Question

我找不到任何关于如何通过 CloudFormation 将WAF与ALB相关联的示例或文档。据说可能通过这个新闻公告https://aws.amazon.com/about-aws/whats-new/2017/05/cloudformation-support-for-aws-waf-on-alb/，但我发现没有任何东西可以说明如何。使用CloudFront而不是ALB已有详细记录，但我没有找到关于使用ALB（通过CloudFormation）的单个示例。

更新：我不需要一个完整的示例来为我完成整个设置，但至少需要一个片段来指出WAF如何知道与ALB关联，反之亦然。这种联系缺失了。

Answer 1

为了解决这个问题，我浏览了他们的发布历史，发现了更新后的CloudFormation资源，以支持WAF＆amp; ALB http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/ReleaseHistory.html 从那里我可以推断出链接组件是一个映射WAF和ALB的WebACLAssociation。但这也要求您必须使用WAFRegional而不是正常的WebACL。到目前为止，它似乎只意味着在整个代码中将:: WAF更改为:: WAFRegional。

WAFRegional （AWS :: WAFRegional :: WebACL）： http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-wafregional-webacl.html

"MyWebACL": {
  "Type": "AWS::WAFRegional::WebACL",
  "Properties": {
    "Name": "WebACL to with three rules",
    "DefaultAction": {
      "Type": "ALLOW"
    },
    "MetricName" : "MyWebACL",
    "Rules": [
      {
        "Action" : {
          "Type" : "BLOCK"
        },
        "Priority" : 1,
        "RuleId" : { "Ref" : "MyRule" }
      },
      {
        "Action" : {
          "Type" : "BLOCK"
        },
        "Priority" : 2,
        "RuleId" : { "Ref" : "BadReferersRule" }
      },
      {
        "Action" : {
          "Type" : "BLOCK"
        },
        "Priority" : 3,
        "RuleId" : { "Ref" : "SqlInjRule" }
      }
    ]
  }      
}

WebACLAssociation （AWS :: WAFRegional :: WebACLAssociation）http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-wafregional-webaclassociation.html

    "MyWebACLAssociation": {
  "Type": "AWS::WAFRegional::WebACLAssociation",
  "Properties": {
    "ResourceArn": { "Ref": "MyLoadBalancer" },
    "WebACLId": { "Ref": "MyWebACL" }
  }
}

Answer 2

下面是YAML格式的示例。

   Resources:
    WafAcldev:
     DependsOn: Whitelist
     DependsOn: WafRule
     Type: AWS::WAF::WebACL
     Condition: CreateDEVResources
     Properties:
      DefaultAction:
        Type: "BLOCK"
      MetricName: test
      Name: test
      Rules:
        -
          Action:
            Type: "ALLOW"
          Priority: 1
          RuleId: !Ref WafRule

    WafRule:
        DependsOn: WhitelistIPdev
        Type: AWS::WAF::Rule
        Condition: CreateDEVResources
        Properties:
          MetricName: test
          Name: test
          Predicates:
            -
              DataId:
               Ref: "Whitelist"
              Negated: false
              Type: "IPMatch"

    MyWebACLAssociation:
          Type: "AWS::WAFRegional::WebACLAssociation"
          Properties:
            ResourceArn: arn:aws:elasticloadbalancing:us-east-2:123456789012:listener/app/my-load-balancer/1234567890123456/1234567890123456
            WebACLId:
              Ref: WafAcldev
    Whitelist:
        Type: AWS::WAF::IPSet
        Condition: CreateDEVResources
        Properties:
          Name: "IPSet for Whitelisted IP adresses"
          IPSetDescriptors:
            -
             Type: "IPV4"
             Value: "213.126.223.11/32"
            -

如何通过CloudFormation将AWS WAF添加到ALB

2 个答案: