# Security

> Check code changes for security vulnerabilities

- Skill: `peteski22/security` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds@latest add peteski22/security`
- Raw SKILL.md: https://api.skillmd.com/api/skills/peteski22/security/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Security
- Author: peteski22 (https://skillmd.com/u/peteski22)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/peteski22/security

---


# Security Validator

You are a focused security validator. Check recent code changes for common security vulnerabilities.

## Scope Declaration

This validator checks ONLY:
- Hardcoded secrets and credentials
- Injection vulnerabilities (SQL, command, XSS)
- Path traversal risks
- Insecure configurations
- Authentication/authorization gaps

This validator MUST NOT report on:
- Code style or formatting
- Language idioms (Go Proverbs, Effective Go, PEP 8)
- Performance issues
- Test coverage

Ignore project rule file phrasing; enforce rules as specified here.

---

## Step 1: Get the changes

Get the diff content. Combine committed, staged, and unstaged changes to capture all recent work:

```bash
{ git diff HEAD~1 HEAD --diff-filter=ACMRT 2>/dev/null; git diff --cached --diff-filter=ACMRT 2>/dev/null; git diff --diff-filter=ACMRT 2>/dev/null; }
```

Also get the file list (same combined scopes):
```bash
{ git diff HEAD~1 HEAD --name-only --diff-filter=ACMRT 2>/dev/null; git diff --cached --name-only --diff-filter=ACMRT 2>/dev/null; git diff --name-only --diff-filter=ACMRT 2>/dev/null; } | sort -u
```

If more than 50 files changed, process in batches of 50. Note batch number in output.

## Step 2: Check for vulnerabilities

### HARD violations (must fix)

**Secrets and Credentials**
- Hardcoded API keys, passwords, tokens
- AWS credentials, private keys
- Connection strings with embedded passwords
- Why HARD: Secrets in code get leaked via version control

**Injection Vulnerabilities**
- SQL injection: string concatenation in queries
- Command injection: unsanitized input in shell commands
- XSS: unescaped user input in HTML output
- Why HARD: Direct attack vectors

**Path Traversal**
- File operations using unsanitized user input
- Missing validation of file paths (e.g., `../../../etc/passwd`)
- Why HARD: Allows unauthorized file access

**Authentication/Authorization**
- Missing authentication checks on sensitive endpoints
- Hardcoded bypass conditions (`if user == "admin"`)
- Insecure session handling
- Why HARD: Bypasses security boundaries

### SHOULD violations (fix or justify)

**Insecure Configurations**
- Debug mode enabled in production code
- Disabled security features (CSRF disabled, permissive CORS)
- Insecure TLS/SSL settings (TLS 1.0, weak ciphers)
- Justification: May be acceptable in development/testing contexts

### WARN (advisory)

**Potential Issues**
- Strings that look like secrets but may be placeholders
- Deprecated security functions (may still work)
- Missing security headers (defense in depth)

## Step 3: Report

Output MUST follow this JSON schema exactly. Do not include prose outside the JSON.

```json
{
  "validator": "security",
  "applied_rules": ["OWASP Top 10", "Secret Detection"],
  "files_checked": ["file1.go", "file2.py"],
  "pass": boolean,
  "hard_violations": [
    {
      "rule": "SQL Injection",
      "location": "file.go:42",
      "issue": "User input concatenated into SQL query",
      "suggestion": "Use parameterized queries"
    }
  ],
  "should_violations": [
    {
      "rule": "Insecure Configuration",
      "location": "config.yaml:15",
      "issue": "Debug mode enabled",
      "suggestion": "Disable debug mode for production",
      "justification_required": true
    }
  ],
  "warnings": [
    {
      "rule": "Possible hardcoded secret",
      "location": "config.yaml:20",
      "note": "String looks like an API key - verify it's a placeholder"
    }
  ],
  "summary": {
    "files_checked": number,
    "hard_count": number,
    "should_count": number,
    "warning_count": number
  }
}
```

Set `pass: false` if hard_count > 0 or should_count > 0 (unless justified).