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// Copyright 2019 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/verdict_cache_manager.h"
#include <optional>
#include <string_view>
#include "base/base64.h"
#include "base/command_line.h"
#include "base/containers/contains.h"
#include "base/metrics/histogram_functions.h"
#include "base/metrics/histogram_macros.h"
#include "base/rand_util.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/task/sequenced_task_runner.h"
#include "base/time/time.h"
#include "base/values.h"
#include "components/content_settings/core/browser/host_content_settings_map.h"
#include "components/content_settings/core/common/content_settings_utils.h"
#include "components/history/core/browser/history_service_observer.h"
#include "components/safe_browsing/core/browser/db/v4_protocol_manager_util.h"
#include "components/safe_browsing/core/common/hashprefix_realtime/hash_realtime_utils.h"
#include "components/safe_browsing/core/common/proto/csd.pb.h"
#include "components/safe_browsing/core/common/safebrowsing_constants.h"
#include "components/safe_browsing/core/common/safebrowsing_switches.h"
namespace safe_browsing {
namespace {
// Keys for storing password protection verdict into a base::Value::Dict.
const char kCacheCreationTime[] = "cache_creation_time";
const char kVerdictProto[] = "verdict_proto";
const char kRealTimeThreatInfoProto[] = "rt_threat_info_proto";
const char kPasswordOnFocusCacheKey[] = "password_on_focus_cache_key";
const char kRealTimeUrlCacheKey[] = "real_time_url_cache_key";
const char kCsdTypeCacheKey[] = "client_side_detection_type_cache_key";
const char kLlamaForcedTriggerInfoKey[] = "llama_forced_trigger_info_key";
// The maximum number of entries to be removed in a single cleanup. Removing too
// many entries all at once could cause jank.
const int kMaxRemovedEntriesCount = 1000;
// The interval between the construction and the first cleanup is performed.
const int kCleanUpIntervalInitSecond = 120;
// The interval between every cleanup task.
const int kCleanUpIntervalSecond = 1800;
// The longest duration that a cache can be stored. If a cache is stored
// longer than the upper bound, it will be evicted.
const int kCacheDurationUpperBoundSecond = 7 * 24 * 60 * 60; // 7 days
// The length of a randomly generated page load token.
const int kPageLoadTokenBytes = 32;
// The expiration time of a page load token.
const int kPageLoadTokenExpireMinute = 10;
// A helper class to include all match params. It is used as a centralized
// place to determine if the current cache entry should be considered as a
// match.
struct MatchParams {
MatchParams() = default;
bool ShouldMatch() {
return !is_only_exact_match_allowed || (is_exact_host && is_exact_path);
}
// Indicates whether the current cache entry and the url have the same host.
bool is_exact_host = false;
// Indicates whether the current cache entry and the url have the same path.
bool is_exact_path = false;
// Indicates whether the current cache entry is only applicable for exact
// match.
bool is_only_exact_match_allowed = true;
};
// Given a URL of either http or https scheme, return its http://hostname.
// e.g., "https://www.foo.com:80/bar/test.cgi" -> "http://www.foo.com".
GURL GetHostNameWithHTTPScheme(const GURL& url) {
DCHECK(url.SchemeIsHTTPOrHTTPS());
std::string result(url::kHttpScheme);
result.append(url::kStandardSchemeSeparator).append(url.host());
return GURL(result);
}
// e.g, ("www.foo.com", "/bar/test.cgi") -> "http://www.foo.com/bar/test/cgi"
GURL GetUrlWithHostAndPath(const std::string& host, const std::string& path) {
std::string result(url::kHttpScheme);
result.append(url::kStandardSchemeSeparator).append(host).append(path);
return GURL(result);
}
// e.g, "www.foo.com/bar/test/cgi" -> "http://www.foo.com"
GURL GetHostNameFromCacheExpression(const std::string& cache_expression) {
std::string cache_expression_url(url::kHttpScheme);
cache_expression_url.append(url::kStandardSchemeSeparator)
.append(cache_expression);
return GetHostNameWithHTTPScheme(GURL(cache_expression_url));
}
// Convert a Proto object into a base::Value::Dict.
template <class T>
base::Value::Dict CreateDictionaryFromVerdict(const T& verdict,
const base::Time& receive_time,
const char* proto_name) {
DCHECK(proto_name == kVerdictProto || proto_name == kRealTimeThreatInfoProto);
base::Value::Dict result;
result.Set(kCacheCreationTime,
static_cast<int>(receive_time.InSecondsFSinceUnixEpoch()));
std::string serialized_proto(verdict.SerializeAsString());
// Performs a base64 encoding on the serialized proto.
serialized_proto = base::Base64Encode(serialized_proto);
result.Set(proto_name, serialized_proto);
return result;
}
template <class T>
base::Value::Dict CreateDictionaryFromVerdict(
const T& verdict,
const base::Time& receive_time,
const char* proto_name,
const safe_browsing::ClientSideDetectionType csd_type,
const safe_browsing::LlamaForcedTriggerInfo llama_forced_trigger_info) {
base::Value::Dict result =
CreateDictionaryFromVerdict(verdict, receive_time, proto_name);
result.Set(kCsdTypeCacheKey, static_cast<int>(csd_type));
std::string serialized_proto(llama_forced_trigger_info.SerializeAsString());
// Performs a base64 encoding on the serialized proto.
serialized_proto = base::Base64Encode(serialized_proto);
if (!serialized_proto.empty()) {
result.Set(kLlamaForcedTriggerInfoKey, serialized_proto);
}
return result;
}
// Generate path variants of the given URL.
void GeneratePathVariantsWithoutQuery(const GURL& url,
std::vector<std::string>* paths) {
std::string canonical_path;
V4ProtocolManagerUtil::CanonicalizeUrl(
url, /*canonicalized_hostname=*/nullptr, &canonical_path,
/*canonicalized_query=*/nullptr);
V4ProtocolManagerUtil::GeneratePathVariantsToCheck(canonical_path,
std::string(), paths);
}
template <class T>
bool ParseVerdictEntry(base::Value* verdict_entry,
int* out_verdict_received_time,
T* out_verdict,
const char* proto_name) {
DCHECK(proto_name == kVerdictProto || proto_name == kRealTimeThreatInfoProto);
if (!verdict_entry || !verdict_entry->is_dict() || !out_verdict) {
return false;
}
const base::Value::Dict& dict = verdict_entry->GetDict();
std::optional<int> cache_creation_time = dict.FindInt(kCacheCreationTime);
if (!cache_creation_time) {
return false;
}
*out_verdict_received_time = cache_creation_time.value();
const std::string* verdict_proto = dict.FindString(proto_name);
if (!verdict_proto) {
return false;
}
std::string serialized_proto;
return base::Base64Decode(*verdict_proto, &serialized_proto) &&
out_verdict->ParseFromString(serialized_proto);
}
// Return the path of the cache expression. e.g.:
// "www.google.com" -> ""
// "www.google.com/abc" -> "/abc"
// "foo.com/foo/bar/" -> "/foo/bar/"
std::string GetCacheExpressionPath(const std::string& cache_expression) {
DCHECK(!cache_expression.empty());
size_t first_slash_pos = cache_expression.find_first_of("/");
if (first_slash_pos == std::string::npos) {
return "";
}
return cache_expression.substr(first_slash_pos);
}
// Returns the number of path segments in |cache_expression_path|.
// For example, return 0 for "/", since there is no path after the leading
// slash; return 3 for "/abc/def/gh.html".
size_t GetPathDepth(const std::string& cache_expression_path) {
return base::SplitString(std::string_view(cache_expression_path), "/",
base::KEEP_WHITESPACE, base::SPLIT_WANT_NONEMPTY)
.size();
}
size_t GetHostDepth(const std::string& hostname) {
return base::SplitString(std::string_view(hostname), ".",
base::KEEP_WHITESPACE, base::SPLIT_WANT_NONEMPTY)
.size();
}
bool PathVariantsMatchCacheExpression(
const std::vector<std::string>& generated_paths,
const std::string& cache_expression_path) {
return base::Contains(generated_paths, cache_expression_path);
}
bool IsCacheExpired(int cache_creation_time, int cache_duration) {
// Note that we assume client's clock is accurate or almost accurate.
return base::Time::Now().InSecondsFSinceUnixEpoch() >
static_cast<double>(cache_creation_time + cache_duration);
}
bool IsCacheOlderThanUpperBound(int cache_creation_time) {
return base::Time::Now().InSecondsFSinceUnixEpoch() >
static_cast<double>(cache_creation_time +
kCacheDurationUpperBoundSecond);
}
template <class T>
VerdictCacheManager::DictionaryCounts ComputeCountsAndMaybeRemoveExpiredEntries(
base::Value::Dict& verdict_dictionary,
const char* proto_name,
bool remove_entries) {
DCHECK(proto_name == kVerdictProto || proto_name == kRealTimeThreatInfoProto);
std::vector<std::string> expired_keys;
VerdictCacheManager::DictionaryCounts counts;
counts.num_entries = verdict_dictionary.size();
if (!remove_entries) {
// Return early if we are just interested in the entry count, not in
// removing expired entries.
return counts;
}
for (auto item : verdict_dictionary) {
int verdict_received_time;
T verdict;
if (!ParseVerdictEntry<T>(&item.second, &verdict_received_time, &verdict,
proto_name) ||
IsCacheExpired(verdict_received_time, verdict.cache_duration_sec()) ||
IsCacheOlderThanUpperBound(verdict_received_time)) {
expired_keys.push_back(item.first);
}
}
for (const std::string& key : expired_keys) {
verdict_dictionary.Remove(key);
}
counts.num_removed_expired_entries = expired_keys.size();
return counts;
}
std::string GetKeyOfTypeFromTriggerType(
LoginReputationClientRequest::TriggerType trigger_type,
ReusedPasswordAccountType password_type) {
return trigger_type == LoginReputationClientRequest::UNFAMILIAR_LOGIN_PAGE
? kPasswordOnFocusCacheKey
: base::NumberToString(
static_cast<std::underlying_type_t<
ReusedPasswordAccountType::AccountType>>(
password_type.account_type()));
}
// If the verdict doesn't have |cache_expression_match_type| field, always
// interpret it as exact match only.
template <typename T>
bool IsOnlyExactMatchAllowed(T verdict) {
NOTREACHED();
}
template <>
bool IsOnlyExactMatchAllowed<RTLookupResponse::ThreatInfo>(
RTLookupResponse::ThreatInfo verdict) {
return verdict.cache_expression_match_type() ==
RTLookupResponse::ThreatInfo::EXACT_MATCH;
}
// Always do fuzzy matching for password protection verdicts.
template <>
bool IsOnlyExactMatchAllowed<LoginReputationClientResponse>(
LoginReputationClientResponse verdict) {
return false;
}
template <typename T>
std::string GetCacheExpression(T verdict) {
NOTREACHED();
}
template <>
std::string GetCacheExpression<RTLookupResponse::ThreatInfo>(
RTLookupResponse::ThreatInfo verdict) {
return verdict.cache_expression_using_match_type();
}
template <>
std::string GetCacheExpression<LoginReputationClientResponse>(
LoginReputationClientResponse verdict) {
return verdict.cache_expression();
}
template <class T>
std::optional<base::Value> GetMostMatchingCachedVerdictEntryWithPathMatching(
const GURL& url,
const std::string& type_key,
scoped_refptr<HostContentSettingsMap> content_settings,
const ContentSettingsType contents_setting_type,
const char* proto_name,
MatchParams match_params) {
DCHECK(proto_name == kVerdictProto || proto_name == kRealTimeThreatInfoProto);
std::optional<base::Value> result;
GURL hostname = GetHostNameWithHTTPScheme(url);
base::Value cache_dictionary_value = content_settings->GetWebsiteSetting(
hostname, GURL(), contents_setting_type, nullptr);
if (!cache_dictionary_value.is_dict()) {
return std::nullopt;
}
base::Value::Dict* verdict_dictionary =
cache_dictionary_value.GetDict().FindDict(type_key);
if (!verdict_dictionary) {
return std::nullopt;
}
std::vector<std::string> paths;
GeneratePathVariantsWithoutQuery(url, &paths);
std::string root_path;
V4ProtocolManagerUtil::CanonicalizeUrl(
url, /*canonicalized_hostname*/ nullptr, &root_path,
/*canonicalized_query*/ nullptr);
int max_path_depth = -1;
for (const auto [key, value] : *verdict_dictionary) {
int verdict_received_time;
T verdict;
// Ignore any entry that we cannot parse. These invalid entries will be
// cleaned up during shutdown.
if (!ParseVerdictEntry<T>(&value, &verdict_received_time, &verdict,
proto_name)) {
continue;
}
// Since verdict content settings are keyed by origin, we only need to
// compare the path part of the cache_expression and the given url.
std::string cache_expression_path =
GetCacheExpressionPath(GetCacheExpression(verdict));
match_params.is_only_exact_match_allowed = IsOnlyExactMatchAllowed(verdict);
match_params.is_exact_path = (root_path == cache_expression_path);
// Finds the most specific match.
int path_depth = static_cast<int>(GetPathDepth(cache_expression_path));
if (path_depth > max_path_depth &&
PathVariantsMatchCacheExpression(paths, cache_expression_path) &&
match_params.ShouldMatch() &&
!IsCacheExpired(verdict_received_time, verdict.cache_duration_sec())) {
max_path_depth = path_depth;
result = std::move(value);
}
}
return result;
}
template <class T>
std::optional<base::Value>
GetMostMatchingCachedVerdictEntryWithHostAndPathMatching(
const GURL& url,
const std::string& type_key,
scoped_refptr<HostContentSettingsMap> content_settings,
const ContentSettingsType contents_setting_type,
const char* proto_name) {
DCHECK(proto_name == kVerdictProto || proto_name == kRealTimeThreatInfoProto);
std::optional<base::Value> most_matching_verdict;
MatchParams match_params;
std::string root_host, root_path;
V4ProtocolManagerUtil::CanonicalizeUrl(url, &root_host, &root_path,
/*canonicalized_query*/ nullptr);
std::vector<std::string> host_variants;
V4ProtocolManagerUtil::GenerateHostVariantsToCheck(root_host, &host_variants);
int max_path_depth = -1;
for (const auto& host : host_variants) {
int depth = static_cast<int>(GetHostDepth(host));
GURL url_to_check = GetUrlWithHostAndPath(host, root_path);
match_params.is_exact_host = (root_host == host);
std::optional<base::Value> verdict =
GetMostMatchingCachedVerdictEntryWithPathMatching<T>(
url_to_check, type_key, content_settings, contents_setting_type,
proto_name, match_params);
if (depth > max_path_depth && verdict && verdict->is_dict()) {
max_path_depth = depth;
most_matching_verdict = std::move(verdict);
}
}
return most_matching_verdict;
}
template <class T>
typename T::VerdictType GetVerdictTypeFromMostMatchedCachedVerdict(
const char* proto_name,
std::optional<base::Value> verdict_entry,
T* out_response) {
DCHECK(proto_name == kVerdictProto || proto_name == kRealTimeThreatInfoProto);
if (!verdict_entry || !verdict_entry->is_dict()) {
return T::VERDICT_TYPE_UNSPECIFIED;
}
const std::string* verdict_proto_value =
verdict_entry->GetDict().FindString(proto_name);
if (verdict_proto_value) {
std::string serialized_proto = *verdict_proto_value;
if (base::Base64Decode(serialized_proto, &serialized_proto) &&
out_response->ParseFromString(serialized_proto)) {
return out_response->verdict_type();
} else {
return T::VERDICT_TYPE_UNSPECIFIED;
}
} else {
return T::VERDICT_TYPE_UNSPECIFIED;
}
}
bool HasPageLoadTokenExpired(int64_t token_time_msec) {
return base::Time::Now() -
base::Time::FromMillisecondsSinceUnixEpoch(token_time_msec) >
base::Minutes(kPageLoadTokenExpireMinute);
}
} // namespace
VerdictCacheManager::VerdictCacheManager(
history::HistoryService* history_service,
scoped_refptr<HostContentSettingsMap> content_settings,
PrefService* pref_service,
std::unique_ptr<SafeBrowsingSyncObserver> sync_observer)
: stored_verdict_count_password_on_focus_(std::nullopt),
stored_verdict_count_password_entry_(std::nullopt),
has_stored_verdicts_real_time_url_check_(false),
corrupt_real_time_cache_dictionary_override_(false),
content_settings_(content_settings),
sync_observer_(std::move(sync_observer)) {
if (history_service) {
history_service_observation_.Observe(history_service);
}
if (!content_settings->IsOffTheRecord()) {
ScheduleNextCleanUpAfterInterval(base::Seconds(kCleanUpIntervalInitSecond));
}
// pref_service can be null in tests.
if (pref_service) {
pref_change_registrar_.Init(pref_service);
pref_change_registrar_.Add(
prefs::kSafeBrowsingEnhanced,
base::BindRepeating(&VerdictCacheManager::CleanUpAllPageLoadTokens,
weak_factory_.GetWeakPtr(),
ClearReason::kSafeBrowsingStateChanged));
pref_change_registrar_.Add(
prefs::kSafeBrowsingEnabled,
base::BindRepeating(&VerdictCacheManager::CleanUpAllPageLoadTokens,
weak_factory_.GetWeakPtr(),
ClearReason::kSafeBrowsingStateChanged));
}
// sync_observer_ can be null in some embedders that don't support sync.
if (sync_observer_) {
sync_observer_->ObserveHistorySyncStateChanged(base::BindRepeating(
&VerdictCacheManager::CleanUpAllPageLoadTokens,
weak_factory_.GetWeakPtr(), ClearReason::kSyncStateChanged));
}
CacheArtificialUnsafeRealTimeUrlVerdictFromSwitch();
CacheArtificialUnsafePhishGuardVerdictFromSwitch();
CacheArtificialUnsafeHashRealTimeLookupVerdictFromSwitch();
CacheArtificialEnterpriseBlockedVerdictFromSwitch();
CacheArtificialEnterpriseWarnedVerdictFromSwitch();
}
void VerdictCacheManager::Shutdown() {
CleanUpExpiredVerdicts();
history_service_observation_.Reset();
pref_change_registrar_.RemoveAll();
sync_observer_.reset();
// Clear references to other KeyedServices.
content_settings_ = nullptr;
is_shut_down_ = true;
weak_factory_.InvalidateWeakPtrs();
}
VerdictCacheManager::~VerdictCacheManager() = default;
void VerdictCacheManager::CachePhishGuardVerdict(
LoginReputationClientRequest::TriggerType trigger_type,
ReusedPasswordAccountType password_type,
const LoginReputationClientResponse& verdict,
const base::Time& receive_time) {
if (is_shut_down_) {
return;
}
DCHECK(content_settings_);
DCHECK(trigger_type == LoginReputationClientRequest::UNFAMILIAR_LOGIN_PAGE ||
trigger_type == LoginReputationClientRequest::PASSWORD_REUSE_EVENT);
GURL hostname = GetHostNameFromCacheExpression(GetCacheExpression(verdict));
base::Value cache_dictionary_value = content_settings_->GetWebsiteSetting(
hostname, GURL(), ContentSettingsType::PASSWORD_PROTECTION, nullptr);
base::Value::Dict cache_dictionary =
cache_dictionary_value.is_dict()
? std::move(cache_dictionary_value.GetDict())
: base::Value::Dict();
base::Value::Dict verdict_entry(
CreateDictionaryFromVerdict<LoginReputationClientResponse>(
verdict, receive_time, kVerdictProto));
std::string type_key =
GetKeyOfTypeFromTriggerType(trigger_type, password_type);
base::Value::Dict* verdict_dictionary = cache_dictionary.FindDict(type_key);
if (!verdict_dictionary) {
verdict_dictionary =
cache_dictionary.Set(type_key, base::Value::Dict())->GetIfDict();
}
// Increases stored verdict count if we haven't seen this cache expression
// before.
if (!verdict_dictionary->contains(GetCacheExpression(verdict))) {
std::optional<size_t>* stored_verdict_count =
trigger_type == LoginReputationClientRequest::UNFAMILIAR_LOGIN_PAGE
? &stored_verdict_count_password_on_focus_
: &stored_verdict_count_password_entry_;
*stored_verdict_count = GetStoredPhishGuardVerdictCount(trigger_type) + 1;
}
// If same cache_expression is already in this verdict_dictionary, we simply
// override it.
verdict_dictionary->Set(GetCacheExpression(verdict),
std::move(verdict_entry));
content_settings_->SetWebsiteSettingDefaultScope(
hostname, GURL(), ContentSettingsType::PASSWORD_PROTECTION,
base::Value(std::move(cache_dictionary)));
}
LoginReputationClientResponse::VerdictType
VerdictCacheManager::GetCachedPhishGuardVerdict(
const GURL& url,
LoginReputationClientRequest::TriggerType trigger_type,
ReusedPasswordAccountType password_type,
LoginReputationClientResponse* out_response) {
DCHECK(trigger_type == LoginReputationClientRequest::UNFAMILIAR_LOGIN_PAGE ||
trigger_type == LoginReputationClientRequest::PASSWORD_REUSE_EVENT);
if (is_shut_down_) {
return LoginReputationClientResponse::VERDICT_TYPE_UNSPECIFIED;
}
std::string type_key =
GetKeyOfTypeFromTriggerType(trigger_type, password_type);
std::optional<base::Value> most_matching_verdict =
GetMostMatchingCachedVerdictEntryWithHostAndPathMatching<
LoginReputationClientResponse>(
url, type_key, content_settings_,
ContentSettingsType::PASSWORD_PROTECTION, kVerdictProto);
return GetVerdictTypeFromMostMatchedCachedVerdict<
LoginReputationClientResponse>(
kVerdictProto, std::move(most_matching_verdict), out_response);
}
size_t VerdictCacheManager::GetStoredPhishGuardVerdictCount(
LoginReputationClientRequest::TriggerType trigger_type) {
if (is_shut_down_) {
return 0;
}
DCHECK(content_settings_);
DCHECK(trigger_type == LoginReputationClientRequest::UNFAMILIAR_LOGIN_PAGE ||
trigger_type == LoginReputationClientRequest::PASSWORD_REUSE_EVENT);
std::optional<size_t>* stored_verdict_count =
trigger_type == LoginReputationClientRequest::UNFAMILIAR_LOGIN_PAGE
? &stored_verdict_count_password_on_focus_
: &stored_verdict_count_password_entry_;
// If we have already computed this, return its value.
if (stored_verdict_count->has_value()) {
return stored_verdict_count->value();
}
stored_verdict_count_password_on_focus_ = 0;
stored_verdict_count_password_entry_ = 0;
for (const ContentSettingPatternSource& source :
content_settings_->GetSettingsForOneType(
ContentSettingsType::PASSWORD_PROTECTION)) {
for (auto item : source.setting_value.GetDict()) {
if (item.first == std::string_view(kPasswordOnFocusCacheKey)) {
stored_verdict_count_password_on_focus_.value() +=
item.second.GetDict().size();
} else {
stored_verdict_count_password_entry_.value() +=
item.second.GetDict().size();
}
}
}
return stored_verdict_count->value();
}
void VerdictCacheManager::CacheRealTimeUrlVerdict(
const RTLookupResponse& verdict,
const base::Time& receive_time) {
if (is_shut_down_) {
return;
}
std::vector<std::string> visited_cache_expressions;
safe_browsing::ClientSideDetectionType csd_type =
verdict.client_side_detection_type();
safe_browsing::LlamaForcedTriggerInfo llama_forced_trigger_info =
verdict.llama_forced_trigger_info();
for (const auto& threat_info : verdict.threat_info()) {
// If |cache_expression_match_type| is unspecified, ignore this entry.
if (threat_info.cache_expression_match_type() ==
RTLookupResponse::ThreatInfo::MATCH_TYPE_UNSPECIFIED) {
continue;
}
std::string cache_expression = GetCacheExpression(threat_info);
// For the same cache_expression, threat_info is in decreasing order of
// severity. To avoid lower severity threat being overridden by higher one,
// only store threat info that is first seen for a cache expression.
if (base::Contains(visited_cache_expressions, cache_expression)) {
continue;
}
GURL hostname = GetHostNameFromCacheExpression(cache_expression);
base::Value cache_dictionary_value = content_settings_->GetWebsiteSetting(
hostname, GURL(), ContentSettingsType::SAFE_BROWSING_URL_CHECK_DATA,
nullptr);
base::Value::Dict cache_dictionary =
cache_dictionary_value.is_dict()
? std::move(cache_dictionary_value.GetDict())
: base::Value::Dict();
base::Value::Dict* verdict_dictionary =
cache_dictionary.FindDict(kRealTimeUrlCacheKey);
if (!verdict_dictionary) {
verdict_dictionary =
cache_dictionary.Set(kRealTimeUrlCacheKey, base::Value::Dict())
->GetIfDict();
}
base::Value::Dict threat_info_entry =
CreateDictionaryFromVerdict<RTLookupResponse::ThreatInfo>(
threat_info, receive_time, kRealTimeThreatInfoProto, csd_type,
llama_forced_trigger_info);
has_stored_verdicts_real_time_url_check_ = true;
verdict_dictionary->Set(cache_expression, std::move(threat_info_entry));
visited_cache_expressions.push_back(cache_expression);
content_settings_->SetWebsiteSettingDefaultScope(
hostname, GURL(), ContentSettingsType::SAFE_BROWSING_URL_CHECK_DATA,
base::Value(std::move(cache_dictionary)));
}
}
RTLookupResponse::ThreatInfo::VerdictType
VerdictCacheManager::GetCachedRealTimeUrlVerdict(
const GURL& url,
RTLookupResponse::ThreatInfo* out_threat_info) {
if (is_shut_down_) {
return RTLookupResponse::ThreatInfo::VERDICT_TYPE_UNSPECIFIED;
}
std::optional<base::Value> most_matching_verdict =
GetMostMatchingCachedVerdictEntryWithHostAndPathMatching<
RTLookupResponse::ThreatInfo>(
url, kRealTimeUrlCacheKey, content_settings_,
ContentSettingsType::SAFE_BROWSING_URL_CHECK_DATA,
kRealTimeThreatInfoProto);
return GetVerdictTypeFromMostMatchedCachedVerdict<
RTLookupResponse::ThreatInfo>(kRealTimeThreatInfoProto,
std::move(most_matching_verdict),
out_threat_info);
}
safe_browsing::ClientSideDetectionType
VerdictCacheManager::GetCachedRealTimeUrlClientSideDetectionType(
const GURL& url) {
if (is_shut_down_) {
return safe_browsing::ClientSideDetectionType::
CLIENT_SIDE_DETECTION_TYPE_UNSPECIFIED;
}
std::optional<base::Value> most_matching_verdict =
GetMostMatchingCachedVerdictEntryWithHostAndPathMatching<
RTLookupResponse::ThreatInfo>(
url, kRealTimeUrlCacheKey, content_settings_,
ContentSettingsType::SAFE_BROWSING_URL_CHECK_DATA,
kRealTimeThreatInfoProto);
if (!most_matching_verdict || !most_matching_verdict->is_dict()) {
return safe_browsing::ClientSideDetectionType::
CLIENT_SIDE_DETECTION_TYPE_UNSPECIFIED;
}
const std::optional<int> cache_client_side_detection_type =
most_matching_verdict->GetDict().FindInt(kCsdTypeCacheKey);
if (cache_client_side_detection_type) {
return static_cast<safe_browsing::ClientSideDetectionType>(
cache_client_side_detection_type.value());
} else {
return safe_browsing::ClientSideDetectionType::
CLIENT_SIDE_DETECTION_TYPE_UNSPECIFIED;
}
}
bool VerdictCacheManager::GetCachedRealTimeLlamaForcedTriggerInfo(
const GURL& url,
safe_browsing::LlamaForcedTriggerInfo* out_llama_forced_trigger_info) {
if (is_shut_down_) {
return false;
}
std::optional<base::Value> most_matching_verdict =
GetMostMatchingCachedVerdictEntryWithHostAndPathMatching<
RTLookupResponse::ThreatInfo>(
url, kRealTimeUrlCacheKey, content_settings_,
ContentSettingsType::SAFE_BROWSING_URL_CHECK_DATA,
kRealTimeThreatInfoProto);
if (!most_matching_verdict || !most_matching_verdict->is_dict()) {
return false;
}
const std::string* cache_llama_forced_trigger_info =
most_matching_verdict->GetDict().FindString(kLlamaForcedTriggerInfoKey);
if (cache_llama_forced_trigger_info) {
std::string serialized_llama_forced_trigger_info =
*cache_llama_forced_trigger_info;
if (base::Base64Decode(serialized_llama_forced_trigger_info,
&serialized_llama_forced_trigger_info)) {
return out_llama_forced_trigger_info->ParseFromString(
serialized_llama_forced_trigger_info);
}
}
return false;
}
ChromeUserPopulation::PageLoadToken VerdictCacheManager::CreatePageLoadToken(
const GURL& url) {
std::string hostname = url.host();
ChromeUserPopulation::PageLoadToken token;
token.set_token_source(
ChromeUserPopulation::PageLoadToken::CLIENT_GENERATION);
token.set_token_time_msec(base::Time::Now().InMillisecondsSinceUnixEpoch());
token.set_token_value(base::RandBytesAsString(kPageLoadTokenBytes));
page_load_token_map_[hostname] = token;
return token;
}
ChromeUserPopulation::PageLoadToken VerdictCacheManager::GetPageLoadToken(
const GURL& url) {
std::string hostname = url.host();
if (!base::Contains(page_load_token_map_, hostname)) {
return ChromeUserPopulation::PageLoadToken();
}
ChromeUserPopulation::PageLoadToken token = page_load_token_map_[hostname];
bool has_expired = HasPageLoadTokenExpired(token.token_time_msec());
base::UmaHistogramLongTimes(
"SafeBrowsing.PageLoadToken.Duration",
base::Time::Now() -
base::Time::FromMillisecondsSinceUnixEpoch(token.token_time_msec()));
base::UmaHistogramBoolean("SafeBrowsing.PageLoadToken.HasExpired",
has_expired);
return has_expired ? ChromeUserPopulation::PageLoadToken() : token;
}
void VerdictCacheManager::CacheHashPrefixRealTimeLookupResults(
const std::vector<std::string>& requested_hash_prefixes,
const std::vector<V5::FullHash>& response_full_hashes,
const V5::Duration& cache_duration) {
hash_realtime_cache_->CacheSearchHashesResponse(
requested_hash_prefixes, response_full_hashes, cache_duration);
}
std::unordered_map<std::string, std::vector<V5::FullHash>>
VerdictCacheManager::GetCachedHashPrefixRealTimeLookupResults(
const std::set<std::string>& hash_prefixes) {
return hash_realtime_cache_->SearchCache(hash_prefixes);
}
void VerdictCacheManager::ScheduleNextCleanUpAfterInterval(
base::TimeDelta interval) {
cleanup_timer_.Stop();
cleanup_timer_.Start(FROM_HERE, interval, this,
&VerdictCacheManager::CleanUpExpiredVerdicts);
}
void VerdictCacheManager::CleanUpExpiredVerdicts() {
if (is_shut_down_) {
return;
}
DCHECK(content_settings_);
SCOPED_UMA_HISTOGRAM_TIMER("SafeBrowsing.RT.CacheManager.CleanUpTime");
CleanUpExpiredPhishGuardVerdicts();
CleanUpExpiredRealTimeUrlCheckVerdicts();
CleanUpExpiredPageLoadTokens();
CleanUpExpiredHashPrefixRealTimeLookupResults();
ScheduleNextCleanUpAfterInterval(base::Seconds(kCleanUpIntervalSecond));
}
void VerdictCacheManager::CleanUpExpiredPhishGuardVerdicts() {
if (GetStoredPhishGuardVerdictCount(
LoginReputationClientRequest::UNFAMILIAR_LOGIN_PAGE) <= 0 &&
GetStoredPhishGuardVerdictCount(
LoginReputationClientRequest::PASSWORD_REUSE_EVENT) <= 0) {
return;
}
int removed_count = 0;
for (ContentSettingPatternSource& source :
content_settings_->GetSettingsForOneType(
ContentSettingsType::PASSWORD_PROTECTION)) {
// Find all verdicts associated with this origin.
base::Value::Dict cache_dictionary =
std::move(source.setting_value.GetDict());
bool has_expired_password_on_focus_entry = RemoveExpiredPhishGuardVerdicts(
LoginReputationClientRequest::UNFAMILIAR_LOGIN_PAGE, cache_dictionary);
bool has_expired_password_reuse_entry = RemoveExpiredPhishGuardVerdicts(
LoginReputationClientRequest::PASSWORD_REUSE_EVENT, cache_dictionary);
if (!cache_dictionary.empty() && !has_expired_password_on_focus_entry &&
!has_expired_password_reuse_entry) {
continue;
}
// Set the website setting of this origin with the updated
// |cache_dictionary|.
content_settings_->SetWebsiteSettingCustomScope(
source.primary_pattern, source.secondary_pattern,
ContentSettingsType::PASSWORD_PROTECTION,
cache_dictionary.empty() ? base::Value()
: base::Value(std::move(cache_dictionary)));
if ((++removed_count) == GetMaxRemovedEntriesCount()) {
return;
}
}
}
int VerdictCacheManager::GetMaxRemovedEntriesCount() {
if (max_removed_entries_count_override_.has_value()) {
return max_removed_entries_count_override_.value();
}
return kMaxRemovedEntriesCount;
}
void VerdictCacheManager::CleanUpExpiredRealTimeUrlCheckVerdicts() {
DictionaryCounts overall_counts;
int removed_count = 0;
if (has_stored_verdicts_real_time_url_check_) {
for (ContentSettingPatternSource& source :
content_settings_->GetSettingsForOneType(
ContentSettingsType::SAFE_BROWSING_URL_CHECK_DATA)) {
bool is_removing_allowed = removed_count < GetMaxRemovedEntriesCount();
// Find all verdicts associated with this origin.
base::Value::Dict cache_dictionary;
if (source.setting_value.is_dict() &&
!corrupt_real_time_cache_dictionary_override_) {
cache_dictionary = std::move(source.setting_value.GetDict());
DictionaryCounts counts =
ComputeCountsAndMaybeRemoveExpiredRealTimeUrlCheckVerdicts(
cache_dictionary,
/*remove_expired_verdicts=*/is_removing_allowed);
overall_counts.num_entries += counts.num_entries;
overall_counts.num_removed_expired_entries +=
counts.num_removed_expired_entries;
if (!cache_dictionary.empty() &&
counts.num_removed_expired_entries == 0U) {
continue;
}
}
// Don't continue removing entries if we're past the threshold, but
// continue counting the entries for the histogram log when the loop
// completes.
if (!is_removing_allowed) {
continue;
}
++removed_count;
// Set the website setting of this origin with the updated
// |cache_dictionary|.
content_settings_->SetWebsiteSettingCustomScope(
source.primary_pattern, source.secondary_pattern,
ContentSettingsType::SAFE_BROWSING_URL_CHECK_DATA,
cache_dictionary.empty() ? base::Value()
: base::Value(std::move(cache_dictionary)));
}
}
has_stored_verdicts_real_time_url_check_ =
overall_counts.num_entries > overall_counts.num_removed_expired_entries;
base::UmaHistogramCounts10000(
"SafeBrowsing.RT.CacheManager.RealTimeVerdictCount2",
overall_counts.num_entries);
base::UmaHistogramBoolean(
"SafeBrowsing.RT.CacheManager.CleanupReachedThreshold",
removed_count >= GetMaxRemovedEntriesCount());
}
void VerdictCacheManager::CleanUpExpiredPageLoadTokens() {
base::EraseIf(page_load_token_map_, [&](const auto& hostname_token_pair) {
ChromeUserPopulation::PageLoadToken token = hostname_token_pair.second;
return HasPageLoadTokenExpired(token.token_time_msec());
});
base::UmaHistogramCounts10000("SafeBrowsing.PageLoadToken.TokenCount",
page_load_token_map_.size());
}
void VerdictCacheManager::CleanUpAllPageLoadTokens(ClearReason reason) {
base::UmaHistogramEnumeration("SafeBrowsing.PageLoadToken.ClearReason",
reason);
page_load_token_map_.clear();
}
void VerdictCacheManager::CleanUpExpiredHashPrefixRealTimeLookupResults() {
hash_realtime_cache_->ClearExpiredResults();
}
// Overridden from history::HistoryServiceObserver.
void VerdictCacheManager::OnHistoryDeletions(
history::HistoryService* history_service,
const history::DeletionInfo& deletion_info) {
base::SequencedTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE, base::BindRepeating(
&VerdictCacheManager::RemoveContentSettingsOnURLsDeleted,
GetWeakPtr(), deletion_info.IsAllHistory(),
deletion_info.deleted_rows()));
}
// Overridden from history::HistoryServiceObserver.
void VerdictCacheManager::HistoryServiceBeingDeleted(
history::HistoryService* history_service) {
DCHECK(history_service_observation_.IsObservingSource(history_service));
history_service_observation_.Reset();
}
void VerdictCacheManager::OnCookiesDeleted() {
CleanUpAllPageLoadTokens(ClearReason::kCookiesDeleted);
}
bool VerdictCacheManager::RemoveExpiredPhishGuardVerdicts(
LoginReputationClientRequest::TriggerType trigger_type,
base::Value::Dict& cache_dictionary) {
DCHECK(trigger_type == LoginReputationClientRequest::UNFAMILIAR_LOGIN_PAGE ||
trigger_type == LoginReputationClientRequest::PASSWORD_REUSE_EVENT);
if (cache_dictionary.empty()) {
return false;
}
size_t verdicts_removed = 0;
std::vector<std::string> empty_keys;
for (auto [key, value] : cache_dictionary) {
if (trigger_type == LoginReputationClientRequest::UNFAMILIAR_LOGIN_PAGE &&
key == std::string(kPasswordOnFocusCacheKey)) {
DictionaryCounts counts = ComputeCountsAndMaybeRemoveExpiredEntries<
LoginReputationClientResponse>(value.GetDict(), kVerdictProto,
/*remove_entries=*/true);
verdicts_removed += counts.num_removed_expired_entries;
if (stored_verdict_count_password_on_focus_.has_value()) {
stored_verdict_count_password_on_focus_.value() -=
counts.num_removed_expired_entries;
}
} else {
DictionaryCounts counts = ComputeCountsAndMaybeRemoveExpiredEntries<
LoginReputationClientResponse>(value.GetDict(), kVerdictProto,
/*remove_entries=*/true);
verdicts_removed += counts.num_removed_expired_entries;
if (stored_verdict_count_password_entry_.has_value()) {
stored_verdict_count_password_entry_.value() -=
counts.num_removed_expired_entries;
}
}
if (value.GetDict().size() == 0U) {
empty_keys.push_back(key);
}
}
for (const auto& key : empty_keys) {
cache_dictionary.Remove(key);
}
return verdicts_removed > 0U;
}
VerdictCacheManager::DictionaryCounts
VerdictCacheManager::ComputeCountsAndMaybeRemoveExpiredRealTimeUrlCheckVerdicts(
base::Value::Dict& cache_dictionary,
bool remove_expired_verdicts) {
std::vector<std::string> empty_keys;
DictionaryCounts overall_counts;
for (auto [key, value] : cache_dictionary) {
bool is_key_unneeded = true;
if (value.is_dict()) {
DictionaryCounts counts = ComputeCountsAndMaybeRemoveExpiredEntries<
RTLookupResponse::ThreatInfo>(
value.GetDict(), kRealTimeThreatInfoProto,
/*remove_entries=*/remove_expired_verdicts);
overall_counts.num_removed_expired_entries +=
counts.num_removed_expired_entries;
overall_counts.num_entries += counts.num_entries;
is_key_unneeded = value.GetDict().size() == 0U;
}
if (remove_expired_verdicts && is_key_unneeded) {
empty_keys.push_back(key);
}
}
for (const auto& key : empty_keys) {
cache_dictionary.Remove(key);
}
return overall_counts;
}
void VerdictCacheManager::RemoveContentSettingsOnURLsDeleted(
bool all_history,
const history::URLRows& deleted_rows) {
if (is_shut_down_) {
return;
}
DCHECK(content_settings_);
if (all_history) {
content_settings_->ClearSettingsForOneType(
ContentSettingsType::PASSWORD_PROTECTION);
stored_verdict_count_password_on_focus_ = 0;
stored_verdict_count_password_entry_ = 0;
has_stored_verdicts_real_time_url_check_ = false;
content_settings_->ClearSettingsForOneType(
ContentSettingsType::SAFE_BROWSING_URL_CHECK_DATA);
return;
}
// For now, if a URL is deleted from history, we simply remove all the
// cached verdicts of the same origin. This is a pretty aggressive deletion.
// We might revisit this logic later to decide if we want to only delete the
// cached verdict whose cache expression matches this URL.
for (const history::URLRow& row : deleted_rows) {
if (!row.url().SchemeIsHTTPOrHTTPS()) {
continue;
}
GURL url_key = GetHostNameWithHTTPScheme(row.url());
stored_verdict_count_password_on_focus_ =
GetStoredPhishGuardVerdictCount(
LoginReputationClientRequest::UNFAMILIAR_LOGIN_PAGE) -
GetPhishGuardVerdictCountForURL(
url_key, LoginReputationClientRequest::UNFAMILIAR_LOGIN_PAGE);
stored_verdict_count_password_entry_ =
GetStoredPhishGuardVerdictCount(
LoginReputationClientRequest::PASSWORD_REUSE_EVENT) -
GetPhishGuardVerdictCountForURL(
url_key, LoginReputationClientRequest::PASSWORD_REUSE_EVENT);
content_settings_->SetWebsiteSettingDefaultScope(
url_key, GURL(), ContentSettingsType::PASSWORD_PROTECTION,
base::Value());
content_settings_->SetWebsiteSettingDefaultScope(
url_key, GURL(), ContentSettingsType::SAFE_BROWSING_URL_CHECK_DATA,
base::Value());
}
}
size_t VerdictCacheManager::GetPhishGuardVerdictCountForURL(
const GURL& url,
LoginReputationClientRequest::TriggerType trigger_type) {
DCHECK(trigger_type == LoginReputationClientRequest::UNFAMILIAR_LOGIN_PAGE ||
trigger_type == LoginReputationClientRequest::PASSWORD_REUSE_EVENT);
base::Value cache_dictionary_value = content_settings_->GetWebsiteSetting(
url, GURL(), ContentSettingsType::PASSWORD_PROTECTION, nullptr);
if (!cache_dictionary_value.is_dict()) {
return 0;
}
int verdict_cnt = 0;
if (trigger_type == LoginReputationClientRequest::UNFAMILIAR_LOGIN_PAGE) {
base::Value::Dict* password_on_focus_dict =
cache_dictionary_value.GetDict().FindDict(kPasswordOnFocusCacheKey);
verdict_cnt += password_on_focus_dict ? password_on_focus_dict->size() : 0;
} else {
for (auto [key, value] : cache_dictionary_value.GetDict()) {
if (key == kPasswordOnFocusCacheKey) {
continue;
}
verdict_cnt += value.GetDict().size();
}
}
return verdict_cnt;
}
void VerdictCacheManager::CacheArtificialUnsafeRealTimeUrlVerdictFromSwitch() {
std::string phishing_url_string =
base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kArtificialCachedUrlRealTimeVerdictFlag);
CacheArtificialRealTimeUrlVerdict(
phishing_url_string, RTLookupResponse::ThreatInfo::DANGEROUS,
RTLookupResponse::ThreatInfo::SOCIAL_ENGINEERING);
}
void VerdictCacheManager::CacheArtificialRealTimeUrlVerdict(
const std::string& url_string,
RTLookupResponse::ThreatInfo::VerdictType verdict_type,
std::optional<RTLookupResponse::ThreatInfo::ThreatType> threat_type) {
if (url_string.empty()) {
return;
}
GURL artificial_url(url_string);
if (!artificial_url.is_valid()) {
return;
}
has_artificial_cached_url_ = true;
RTLookupResponse response;
RTLookupResponse::ThreatInfo* threat_info = response.add_threat_info();
threat_info->set_verdict_type(verdict_type);
if (threat_type.has_value()) {
threat_info->set_threat_type(threat_type.value());
}
threat_info->set_cache_duration_sec(3000);
threat_info->set_cache_expression_using_match_type(
artificial_url.GetContent());
threat_info->set_cache_expression_match_type(
RTLookupResponse::ThreatInfo::EXACT_MATCH);
RemoveContentSettingsOnURLsDeleted(/*all_history=*/false,
{history::URLRow(artificial_url)});
CacheRealTimeUrlVerdict(response, base::Time::Now());
}
void VerdictCacheManager::CacheArtificialUnsafePhishGuardVerdictFromSwitch() {
std::string phishing_url_string =
base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kArtificialCachedPhishGuardVerdictFlag);
if (phishing_url_string.empty()) {
return;
}
GURL artificial_unsafe_url(phishing_url_string);
if (!artificial_unsafe_url.is_valid()) {
return;
}
has_artificial_cached_url_ = true;
ReusedPasswordAccountType reused_password_account_type;
reused_password_account_type.set_account_type(
ReusedPasswordAccountType::SAVED_PASSWORD);
LoginReputationClientResponse verdict;
verdict.set_verdict_type(LoginReputationClientResponse::PHISHING);
verdict.set_cache_expression(artificial_unsafe_url.GetContent());
verdict.set_cache_duration_sec(3000);
CachePhishGuardVerdict(LoginReputationClientRequest::PASSWORD_REUSE_EVENT,
reused_password_account_type, verdict,
base::Time::Now());
}
void VerdictCacheManager::CacheArtificialHashRealTimeLookupVerdict(
const std::string& url_spec,
bool is_unsafe) {
if (url_spec.empty()) {
return;
}
GURL artificial_unsafe_url(url_spec);
if (!artificial_unsafe_url.is_valid()) {
return;
}
has_artificial_cached_url_ = true;
std::vector<FullHashStr> full_hashes;
V4ProtocolManagerUtil::UrlToFullHashes(artificial_unsafe_url, &full_hashes);
std::vector<std::string> hash_prefixes;
for (const auto& full_hash : full_hashes) {
auto hash_prefix = hash_realtime_utils::GetHashPrefix(full_hash);
hash_prefixes.emplace_back(hash_prefix);
}
FullHashStr sample_full_hash = full_hashes[0];
V5::FullHash full_hash_object;
full_hash_object.set_full_hash(sample_full_hash);
if (is_unsafe) {
auto* details = full_hash_object.add_full_hash_details();
details->set_threat_type(V5::ThreatType::SOCIAL_ENGINEERING);
}
V5::Duration cache_duration;
cache_duration.set_seconds(3000);
CacheHashPrefixRealTimeLookupResults(hash_prefixes, {full_hash_object},
cache_duration);
}
void VerdictCacheManager::
CacheArtificialUnsafeHashRealTimeLookupVerdictFromSwitch() {
std::string phishing_url_string =
base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kArtificialCachedHashPrefixRealTimeVerdictFlag);
CacheArtificialHashRealTimeLookupVerdict(phishing_url_string,
/*is_unsafe=*/true);
}
void VerdictCacheManager::CacheArtificialEnterpriseBlockedVerdictFromSwitch() {
std::string blocked_url_string =
base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kArtificialCachedEnterpriseBlockedVerdictFlag);
CacheArtificialRealTimeUrlVerdict(
blocked_url_string, RTLookupResponse::ThreatInfo::DANGEROUS,
RTLookupResponse::ThreatInfo::MANAGED_POLICY);
}
void VerdictCacheManager::CacheArtificialEnterpriseWarnedVerdictFromSwitch() {
std::string flagged_url_string =
base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kArtificialCachedEnterpriseWarnedVerdictFlag);
CacheArtificialRealTimeUrlVerdict(
flagged_url_string, RTLookupResponse::ThreatInfo::WARN,
RTLookupResponse::ThreatInfo::MANAGED_POLICY);
}
void VerdictCacheManager::StopCleanUpTimerForTesting() {
if (cleanup_timer_.IsRunning()) {
cleanup_timer_.Stop();
}
}
void VerdictCacheManager::SetPageLoadTokenForTesting(
const GURL& url,
ChromeUserPopulation::PageLoadToken token) {
std::string hostname = url.host();
page_load_token_map_[hostname] = token;
}
// static
bool VerdictCacheManager::has_artificial_cached_url_ = false;
bool VerdictCacheManager::has_artificial_cached_url() {
return has_artificial_cached_url_;
}
void VerdictCacheManager::ResetHasArtificialCachedUrlForTesting() {
has_artificial_cached_url_ = false;
}
} // namespace safe_browsing
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