Added a policy option to restrict the default DACL for tokens.

sandbox/win/src/restricted_token_test.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Integration tests for restricted tokens.
+
+#include <stddef.h>
+#include <string>
+
+#include "base/strings/stringprintf.h"
+#include "base/win/scoped_handle.h"
+#include "sandbox/win/src/sandbox.h"
+#include "sandbox/win/src/sandbox_factory.h"
+#include "sandbox/win/src/target_services.h"
+#include "sandbox/win/tests/common/controller.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace sandbox {
+
+namespace {
+
+int RunOpenProcessTest(bool unsandboxed,
+                       bool lockdown_dacl,
+                       DWORD access_mask) {
+  TestRunner runner(JOB_NONE, USER_RESTRICTED_SAME_ACCESS, USER_LOCKDOWN);
+  runner.GetPolicy()->SetDelayedIntegrityLevel(INTEGRITY_LEVEL_UNTRUSTED);
+  runner.GetPolicy()->SetIntegrityLevel(INTEGRITY_LEVEL_LOW);
+  if (lockdown_dacl)
+    runner.GetPolicy()->SetLockdownDefaultDacl();
+  runner.SetAsynchronous(true);
+  // This spins up a renderer level process, we don't care about the result.
+  runner.RunTest(L"IntegrationTestsTest_args 1");
+
+  TestRunner runner2(JOB_NONE, USER_RESTRICTED_SAME_ACCESS, USER_LIMITED);
+  runner2.GetPolicy()->SetDelayedIntegrityLevel(INTEGRITY_LEVEL_LOW);
+  runner2.GetPolicy()->SetIntegrityLevel(INTEGRITY_LEVEL_LOW);
+  runner2.SetUnsandboxed(unsandboxed);
+  return runner2.RunTest(
+      base::StringPrintf(L"RestrictedTokenTest_openprocess %d 0x%08X",
+                         runner.process_id(), access_mask)
+          .c_str());
+}
+
+}  // namespace
+
+// Opens a process based on a PID and access mask passed on the command line.
+// Returns SBOX_TEST_SUCCEEDED if process opened successfully.
+SBOX_TESTS_COMMAND int RestrictedTokenTest_openprocess(int argc,
+                                                       wchar_t** argv) {
+  if (argc < 2)
+    return SBOX_TEST_NOT_FOUND;
+  DWORD pid = _wtoi(argv[0]);
+  if (pid == 0)
+    return SBOX_TEST_NOT_FOUND;
+  DWORD desired_access = wcstoul(argv[1], nullptr, 0);
+  base::win::ScopedHandle process_handle(
+      ::OpenProcess(desired_access, FALSE, pid));
+  if (process_handle.IsValid())
+    return SBOX_TEST_SUCCEEDED;
+
+  return SBOX_TEST_DENIED;
+}
+
+TEST(RestrictedTokenTest, OpenLowPrivilegedProcess) {
+  // Test limited privilege to renderer open.
+  ASSERT_EQ(SBOX_TEST_SUCCEEDED,
+            RunOpenProcessTest(false, false, GENERIC_READ | GENERIC_WRITE));
+  // Test limited privilege to renderer open with lockdowned DACL.
+  ASSERT_EQ(SBOX_TEST_DENIED,
+            RunOpenProcessTest(false, true, GENERIC_READ | GENERIC_WRITE));
+  // Ensure we also can't get any access to the process.
+  ASSERT_EQ(SBOX_TEST_DENIED, RunOpenProcessTest(false, true, MAXIMUM_ALLOWED));
+  // Also check for explicit owner allowed WRITE_DAC right.
+  ASSERT_EQ(SBOX_TEST_DENIED, RunOpenProcessTest(false, true, WRITE_DAC));
+  // Ensure unsandboxed process can still open the renderer for all access.
+  ASSERT_EQ(SBOX_TEST_SUCCEEDED,
+            RunOpenProcessTest(true, true, PROCESS_ALL_ACCESS));
+}
+
+}  // namespace sandbox