[QA] ✅ VERIFIED - All security fixes validated, 252/252 tests pass. Implementation approved for production. See /tmp/qa-CDEV-9.md for full report.

## Security Fixes Applied ### Vulnerabilities Addressed 1. **Command Injection in install_tailscale() (Lines 343-355)** - Added `validate_tailscale_authkey()` to validate authkey format (must start with 'tskey-') - Added `validate_hostname()` to validate hostname format - Applied `shlex.quote()` for safe shell escaping 2. **Command Injection in configure_user() (Lines 466-552)** - Added `validate_username()` - must be 1-32 chars, start with letter, alphanumeric/underscore/hyphen only - Added `validate_password()` - rejects shell metacharacters (;'"`$\) - Replaced direct echo of passwords with temp file approach for chpasswd/vncpasswd - Applied `shlex.quote()` for all user-controlled values 3. **Command Injection in start_vnc_server() (Lines 652-669)** - Added `validate_geometry()` - must match WIDTHxHEIGHT format (e.g., 1280x800) - Added validation for display (0-99) and depth (8/16/24/32) - Applied `shlex.quote()` for username and geometry 4. **Heredoc Escape in SSH Key Handling (Lines 537-548)** - Added `validate_ssh_key()` - validates key type prefix and rejects 'EOF' markers - Changed heredoc approach to base64 encoding for safe key transfer - Validates all SSH keys before writing to authorized_keys 5. **Command Injection in disable_screensaver() (Lines 573-625)** - Added username validation with `shlex.quote()` ### New Validation Functions Added (Lines 38-172) - `ValidationError` exception class - `validate_username()` - lowercase alphanumeric, underscore, hyphen; 1-32 chars - `validate_password()` - rejects shell metacharacters, 1-128 chars - `validate_geometry()` - WIDTHxHEIGHT format validation - `validate_hostname()` - RFC-compliant hostname validation - `validate_ssh_key()` - validates key type prefix and prevents heredoc escapes - `validate_tailscale_authkey()` - validates tskey- format ### Security Tests Added (Lines 728-1096) - 37 new security tests covering: - Input validation for all validators - Command injection prevention for all vulnerable functions - Heredoc escape prevention ### Test Results - All 252 tests pass (70 container_manager tests, 37 new security tests) - 16 integration tests skipped (require Incus environment)

[QA] CRITICAL SECURITY VULNERABILITIES - Implementation Rejected ## QA Summary **Status:** ❌ FAILED **Date:** 2025-12-24 **Agent:** code-verification-qa While the implementation has excellent code structure and comprehensive test coverage (215 tests passing), **CRITICAL COMMAND INJECTION VULNERABILITIES** were discovered that make this code unsafe for production use. ## Critical Issues Found ### 🚨 Vulnerability #1: Command Injection in `install_tailscale()` (Line 185) ```python script = f"tailscale up --authkey='{authkey}' --hostname='{ts_hostname}'" ``` **Impact:** Arbitrary command execution via malicious authkey/hostname ### 🚨 Vulnerability #2: Command Injection in `configure_user()` (Lines 297-331) ```python echo '{username}:{user_password}' | chpasswd echo '{vnc_password}' | vncpasswd -f > /home/{username}/.vnc/passwd ``` **Impact:** Arbitrary command execution via malicious username/passwords ### 🚨 Vulnerability #3: Command Injection in `start_vnc_server()` (Line 441) ```python script = f"su - {username} -c 'vncserver :{display} -geometry {geometry} -depth {depth} -localhost no'" ``` **Impact:** Command injection via geometry parameter ### ⚠️ Vulnerability #4: Potential Heredoc Escape in SSH Key Handling (Lines 339-345) **Impact:** Possible command injection via EOF marker injection ## Required Fixes 1. **Add input validation** for all user-controlled parameters (username, passwords, geometry, etc.) 2. **Use shlex.quote()** for shell escaping or pass commands as arrays 3. **Validate SSH key format** with regex before writing to files 4. **Add security tests** to verify injection attempts are blocked ## What Works Well ✅ Code structure and organization ✅ Test coverage (32 unit tests) ✅ All 215 tests pass ✅ Job processor integration ✅ Progress tracking callbacks ✅ Comprehensive docstrings ✅ Proper async/await usage ## Full Report See `/tmp/qa-CDEV-9.md` for complete security analysis and detailed fix recommendations. ## Recommendation **DO NOT MERGE** until all command injection vulnerabilities are fixed and security tests are added.

## Implementation Summary Ported create-xubuntu.sh to Python in container_manager.py. ### Files Created - **app/services/container_manager.py**: New module with create_desktop_container() function ### Key Components 1. **DesktopContainerConfig** - Configuration dataclass for desktop container creation - Supports VNC/user passwords, Tailscale auth, SSH keys 2. **create_desktop_container()** - Main entry point (app/services/container_manager.py:475) - Creates Incus container with 'desktop' profile - Waits for system ready state - Orchestrates all installation steps 3. **Installation Functions**: - install_desktop_packages() - Xubuntu, VNC, SSH, curl - install_tailscale() - With optional auth key - install_nodejs() - Node.js 22 - install_chrome() - Chrome with Claude extension policy - install_claude_code() - @anthropic-ai/claude-code 4. **Configuration Functions**: - configure_user() - User creation, VNC password, SSH setup - disable_screensaver() - XFCE power/screensaver settings - start_vnc_server() - VNC on display :1 (port 5901) ### Integration - Updated job_processor.py to use container_manager for 'desktop' image type - Added detailed progress stages for desktop container creation - Maintains backward compatibility for headless/cuda image types ### Tests - 33 unit tests in tests/test_container_manager.py - All 215 tests pass (16 skipped integration tests)