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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/safe_browsing/core/browser/hash_realtime_mechanism.h"
#include "base/metrics/histogram_functions.h"
#include "base/task/sequenced_task_runner.h"
#include "components/safe_browsing/core/browser/db/database_manager.h"
#include "components/safe_browsing/core/browser/db/util.h"
#include "components/safe_browsing/core/browser/db/v4_protocol_manager_util.h"
#include "components/safe_browsing/core/browser/safe_browsing_lookup_mechanism.h"
#include "components/safe_browsing/core/common/utils.h"
namespace safe_browsing {
HashRealTimeMechanism::HashRealTimeMechanism(
const GURL& url,
const SBThreatTypeSet& threat_types,
scoped_refptr<SafeBrowsingDatabaseManager> database_manager,
scoped_refptr<base::SequencedTaskRunner> ui_task_runner,
base::WeakPtr<HashRealTimeService> lookup_service_on_ui)
: SafeBrowsingLookupMechanism(url, threat_types, database_manager),
ui_task_runner_(ui_task_runner),
lookup_service_on_ui_(lookup_service_on_ui) {}
HashRealTimeMechanism::~HashRealTimeMechanism() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}
SafeBrowsingLookupMechanism::StartCheckResult
HashRealTimeMechanism::StartCheckInternal() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
database_manager_->CheckUrlForHighConfidenceAllowlist(
url_, base::BindOnce(
&HashRealTimeMechanism::OnCheckUrlForHighConfidenceAllowlist,
weak_factory_.GetWeakPtr()));
return StartCheckResult(
/*is_safe_synchronously=*/false, /*threat_source=*/std::nullopt);
}
void HashRealTimeMechanism::OnCheckUrlForHighConfidenceAllowlist(
bool did_match_allowlist,
std::optional<
SafeBrowsingDatabaseManager::HighConfidenceAllowlistCheckLoggingDetails>
logging_details) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
base::UmaHistogramEnumeration(
"SafeBrowsing.HPRT.LocalMatch.Result",
did_match_allowlist ? AsyncMatch::MATCH : AsyncMatch::NO_MATCH);
if (logging_details) {
base::UmaHistogramBoolean("SafeBrowsing.HPRT.AllStoresAvailable",
logging_details->were_all_stores_available);
base::UmaHistogramBoolean("SafeBrowsing.HPRT.AllowlistSizeTooSmall",
logging_details->was_allowlist_size_too_small);
}
if (did_match_allowlist) {
// If the URL matches the high-confidence allowlist, still do the hash based
// checks.
PerformHashBasedCheck(url_, HashDatabaseFallbackTrigger::kAllowlistMatch);
// NOTE: Calling PerformHashBasedCheck may result in the synchronous
// destruction of this object, so there is nothing safe to do here but
// return.
} else {
ui_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(&HashRealTimeMechanism::StartLookupOnUIThread,
weak_factory_.GetWeakPtr(), url_,
lookup_service_on_ui_,
base::SequencedTaskRunner::GetCurrentDefault()));
}
}
// static
void HashRealTimeMechanism::StartLookupOnUIThread(
base::WeakPtr<HashRealTimeMechanism> weak_ptr_on_io,
const GURL& url,
base::WeakPtr<HashRealTimeService> lookup_service_on_ui,
scoped_refptr<base::SequencedTaskRunner> io_task_runner) {
auto is_lookup_service_found = !!lookup_service_on_ui;
base::UmaHistogramBoolean("SafeBrowsing.HPRT.IsLookupServiceFound",
is_lookup_service_found);
if (!is_lookup_service_found) {
io_task_runner->PostTask(
FROM_HERE,
base::BindOnce(&HashRealTimeMechanism::PerformHashBasedCheck,
weak_ptr_on_io, url,
HashDatabaseFallbackTrigger::kOriginalCheckFailed));
return;
}
HPRTLookupResponseCallback response_callback =
base::BindOnce(&HashRealTimeMechanism::OnLookupResponse, weak_ptr_on_io);
lookup_service_on_ui->StartLookup(url, std::move(response_callback),
std::move(io_task_runner));
}
void HashRealTimeMechanism::OnLookupResponse(
bool is_lookup_successful,
std::optional<SBThreatType> threat_type) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!is_lookup_successful) {
PerformHashBasedCheck(url_,
HashDatabaseFallbackTrigger::kOriginalCheckFailed);
// NOTE: Calling PerformHashBasedCheck may result in the synchronous
// destruction of this object, so there is nothing safe to do here but
// return.
return;
}
DCHECK(threat_type.has_value());
CompleteCheck(std::make_unique<CompleteCheckResult>(
url_, threat_type.value(), ThreatMetadata(),
/*threat_source=*/ThreatSource::NATIVE_PVER5_REAL_TIME,
/*url_real_time_lookup_response=*/nullptr));
// NOTE: Calling CompleteCheck results in the synchronous destruction of this
// object, so there is nothing safe to do here but return.
}
void HashRealTimeMechanism::PerformHashBasedCheck(
const GURL& url,
HashDatabaseFallbackTrigger fallback_trigger) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
hash_database_mechanism_ = std::make_unique<DatabaseManagerMechanism>(
url, threat_types_, database_manager_, CheckBrowseUrlType::kHashDatabase,
/*check_allowlist=*/false);
auto result = hash_database_mechanism_->StartCheck(
base::BindOnce(&HashRealTimeMechanism::OnHashDatabaseCompleteCheckResult,
weak_factory_.GetWeakPtr(), fallback_trigger));
if (result.is_safe_synchronously) {
// No match found in the database, so conclude this is safe.
OnHashDatabaseCompleteCheckResultInternal(
SBThreatType::SB_THREAT_TYPE_SAFE, ThreatMetadata(),
/*threat_source=*/result.threat_source, fallback_trigger);
// NOTE: Calling OnHashDatabaseCompleteCheckResultInternal results in the
// synchronous destruction of this object, so there is nothing safe to do
// here but return.
}
}
void HashRealTimeMechanism::OnHashDatabaseCompleteCheckResult(
HashDatabaseFallbackTrigger fallback_trigger,
std::unique_ptr<SafeBrowsingLookupMechanism::CompleteCheckResult> result) {
OnHashDatabaseCompleteCheckResultInternal(
result->threat_type, result->metadata, result->threat_source,
fallback_trigger);
// NOTE: Calling OnHashDatabaseCompleteCheckResultInternal results in the
// synchronous destruction of this object, so there is nothing safe to do here
// but return.
}
void HashRealTimeMechanism::OnHashDatabaseCompleteCheckResultInternal(
SBThreatType threat_type,
const ThreatMetadata& metadata,
std::optional<ThreatSource> threat_source,
HashDatabaseFallbackTrigger fallback_trigger) {
CHECK(fallback_trigger == HashDatabaseFallbackTrigger::kAllowlistMatch ||
fallback_trigger == HashDatabaseFallbackTrigger::kOriginalCheckFailed);
LogHashDatabaseFallbackResult("HPRT", fallback_trigger, threat_type);
CompleteCheck(std::make_unique<CompleteCheckResult>(
url_, threat_type, metadata, threat_source,
/*url_real_time_lookup_response=*/nullptr));
// NOTE: Calling CompleteCheck results in the synchronous destruction of this
// object, so there is nothing safe to do here but return.
}
} // namespace safe_browsing
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