compute

Documentation

Index

• Variables

Variables

var CheckDisablePasswordAuthentication = rules.Register(
	rules.Rule{
		AVDID:       "AVD-AZU-0039",
		Provider:    providers.AzureProvider,
		Service:     "compute",
		ShortCode:   "disable-password-authentication",
		Summary:     "Password authentication should be disabled on Azure virtual machines",
		Impact:      "Using password authentication is less secure that ssh keys may result in compromised servers",
		Resolution:  "Use ssh authentication for virtual machines",
		Explanation: `Access to virtual machines should be authenticated using SSH keys. Removing the option of password authentication enforces more secure methods while removing the risks inherent with passwords.`,
		Links:       []string{},
		Terraform: &rules.EngineMetadata{
			GoodExamples:        terraformDisablePasswordAuthenticationGoodExamples,
			BadExamples:         terraformDisablePasswordAuthenticationBadExamples,
			Links:               terraformDisablePasswordAuthenticationLinks,
			RemediationMarkdown: terraformDisablePasswordAuthenticationRemediationMarkdown,
		},
		Severity: severity.High,
	},
	func(s *state.State) (results rules.Results) {
		for _, vm := range s.Azure.Compute.LinuxVirtualMachines {
			if vm.IsUnmanaged() {
				continue
			}
			if vm.OSProfileLinuxConfig.DisablePasswordAuthentication.IsFalse() {
				results.Add(
					"Linux virtual machine allows password authentication.",
					vm.OSProfileLinuxConfig.DisablePasswordAuthentication,
				)
			} else {
				results.AddPassed(&vm)
			}
		}
		return
	},
)

var CheckEnableDiskEncryption = rules.Register(
	rules.Rule{
		AVDID:       "AVD-AZU-0038",
		Provider:    providers.AzureProvider,
		Service:     "compute",
		ShortCode:   "enable-disk-encryption",
		Summary:     "Enable disk encryption on managed disk",
		Impact:      "Data could be read if compromised",
		Resolution:  "Enable encryption on managed disks",
		Explanation: `Manage disks should be encrypted at rest. When specifying the <code>encryption_settings</code> block, the enabled attribute should be set to <code>true</code>.`,
		Links: []string{
			"https://docs.microsoft.com/en-us/azure/virtual-machines/linux/disk-encryption",
		},
		Terraform: &rules.EngineMetadata{
			GoodExamples:        terraformEnableDiskEncryptionGoodExamples,
			BadExamples:         terraformEnableDiskEncryptionBadExamples,
			Links:               terraformEnableDiskEncryptionLinks,
			RemediationMarkdown: terraformEnableDiskEncryptionRemediationMarkdown,
		},
		Severity: severity.High,
	},
	func(s *state.State) (results rules.Results) {
		for _, disk := range s.Azure.Compute.ManagedDisks {
			if disk.IsUnmanaged() {
				continue
			}
			if disk.Encryption.Enabled.IsFalse() {
				results.Add(
					"Managed disk is not encrypted.",
					disk.Encryption.Enabled,
				)
			} else {
				results.AddPassed(&disk)
			}
		}
		return
	},
)

var CheckNoSecretsInCustomData = rules.Register(
	rules.Rule{
		AVDID:       "AVD-AZU-0037",
		Provider:    providers.AzureProvider,
		Service:     "compute",
		ShortCode:   "no-secrets-in-custom-data",
		Summary:     "Ensure that no sensitive credentials are exposed in VM custom_data",
		Impact:      "Sensitive credentials in custom_data can be leaked",
		Resolution:  "Don't use sensitive credentials in the VM custom_data",
		Explanation: `When creating Azure Virtual Machines, custom_data is used to pass start up information into the EC2 instance. This custom_dat must not contain access key credentials.`,
		Links:       []string{},
		Terraform: &rules.EngineMetadata{
			GoodExamples:        terraformNoSecretsInCustomDataGoodExamples,
			BadExamples:         terraformNoSecretsInCustomDataBadExamples,
			Links:               terraformNoSecretsInCustomDataLinks,
			RemediationMarkdown: terraformNoSecretsInCustomDataRemediationMarkdown,
		},
		Severity: severity.Medium,
	},
	func(s *state.State) (results rules.Results) {
		for _, vm := range s.Azure.Compute.LinuxVirtualMachines {
			if vm.IsUnmanaged() {
				continue
			}
			if result := scanner.Scan(vm.CustomData.Value()); result.TransgressionFound {
				results.Add(
					"Virtual machine includes secret(s) in custom data.",
					vm.CustomData,
				)
			} else {
				results.AddPassed(&vm)
			}
		}
		for _, vm := range s.Azure.Compute.WindowsVirtualMachines {
			if vm.IsUnmanaged() {
				continue
			}
			if result := scanner.Scan(vm.CustomData.Value()); result.TransgressionFound {
				results.Add(
					"Virtual machine includes secret(s) in custom data.",
					vm.CustomData,
				)
			} else {
				results.AddPassed(&vm)
			}
		}
		return
	},
)