NanoClaw Traffic Guardian#

This is a baseline specification skill. It intentionally does not ship a proxy or runtime implementation yet.

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="nanoclaw-traffic-guardian"
VERSION="0.0.1-beta2"
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.

Scope#

Builders should use this skill as the NanoClaw landing zone for runtime traffic monitoring:

• host-side HTTP proxy inspection
• optional HTTPS inspection with host-held CA material
• outbound exfiltration detection
• inbound injection detection
• redacted local threat logs
• MCP tools for status, findings, and config checks
• IPC handlers for container-safe host communication

Prefer this as an optional companion to clawsec-nanoclaw, not as a mandatory extension of the existing advisory/signature/integrity suite.

Safety Contract#

• Opt-in only.
• Detect-and-log by default.
• No automatic system CA installation.
• No CA private key access from the container.
• No blocking in the first implementation.
• Redact secrets before logs or MCP responses.
• Keep all state under NANOCLAW_TRAFFIC_GUARDIAN_HOME or the host-managed NanoClaw security data directory.

Builder Entry Points#

Read SPEC.md before implementing. Use the placeholder folders as follows:

PathIntended uselib/Detector rules, redaction, types, report formattinghost-services/Host-side proxy lifecycle, log access, IPC handlersmcp-tools/Container-side MCP tools for status and findingstest/Unit tests, host/container IPC tests, redaction tests

Required First Implementation Behavior#

1. Validate config without starting the proxy.
2. Start monitor through a host-managed lifecycle path.
3. Keep CA key material on the host side.
4. Inspect HTTP request/response text up to a bounded byte limit.
5. Support optional HTTPS MITM only when the operator supplies per-runtime trust configuration.
6. Emit JSONL findings with redacted snippets.
7. Expose MCP tools that return status and redacted findings only.

Out of Scope for v0.0.1 Implementation#

• automatic system trust-store mutation
• transparent network interception
• default blocking
• sending traffic to external services
• exposing raw request/response bodies to the container