AWS::WAF::XssMatchSet - Amazon CloudFormation
SyntaxPropertiesReturn valuesExamples
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AWS::WAF::XssMatchSet

Note

This is Amazon WAF Classic documentation. For more information, see Amazon WAF Classic in the developer guide.

For the latest version of Amazon WAF , use the Amazon WAFV2 API and see the Amazon WAF Developer Guide. With the latest version, Amazon WAF has a single set of endpoints for regional and global use.

A complex type that contains XssMatchTuple objects, which specify the parts of web requests that you want Amazon WAF to inspect for cross-site scripting attacks and, if you want Amazon WAF to inspect a header, the name of the header. If a XssMatchSet contains more than one XssMatchTuple object, a request needs to include cross-site scripting attacks in only one of the specified parts of the request to be considered a match.

Syntax

To declare this entity in your Amazon CloudFormation template, use the following syntax:

JSON

{
  "Type" : "AWS::WAF::XssMatchSet",
  "Properties" : {
      "Name" : String,
      "XssMatchTuples" : [ XssMatchTuple, ... ]
    }
}

YAML

Type: AWS::WAF::XssMatchSet
Properties: 
  Name: String
  XssMatchTuples: 
    - XssMatchTuple

Properties

Name

The name, if any, of the XssMatchSet.

Required: Yes

Type: String

Minimum: 1

Maximum: 128

Pattern: .*\S.*

Update requires: Replacement

XssMatchTuples

Specifies the parts of web requests that you want to inspect for cross-site scripting attacks.

Required: Yes

Type: List of XssMatchTuple

Update requires: No interruption

Return values

Ref

When you pass the logical ID of this resource to the intrinsic Ref function, Ref returns the resource physical ID, such as 1234a1a-a1b1-12a1-abcd-a123b123456.

For more information about using the Ref function, see Ref.

Examples

Define Which Part of a Request to Check for Cross-site Scripting

The following example looks for cross-site scripting in the URI or query string of an HTTP request.

JSON

"DetectXSS": {
  "Type": "AWS::WAF::XssMatchSet",
  "Properties": {
    "Name": "XssMatchSet",
    "XssMatchTuples": [
      {
        "FieldToMatch": {
          "Type": "URI"
        },
        "TextTransformation": "NONE"
      },
      {
        "FieldToMatch": {
          "Type": "QUERY_STRING"
        },
        "TextTransformation": "NONE"
      }
    ]
  }
}

YAML

DetectXSS: 
  Type: "AWS::WAF::XssMatchSet"
  Properties: 
    Name: "XssMatchSet"
    XssMatchTuples: 
      - 
        FieldToMatch: 
          Type: "URI"
        TextTransformation: "NONE"
      - 
        FieldToMatch: 
          Type: "QUERY_STRING"
        TextTransformation: "NONE"

Associate an XssMatchSet with a Web ACL Rule

The following example associates the DetectXSS match set with a web access control list (ACL) rule.

JSON

"XSSRule" : {
  "Type": "AWS::WAF::Rule",
  "Properties": {
    "Name": "XSSRule",
    "MetricName" : "XSSRule",
    "Predicates": [
      {
        "DataId" : {  "Ref" : "DetectXSS" },
        "Negated" : false,
        "Type" : "XssMatch"
      }
    ]
  }
}

YAML

XSSRule: 
  Type: "AWS::WAF::Rule"
  Properties: 
    Name: "XSSRule"
    MetricName: "XSSRule"
    Predicates: 
      - 
        DataId: 
          Ref: "DetectXSS"
        Negated: false
        Type: "XssMatch"

Create a Web ACL

The following example associates the XSSRule rule with a web ACL. The web ACL allows all requests except for ones that contain cross-site scripting in the URI or query string of an HTTP request.

JSON

"MyWebACL": {
  "Type": "AWS::WAF::WebACL",
  "Properties": {
    "Name": "Web ACL to block cross-site scripting",
    "DefaultAction": {
      "Type": "ALLOW"
    },
    "MetricName" : "DetectXSSWebACL",
    "Rules": [
      {
        "Action" : {
          "Type" : "BLOCK"
        },
        "Priority" : 1,
        "RuleId" : { "Ref" : "XSSRule" }
      }
    ]
  }
}

YAML

MyWebACL: 
  Type: "AWS::WAF::WebACL"
  Properties: 
    Name: "Web ACL to block cross-site scripting"
    DefaultAction: 
      Type: "ALLOW"
    MetricName: "DetectXSSWebACL"
    Rules: 
      - 
        Action: 
          Type: "BLOCK"
        Priority: 1
        RuleId: 
          Ref: "XSSRule"