picoclaw-traffic-guardian

Picoclaw 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.

set -euo pipefail

SKILL_NAME="picoclaw-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 Picoclaw landing zone for runtime traffic monitoring:

• lightweight AI gateway HTTP proxy inspection
• optional HTTPS inspection with per-process CA trust
• outbound exfiltration detection
• inbound injection detection
• redacted local threat logs
• profile export for picoclaw-security-guardian

Do not add proxy runtime ownership to picoclaw-security-guardian or picoclaw-self-pen-testing. Those skills should profile, drift-check, or review this monitor's status, not run it.

Safety Contract

• Opt-in only.
• Detect-and-log by default.
• No automatic system CA installation.
• No global proxy environment changes.
• No blocking in the first implementation.
• Redact secrets before logs, summaries, or profile outputs.
• Keep all state under PICOCLAW_TRAFFIC_GUARDIAN_HOME or $PICOCLAW_HOME/security/clawsec/traffic-guardian.

Builder Entry Points

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

Required First Implementation Behavior

1. Validate config without starting the proxy.
2. Start monitor in foreground or explicit background mode.
3. Scope proxy environment variables to the target Picoclaw gateway process.
4. Inspect HTTP request/response text up to a bounded byte limit.
5. Support optional HTTPS MITM only when the operator supplies per-process trust configuration.
6. Emit JSONL findings with redacted snippets.
7. Export a small profile fragment that picoclaw-security-guardian can include in deterministic posture profiles.

Out of Scope for v0.0.1 Implementation

• automatic system trust-store mutation
• transparent network interception
• default blocking
• sending traffic to external services
• collecting full request/response bodies