github.com/khulnasoft-lab/defsec@v1.0.5-0.20230827010352-5e9f46893d95/rules/cloud/policies/digitalocean/compute/no_public_egress.go (about)

     1  package compute
     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-DIG-0003",
    15  		Provider:    providers.DigitalOceanProvider,
    16  		Service:     "compute",
    17  		ShortCode:   "no-public-egress",
    18  		Summary:     "The firewall has an outbound rule with open access",
    19  		Impact:      "The port is exposed for ingress from the internet",
    20  		Resolution:  "Set a more restrictive cidr range",
    21  		Explanation: `Opening up ports to the public internet is generally to be avoided. You should restrict access to IP addresses or ranges that explicitly require it where possible.`,
    22  		Links: []string{
    23  			"https://docs.digitalocean.com/products/networking/firewalls/how-to/configure-rules/",
    24  		},
    25  		Terraform: &scan.EngineMetadata{
    26  			GoodExamples:        terraformNoPublicEgressGoodExamples,
    27  			BadExamples:         terraformNoPublicEgressBadExamples,
    28  			Links:               terraformNoPublicEgressLinks,
    29  			RemediationMarkdown: terraformNoPublicEgressRemediationMarkdown,
    30  		},
    31  		Severity: severity.Critical,
    32  	},
    33  	func(s *state.State) (results scan.Results) {
    34  		for _, firewall := range s.DigitalOcean.Compute.Firewalls {
    35  			var failed bool
    36  			for _, rule := range firewall.OutboundRules {
    37  				for _, address := range rule.DestinationAddresses {
    38  					if cidr.IsPublic(address.Value()) && cidr.CountAddresses(address.Value()) > 1 {
    39  						failed = true
    40  						results.Add(
    41  							"Egress rule allows access to multiple public addresses.",
    42  							address,
    43  						)
    44  					}
    45  				}
    46  			}
    47  			if !failed {
    48  				results.AddPassed(&firewall)
    49  			}
    50  		}
    51  		return
    52  	},
    53  )