AWS::NetworkFirewall::RuleGroup StatefulRule - AWS CloudFormation
SyntaxProperties

AWS::NetworkFirewall::RuleGroup StatefulRule

A single Suricata rules specification, for use in a stateful rule group. Use this option to specify a simple Suricata rule with protocol, source and destination, ports, direction, and rule options. For information about the Suricata Rules format, see Rules Format.

Syntax

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

JSON

{
  "Action" : String,
  "Header" : Header,
  "RuleOptions" : [ RuleOption, ... ]
}

Properties

Action

Defines what Network Firewall should do with the packets in a traffic flow when the flow matches the stateful rule criteria. For all actions, Network Firewall performs the specified action and discontinues stateful inspection of the traffic flow.

The actions for a stateful rule are defined as follows:

  • PASS - Permits the packets to go to the intended destination.

  • DROP - Blocks the packets from going to the intended destination and sends an alert log message, if alert logging is configured in the AWS::NetworkFirewall::Firewall AWS::NetworkFirewall::LoggingConfiguration.

  • REJECT - Drops traffic that matches the conditions of the stateful rule and sends a TCP reset packet back to sender of the packet. A TCP reset packet is a packet with no payload and a RST bit contained in the TCP header flags. REJECT is available only for TCP traffic.

  • ALERT - Permits the packets to go to the intended destination and sends an alert log message, if alert logging is configured in the AWS::NetworkFirewall::Firewall AWS::NetworkFirewall::LoggingConfiguration.

    You can use this action to test a rule that you intend to use to drop traffic. You can enable the rule with ALERT action, verify in the logs that the rule is filtering as you want, then change the action to DROP.

  • REJECT - Drops TCP traffic that matches the conditions of the stateful rule, and sends a TCP reset packet back to sender of the packet. A TCP reset packet is a packet with no payload and a RST bit contained in the TCP header flags. Also sends an alert log mesage if alert logging is configured in the AWS::NetworkFirewall::Firewall AWS::NetworkFirewall::LoggingConfiguration.

    REJECT isn't currently available for use with IMAP and FTP protocols.

Required: Yes

Type: String

Allowed values: PASS | DROP | ALERT | REJECT

Update requires: No interruption

Header

The stateful inspection criteria for this rule, used to inspect traffic flows.

Required: Yes

Type: Header

Update requires: No interruption

RuleOptions

Additional settings for a stateful rule, provided as keywords and settings.

Required: Yes

Type: Array of RuleOption

Update requires: No interruption