708c898754
Harden git clone attack surface for remote scans with defense-in-depth: Layer 1 (all platforms): 8 git config flags disable hooks, symlinks, filter/smudge drivers, fsmonitor, local file protocol. 4 env vars isolate from system/user git config and block interactive prompts. Layer 2 (OS sandbox): macOS sandbox-exec and Linux bubblewrap (bwrap) restrict file writes to only the specific temp directory. bwrap probe-tests availability before use. Graceful fallback on Windows and Ubuntu 24.04+ (git config hardening only). Additional: post-clone 100MB size check, UUID-unique evidence filenames, evidence file cleanup, cleanup guarantee in scan/plugin-audit commands. 32 new tests (1147 total). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
74 lines
3.6 KiB
Markdown
74 lines
3.6 KiB
Markdown
---
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name: security:plugin-audit
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description: Audit a Claude Code plugin for security risks, permission analysis, and trust assessment before installation
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allowed-tools: Read, Glob, Grep, Bash, Agent
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model: sonnet
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---
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# /security plugin-audit [path|url]
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Audit a Claude Code plugin for security before installation. Accepts local paths or GitHub URLs.
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## Step 1: Resolve Target
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- If `$ARGUMENTS` contains `--branch <name>` → strip it, set `branch = <name>`
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- If `$ARGUMENTS` starts with `https://github.com/` or `git@github.com:` →
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Run: `node <plugin-root>/scanners/lib/git-clone.mjs clone "<url>" [--branch <branch>]`
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If exit code != 0 → show error to user and **STOP**
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Set `clone_path` = stdout (trimmed), `target = clone_path`
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Set `remote_url = <url>` for display
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- Else if `$ARGUMENTS` is non-empty → `target = $ARGUMENTS`, `clone_path = null`
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- Else → `target = "."`, `clone_path = null`
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- Verify `.claude-plugin/plugin.json` exists at `<target>`. If not and `clone_path != null` → cleanup clone_path first, then tell user this is not a plugin directory and **STOP**. If not and local → tell user and **STOP**.
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## IMPORTANT: Cleanup Guarantee (remote audits)
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If `clone_path != null`, the following cleanup MUST run regardless of audit outcome.
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If ANY step between clone and cleanup fails or errors, STILL run cleanup before stopping:
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1. `node <plugin-root>/scanners/lib/git-clone.mjs cleanup "<clone_path>"`
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2. `node <plugin-root>/scanners/lib/fs-utils.mjs cleanup "<evidence_file>"` (if `evidence_file` is set)
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## Step 1.5: Pre-extraction (remote audits only)
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If `clone_path != null`:
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Get temp path: `node <plugin-root>/scanners/lib/fs-utils.mjs tmppath "plugin-extract.json"`
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Run: `node <plugin-root>/scanners/content-extractor.mjs "<target>" --output-file "<evidence_file>"`
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If exit code != 0 → set `evidence_file = null` (fall back to direct scan)
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## Step 2: Inventory
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Read plugin.json (name, version, auto_discover). Glob for commands, agents, hooks, skills, knowledge. Build permission matrix from all `allowed-tools` and `tools` declarations. Flag: Bash access, Bash+Write combo, Task (sub-agent spawning), opus for trivial tasks.
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## Step 3: Analyze Hooks
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If `hooks/hooks.json` exists: parse events, read scripts, classify (block/warn/modify). Flag: state modification, network calls, non-CLAUDE env vars, SessionStart hooks.
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## Step 4: Scan Content
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Spawn `subagent_type: "llm-security:skill-scanner-agent"`, `model: "sonnet"`:
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If `evidence_file` is set:
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> EVIDENCE-PACKAGE MODE. Read: \<evidence_file\>
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> Read: \<plugin-root\>/knowledge/skill-threat-patterns.md
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> Analyze all sections. DO NOT use Read/Glob/Grep on the target directory.
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> Check all 7 threat categories. Return findings: file, severity, OWASP ref.
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Otherwise:
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> Scan plugin at \<path\>: commands/*.md, agents/*.md, hooks/scripts/*, skills/*/SKILL.md, knowledge/**/*.md.
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> Read: \<plugin-root\>/knowledge/skill-threat-patterns.md
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> Check all 7 threat categories. Return findings: file, severity, OWASP ref.
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## Step 5: Report
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Output: Plugin metadata, component inventory, permission matrix, hook analysis, security findings, trust verdict.
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Verdict: **Install** (0 critical/high, transparent hooks) | **Review** (high findings or unclear permissions) | **Do Not Install** (critical, exfiltration, persistence, or hidden instructions).
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## Step 6: Cleanup (only if remote)
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If `clone_path != null`:
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Run: `node <plugin-root>/scanners/lib/git-clone.mjs cleanup "<clone_path>"`
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If cleanup fails → warn: "Could not remove temp dir <clone_path> — remove manually."
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If `evidence_file != null`:
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Run: `node <plugin-root>/scanners/lib/fs-utils.mjs cleanup "<evidence_file>"`
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