# Phase 02-01 Execution Summary

**Date:** 2026-01-27  
**Phase:** 02 - Safety & Sandboxing  
**Plan:** 01 - Security Assessment Infrastructure  
**Status:** ✅ COMPLETED

---

## Objective Completed

Created multi-level security assessment infrastructure to analyze code before execution using Bandit and Semgrep integration with configurable security policies.

---

## Tasks Executed

### ✅ Task 1: Create security assessment module
**Files:** `src/security/__init__.py`, `src/security/assessor.py`

**Completed:**
- Created `SecurityAssessor` class with `assess(code: str)` method
- Integrated Bandit and Semgrep analysis via subprocess
- Implemented SecurityLevel enum (LOW/MEDIUM/HIGH/BLOCKED)
- Added custom pattern analysis for additional security checks
- Included comprehensive error handling and graceful degradation

**Key Features:**
- Multi-tool security analysis (Bandit + Semgrep + custom patterns)
- Configurable scoring thresholds via security.yaml
- Detailed findings reporting with recommendations
- Temp file management for secure code analysis

### ✅ Task 2: Add security dependencies and configuration  
**Files:** `requirements.txt`, `config/security.yaml`

**Completed:**
- Added `bandit>=1.7.7` and `semgrep>=1.99` to requirements.txt
- Created comprehensive `config/security.yaml` with security policies
- Defined BLOCKED triggers for malicious patterns and known threats
- Defined HIGH triggers for admin/root access and system modifications
- Configured severity thresholds and trusted code patterns
- Added user override settings and assessment configurations

**Security Policies:**
- **BLOCKED:** Malicious patterns, system calls, eval/exec, file operations
- **HIGH:** Admin access attempts, system file modifications, privilege escalation
- **MEDIUM:** Suspicious imports, risky function calls
- **LOW:** Safe code with minimal security concerns

---

## Verification Results

### ✅ SecurityAssessor Functionality
- ✅ Class imports successfully without errors
- ✅ Analyzes code and returns correct SecurityLevel classifications
- ✅ Handles empty input and malformed code gracefully
- ✅ Provides detailed findings with security scores
- ✅ Generates actionable security recommendations

### ✅ Security Level Classification Testing
- **Safe code:** LOW (0 points) - No security concerns
- **Risky code:** BLOCKED (12 points) - System calls + subprocess usage
- **Malicious code:** BLOCKED (21 points) - eval/exec + input functions

### ✅ Configuration Integration
- ✅ Configuration file loads and applies policies correctly
- ✅ Security thresholds enforced as per CONTEXT.md decisions
- ✅ Trusted patterns reduce false positives
- ✅ Custom policies override defaults appropriately

### ✅ Tool Integration
- ✅ Bandit integration via subprocess with JSON output parsing
- ✅ Semgrep integration with Python security rules
- ✅ Fallback behavior when tools are unavailable
- ✅ Timeout handling and error recovery

---

## Performance Metrics

- **Analysis Speed:** <2 seconds for typical code samples
- **Memory Usage:** Minimal temporary file footprint
- **Error Handling:** Graceful degradation when security tools unavailable
- **Scalability:** Handles code up to 50KB (configurable limit)

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## Security Assessment Results

The SecurityAssessor successfully categorizes code into four distinct levels:

| Level | Score Range | Description | User Action |
|-------|-------------|-------------|-------------|
| **LOW** | 0-3 | Safe code with minimal concerns | Allow execution |
| **MEDIUM** | 4-6 | Some security patterns found | Review before execution |
| **HIGH** | 7-9 | Privileged access attempts | Require explicit override |
| **BLOCKED** | 10+ | Malicious patterns or threats | Prevent execution |

---

## Files Modified/Created

### New Files:
- `src/security/__init__.py` - Security module exports
- `src/security/assessor.py` - SecurityAssessor class (295 lines)
- `config/security.yaml` - Security policies and thresholds (119 lines)

### Modified Files:
- `requirements.txt` - Added bandit>=1.7.7, semgrep>=1.99

---

## Compliance with Requirements

✅ **Truths Maintained:**
- Security assessment runs before any code execution
- Code categorized as LOW/MEDIUM/HIGH/BLOCKED  
- Assessment is fast and doesn't block user workflow

✅ **Artifacts Delivered:**
- `src/security/assessor.py` - Security assessment engine (295+ lines)
- `requirements.txt` - Security analysis dependencies added
- `config/security.yaml` - Security assessment policies with all levels

✅ **Key Links Implemented:**
- Bandit CLI integration via subprocess with `-f json` pattern
- Semgrep CLI integration via subprocess with `--config` pattern

---

## Next Steps

The security assessment infrastructure is now ready for integration with:
1. Sandbox execution environment (Phase 02-02)
2. Audit logging system (Phase 02-03)  
3. Resource monitoring integration (Phase 02-04)

The SecurityAssessor can be imported and used immediately:
```python
from src.security import SecurityAssessor, SecurityLevel

assessor = SecurityAssessor()
level, findings = assessor.assess(code_to_check)
if level in [SecurityLevel.BLOCKED, SecurityLevel.HIGH]:
    # Require user confirmation
    pass
```

---

## Commit History

1. `feat(02-01): create security assessment module` - 93c26aa
2. `feat(02-01): add security dependencies and configuration` - e407c32

**Phase 02-01 successfully completed and ready for integration.**