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//
//
// Copyright 2018 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.
//
//
#include <grpc/support/port_platform.h>
#include "src/core/lib/security/credentials/tls/tls_credentials.h"
#include <string>
#include <utility>
#include "absl/strings/string_view.h"
#include "absl/types/optional.h"
#include <grpc/grpc.h>
#include <grpc/grpc_security_constants.h>
#include <grpc/support/log.h>
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/gpr/useful.h"
#include "src/core/lib/security/credentials/tls/grpc_tls_certificate_verifier.h"
#include "src/core/lib/security/credentials/tls/grpc_tls_credentials_options.h"
#include "src/core/lib/security/security_connector/tls/tls_security_connector.h"
#include "src/core/tsi/ssl/session_cache/ssl_session_cache.h"
namespace {
bool CredentialOptionSanityCheck(grpc_tls_credentials_options* options,
bool is_client) {
if (options == nullptr) {
gpr_log(GPR_ERROR, "TLS credentials options is nullptr.");
return false;
}
// In the following conditions, there won't be any issues, but it might
// indicate callers are doing something wrong with the API.
if (is_client && options->cert_request_type() !=
GRPC_SSL_DONT_REQUEST_CLIENT_CERTIFICATE) {
gpr_log(GPR_ERROR,
"Client's credentials options should not set cert_request_type.");
}
if (!is_client && !options->verify_server_cert()) {
gpr_log(GPR_ERROR,
"Server's credentials options should not set verify_server_cert.");
}
// In the following conditions, there could be severe security issues.
if (is_client && options->certificate_verifier() == nullptr) {
// If no verifier is specified on the client side, use the hostname verifier
// as default. Users who want to bypass all the verifier check should
// implement an external verifier instead.
gpr_log(GPR_INFO,
"No verifier specified on the client side. Using default hostname "
"verifier");
options->set_certificate_verifier(
grpc_core::MakeRefCounted<grpc_core::HostNameCertificateVerifier>());
}
return true;
}
} // namespace
TlsCredentials::TlsCredentials(
grpc_core::RefCountedPtr<grpc_tls_credentials_options> options)
: options_(std::move(options)) {}
TlsCredentials::~TlsCredentials() {}
grpc_core::RefCountedPtr<grpc_channel_security_connector>
TlsCredentials::create_security_connector(
grpc_core::RefCountedPtr<grpc_call_credentials> call_creds,
const char* target_name, grpc_core::ChannelArgs* args) {
absl::optional<std::string> overridden_target_name =
args->GetOwnedString(GRPC_SSL_TARGET_NAME_OVERRIDE_ARG);
auto* ssl_session_cache = args->GetObject<tsi::SslSessionLRUCache>();
grpc_core::RefCountedPtr<grpc_channel_security_connector> sc =
grpc_core::TlsChannelSecurityConnector::CreateTlsChannelSecurityConnector(
this->Ref(), options_, std::move(call_creds), target_name,
overridden_target_name.has_value() ? overridden_target_name->c_str()
: nullptr,
ssl_session_cache == nullptr ? nullptr : ssl_session_cache->c_ptr());
if (sc == nullptr) {
return nullptr;
}
*args = args->Set(GRPC_ARG_HTTP2_SCHEME, "https");
return sc;
}
grpc_core::UniqueTypeName TlsCredentials::type() const {
static grpc_core::UniqueTypeName::Factory kFactory("Tls");
return kFactory.Create();
}
int TlsCredentials::cmp_impl(const grpc_channel_credentials* other) const {
const TlsCredentials* o = static_cast<const TlsCredentials*>(other);
if (*options_ == *o->options_) return 0;
return grpc_core::QsortCompare(
static_cast<const grpc_channel_credentials*>(this), other);
}
TlsServerCredentials::TlsServerCredentials(
grpc_core::RefCountedPtr<grpc_tls_credentials_options> options)
: options_(std::move(options)) {}
TlsServerCredentials::~TlsServerCredentials() {}
grpc_core::RefCountedPtr<grpc_server_security_connector>
TlsServerCredentials::create_security_connector(
const grpc_core::ChannelArgs& /* args */) {
return grpc_core::TlsServerSecurityConnector::
CreateTlsServerSecurityConnector(this->Ref(), options_);
}
grpc_core::UniqueTypeName TlsServerCredentials::type() const {
static grpc_core::UniqueTypeName::Factory kFactory("Tls");
return kFactory.Create();
}
/// -- Wrapper APIs declared in grpc_security.h -- *
grpc_channel_credentials* grpc_tls_credentials_create(
grpc_tls_credentials_options* options) {
if (!CredentialOptionSanityCheck(options, true /* is_client */)) {
return nullptr;
}
return new TlsCredentials(
grpc_core::RefCountedPtr<grpc_tls_credentials_options>(options));
}
grpc_server_credentials* grpc_tls_server_credentials_create(
grpc_tls_credentials_options* options) {
if (!CredentialOptionSanityCheck(options, false /* is_client */)) {
return nullptr;
}
return new TlsServerCredentials(
grpc_core::RefCountedPtr<grpc_tls_credentials_options>(options));
}
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