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// Copyright 2014 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/security_interstitials/content/stateful_ssl_host_state_delegate.h"
#include <stdint.h>
#include <functional>
#include <memory>
#include <optional>
#include <set>
#include <utility>
#include "base/base64.h"
#include "base/containers/contains.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/functional/callback_helpers.h"
#include "base/json/values_util.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/time/clock.h"
#include "base/time/default_clock.h"
#include "base/time/time.h"
#include "base/values.h"
#include "build/build_config.h"
#include "components/content_settings/core/browser/content_settings_pref_provider.h"
#include "components/content_settings/core/browser/host_content_settings_map.h"
#include "components/content_settings/core/common/content_settings_types.h"
#include "components/pref_registry/pref_registry_syncable.h"
#include "components/prefs/scoped_user_pref_update.h"
#include "components/security_interstitials/core/pref_names.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/storage_partition.h"
#include "net/base/hash_value.h"
#include "net/cert/x509_certificate.h"
#include "services/network/public/mojom/network_context.mojom.h"
#include "url/gurl.h"
namespace {
// Certificate error bypasses are remembered for one week.
const uint64_t kCertErrorBypassExpirationInSeconds = UINT64_C(604800);
// The expiration for HTTPS-First Mode bypasses is 15 days.
const uint64_t kHTTPSFirstModeBypassExpirationInSeconds = UINT64_C(1296000);
// Keys for the per-site error + certificate finger to judgment content
// settings map.
const char kSSLCertDecisionCertErrorMapKey[] = "cert_exceptions_map";
const char kSSLCertDecisionExpirationTimeKey[] = "decision_expiration_time";
const char kSSLCertDecisionVersionKey[] = "version";
const int kDefaultSSLCertDecisionVersion = 1;
// All SSL decisions are per host (and are shared arcoss schemes), so this
// canonicalizes all hosts into a secure scheme GURL to use with content
// settings. The returned GURL will be the passed in host with an empty path and
// https:// as the scheme.
GURL GetSecureGURLForHost(const std::string& host) {
std::string url = "https://" + host;
return GURL(url);
}
std::string GetKey(const net::X509Certificate& cert, int error) {
// Since a security decision will be made based on the fingerprint, Chrome
// should use the SHA-256 fingerprint for the certificate.
net::SHA256HashValue fingerprint = cert.CalculateChainFingerprint256();
std::string base64_fingerprint = base::Base64Encode(fingerprint);
return base::NumberToString(error) + base64_fingerprint;
}
bool HostFilterToPatternFilter(
base::OnceCallback<bool(const std::string&)> host_filter,
const ContentSettingsPattern& primary_pattern,
const ContentSettingsPattern& secondary_pattern) {
// We only ever set origin-scoped exceptions which are of the form
// "https://<host>:443". That is a valid URL, so we can compare |host_filter|
// against its host.
GURL url = GURL(primary_pattern.ToString());
DCHECK(url.is_valid());
return std::move(host_filter).Run(url.host());
}
} // namespace
StatefulSSLHostStateDelegate::StatefulSSLHostStateDelegate(
content::BrowserContext* browser_context,
HostContentSettingsMap* host_content_settings_map)
: clock_(new base::DefaultClock()),
browser_context_(browser_context),
host_content_settings_map_(host_content_settings_map),
https_only_mode_allowlist_(
host_content_settings_map,
clock_.get(),
base::Seconds(kHTTPSFirstModeBypassExpirationInSeconds)),
https_only_mode_enforcelist_(host_content_settings_map_, clock_.get()),
https_first_balanced_mode_suppressed_for_testing(false) {}
StatefulSSLHostStateDelegate::~StatefulSSLHostStateDelegate() = default;
void StatefulSSLHostStateDelegate::AllowCert(
const std::string& host,
const net::X509Certificate& cert,
int error,
content::StoragePartition* storage_partition) {
if (!storage_partition ||
storage_partition != browser_context_->GetDefaultStoragePartition()) {
// Decisions for non-default storage partitions are stored in memory only;
// see comment on declaration of
// |allowed_certs_for_non_default_storage_partitions_|.
auto allowed_cert =
AllowedCert(GetKey(cert, error), storage_partition->GetPath());
allowed_certs_for_non_default_storage_partitions_[host].insert(
allowed_cert);
return;
}
GURL url = GetSecureGURLForHost(host);
base::Value value(host_content_settings_map_->GetWebsiteSetting(
url, url, ContentSettingsType::SSL_CERT_DECISIONS, nullptr));
if (!value.is_dict())
value = base::Value(base::Value::Type::DICT);
base::Value::Dict* cert_dict =
GetValidCertDecisionsDict(CREATE_DICTIONARY_ENTRIES, value.GetDict());
// If a a valid certificate dictionary cannot be extracted from the content
// setting, that means it's in an unknown format. Unfortunately, there's
// nothing to be done in that case, so a silent fail is the only option.
if (!cert_dict)
return;
value.GetDict().Set(kSSLCertDecisionVersionKey,
kDefaultSSLCertDecisionVersion);
cert_dict->Set(GetKey(cert, error), ALLOWED);
// The map takes ownership of the value, so it is released in the call to
// SetWebsiteSettingDefaultScope.
host_content_settings_map_->SetWebsiteSettingDefaultScope(
url, GURL(), ContentSettingsType::SSL_CERT_DECISIONS, std::move(value));
}
void StatefulSSLHostStateDelegate::Clear(
base::RepeatingCallback<bool(const std::string&)> host_filter) {
// Convert host matching to content settings pattern matching. Content
// settings deletion is done synchronously on the UI thread, so we can use
// |host_filter| by reference.
HostContentSettingsMap::PatternSourcePredicate pattern_filter;
if (!host_filter.is_null()) {
pattern_filter =
base::BindRepeating(&HostFilterToPatternFilter, host_filter);
}
host_content_settings_map_->ClearSettingsForOneTypeWithPredicate(
ContentSettingsType::SSL_CERT_DECISIONS, base::Time(), base::Time::Max(),
pattern_filter);
https_only_mode_allowlist_.Clear(base::Time(), base::Time::Max(),
pattern_filter);
// This might not be necessary since the engagement score of a site will be
// cleared and the site will be removed from the enforcelist. However, there
// could be a period between clearing and navigating where the enforcelist
// would still be persisted on disk etc, so clear it explicitly.
https_only_mode_enforcelist_.Clear(base::Time(), base::Time::Max(),
pattern_filter);
}
content::SSLHostStateDelegate::CertJudgment
StatefulSSLHostStateDelegate::QueryPolicy(
const std::string& host,
const net::X509Certificate& cert,
int error,
content::StoragePartition* storage_partition) {
if (!storage_partition ||
storage_partition != browser_context_->GetDefaultStoragePartition()) {
if (allowed_certs_for_non_default_storage_partitions_.find(host) ==
allowed_certs_for_non_default_storage_partitions_.end()) {
return DENIED;
}
AllowedCert allowed_cert =
AllowedCert(GetKey(cert, error), storage_partition->GetPath());
if (base::Contains(allowed_certs_for_non_default_storage_partitions_[host],
allowed_cert)) {
return ALLOWED;
}
return DENIED;
}
GURL url = GetSecureGURLForHost(host);
base::Value value(host_content_settings_map_->GetWebsiteSetting(
url, url, ContentSettingsType::SSL_CERT_DECISIONS, nullptr));
if (!value.is_dict())
return DENIED;
base::Value::Dict* cert_error_dict = GetValidCertDecisionsDict(
DO_NOT_CREATE_DICTIONARY_ENTRIES, value.GetDict());
if (!cert_error_dict) {
// This revoke is necessary to clear any old expired setting that may be
// lingering in the case that an old decision expried.
RevokeUserAllowExceptions(host);
return DENIED;
}
std::optional<int> policy_decision =
cert_error_dict->FindInt(GetKey(cert, error));
// If a policy decision was successfully retrieved and it's a valid value of
// ALLOWED, return the valid value. Otherwise, return DENIED.
if (policy_decision.has_value() && policy_decision.value() == ALLOWED)
return ALLOWED;
return DENIED;
}
void StatefulSSLHostStateDelegate::HostRanInsecureContent(
const std::string& host,
InsecureContentType content_type) {
switch (content_type) {
case MIXED_CONTENT:
ran_mixed_content_hosts_.insert(host);
return;
case CERT_ERRORS_CONTENT:
ran_content_with_cert_errors_hosts_.insert(host);
return;
}
}
bool StatefulSSLHostStateDelegate::DidHostRunInsecureContent(
const std::string& host,
InsecureContentType content_type) {
switch (content_type) {
case MIXED_CONTENT:
return base::Contains(ran_mixed_content_hosts_, host);
case CERT_ERRORS_CONTENT:
return base::Contains(ran_content_with_cert_errors_hosts_, host);
}
NOTREACHED();
}
void StatefulSSLHostStateDelegate::AllowHttpForHost(
const std::string& host,
content::StoragePartition* storage_partition) {
bool is_nondefault_storage =
!storage_partition ||
storage_partition != browser_context_->GetDefaultStoragePartition();
https_only_mode_allowlist_.AllowHttpForHost(host, is_nondefault_storage);
}
bool StatefulSSLHostStateDelegate::IsHttpAllowedForHost(
const std::string& host,
content::StoragePartition* storage_partition) {
bool is_nondefault_storage =
!storage_partition ||
storage_partition != browser_context_->GetDefaultStoragePartition();
return https_only_mode_allowlist_.IsHttpAllowedForHost(host,
is_nondefault_storage);
}
void StatefulSSLHostStateDelegate::SetHttpsEnforcementForHost(
const std::string& host,
bool enforced,
content::StoragePartition* storage_partition) {
bool is_nondefault_storage =
!storage_partition ||
storage_partition != browser_context_->GetDefaultStoragePartition();
if (enforced) {
https_only_mode_enforcelist_.EnforceForHost(host, is_nondefault_storage);
} else {
https_only_mode_enforcelist_.UnenforceForHost(host, is_nondefault_storage);
}
}
bool StatefulSSLHostStateDelegate::IsHttpsEnforcedForUrl(
const GURL& url,
content::StoragePartition* storage_partition) {
bool is_nondefault_storage =
!storage_partition ||
storage_partition != browser_context_->GetDefaultStoragePartition();
return https_only_mode_enforcelist_.IsEnforcedForUrl(url,
is_nondefault_storage);
}
std::set<GURL> StatefulSSLHostStateDelegate::GetHttpsEnforcedHosts(
content::StoragePartition* storage_partition) const {
bool is_nondefault_storage =
!storage_partition ||
storage_partition != browser_context_->GetDefaultStoragePartition();
return https_only_mode_enforcelist_.GetHosts(is_nondefault_storage);
}
void StatefulSSLHostStateDelegate::ClearHttpsOnlyModeAllowlist() {
https_only_mode_allowlist_.ClearAllowlist(base::Time(), base::Time::Max());
}
void StatefulSSLHostStateDelegate::ClearHttpsEnforcelist() {
https_only_mode_enforcelist_.ClearEnforcements(base::Time(),
base::Time::Max());
}
void StatefulSSLHostStateDelegate::RevokeUserAllowExceptions(
const std::string& host) {
GURL url = GetSecureGURLForHost(host);
host_content_settings_map_->SetWebsiteSettingDefaultScope(
url, GURL(), ContentSettingsType::SSL_CERT_DECISIONS, base::Value());
// Decisions for non-default storage partitions are stored separately in
// memory; delete those as well.
allowed_certs_for_non_default_storage_partitions_.erase(host);
https_only_mode_allowlist_.RevokeUserAllowExceptions(host);
https_only_mode_enforcelist_.RevokeEnforcements(host);
}
bool StatefulSSLHostStateDelegate::HasAllowException(
const std::string& host,
content::StoragePartition* storage_partition) {
return HasCertAllowException(host, storage_partition) ||
IsHttpAllowedForHost(host, storage_partition);
}
bool StatefulSSLHostStateDelegate::HasAllowExceptionForAnyHost(
content::StoragePartition* storage_partition) {
return HasCertAllowExceptionForAnyHost(storage_partition) ||
IsHttpAllowedForAnyHost(storage_partition);
}
bool StatefulSSLHostStateDelegate::HasCertAllowExceptionForAnyHost(
content::StoragePartition* storage_partition) {
if (!storage_partition ||
storage_partition != browser_context_->GetDefaultStoragePartition()) {
return !allowed_certs_for_non_default_storage_partitions_.empty();
}
ContentSettingsForOneType content_settings_list =
host_content_settings_map_->GetSettingsForOneType(
ContentSettingsType::SSL_CERT_DECISIONS);
return !content_settings_list.empty();
}
bool StatefulSSLHostStateDelegate::IsHttpAllowedForAnyHost(
content::StoragePartition* storage_partition) {
bool is_nondefault_storage =
!storage_partition ||
storage_partition != browser_context_->GetDefaultStoragePartition();
return https_only_mode_allowlist_.IsHttpAllowedForAnyHost(
is_nondefault_storage);
}
// TODO(jww): This will revoke all of the decisions in the browser context.
// However, the networking stack actually keeps track of its own list of
// exceptions per-HttpNetworkTransaction in the SSLConfig structure (see the
// allowed_bad_certs Vector in net/ssl/ssl_config.h). This dual-tracking of
// exceptions introduces a problem where the browser context can revoke a
// certificate, but if a transaction reuses a cached version of the SSLConfig
// (probably from a pooled socket), it may bypass the intestitial layer.
//
// Over time, the cached versions should expire and it should converge on
// showing the interstitial. We probably need to introduce into the networking
// stack a way revoke SSLConfig's allowed_bad_certs lists per socket.
//
// For now, RevokeUserAllowExceptionsHard is our solution for the rare case
// where it is necessary to revoke the preferences immediately. It does so by
// flushing idle sockets, thus it is a big hammer and should be wielded with
// extreme caution as it can have a big, negative impact on network performance.
void StatefulSSLHostStateDelegate::RevokeUserAllowExceptionsHard(
const std::string& host) {
RevokeUserAllowExceptions(host);
auto* network_context =
browser_context_->GetDefaultStoragePartition()->GetNetworkContext();
network_context->CloseIdleConnections(base::NullCallback());
}
bool StatefulSSLHostStateDelegate::
HttpsFirstBalancedModeSuppressedForTesting() {
return https_first_balanced_mode_suppressed_for_testing;
}
void StatefulSSLHostStateDelegate::
SetHttpsFirstBalancedModeSuppressedForTesting(bool suppressed) {
https_first_balanced_mode_suppressed_for_testing = suppressed;
}
void StatefulSSLHostStateDelegate::SetClockForTesting(
std::unique_ptr<base::Clock> clock) {
// Pointers to the existing Clock object must be reset before swapping the
// underlying Clock object, otherwise they are dangling (briefly).
https_only_mode_allowlist_.SetClockForTesting(nullptr); // IN-TEST
https_only_mode_enforcelist_.SetClockForTesting(nullptr); // IN-TEST
clock_ = std::move(clock);
https_only_mode_allowlist_.SetClockForTesting(clock_.get()); // IN-TEST
https_only_mode_enforcelist_.SetClockForTesting(clock_.get()); // IN-TEST
}
bool StatefulSSLHostStateDelegate::HasCertAllowException(
const std::string& host,
content::StoragePartition* storage_partition) {
if (!storage_partition ||
storage_partition != browser_context_->GetDefaultStoragePartition()) {
return base::Contains(allowed_certs_for_non_default_storage_partitions_,
host);
}
GURL url = GetSecureGURLForHost(host);
const ContentSettingsPattern pattern =
ContentSettingsPattern::FromURLNoWildcard(url);
const base::Value value(host_content_settings_map_->GetWebsiteSetting(
url, url, ContentSettingsType::SSL_CERT_DECISIONS, nullptr));
if (!value.is_dict())
return false;
for (const auto pair : value.GetDict()) {
if (!pair.second.is_int())
continue;
if (static_cast<CertJudgment>(pair.second.GetInt()) == ALLOWED)
return true;
}
return false;
}
// This helper function gets the dictionary of certificate fingerprints to
// errors of certificates that have been accepted by the user from the content
// dictionary that has been passed in. The returned pointer is owned by the the
// argument dict that is passed in.
//
// If create_entries is set to |DO_NOT_CREATE_DICTIONARY_ENTRIES|,
// GetValidCertDecisionsDict will return nullptr if there is anything invalid
// about the setting, such as an invalid version or invalid value types (in
// addition to there not being any values in the dictionary). If create_entries
// is set to |CREATE_DICTIONARY_ENTRIES|, if no dictionary is found or the
// decisions are expired, a new dictionary will be created.
base::Value::Dict* StatefulSSLHostStateDelegate::GetValidCertDecisionsDict(
CreateDictionaryEntriesDisposition create_entries,
base::Value::Dict& dict) {
// Extract the version of the certificate decision structure from the content
// setting.
std::optional<int> version = dict.FindInt(kSSLCertDecisionVersionKey);
if (!version) {
if (create_entries == DO_NOT_CREATE_DICTIONARY_ENTRIES)
return nullptr;
dict.Set(kSSLCertDecisionVersionKey, kDefaultSSLCertDecisionVersion);
version = std::make_optional<int>(kDefaultSSLCertDecisionVersion);
}
// If the version is somehow a newer version than Chrome can handle, there's
// really nothing to do other than fail silently and pretend it doesn't exist
// (or is malformed).
if (*version > kDefaultSSLCertDecisionVersion) {
LOG(ERROR) << "Failed to parse a certificate error exception that is in a "
<< "newer version format (" << *version << ") than is supported"
<< "(" << kDefaultSSLCertDecisionVersion << ")";
return nullptr;
}
// Extract the certificate decision's expiration time from the content
// setting. If there is no expiration time, that means it should never expire
// and it should reset only at session restart, so skip all of the expiration
// checks.
bool expired = false;
base::Time now = clock_->Now();
auto* decision_expiration_value =
dict.Find(kSSLCertDecisionExpirationTimeKey);
auto decision_expiration = base::ValueToTime(decision_expiration_value);
// Check to see if the user's certificate decision has expired.
// - Expired and |create_entries| is DO_NOT_CREATE_DICTIONARY_ENTRIES, return
// nullptr.
// - Expired and |create_entries| is CREATE_DICTIONARY_ENTRIES, update the
// expiration time.
if (decision_expiration <= now) {
if (create_entries == DO_NOT_CREATE_DICTIONARY_ENTRIES)
return nullptr;
expired = true;
base::Time expiration_time =
now + base::Seconds(kCertErrorBypassExpirationInSeconds);
// Unfortunately, JSON (and thus content settings) doesn't support int64_t
// values, only doubles. Since this mildly depends on precision, it is
// better to store the value as a string.
dict.Set(kSSLCertDecisionExpirationTimeKey,
base::TimeToValue(expiration_time));
}
// Extract the map of certificate fingerprints to errors from the setting.
base::Value::Dict* cert_error_dict =
dict.FindDict(kSSLCertDecisionCertErrorMapKey);
if (expired || !cert_error_dict) {
if (create_entries == DO_NOT_CREATE_DICTIONARY_ENTRIES)
return nullptr;
cert_error_dict = dict.EnsureDict(kSSLCertDecisionCertErrorMapKey);
cert_error_dict->clear();
}
return cert_error_dict;
}
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