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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/extensions/safe_browsing_verdict_handler.h"
#include "chrome/browser/extensions/extension_service.h"
#include "chrome/browser/extensions/extension_service_test_base.h"
#include "chrome/browser/extensions/test_blocklist.h"
#include "chrome/browser/profiles/profile.h"
#include "components/safe_browsing/buildflags.h"
#include "extensions/browser/blocklist_extension_prefs.h"
#include "extensions/browser/blocklist_state.h"
#include "extensions/browser/extension_registrar.h"
#include "extensions/test/extension_state_tester.h"
// The blocklist tests rely on the safe-browsing database.
#if BUILDFLAG(SAFE_BROWSING_DB_LOCAL)
#define ENABLE_BLOCKLIST_TESTS
#endif
namespace extensions {
namespace {
// Extension ids used during testing.
constexpr char kGood0[] = "behllobkkfkfnphdnhnkndlbkcpglgmj";
constexpr char kGood1[] = "hpiknbiabeeppbpihjehijgoemciehgk";
constexpr char kGood2[] = "bjafgdebaacbbbecmhlhpofkepfkgcpa";
} // namespace
// Test suite to test safe browsing verdict handler.
class SafeBrowsingVerdictHandlerUnitTest : public ExtensionServiceTestBase {
protected:
void SetBlocklistStateForExtension(const std::string& extension_id,
BlocklistState state,
TestBlocklist& test_blocklist) {
// Reset cache in blocklist to make sure the latest blocklist state is
// fetched.
service()->blocklist_->ResetBlocklistStateCacheForTest();
test_blocklist.SetBlocklistState(extension_id, state, true);
task_environment()->RunUntilIdle();
}
};
#if defined(ENABLE_BLOCKLIST_TESTS)
// Extension is added to blocklist with BLOCKLISTED_POTENTIALLY_UNWANTED state
// after it is installed. It is then successfully re-enabled by the user.
TEST_F(SafeBrowsingVerdictHandlerUnitTest, GreylistedExtensionDisabled) {
TestBlocklist test_blocklist;
// A profile with 3 extensions installed: kGood0, kGood1, and kGood2.
InitializeGoodInstalledExtensionService();
test_blocklist.Attach(service()->blocklist_);
service()->Init();
ExtensionStateTester state_tester(profile());
EXPECT_TRUE(state_tester.ExpectEnabled(kGood0));
EXPECT_TRUE(state_tester.ExpectEnabled(kGood1));
EXPECT_TRUE(state_tester.ExpectEnabled(kGood2));
// Add kGood0 and kGood1 (and an invalid extension ID) to greylist.
test_blocklist.SetBlocklistState(kGood0, BLOCKLISTED_CWS_POLICY_VIOLATION,
true);
test_blocklist.SetBlocklistState(kGood1, BLOCKLISTED_POTENTIALLY_UNWANTED,
true);
test_blocklist.SetBlocklistState("invalid_id", BLOCKLISTED_MALWARE, true);
task_environment()->RunUntilIdle();
EXPECT_TRUE(state_tester.ExpectDisabledWithSingleReason(
kGood0, disable_reason::DISABLE_GREYLIST));
EXPECT_TRUE(state_tester.ExpectDisabledWithSingleReason(
kGood1, disable_reason::DISABLE_GREYLIST));
EXPECT_TRUE(state_tester.ExpectEnabled(kGood2));
ValidateIntegerPref(kGood0, "blacklist_state",
BLOCKLISTED_CWS_POLICY_VIOLATION);
ValidateIntegerPref(kGood1, "blacklist_state",
BLOCKLISTED_POTENTIALLY_UNWANTED);
// Now user enables kGood0.
registrar()->EnableExtension(kGood0);
EXPECT_TRUE(state_tester.ExpectEnabled(kGood0));
EXPECT_TRUE(state_tester.ExpectDisabledWithSingleReason(
kGood1, disable_reason::DISABLE_GREYLIST));
EXPECT_TRUE(state_tester.ExpectEnabled(kGood2));
// Remove extensions from blocklist.
test_blocklist.SetBlocklistState(kGood0, NOT_BLOCKLISTED, true);
test_blocklist.SetBlocklistState(kGood1, NOT_BLOCKLISTED, true);
task_environment()->RunUntilIdle();
// All extensions are enabled.
EXPECT_TRUE(state_tester.ExpectEnabled(kGood0));
EXPECT_TRUE(state_tester.ExpectEnabled(kGood1));
EXPECT_TRUE(state_tester.ExpectEnabled(kGood2));
}
// When extension is removed from greylist, do not re-enable it if it is
// disabled by user.
TEST_F(SafeBrowsingVerdictHandlerUnitTest, GreylistDontEnableManuallyDisabled) {
TestBlocklist test_blocklist;
// A profile with 3 extensions installed: kGood0, kGood1, and kGood2.
InitializeGoodInstalledExtensionService();
test_blocklist.Attach(service()->blocklist_);
service()->Init();
// Manually disable.
registrar()->DisableExtension(kGood0, {disable_reason::DISABLE_USER_ACTION});
test_blocklist.SetBlocklistState(kGood0, BLOCKLISTED_CWS_POLICY_VIOLATION,
true);
test_blocklist.SetBlocklistState(kGood1, BLOCKLISTED_POTENTIALLY_UNWANTED,
true);
test_blocklist.SetBlocklistState(kGood2, BLOCKLISTED_SECURITY_VULNERABILITY,
true);
task_environment()->RunUntilIdle();
ExtensionStateTester state_tester(profile());
// All extensions disabled.
EXPECT_TRUE(state_tester.ExpectDisabledWithReasons(
kGood0,
{disable_reason::DISABLE_GREYLIST, disable_reason::DISABLE_USER_ACTION}));
EXPECT_TRUE(state_tester.ExpectDisabledWithSingleReason(
kGood1, disable_reason::DISABLE_GREYLIST));
EXPECT_TRUE(state_tester.ExpectDisabledWithSingleReason(
kGood2, disable_reason::DISABLE_GREYLIST));
// Greylisted extension can be enabled.
registrar()->EnableExtension(kGood1);
EXPECT_TRUE(state_tester.ExpectEnabled(kGood1));
// kGood1 is now manually disabled.
registrar()->DisableExtension(kGood1, {disable_reason::DISABLE_USER_ACTION});
EXPECT_TRUE(state_tester.ExpectDisabledWithSingleReason(
kGood1, disable_reason::DISABLE_USER_ACTION));
// Remove extensions from blocklist.
test_blocklist.SetBlocklistState(kGood0, NOT_BLOCKLISTED, true);
test_blocklist.SetBlocklistState(kGood1, NOT_BLOCKLISTED, true);
test_blocklist.SetBlocklistState(kGood2, NOT_BLOCKLISTED, true);
task_environment()->RunUntilIdle();
// kGood0 and kGood1 remain disabled.
EXPECT_TRUE(state_tester.ExpectDisabledWithSingleReason(
kGood0, disable_reason::DISABLE_USER_ACTION));
EXPECT_TRUE(state_tester.ExpectDisabledWithSingleReason(
kGood1, disable_reason::DISABLE_USER_ACTION));
EXPECT_TRUE(state_tester.ExpectEnabled(kGood2));
}
// Greylisted extension with unknown state are not enabled/disabled.
TEST_F(SafeBrowsingVerdictHandlerUnitTest, GreylistUnknownDontChange) {
TestBlocklist test_blocklist;
// A profile with 3 extensions installed: kGood0, kGood1, and kGood2.
InitializeGoodInstalledExtensionService();
test_blocklist.Attach(service()->blocklist_);
service()->Init();
test_blocklist.SetBlocklistState(kGood0, BLOCKLISTED_CWS_POLICY_VIOLATION,
true);
test_blocklist.SetBlocklistState(kGood1, BLOCKLISTED_POTENTIALLY_UNWANTED,
true);
task_environment()->RunUntilIdle();
ExtensionStateTester state_tester(profile());
EXPECT_TRUE(state_tester.ExpectDisabledWithSingleReason(
kGood0, disable_reason::DISABLE_GREYLIST));
EXPECT_TRUE(state_tester.ExpectDisabledWithSingleReason(
kGood1, disable_reason::DISABLE_GREYLIST));
EXPECT_TRUE(state_tester.ExpectEnabled(kGood2));
test_blocklist.SetBlocklistState(kGood0, NOT_BLOCKLISTED, true);
test_blocklist.SetBlocklistState(kGood1, BLOCKLISTED_UNKNOWN, true);
test_blocklist.SetBlocklistState(kGood2, BLOCKLISTED_UNKNOWN, true);
task_environment()->RunUntilIdle();
// kGood0 re-enabled, other remain as they were.
EXPECT_TRUE(state_tester.ExpectEnabled(kGood0));
EXPECT_TRUE(state_tester.ExpectDisabledWithSingleReason(
kGood1, disable_reason::DISABLE_GREYLIST));
EXPECT_TRUE(state_tester.ExpectEnabled(kGood2));
}
// The extension is loaded but kept disabled when it is downgraded from
// blocklist to greylist.
TEST_F(SafeBrowsingVerdictHandlerUnitTest,
UnblocklistedExtensionStillGreylisted) {
TestBlocklist test_blocklist;
// A profile with 3 extensions installed: kGood0, kGood1, and kGood2.
InitializeGoodInstalledExtensionService();
test_blocklist.Attach(service()->blocklist_);
service()->Init();
// Add the extension to blocklist
SetBlocklistStateForExtension(kGood0, BLOCKLISTED_MALWARE, test_blocklist);
ExtensionStateTester state_tester(profile());
EXPECT_TRUE(state_tester.ExpectBlocklisted(kGood0));
// Remove the extension from blocklist and add it to greylist
SetBlocklistStateForExtension(kGood0, BLOCKLISTED_CWS_POLICY_VIOLATION,
test_blocklist);
content::RunAllTasksUntilIdle();
// The extension is reloaded, but remains disabled.
EXPECT_TRUE(state_tester.ExpectDisabledWithSingleReason(
kGood0, disable_reason::DISABLE_GREYLIST));
}
// When extension is on the greylist, do not disable it if it is re-enabled by
// user.
TEST_F(SafeBrowsingVerdictHandlerUnitTest,
GreylistedExtensionDoesNotDisableAgain) {
TestBlocklist test_blocklist;
// A profile with 3 extensions installed: kGood0, kGood1, and kGood2.
InitializeGoodInstalledExtensionService();
test_blocklist.Attach(service()->blocklist_);
service()->Init();
ExtensionPrefs* extension_prefs = ExtensionPrefs::Get(profile());
SetBlocklistStateForExtension(kGood0, BLOCKLISTED_CWS_POLICY_VIOLATION,
test_blocklist);
ExtensionStateTester state_tester(profile());
EXPECT_TRUE(state_tester.ExpectDisabledWithSingleReason(
kGood0, disable_reason::DISABLE_GREYLIST));
EXPECT_TRUE(blocklist_prefs::HasAcknowledgedBlocklistState(
kGood0, BitMapBlocklistState::BLOCKLISTED_CWS_POLICY_VIOLATION,
extension_prefs));
// Now user enables kGood0.
registrar()->EnableExtension(kGood0);
EXPECT_TRUE(state_tester.ExpectEnabled(kGood0));
// The acknowledged state should not be cleared when the extension is
// re-enabled.
EXPECT_TRUE(blocklist_prefs::HasAcknowledgedBlocklistState(
kGood0, BitMapBlocklistState::BLOCKLISTED_CWS_POLICY_VIOLATION,
extension_prefs));
// Set the blocklist to the same greylist state.
SetBlocklistStateForExtension(kGood0, BLOCKLISTED_CWS_POLICY_VIOLATION,
test_blocklist);
// kGood0 should still be enabled.
EXPECT_TRUE(state_tester.ExpectEnabled(kGood0));
// The acknowledged state should not be cleared.
EXPECT_TRUE(blocklist_prefs::HasAcknowledgedBlocklistState(
kGood0, BitMapBlocklistState::BLOCKLISTED_CWS_POLICY_VIOLATION,
extension_prefs));
}
// When extension is removed from the greylist and re-added, disable the
// extension again.
TEST_F(SafeBrowsingVerdictHandlerUnitTest,
GreylistedExtensionDisableAgainIfReAdded) {
TestBlocklist test_blocklist;
// A profile with 3 extensions installed: kGood0, kGood1, and kGood2.
InitializeGoodInstalledExtensionService();
test_blocklist.Attach(service()->blocklist_);
service()->Init();
ExtensionPrefs* extension_prefs = ExtensionPrefs::Get(profile());
SetBlocklistStateForExtension(kGood0, BLOCKLISTED_CWS_POLICY_VIOLATION,
test_blocklist);
ExtensionStateTester state_tester(profile());
// kGood0 is disabled.
EXPECT_TRUE(state_tester.ExpectDisabledWithSingleReason(
kGood0, disable_reason::DISABLE_GREYLIST));
EXPECT_TRUE(blocklist_prefs::HasAcknowledgedBlocklistState(
kGood0, BitMapBlocklistState::BLOCKLISTED_CWS_POLICY_VIOLATION,
extension_prefs));
// Now user enables kGood0.
registrar()->EnableExtension(kGood0);
EXPECT_TRUE(state_tester.ExpectEnabled(kGood0));
// The acknowledged state should not be cleared when the extension is
// re-enabled.
EXPECT_TRUE(blocklist_prefs::HasAcknowledgedBlocklistState(
kGood0, BitMapBlocklistState::BLOCKLISTED_CWS_POLICY_VIOLATION,
extension_prefs));
// Remove kGood0 from blocklist.
SetBlocklistStateForExtension(kGood0, NOT_BLOCKLISTED, test_blocklist);
// kGood0 should still be enabled.
EXPECT_TRUE(state_tester.ExpectEnabled(kGood0));
// The acknowledged state should be cleared when the extension is removed from
// the blocklist.
EXPECT_FALSE(blocklist_prefs::HasAcknowledgedBlocklistState(
kGood0, BitMapBlocklistState::BLOCKLISTED_CWS_POLICY_VIOLATION,
extension_prefs));
// Set the blocklist to the same greylist state.
SetBlocklistStateForExtension(kGood0, BLOCKLISTED_CWS_POLICY_VIOLATION,
test_blocklist);
// kGood0 is disabled again.
EXPECT_TRUE(state_tester.ExpectDisabledWithSingleReason(
kGood0, disable_reason::DISABLE_GREYLIST));
// The acknowledged state should be set again.
EXPECT_TRUE(blocklist_prefs::HasAcknowledgedBlocklistState(
kGood0, BitMapBlocklistState::BLOCKLISTED_CWS_POLICY_VIOLATION,
extension_prefs));
}
// When extension is on the greylist, disable it again if the greylist state
// changes, even if the user has re-enabled it.
TEST_F(SafeBrowsingVerdictHandlerUnitTest,
DisableExtensionForDifferentGreylistState) {
TestBlocklist test_blocklist;
// A profile with 3 extensions installed: kGood0, kGood1, and kGood2.
InitializeGoodInstalledExtensionService();
test_blocklist.Attach(service()->blocklist_);
service()->Init();
ExtensionPrefs* extension_prefs = ExtensionPrefs::Get(profile());
SetBlocklistStateForExtension(kGood0, BLOCKLISTED_CWS_POLICY_VIOLATION,
test_blocklist);
ExtensionStateTester state_tester(profile());
// kGood0 is disabled.
EXPECT_TRUE(state_tester.ExpectDisabledWithSingleReason(
kGood0, disable_reason::DISABLE_GREYLIST));
EXPECT_TRUE(blocklist_prefs::HasAcknowledgedBlocklistState(
kGood0, BitMapBlocklistState::BLOCKLISTED_CWS_POLICY_VIOLATION,
extension_prefs));
// Now user enables kGood0.
registrar()->EnableExtension(kGood0);
EXPECT_TRUE(state_tester.ExpectEnabled(kGood0));
// Set the blocklist to another greylist state.
SetBlocklistStateForExtension(kGood0, BLOCKLISTED_POTENTIALLY_UNWANTED,
test_blocklist);
// The extension should be disabled again.
EXPECT_TRUE(state_tester.ExpectDisabledWithSingleReason(
kGood0, disable_reason::DISABLE_GREYLIST));
// The old acknowledged state should be cleared and the new one should be set.
EXPECT_FALSE(blocklist_prefs::HasAcknowledgedBlocklistState(
kGood0, BitMapBlocklistState::BLOCKLISTED_CWS_POLICY_VIOLATION,
extension_prefs));
EXPECT_TRUE(blocklist_prefs::HasAcknowledgedBlocklistState(
kGood0, BitMapBlocklistState::BLOCKLISTED_POTENTIALLY_UNWANTED,
extension_prefs));
}
// Add the extension to greylist state1, and then switch to greylist state2, and
// then the user re-enables the extension, and then the extension is switched
// back to greylist state1, the extension should be disabled again.
TEST_F(SafeBrowsingVerdictHandlerUnitTest,
DisableExtensionWhenSwitchingBetweenGreylistStates) {
TestBlocklist test_blocklist;
// A profile with 3 extensions installed: kGood0, kGood1, and kGood2.
InitializeGoodInstalledExtensionService();
test_blocklist.Attach(service()->blocklist_);
service()->Init();
ExtensionPrefs* extension_prefs = ExtensionPrefs::Get(profile());
SetBlocklistStateForExtension(kGood0, BLOCKLISTED_CWS_POLICY_VIOLATION,
test_blocklist);
// Set the blocklist to another greylist state.
SetBlocklistStateForExtension(kGood0, BLOCKLISTED_POTENTIALLY_UNWANTED,
test_blocklist);
ExtensionStateTester state_tester(profile());
// kGood0 is disabled.
EXPECT_TRUE(state_tester.ExpectDisabledWithSingleReason(
kGood0, disable_reason::DISABLE_GREYLIST));
EXPECT_FALSE(blocklist_prefs::HasAcknowledgedBlocklistState(
kGood0, BitMapBlocklistState::BLOCKLISTED_CWS_POLICY_VIOLATION,
extension_prefs));
EXPECT_TRUE(blocklist_prefs::HasAcknowledgedBlocklistState(
kGood0, BitMapBlocklistState::BLOCKLISTED_POTENTIALLY_UNWANTED,
extension_prefs));
// Now user enables kGood0.
registrar()->EnableExtension(kGood0);
EXPECT_TRUE(state_tester.ExpectEnabled(kGood0));
// Set the blocklist to the original blocklist state.
SetBlocklistStateForExtension(kGood0, BLOCKLISTED_CWS_POLICY_VIOLATION,
test_blocklist);
// The extension should be disabled again.
EXPECT_TRUE(state_tester.ExpectDisabledWithSingleReason(
kGood0, disable_reason::DISABLE_GREYLIST));
// The acknowledged state should be set to the current state.
EXPECT_TRUE(blocklist_prefs::HasAcknowledgedBlocklistState(
kGood0, BitMapBlocklistState::BLOCKLISTED_CWS_POLICY_VIOLATION,
extension_prefs));
EXPECT_FALSE(blocklist_prefs::HasAcknowledgedBlocklistState(
kGood0, BitMapBlocklistState::BLOCKLISTED_POTENTIALLY_UNWANTED,
extension_prefs));
}
// Old greylisted extensions are not re-enabled.
// This test is for checking backward compatibility.
TEST_F(SafeBrowsingVerdictHandlerUnitTest, AcknowledgedStateBackFilled) {
TestBlocklist test_blocklist;
// A profile with 3 extensions installed: kGood0, kGood1, and kGood2.
InitializeGoodInstalledExtensionService();
test_blocklist.Attach(service()->blocklist_);
service()->Init();
ExtensionPrefs* extension_prefs = ExtensionPrefs::Get(profile());
SetBlocklistStateForExtension(kGood0, BLOCKLISTED_CWS_POLICY_VIOLATION,
test_blocklist);
ExtensionStateTester state_tester(profile());
// kGood0 is disabled.
EXPECT_TRUE(state_tester.ExpectDisabledWithSingleReason(
kGood0, disable_reason::DISABLE_GREYLIST));
// Now user enables kGood0.
registrar()->EnableExtension(kGood0);
EXPECT_TRUE(state_tester.ExpectEnabled(kGood0));
// To simulate an old Chrome version, the acknowledged state is cleared.
blocklist_prefs::ClearAcknowledgedGreylistStates(
kGood0, ExtensionPrefs::Get(profile()));
// The browser is restarted.
service()->safe_browsing_verdict_handler_.Init();
// The acknowledged state should be restored.
EXPECT_TRUE(blocklist_prefs::HasAcknowledgedBlocklistState(
kGood0, BitMapBlocklistState::BLOCKLISTED_CWS_POLICY_VIOLATION,
extension_prefs));
// Set the blocklist to the same greylist state.
SetBlocklistStateForExtension(kGood0, BLOCKLISTED_CWS_POLICY_VIOLATION,
test_blocklist);
// kGood0 should remain enabled.
EXPECT_TRUE(state_tester.ExpectEnabled(kGood0));
}
// Regression test for https://crbug.com/1267860. It should not crash if the
// extension is uninstalled before it is removed from the blocklist.
TEST_F(SafeBrowsingVerdictHandlerUnitTest,
ExtensionUninstalledWhenBlocklisted) {
TestBlocklist test_blocklist;
// A profile with 3 extensions installed: kGood0, kGood1, and kGood2.
InitializeGoodInstalledExtensionService();
test_blocklist.Attach(service()->blocklist_);
service()->Init();
SetBlocklistStateForExtension(kGood0, BLOCKLISTED_MALWARE, test_blocklist);
ExtensionStateTester state_tester(profile());
// kGood0 is blocklisted.
EXPECT_TRUE(state_tester.ExpectBlocklisted(kGood0));
// Now uninstall kGood0.
registrar()->UninstallExtension(kGood0, UNINSTALL_REASON_FOR_TESTING,
nullptr);
// kGood0 should be removed from the blocklist.
EXPECT_EQ(0u, registry()->blocklisted_extensions().size());
// Should not crash.
SetBlocklistStateForExtension(kGood0, NOT_BLOCKLISTED, test_blocklist);
}
// Regression test for https://crbug.com/1267860. It should not crash if the
// extension is uninstalled during blocklist fetching.
TEST_F(SafeBrowsingVerdictHandlerUnitTest,
ExtensionUninstalledWhenBlocklistFetching) {
TestBlocklist test_blocklist;
// A profile with 3 extensions installed: kGood0, kGood1, and kGood2.
InitializeGoodInstalledExtensionService();
test_blocklist.Attach(service()->blocklist_);
service()->Init();
SetBlocklistStateForExtension(kGood0, BLOCKLISTED_MALWARE, test_blocklist);
ExtensionStateTester state_tester(profile());
// kGood0 is blocklisted.
EXPECT_TRUE(state_tester.ExpectBlocklisted(kGood0));
service()->blocklist_->ResetBlocklistStateCacheForTest();
// Use TestBlocklist::SetBlocklistState() here instead of
// SetBlocklistStateForExtension(). This makes the blocklisting process
// asynchronous, so that we can simulate uninstalling the extension
// during a blocklist state fetch.
test_blocklist.SetBlocklistState(kGood0, BLOCKLISTED_MALWARE, true);
// Uninstalled the extension in the middle of the update.
registrar()->UninstallExtension(kGood0, UNINSTALL_REASON_FOR_TESTING,
nullptr);
// Should not crash when the update finishes.
task_environment()->RunUntilIdle();
}
#endif // defined(ENABLE_BLOCKLIST_TESTS)
} // namespace extensions
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