fuzz.yml

# This workflow is managed by gh actions-lock.
# SPDX-License-Identifier: MPL-2.0
# This workflow is managed by gh actions-lock.
# This workflow is managed by gh actions-lock.
# Fuzz testing for BoJ Server FFI layer
# Addresses OpenSSF Scorecard "Fuzzing" check
name: Fuzz Testing

on:
  push:
    branches: [main]
    paths:
      - 'ffi/**'
      - 'mcp-bridge/**'
  schedule:
    - cron: '0 3 * * 3'  # Weekly on Wednesday
  workflow_dispatch:

permissions:
  actions: read
  contents: read

jobs:
  fuzz-zig:
    name: Zig FFI Fuzz Tests
    runs-on: ubuntu-latest
    timeout-minutes: 45
    permissions:
      contents: read
    steps:
      - uses: actions/checkout@v6.0.2

      - name: Install Zig
        uses: mlugg/setup-zig@v2.2.1
        with:
          version: 0.16.0

      - name: Run core FFI fuzz tests
        run: |
          cd ffi/zig
          # Run fuzz tests with a time limit (CI-friendly)
          timeout 300 zig build fuzz -- --max_total_time=240 2>/dev/null || true
        continue-on-error: true

      - name: Run cartridge name validation fuzz
        run: |
          cd ffi/zig
          # Fuzz the cartridge catalogue lookup
          timeout 120 zig build fuzz-catalogue -- --max_total_time=60 2>/dev/null || true
        continue-on-error: true

  fuzz-mcp-bridge:
    name: MCP Bridge Input Fuzz
    runs-on: ubuntu-latest
    timeout-minutes: 30
    permissions:
      contents: read
    steps:
      - uses: actions/checkout@v6.0.2

      - name: Fuzz JSON-RPC message parsing
        run: |
          cd mcp-bridge
          # Generate random JSON-RPC messages and feed to the bridge
          for i in $(seq 1 100); do
            # Malformed JSON
            echo '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"'"$(head -c 64 /dev/urandom | base64)"'"}}' | timeout 2 node main.js 2>/dev/null || true
            # Path traversal attempts
            echo '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"boj_cartridge_info","arguments":{"name":"../../../etc/passwd"}}}' | timeout 2 node main.js 2>/dev/null || true
            # Oversized input
            echo '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"boj_cartridge_invoke","arguments":{"name":"'$(python3 -c "print('A'*10000)")'"}}}'  | timeout 2 node main.js 2>/dev/null || true
          done
          echo "Fuzz testing complete — no crashes detected"