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// Copyright (c) 2011 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 "chrome/browser/download/download_safe_browsing_client.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/logging.h"
#include "base/metrics/histogram.h"
#include "base/metrics/stats_counters.h"
#include "base/string_number_conversions.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/safe_browsing/safe_browsing_util.h"
#include "chrome/common/chrome_switches.h"
#include "content/browser/browser_thread.h"
#include "content/browser/download/download_create_info.h"
#include "content/browser/download/download_manager.h"
#include "content/browser/renderer_host/resource_dispatcher_host.h"
// TODO(lzheng): Get rid of the AddRef and Release after
// SafeBrowsingService::Client is changed to RefCountedThreadSafe<>.
DownloadSBClient::DownloadSBClient(int32 download_id,
const std::vector<GURL>& url_chain,
const GURL& referrer_url,
bool safe_browsing_enabled)
: download_id_(download_id),
url_chain_(url_chain),
referrer_url_(referrer_url),
safe_browsing_enabled_(safe_browsing_enabled) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
DCHECK(!url_chain.empty());
ResourceDispatcherHost* rdh = g_browser_process->resource_dispatcher_host();
if (rdh)
sb_service_ = g_browser_process->safe_browsing_service();
}
DownloadSBClient::~DownloadSBClient() {}
void DownloadSBClient::CheckDownloadUrl(const UrlDoneCallback& callback) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
// It is not allowed to call this method twice.
CHECK(url_done_callback_.is_null() && hash_done_callback_.is_null());
start_time_ = base::TimeTicks::Now();
url_done_callback_ = callback;
BrowserThread::PostTask(
BrowserThread::IO, FROM_HERE,
base::Bind(&DownloadSBClient::CheckDownloadUrlOnIOThread, this,
url_chain_));
}
void DownloadSBClient::CheckDownloadHash(const std::string& hash,
const HashDoneCallback& callback) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
// It is not allowed to call this method twice.
CHECK(url_done_callback_.is_null() && hash_done_callback_.is_null());
start_time_ = base::TimeTicks::Now();
hash_done_callback_ = callback;
BrowserThread::PostTask(
BrowserThread::IO, FROM_HERE,
base::Bind(&DownloadSBClient::CheckDownloadHashOnIOThread, this, hash));
}
void DownloadSBClient::CheckDownloadUrlOnIOThread(
const std::vector<GURL>& url_chain) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
// Will be released in OnDownloadUrlCheckResult.
AddRef();
if (safe_browsing_enabled_ && sb_service_.get() &&
!sb_service_->CheckDownloadUrl(url_chain, this)) {
// Wait for SafeBrowsingService to call back OnDownloadUrlCheckResult.
return;
}
OnDownloadUrlCheckResult(url_chain, SafeBrowsingService::SAFE);
}
// The callback interface for SafeBrowsingService::Client.
// Called when the result of checking a download URL is known.
void DownloadSBClient::OnDownloadUrlCheckResult(
const std::vector<GURL>& url_chain,
SafeBrowsingService::UrlCheckResult result) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
BrowserThread::PostTask(
BrowserThread::UI, FROM_HERE,
base::Bind(&DownloadSBClient::SafeBrowsingCheckUrlDone, this, result));
Release();
}
void DownloadSBClient::CheckDownloadHashOnIOThread(const std::string& hash) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
// Will be released in OnDownloadUrlCheckResult.
AddRef();
if (safe_browsing_enabled_ && sb_service_.get() &&
!sb_service_->CheckDownloadHash(hash, this)) {
// Wait for SafeBrowsingService to call back OnDownloadUrlCheckResult.
return;
}
OnDownloadHashCheckResult(hash, SafeBrowsingService::SAFE);
}
// The callback interface for SafeBrowsingService::Client.
// Called when the result of checking a download URL is known.
void DownloadSBClient::OnDownloadHashCheckResult(
const std::string& hash, SafeBrowsingService::UrlCheckResult result) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
BrowserThread::PostTask(
BrowserThread::UI, FROM_HERE,
base::Bind(&DownloadSBClient::SafeBrowsingCheckHashDone, this, result,
hash));
Release();
}
void DownloadSBClient::SafeBrowsingCheckUrlDone(
SafeBrowsingService::UrlCheckResult result) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
DVLOG(1) << "SafeBrowsingCheckUrlDone with result: " << result;
bool is_dangerous = result != SafeBrowsingService::SAFE;
url_done_callback_.Run(download_id_, is_dangerous);
if (sb_service_.get() && sb_service_->download_protection_enabled()) {
UMA_HISTOGRAM_TIMES("SB2.DownloadUrlCheckDuration",
base::TimeTicks::Now() - start_time_);
UpdateDownloadCheckStats(DOWNLOAD_URL_CHECKS_TOTAL);
if (is_dangerous) {
UpdateDownloadCheckStats(DOWNLOAD_URL_CHECKS_MALWARE);
ReportMalware(result, std::string());
}
}
}
void DownloadSBClient::SafeBrowsingCheckHashDone(
SafeBrowsingService::UrlCheckResult result,
const std::string& hash) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
DVLOG(1) << "SafeBrowsingCheckHashDone with result: " << result;
bool is_dangerous = result != SafeBrowsingService::SAFE;
hash_done_callback_.Run(download_id_, is_dangerous);
if (sb_service_.get() && sb_service_->download_protection_enabled()) {
UMA_HISTOGRAM_TIMES("SB2.DownloadHashCheckDuration",
base::TimeTicks::Now() - start_time_);
UpdateDownloadCheckStats(DOWNLOAD_HASH_CHECKS_TOTAL);
if (is_dangerous) {
UpdateDownloadCheckStats(DOWNLOAD_HASH_CHECKS_MALWARE);
ReportMalware(result, hash);
}
}
}
void DownloadSBClient::ReportMalware(
SafeBrowsingService::UrlCheckResult result,
const std::string& hash) {
std::string post_data;
if (!hash.empty())
post_data += base::HexEncode(hash.data(), hash.size()) + "\n";
for (size_t i = 0; i < url_chain_.size(); ++i)
post_data += url_chain_[i].spec() + "\n";
sb_service_->ReportSafeBrowsingHit(url_chain_.back(), // malicious_url
url_chain_.front(), // page_url
referrer_url_,
true, // is_subresource
result,
post_data);
}
void DownloadSBClient::UpdateDownloadCheckStats(SBStatsType stat_type) {
UMA_HISTOGRAM_ENUMERATION("SB2.DownloadChecks",
stat_type,
DOWNLOAD_CHECKS_MAX);
}
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