PSRule.Rules.Azure

1.20.1

rules/Azure.AKS.Rule.ps1

                                # Copyright (c) Microsoft Corporation.

# Licensed under the MIT License.

#

# Validation rules for Azure Kubernetes Service (AKS)

#

# Synopsis: AKS control plane and nodes pools should use a current stable release.

Rule 'Azure.AKS.Version' -Ref 'AZR-000015' -Type 'Microsoft.ContainerService/managedClusters', 'Microsoft.ContainerService/managedClusters/agentPools' -Tag @{ release = 'GA'; ruleSet = '2020_06' } {

    $minVersion = $Configuration.GetValueOrDefault('Azure_AKSMinimumVersion', $Configuration.AZURE_AKS_CLUSTER_MINIMUM_VERSION);

    if ($PSRule.TargetType -eq 'Microsoft.ContainerService/managedClusters') {

        $Assert.Version($TargetObject, 'Properties.kubernetesVersion', ">=$minVersion");

    }

    elseif ($PSRule.TargetType -eq 'Microsoft.ContainerService/managedClusters/agentPools') {

        if (!$Assert.HasField($TargetObject, 'Properties.orchestratorVersion').Result) {

            $Assert.Pass();

        }

        else {

            $Assert.Version($TargetObject, 'Properties.orchestratorVersion', ">=$minVersion");

        }

    }

}

# Synopsis: AKS agent pools should run the same Kubernetes version as the cluster

Rule 'Azure.AKS.PoolVersion' -Ref 'AZR-000016' -Type 'Microsoft.ContainerService/managedClusters' -Tag @{ release = 'GA'; ruleSet = '2020_06' } {

    $clusterVersion = $TargetObject.Properties.kubernetesVersion;

    $agentPools = @(GetAgentPoolProfiles);

    if ($agentPools.Length -eq 0) {

        return $Assert.Pass();

    }

    foreach ($agentPool in $agentPools) {

        $Assert.HasDefaultValue($agentPool, 'orchestratorVersion', $clusterVersion).

            Reason($LocalizedData.AKSNodePoolVersion, $agentPool.name, $agentPool.orchestratorVersion);

    }

}

# Synopsis: AKS node pools should use scale sets

Rule 'Azure.AKS.PoolScaleSet' -Ref 'AZR-000017' -Type 'Microsoft.ContainerService/managedClusters', 'Microsoft.ContainerService/managedClusters/agentPools' -Tag @{ release = 'GA'; ruleSet = '2020_06' } {

    $agentPools = @(GetAgentPoolProfiles);

    if ($agentPools.Length -eq 0) {

        return $Assert.Pass();

    }

    foreach ($agentPool in $agentPools) {

        $Assert.HasFieldValue($agentPool, 'type', 'VirtualMachineScaleSets').

            Reason($LocalizedData.AKSNodePoolType, $agentPool.name);

    }

}

# Synopsis: AKS nodes should use a minimum number of pods

Rule 'Azure.AKS.NodeMinPods' -Ref 'AZR-000018' -Type 'Microsoft.ContainerService/managedClusters', 'Microsoft.ContainerService/managedClusters/agentPools' -Tag @{ release = 'GA'; ruleSet = '2020_06' } {

    $agentPools = @(GetAgentPoolProfiles);

    if ($agentPools.Length -eq 0) {

        return $Assert.Pass();

    }

    foreach ($agentPool in $agentPools) {

        $Assert.GreaterOrEqual($agentPool, 'maxPods', $Configuration.Azure_AKSNodeMinimumMaxPods);

    }

} -Configure @{ Azure_AKSNodeMinimumMaxPods = 50 }

# Synopsis: Use Autoscaling to ensure AKS cluster is running efficiently with the right number of nodes for the workloads present.

Rule 'Azure.AKS.AutoScaling' -Ref 'AZR-000019' -Type 'Microsoft.ContainerService/managedClusters', 'Microsoft.ContainerService/managedClusters/agentPools' -Tag @{ release = 'GA'; ruleSet = '2021_09'; } {

    $agentPools = @(GetAgentPoolProfiles);

    if ($agentPools.Length -eq 0) {

        return $Assert.Pass();

    }

    foreach ($agentPool in $agentPools) {

        # Autoscaling only available on virtual machine scale sets

        if ($Assert.HasFieldValue($agentPool, 'type', 'VirtualMachineScaleSets').Result) {

            $Assert.HasFieldValue($agentPool, 'enableAutoScaling', $True).Reason($LocalizedData.AKSAutoScaling, $agentPool.name);

        }

        else {

            $Assert.Pass()

        }

    }

}

# Synopsis: AKS clusters using Azure CNI should use large subnets to reduce IP exhaustion issues.

Rule 'Azure.AKS.CNISubnetSize' -Ref 'AZR-000020' -If { IsExport } -With 'Azure.AKS.AzureCNI' -Tag @{ release = 'GA'; ruleSet = '2021_09'; } {

    $clusterSubnets = @(GetSubResources -ResourceType 'Microsoft.Network/virtualNetworks/subnets');

    if ($clusterSubnets.Length -eq 0) {

        return $Assert.Pass();

    }

    $configurationMinimumSubnetSize = $Configuration.AZURE_AKS_CNI_MINIMUM_CLUSTER_SUBNET_SIZE;

    foreach ($subnet in $clusterSubnets) {

        $subnetAddressPrefixSize = [int]$subnet.Properties.addressPrefix.Split('/')[-1];

        $Assert.LessOrEqual($subnetAddressPrefixSize, '.', $configurationMinimumSubnetSize).

            Reason(

                $LocalizedData.AKSAzureCNI, 

                $subnet.Name, 

                $configurationMinimumSubnetSize

            );

    }

} -Configure @{ AZURE_AKS_CNI_MINIMUM_CLUSTER_SUBNET_SIZE = 23 }

# Synopsis: AKS clusters deployed with virtual machine scale sets should use availability zones in supported regions for high availability.

Rule 'Azure.AKS.AvailabilityZone' -Ref 'AZR-000021' -Type 'Microsoft.ContainerService/managedClusters' -Tag @{ release = 'GA'; ruleSet = '2021_09'; } {

    $agentPools = @(GetAgentPoolProfiles);

    if ($agentPools.Length -eq 0) {

        return $Assert.Pass();

    }

    $virtualMachineScaleSetProvider = [PSRule.Rules.Azure.Runtime.Helper]::GetResourceType('Microsoft.Compute', 'virtualMachineScaleSets');

    $configurationZoneMappings = $Configuration.AZURE_AKS_ADDITIONAL_REGION_AVAILABILITY_ZONE_LIST;

    $providerZoneMappings = $virtualMachineScaleSetProvider.ZoneMappings;

    $mergedAvailabilityZones = PrependConfigurationZoneWithProviderZone -ConfigurationZone $configurationZoneMappings -ProviderZone $providerZoneMappings;

    $availabilityZones = GetAvailabilityZone -Location $TargetObject.Location -Zone $mergedAvailabilityZones;

    if (-not $availabilityZones) {

        return $Assert.Pass();

    }

    $joinedZoneString = $availabilityZones -join ', ';

    foreach ($agentPool in $agentPools) {

        # Availability zones only available on virtual machine scale sets

        if ($Assert.HasFieldValue($agentPool, 'type', 'VirtualMachineScaleSets').Result) {

            $Assert.HasFieldValue($agentPool, 'availabilityZones').

                Reason($LocalizedData.AKSAvailabilityZone, $agentPool.name, $TargetObject.Location, $joinedZoneString);

        }

        else {

            $Assert.Pass();

        }

    }

} -Configure @{ AZURE_AKS_ADDITIONAL_REGION_AVAILABILITY_ZONE_LIST = @() }

# Synopsis: AKS clusters should collect security-based audit logs to assess and monitor the compliance status of workloads.

Rule 'Azure.AKS.AuditLogs' -Ref 'AZR-000022' -Type 'Microsoft.ContainerService/managedClusters' -Tag @{ release = 'GA'; ruleSet = '2021_09'; } {

    $diagnosticLogs = @(GetSubResources -ResourceType 'Microsoft.Insights/diagnosticSettings', 'Microsoft.ContainerService/managedClusters/providers/diagnosticSettings');

    $Assert.Greater($diagnosticLogs, '.', 0).Reason($LocalizedData.DiagnosticSettingsNotConfigured, $TargetObject.name);

    foreach ($setting in $diagnosticLogs) {

        $kubeAuditEnabledLog = @($setting.Properties.logs | Where-Object {

            $_.category -in 'kube-audit', 'kube-audit-admin' -and $_.enabled

        });

        $guardEnabledLog = @($setting.Properties.logs | Where-Object {

            $_.category -eq 'guard' -and $_.enabled

        });

        $auditLogsEnabled = $Assert.Greater($kubeAuditEnabledLog, '.', 0).Result -and

                            $Assert.Greater($guardEnabledLog, '.', 0).Result;

        $Assert.Create($auditLogsEnabled, $LocalizedData.AKSAuditLogs, $setting.name);

    }

}

# Synopsis: AKS clusters should collect platform diagnostic logs to monitor the state of workloads.

Rule 'Azure.AKS.PlatformLogs' -Ref 'AZR-000023' -Type 'Microsoft.ContainerService/managedClusters' -Tag @{ release = 'GA'; ruleSet = '2021_09'; } {

    $configurationLogCategoriesList = $Configuration.GetStringValues('AZURE_AKS_ENABLED_PLATFORM_LOG_CATEGORIES_LIST');

    if ($configurationLogCategoriesList.Length -eq 0) {

        return $Assert.Pass();

    }

    $diagnosticLogs = @(GetSubResources -ResourceType 'Microsoft.Insights/diagnosticSettings', 'Microsoft.ContainerService/managedClusters/providers/diagnosticSettings');

    $Assert.Greater($diagnosticLogs, '.', 0).Reason($LocalizedData.DiagnosticSettingsNotConfigured, $TargetObject.name);

    $availableLogCategories = @{

        Logs = @(

            'cluster-autoscaler', 

            'kube-apiserver', 

            'kube-controller-manager', 

            'kube-scheduler'

        )

        Metrics = @(

            'AllMetrics'

        )

    }

    $configurationLogCategories = @($configurationLogCategoriesList | Where-Object {

        $_ -in $availableLogCategories.Logs

    });

    $configurationMetricCategories = @($configurationLogCategoriesList | Where-Object {

        $_ -in $availableLogCategories.Metrics

    });

    $logCategoriesNeeded = [System.Math]::Min(

        $configurationLogCategories.Length, 

        $availableLogCategories.Logs.Length

    );

    $metricCategoriesNeeded = [System.Math]::Min(

        $configurationMetricCategories.Length, 

        $availableLogCategories.Metrics.Length

    );

    $logCategoriesJoinedString = $configurationLogCategoriesList -join ', ';

    foreach ($setting in $diagnosticLogs) {

        $platformLogs = @($setting.Properties.logs | Where-Object {

            $_.enabled -and

            $_.category -in $configurationLogCategories -and

            $_.category -in $availableLogCategories.Logs

        });

        $metricLogs = @($setting.Properties.metrics | Where-Object {

            $_.enabled -and 

            $_.category -in $configurationMetricCategories -and

            $_.category -in $availableLogCategories.Metrics

        });

        $platformLogsEnabled = $Assert.HasFieldValue($platformLogs, 'Length', $logCategoriesNeeded).Result -and 

                               $Assert.HasFieldValue($metricLogs, 'Length', $metricCategoriesNeeded).Result

        $Assert.Create(

            $platformLogsEnabled, 

            $LocalizedData.AKSPlatformLogs, 

            $setting.name, 

            $logCategoriesJoinedString

        );

    }

} -Configure @{

    AZURE_AKS_ENABLED_PLATFORM_LOG_CATEGORIES_LIST = @(

        'cluster-autoscaler', 

        'kube-apiserver', 

        'kube-controller-manager', 

        'kube-scheduler',

        'AllMetrics'

    )

}

# Synopsis: AKS clusters should have Uptime SLA enabled to ensure availability of control plane components for production workloads.

Rule 'Azure.AKS.UptimeSLA' -Ref 'AZR-000285' -Type 'Microsoft.ContainerService/managedClusters' -Tag @{ release = 'GA'; ruleSet = '2022_09'; } {

    $Assert.Contains($TargetObject, 'sku.tier', 'Paid');

}

# Synopsis: AKS clusters should use ephemeral OS disks which can provide lower read/write latency, along with faster node scaling and cluster upgrades.

Rule 'Azure.AKS.EphemeralOSDisk' -Ref 'AZR-000287' -Level Warning -Type 'Microsoft.ContainerService/managedClusters', 'Microsoft.ContainerService/managedClusters/agentPools' -Tag @{ release = 'GA'; ruleSet = '2022_09' } {

    $agentPools = @(GetAgentPoolProfiles);

    if ($agentPools.Length -eq 0) {

        return $Assert.Pass();

    }

    foreach ($agentPool in $agentPools) {

        $Assert.HasDefaultValue($agentPool, 'osDiskType', 'Ephemeral').

        ReasonIf($agentPool.osDiskType, $LocalizedData.AKSEphemeralOSDiskNotConfigured);

    }

}

#region Helper functions

function global:GetAgentPoolProfiles {

    [CmdletBinding()]

    [OutputType([PSObject])]

    param ()

    process {

        if ($PSRule.TargetType -eq 'Microsoft.ContainerService/managedClusters') {

            $TargetObject.Properties.agentPoolProfiles;

            @(GetSubResources -ResourceType 'Microsoft.ContainerService/managedClusters/agentPools' | ForEach-Object {

                [PSCustomObject]@{

                    name = $_.name

                    type = $_.properties.type

                    maxPods = $_.properties.maxPods

                    orchestratorVersion = $_.properties.orchestratorVersion

                    enableAutoScaling = $_.properties.enableAutoScaling

                    availabilityZones = $_.properties.availabilityZones

                    osDiskType = $_.properties.osDiskType

                }

            });

        }

        elseif ($PSRule.TargetType -eq 'Microsoft.ContainerService/managedClusters/agentPools') {

            [PSCustomObject]@{

                name = $TargetObject.name

                type = $TargetObject.properties.type

                maxPods = $TargetObject.properties.maxPods

                orchestratorVersion = $TargetObject.properties.orchestratorVersion

                enableAutoScaling = $TargetObject.properties.enableAutoScaling

                availabilityZones = $TargetObject.properties.availabilityZones

                osDiskType = $TargetObject.properties.osDiskType

            }

        }

    }

}

#endregion Helper functions

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