通过 Azure PowerShell 在应用程序网关上使用自定义规则配置 Web 应用程序防火墙 v2

Artículo
09/19/2024

使用自定义规则，可为通过 Web 应用程序防火墙 (WAF) v2 传递的每个请求创建自己的规则。这些规则的优先级高于托管规则集中的其余规则。自定义规则具有一个操作（允许或阻止）、一个匹配条件和一个运算符以允许完全自定义。

本文创建使用自定义规则的应用程序网关 WAF v2。如果请求标头包含用户代理 evilbot，该自定义规则会阻止流量。

要查看更多自定义规则示例，请参阅创建和使用自定义 Web 应用程序防火墙规则

如果要按照本文使用一个可复制、粘贴和运行的连续脚本来运行 Azure PowerShell，请参阅 Azure 应用程序网关 PowerShell 示例。

先决条件

Azure PowerShell 模块

如果选择在本地安装并使用 Azure PowerShell，则此脚本需要安装 Azure PowerShell 模块 2.1.0 或更高版本。

若要查找版本，请运行 Get-Module -ListAvailable Az。如果需要进行升级，请参阅 Install Azure PowerShell module（安装 Azure PowerShell 模块）。
若要创建与 Azure 的连接，请运行 Connect-AzAccount -Environment AzureChinaCloud。

如果没有 Azure 订阅，可在开始前创建一个试用帐户。

示例脚本

设置变量

$rgname = "CustomRulesTest"

$location = "China North 2"

$appgwName = "WAFCustomRules"

创建资源组

$resourceGroup = New-AzResourceGroup -Name $rgname -Location $location

创建 VNet

$sub1 = New-AzVirtualNetworkSubnetConfig -Name "appgwSubnet" -AddressPrefix "10.0.0.0/24"

$sub2 = New-AzVirtualNetworkSubnetConfig -Name "backendSubnet" -AddressPrefix "10.0.1.0/24"

$vnet = New-AzvirtualNetwork -Name "Vnet1" -ResourceGroupName $rgname -Location $location `
  -AddressPrefix "10.0.0.0/16" -Subnet @($sub1, $sub2)

创建静态公共 VIP

$publicip = New-AzPublicIpAddress -ResourceGroupName $rgname -name "AppGwIP" `
  -location $location -AllocationMethod Static -Sku Standard

创建池和前端端口

$gwSubnet = Get-AzVirtualNetworkSubnetConfig -Name "appgwSubnet" -VirtualNetwork $vnet

$gipconfig = New-AzApplicationGatewayIPConfiguration -Name "AppGwIpConfig" -Subnet $gwSubnet

$fipconfig01 = New-AzApplicationGatewayFrontendIPConfig -Name "fipconfig" -PublicIPAddress $publicip

$pool = New-AzApplicationGatewayBackendAddressPool -Name "pool1" `
  -BackendIPAddresses testbackend1.chinanorth2.chinacloudapp.cn, testbackend2.chinanorth2.chinacloudapp.cn

$fp01 = New-AzApplicationGatewayFrontendPort -Name "port1" -Port 80

创建侦听器、HTTP 设置、规则和自动缩放

$listener01 = New-AzApplicationGatewayHttpListener -Name "listener1" -Protocol Http `
  -FrontendIPConfiguration $fipconfig01 -FrontendPort $fp01

$poolSetting01 = New-AzApplicationGatewayBackendHttpSettings -Name "setting1" -Port 80 `
  -Protocol Http -CookieBasedAffinity Disabled

$rule01 = New-AzApplicationGatewayRequestRoutingRule -Name "rule1" -RuleType basic `
  -BackendHttpSettings $poolSetting01 -HttpListener $listener01 -BackendAddressPool $pool -Priority 1000

$autoscaleConfig = New-AzApplicationGatewayAutoscaleConfiguration -MinCapacity 3

$sku = New-AzApplicationGatewaySku -Name WAF_v2 -Tier WAF_v2

创建两个自定义规则并将其应用于 WAF 策略

# Create a User-Agent header custom rule 
$variable = New-AzApplicationGatewayFirewallMatchVariable -VariableName RequestHeaders -Selector User-Agent
$condition = New-AzApplicationGatewayFirewallCondition -MatchVariable $variable -Operator Contains -MatchValue "evilbot" -Transform Lowercase -NegationCondition $False  
$rule = New-AzApplicationGatewayFirewallCustomRule -Name blockEvilBot -Priority 2 -RuleType MatchRule -MatchCondition $condition -Action Block -State Enabled
 
# Create a geo-match custom rule
$var2 = New-AzApplicationGatewayFirewallMatchVariable -VariableName RemoteAddr
$condition2 = New-AzApplicationGatewayFirewallCondition -MatchVariable $var2 -Operator GeoMatch -MatchValue "US"  -NegationCondition $False
$rule2 = New-AzApplicationGatewayFirewallCustomRule -Name allowUS -Priority 14 -RuleType MatchRule -MatchCondition $condition2 -Action Allow -State Enabled

# Create a firewall policy
$policySetting = New-AzApplicationGatewayFirewallPolicySetting -Mode Prevention -State Enabled
$wafPolicy = New-AzApplicationGatewayFirewallPolicy -Name wafpolicyNew -ResourceGroup $rgname -Location $location -PolicySetting $PolicySetting -CustomRule $rule,$rule2

创建应用程序网关

$appgw = New-AzApplicationGateway -Name $appgwName -ResourceGroupName $rgname `
  -Location $location -BackendAddressPools $pool `
  -BackendHttpSettingsCollection  $poolSetting01 `
  -GatewayIpConfigurations $gipconfig -FrontendIpConfigurations $fipconfig01 `
  -FrontendPorts $fp01 -HttpListeners $listener01 `
  -RequestRoutingRules $rule01 -Sku $sku -AutoscaleConfiguration $autoscaleConfig `
  -FirewallPolicy $wafPolicy

更新 WAF

创建 WAF 后，可以使用类似于以下代码的程序对其进行更新：

# Get the existing policy
$policy = Get-AzApplicationGatewayFirewallPolicy -Name $policyName -ResourceGroupName $RGname
# Add an existing rule named $rule
$policy.CustomRules.Add($rule)
# Update the policy
Set-AzApplicationGatewayFirewallPolicy -InputObject $policy

后续步骤

详细了解应用程序网关上的 Web 应用程序防火墙

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