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// Copyright 2015 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.
#include "components/safe_browsing_db/remote_database_manager.h"
#include <vector>
#include "base/metrics/histogram_macros.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/timer/elapsed_timer.h"
#include "components/safe_browsing_db/safe_browsing_api_handler.h"
#include "components/safe_browsing_db/v4_get_hash_protocol_manager.h"
#include "components/variations/variations_associated_data.h"
#include "content/public/browser/browser_thread.h"
using content::BrowserThread;
namespace {
// Android field trial for controlling types_to_check.
const char kAndroidFieldExperiment[] = "SafeBrowsingAndroid";
const char kAndroidTypesToCheckParam[] = "types_to_check";
} // namespace
namespace safe_browsing {
//
// RemoteSafeBrowsingDatabaseManager::ClientRequest methods
//
class RemoteSafeBrowsingDatabaseManager::ClientRequest {
public:
ClientRequest(Client* client,
RemoteSafeBrowsingDatabaseManager* db_manager,
const GURL& url);
static void OnRequestDoneWeak(const base::WeakPtr<ClientRequest>& req,
SBThreatType matched_threat_type,
const std::string& metadata);
void OnRequestDone(SBThreatType matched_threat_type,
const std::string& metadata);
// Accessors
Client* client() const { return client_; }
const GURL& url() const { return url_; }
base::WeakPtr<ClientRequest> GetWeakPtr() {
return weak_factory_.GetWeakPtr();
}
private:
Client* client_;
RemoteSafeBrowsingDatabaseManager* db_manager_;
GURL url_;
base::ElapsedTimer timer_;
base::WeakPtrFactory<ClientRequest> weak_factory_;
};
RemoteSafeBrowsingDatabaseManager::ClientRequest::ClientRequest(
Client* client,
RemoteSafeBrowsingDatabaseManager* db_manager,
const GURL& url)
: client_(client),
db_manager_(db_manager),
url_(url),
weak_factory_(this) {}
// Static
void RemoteSafeBrowsingDatabaseManager::ClientRequest::OnRequestDoneWeak(
const base::WeakPtr<ClientRequest>& req,
SBThreatType matched_threat_type,
const std::string& metadata) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
if (!req)
return; // Previously canceled
req->OnRequestDone(matched_threat_type, metadata);
}
void RemoteSafeBrowsingDatabaseManager::ClientRequest::OnRequestDone(
SBThreatType matched_threat_type,
const std::string& metadata) {
DVLOG(1) << "OnRequestDone took " << timer_.Elapsed().InMilliseconds()
<< " ms for client " << client_ << " and URL " << url_;
client_->OnCheckBrowseUrlResult(url_, matched_threat_type, metadata);
UMA_HISTOGRAM_TIMES("SB2.RemoteCall.Elapsed", timer_.Elapsed());
// CancelCheck() will delete *this.
db_manager_->CancelCheck(client_);
}
//
// RemoteSafeBrowsingDatabaseManager methods
//
// TODO(nparker): Add more tests for this class
RemoteSafeBrowsingDatabaseManager::RemoteSafeBrowsingDatabaseManager()
: RemoteSafeBrowsingDatabaseManager(NULL, V4GetHashProtocolConfig()) {
}
RemoteSafeBrowsingDatabaseManager::RemoteSafeBrowsingDatabaseManager(
net::URLRequestContextGetter* request_context_getter,
const V4GetHashProtocolConfig& config)
: SafeBrowsingDatabaseManager(request_context_getter, config),
enabled_(false) {
// Decide which resource types to check. These two are the minimum.
resource_types_to_check_.insert(content::RESOURCE_TYPE_MAIN_FRAME);
resource_types_to_check_.insert(content::RESOURCE_TYPE_SUB_FRAME);
// The param is expected to be a comma-separated list of ints
// corresponding to the enum types. We're keeping this finch
// control around so we can add back types if they later become dangerous.
const std::string ints_str = variations::GetVariationParamValue(
kAndroidFieldExperiment, kAndroidTypesToCheckParam);
if (ints_str.empty()) {
// By default, we check all types except a few.
static_assert(content::RESOURCE_TYPE_LAST_TYPE ==
content::RESOURCE_TYPE_PLUGIN_RESOURCE + 1,
"Decide if new resource type should be skipped on mobile.");
for (int t_int = 0; t_int < content::RESOURCE_TYPE_LAST_TYPE; t_int++) {
content::ResourceType t = static_cast<content::ResourceType>(t_int);
switch (t) {
case content::RESOURCE_TYPE_STYLESHEET:
case content::RESOURCE_TYPE_IMAGE:
case content::RESOURCE_TYPE_FONT_RESOURCE:
case content::RESOURCE_TYPE_FAVICON:
break;
default:
resource_types_to_check_.insert(t);
}
}
} else {
// Use the finch param.
for (const std::string& val_str : base::SplitString(
ints_str, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL)) {
int i;
if (base::StringToInt(val_str, &i) && i >= 0 &&
i < content::RESOURCE_TYPE_LAST_TYPE) {
resource_types_to_check_.insert(static_cast<content::ResourceType>(i));
}
}
}
}
RemoteSafeBrowsingDatabaseManager::~RemoteSafeBrowsingDatabaseManager() {
DCHECK(!enabled_);
}
bool RemoteSafeBrowsingDatabaseManager::IsSupported() const {
return SafeBrowsingApiHandler::GetInstance() != nullptr;
}
safe_browsing::ThreatSource RemoteSafeBrowsingDatabaseManager::GetThreatSource()
const {
return safe_browsing::ThreatSource::REMOTE;
}
bool RemoteSafeBrowsingDatabaseManager::ChecksAreAlwaysAsync() const {
return true;
}
bool RemoteSafeBrowsingDatabaseManager::CanCheckResourceType(
content::ResourceType resource_type) const {
return resource_types_to_check_.count(resource_type) > 0;
}
bool RemoteSafeBrowsingDatabaseManager::CanCheckUrl(const GURL& url) const {
return url.SchemeIs(url::kHttpsScheme) || url.SchemeIs(url::kHttpScheme) ||
url.SchemeIs(url::kFtpScheme);
}
bool RemoteSafeBrowsingDatabaseManager::download_protection_enabled() const {
return false;
}
bool RemoteSafeBrowsingDatabaseManager::CheckDownloadUrl(
const std::vector<GURL>& url_chain,
Client* client) {
NOTREACHED();
return true;
}
bool RemoteSafeBrowsingDatabaseManager::CheckExtensionIDs(
const std::set<std::string>& extension_ids,
Client* client) {
NOTREACHED();
return true;
}
bool RemoteSafeBrowsingDatabaseManager::MatchMalwareIP(
const std::string& ip_address) {
NOTREACHED();
return false;
}
bool RemoteSafeBrowsingDatabaseManager::MatchCsdWhitelistUrl(const GURL& url) {
NOTREACHED();
return true;
}
bool RemoteSafeBrowsingDatabaseManager::MatchDownloadWhitelistUrl(
const GURL& url) {
NOTREACHED();
return true;
}
bool RemoteSafeBrowsingDatabaseManager::MatchDownloadWhitelistString(
const std::string& str) {
NOTREACHED();
return true;
}
bool RemoteSafeBrowsingDatabaseManager::MatchInclusionWhitelistUrl(
const GURL& url) {
NOTREACHED();
return true;
}
bool RemoteSafeBrowsingDatabaseManager::MatchModuleWhitelistString(
const std::string& str) {
NOTREACHED();
return true;
}
bool RemoteSafeBrowsingDatabaseManager::IsMalwareKillSwitchOn() {
NOTREACHED();
return true;
}
bool RemoteSafeBrowsingDatabaseManager::IsCsdWhitelistKillSwitchOn() {
NOTREACHED();
return true;
}
bool RemoteSafeBrowsingDatabaseManager::CheckBrowseUrl(const GURL& url,
Client* client) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
if (!enabled_)
return true;
bool can_check_url = CanCheckUrl(url);
UMA_HISTOGRAM_BOOLEAN("SB2.RemoteCall.CanCheckUrl", can_check_url);
if (!can_check_url)
return true; // Safe, continue right away.
scoped_ptr<ClientRequest> req(new ClientRequest(client, this, url));
std::vector<SBThreatType> threat_types; // Not currently used.
DVLOG(1) << "Checking for client " << client << " and URL " << url;
SafeBrowsingApiHandler* api_handler = SafeBrowsingApiHandler::GetInstance();
// This shouldn't happen since SafeBrowsingResourceThrottle checks
// IsSupported() ealier.
DCHECK(api_handler) << "SafeBrowsingApiHandler was never constructed";
api_handler->StartURLCheck(
base::Bind(&ClientRequest::OnRequestDoneWeak, req->GetWeakPtr()), url,
threat_types);
UMA_HISTOGRAM_COUNTS_10000("SB2.RemoteCall.ChecksPending",
current_requests_.size());
current_requests_.push_back(req.release());
// Defer the resource load.
return false;
}
void RemoteSafeBrowsingDatabaseManager::CancelCheck(Client* client) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
DCHECK(enabled_);
for (auto itr = current_requests_.begin(); itr != current_requests_.end();
++itr) {
if ((*itr)->client() == client) {
DVLOG(2) << "Canceling check for URL " << (*itr)->url();
delete *itr;
current_requests_.erase(itr);
return;
}
}
NOTREACHED();
}
void RemoteSafeBrowsingDatabaseManager::StartOnIOThread() {
VLOG(1) << "RemoteSafeBrowsingDatabaseManager starting";
enabled_ = true;
}
void RemoteSafeBrowsingDatabaseManager::StopOnIOThread(bool shutdown) {
// |shutdown| is not used.
DCHECK_CURRENTLY_ON(BrowserThread::IO);
DVLOG(1) << "RemoteSafeBrowsingDatabaseManager stopping";
// Call back and delete any remaining clients. OnRequestDone() modifies
// |current_requests_|, so we make a copy first.
std::vector<ClientRequest*> to_callback(current_requests_);
for (auto req : to_callback) {
DVLOG(1) << "Stopping: Invoking unfinished req for URL " << req->url();
req->OnRequestDone(SB_THREAT_TYPE_SAFE, std::string());
}
enabled_ = false;
}
} // namespace safe_browsing
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