feat skill-install install script and security scan

skills/skill-install/references/security_scan_prompt.md

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+# Security Scan Prompt for Skills
+
+Use this prompt template to analyze skill content for security vulnerabilities before installation.
+
+## Prompt Template
+
+```
+You are a security expert analyzing a Claude skill for potential security risks.
+
+Analyze the following skill content for security vulnerabilities:
+
+**Skill Name:** {skill_name}
+**Skill Content:**
+{skill_content}
+
+## Security Analysis Criteria
+
+Examine the skill for the following security concerns:
+
+### 1. Malicious Command Execution
+- Detect `eval()`, `exec()`, `subprocess` with `shell=True`
+- Identify arbitrary code execution patterns
+- Check for command injection vulnerabilities
+
+### 2. Backdoor Detection
+- Look for obfuscated code (base64, hex encoding)
+- Identify suspicious network requests to unknown domains
+- Detect file hash patterns matching known malware
+- Check for hidden data exfiltration mechanisms
+
+### 3. Credential Theft
+- Detect attempts to access environment variables containing secrets
+- Identify file operations on sensitive paths (~/.ssh, ~/.aws, ~/.netrc)
+- Check for credential harvesting patterns
+- Look for keylogging or clipboard monitoring
+
+### 4. Unauthorized Network Access
+- Identify external network requests
+- Check for connections to suspicious domains (pastebin, ngrok, bit.ly, etc.)
+- Detect data exfiltration via HTTP/HTTPS
+- Look for reverse shell patterns
+
+### 5. File System Abuse
+- Detect destructive file operations (rm -rf, shutil.rmtree)
+- Identify unauthorized file writes to system directories
+- Check for file permission modifications
+- Look for attempts to modify critical system files
+
+### 6. Privilege Escalation
+- Detect sudo or privilege escalation attempts
+- Identify attempts to modify system configurations
+- Check for container escape patterns
+
+### 7. Supply Chain Attacks
+- Identify suspicious package installations
+- Detect dynamic imports from untrusted sources
+- Check for dependency confusion attacks
+
+## Output Format
+
+Provide your analysis in the following format:
+
+**Security Status:** [SAFE / WARNING / DANGEROUS]
+
+**Risk Level:** [LOW / MEDIUM / HIGH / CRITICAL]
+
+**Findings:**
+1. [Category]: [Description]
+   - File: [filename:line_number]
+   - Severity: [LOW/MEDIUM/HIGH/CRITICAL]
+   - Details: [Explanation]
+   - Recommendation: [How to fix or mitigate]
+
+**Summary:**
+[Brief summary of the security assessment]
+
+**Recommendation:**
+[APPROVE / REJECT / APPROVE_WITH_WARNINGS]
+
+## Decision Criteria
+
+- **APPROVE**: No security issues found, safe to install
+- **APPROVE_WITH_WARNINGS**: Minor concerns but generally safe, user should be aware
+- **REJECT**: Critical security issues found, do not install
+
+Be thorough but avoid false positives. Consider the context and legitimate use cases.
+```
+
+## Example Analysis
+
+### Safe Skill Example
+
+```
+**Security Status:** SAFE
+**Risk Level:** LOW
+**Findings:** None
+**Summary:** The skill contains only documentation and safe tool usage instructions. No executable code or suspicious patterns detected.
+**Recommendation:** APPROVE
+```
+
+### Suspicious Skill Example
+
+```
+**Security Status:** WARNING
+**Risk Level:** MEDIUM
+**Findings:**
+1. [Network Access]: External HTTP request detected
+   - File: scripts/helper.py:42
+   - Severity: MEDIUM
+   - Details: Script makes HTTP request to api.example.com without user consent
+   - Recommendation: Review the API endpoint and ensure it's legitimate
+
+**Summary:** The skill makes external network requests that should be reviewed.
+**Recommendation:** APPROVE_WITH_WARNINGS
+```
+
+### Dangerous Skill Example
+
+```
+**Security Status:** DANGEROUS
+**Risk Level:** CRITICAL
+**Findings:**
+1. [Command Injection]: Arbitrary command execution detected
+   - File: scripts/malicious.py:15
+   - Severity: CRITICAL
+   - Details: Uses subprocess.call() with shell=True and unsanitized input
+   - Recommendation: Do not install this skill
+
+2. [Data Exfiltration]: Suspicious network request
+   - File: scripts/malicious.py:28
+   - Severity: HIGH
+   - Details: Sends data to pastebin.com without user knowledge
+   - Recommendation: This appears to be a data exfiltration attempt
+
+**Summary:** This skill contains critical security vulnerabilities including command injection and data exfiltration. It appears to be malicious.
+**Recommendation:** REJECT
+```