It's possible to run most of the GitLab security scanners when not connected to the internet.
This document describes how to operate Secure Categories (that is, scanner types) in an offline environment. These instructions also apply to self-managed installations that are secured, have security policies (for example, firewall policies), or are otherwise restricted from accessing the full internet. GitLab refers to these environments as offline environments. Other common names include:
- Air-gapped environments
- Limited connectivity environments
- Local area network (LAN) environments
- Intranet environments
These environments have physical barriers or security policies (for example, firewalls) that prevent or limit internet access. These instructions are designed for physically disconnected networks, but can also be followed in these other use cases.
Defining offline environments
In an offline environment, the GitLab instance can be one or more servers and services that can communicate on a local network, but with no or very restricted access to the internet. Assume anything within the GitLab instance and supporting infrastructure (for example, a private Maven repository) can be accessed through a local network connection. Assume any files from the internet must come in through physical media (USB drive, hard drive, writeable DVD, etc.).
GitLab scanners generally will connect to the internet to download the latest sets of signatures, rules, and patches. A few extra steps are necessary to configure the tools to function properly by using resources available on your local network.
Container registries and package repositories
At a high-level, the security analyzers are delivered as Docker images and may leverage various package repositories. When you run a job on an internet-connected GitLab installation, GitLab checks the GitLab.com-hosted container registry to check that you have the latest versions of these Docker images and possibly connect to package repositories to install necessary dependencies.
In an offline environment, these checks must be disabled so that GitLab.com isn't queried. Because the GitLab.com registry and repositories are not available, you must update each of the scanners to either reference a different, internally-hosted registry or provide access to the individual scanner images.
You must also ensure that your app has access to common package repositories that are not hosted on GitLab.com, such as npm, yarn, or rubygems. Packages from these repos can be obtained by temporarily connecting to a network or by mirroring the packages inside your own offline network.
Interacting with the vulnerabilities
Once a vulnerability is found, you can interact with it. Read more on how to interact with the vulnerabilities.
Please note that in some cases the reported vulnerabilities provide metadata that can contain external links exposed in the UI. These links might not be accessible within an offline environment.
Scanner signature and rule updates
When connected to the internet, some scanners will reference public databases for the latest sets of signatures and rules to check against. Without connectivity, this is not possible. Depending on the scanner, you must therefore disable these automatic update checks and either use the databases that they came with and manually update those databases or provide access to your own copies hosted within your network.
Specific scanner instructions
Each individual scanner may be slightly different than the steps described above. You can find more information at each of the pages below: