security analysis via pipelines

suggestions.md

Based on my analysis of the cli.py file, here are the specific security issues and fixes:

Security Issues and Fixes for cli.py:43-44, cli.py:93-94

1. Path Traversal Vulnerability (High Risk)

• Lines: 43-44, 93-94
• Issue: Direct file path usage without validation allows path traversal attacks
• Fix: Add path validation and use pathlib.Path.resolve() to prevent directory traversal

2. Resource Exhaustion (Medium Risk)

• Lines: 41, 44, 94
• Issue: No file size limits on sys.stdin.read() and file reading
• Fix: Add maximum file size limits to prevent memory exhaustion

3. Input Validation Missing (Medium Risk)

• Lines: 177, 234, 250-252
• Issue: User input not properly validated before use
• Fix: Add strict input validation with allowed values

4. Private Method Access (Low Risk)

• Line: 192
• Issue: Direct access to private method _process_character()
• Fix: Use public API methods instead

Specific Code Fixes:

For file operations (lines 43-44, 93-94):

# Replace with:
from pathlib import Path
MAX_FILE_SIZE = 10 * 1024 * 1024  # 10MB limit

def safe_read_file(file_path: str) -> str:
    try:
        path = Path(file_path).resolve()
        if not path.exists() or not path.is_file():
            raise ValueError(f"Invalid file path: {file_path}")
        if path.stat().st_size > MAX_FILE_SIZE:
            raise ValueError(f"File too large: {path.stat().st_size} bytes")
        return path.read_text(encoding='utf-8')
    except OSError as e:
        raise ValueError(f"Cannot read file {file_path}: {e}")

For stdin reading (line 41):

# Replace with:
content = sys.stdin.read(MAX_FILE_SIZE)

For input validation (lines 177, 234):

# Add validation:
ALLOWED_TEST_DATA = {"sample", "edge-cases", "malformed"}
ALLOWED_COMPLEXITY = {"simple", "medium", "complex"}

if test_data not in ALLOWED_TEST_DATA:
    # existing error handling

if complexity not in ALLOWED_COMPLEXITY:
    console.print(f"[red]Error: Invalid complexity '{complexity}'[/red]")
    raise typer.Exit(1)

These fixes address path traversal, resource exhaustion, input validation, and API misuse vulnerabilities.