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SECURITY_MEASURES.md

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🔒 Security Measures for Confidential Document Processing

Critical Security Rules

1. NEVER Save Extracted Content to Disk

  • ❌ PROHIBITED: fs::write() of extracted images, text, or any document content
  • ❌ PROHIBITED: Debug files with document data
  • ✅ ALLOWED: Statistics and metadata only

2. Memory-Only Processing

  • All confidential content MUST remain in memory only
  • Use temporary files ONLY for system tools (like Tesseract)
  • Clean up temporary files immediately after use

3. No Content Logging

  • ❌ PROHIBITED: println!() or logging of document text content
  • ❌ PROHIBITED: Debug output with extracted images
  • ✅ ALLOWED: Processing statistics, page counts, confidence scores

4. Secure Temporary Files

  • Use system temporary directories only
  • Clean up ALL temporary files
  • Never save temp files in project directory

Code Review Checklist

Before any OCR processing code:

  • No fs::write() calls with document content
  • No debug image saving
  • No content logging
  • Proper temp file cleanup
  • Memory-only processing

Security Violation Examples

❌ VIOLATIONS (NEVER DO THIS):

// SECURITY VIOLATION - Saves extracted image
let debug_path = format!("extracted_{}x{}.jpg", width, height);
fs::write(&debug_path, &image_data)?;

// SECURITY VIOLATION - Logs document content
println!("Extracted text: {}", ocr_result.text);

// SECURITY VIOLATION - Saves document data
fs::write("debug_output.txt", &extracted_text)?;

✅ SECURE ALTERNATIVES:

// SECURE - Statistics only
println!("Processed {} characters with {:.1}% confidence",
         ocr_result.text.len(), ocr_result.confidence * 100.0);

// SECURE - Memory processing only
let processed_data = process_in_memory(&image_data)?;

// SECURE - Proper temp file handling
let temp_file = NamedTempFile::new()?;
// ... use temp file ...
// temp_file is automatically cleaned up

Emergency Response

If confidential data is accidentally saved:

  1. IMMEDIATE: Delete all files with rm -f
  2. VERIFY: Use find to ensure no stray files
  3. FIX CODE: Remove the security violation
  4. RECOMPILE: Ensure no warnings
  5. DOCUMENT: Update this security guide

Enforcement

  • All code MUST pass security review
  • No exceptions for "debugging" or "testing"
  • Security failures are critical bugs
  • All team members responsible for enforcement