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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/ssl/https_upgrades_util.h"
#include "base/feature_list.h"
#include "base/values.h"
#include "chrome/browser/ssl/chrome_security_blocking_page_factory.h"
#include "chrome/browser/ssl/https_upgrades_interceptor.h"
#include "chrome/common/chrome_features.h"
#include "chrome/common/pref_names.h"
#include "components/content_settings/core/common/content_settings_pattern.h"
#include "components/prefs/pref_service.h"
#include "components/security_interstitials/core/https_only_mode_metrics.h"
#include "net/base/url_util.h"
#include "url/gurl.h"
using HttpInterstitialState =
security_interstitials::https_only_mode::HttpInterstitialState;
bool IsHostnameInHttpAllowlist(const GURL& url, PrefService* prefs) {
const base::Value::List& allowed_hosts =
prefs->GetList(prefs::kHttpAllowlist);
// Though this is not technically a Content Setting, ContentSettingsPattern
// aligns better than URLMatcher with the rules from
// https://chromeenterprise.google/policies/url-patterns/.
for (const auto& value : allowed_hosts) {
if (!value.is_string()) {
continue;
}
auto pattern = ContentSettingsPattern::FromString(value.GetString());
// Blanket host wildcard patterns are not allowed (matching every host),
// because admins should instead explicitly disable upgrades using the
// HttpsOnlyMode policy.
if (pattern.IsValid() && !pattern.MatchesAllHosts() &&
pattern.Matches(url)) {
return true;
}
}
return false;
}
void AllowHttpForHostnamesForTesting(const std::vector<std::string>& hostnames,
PrefService* prefs) {
DCHECK(prefs->GetList(prefs::kHttpAllowlist).empty());
base::Value::List allowed_hosts;
for (const std::string& hostname : hostnames) {
allowed_hosts.Append(hostname);
}
prefs->SetList(prefs::kHttpAllowlist, std::move(allowed_hosts));
}
void ClearHttpAllowlistForHostnamesForTesting(PrefService* prefs) {
base::Value::List empty_list;
prefs->SetList(prefs::kHttpAllowlist, std::move(empty_list));
}
bool IsBalancedModeAvailable() {
return base::FeatureList::IsEnabled(features::kHttpsFirstBalancedMode);
}
bool IsBalancedModeEnabled(PrefService* prefs) {
if (!prefs || !IsBalancedModeAvailable()) {
return false;
}
bool user_has_modified_settings =
prefs->HasPrefPath(prefs::kHttpsOnlyModeEnabled) ||
prefs->HasPrefPath(prefs::kHttpsFirstBalancedMode);
if (!user_has_modified_settings) {
return base::FeatureList::IsEnabled(
features::kHttpsFirstBalancedModeAutoEnable);
}
return prefs->GetBoolean(prefs::kHttpsFirstBalancedMode);
}
bool IsBalancedModeInterstitialEnabledByHeuristics(
const HttpInterstitialState& state) {
return IsBalancedModeAvailable() &&
(state.enabled_by_engagement_heuristic ||
state.enabled_by_typically_secure_browsing);
}
bool IsBalancedModeUniquelyEnabled(const HttpInterstitialState& state) {
// Balance mode is _uniquely_ enabled only when other HFM variants aren't
// enabled.
if (state.enabled_by_pref) {
return false;
}
if (base::FeatureList::IsEnabled(features::kHttpsFirstModeIncognito) &&
state.enabled_by_incognito) {
return false;
}
// ...then ensure balanced mode is enabled.
return (IsBalancedModeAvailable() && state.enabled_in_balanced_mode) ||
IsBalancedModeInterstitialEnabledByHeuristics(state);
}
bool IsInterstitialEnabled(const HttpInterstitialState& state) {
// Interstitials are enabled when "strict" interstitials are enabled...
if (IsStrictInterstitialEnabled(state)) {
return true;
}
if (IsBalancedModeAvailable() && state.enabled_in_balanced_mode) {
return true;
}
return IsBalancedModeInterstitialEnabledByHeuristics(state);
}
bool IsStrictInterstitialEnabled(const HttpInterstitialState& state) {
if (state.enabled_by_pref) {
return true;
}
if (base::FeatureList::IsEnabled(features::kHttpsFirstModeIncognito) &&
state.enabled_by_incognito) {
return true;
}
return false;
}
bool ShouldExemptNonUniqueHostnames(const HttpInterstitialState& state) {
// If strict mode is enabled by the pref, warn the user before any HTTP that
// goes over the network. Any other mode ignores non-unique hostnames.
return !state.enabled_by_pref;
}
bool ShouldExcludeUrlFromInterstitial(const HttpInterstitialState& state,
const GURL& url) {
// In balanced mode, single-label hostnames and URLs with non-default ports
// are excluded from interstitials. This also applies if one of the HFM
// heuristics enabled Balanced Mode.
return IsBalancedModeUniquelyEnabled(state) &&
(net::GetSuperdomain(url.host()).empty() ||
(url.has_port() &&
url.IntPort() != HttpsUpgradesInterceptor::GetHttpPortForTesting()));
}
bool MustDisableSiteEngagementHeuristic(Profile* profile) {
return !base::FeatureList::IsEnabled(
features::kHttpsFirstModeV2ForEngagedSites) ||
!IsBalancedModeAvailable() ||
ChromeSecurityBlockingPageFactory::IsEnterpriseManaged(profile);
}
bool MustDisableTypicallySecureUserHeuristic(Profile* profile) {
return !base::FeatureList::IsEnabled(
features::kHttpsFirstModeV2ForTypicallySecureUsers) ||
!IsBalancedModeAvailable() ||
ChromeSecurityBlockingPageFactory::IsEnterpriseManaged(profile);
}
void RecordHttpsFirstModeUKM(
ukm::SourceId source_id,
security_interstitials::https_only_mode::BlockingResult result) {
if (source_id == ukm::kInvalidSourceId) {
return;
}
ukm::UkmRecorder* ukm_recorder = ukm::UkmRecorder::Get();
CHECK(ukm_recorder);
ukm::builders::HttpsFirstMode_Event(source_id)
.SetResult(static_cast<int>(result))
.Record(ukm_recorder);
}
ScopedAllowHttpForHostnamesForTesting::ScopedAllowHttpForHostnamesForTesting(
const std::vector<std::string>& hostnames,
PrefService* prefs)
: prefs_(prefs) {
AllowHttpForHostnamesForTesting(hostnames, prefs);
}
ScopedAllowHttpForHostnamesForTesting::
~ScopedAllowHttpForHostnamesForTesting() {
ClearHttpAllowlistForHostnamesForTesting(prefs_);
}
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