thanhnvandClaude Sonnet 4.6
3e7690fe37
Root cause: tool-audit-lib.sh signs tool-calls-head.sig with a local RSA key (~/.casan/audit-keys/), but sign-audit-head.sh (called as a CI step) overwrites audit-public.pem with the Vault KMS public key. On the second run inside security-gate.sh, the local key still exists so audit-public.pem is NOT updated, leaving a Vault key vs local-key mismatch that causes verify-tool-audit.sh to exit 1. Fix 1 — sign-audit-head.sh: after signing the audit.jsonl chain via Vault KMS, also re-sign the tool-calls chain head with the same casan-audit-key. Both chains are now anchored to the same Vault public key in audit-public.pem. Fix 2 — run-casan4-harness-tests.sh: call sign-audit-head.sh just before the inline verify-tool-audit.sh check (line 217). This re-signs both chains with Vault KMS so the inline check sees anchor=signed instead of mismatched local key vs Vault pub. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
113 lines
4.2 KiB
Bash
Executable File
113 lines
4.2 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -euo pipefail
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# CASAN H5 — Sign the audit chain head hash via Vault KMS (or local key fallback).
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#
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# Called by CI after harness tests rebuild audit.jsonl, so that
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# verify-audit-chain.sh produces "anchor=signed" (not "anchor=unsigned").
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#
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# Usage:
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# sign-audit-head.sh [audit-jsonl]
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#
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# Writes:
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# <audit-dir>/audit-head.txt — the head hash (plain text)
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# <audit-dir>/audit-head.sig — RSA signature of audit-head.txt
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#
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# After this script, verify-audit-chain.sh reports:
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# AUDIT_CHAIN_VALID anchor=signed
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#
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# Environment (KMS path):
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# VAULT_ADDR — e.g. http://vault:8200
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# VAULT_TOKEN — token with transit/sign/casan-audit-key capability
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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PROJECT_ROOT="$(cd "$SCRIPT_DIR/../../.." && pwd)"
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AUDIT_LOG="${1:-$PROJECT_ROOT/.specify/logs/audit/audit.jsonl}"
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AUDIT_DIR="$(dirname "$AUDIT_LOG")"
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HEAD_FILE="$AUDIT_DIR/audit-head.txt"
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HEAD_SIG="$AUDIT_DIR/audit-head.sig"
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AUDIT_PUB="$PROJECT_ROOT/.specify/level5/central-governance/audit-public.pem"
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if [[ ! -f "$AUDIT_LOG" ]]; then
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echo "SIGN_AUDIT_HEAD_SKIP audit.jsonl not found" >&2
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exit 0
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fi
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# ── Compute the current chain head ────────────────────────────────────────
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HEAD_HASH="$(python - "$AUDIT_LOG" <<'PY'
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import hashlib, json, sys
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path = sys.argv[1]
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previous = ""
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with open(path, encoding="utf-8") as f:
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for line in f:
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if not line.strip():
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continue
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record = json.loads(line)
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core = "|".join([
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record.get("timestamp",""), record.get("trace_id",""),
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record.get("action",""), record.get("actor",""),
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record.get("risk_level",""), record.get("decision",""),
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record.get("approval_status",""), record.get("approver",""),
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record.get("input_hash",""), record.get("output_hash",""),
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previous,
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])
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previous = hashlib.sha256(core.encode()).hexdigest()
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print(previous)
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PY
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)"
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if [[ -z "$HEAD_HASH" ]]; then
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echo "SIGN_AUDIT_HEAD_SKIP empty chain" >&2
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exit 0
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fi
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printf '%s' "$HEAD_HASH" > "$HEAD_FILE"
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# ── Sign the head file ────────────────────────────────────────────────────
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VAULT_KMS="$SCRIPT_DIR/vault-kms.sh"
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if [[ -n "${VAULT_ADDR:-}" && -n "${VAULT_TOKEN:-}" ]] && \
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curl -sf "$VAULT_ADDR/v1/sys/health" >/dev/null 2>&1; then
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# KMS path — sign via Vault Transit, export public key
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bash "$VAULT_KMS" enable-transit
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bash "$VAULT_KMS" sign "$HEAD_FILE" "$HEAD_SIG" "casan-audit-key"
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bash "$VAULT_KMS" pubkey "$AUDIT_PUB" "casan-audit-key"
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echo "SIGN_AUDIT_HEAD_OK head=$HEAD_HASH anchor=vault-kms"
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# Also re-sign the tool-calls chain head with the same Vault key so that
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# verify-tool-audit.sh can verify using the same audit-public.pem.
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TOOL_LOG="$AUDIT_DIR/tool-calls.jsonl"
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if [[ -f "$TOOL_LOG" ]]; then
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TOOL_HEAD="$(python - "$TOOL_LOG" <<'PY'
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import hashlib, json, sys
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prev = ""
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with open(sys.argv[1], encoding="utf-8") as f:
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for line in f:
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if not line.strip(): continue
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rec = json.loads(line)
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stored = rec.pop("record_hash", "")
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core = json.dumps(rec, sort_keys=True, separators=(",", ":"))
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if hashlib.sha256((prev + "|" + core).encode()).hexdigest() != stored:
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raise SystemExit("TOOL_CHAIN_BROKEN")
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prev = stored
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sys.stdout.write(prev)
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PY
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)"
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if [[ -n "$TOOL_HEAD" ]]; then
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printf '%s' "$TOOL_HEAD" > "$AUDIT_DIR/tool-calls-head.txt"
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bash "$VAULT_KMS" sign "$AUDIT_DIR/tool-calls-head.txt" "$AUDIT_DIR/tool-calls-head.sig" "casan-audit-key"
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echo "SIGN_TOOL_AUDIT_HEAD_OK head=$TOOL_HEAD anchor=vault-kms"
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fi
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fi
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else
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# Fallback — local key (dev environment without Vault)
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AUDIT_PRIV="$PROJECT_ROOT/.specify/level5/central-governance/audit-private.pem"
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if [[ ! -f "$AUDIT_PRIV" ]]; then
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echo "SIGN_AUDIT_HEAD_SKIP no private key and VAULT_ADDR not set — verify will show anchor=unsigned" >&2
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exit 0
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fi
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openssl dgst -sha256 -sign "$AUDIT_PRIV" -out "$HEAD_SIG" "$HEAD_FILE"
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echo "SIGN_AUDIT_HEAD_OK head=$HEAD_HASH anchor=local-file"
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fi
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