Add Custom Rule Set

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Creates a custom rule set that defines custom threat assessment criteria.

Key information:

• A custom rule set may contain up to 10 custom rules. Each directive object defines a custom rule via the sec_rule object.
• A custom rule may contain up to 6 sets of criteria to identify a malicious request. The root of the sec_rule object defines the first set of criteria. Define additional criteria via chained_rule objects.

• Define criteria by specifying an operator object and one or more variable object(s). A set of criteria is satisfied when at least one variable object results in a successful match.

  You may also transform the source string via the action object to simplify matching. For example, you may transform the source string to all lowercase characters.

• The type property determines the type of variable (e.g., REQUEST_HEADERS) through which malicious traffic will be identified. Define a value property within the match object to further restrict the comparison (e.g., User-Agent).

  View example.

  A request will satisfy the following configuration when the value corresponding to any of its request headers contains the word Windows:

  	...
  	"operator": {
  		"is_negated": false,
  		"is_regex": false,
  		"type": "CONTAINS",
  		"value": "Windows"
  	},
  	"variable": [{
  			"is_count": false,
  			"match": [{
  					"is_negated": false,
  					"is_regex": false,
  				}
  			],
  			"type": "REQUEST_HEADERS"
  		}
  	...

  The following code excerpt adds a value property to the match object that restricts the current variable (i.e., REQUEST_HEADERS) to User-Agent. This means that a request will only satisfy this configuration when the User-Agent request header contains the word Windows.

  	...
  	"operator": {
  		"is_negated": false,
  		"is_regex": false,
  		"type": "CONTAINS",
  		"value": "Windows"
  	},
  	"variable": [{
  			"is_count": false,
  			"match": [{
  					"is_negated": false,
  					"is_regex": false,
  					"value": "User-Agent"
  				}
  			],
  			"type": "REQUEST_HEADERS"
  		}
  	...

• An alternative to a string comparison is to count the number of times that a variable is found within a request. This requires the following configuration:

  • Set the is_count property to true.
  • From within the operator object, set the type property to EQ and then set the value property to the number of times that the variable must be found before being considered malicious traffic.
  View example.

  A request will satisfy the following configuration when it contains 2 User-Agent request headers:

  	...
  	"operator": {
  		"is_negated": false,
  		"is_regex": false,
  		"type": "EQ",
  		"value": "2"
  	},
  	"variable": [{
  			"is_count": false,
  			"match": [{
  					"is_negated": false,
  					"is_regex": false,
  					"value": "User-Agent"
  				}
  			],
  			"type": "REQUEST_HEADERS"
  		}
  	...

• A request will be flagged as malicious traffic when all of the following conditions are met:

  • The request satisfies at least one variable object in the root of the sec_rule object.
  • The request satisfies at least one variable object in each chained_rule object.

Request

A request to create a custom rule set is described below.

HTTP Method	Request URI
POST	https://api.edgecast.com/v2/mcc/customers/AccountNumber/waf/v1.0/rules

Define the following variable when submitting the above request:

VariableA variable represents a value that must be replaced. A variable consists of either a URL segment (e.g., "0001" in /0001/) or a query string value (e.g., "3" in mediaTypes=3).	Description
AccountNumber Required	Replace this variable with a customer account number. This account number may be found in the upper right-hand corner of the MCC.

Request Headers

This endpointIdentifies a request's connection point to our REST API service. only takes advantage of common request headers.

Request Body

Pass the following request body parameters:

Name	Data Type	Description
directive Required	Array Object	Contains custom rules. Each directive object defines a custom rule via the sec_rule object. You may create up to 10 custom rules.
name	String	Indicates the name of the custom rule.

sec_rule Object

The sec_rule object describes a custom rule using the following properties:

Name	Data Type	Description
action Required	Object	Determines whether the string identified in a variable object will be transformed and the metadata that will be assigned to malicious traffic.
chained_rule	Array Object	Contains additional criteria that must be satisfied to identify a malicious request. You may add up to 5 chained_rule objects per custom rule.
name	String	Indicates the name assigned to this custom rule.
operator Required	Object	Indicates the comparison that will be performed against the request element(s) identified within a variable object.
variable Required	Array Object	Contains criteria that identifies a request element.

variable Array

The variable array identifies each request element for which a comparison will be made using the following properties:

Name	Data Type	Description
type Required	String	Determines the request element that will be assessed. Valid values are: ARGS_POSTIdentifies key-value pairs within a POST request. | GEOIdentifies the country from which the request originated by its 2 character country code. | QUERY_STRING | REMOTE_ADDRIdentifies the client's IP address. | REMOTE_ASN | REQUEST_BODYIdentifies a URL-encoded request body. | REQUEST_FILENAMERequest URL Path: Match against the request's URL path. Define a URL path that starts directly after the hostname. Exclude the protocol, hostname, and query string when defining this property. | REQUEST_COOKIES | REQUEST_HEADERS | REQUEST_METHOD | REQUEST_URI If a request element consists of one or more key-value pairs, then you may identify a key via a match object. If is_count has been disabled, then you may identify a specific value via the operator object.
match	Array Object	Contains comparison settings for the request element identified by the type property.
is_count	Boolean	Determines whether a comparison will be performed between the operator object and a string value or the number of matches found. Valid values are: true: A counter will increment whenever the request element defined by this variable object is found. The operator object will perform a comparison against this number. If you enable is_count, then you must also set the type property to EQ. false: The operator object will perform a comparison against the string value derived from the request element defined by this variable object.

match Array

The match array determines the comparison conditions for the request element identified by the type property.

Name	Data Type	Description
is_negated	Boolean	Determines whether this condition is satisfied when the request element identified by the variable object is found or not found. True: Not found Enabling this property requires an initial object that sets both the is_negated and is_regex properties to False. ... [{ "is_negated": false, "is_regex": false }, { "is_negated": true, ... Omitting this initial object results in an invalid configuration. False: Found
is_regex	Boolean	Determines whether the value property will be interpreted as a regular expression. Valid values are: True: Regular expression False: Default value. Literal value.
value	String	Restricts the match condition defined by the type property to the specified value. Example: If the type property is set to REQUEST_HEADERS and this property is set to User-Agent, then this match condition is restricted to the User-Agent request header. If the value property is omitted, then this match condition applies to all request headers.

action Object

The action object determines whether the value derived from the request element identified in a variable object will be transformed and the metadata that will be used to identify malicious traffic.

Name	Data Type	Description
id	String	Determines the custom ID that will be assigned to this custom rule. This custom ID is exposed via the Threats Dashboard. Valid values fall within this range: 66000000 - 66999999 This field is only applicable for the action object that resides in the root of the sec_rule object. Default Value: Random number
msg	String	Determines the rule message that will be assigned to this custom rule. This message is exposed via the Threats Dashboard. This field is only applicable for the action object that resides in the root of the sec_rule object. Default Value: Blank
t	Array String values	Determines the set of transformations that will be applied to the value derived from the request element identified in a variable object (i.e., source value). Transformations are always applied to the source value, regardless of the number of transformations that have been defined. Valid values are: NONE: Indicates that the source value should not be modified. LOWERCASE: Indicates that the source value should be converted to lowercase characters. URLDECODE: Indicates that the source value should be URL decoded. This transformation is useful when the source value has been URL encoded twice. REMOVENULLS: Indicates that null values should be removed from the source value. A criterion is satisfied if the source value or any of the modified string values meet the conditions defined by the operator object.

operator Object

The operator object describes the comparison that will be performed on the request element(s) defined within a variable object using the following properties:

Name	Data Type	Description
is_negated	Boolean	Indicates whether a condition will be satisfied when the value derived from the request element defined within a variable object matches or does not match the value property. Valid values are: True: Does not match False: Matches
type Required	String	Indicates how the system will interpret the comparison between the value property and the value derived from the request element defined within a variable object. Valid values are: RX: Indicates that the string value derived from the request element must satisfy the regular expression defined in the value property. STREQ: Indicates that the string value derived from the request element must be an exact match to the value property. CONTAINS: Indicates that the value property must contain the string value derived from the request element. BEGINSWITH: Indicates that the value property must start with the string value derived from the request element. ENDSWITH: Indicates that the value property must end with the string value derived from the request element. EQ: Indicates that the number derived from the variable object must be an exact match to the value property. You should only use EQ when the is_count property has been enabled. IPMATCH: Requires that the request's IP address either be contained by an IP block or be an exact match to an IP address defined in the value property. Only use IPMATCH with the REMOTE_ADDR variable.
value	String	Indicates a value that will be compared against the string or number value derived from the request element defined within a variable object. If you are identifying traffic by URL path (REQUEST_URI), then you should specify a URL path pattern that starts directly after the hostname. Exclude a protocol or a hostname when defining this property. Sample values: /marketing /800001/mycustomerorigin If you are identifying traffic by IP address (REMOTE_ADDR / IPMATCH), then you should use a comma-delimited list to specify multiple IP blocks and IP addresses. Sample value: 192.0.2.20,203.0.113.0/24,2001:DB8::/32

chained_rule Array

Each object within the chained_rule array describes an additional set of criteria that must be satisfied in order to identify a malicious request.

Name	Data Type	Description
action	Object	Determines whether the string value derived from the request element identified in a variable object will be transformed and the metadata that will be used to identify malicious traffic.
operator	Object	Indicates the comparison that will be performed on the string value(s) derived from the request element(s) defined within the variable array.
variable	Array Object	Identifies each request element for which a comparison will be made.

Response

The response to the above request includes an HTTP status code, response headers, and a response body.

Status Code

A status code indicates whether the request was successfully performed.

Response Headers

The response for this endpoint only includes standard HTTP response headers.

View common response headers.

Response Body

The response body for a successful request contains the following parameters:

Name	Data Type	Description
id	String	Indicates the system-defined ID for the resource.
status	String	Returns success.
success	Boolean	Returns true.

Errors

The response body for an unsuccessful request contains the following parameters:

Name	Data Type	Description
success	Boolean	Returns false.
errors	Array Objects	Contains one or more error(s).

errors Array

The errors array describes each error that occurred using the following properties:

Name	Data Type	Description
code	Integer	Indicates the HTTP status code for the error.
message	String	Indicates the description for the error that occurred.

Sample Request and Response (JSON)

A sample JSON request is shown below.

{
	"directive": [{
			"sec_rule": {
				"action": {
					"id": "123456",
					"msg": "Invalid user agent.",
					"t": [
						"NONE"
					]
				},
				"operator": {
					"is_negated": false,
					"is_regex": false,
					"type": "CONTAINS",
					"value": "bot"
				},
				"variable": [{
						"is_count": false,
						"match": [{
								"is_negated": false,
								"is_regex": false,
								"value": "User-Agent"
							}
						],
						"type": "REQUEST_HEADERS"
					}
				]
			}
		}
	],
	"name": "My-Rule"
}

A sample JSON response is shown below.

{
	"id": "N8NxAJOA",
	"status": "success",
	"success": true
}