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// Copyright 2013 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/policy/networking/policy_cert_service.h"
#include "base/files/file_path.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/functional/callback_helpers.h"
#include "base/logging.h"
#include "base/memory/ptr_util.h"
#include "chrome/browser/extensions/extension_util.h"
#include "chrome/browser/net/nss_temp_certs_cache_chromeos.h"
#include "chrome/browser/net/profile_network_context_service.h"
#include "chrome/browser/net/profile_network_context_service_factory.h"
#include "chrome/browser/policy/networking/policy_cert_service_factory.h"
#include "chrome/browser/profiles/profile.h"
#include "chromeos/ash/components/network/policy_certificate_provider.h"
#include "chromeos/components/onc/certificate_scope.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/storage_partition.h"
#include "extensions/browser/extension_util.h"
#include "net/cert/x509_certificate.h"
#include "url/gurl.h"
namespace policy {
PolicyCertService::~PolicyCertService() = default;
PolicyCertService::PolicyCertService(
Profile* profile,
ash::PolicyCertificateProvider* policy_certificate_provider,
bool may_use_profile_wide_trust_anchors)
: profile_(profile),
policy_certificate_provider_(policy_certificate_provider),
may_use_profile_wide_trust_anchors_(may_use_profile_wide_trust_anchors) {
CHECK(policy_certificate_provider_);
CHECK(profile_);
}
PolicyCertService::PolicyCertService(Profile* profile)
: profile_(profile),
policy_certificate_provider_(nullptr),
may_use_profile_wide_trust_anchors_(true) {}
void PolicyCertService::StartObservingCertChanges(
base::RepeatingClosure callback) {
CHECK(policy_certificate_provider_);
CHECK(callback);
on_policy_provided_certs_changed_callback_ = std::move(callback);
policy_certificate_provider_->AddPolicyProvidedCertsObserver(this);
profile_wide_all_server_and_authority_certs_ =
policy_certificate_provider_->GetAllServerAndAuthorityCertificates(
chromeos::onc::CertificateScope::Default());
profile_wide_trust_anchors_ = GetAllowedProfileWideTrustAnchors();
}
void PolicyCertService::StopObservingCertChanges() {
// If `on_policy_provided_certs_changed_callback_` is not set then the
// observer was never added or has already been removed.
if (!on_policy_provided_certs_changed_callback_) {
return;
}
CHECK(policy_certificate_provider_);
policy_certificate_provider_->RemovePolicyProvidedCertsObserver(this);
on_policy_provided_certs_changed_callback_.Reset();
}
void PolicyCertService::OnPolicyProvidedCertsChanged() {
CHECK(policy_certificate_provider_);
profile_wide_all_server_and_authority_certs_ =
policy_certificate_provider_->GetAllServerAndAuthorityCertificates(
chromeos::onc::CertificateScope::Default());
profile_wide_trust_anchors_ = GetAllowedProfileWideTrustAnchors();
// Make all policy-provided server and authority certificates available to NSS
// as temp certificates.
// While the network service is out-of-process so it is not affected by this,
// this is important for client certificate selection which still happens in
// the browser process.
// Note that this is done on the UI thread because the assumption is that NSS
// has already been initialized by Chrome OS specific start-up code in chrome,
// expecting that the operation of creating in-memory NSS certs is cheap in
// that case.
temp_policy_provided_certs_ =
std::make_unique<network::NSSTempCertsCacheChromeOS>(
profile_wide_all_server_and_authority_certs_);
if (on_policy_provided_certs_changed_callback_) {
on_policy_provided_certs_changed_callback_.Run();
}
}
void PolicyCertService::OnPolicyCertificateProviderDestroying() {
StopObservingCertChanges();
// Set our PolicyCertificateProvider pointer to null so that it doesn't become
// dangling.
policy_certificate_provider_ = nullptr;
}
void PolicyCertService::GetPolicyCertificatesForStoragePartition(
const base::FilePath& partition_path,
net::CertificateList* out_all_server_and_authority_certificates,
net::CertificateList* out_trust_anchors) const {
*out_all_server_and_authority_certificates =
profile_wide_all_server_and_authority_certs_;
*out_trust_anchors = profile_wide_trust_anchors_;
CHECK(policy_certificate_provider_);
if (policy_certificate_provider_->GetExtensionIdsWithPolicyCertificates()
.empty()) {
return;
}
// The following code adds policy-provided extension specific certificates.
// Policy can specify these keyed by extension ID.
// In general, there is no direct mapping from a StoragePartition path to an
// extension ID, because extensions could be using the default
// StoragePartition of the Profile.
// However, for extensions with isolated storage, the extension will be in a
// StoragePartition that is exclusively used by this extension.
// Policy-provided extension specific certificates are thus only allowed for
// extensions with isolated storage.
// The following code checks those preconditions and attempts to find the
// extension ID (among extensions IDs with policy-provided certificates) that
// corresponds to |partition_path|.
base::FilePath default_storage_partition_path =
profile_->GetDefaultStoragePartition()->GetPath();
// Among the extension IDs that have policy-provided certificates, attempt to
// find the extension ID which corresponds to |partition_path|.
// This is done by iterating the extension IDs because there's no trivial
// conversion from |partition_path| to extension ID as explained above.
std::string current_extension_id_with_policy_certificates;
std::set<std::string> extension_ids_with_policy_certificates =
policy_certificate_provider_->GetExtensionIdsWithPolicyCertificates();
for (const auto& extension_id : extension_ids_with_policy_certificates) {
// Only allow policy-provided certificates for extensions with isolated
// storage. Also sanity-check that it's not the default partition.
content::StoragePartition* extension_partition =
extensions::util::GetStoragePartitionForExtensionId(
extension_id, profile_,
/*can_create=*/false);
if (!extension_partition) {
continue;
}
if (!extensions::util::HasIsolatedStorage(extension_id, profile_) ||
extension_partition->GetPath() == default_storage_partition_path) {
LOG(ERROR) << "Ignoring policy certificates for " << extension_id
<< " because it does not have isolated storage";
continue;
}
if (partition_path == extension_partition->GetPath()) {
current_extension_id_with_policy_certificates = extension_id;
break;
}
}
if (current_extension_id_with_policy_certificates.empty()) {
return;
}
net::CertificateList extension_all_server_and_authority_certificates =
policy_certificate_provider_->GetAllServerAndAuthorityCertificates(
chromeos::onc::CertificateScope::ForExtension(
current_extension_id_with_policy_certificates));
out_all_server_and_authority_certificates->insert(
out_all_server_and_authority_certificates->end(),
extension_all_server_and_authority_certificates.begin(),
extension_all_server_and_authority_certificates.end());
net::CertificateList extension_trust_anchors =
policy_certificate_provider_->GetWebTrustedCertificates(
chromeos::onc::CertificateScope::ForExtension(
current_extension_id_with_policy_certificates));
out_trust_anchors->insert(out_trust_anchors->end(),
extension_trust_anchors.begin(),
extension_trust_anchors.end());
}
net::CertificateList PolicyCertService::GetAllowedProfileWideTrustAnchors() {
if (!may_use_profile_wide_trust_anchors_) {
return {};
}
CHECK(policy_certificate_provider_);
return policy_certificate_provider_->GetWebTrustedCertificates(
chromeos::onc::CertificateScope::Default());
}
// static
std::unique_ptr<PolicyCertService> PolicyCertService::CreateForTesting(
Profile* profile) {
return base::WrapUnique(new PolicyCertService(profile));
}
void PolicyCertService::SetPolicyTrustAnchorsForTesting(
const net::CertificateList& trust_anchors) {
// Only allow this call in an instance that has been created through
// PolicyCertService::CreateForTesting.
CHECK_EQ(nullptr, policy_certificate_provider_);
profile_wide_all_server_and_authority_certs_ = trust_anchors;
profile_wide_trust_anchors_ = trust_anchors;
}
} // namespace policy
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