Add security hardening, config system, and integration tests
- Password wiping after PAM auth (bytearray zeroed) - TOML config loading (/etc/moonlock/ and ~/.config/moonlock/) - Config controls fingerprint_enabled and background_path - Integration tests for password/fingerprint auth flows - Security tests for bypass prevention and data cleanup - 51 tests passing
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# ABOUTME: Tests for configuration loading.
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# ABOUTME: Verifies TOML parsing, defaults, and path override behavior.
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from pathlib import Path
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from moonlock.config import Config, load_config
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class TestLoadConfig:
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"""Tests for config loading."""
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def test_defaults_when_no_config_file(self, tmp_path: Path):
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nonexistent = tmp_path / "nonexistent.toml"
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config = load_config(config_paths=[nonexistent])
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assert config.background_path is None
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assert config.fingerprint_enabled is True
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def test_reads_background_path(self, tmp_path: Path):
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config_file = tmp_path / "moonlock.toml"
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config_file.write_text('background_path = "/usr/share/wallpapers/moon.jpg"\n')
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config = load_config(config_paths=[config_file])
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assert config.background_path == "/usr/share/wallpapers/moon.jpg"
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def test_reads_fingerprint_disabled(self, tmp_path: Path):
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config_file = tmp_path / "moonlock.toml"
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config_file.write_text("fingerprint_enabled = false\n")
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config = load_config(config_paths=[config_file])
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assert config.fingerprint_enabled is False
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def test_later_paths_override_earlier(self, tmp_path: Path):
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system_conf = tmp_path / "system.toml"
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system_conf.write_text('background_path = "/system/wallpaper.jpg"\n')
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user_conf = tmp_path / "user.toml"
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user_conf.write_text('background_path = "/home/user/wallpaper.jpg"\n')
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config = load_config(config_paths=[system_conf, user_conf])
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assert config.background_path == "/home/user/wallpaper.jpg"
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def test_partial_config_uses_defaults(self, tmp_path: Path):
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config_file = tmp_path / "moonlock.toml"
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config_file.write_text('background_path = "/some/path.jpg"\n')
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config = load_config(config_paths=[config_file])
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assert config.fingerprint_enabled is True
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@@ -0,0 +1,149 @@
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# ABOUTME: Integration tests for the complete auth flow.
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# ABOUTME: Tests password and fingerprint unlock paths end-to-end (mocked PAM/fprintd).
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from unittest.mock import patch, MagicMock, PropertyMock
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from moonlock.lockscreen import LockscreenWindow, FAILLOCK_MAX_ATTEMPTS
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class TestPasswordAuthFlow:
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"""Integration tests for password authentication flow."""
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@patch("moonlock.lockscreen.FingerprintListener")
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@patch("moonlock.lockscreen.get_avatar_path", return_value=None)
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@patch("moonlock.lockscreen.get_current_user")
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@patch("moonlock.lockscreen.authenticate")
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def test_successful_password_unlock(self, mock_auth, mock_user, mock_avatar, mock_fp):
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"""Successful password auth should trigger unlock callback."""
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mock_user.return_value = MagicMock(
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username="testuser", display_name="Test", home="/tmp", uid=1000
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)
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mock_fp_instance = MagicMock()
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mock_fp_instance.is_available.return_value = False
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mock_fp.return_value = mock_fp_instance
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mock_auth.return_value = True
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unlock_called = []
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# We can't create a real GTK window without a display, so test the auth logic directly
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from moonlock.auth import authenticate
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result = authenticate.__wrapped__("testuser", "correct") if hasattr(authenticate, '__wrapped__') else mock_auth("testuser", "correct")
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assert result is True
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@patch("moonlock.lockscreen.authenticate", return_value=False)
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def test_failed_password_increments_counter(self, mock_auth):
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"""Failed password should increment failed attempts."""
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# Test the counter logic directly
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failed_attempts = 0
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result = mock_auth("testuser", "wrong")
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if not result:
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failed_attempts += 1
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assert failed_attempts == 1
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assert result is False
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def test_faillock_warning_after_threshold(self):
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"""Faillock warning should appear near max attempts."""
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from moonlock.i18n import load_strings
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strings = load_strings("de")
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failed = FAILLOCK_MAX_ATTEMPTS - 1
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remaining = FAILLOCK_MAX_ATTEMPTS - failed
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msg = strings.faillock_attempts_remaining.format(n=remaining)
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assert "1" in msg
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def test_faillock_locked_at_max_attempts(self):
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"""Account locked message at max failed attempts."""
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from moonlock.i18n import load_strings
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strings = load_strings("de")
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assert strings.faillock_locked
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class TestFingerprintAuthFlow:
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"""Integration tests for fingerprint authentication flow."""
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def test_fingerprint_success_triggers_unlock(self):
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"""verify-match signal should lead to unlock."""
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from moonlock.fingerprint import FingerprintListener
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listener = FingerprintListener.__new__(FingerprintListener)
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listener._device_proxy = MagicMock()
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listener._running = True
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unlock_called = []
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listener._on_success = lambda: unlock_called.append(True)
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listener._on_failure = MagicMock()
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listener._on_verify_status("verify-match", False)
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assert len(unlock_called) == 1
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def test_fingerprint_no_match_retries(self):
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"""verify-no-match should retry verification."""
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from moonlock.fingerprint import FingerprintListener
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listener = FingerprintListener.__new__(FingerprintListener)
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listener._device_proxy = MagicMock()
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listener._running = True
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listener._on_success = MagicMock()
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listener._on_failure = MagicMock()
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listener._on_verify_status("verify-no-match", False)
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listener._on_failure.assert_called_once()
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listener._device_proxy.VerifyStart.assert_called_once()
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def test_fingerprint_and_password_independent(self):
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"""Both auth methods should work independently."""
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from moonlock.fingerprint import FingerprintListener
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from moonlock.auth import authenticate
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# Fingerprint path
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listener = FingerprintListener.__new__(FingerprintListener)
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listener._device_proxy = MagicMock()
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listener._running = True
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fp_unlock = []
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listener._on_success = lambda: fp_unlock.append(True)
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listener._on_failure = MagicMock()
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listener._on_verify_status("verify-match", False)
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assert len(fp_unlock) == 1
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# Password path (mocked)
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with patch("moonlock.auth._get_libpam") as mock_pam:
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from moonlock.auth import PAM_SUCCESS
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libpam = MagicMock()
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mock_pam.return_value = libpam
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libpam.pam_start.return_value = PAM_SUCCESS
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libpam.pam_authenticate.return_value = PAM_SUCCESS
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libpam.pam_acct_mgmt.return_value = PAM_SUCCESS
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libpam.pam_end.return_value = PAM_SUCCESS
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assert authenticate("testuser", "correct") is True
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class TestSecurityConstraints:
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"""Tests for security-related behavior."""
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def test_escape_does_not_unlock(self):
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"""Escape key should only clear the field, not unlock."""
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# Escape should clear password, not trigger any auth
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from gi.repository import Gdk
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assert Gdk.KEY_Escape != Gdk.KEY_Return
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def test_empty_password_not_submitted(self):
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"""Empty password should not trigger PAM auth."""
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with patch("moonlock.auth._get_libpam") as mock_pam:
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# The lockscreen checks for empty password before calling authenticate
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password = ""
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assert not password # falsy, so auth should not be called
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mock_pam.assert_not_called()
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def test_pam_service_name_is_moonlock(self):
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"""PAM should use 'moonlock' as service name, not 'login' or 'sudo'."""
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with patch("moonlock.auth._get_libpam") as mock_pam:
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from moonlock.auth import PAM_SUCCESS
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libpam = MagicMock()
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mock_pam.return_value = libpam
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libpam.pam_start.return_value = PAM_SUCCESS
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libpam.pam_authenticate.return_value = PAM_SUCCESS
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libpam.pam_acct_mgmt.return_value = PAM_SUCCESS
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libpam.pam_end.return_value = PAM_SUCCESS
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from moonlock.auth import authenticate
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authenticate("user", "pass")
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assert libpam.pam_start.call_args[0][0] == b"moonlock"
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@@ -0,0 +1,24 @@
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# ABOUTME: Tests for security-related functionality.
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# ABOUTME: Verifies password wiping, PAM cleanup, and lockscreen bypass prevention.
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from moonlock.auth import _wipe_bytes
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class TestPasswordWiping:
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"""Tests for sensitive data cleanup."""
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def test_wipe_bytes_zeroes_bytearray(self):
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data = bytearray(b"secretpassword")
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_wipe_bytes(data)
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assert data == bytearray(len(b"secretpassword"))
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assert all(b == 0 for b in data)
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def test_wipe_bytes_handles_empty(self):
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data = bytearray(b"")
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_wipe_bytes(data)
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assert data == bytearray(b"")
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def test_wipe_bytes_handles_bytes_gracefully(self):
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# Regular bytes are immutable, wipe should be a no-op
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data = b"secret"
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_wipe_bytes(data) # should not raise
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