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//
//
// Copyright 2020 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//
#ifndef GRPC_CORE_EXT_XDS_XDS_CERTIFICATE_PROVIDER_H
#define GRPC_CORE_EXT_XDS_XDS_CERTIFICATE_PROVIDER_H
#include <grpc/support/port_platform.h>
#include "src/core/ext/xds/xds_api.h"
#include "src/core/lib/security/credentials/tls/grpc_tls_certificate_provider.h"
#define GRPC_ARG_XDS_CERTIFICATE_PROVIDER \
"grpc.internal.xds_certificate_provider"
namespace grpc_core {
class XdsCertificateProvider : public grpc_tls_certificate_provider {
public:
XdsCertificateProvider(
absl::string_view root_cert_name,
RefCountedPtr<grpc_tls_certificate_distributor> root_cert_distributor,
absl::string_view identity_cert_name,
RefCountedPtr<grpc_tls_certificate_distributor> identity_cert_distributor,
std::vector<XdsApi::StringMatcher> san_matchers);
~XdsCertificateProvider() override;
void UpdateRootCertNameAndDistributor(
absl::string_view root_cert_name,
RefCountedPtr<grpc_tls_certificate_distributor> root_cert_distributor);
void UpdateIdentityCertNameAndDistributor(
absl::string_view identity_cert_name,
RefCountedPtr<grpc_tls_certificate_distributor>
identity_cert_distributor);
void UpdateSubjectAlternativeNameMatchers(
std::vector<XdsApi::StringMatcher> matchers);
grpc_core::RefCountedPtr<grpc_tls_certificate_distributor> distributor()
const override {
return distributor_;
}
bool ProvidesRootCerts() {
MutexLock lock(&mu_);
return root_cert_distributor_ != nullptr;
}
bool ProvidesIdentityCerts() {
MutexLock lock(&mu_);
return identity_cert_distributor_ != nullptr;
}
std::vector<XdsApi::StringMatcher> subject_alternative_name_matchers() {
MutexLock lock(&san_matchers_mu_);
return san_matchers_;
}
grpc_arg MakeChannelArg() const;
static RefCountedPtr<XdsCertificateProvider> GetFromChannelArgs(
const grpc_channel_args* args);
private:
void WatchStatusCallback(std::string cert_name, bool root_being_watched,
bool identity_being_watched);
void UpdateRootCertWatcher(
grpc_tls_certificate_distributor* root_cert_distributor);
void UpdateIdentityCertWatcher(
grpc_tls_certificate_distributor* identity_cert_distributor);
Mutex mu_;
// Use a separate mutex for san_matchers_ to avoid deadlocks since
// san_matchers_ needs to be accessed when a handshake is being done and we
// run into a possible deadlock scenario if using the same mutex. The mutex
// deadlock cycle is formed as -
// WatchStatusCallback() -> SetKeyMaterials() ->
// TlsChannelSecurityConnector::TlsChannelCertificateWatcher::OnCertificatesChanged()
// -> HandshakeManager::Add() -> SecurityHandshaker::DoHandshake() ->
// subject_alternative_names_matchers()
Mutex san_matchers_mu_;
bool watching_root_certs_ = false;
bool watching_identity_certs_ = false;
std::string root_cert_name_;
std::string identity_cert_name_;
RefCountedPtr<grpc_tls_certificate_distributor> root_cert_distributor_;
RefCountedPtr<grpc_tls_certificate_distributor> identity_cert_distributor_;
std::vector<XdsApi::StringMatcher> san_matchers_;
RefCountedPtr<grpc_tls_certificate_distributor> distributor_;
grpc_tls_certificate_distributor::TlsCertificatesWatcherInterface*
root_cert_watcher_ = nullptr;
grpc_tls_certificate_distributor::TlsCertificatesWatcherInterface*
identity_cert_watcher_ = nullptr;
};
} // namespace grpc_core
#endif // GRPC_CORE_EXT_XDS_XDS_CERTIFICATE_PROVIDER_H
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