![]() Pass tls any any -> any any (tls.sni content:"" startswith nocase endswith msg:"Permit HTTPS access to " sid:1000002 rev:1 )ĭrop tcp any any -> any any (flow:established,to_server msg:"Deny all other TCP traffic" sid: 1000003 rev:1 ) Stateful rules take into context the entire flow from start to finish, which affects how your rules are evaluated.įor example, consider the following IPS rule: For more information about rule order evaluation, see Rule actions in AWS Network Firewall in the AWS Network Firewall Developer Guide. However, a drop rule with a priority of 1 will always be processed after all pass rules have been evaluated, including those with a lower priority. The firewall also takes into consideration the order that the rules appear in the rule group, and the priority assigned to the rule, if any.įor example, a pass rule with a priority of 1 will be processed prior to a pass rule with a priority of 2. The engine stops processing when it finds a match. ![]() The stateful rules engine processes your rules in the order of their action setting, with pass rules processed first, then drop, then alert. Stateful rule inspection works differently. For example, if you need to automatically allow return traffic, this is not something a stateless policy is best suited for. However, it also means that the policy cannot take the greater context of a flow into consideration before making a decision. This has performance benefits, because the security policy makes a decision sooner. Stateless rules inspect each packet in isolation, without regard to factors such as the direction of traffic, or whether the packet is part of an existing, approved connection. Rules are processed in strict order based on the priority assigned to them, with lower numbered rules (for example, 1) taking precedence over higher numbered rules (for example, 100). When performing stateless inspection, all individual packets in a flow are evaluated against each rule present in your policy. The AWS Network Firewall uses a rules engine that processes rules differently depending on whether you are performing stateless or stateful inspection. Additionally, the demo firewall is configured to send alert logs to Amazon CloudWatch, so you’ll see the filtering done by stateful rule groups. The solution in this post uses route tables to send all network traffic to a firewall endpoint, as shown in Figure 1.ĭuring the walkthrough, you’ll add firewall rules to influence traffic flows to and from a web server running on Amazon Elastic Compute Cloud (Amazon EC2) in a protected subnet. ![]() In part 2 of this series, we will discuss how you can incorporate stateful rule groups with strict rule order and ability to set one or more default actions. Also, it offers an intrusion prevention system (IPS), which provides active traffic flow inspection to help you identify and block vulnerability exploits.īy following this blog post, part 1 in a 2-part series, you will deploy a demo AWS Network Firewall within your AWS account to interact, first-hand, with its rules engine. For encrypted web traffic, AWS Network Firewall inspects the domain name provided by the Server Name Indicator (SNI) during the Transport Layer Security (TLS) handshake. It supports inbound and outbound web filtering for unencrypted web traffic. The firewall scales automatically with your network traffic, and offers built-in redundancies designed to provide high availability.ĪWS Network Firewall offers a flexible rules engine that gives you the ability to write thousands of firewall rules for granular policy enforcement. AWS Network Firewall is a managed service that makes it easy to provide fine-grained network protections for all of your Amazon Virtual Private Clouds (Amazon VPCs) to ensure that your traffic is inspected, monitored, and logged.
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