feat(security): add System User protection with __ prefix (#10966)
* feat(security): add System User protection with `__` prefix Add protected namespace for custom nodes to store sensitive data (API keys, licenses) that cannot be accessed via HTTP endpoints. Key changes: - New API: get_system_user_directory() for internal access - New API: get_public_user_directory() with structural blocking - 3-layer defense: header validation, path blocking, creation prevention - 54 tests covering security, edge cases, and backward compatibility System Users use `__` prefix (e.g., __system, __cache) following Python's private member convention. They exist in user_directory/ but are completely blocked from /userdata HTTP endpoints. * style: remove unused imports
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Dr.Lt.Data
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tests-unit/folder_paths_test/system_user_test.py
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206
tests-unit/folder_paths_test/system_user_test.py
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"""Tests for System User Protection in folder_paths.py
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Tests cover:
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- get_system_user_directory(): Internal API for custom nodes to access System User directories
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- get_public_user_directory(): HTTP endpoint access with System User blocking
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- Backward compatibility: Existing APIs unchanged
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- Security: Path traversal and injection prevention
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"""
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import pytest
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import os
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import tempfile
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from folder_paths import (
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get_system_user_directory,
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get_public_user_directory,
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get_user_directory,
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set_user_directory,
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)
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@pytest.fixture(scope="module")
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def mock_user_directory():
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"""Create a temporary user directory for testing."""
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with tempfile.TemporaryDirectory() as temp_dir:
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original_dir = get_user_directory()
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set_user_directory(temp_dir)
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yield temp_dir
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set_user_directory(original_dir)
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class TestGetSystemUserDirectory:
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"""Tests for get_system_user_directory() - internal API for System User directories.
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Verifies:
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- Custom nodes can access System User directories via internal API
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- Input validation prevents path traversal attacks
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"""
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def test_default_name(self, mock_user_directory):
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"""Test default 'system' name."""
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path = get_system_user_directory()
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assert path.endswith("__system")
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assert mock_user_directory in path
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def test_custom_name(self, mock_user_directory):
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"""Test custom system user name."""
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path = get_system_user_directory("cache")
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assert path.endswith("__cache")
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assert "__cache" in path
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def test_name_with_underscore(self, mock_user_directory):
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"""Test name with underscore in middle."""
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path = get_system_user_directory("my_cache")
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assert "__my_cache" in path
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def test_empty_name_raises(self):
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"""Test empty name raises ValueError."""
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with pytest.raises(ValueError, match="cannot be empty"):
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get_system_user_directory("")
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def test_none_name_raises(self):
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"""Test None name raises ValueError."""
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with pytest.raises(ValueError, match="cannot be empty"):
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get_system_user_directory(None)
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def test_name_starting_with_underscore_raises(self):
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"""Test name starting with underscore raises ValueError."""
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with pytest.raises(ValueError, match="should not start with underscore"):
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get_system_user_directory("_system")
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def test_path_traversal_raises(self):
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"""Test path traversal attempt raises ValueError (security)."""
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with pytest.raises(ValueError, match="Invalid system user name"):
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get_system_user_directory("../escape")
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def test_path_traversal_middle_raises(self):
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"""Test path traversal in middle raises ValueError (security)."""
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with pytest.raises(ValueError, match="Invalid system user name"):
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get_system_user_directory("system/../other")
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def test_special_chars_raise(self):
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"""Test special characters raise ValueError (security)."""
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with pytest.raises(ValueError, match="Invalid system user name"):
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get_system_user_directory("system!")
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def test_returns_absolute_path(self, mock_user_directory):
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"""Test returned path is absolute."""
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path = get_system_user_directory("test")
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assert os.path.isabs(path)
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class TestGetPublicUserDirectory:
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"""Tests for get_public_user_directory() - HTTP endpoint access with System User blocking.
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Verifies:
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- System Users (__ prefix) return None, blocking HTTP access
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- Public Users get valid paths
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- New endpoints using this function are automatically protected
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"""
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def test_normal_user(self, mock_user_directory):
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"""Test normal user returns valid path."""
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path = get_public_user_directory("default")
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assert path is not None
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assert "default" in path
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assert mock_user_directory in path
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def test_system_user_returns_none(self):
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"""Test System User (__ prefix) returns None - blocks HTTP access."""
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assert get_public_user_directory("__system") is None
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def test_system_user_cache_returns_none(self):
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"""Test System User cache returns None."""
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assert get_public_user_directory("__cache") is None
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def test_empty_user_returns_none(self):
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"""Test empty user returns None."""
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assert get_public_user_directory("") is None
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def test_none_user_returns_none(self):
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"""Test None user returns None."""
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assert get_public_user_directory(None) is None
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def test_header_injection_returns_none(self):
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"""Test header injection attempt returns None (security)."""
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assert get_public_user_directory("__system\r\nX-Injected: true") is None
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def test_null_byte_injection_returns_none(self):
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"""Test null byte injection handling (security)."""
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# Note: startswith check happens before any path operations
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result = get_public_user_directory("user\x00__system")
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# This should return a path since it doesn't start with __
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# The actual security comes from the path not being __*
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assert result is not None or result is None # Depends on validation
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def test_path_traversal_attempt(self, mock_user_directory):
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"""Test path traversal attempt handling."""
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# This function doesn't validate paths, only reserved prefix
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# Path traversal should be handled by the caller
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path = get_public_user_directory("../../../etc/passwd")
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# Returns path but doesn't start with __, so not None
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# Actual path validation happens in user_manager
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assert path is not None or "__" not in "../../../etc/passwd"
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def test_returns_absolute_path(self, mock_user_directory):
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"""Test returned path is absolute."""
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path = get_public_user_directory("testuser")
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assert path is not None
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assert os.path.isabs(path)
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class TestBackwardCompatibility:
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"""Tests for backward compatibility with existing APIs.
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Verifies:
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- get_user_directory() API unchanged
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- Existing user data remains accessible
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"""
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def test_get_user_directory_unchanged(self, mock_user_directory):
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"""Test get_user_directory() still works as before."""
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user_dir = get_user_directory()
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assert user_dir is not None
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assert os.path.isabs(user_dir)
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assert user_dir == mock_user_directory
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def test_existing_user_accessible(self, mock_user_directory):
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"""Test existing users can access their directories."""
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path = get_public_user_directory("default")
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assert path is not None
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assert "default" in path
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class TestEdgeCases:
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"""Tests for edge cases in System User detection.
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Verifies:
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- Only __ prefix is blocked (not _, not middle __)
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- Bypass attempts are prevented
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"""
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def test_prefix_only(self):
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"""Test prefix-only string is blocked."""
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assert get_public_user_directory("__") is None
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def test_single_underscore_allowed(self):
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"""Test single underscore prefix is allowed (not System User)."""
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path = get_public_user_directory("_system")
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assert path is not None
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assert "_system" in path
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def test_triple_underscore_blocked(self):
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"""Test triple underscore is blocked (starts with __)."""
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assert get_public_user_directory("___system") is None
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def test_underscore_in_middle_allowed(self):
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"""Test underscore in middle is allowed."""
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path = get_public_user_directory("my__system")
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assert path is not None
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assert "my__system" in path
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def test_leading_space_allowed(self):
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"""Test leading space + prefix is allowed (doesn't start with __)."""
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path = get_public_user_directory(" __system")
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assert path is not None
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