feat: harden chat state by tenant

packages/casan-harness/scripts/bash/chat-readonly.py

@@ -39,22 +39,41 @@ ROOT = project_root()
 HARNESS_BIN = os.path.join(ROOT, "packages", "casan-harness", "scripts", "bash")
 ROUTER = os.path.join(HARNESS_BIN, "prompt-mode-router.py")
 SECURITY = os.path.join(HARNESS_BIN, "security-check.sh")
+TENANT_STORE = os.path.join(HARNESS_BIN, "tenant-store.sh")
+TENANT_CRYPT = os.path.join(HARNESS_BIN, "tenant-crypt.sh")
 
 
 def state_root() -> str:
     return os.environ.get("CASAN_STATE_ROOT") or os.path.join(ROOT, ".specify")
 
 
+def tenant_path(logical: str, fallback: str) -> str:
+    if os.environ.get("CASAN_TENANT_ID"):
+        r = subprocess.run(["bash", TENANT_STORE, "resolve", logical], cwd=ROOT, capture_output=True, text=True)
+        if r.returncode != 0:
+            raise SystemExit((r.stderr or r.stdout or "TENANT_DENIED").strip())
+        return r.stdout.strip()
+    return os.path.join(state_root(), fallback)
+
+
+def guarded_override(path: str) -> str:
+    if path and os.environ.get("CASAN_TENANT_ID"):
+        r = subprocess.run(["bash", TENANT_STORE, "guard", path], cwd=ROOT, capture_output=True, text=True)
+        if r.returncode != 0:
+            raise SystemExit((r.stderr or r.stdout or "TENANT_DENIED").strip())
+    return path
+
+
 def audit_path() -> str:
-    return os.environ.get("CASAN_CHAT_AUDIT_LOG") or os.path.join(state_root(), "logs", "chat", "chat-turns.jsonl")
+    return guarded_override(os.environ["CASAN_CHAT_AUDIT_LOG"]) if os.environ.get("CASAN_CHAT_AUDIT_LOG") else tenant_path("chat/chat-turns.jsonl", "logs/chat/chat-turns.jsonl")
 
 
 def head_path() -> str:
-    return os.environ.get("CASAN_CHAT_AUDIT_HEAD") or os.path.join(state_root(), "logs", "chat", "chat-head.txt")
+    return guarded_override(os.environ["CASAN_CHAT_AUDIT_HEAD"]) if os.environ.get("CASAN_CHAT_AUDIT_HEAD") else tenant_path("chat/chat-head.txt", "logs/chat/chat-head.txt")
 
 
 def metrics_path() -> str:
-    return os.environ.get("CASAN_CHAT_METRICS_LOG") or os.path.join(state_root(), "logs", "cost", "metrics.jsonl")
+    return guarded_override(os.environ["CASAN_CHAT_METRICS_LOG"]) if os.environ.get("CASAN_CHAT_METRICS_LOG") else tenant_path("telemetry/cost/metrics.jsonl", "logs/cost/metrics.jsonl")
 
 
 def now_iso() -> str:
@@ -223,9 +242,18 @@ def record_turn(base):
     os.makedirs(os.path.dirname(head_path()), exist_ok=True)
     with open(head_path(), "w", encoding="utf-8") as fh:
         fh.write(record_hash + "\n")
+    encrypt_chat_audit_snapshot(path)
     return rec
 
 
+def encrypt_chat_audit_snapshot(path: str):
+    if not os.environ.get("CASAN_TENANT_ID"):
+        return
+    if not os.path.isfile(path):
+        return
+    subprocess.run(["bash", TENANT_CRYPT, "encrypt", path, path + ".enc"], cwd=ROOT, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+
+
 def record_metrics(trace_id: str, message: str, answer: str, status: str, latency_ms: int):
     input_tokens = len(message.split())
     output_tokens = len(answer.split())
@@ -253,6 +281,8 @@ def record_metrics(trace_id: str, message: str, answer: str, status: str, latenc
 
 
 def ask(args):
+    if args.tenant and args.tenant != "default":
+        os.environ["CASAN_TENANT_ID"] = args.tenant
     started = datetime.now(timezone.utc)
     trace_id = str(uuid.uuid4())
     message = args.message