SAST Configuration

# SAST Configuration

Static Application Security Testing (SAST) tool setup, configuration, and custom rule creation for comprehensive security scanning across multiple programming languages.

## Overview

This skill provides comprehensive guidance for setting up and configuring SAST tools including Semgrep, SonarQube, and CodeQL. Use this skill when you need to:

- Set up SAST scanning in CI/CD pipelines
- Create custom security rules for your codebase
- Configure quality gates and compliance policies
- Optimize scan performance and reduce false positives
- Integrate multiple SAST tools for defense-in-depth

## Core Capabilities

### 1. Semgrep Configuration

- Custom rule creation with pattern matching
- Language-specific security rules (Python, JavaScript, Go, Java, etc.)
- CI/CD integration (GitHub Actions, GitLab CI, Jenkins)
- False positive tuning and rule optimization
- Organizational policy enforcement

### 2. SonarQube Setup

- Quality gate configuration
- Security hotspot analysis
- Code coverage and technical debt tracking
- Custom quality profiles for languages
- Enterprise integration with LDAP/SAML

### 3. CodeQL Analysis

- GitHub Advanced Security integration
- Custom query development
- Vulnerability variant analysis
- Security research workflows
- SARIF result processing

## Quick Start

### Initial Assessment

1. Identify primary programming languages in your codebase
2. Determine compliance requirements (PCI-DSS, SOC 2, etc.)
3. Choose SAST tool based on language support and integration needs
4. Review baseline scan to understand current security posture

### Basic Setup

```bash
# Semgrep quick start
pip install semgrep
semgrep --config=auto --error

# SonarQube with Docker
docker run -d --name sonarqube -p 9000:9000 sonarqube:10.8-community

# CodeQL CLI setup
gh extension install github/gh-codeql
codeql database create mydb --language=python
```

## Integration Patterns

### CI/CD Pipeline Integration

```yaml
# GitHub Actions example
- name: Run Semgrep
  uses: returntocorp/semgrep-action@v1
  with:
    config: >-
      p/security-audit
      p/owasp-top-ten
```

### Pre-commit Hook

```bash
# .pre-commit-config.yaml
- repo: https://github.com/returntocorp/semgrep
  rev: v1.45.0
  hooks:
    - id: semgrep
      args: ['--config=auto', '--error']
```

## Best Practices

1. **Start with Baseline**
   - Run initial scan to establish security baseline
   - Prioritize critical and high severity findings
   - Create remediation roadmap

2. **Incremental Adoption**
   - Begin with security-focused rules
   - Gradually add code quality rules
   - Implement blocking only for critical issues

3. **False Positive Management**
   - Document legitimate suppressions
   - Create allow lists for known safe patterns
   - Regularly review suppressed findings

4. **Performance Optimization**
   - Exclude test files and generated code
   - Use incremental scanning for large codebases
   - Cache scan results in CI/CD

5. **Team Enablement**
   - Provide security training for developers
   - Create internal documentation for common patterns
   - Establish security champions program

## Common Use Cases

### New Project Setup

```bash
./scripts/run-sast.sh --setup --language python --tools semgrep,sonarqube
```

### Custom Rule Development

```yaml
# See references/semgrep-rules.md for detailed examples
rules:
  - id: hardcoded-jwt-secret
    pattern: jwt.encode($DATA, "...", ...)
    message: JWT secret should not be hardcoded
    severity: ERROR
```

### Compliance Scanning

```bash
# PCI-DSS focused scan
semgrep --config p/pci-dss --json -o pci-scan-results.json
```

## Troubleshooting

### High False Positive Rate

- Review and tune rule sensitivity
- Add path filters to exclude test files
- Use nostmt metadata for noisy patterns
- Create organization-specific rule exceptions

### Performance Issues

- Enable incremental scanning
- Parallelize scans across modules
- Optimize rule patterns for efficiency
- Cache dependencies and scan results

### Integration Failures

- Verify API tokens and credentials
- Check network connectivity and proxy settings
- Review SARIF output format compatibility
- Validate CI/CD runner permissions

## Related Skills

- [OWASP Top 10 Checklist](../owasp-top10-checklist/SKILL.md)
- [Container Security](../container-security/SKILL.md)
- [Dependency Scanning](../dependency-scanning/SKILL.md)

## Tool Comparison

| Tool      | Best For                 | Language Support | Cost            | Integration   |
| --------- | ------------------------ | ---------------- | --------------- | ------------- |
| Semgrep   | Custom rules, fast scans | 30+ languages    | Free/Enterprise | Excellent     |
| SonarQube | Code quality + security  | 25+ languages    | Free/Commercial | Good          |
| CodeQL    | Deep analysis, research  | 10+ languages    | Free (OSS)      | GitHub native |

## Next Steps

1. Complete initial SAST tool setup
2. Run baseline security scan
3. Create custom rules for organization-specific patterns
4. Integrate into CI/CD pipeline
5. Establish security gate policies
6. Train development team on findings and remediation