implementing-semgrep-for-custom-sast-rules

# Implementing Semgrep for Custom SAST Rules ## Overview Semgrep is an open-source static analysis tool that uses pattern-matching to find bugs, enforce code standards, and detect security vulnerabilities. Custom rules are written in YAML using Semgrep's pattern syntax, making it accessible without requiring compiler knowledge. It supports 30+ languages including Python, JavaScript, Go, Java, and C. ## When to Use - When deploying or configuring implementing semgrep for custom sast rules capabilities in your environment - When establishing security controls aligned to compliance requirements - When building or improving security architecture for this domain - When conducting security assessments that require this implementation ## Prerequisites - Python 3.8+ or Docker - Semgrep CLI installed - Target codebase in a supported language ## Installation ```bash # Install via pip pip install semgrep # Install via Homebrew brew install semgrep # Run via Docker docker run -v "${PWD}:/src" returntocorp/semgrep semgrep --config auto /src # Verify semgrep --version ``` ## Running Semgrep ```bash # Auto-detect rules for your code semgrep --config auto . # Use Semgrep registry rules semgrep --config r/python.lang.security # Use custom rule file semgrep --config my-rules.yaml . # Use multiple configs semgrep --config auto --config ./custom-rules/ . # JSON output semgrep --config auto --json . > results.json # SARIF output for GitHub semgrep --config auto --sarif . > resu...