Privacy Audit Antivirus in 2026: Step-by-Step

import os
import sys
import subprocess
import json
import logging
import argparse
from typing import Dict, List, Optional
from pathlib import Path

# Configure logging to stdout with timestamp and level
logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s - %(levelname)s - %(message)s",
    handlers=[logging.StreamHandler(sys.stdout)]
)
logger = logging.getLogger(__name__)

# Required dependencies with minimum versions for 2026 audit compliance
REQUIRED_DEPS = {
    "yara": "4.3.2",
    "openprivacy-audit": "3.2.1",
    "jq": "1.7",
    "clamav": "1.3.0"
}

def check_system_deps() -> bool:
    """Verify all required system dependencies are installed and meet version requirements."""
    all_met = True
    for dep, min_version in REQUIRED_DEPS.items():
        try:
            # Handle version checking for different tools
            if dep == "yara":
                result = subprocess.run(["yara", "--version"], capture_output=True, text=True)
                installed_version = result.stdout.strip().split("\n")[0]
            elif dep == "openprivacy-audit":
                result = subprocess.run(["openprivacy-audit", "--version"], capture_output=True, text=True)
                installed_version = result.stdout.strip()
            elif dep == "jq":
                result = subprocess.run(["jq", "--version"], capture_output=True, text=True)
                installed_version = result.stdout.strip().replace("jq-", "")
            elif dep == "clamav":
                result = subprocess.run(["clamscan", "--version"], capture_output=True, text=True)
                installed_version = result.stdout.strip().split(" ")[1]
            else:
                continue

            # Simple semantic version comparison (handles X.Y.Z format)
            def parse_version(v: str) -> tuple:
                return tuple(map(int, v.split(".")))

            if parse_version(installed_version) < parse_version(min_version):
                logger.error(f"Dependency {dep} version {installed_version} is below minimum {min_version}")
                all_met = False
            else:
                logger.info(f"Dependency {dep} version {installed_version} meets requirements")
        except FileNotFoundError:
            logger.error(f"Dependency {dep} not found in PATH")
            all_met = False
        except Exception as e:
            logger.error(f"Error checking {dep}: {str(e)}")
            all_met = False
    return all_met

def setup_audit_directories(base_path: Path) -> None:
    """Create required directory structure for audit pipeline."""
    dirs = ["signatures", "scan_results", "reports", "logs"]
    for dir_name in dirs:
        target_dir = base_path / dir_name
        target_dir.mkdir(parents=True, exist_ok=True)
        logger.info(f"Created directory: {target_dir}")

def main():
    parser = argparse.ArgumentParser(description="Set up privacy audit environment for antivirus tools")
    parser.add_argument("--base-path", type=Path, default=Path("./antivirus_audit"), help="Base directory for audit pipeline")
    args = parser.parse_args()

    logger.info(f"Initializing audit environment at {args.base_path}")

    if not check_system_deps():
        logger.error("Dependency check failed. Install missing dependencies before proceeding.")
        sys.exit(1)

    setup_audit_directories(args.base_path)

    # Write initial config file
    config = {
        "audit_version": "2026.1",
        "scan_targets": [],
        "pii_ruleset": "owasp_privacy_2026",
        "report_format": "json"
    }
    config_path = args.base_path / "audit_config.json"
    with open(config_path, "w") as f:
        json.dump(config, f, indent=2)
    logger.info(f"Wrote initial config to {config_path}")

    logger.info("Environment setup complete. Proceed to Step 2: Signature Management.")

if __name__ == "__main__":
    main()

import yara
import json
import logging
import argparse
import hashlib
import requests
import sys
from pathlib import Path
from typing import List, Dict
from datetime import datetime

# Configure logging
logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s - %(levelname)s - %(message)s",
    handlers=[logging.StreamHandler()]
)
logger = logging.getLogger(__name__)

# Official 2026 OpenPrivacy signature repository (canonical GitHub link per rules)
SIGNATURE_REPO_URL = "https://github.com/openprivacy/audit-signatures/raw/main/2026/antivirus"
SIGNATURE_DIR = Path("./antivirus_audit/signatures")

def download_signature(sig_name: str, target_dir: Path) -> Path:
    """Download a single YARA signature from the official repository."""
    url = f"{SIGNATURE_REPO_URL}/{sig_name}.yar"
    target_path = target_dir / f"{sig_name}.yar"

    try:
        logger.info(f"Downloading signature {sig_name} from {url}")
        response = requests.get(url, timeout=10)
        response.raise_for_status()

        # Verify checksum if available
        checksum_url = f"{url}.sha256"
        checksum_response = requests.get(checksum_url, timeout=10)
        checksum_response.raise_for_status()
        expected_checksum = checksum_response.text.strip()

        # Calculate actual checksum
        file_hash = hashlib.sha256(response.content).hexdigest()
        if file_hash != expected_checksum:
            logger.error(f"Checksum mismatch for {sig_name}: expected {expected_checksum}, got {file_hash}")
            raise ValueError("Signature checksum validation failed")

        # Write signature to disk
        with open(target_path, "wb") as f:
            f.write(response.content)
        logger.info(f"Downloaded signature to {target_path}")
        return target_path
    except requests.exceptions.RequestException as e:
        logger.error(f"Network error downloading {sig_name}: {str(e)}")
        raise
    except Exception as e:
        logger.error(f"Error downloading {sig_name}: {str(e)}")
        raise

def compile_signatures(signature_dir: Path) -> yara.Rules:
    """Compile all YARA signatures in the directory into a single ruleset."""
    signature_files = list(signature_dir.glob("*.yar"))
    if not signature_files:
        logger.error("No YARA signature files found in {signature_dir}")
        raise FileNotFoundError("No signatures to compile")

    rules = yara.compile(filepaths={f.stem: str(f) for f in signature_files})
    logger.info(f"Compiled {len(signature_files)} signatures into ruleset")
    return rules

def list_signatures(signature_dir: Path) -> List[Dict]:
    """List all installed signatures with metadata."""
    signatures = []
    for sig_file in signature_dir.glob("*.yar"):
        with open(sig_file, "r") as f:
            content = f.read()
        signatures.append({
            "name": sig_file.stem,
            "path": str(sig_file),
            "size_bytes": sig_file.stat().st_size,
            "last_modified": datetime.fromtimestamp(sig_file.stat().st_mtime).isoformat()
        })
    return signatures

def main():
    parser = argparse.ArgumentParser(description="Manage privacy audit signatures for antivirus tools")
    parser.add_argument("--action", choices=["download", "compile", "list"], required=True, help="Action to perform")
    parser.add_argument("--sig-name", help="Specific signature name to download (required for download action)")
    parser.add_argument("--sig-dir", type=Path, default=SIGNATURE_DIR, help="Signature directory path")
    args = parser.parse_args()

    args.sig_dir.mkdir(parents=True, exist_ok=True)

    if args.action == "download":
        if not args.sig_name:
            logger.error("Must specify --sig-name for download action")
            sys.exit(1)
        download_signature(args.sig_name, args.sig_dir)
    elif args.action == "compile":
        try:
            rules = compile_signatures(args.sig_dir)
            # Save compiled rules for later use
            rules.save(str(args.sig_dir / "compiled_rules.yarc"))
            logger.info("Compiled rules saved to {args.sig_dir / 'compiled_rules.yarc'}")
        except Exception as e:
            logger.error(f"Compilation failed: {str(e)}")
            sys.exit(1)
    elif args.action == "list":
        sigs = list_signatures(args.sig_dir)
        print(json.dumps(sigs, indent=2))

if __name__ == "__main__":
    main()

import yara
import json
import logging
import argparse
import subprocess
import time
import sys
import hashlib
import os
from pathlib import Path
from typing import List, Dict, Optional
from datetime import datetime

# Configure logging
logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s - %(levelname)s - %(message)s",
    handlers=[logging.StreamHandler()]
)
logger = logging.getLogger(__name__)

# Paths from previous steps
SIGNATURE_DIR = Path("./antivirus_audit/signatures")
RESULT_DIR = Path("./antivirus_audit/scan_results")
REPORT_DIR = Path("./antivirus_audit/reports")

def load_compiled_rules() -> yara.Rules:
    """Load pre-compiled YARA rules from disk."""
    rules_path = SIGNATURE_DIR / "compiled_rules.yarc"
    if not rules_path.exists():
        logger.error(f"Compiled rules not found at {rules_path}. Run manage_signatures.py --action compile first.")
        sys.exit(1)
    try:
        rules = yara.load(str(rules_path))
        logger.info(f"Loaded compiled rules from {rules_path}")
        return rules
    except yara.Error as e:
        logger.error(f"Failed to load YARA rules: {str(e)}")
        raise

def scan_file(file_path: Path, rules: yara.Rules) -> List[Dict]:
    """Scan a single file for privacy violations using YARA rules."""
    matches = []
    try:
        # YARA match returns list of Match objects
        yara_matches = rules.match(str(file_path), timeout=30)
        for match in yara_matches:
            matches.append({
                "rule": match.rule,
                "tags": match.tags,
                "meta": match.meta,
                "file_path": str(file_path),
                "scan_time": datetime.now().isoformat()
            })
        logger.info(f"Scanned {file_path}: {len(matches)} matches found")
    except yara.TimeoutError:
        logger.warning(f"Scan timeout for {file_path}")
    except Exception as e:
        logger.error(f"Error scanning {file_path}: {str(e)}")
    return matches

def scan_directory(target_dir: Path, rules: yara.Rules, recursive: bool = True) -> List[Dict]:
    """Scan all files in a directory, optionally recursively."""
    all_matches = []
    if recursive:
        files = list(target_dir.rglob("*"))
    else:
        files = list(target_dir.glob("*"))

    # Filter out directories
    files = [f for f in files if f.is_file()]
    logger.info(f"Scanning {len(files)} files in {target_dir}")

    for file_path in files:
        # Skip non-readable files
        if not os.access(file_path, os.R_OK):
            logger.warning(f"Skipping unreadable file {file_path}")
            continue
        matches = scan_file(file_path, rules)
        all_matches.extend(matches)
    return all_matches

def generate_report(matches: List[Dict], target: str) -> Path:
    """Generate a JSON report from scan matches."""
    REPORT_DIR.mkdir(parents=True, exist_ok=True)
    report = {
        "report_id": hashlib.md5(target.encode()).hexdigest()[:8],
        "target": target,
        "scan_time": datetime.now().isoformat(),
        "total_matches": len(matches),
        "matches": matches,
        "audit_version": "2026.1"
    }
    report_path = REPORT_DIR / f"audit_report_{datetime.now().strftime('%Y%m%d_%H%M%S')}.json"
    with open(report_path, "w") as f:
        json.dump(report, f, indent=2)
    logger.info(f"Report generated at {report_path}")
    return report_path

def main():
    parser = argparse.ArgumentParser(description="Run privacy audit scan on antivirus installation")
    parser.add_argument("--target", type=Path, required=True, help="Path to antivirus installation or directory to scan")
    parser.add_argument("--recursive", action="store_true", help="Recursively scan target directory")
    args = parser.parse_args()

    if not args.target.exists():
        logger.error(f"Target path {args.target} does not exist")
        sys.exit(1)

    # Load rules
    rules = load_compiled_rules()

    # Run scan
    start_time = time.time()
    if args.target.is_file():
        matches = scan_file(args.target, rules)
    else:
        matches = scan_directory(args.target, rules, args.recursive)
    scan_duration = time.time() - start_time

    logger.info(f"Scan completed in {scan_duration:.2f} seconds. Total matches: {len(matches)}")

    # Generate report
    if matches:
        report_path = generate_report(matches, str(args.target))
        print(f"Report saved to: {report_path}")
    else:
        print("No privacy violations detected.")

if __name__ == "__main__":
    main()

# Sort YARA rules by stem name before compilation to ensure deterministic ordering
def compile_signatures_deterministic(signature_dir: Path) -> yara.Rules:
    signature_files = sorted(signature_dir.glob("*.yar"), key=lambda x: x.stem)
    rules = yara.compile(filepaths={f.stem: str(f) for f in signature_files})
    return rules

# GitHub Actions workflow for privacy audit
name: Privacy Audit
on:
  push:
    branches: [ main ]
  pull_request:
    branches: [ main ]
jobs:
  audit:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: '3.12'
      - name: Install dependencies
        run: pip install yara requests
      - name: Run audit scan
        run: python run_audit_scan.py --target ./antivirus_core --recursive
      - name: Upload report
        uses: actions/upload-artifact@v4
        with:
          name: audit-report
          path: ./antivirus_audit/reports/

# Minimal filesystem cache for YARA signatures
import time
from pathlib import Path
from typing import Optional

def get_cached_signature(sig_name: str, cache_dir: Path, ttl: int = 86400) -> Optional[Path]:
    cache_path = cache_dir / f"{sig_name}.yar"
    if cache_path.exists():
        if time.time() - cache_path.stat().st_mtime < ttl:
            return cache_path
    return None

antivirus-privacy-audit-2026/
├── setup_audit_env.py          # Step 1: Environment setup script
├── manage_signatures.py        # Step 2: Signature management script
├── run_audit_scan.py           # Step 3: Audit scan execution script
├── antivirus_audit/            # Auto-generated base directory
│   ├── signatures/             # YARA signature storage
│   │   ├── compiled_rules.yarc # Pre-compiled YARA rules
│   │   └── *.yar               # Individual YARA signature files
│   ├── scan_results/           # Raw scan match data
│   ├── reports/                # Generated audit reports
│   └── logs/                   # Audit pipeline logs
├── .github/
│   └── workflows/
│       └── privacy-audit.yml  # GitHub Actions CI/CD workflow
├── requirements.txt            # Python dependencies
└── README.md                   # Project documentation