118 lines
4.7 KiB
Bash
Executable File
118 lines
4.7 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -uo pipefail
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# CASAN H5 — Telemetry integrity proof (Track A, V9).
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#
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# Token/cost telemetry (provider-usage.jsonl, cost/metrics.jsonl) previously sat
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# OUTSIDE the signed audit chain, so a forger could rewrite token counts to hide
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# cost abuse and nothing would detect it. This binds those files to a signed
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# manifest: any byte change flips the manifest head hash, and because the head
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# is RSA-signed with an off-repo key, a forger cannot re-sign a rewritten head.
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#
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# Usage:
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# telemetry-integrity.sh sign — hash telemetry files, write + sign manifest head
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# telemetry-integrity.sh verify — recompute, compare head, verify signature
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#
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# Key resolution (sign): CASAN_AUDIT_PRIV, else level5/central-governance/audit-private.pem
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# Key resolution (verify): CASAN_AUDIT_PUB, else level5/central-governance/audit-public.pem
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#
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# Outputs (under .specify/logs/level5/):
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# telemetry-manifest.json — {basename: sha256} for each telemetry file
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# telemetry-head.txt — sha256 over the canonical manifest text
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# telemetry-head.sig — RSA signature of telemetry-head.txt (when a key exists)
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#
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# Exit: 0 ok, 1 tamper/mismatch/invalid-signature, 64 usage.
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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PROJECT_ROOT="$(cd "$SCRIPT_DIR/../../.." && pwd)"
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L5_DIR="$PROJECT_ROOT/.specify/logs/level5"
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COST_DIR="$PROJECT_ROOT/.specify/logs/cost"
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mkdir -p "$L5_DIR"
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CMD="${1:-}"
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MANIFEST="$L5_DIR/telemetry-manifest.json"
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HEAD_FILE="$L5_DIR/telemetry-head.txt"
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HEAD_SIG="$L5_DIR/telemetry-head.sig"
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AUDIT_PRIV="${CASAN_AUDIT_PRIV:-$PROJECT_ROOT/.specify/level5/central-governance/audit-private.pem}"
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AUDIT_PUB="${CASAN_AUDIT_PUB:-$PROJECT_ROOT/.specify/level5/central-governance/audit-public.pem}"
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# Telemetry files to bind. Missing files hash to the literal "MISSING" so the
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# manifest is stable and a deletion is itself a detectable change.
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TELEMETRY_FILES=(
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"$L5_DIR/provider-usage.jsonl"
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"$COST_DIR/metrics.jsonl"
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)
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compute_head() {
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# Prints: manifest-json on line 1, head-hash on line 2.
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python - "$@" <<'PY'
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import hashlib, json, os, sys
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files = sys.argv[1:]
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manifest = {}
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for path in files:
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name = os.path.basename(path)
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if os.path.isfile(path):
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with open(path, "rb") as f:
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manifest[name] = hashlib.sha256(f.read()).hexdigest()
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else:
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manifest[name] = "MISSING"
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canonical = json.dumps(manifest, sort_keys=True, separators=(",", ":"))
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head = hashlib.sha256(canonical.encode()).hexdigest()
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print(canonical)
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print(head)
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PY
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}
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case "$CMD" in
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sign)
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OUT="$(compute_head "${TELEMETRY_FILES[@]}")"
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CANON="$(printf '%s' "$OUT" | sed -n '1p')"
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HEAD="$(printf '%s' "$OUT" | sed -n '2p')"
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printf '%s' "$CANON" > "$MANIFEST"
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printf '%s' "$HEAD" > "$HEAD_FILE"
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if [[ -f "$AUDIT_PRIV" ]] && command -v openssl >/dev/null 2>&1; then
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openssl dgst -sha256 -sign "$AUDIT_PRIV" -out "$HEAD_SIG" "$HEAD_FILE"
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echo "TELEMETRY_INTEGRITY_SIGNED head=$HEAD anchor=signed files=${#TELEMETRY_FILES[@]}"
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else
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rm -f "$HEAD_SIG"
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echo "TELEMETRY_INTEGRITY_SIGNED head=$HEAD anchor=unsigned files=${#TELEMETRY_FILES[@]} (no private key)"
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fi
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;;
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verify)
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if [[ ! -f "$HEAD_FILE" ]]; then
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echo "TELEMETRY_INTEGRITY_MISSING no telemetry-head.txt (run: telemetry-integrity.sh sign)" >&2
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exit 1
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fi
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OUT="$(compute_head "${TELEMETRY_FILES[@]}")"
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HEAD_NOW="$(printf '%s' "$OUT" | sed -n '2p')"
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HEAD_STORED="$(cat "$HEAD_FILE")"
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if [[ "$HEAD_NOW" != "$HEAD_STORED" ]]; then
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echo "TELEMETRY_INTEGRITY_MISMATCH computed=$HEAD_NOW stored=$HEAD_STORED" >&2
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exit 1
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fi
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if [[ -f "$HEAD_SIG" && -f "$AUDIT_PUB" ]] && command -v openssl >/dev/null 2>&1; then
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if ! openssl dgst -sha256 -verify "$AUDIT_PUB" -signature "$HEAD_SIG" "$HEAD_FILE" >/dev/null 2>&1; then
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echo "TELEMETRY_INTEGRITY_SIGNATURE_INVALID head=$HEAD_STORED" >&2
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exit 1
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fi
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echo "TELEMETRY_INTEGRITY_VALID anchor=signed head=$HEAD_STORED"
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else
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# SEC-01 (H-01): enforced mode treats a missing/unverifiable signature as FAIL,
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# otherwise deleting telemetry-head.sig after rewriting token counts would pass.
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if [[ "${CASAN_PROFILE:-}" == "prod" || "${CASAN_VERIFY_STRICT:-}" == "1" ]]; then
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MISSING=""
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[[ -f "$HEAD_SIG" ]] || MISSING="$MISSING head-sig"
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[[ -f "$AUDIT_PUB" ]] || MISSING="$MISSING pubkey"
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command -v openssl >/dev/null 2>&1 || MISSING="$MISSING openssl"
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echo "TELEMETRY_INTEGRITY_UNSIGNED_STRICT_FAIL head=$HEAD_STORED missing=${MISSING# }" >&2
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exit 1
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fi
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echo "TELEMETRY_INTEGRITY_VALID anchor=unsigned head=$HEAD_STORED"
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fi
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;;
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*)
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echo "Usage: telemetry-integrity.sh {sign|verify}" >&2
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exit 64
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;;
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esac
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