使用 Azure PowerShell 升級 Web 應用程式防火牆策略

發行項
2025-05-04

此腳本可以輕鬆地從 WAF 配置或自訂規則的 WAF 策略過渡到完整的 WAF 策略。您可能會在門戶中看到一條警告，指出 升級到 WAF 策略，或者您可能需要新的 WAF 功能，例如 Geomatch 自定義規則、每網站 WAF 策略和每 URI WAF 策略，或機器人緩解規則集。要使用這些功能中的任何一個，您需要與應用程式閘道關聯的完整 WAF 策略。

有關創建新的 WAF 策略的詳細資訊，請參閱為應用程式閘道創建 Web 應用程式防火牆策略。有關遷移的資訊，請參閱升級到 WAF 策略。

使用遷移腳本升級到 WAF 策略

使用以下步驟執行遷移腳本：

打開以下 Cloud Shell 視窗，或從門戶中打開一個視窗。
將腳本複製到 Cloud Shell 視窗中並運行它。
該文稿要求提供訂閱ID、資源組名稱、與WAF配置關聯的應用程式閘道的名稱，以及您創建的新WAF策略的名稱。輸入這些輸入后，腳本將運行並創建新的WAF策略
驗證新的 WAF 策略是否與您的應用程式閘道關聯。轉到門戶中的 WAF 策略，然後選擇 「關聯的應用程式閘道 」選項卡。驗證應用程式閘道是否已與 WAF 策略關聯。

備註

如果存在以下條件，則腳本不會完成遷移：

整個規則集被禁用。要完成遷移，請確保未禁用整個規則組。

有關更多資訊，請參閱腳本中的 ValidateInput 函數。

<#PSScriptInfo
.DESCRIPTION
Will be used to upgrade to the application-gateway to a top level waf policy experience.

.VERSION 1.0

.GUID b6fedd43-ebd0-41ed-9847-4f1c1c43be22

.AUTHOR Venkat.Krishnan

.PARAMETER subscriptionId 
Subscription Id of where the resources are present.
.PARAMETER resourceGroupName
Resource-group where the resources are present.
.PARAMETER applicationGatewayName
Application-Gateway name
.PARAMETER wafPolicyName
Name of the web application firewall policy

.EXAMPLE
./migrateToWafPolicy.ps1 -subscriptionId  <your-subscription-id> -applicationGatewayName <your-appgw-name> -resourceGroupName <your-resource-group-name> -wafPolicyName <new-waf-policy-name>
#>

param(
    [Parameter(Mandatory=$true)]
    [string] $subscriptionId,
    [Parameter(Mandatory=$true)]
    [string] $resourceGroupName,
    [Parameter(Mandatory=$true)]
    [string] $applicationGatewayName,
    [Parameter(Mandatory=$true)]
    [string] $wafPolicyName
)

function ValidateInput ($appgwName, $resourceGroupName) {
    # Obtain the application-gateway
    $appgw = Get-AzApplicationGateway -Name $applicationGatewayName -ResourceGroupName $resourceGroupName
    if (-not $appgw) {
        Write-Error "ApplicationGateway: $applicationGatewayName is not present in ResourceGroup: $resourceGroupName"
        return $false
    }

    # Check if already have a global firewall policy
    if ($appgw.FirewallPolicy) {
        $fp = Get-AzResource -ResourceId $appgw.FirewallPolicy.Id
        if ($fp.PolicySettings) {
            Write-Error "ApplicationGateway: $applicationGatewayName already has a global firewall policy: $fp.Name. Please use portal for changing the policy."
            return $false
        }
    }

    if ($appgw.WebApplicationFirewallConfiguration) {
        # Throw an error, since ruleGroup disabled case can't be migrated now.
        if ($appgw.WebApplicationFirewallConfiguration.DisabledRuleGroups) {
            foreach ($disabled in $appgw.WebApplicationFirewallConfiguration.DisabledRuleGroups) {
                if ($disabled.Rules.Count -eq 0) {
                    $ruleGroupName = $disabled.RuleGroupName
                    Write-Error "The ruleGroup '$ruleGroupName' is disabled. Currently we can't upgrade to a firewall policy when an entire ruleGroup is disabled. This feature will be delivered shortly. To continue, kindly ensure the entire rulegroups are not disabled. "
                    return $false
                }
            }
        }
    }

    if ($appgw.Sku.Name -ne "WAF_v2" -or $appgw.Sku.Tier -ne "WAF_v2") {
        Write-Error " Cannot associate a firewall policy to application gateway :$applicationGatewayName since the Sku is not on WAF_v2"
        return $false
    }

    return $true
}

function Login() {
    $context = Get-AzContext
    if ($null -eq $context -or $null -eq $context.Account) {
        Login-AzAccount
    }
}

function createNewTopLevelWafPolicy ($subscriptionId, $resourceGroupName, $applicationGatewayName, $wafPolicyName) {
    Select-AzSubscription -Subscription $subscriptionId
    $retVal = ValidateInput -appgwName $applicationGatewayName -resourceGroupName $resourceGroupName
    if (!$retVal) {
        return
    }

    $appgw = Get-AzApplicationGateway -Name $applicationGatewayName -ResourceGroupName $resourceGroupName

    # Get the managedRule and PolicySettings
    $managedRule = New-AzApplicationGatewayFirewallPolicyManagedRule
    $policySetting = New-AzApplicationGatewayFirewallPolicySetting
    if ($appgw.WebApplicationFirewallConfiguration) {
        $ruleGroupOverrides = [System.Collections.ArrayList]@()
        if ($appgw.WebApplicationFirewallConfiguration.DisabledRuleGroups) {
            foreach ($disabled in $appgw.WebApplicationFirewallConfiguration.DisabledRuleGroups) {
                $rules = [System.Collections.ArrayList]@()
                if ($disabled.Rules.Count -gt 0) {
                    foreach ($rule in $disabled.Rules) {
                        $ruleOverride = New-AzApplicationGatewayFirewallPolicyManagedRuleOverride -RuleId $rule
                        $_ = $rules.Add($ruleOverride)
                    }
                }
                
                $ruleGroupOverride = New-AzApplicationGatewayFirewallPolicyManagedRuleGroupOverride -RuleGroupName $disabled.RuleGroupName -Rule $rules
                $_ = $ruleGroupOverrides.Add($ruleGroupOverride)
            }
        }

        $managedRuleSet = New-AzApplicationGatewayFirewallPolicyManagedRuleSet -RuleSetType $appgw.WebApplicationFirewallConfiguration.RuleSetType -RuleSetVersion $appgw.WebApplicationFirewallConfiguration.RuleSetVersion 
        if ($ruleGroupOverrides.Count -ne 0) {
            $managedRuleSet = New-AzApplicationGatewayFirewallPolicyManagedRuleSet -RuleSetType $appgw.WebApplicationFirewallConfiguration.RuleSetType -RuleSetVersion $appgw.WebApplicationFirewallConfiguration.RuleSetVersion -RuleGroupOverride $ruleGroupOverrides
        }
    
        $exclusions = [System.Collections.ArrayList]@()  
        if ($appgw.WebApplicationFirewallConfiguration.Exclusions) {
            foreach ($excl in $appgw.WebApplicationFirewallConfiguration.Exclusions) {
                if ($excl.MatchVariable -and $excl.SelectorMatchOperator -and $excl.Selector) {
                    $exclusionEntry = New-AzApplicationGatewayFirewallPolicyExclusion -MatchVariable  $excl.MatchVariable -SelectorMatchOperator $excl.SelectorMatchOperator -Selector $excl.Selector
                    $_ = $exclusions.Add($exclusionEntry)
                }

                if ($excl.MatchVariable -and !$excl.SelectorMatchOperator -and !$excl.Selecto) {
                    # Equals Any exclusion
                    $exclusionEntry = New-AzApplicationGatewayFirewallPolicyExclusion -MatchVariable  $excl.MatchVariable -SelectorMatchOperator "EqualsAny" -Selector "*"
                    $_ = $exclusions.Add($exclusionEntry)
                }
            }
        }
    
        $managedRule = New-AzApplicationGatewayFirewallPolicyManagedRule -ManagedRuleSet $managedRuleSet
        $exclCount = $exclusions.Count
        if ($exclCount -ne 0) {
            $managedRule = New-AzApplicationGatewayFirewallPolicyManagedRule -ManagedRuleSet $managedRuleSet -Exclusion $exclusions
        }

        
        $policySetting = New-AzApplicationGatewayFirewallPolicySetting -MaxFileUploadInMb $appgw.WebApplicationFirewallConfiguration.FileUploadLimitInMb -MaxRequestBodySizeInKb $appgw.WebApplicationFirewallConfiguration.MaxRequestBodySizeInKb -Mode Detection -State Disabled
        if ($appgw.WebApplicationFirewallConfiguration.FirewallMode -eq "Prevention") {
            $policySetting.Mode = "Prevention"
        }

        if ($appgw.WebApplicationFirewallConfiguration.Enabled) {
            $policySetting.State = "Enabled"
        }

        $policySetting.RequestBodyCheck = $appgw.WebApplicationFirewallConfiguration.RequestBodyCheck;
    }

    if ($appgw.FirewallPolicy) {
        $customRulePolicyId = $appgw.FirewallPolicy.Id
        $rg = Get-AzResourceGroup -Name $resourceGroupName
        $crPolicyName = $customRulePolicyId.Substring($customRulePolicyId.LastIndexOf("/") + 1)
        $customRulePolicy = Get-AzApplicationGatewayFirewallPolicy -ResourceGroupName $rg.ResourceGroupName -Name $crPolicyName
        $wafPolicy = New-AzApplicationGatewayFirewallPolicy -ResourceGroupName $rg.ResourceGroupName -Name $wafPolicyName -CustomRule $customRulePolicy.CustomRules -ManagedRule $managedRule -PolicySetting $policySetting -Location $appgw.Location
    } else { 
        $wafPolicy = New-AzApplicationGatewayFirewallPolicy -Name $wafPolicyName -ResourceGroupName $resourceGroupName -PolicySetting $policySetting -ManagedRule $managedRule -Location $appgw.Location
    }

    if (!$wafPolicy) {
        return
    }

    $appgw.WebApplicationFirewallConfiguration = $null
    $appgw.FirewallPolicy = $wafPolicy
    $appgw = Set-AzApplicationGateway -ApplicationGateway $appgw
    Write-Host " firewallPolicy: $wafPolicyName has been created/updated successfully and applied to applicationGateway: $applicationGatewayName!"
    return $wafPolicy
}

function Main() {
    Login
    $policy = createNewTopLevelWafPolicy -subscriptionId $subscriptionId -resourceGroupName $resourceGroupName -applicationGatewayName $applicationGatewayName -wafPolicyName $wafPolicyName
    return $policy
}

Main

後續步驟

深入了解 Web 應用程式防火牆 CRS 規則群組與規則。

共用方式為

使用 Azure PowerShell 升級 Web 應用程式防火牆策略

使用遷移腳本升級到 WAF 策略

後續步驟

意見反應

其他資源