prism-sast-scanner 0.1.3

PRISM — Multi-engine security scanner for GitHub Actions and CI/CD pipelines

PRISM Security Scanner

PRISM is a privacy-first, multi-engine security scanner built for GitHub Actions and CI/CD pipelines. It detects secrets, vulnerable dependencies, insecure code patterns, and taint-flow vulnerabilities — all without sending your source code to any third-party server.

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Why PRISM?

Feature	Snyk	Trivy	SonarQube	PRISM
Secrets detection	✓	✓	—	✓
SCA (dependency audit)	✓	✓	✓	✓
AST / SAST rules	—	—	✓	✓
Taint-flow tracking	—	—	✓	✓
AI fix suggestions (BYOK)	—	—	—	✓
Single .docx + HTML report	—	—	—	✓
Source code stays on runner	—	—	—	✓
Free, self-hosted	—	✓	—	✓

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Engines

Engine	What it finds
Secrets Scanner	Hardcoded API keys, tokens, passwords — 20+ patterns with Shannon entropy validation
SCA Scanner	Known CVEs in Python (pip-audit), JavaScript (npm audit), Ruby (bundler-audit), Go (govulncheck)
AST Scanner	OWASP Top 10 patterns for Python, JavaScript, and Java via tree-sitter — 44 rules
Taint Tracker	Source-to-sink taint flows: Flask/Express/Spring inputs reaching SQL, OS commands, eval, or XSS sinks

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How it works — PR Gate

This is the primary use-case: PRISM blocks a merge to main if security findings are found.

Developer opens PR
       │
       ▼
GitHub spins up a fresh Ubuntu VM (runner)
       │
       ▼
actions/checkout — clones the PR branch onto the VM
       │
       ▼
PRISM is pulled from PyPI and installed (pip install prism-scanner)
       │
       ▼
PRISM scans the code on the VM — nothing leaves the VM
       │
       ├─ Findings found above threshold?
       │         │
       │         ▼
       │   Posts summary comment on the PR  ◄── developers see it instantly
       │   Uploads HTML/DOCX report as artifact
       │   Fails the job → merge is BLOCKED
       │
       └─ Clean scan?
                 │
                 ▼
           Posts ✅ comment on PR
           Merge is ALLOWED

The VM is destroyed after the run. Your source code never leaves it.

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Quick Start — GitHub Actions

Add this file to your repository at .github/workflows/prism.yml:

name: PRISM Security Scan

on:
  pull_request:              # runs on every PR — blocks merge if findings found
  push:
    branches: [main]         # also runs after merge as a safety net

jobs:
  prism:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write   # needed so PRISM can post a comment on the PR

    steps:
      - uses: actions/checkout@v4

      - uses: prism-security/prism-action@v1
        with:
          fail-on-severity: HIGH        # CRITICAL | HIGH | MEDIUM | LOW
          report-format: both           # docx | html | both
          github-token: ${{ secrets.GITHUB_TOKEN }}   # enables PR comments

secrets.GITHUB_TOKEN is automatically provided by GitHub — you do not need to create it. PRISM uses it only to post a comment on the PR.

PRISM will:

1. Scan the PR branch on the runner VM
2. Post a findings summary table as a comment on the PR
3. Upload the full HTML + DOCX report as a downloadable artifact
4. Block the merge if findings at or above fail-on-severity are found

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Quick Start — CLI (local / any CI)

pip install prism-scanner

# Scan any project directory
prism scan --target ./my-project --report-format both --fail-on-severity HIGH

The report is saved to prism-output/<project>_prism_security_report_<timestamp>.html (and .docx).

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AI-Powered Tier (Premium — BYOK)

PRISM optionally integrates with your own Azure OpenAI deployment to:

• Filter false positives automatically
• Provide AI-generated fix descriptions
• Generate a complete corrected code block ready to paste
• Re-score risk based on context

Your source code is never sent to AI — only the finding metadata (file, line, rule, 500-char snippet) is sent, and only to the endpoint you own.

GitHub Actions

      - uses: prism-security/prism-action@v1
        with:
          fail-on-severity: HIGH
          report-format: both
          azure-openai-key: ${{ secrets.PRISM_AZURE_OPENAI_KEY }}
          azure-openai-endpoint: ${{ secrets.PRISM_AZURE_OPENAI_ENDPOINT }}
          azure-openai-deployment: gpt-4o   # your deployment name

Store your Azure credentials in Settings → Secrets and variables → Actions in your repository. They are passed only as environment variables to the runner — never logged or transmitted elsewhere.

CLI (local)

# Windows PowerShell
$env:PRISM_AZURE_OPENAI_KEY      = "your-key"
$env:PRISM_AZURE_OPENAI_ENDPOINT = "https://your-resource.openai.azure.com/"
$env:PRISM_AZURE_OPENAI_DEPLOYMENT = "gpt-4o"

prism scan --target ./my-project --report-format both

# Linux / macOS
export PRISM_AZURE_OPENAI_KEY="your-key"
export PRISM_AZURE_OPENAI_ENDPOINT="https://your-resource.openai.azure.com/"
export PRISM_AZURE_OPENAI_DEPLOYMENT="gpt-4o"

prism scan --target ./my-project --report-format both

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All Inputs

Input	Default	Description
target	.	Path to the directory to scan (relative to repo root)
fail-on-severity	HIGH	Fail if findings at or above this level: LOW MEDIUM HIGH CRITICAL
report-format	both	Report output format: docx html both
github-token	(empty)	Pass secrets.GITHUB_TOKEN to enable PR comment summaries
azure-openai-key	(empty)	Azure OpenAI key — enables Premium AI features
azure-openai-endpoint	(empty)	Azure OpenAI endpoint URL
azure-openai-deployment	gpt-4o	Azure OpenAI deployment name
custom-rules	(empty)	Path to a custom YAML rules file
enable-container-scan	false	Enable Trivy container/IaC scanning (requires Trivy on runner)
dry-run-ai	false	Print AI prompt to console without sending — for auditing

Outputs

Output	Description
findings-count	Total number of findings
critical-count	Number of CRITICAL findings
high-count	Number of HIGH findings
report-path	Path to the generated report file(s)

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CI/CD Integration Examples

GitLab CI

prism-scan:
  image: python:3.12-slim
  stage: test
  script:
    - pip install prism-scanner
    - prism scan --target . --report-format html --fail-on-severity HIGH
  artifacts:
    when: always
    paths:
      - prism-output/

Azure DevOps

- task: UsePythonVersion@0
  inputs:
    versionSpec: "3.12"

- script: pip install prism-scanner
  displayName: Install PRISM

- script: prism scan --target . --report-format both --fail-on-severity HIGH
  displayName: Run PRISM Security Scan
  env:
    PRISM_AZURE_OPENAI_KEY: $(PRISM_AZURE_OPENAI_KEY)
    PRISM_AZURE_OPENAI_ENDPOINT: $(PRISM_AZURE_OPENAI_ENDPOINT)

- task: PublishBuildArtifacts@1
  condition: always()
  inputs:
    PathtoPublish: prism-output
    ArtifactName: prism-security-report

Jenkins

stage('PRISM Security Scan') {
    steps {
        sh 'pip install prism-scanner'
        sh 'prism scan --target . --report-format html --fail-on-severity HIGH'
    }
    post {
        always {
            archiveArtifacts artifacts: 'prism-output/**', allowEmptyArchive: true
        }
    }
}

Bitbucket Pipelines

- step:
    name: PRISM Security Scan
    image: python:3.12-slim
    script:
      - pip install prism-scanner
      - prism scan --target . --report-format html --fail-on-severity HIGH
    artifacts:
      - prism-output/**

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Custom Rules

Write your own detection rules in YAML and pass them via --custom-rules:

# my-rules.yml
rules:
  - id: no-eval
    severity: HIGH
    message: "Avoid eval() — execute arbitrary code vulnerability"
    pattern: "eval\\s*\\("
    cwe: CWE-95
    owasp: A03:2021
    languages: [python, javascript]

prism scan --target ./my-project --custom-rules ./my-rules.yml

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Privacy & Security

• Source code never leaves your runner. All engines execute locally.
• AI tier (optional): Only finding metadata is sent — file path, line number, rule ID, and a 500-character code snippet. No full files, no tokens, no credentials.
• BYOK: You use your own Azure OpenAI subscription. PRISM has no backend.
• Audit mode: Run with --dry-run-ai true to print exactly what would be sent to AI before enabling it.

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Supported Languages

Language	Secrets	SCA	AST / OWASP	Taint
Python	✓	✓	✓	✓
JavaScript / TypeScript	✓	✓	✓	✓
Java	✓	—	✓	✓
Ruby	✓	✓	—	—
Go	✓	✓	—	—

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License

MIT — free to use, modify, and distribute. See LICENSE.

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Generated by PRISM Security Scanner — all scan data processed locally on your runner.