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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 "chrome/browser/enterprise/data_controls/chrome_dlp_rules_manager.h"
#include "base/feature_list.h"
#include "base/notreached.h"
#include "chrome/browser/profiles/profile.h"
#include "components/enterprise/data_controls/core/browser/features.h"
#include "components/enterprise/data_controls/core/browser/prefs.h"
#include "components/prefs/pref_service.h"
#include "url/origin.h"
namespace data_controls {
namespace {
using Level = DlpRulesManagerBase::Level;
using RuleId = ChromeDlpRulesManager::RuleId;
using UrlConditionId = ChromeDlpRulesManager::UrlConditionId;
using RulesConditionsMap = std::map<RuleId, UrlConditionId>;
constexpr char kWildCardMatching[] = "*";
} // namespace
ChromeDlpRulesManager::ChromeDlpRulesManager(Profile* profile)
: profile_(profile) {
DCHECK(profile_);
}
ChromeDlpRulesManager::~ChromeDlpRulesManager() = default;
Level ChromeDlpRulesManager::IsRestricted(const GURL& source,
Restriction restriction) const {
DCHECK(src_url_matcher_);
DCHECK(restriction == Restriction::kPrinting ||
restriction == Restriction::kPrivacyScreen ||
restriction == Restriction::kScreenshot ||
restriction == Restriction::kScreenShare);
const RulesConditionsMap src_rules_map = MatchUrlAndGetRulesMapping(
source, src_url_matcher_.get(), src_url_rules_mapping_);
return GetMaxJoinRestrictionLevelAndRuleId(restriction, src_rules_map,
restrictions_map_)
.level;
}
Level ChromeDlpRulesManager::IsRestrictedByAnyRule(
const GURL& source,
Restriction restriction,
std::string* out_source_pattern,
RuleMetadata* out_rule_metadata) const {
DCHECK(src_url_matcher_);
const RulesConditionsMap src_rules_map = MatchUrlAndGetRulesMapping(
source, src_url_matcher_.get(), src_url_rules_mapping_);
const MatchedRuleInfo rule_info = GetMaxJoinRestrictionLevelAndRuleId(
restriction, src_rules_map, restrictions_map_,
/*ignore_allow=*/true);
if (rule_info.url_condition.has_value() && out_source_pattern) {
UrlConditionId src_condition_id = rule_info.url_condition.value();
*out_source_pattern = src_patterns_mapping_.at(src_condition_id);
}
if (rule_info.rule_id.has_value() && out_rule_metadata) {
auto rule_metadata_itr =
rules_id_metadata_mapping_.find(rule_info.rule_id.value());
if (rule_metadata_itr != rules_id_metadata_mapping_.end()) {
*out_rule_metadata = rule_metadata_itr->second;
}
}
return rule_info.level;
}
Level ChromeDlpRulesManager::IsRestrictedDestination(
const GURL& source,
const GURL& destination,
Restriction restriction,
std::string* out_source_pattern,
std::string* out_destination_pattern,
RuleMetadata* out_rule_metadata) const {
DCHECK(src_url_matcher_);
DCHECK(dst_url_matcher_);
DCHECK(restriction == Restriction::kClipboard ||
restriction == Restriction::kFiles);
// Allow copy/paste within the same document.
if (url::IsSameOriginWith(source, destination)) {
return Level::kAllow;
}
const RulesConditionsMap src_rules_map = MatchUrlAndGetRulesMapping(
source, src_url_matcher_.get(), src_url_rules_mapping_);
const RulesConditionsMap dst_rules_map = MatchUrlAndGetRulesMapping(
destination, dst_url_matcher_.get(), dst_url_rules_mapping_);
std::map<RuleId, std::pair<UrlConditionId, UrlConditionId>>
intersection_rules;
auto src_map_itr = src_rules_map.begin();
auto dst_map_itr = dst_rules_map.begin();
while (src_map_itr != src_rules_map.end() &&
dst_map_itr != dst_rules_map.end()) {
if (src_map_itr->first < dst_map_itr->first) {
++src_map_itr;
} else if (dst_map_itr->first < src_map_itr->first) {
++dst_map_itr;
} else {
intersection_rules.insert(std::make_pair(
src_map_itr->first,
std::make_pair(src_map_itr->second, dst_map_itr->second)));
++src_map_itr;
++dst_map_itr;
}
}
const MatchedRuleInfo rule_info = GetMaxJoinRestrictionLevelAndRuleId(
restriction, intersection_rules, restrictions_map_);
if (rule_info.url_condition.has_value() && out_source_pattern) {
UrlConditionId src_condition_id = rule_info.url_condition.value().first;
UrlConditionId dst_condition_id = rule_info.url_condition.value().second;
if (out_source_pattern) {
*out_source_pattern = src_patterns_mapping_.at(src_condition_id);
}
if (out_destination_pattern) {
*out_destination_pattern = dst_patterns_mapping_.at(dst_condition_id);
}
if (rule_info.rule_id.has_value() && out_rule_metadata) {
auto rule_metadata_itr =
rules_id_metadata_mapping_.find(rule_info.rule_id.value());
if (rule_metadata_itr != rules_id_metadata_mapping_.end()) {
*out_rule_metadata = rule_metadata_itr->second;
}
}
}
return rule_info.level;
}
DlpRulesManagerBase::AggregatedDestinations
ChromeDlpRulesManager::GetAggregatedDestinations(
const GURL& source,
Restriction restriction) const {
DCHECK(src_url_matcher_);
DCHECK(dst_url_matcher_);
DCHECK(restriction == Restriction::kClipboard ||
restriction == Restriction::kFiles);
auto restriction_it = restrictions_map_.find(restriction);
if (restriction_it == restrictions_map_.end()) {
return std::map<Level, std::set<std::string>>();
}
const std::map<RuleId, Level>& restriction_rules = restriction_it->second;
const RulesConditionsMap src_rules_map = MatchUrlAndGetRulesMapping(
source, src_url_matcher_.get(), src_url_rules_mapping_);
// We need to check all possible destinations for rules that apply to it and
// to the `source`. There can be many matching rules, but we want to keep only
// the highest enforced level for each destination.
std::map<std::string, Level> destination_level_map;
// If there's a wildcard for a level, we should ignore all destinations for
// lower levels.
Level wildcard_level = Level::kNotSet;
for (auto dst_map_itr : dst_url_rules_mapping_) {
auto src_map_itr = src_rules_map.find(dst_map_itr.second);
if (src_map_itr == src_rules_map.end()) {
continue;
}
const auto& restriction_rule_itr =
restriction_rules.find(src_map_itr->first);
if (restriction_rule_itr == restriction_rules.end()) {
continue;
}
UrlConditionId dst_condition_id = dst_map_itr.first;
std::string destination_pattern =
dst_patterns_mapping_.at(dst_condition_id);
Level level = restriction_rule_itr->second;
auto it = destination_level_map.find(destination_pattern);
if (it == destination_level_map.end() || level > it->second) {
destination_level_map[destination_pattern] = restriction_rule_itr->second;
}
if (destination_pattern == kWildCardMatching && level > wildcard_level) {
wildcard_level = level;
}
}
std::map<Level, std::set<std::string>> result;
for (const auto& it : destination_level_map) {
if (it.first == kWildCardMatching) {
result[it.second] = {it.first};
} else if (it.second >= wildcard_level &&
result[it.second].find(kWildCardMatching) ==
result[it.second].end()) {
result[it.second].insert(it.first);
}
}
return result;
}
std::string ChromeDlpRulesManager::GetSourceUrlPattern(
const GURL& source_url,
Restriction restriction,
Level level,
RuleMetadata* out_rule_metadata) const {
const std::set<UrlConditionId> url_conditions_ids =
src_url_matcher_->MatchURL(source_url);
std::map<RuleId, UrlConditionId> rules_conditions_map;
for (const auto& condition_id : url_conditions_ids) {
rules_conditions_map.insert(
std::make_pair(src_url_rules_mapping_.at(condition_id), condition_id));
}
auto restriction_itr = restrictions_map_.find(restriction);
if (restriction_itr == restrictions_map_.end()) {
return std::string();
}
const auto rules_levels_map = restriction_itr->second;
for (const auto& rule_level_entry : rules_levels_map) {
auto rule_id = rule_level_entry.first;
auto lvl = rule_level_entry.second;
auto rule_condition_itr = rules_conditions_map.find(rule_id);
if (lvl == level && rule_condition_itr != rules_conditions_map.end()) {
auto condition_id = rule_condition_itr->second;
auto condition_pattern_itr = src_patterns_mapping_.find(condition_id);
if (condition_pattern_itr != src_patterns_mapping_.end()) {
if (out_rule_metadata) {
auto rule_metadata_itr = rules_id_metadata_mapping_.find(rule_id);
if (rule_metadata_itr != rules_id_metadata_mapping_.end()) {
*out_rule_metadata = rule_metadata_itr->second;
}
}
return condition_pattern_itr->second;
}
}
}
return std::string();
}
// static
RulesConditionsMap ChromeDlpRulesManager::MatchUrlAndGetRulesMapping(
const GURL& url,
const url_matcher::URLMatcher* url_matcher,
const std::map<UrlConditionId, RuleId>& rules_map) {
DCHECK(url_matcher);
const std::set<UrlConditionId> url_conditions_ids =
url_matcher->MatchURL(url);
RulesConditionsMap rules_conditions_map;
for (const auto& id : url_conditions_ids) {
rules_conditions_map[rules_map.at(id)] = id;
}
return rules_conditions_map;
}
template <typename T>
ChromeDlpRulesManager::MatchedRuleInfo<T>
ChromeDlpRulesManager::GetMaxJoinRestrictionLevelAndRuleId(
const Restriction restriction,
const std::map<RuleId, T>& selected_rules,
const std::map<Restriction, std::map<RuleId, Level>>& restrictions_map,
const bool ignore_allow) const {
auto restriction_it = restrictions_map.find(restriction);
if (restriction_it == restrictions_map.end()) {
return MatchedRuleInfo<T>(Level::kAllow, std::nullopt, std::nullopt);
}
const std::map<RuleId, Level>& restriction_rules = restriction_it->second;
Level max_level = Level::kNotSet;
std::optional<T> url_condition = std::nullopt;
std::optional<RuleId> matched_rule_id = std::nullopt;
for (const auto& rule_pair : selected_rules) {
const auto& restriction_rule_itr = restriction_rules.find(rule_pair.first);
if (restriction_rule_itr == restriction_rules.end()) {
continue;
}
if (ignore_allow && restriction_rule_itr->second == Level::kAllow) {
continue;
}
if (restriction_rule_itr->second > max_level) {
max_level = restriction_rule_itr->second;
url_condition = rule_pair.second;
matched_rule_id = rule_pair.first;
}
}
if (max_level == Level::kNotSet) {
return MatchedRuleInfo<T>(Level::kAllow, std::nullopt, std::nullopt);
}
return MatchedRuleInfo(max_level, matched_rule_id, url_condition);
}
void ChromeDlpRulesManager::OnDataLeakPreventionRulesUpdate() {
// Not supported on non-CrOS platforms, see
// `DlpRulesManagerImpl::OnDataLeakPreventionRulesUpdate()` for the CrOS
// implementation.
NOTREACHED();
}
} // namespace data_controls
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