soul-guardian

SKILL.md

---
name: soul-guardian
version: 0.0.9
description: Drift detection + baseline integrity guard for agent workspace files with automatic alerting support
homepage: https://clawsec.prompt.security
metadata: {"openclaw":{"emoji":"👻","category":"security"}}
clawdis:
  emoji: "👻"
  requires:
    bins: [python3]
---

# soul-guardian 👻

Protects your agent's core files (SOUL.md, AGENTS.md, etc.) from unauthorized changes with automatic detection, restoration, and **user alerting**.

## Vercel Skills Installation

Install with the Vercel Skills CLI for this harness:

```bash
npx skills add prompt-security/clawsec --skill soul-guardian -a openclaw -y
```

## Operational Notes

- Required runtime: `python3`
- Optional runtime: `openclaw` for cron integration, `launchctl` for macOS scheduling, `bash` for the demo helper
- Side effects: can auto-restore protected files to their approved baseline and writes audit/quarantine state locally
- Network behavior: none by default
- Trust model: any scheduling is opt-in, but restore mode intentionally overwrites drifted files

## Release Artifact Verification

For standalone installs, verify the signed release manifest before trusting `SKILL.md`, `skill.json`, or the archive. The `skill.json` file is the package metadata/SBOM source, and the release pipeline signs `checksums.json` with the ClawSec release key.

```bash
set -euo pipefail

SKILL_NAME="soul-guardian"
VERSION="0.0.9"
REPO="prompt-security/clawsec"
TAG="${SKILL_NAME}-v${VERSION}"
BASE="https://github.com/${REPO}/releases/download/${TAG}"
ZIP_NAME="${SKILL_NAME}-v${VERSION}.zip"
TMP_DIR="$(mktemp -d)"
trap 'rm -rf "$TMP_DIR"' EXIT

RELEASE_PUBKEY_SHA256="711424e4535f84093fefb024cd1ca4ec87439e53907b305b79a631d5befba9c8"

curl -fsSL "$BASE/checksums.json" -o "$TMP_DIR/checksums.json"
curl -fsSL "$BASE/checksums.sig" -o "$TMP_DIR/checksums.sig"
curl -fsSL "$BASE/signing-public.pem" -o "$TMP_DIR/signing-public.pem"
curl -fsSL "$BASE/$ZIP_NAME" -o "$TMP_DIR/$ZIP_NAME"
curl -fsSL "$BASE/SKILL.md" -o "$TMP_DIR/SKILL.md"
curl -fsSL "$BASE/skill.json" -o "$TMP_DIR/skill.json"

ACTUAL_PUBKEY_SHA256="$(openssl pkey -pubin -in "$TMP_DIR/signing-public.pem" -outform DER | shasum -a 256 | awk '{print $1}')"
if [ "$ACTUAL_PUBKEY_SHA256" != "$RELEASE_PUBKEY_SHA256" ]; then
  echo "ERROR: signing-public.pem fingerprint mismatch" >&2
  exit 1
fi

openssl base64 -d -A -in "$TMP_DIR/checksums.sig" -out "$TMP_DIR/checksums.sig.bin"
openssl pkeyutl -verify -rawin -pubin \
  -inkey "$TMP_DIR/signing-public.pem" \
  -sigfile "$TMP_DIR/checksums.sig.bin" \
  -in "$TMP_DIR/checksums.json" >/dev/null

hash_file() {
  if command -v shasum >/dev/null 2>&1; then
    shasum -a 256 "$1" | awk '{print $1}'
  else
    sha256sum "$1" | awk '{print $1}'
  fi
}

verify_manifest_file() {
  asset="$1"
  path="$2"
  expected="$(jq -r --arg asset "$asset" '.files[$asset].sha256 // empty' "$TMP_DIR/checksums.json")"
  if [ -z "$expected" ]; then
    echo "ERROR: checksums.json missing $asset" >&2
    exit 1
  fi
  actual="$(hash_file "$path")"
  if [ "$actual" != "$expected" ]; then
    echo "ERROR: checksum mismatch for $asset" >&2
    exit 1
  fi
}

expected_archive="$(jq -r '.archive.sha256 // empty' "$TMP_DIR/checksums.json")"
if [ -z "$expected_archive" ]; then
  echo "ERROR: checksums.json missing archive.sha256" >&2
  exit 1
fi
actual_archive="$(hash_file "$TMP_DIR/$ZIP_NAME")"
if [ "$actual_archive" != "$expected_archive" ]; then
  echo "ERROR: archive checksum mismatch" >&2
  exit 1
fi

verify_manifest_file "SKILL.md" "$TMP_DIR/SKILL.md"
verify_manifest_file "skill.json" "$TMP_DIR/skill.json"

echo "Signed release manifest, archive, SKILL.md, and skill.json verified."
```

Only install or extract the archive after this verification succeeds.

## Quick Start (3 Steps)

### Step 1: Initialize baselines
```bash
cd ~/.openclaw/workspace
python3 skills/soul-guardian/scripts/soul_guardian.py init --actor setup --note "initial baseline"
```

### Step 2: Enable monitoring
```bash
python3 skills/soul-guardian/scripts/soul_guardian.py enable-monitoring
```
This shows you how to add monitoring to your workflow.

### Step 3: Add to HEARTBEAT.md (Recommended)

Add this to your HEARTBEAT.md for automatic monitoring:

```markdown
## Soul Guardian Check
- Run `python3 skills/soul-guardian/scripts/soul_guardian.py check --actor heartbeat --output-format alert`
- If any output is produced, relay it to the user immediately as a security alert
```

That's it! Soul Guardian will now:
- ✅ Detect unauthorized changes to protected files
- ✅ Auto-restore SOUL.md and AGENTS.md to approved baseline
- ✅ Alert you when drift is detected and handled

---

## What it protects (default policy)

| File | Mode | Action on drift |
|------|------|-----------------|
| SOUL.md | restore | Auto-restore + alert |
| AGENTS.md | restore | Auto-restore + alert |
| USER.md | alert | Alert only |
| TOOLS.md | alert | Alert only |
| IDENTITY.md | alert | Alert only |
| HEARTBEAT.md | alert | Alert only |
| MEMORY.md | alert | Alert only |
| memory/*.md | ignore | Ignored |

## Commands

### Check for drift (with alert output)
```bash
python3 skills/soul-guardian/scripts/soul_guardian.py check --output-format alert
```
- Silent if no drift
- Outputs human-readable alert if drift detected
- Perfect for heartbeat integration

### Watch mode (continuous monitoring)
```bash
python3 skills/soul-guardian/scripts/soul_guardian.py watch --interval 30
```
Runs continuously, checking every 30 seconds.

### Approve intentional changes
```bash
python3 skills/soul-guardian/scripts/soul_guardian.py approve --file SOUL.md --actor user --note "intentional update"
```

### View status
```bash
python3 skills/soul-guardian/scripts/soul_guardian.py status
```

### Verify audit log integrity
```bash
python3 skills/soul-guardian/scripts/soul_guardian.py verify-audit
```

---

## Alert Format

When drift is detected, the `--output-format alert` produces output like:

```
==================================================
🚨 SOUL GUARDIAN SECURITY ALERT
==================================================

📄 FILE: SOUL.md
   Mode: restore
   Status: ✅ RESTORED to approved baseline
   Expected hash: abc123def456...
   Found hash:    789xyz000111...
   Diff saved: /path/to/patches/drift.patch

==================================================
Review changes and investigate the source of drift.
If intentional, run: soul_guardian.py approve --file <path>
==================================================
```

This output is designed to be relayed directly to the user in TUI/chat.

---

## Security Model

**What it does:**
- Detects filesystem drift vs approved baseline (sha256)
- Produces unified diffs for review
- Maintains tamper-evident audit log with hash chaining
- Refuses to operate on symlinks
- Uses atomic writes for restores

**What it doesn't do:**
- Cannot prove WHO made a change (actor is best-effort metadata)
- Cannot protect if attacker controls both workspace AND state directory
- Is not a substitute for backups

**Recommendation:** Store state directory outside workspace for better resilience.

---

## Demo

Run the full demo flow to see soul-guardian in action:

```bash
bash skills/soul-guardian/scripts/demo.sh
```

This will:
1. Verify clean state (silent check)
2. Inject malicious content into SOUL.md
3. Run heartbeat check (produces alert)
4. Show SOUL.md was restored

---

## Troubleshooting

**"Not initialized" error:**
Run `init` first to set up baselines.

**Drift keeps happening:**
Check what's modifying your files. Review the audit log and patches.

**Want to approve a change:**
Run `approve --file <path>` after reviewing the change.