.5-0.20230827010352-5e9f46893d95/rules/kubernetes/network/no_public_egress.go (about)

     1  package network
     2  
     3  import (
     4  	"github.com/khulnasoft-lab/defsec/internal/cidr"
     5  	"github.com/khulnasoft-lab/defsec/internal/rules"
     6  	"github.com/khulnasoft-lab/defsec/pkg/providers"
     7  	"github.com/khulnasoft-lab/defsec/pkg/scan"
     8  	"github.com/khulnasoft-lab/defsec/pkg/severity"
     9  	"github.com/khulnasoft-lab/defsec/pkg/state"
    10  )
    11  
    12  var CheckNoPublicEgress = rules.Register(
    13  	scan.Rule{
    14  		AVDID:       "AVD-KUBE-0002",
    15  		Provider:    providers.KubernetesProvider,
    16  		Service:     "network",
    17  		ShortCode:   "no-public-egress",
    18  		Summary:     "Public egress should not be allowed via network policies",
    19  		Impact:      "Exfiltration of data to the public internet",
    20  		Resolution:  "Remove public access except where explicitly required",
    21  		Explanation: `You should not expose infrastructure to the public internet except where explicitly required`,
    22  		Links:       []string{},
    23  		Terraform: &scan.EngineMetadata{
    24  			GoodExamples:        terraformNoPublicEgressGoodExamples,
    25  			BadExamples:         terraformNoPublicEgressBadExamples,
    26  			Links:               terraformNoPublicEgressLinks,
    27  			RemediationMarkdown: terraformNoPublicEgressRemediationMarkdown,
    28  		},
    29  		Severity: severity.High,
    30  	},
    31  	func(s *state.State) (results scan.Results) {
    32  		for _, policy := range s.Kubernetes.NetworkPolicies {
    33  			if policy.Metadata.IsUnmanaged() {
    34  				continue
    35  			}
    36  			for _, destination := range policy.Spec.Egress.DestinationCIDRs {
    37  				if cidr.IsPublic(destination.Value()) {
    38  					results.Add(
    39  						"Network policy allows egress to the public internet.",
    40  						destination,
    41  					)
    42  				} else {
    43  					results.AddPassed(destination)
    44  				}
    45  			}
    46  		}
    47  		return
    48  	},
    49  )