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https://github.com/google-gemini/gemini-cli.git
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Refactor PolicyEngine to Core Package (#12325)
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
This commit is contained in:
Allen Hutchison
@@ -0,0 +1,644 @@
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/**
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* @license
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* Copyright 2025 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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import { describe, it, expect, vi, afterEach, beforeEach } from 'vitest';
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import nodePath from 'node:path';
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import type { PolicySettings } from './types.js';
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import { ApprovalMode, PolicyDecision } from './types.js';
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import { Storage } from '../config/storage.js';
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afterEach(() => {
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vi.clearAllMocks();
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vi.restoreAllMocks();
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vi.doUnmock('node:fs/promises');
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});
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describe('createPolicyEngineConfig', () => {
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beforeEach(() => {
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// Mock Storage to avoid picking up real user/system policies from the host environment
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vi.spyOn(Storage, 'getUserPoliciesDir').mockReturnValue(
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'/non/existent/user/policies',
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);
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vi.spyOn(Storage, 'getSystemPoliciesDir').mockReturnValue(
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'/non/existent/system/policies',
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);
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});
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it('should return ASK_USER for write tools and ALLOW for read-only tools by default', async () => {
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const actualFs =
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await vi.importActual<typeof import('node:fs/promises')>(
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'node:fs/promises',
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);
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const mockReaddir = vi.fn(
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async (
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path: string | Buffer | URL,
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options?: Parameters<typeof actualFs.readdir>[1],
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) => {
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if (
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typeof path === 'string' &&
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nodePath
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.normalize(path)
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.includes(nodePath.normalize('.gemini/policies'))
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) {
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// Return empty array for user policies
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return [] as unknown as Awaited<ReturnType<typeof actualFs.readdir>>;
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}
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return actualFs.readdir(
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path,
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options as Parameters<typeof actualFs.readdir>[1],
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);
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},
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);
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vi.doMock('node:fs/promises', () => ({
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...actualFs,
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default: { ...actualFs, readdir: mockReaddir },
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readdir: mockReaddir,
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}));
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// Mock Storage to avoid actual filesystem access for policy dirs during tests if needed,
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// but for now relying on the fs mock above might be enough if it catches the right paths.
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// Let's see if we need to mock Storage.getUserPoliciesDir etc.
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vi.resetModules();
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const { createPolicyEngineConfig } = await import('./config.js');
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const settings: PolicySettings = {};
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// Pass a dummy default policies dir to avoid it trying to resolve __dirname relative to the test file in a weird way
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const config = await createPolicyEngineConfig(
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settings,
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ApprovalMode.DEFAULT,
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'/tmp/mock/default/policies',
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);
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expect(config.defaultDecision).toBe(PolicyDecision.ASK_USER);
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// The order of the rules is not guaranteed, so we sort them by tool name.
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config.rules?.sort((a, b) =>
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(a.toolName ?? '').localeCompare(b.toolName ?? ''),
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);
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// Since we are mocking an empty policy directory, we expect NO rules from TOML.
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// Wait, the CLI test expected a bunch of default rules. Those must have come from
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// the actual default policies directory in the CLI package.
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// In the core package, we don't necessarily have those default policy files yet
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// or we need to point to them.
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// For this unit test, if we mock the default dir as empty, we should get NO rules
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// if no settings are provided.
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// Actually, let's look at how CLI test gets them. It uses `__dirname` in `policy.ts`.
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// If we want to test default rules, we need to provide them.
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// For now, let's assert it's empty if we provide no TOML files, to ensure the *mechanism* works.
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// Or better, mock one default rule to ensure it's loaded.
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expect(config.rules).toEqual([]);
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vi.doUnmock('node:fs/promises');
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});
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it('should allow tools in tools.allowed', async () => {
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const { createPolicyEngineConfig } = await import('./config.js');
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const settings: PolicySettings = {
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tools: { allowed: ['run_shell_command'] },
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};
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const config = await createPolicyEngineConfig(
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settings,
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ApprovalMode.DEFAULT,
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'/tmp/mock/default/policies',
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);
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const rule = config.rules?.find(
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(r) =>
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r.toolName === 'run_shell_command' &&
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r.decision === PolicyDecision.ALLOW,
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);
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expect(rule).toBeDefined();
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expect(rule?.priority).toBeCloseTo(2.3, 5); // Command line allow
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});
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it('should deny tools in tools.exclude', async () => {
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const { createPolicyEngineConfig } = await import('./config.js');
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const settings: PolicySettings = {
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tools: { exclude: ['run_shell_command'] },
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};
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const config = await createPolicyEngineConfig(
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settings,
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ApprovalMode.DEFAULT,
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'/tmp/mock/default/policies',
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);
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const rule = config.rules?.find(
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(r) =>
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r.toolName === 'run_shell_command' &&
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r.decision === PolicyDecision.DENY,
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);
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expect(rule).toBeDefined();
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expect(rule?.priority).toBeCloseTo(2.4, 5); // Command line exclude
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});
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it('should allow tools from allowed MCP servers', async () => {
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const { createPolicyEngineConfig } = await import('./config.js');
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const settings: PolicySettings = {
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mcp: { allowed: ['my-server'] },
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};
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const config = await createPolicyEngineConfig(
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settings,
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ApprovalMode.DEFAULT,
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'/tmp/mock/default/policies',
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);
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const rule = config.rules?.find(
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(r) =>
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r.toolName === 'my-server__*' && r.decision === PolicyDecision.ALLOW,
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);
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expect(rule).toBeDefined();
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expect(rule?.priority).toBe(2.1); // MCP allowed server
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});
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it('should deny tools from excluded MCP servers', async () => {
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const { createPolicyEngineConfig } = await import('./config.js');
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const settings: PolicySettings = {
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mcp: { excluded: ['my-server'] },
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};
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const config = await createPolicyEngineConfig(
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settings,
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ApprovalMode.DEFAULT,
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'/tmp/mock/default/policies',
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);
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const rule = config.rules?.find(
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(r) =>
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r.toolName === 'my-server__*' && r.decision === PolicyDecision.DENY,
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);
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expect(rule).toBeDefined();
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expect(rule?.priority).toBe(2.9); // MCP excluded server
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});
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it('should allow tools from trusted MCP servers', async () => {
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const { createPolicyEngineConfig } = await import('./config.js');
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const settings: PolicySettings = {
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mcpServers: {
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'trusted-server': {
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trust: true,
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},
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'untrusted-server': {
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trust: false,
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},
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},
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};
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const config = await createPolicyEngineConfig(
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settings,
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ApprovalMode.DEFAULT,
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'/tmp/mock/default/policies',
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);
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const trustedRule = config.rules?.find(
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(r) =>
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r.toolName === 'trusted-server__*' &&
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r.decision === PolicyDecision.ALLOW,
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);
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expect(trustedRule).toBeDefined();
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expect(trustedRule?.priority).toBe(2.2); // MCP trusted server
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// Untrusted server should not have an allow rule
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const untrustedRule = config.rules?.find(
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(r) =>
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r.toolName === 'untrusted-server__*' &&
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r.decision === PolicyDecision.ALLOW,
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);
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expect(untrustedRule).toBeUndefined();
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});
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it('should handle multiple MCP server configurations together', async () => {
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const { createPolicyEngineConfig } = await import('./config.js');
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const settings: PolicySettings = {
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mcp: {
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allowed: ['allowed-server'],
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excluded: ['excluded-server'],
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},
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mcpServers: {
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'trusted-server': {
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trust: true,
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},
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},
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};
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const config = await createPolicyEngineConfig(
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settings,
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ApprovalMode.DEFAULT,
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'/tmp/mock/default/policies',
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);
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// Check allowed server
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const allowedRule = config.rules?.find(
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(r) =>
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r.toolName === 'allowed-server__*' &&
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r.decision === PolicyDecision.ALLOW,
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);
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expect(allowedRule).toBeDefined();
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expect(allowedRule?.priority).toBe(2.1); // MCP allowed server
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// Check trusted server
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const trustedRule = config.rules?.find(
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(r) =>
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r.toolName === 'trusted-server__*' &&
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r.decision === PolicyDecision.ALLOW,
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);
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expect(trustedRule).toBeDefined();
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expect(trustedRule?.priority).toBe(2.2); // MCP trusted server
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// Check excluded server
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const excludedRule = config.rules?.find(
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(r) =>
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r.toolName === 'excluded-server__*' &&
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r.decision === PolicyDecision.DENY,
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);
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expect(excludedRule).toBeDefined();
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expect(excludedRule?.priority).toBe(2.9); // MCP excluded server
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});
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it('should allow all tools in YOLO mode', async () => {
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const { createPolicyEngineConfig } = await import('./config.js');
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const settings: PolicySettings = {};
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const config = await createPolicyEngineConfig(settings, ApprovalMode.YOLO);
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const rule = config.rules?.find(
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(r) => r.decision === PolicyDecision.ALLOW && !r.toolName,
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);
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expect(rule).toBeDefined();
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// Priority 999 in default tier → 1.999
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expect(rule?.priority).toBeCloseTo(1.999, 5);
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});
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it('should allow edit tool in AUTO_EDIT mode', async () => {
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const { createPolicyEngineConfig } = await import('./config.js');
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const settings: PolicySettings = {};
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const config = await createPolicyEngineConfig(
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settings,
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ApprovalMode.AUTO_EDIT,
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);
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const rule = config.rules?.find(
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(r) => r.toolName === 'replace' && r.decision === PolicyDecision.ALLOW,
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);
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expect(rule).toBeDefined();
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// Priority 15 in default tier → 1.015
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expect(rule?.priority).toBeCloseTo(1.015, 5);
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});
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it('should prioritize exclude over allow', async () => {
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const { createPolicyEngineConfig } = await import('./config.js');
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const settings: PolicySettings = {
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tools: { allowed: ['run_shell_command'], exclude: ['run_shell_command'] },
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};
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const config = await createPolicyEngineConfig(
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settings,
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ApprovalMode.DEFAULT,
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'/tmp/mock/default/policies',
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);
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const denyRule = config.rules?.find(
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(r) =>
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r.toolName === 'run_shell_command' &&
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r.decision === PolicyDecision.DENY,
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);
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const allowRule = config.rules?.find(
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(r) =>
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r.toolName === 'run_shell_command' &&
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r.decision === PolicyDecision.ALLOW,
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);
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expect(denyRule).toBeDefined();
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expect(allowRule).toBeDefined();
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expect(denyRule!.priority).toBeGreaterThan(allowRule!.priority!);
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});
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it('should prioritize specific tool allows over MCP server excludes', async () => {
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const { createPolicyEngineConfig } = await import('./config.js');
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const settings: PolicySettings = {
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mcp: { excluded: ['my-server'] },
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tools: { allowed: ['my-server__specific-tool'] },
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};
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const config = await createPolicyEngineConfig(
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settings,
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ApprovalMode.DEFAULT,
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'/tmp/mock/default/policies',
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);
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const serverDenyRule = config.rules?.find(
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(r) =>
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r.toolName === 'my-server__*' && r.decision === PolicyDecision.DENY,
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);
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const toolAllowRule = config.rules?.find(
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(r) =>
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r.toolName === 'my-server__specific-tool' &&
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r.decision === PolicyDecision.ALLOW,
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);
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expect(serverDenyRule).toBeDefined();
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expect(serverDenyRule?.priority).toBe(2.9); // MCP excluded server
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expect(toolAllowRule).toBeDefined();
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expect(toolAllowRule?.priority).toBeCloseTo(2.3, 5); // Command line allow
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// Server deny (2.9) has higher priority than tool allow (2.3),
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// so server deny wins (this is expected behavior - server-level blocks are security critical)
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});
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it('should handle MCP server allows and tool excludes', async () => {
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const { createPolicyEngineConfig } = await import('./config.js');
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const settings: PolicySettings = {
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mcp: { allowed: ['my-server'] },
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mcpServers: {
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'my-server': {
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trust: true,
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},
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},
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tools: { exclude: ['my-server__dangerous-tool'] },
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};
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const config = await createPolicyEngineConfig(
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settings,
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ApprovalMode.DEFAULT,
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'/tmp/mock/default/policies',
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);
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const serverAllowRule = config.rules?.find(
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(r) =>
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r.toolName === 'my-server__*' && r.decision === PolicyDecision.ALLOW,
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);
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const toolDenyRule = config.rules?.find(
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(r) =>
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r.toolName === 'my-server__dangerous-tool' &&
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r.decision === PolicyDecision.DENY,
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);
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expect(serverAllowRule).toBeDefined();
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expect(toolDenyRule).toBeDefined();
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// Command line exclude (2.4) has higher priority than MCP server trust (2.2)
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// This is the correct behavior - specific exclusions should beat general server trust
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expect(toolDenyRule!.priority).toBeGreaterThan(serverAllowRule!.priority!);
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});
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it('should handle complex priority scenarios correctly', async () => {
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const settings: PolicySettings = {
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tools: {
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allowed: ['my-server__tool1', 'other-tool'], // Priority 2.3
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exclude: ['my-server__tool2', 'glob'], // Priority 2.4
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},
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mcp: {
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allowed: ['allowed-server'], // Priority 2.1
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excluded: ['excluded-server'], // Priority 2.9
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},
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mcpServers: {
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'trusted-server': {
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trust: true, // Priority 90 -> 2.2
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},
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},
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};
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// Mock a default policy for 'glob' to test priority override
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const actualFs =
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await vi.importActual<typeof import('node:fs/promises')>(
|
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'node:fs/promises',
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);
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const mockReaddir = vi.fn(async (p, _o) => {
|
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if (typeof p === 'string' && p.includes('/tmp/mock/default/policies')) {
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return [
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{
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name: 'default.toml',
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isFile: () => true,
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isDirectory: () => false,
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},
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] as unknown as Awaited<ReturnType<typeof actualFs.readdir>>;
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}
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return [];
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});
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const mockReadFile = vi.fn(async (p, _o) => {
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if (typeof p === 'string' && p.includes('default.toml')) {
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return '[[rule]]\ntoolName = "glob"\ndecision = "allow"\npriority = 50\n';
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}
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return '';
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});
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vi.doMock('node:fs/promises', () => ({
|
||||
...actualFs,
|
||||
default: { ...actualFs, readdir: mockReaddir, readFile: mockReadFile },
|
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readdir: mockReaddir,
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readFile: mockReadFile,
|
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}));
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vi.resetModules();
|
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const { createPolicyEngineConfig: createConfig } = await import(
|
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'./config.js'
|
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);
|
||||
|
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const config = await createConfig(
|
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settings,
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ApprovalMode.DEFAULT,
|
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'/tmp/mock/default/policies',
|
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);
|
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|
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// Verify glob is denied even though default would allow it
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const globDenyRule = config.rules?.find(
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(r) => r.toolName === 'glob' && r.decision === PolicyDecision.DENY,
|
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);
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const globAllowRule = config.rules?.find(
|
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(r) => r.toolName === 'glob' && r.decision === PolicyDecision.ALLOW,
|
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);
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expect(globDenyRule).toBeDefined();
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expect(globAllowRule).toBeDefined();
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// Deny from settings (user tier)
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expect(globDenyRule!.priority).toBeCloseTo(2.4, 5); // Command line exclude
|
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// Allow from default TOML: 1 + 50/1000 = 1.05
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expect(globAllowRule!.priority).toBeCloseTo(1.05, 5);
|
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|
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// Verify all priority levels are correct
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const priorities = config.rules
|
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?.map((r) => ({
|
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tool: r.toolName,
|
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decision: r.decision,
|
||||
priority: r.priority,
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||||
}))
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.sort((a, b) => (b.priority ?? 0) - (a.priority ?? 0));
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// Check that the highest priority items are the excludes (user tier: 2.4 and 2.9)
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const highestPriorityExcludes = priorities?.filter(
|
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(p) =>
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Math.abs(p.priority! - 2.4) < 0.01 ||
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Math.abs(p.priority! - 2.9) < 0.01,
|
||||
);
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expect(
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||||
highestPriorityExcludes?.every((p) => p.decision === PolicyDecision.DENY),
|
||||
).toBe(true);
|
||||
|
||||
vi.doUnmock('node:fs/promises');
|
||||
});
|
||||
|
||||
it('should handle MCP servers with undefined trust property', async () => {
|
||||
const { createPolicyEngineConfig } = await import('./config.js');
|
||||
const settings: PolicySettings = {
|
||||
mcpServers: {
|
||||
'no-trust-property': {
|
||||
// trust property is undefined/missing
|
||||
},
|
||||
'explicit-false': {
|
||||
trust: false,
|
||||
},
|
||||
},
|
||||
};
|
||||
const config = await createPolicyEngineConfig(
|
||||
settings,
|
||||
ApprovalMode.DEFAULT,
|
||||
'/tmp/mock/default/policies',
|
||||
);
|
||||
|
||||
// Neither server should have an allow rule
|
||||
const noTrustRule = config.rules?.find(
|
||||
(r) =>
|
||||
r.toolName === 'no-trust-property__*' &&
|
||||
r.decision === PolicyDecision.ALLOW,
|
||||
);
|
||||
const explicitFalseRule = config.rules?.find(
|
||||
(r) =>
|
||||
r.toolName === 'explicit-false__*' &&
|
||||
r.decision === PolicyDecision.ALLOW,
|
||||
);
|
||||
|
||||
expect(noTrustRule).toBeUndefined();
|
||||
expect(explicitFalseRule).toBeUndefined();
|
||||
});
|
||||
|
||||
it('should have YOLO allow-all rule beat write tool rules in YOLO mode', async () => {
|
||||
vi.resetModules();
|
||||
vi.doUnmock('node:fs/promises');
|
||||
const { createPolicyEngineConfig: createConfig } = await import(
|
||||
'./config.js'
|
||||
);
|
||||
// Re-mock Storage after resetModules because it was reloaded
|
||||
const { Storage: FreshStorage } = await import('../config/storage.js');
|
||||
vi.spyOn(FreshStorage, 'getUserPoliciesDir').mockReturnValue(
|
||||
'/non/existent/user/policies',
|
||||
);
|
||||
vi.spyOn(FreshStorage, 'getSystemPoliciesDir').mockReturnValue(
|
||||
'/non/existent/system/policies',
|
||||
);
|
||||
|
||||
const settings: PolicySettings = {
|
||||
tools: { exclude: ['dangerous-tool'] },
|
||||
};
|
||||
// Use default policy dir (no third arg) to load real yolo.toml and write.toml
|
||||
const config = await createConfig(settings, ApprovalMode.YOLO);
|
||||
|
||||
// Should have the wildcard allow rule
|
||||
const wildcardRule = config.rules?.find(
|
||||
(r) => !r.toolName && r.decision === PolicyDecision.ALLOW,
|
||||
);
|
||||
expect(wildcardRule).toBeDefined();
|
||||
// Priority 999 in default tier → 1.999
|
||||
expect(wildcardRule?.priority).toBeCloseTo(1.999, 5);
|
||||
|
||||
// Write tool ASK_USER rules are present (from write.toml)
|
||||
const writeToolRules = config.rules?.filter(
|
||||
(r) =>
|
||||
['run_shell_command'].includes(r.toolName || '') &&
|
||||
r.decision === PolicyDecision.ASK_USER,
|
||||
);
|
||||
expect(writeToolRules).toBeDefined();
|
||||
expect(writeToolRules?.length).toBeGreaterThan(0);
|
||||
|
||||
// But YOLO allow-all rule has higher priority than all write tool rules
|
||||
writeToolRules?.forEach((writeRule) => {
|
||||
expect(wildcardRule!.priority).toBeGreaterThan(writeRule.priority!);
|
||||
});
|
||||
|
||||
// Should still have the exclude rule (from settings, user tier)
|
||||
const excludeRule = config.rules?.find(
|
||||
(r) =>
|
||||
r.toolName === 'dangerous-tool' && r.decision === PolicyDecision.DENY,
|
||||
);
|
||||
expect(excludeRule).toBeDefined();
|
||||
expect(excludeRule?.priority).toBeCloseTo(2.4, 5); // Command line exclude
|
||||
});
|
||||
|
||||
it('should support argsPattern in policy rules', async () => {
|
||||
const actualFs =
|
||||
await vi.importActual<typeof import('node:fs/promises')>(
|
||||
'node:fs/promises',
|
||||
);
|
||||
|
||||
const mockReaddir = vi.fn(
|
||||
async (
|
||||
path: string | Buffer | URL,
|
||||
options?: Parameters<typeof actualFs.readdir>[1],
|
||||
) => {
|
||||
if (
|
||||
typeof path === 'string' &&
|
||||
nodePath
|
||||
.normalize(path)
|
||||
.includes(nodePath.normalize('.gemini/policies'))
|
||||
) {
|
||||
return [
|
||||
{
|
||||
name: 'write.toml',
|
||||
isFile: () => true,
|
||||
isDirectory: () => false,
|
||||
},
|
||||
] as unknown as Awaited<ReturnType<typeof actualFs.readdir>>;
|
||||
}
|
||||
return actualFs.readdir(
|
||||
path,
|
||||
options as Parameters<typeof actualFs.readdir>[1],
|
||||
);
|
||||
},
|
||||
);
|
||||
|
||||
const mockReadFile = vi.fn(
|
||||
async (
|
||||
path: Parameters<typeof actualFs.readFile>[0],
|
||||
options: Parameters<typeof actualFs.readFile>[1],
|
||||
) => {
|
||||
if (
|
||||
typeof path === 'string' &&
|
||||
nodePath
|
||||
.normalize(path)
|
||||
.includes(nodePath.normalize('.gemini/policies/write.toml'))
|
||||
) {
|
||||
return `
|
||||
[[rule]]
|
||||
toolName = "run_shell_command"
|
||||
argsPattern = "\\"command\\":\\"git (status|diff|log)\\""
|
||||
decision = "allow"
|
||||
priority = 150
|
||||
`;
|
||||
}
|
||||
return actualFs.readFile(path, options);
|
||||
},
|
||||
);
|
||||
|
||||
vi.doMock('node:fs/promises', () => ({
|
||||
...actualFs,
|
||||
default: { ...actualFs, readFile: mockReadFile, readdir: mockReaddir },
|
||||
readFile: mockReadFile,
|
||||
readdir: mockReaddir,
|
||||
}));
|
||||
|
||||
vi.resetModules();
|
||||
const { createPolicyEngineConfig } = await import('./config.js');
|
||||
|
||||
const settings: PolicySettings = {};
|
||||
const config = await createPolicyEngineConfig(
|
||||
settings,
|
||||
ApprovalMode.DEFAULT,
|
||||
'/tmp/mock/default/policies',
|
||||
);
|
||||
|
||||
const rule = config.rules?.find(
|
||||
(r) =>
|
||||
r.toolName === 'run_shell_command' &&
|
||||
r.decision === PolicyDecision.ALLOW,
|
||||
);
|
||||
expect(rule).toBeDefined();
|
||||
// Priority 150 in user tier → 2.150
|
||||
expect(rule?.priority).toBeCloseTo(2.15, 5);
|
||||
expect(rule?.argsPattern).toBeInstanceOf(RegExp);
|
||||
expect(rule?.argsPattern?.test('{"command":"git status"}')).toBe(true);
|
||||
expect(rule?.argsPattern?.test('{"command":"git diff"}')).toBe(true);
|
||||
expect(rule?.argsPattern?.test('{"command":"git log"}')).toBe(true);
|
||||
expect(rule?.argsPattern?.test('{"command":"git commit"}')).toBe(false);
|
||||
expect(rule?.argsPattern?.test('{"command":"git push"}')).toBe(false);
|
||||
|
||||
vi.doUnmock('node:fs/promises');
|
||||
});
|
||||
});
|
||||
Reference in New Issue
Block a user