fix(cli): redact security.recovery_passphrase_hash in show_cmd

Adjacent secret leak in show_cmd noticed during Task 3 code review.
SecurityConfig has two sensitive fields and the redaction block only
covered pin_hash. vigilar config show would print the recovery
passphrase hash verbatim whenever one was configured.

One-line fix; same redaction pattern as the surrounding secrets.
Part of issue #2.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/conftest.py

@@ -11,6 +11,28 @@ from vigilar.config import VigilarConfig, load_config
 from vigilar.storage.schema import metadata
 
 
+@pytest.fixture(autouse=True, scope="session")
+def _isolate_vigilar_config(tmp_path_factory):
+    """Prevent tests from writing to the real config/vigilar.toml.
+
+    Web endpoint handlers that call `_save_and_reload()` read the target
+    path from the VIGILAR_CONFIG env var, falling back to the relative
+    `"config/vigilar.toml"`. Without this fixture, any test that exercises
+    such an endpoint rewrites the repo's committed config file via a
+    Pydantic round-trip, stripping comments and non-default fields.
+    """
+    tmp_config = tmp_path_factory.mktemp("vigilar-config") / "vigilar.toml"
+    prev = os.environ.get("VIGILAR_CONFIG")
+    os.environ["VIGILAR_CONFIG"] = str(tmp_config)
+    try:
+        yield
+    finally:
+        if prev is None:
+            os.environ.pop("VIGILAR_CONFIG", None)
+        else:
+            os.environ["VIGILAR_CONFIG"] = prev
+
+
 def _create_test_engine(db_path: Path):
     """Create a fresh engine for testing (bypasses the global singleton)."""
     db_path.parent.mkdir(parents=True, exist_ok=True)

tests/unit/test_cli_set_pin.py

@@ -0,0 +1,31 @@
+"""Tests for `vigilar config set-pin`."""
+
+from click.testing import CliRunner
+
+from vigilar.alerts.pin import verify_pin
+from vigilar.cli.cmd_config import config_cmd
+
+
+def test_set_pin_outputs_pbkdf2_hash_under_security_section():
+    """The CLI must emit a hash that alerts.pin.verify_pin can validate,
+    and direct the user to [security] pin_hash (not [system] arm_pin_hash)."""
+    runner = CliRunner()
+    result = runner.invoke(config_cmd, ["set-pin"], input="1234\n1234\n")
+
+    assert result.exit_code == 0, result.output
+    # The output must direct the user to the [security] section
+    assert "[security]" in result.output
+    assert "arm_pin_hash" not in result.output
+    assert "pin_hash" in result.output
+
+    # Extract the emitted hash (line starts with `pin_hash = "..."`)
+    hash_line = next(
+        line for line in result.output.splitlines() if line.strip().startswith("pin_hash")
+    )
+    hash_value = hash_line.split('"')[1]
+
+    # Round-trip: the emitted hash must accept the plaintext PIN
+    assert verify_pin("1234", hash_value) is True
+    assert verify_pin("0000", hash_value) is False
+    # And it must be in PBKDF2 format (not the legacy HMAC "secret:mac" format)
+    assert hash_value.startswith("pbkdf2_sha256$")

tests/unit/test_events.py

@@ -1,6 +1,5 @@
 """Tests for the Phase 6 events subsystem: rules, arm state FSM, history."""
 
-import hashlib
 import time
 
 import pytest
@@ -19,7 +18,7 @@ from vigilar.storage.queries import insert_event
 
 def _make_config(rules=None, pin_hash=""):
     return VigilarConfig(
-        system={"arm_pin_hash": pin_hash},
+        security={"pin_hash": pin_hash},
         cameras=[],
         sensors=[],
         rules=rules or [],
@@ -27,7 +26,8 @@ def _make_config(rules=None, pin_hash=""):
 
 
 def _pin_hash(pin: str) -> str:
-    return hashlib.sha256(pin.encode()).hexdigest()
+    from vigilar.alerts.pin import hash_pin
+    return hash_pin(pin)
 
 
 # ---------------------------------------------------------------------------

vigilar/cli/cmd_config.py

@@ -47,8 +47,10 @@ def show_cmd(config_path: str | None) -> None:
         # Redact sensitive fields
         if data.get("web", {}).get("password_hash"):
             data["web"]["password_hash"] = "***"
-        if data.get("system", {}).get("arm_pin_hash"):
-            data["system"]["arm_pin_hash"] = "***"
+        if data.get("security", {}).get("pin_hash"):
+            data["security"]["pin_hash"] = "***"
+        if data.get("security", {}).get("recovery_passphrase_hash"):
+            data["security"]["recovery_passphrase_hash"] = "***"
         if data.get("alerts", {}).get("webhook", {}).get("secret"):
             data["alerts"]["webhook"]["secret"] = "***"
         click.echo(json.dumps(data, indent=2))
@@ -82,14 +84,10 @@ def set_password_cmd(config_path: str | None) -> None:
 
 @config_cmd.command("set-pin")
 def set_pin_cmd() -> None:
-    """Generate an HMAC hash for the arm/disarm PIN."""
-    import hashlib
-    import hmac
-    import os
+    """Generate a PBKDF2 hash for the arm/disarm PIN."""
+    from vigilar.alerts.pin import hash_pin
 
     pin = click.prompt("Enter arm/disarm PIN", hide_input=True, confirmation_prompt=True)
-    secret = os.urandom(32)
-    mac = hmac.new(secret, pin.encode(), hashlib.sha256).hexdigest()
-    hash_str = secret.hex() + ":" + mac
-    click.echo(f"\nAdd this to your vigilar.toml [system] section:")
-    click.echo(f'arm_pin_hash = "{hash_str}"')
+    hash_str = hash_pin(pin)
+    click.echo("\nAdd this to your vigilar.toml [security] section:")
+    click.echo(f'pin_hash = "{hash_str}"')

vigilar/constants.py

@@ -210,6 +210,8 @@ class Topics:
     SYSTEM_ALERT = "vigilar/system/alert"
     SYSTEM_SHUTDOWN = "vigilar/system/shutdown"
     SYSTEM_RULES_UPDATED = "vigilar/system/rules_updated"
+    # Web-to-FSM arm/disarm request (FSM verifies the PIN and transitions)
+    SYSTEM_ARM_REQUEST = "vigilar/system/arm_request"
 
     # Wildcard subscriptions
     ALL = "vigilar/#"

vigilar/events/state.py

@@ -1,12 +1,11 @@
 """Arm state finite state machine."""
 
-import hashlib
-import hmac
 import logging
 import time
 
 from sqlalchemy.engine import Engine
 
+from vigilar.alerts.pin import verify_pin
 from vigilar.config import VigilarConfig
 from vigilar.constants import ArmState, EventType, Severity, Topics
 from vigilar.storage.queries import get_current_arm_state, insert_arm_state, insert_event
@@ -19,7 +18,7 @@ class ArmStateFSM:
 
     def __init__(self, engine: Engine, config: VigilarConfig):
         self._engine = engine
-        self._pin_hash = config.system.arm_pin_hash
+        self._pin_hash = config.security.pin_hash
         self._state = ArmState.DISARMED
         self._bus = None
         self._load_initial_state()
@@ -43,12 +42,11 @@ class ArmStateFSM:
         return self._state
 
     def verify_pin(self, pin: str) -> bool:
-        """Verify a PIN against the stored hash using HMAC comparison."""
+        """Verify a PIN against the stored PBKDF2 hash."""
         if not self._pin_hash:
             # No PIN configured — allow all transitions
             return True
-        candidate = hashlib.sha256(pin.encode()).hexdigest()
-        return hmac.compare_digest(candidate, self._pin_hash)
+        return verify_pin(pin, self._pin_hash)
 
     def transition(
         self,
@@ -68,9 +66,10 @@ class ArmStateFSM:
         old_state = self._state
         self._state = new_state
 
-        # Log to database
-        pin_hash = hashlib.sha256(pin.encode()).hexdigest() if pin else None
-        insert_arm_state(self._engine, new_state.value, triggered_by, pin_hash)
+        # pin_hash is always None here: PBKDF2 uses a random salt per call, so
+        # re-hashing the pin now would produce a value unrelated to the stored
+        # hash, making the column useless for audit correlation. See issue #2.
+        insert_arm_state(self._engine, new_state.value, triggered_by, None)
 
         # Log event
         insert_event(