Implementing Github Advanced Security For Code Scanning

Core Concepts

CodeQL Analysis Engine

CodeQL compiles source code into a queryable database, then executes security-focused queries against that database. The query suites ship with hundreds of checks mapped to CWE identifiers and cover OWASP Top 10, SANS Top 25, and language-specific vulnerability patterns. Custom queries can be authored using the CodeQL query language (QL) to detect organization-specific anti-patterns.

Default Setup vs. Advanced Setup

Default Setup enables code scanning with a single click from the repository's Code Security settings. GitHub automatically determines the languages present, selects appropriate query suites, and configures scanning triggers. This approach requires no workflow file and is ideal for rapid onboarding.

Advanced Setup generates a .github/workflows/codeql.yml workflow file that can be customized. Teams control scheduling, language matrices, build commands for compiled languages, additional query packs, and integration with third-party SARIF producers. Advanced setup is required when custom build steps, monorepo configurations, or private query packs are needed.

Organization-Wide Rollout

For enterprises managing hundreds of repositories, GHAS supports configuring code scanning at scale using the organization-level security overview. Administrators can enable default setup across all eligible repositories, define custom security configurations, and monitor adoption through the security coverage dashboard.

Workflow

Step 1 --- Enable GHAS on the Organization

1. Navigate to Organization Settings > Code security and analysis
2. Enable GitHub Advanced Security for all repositories or selected repositories
3. Confirm license seat allocation (GHAS is billed per active committer)

Step 2 --- Configure Default Setup for Quick Wins

1. Go to Repository Settings > Code security > Code scanning
2. Click "Set up" in the CodeQL analysis row and select "Default"
3. Review the auto-detected languages and query suite (default or extended)
4. Click "Enable CodeQL" to activate scanning on push and pull request events

Step 3 --- Advanced Setup with Custom Workflow

Create .github/workflows/codeql-analysis.yml: