Threat Monitoring

The Threat Monitoring page provides metrics and policy management for the GitLab application runtime security features. You can access these by navigating to your project’s Security & Compliance > Threat Monitoring page.

GitLab supports statistics for the following security features:

Web Application Firewall

The Web Application Firewall section provides metrics for the NGINX Ingress controller and ModSecurity firewall. This section has the following prerequisites:

If you are using custom Helm values for the Elastic Stack you have to configure Filebeat similarly to the vendored values.

The Web Application Firewall section displays the following information about your Ingress traffic:

  • The total amount of requests to your application
  • The proportion of traffic that is considered anomalous according to the configured rules
  • The request breakdown graph for the selected time interval

If a significant percentage of traffic is anomalous, you should investigate it for potential threats by examining the Web Application Firewall logs.

Container Network Policy

The Container Network Policy section provides packet flow metrics for your application’s Kubernetes namespace. This section has the following prerequisites:

If you’re using custom Helm values for Cilium, you must enable Hubble with flow metrics for each namespace by adding the following lines to your Cilium values:

global:
  hubble:
    enabled: true
    metrics:
      enabled:
        - 'flow:sourceContext=namespace;destinationContext=namespace'

The Container Network Policy section displays the following information about your packet flow:

  • The total amount of the inbound and outbound packets
  • The proportion of packets dropped according to the configured policies
  • The per-second average rate of the forwarded and dropped packets accumulated over time window for the requested time interval

If a significant percentage of packets is dropped, you should investigate it for potential threats by examining the Cilium logs.

Container Network Policy management

The Threat Monitoring page’s Policy tab displays deployed network policies for all available environments. You can check a network policy’s yaml manifest, toggle the policy’s enforcement status, and create and edit deployed policies. This section has the following prerequisites:

Network policies are fetched directly from the selected environment’s deployment platform. Changes performed outside of this tab are reflected upon refresh. Enforcement status changes are deployed directly to a deployment namespace of the selected environment.

By default, the network policy list contains predefined policies in a disabled state. Once enabled,a predefined policy deploys to the selected environment’s deployment platform and you can manage it like the regular policies.

Note that if you’re using Auto DevOps and change a policy in this section, your auto-deploy-values.yaml file doesn’t update. Auto DevOps users must make changes by following the Container Network Policy documentation.

Changing enforcement status

To change a network policy’s enforcement status:

  • Click the network policy you want to update.
  • Click the Enforcement status toggle to update the selected policy.
  • Click the Apply changes button to deploy network policy changes.

Disabled network policies have the network-policy.gitlab.com/disabled_by: gitlab selector inside the podSelector block. This narrows the scope of such a policy and as a result it doesn’t affect any pods. The policy itself is still deployed to the corresponding deployment namespace.

Container Network Policy editor

The policy editor allows you to create, edit, and delete policies. To create a new policy click the New policy button located in the Policy tab’s header. To edit an existing policy, clickEdit policy in the selected policy drawer.

Note that the policy editor only supports the CiliumNetworkPolicyspecification. Regular Kubernetes NetworkPolicy resources aren’t supported.

The policy editor has two modes:

  • The visual Rule mode allows you to construct and preview policy rules using rule blocks and related controls.
  • YAML mode allows you to enter a policy definition in .yaml format and is aimed at expert users and cases that the Rule mode doesn’t support.

You can use both modes interchangeably and switch between them at any time. If a YAML resource is incorrect, Rule mode is automatically disabled. You must use YAML mode to fix your policy before Rule mode is available again.

Rule mode supports the following rule types:

Once your policy is complete, save it by pressing the Save policy button at the bottom of the editor. Existing policies can also be removed from the editor interface by clicking the Delete policy button at the bottom of the editor.