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CASEServer.cpp
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CASEServer.cpp
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/*
*
* Copyright (c) 2021 Project CHIP 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 <protocols/secure_channel/CASEServer.h>
#include <core/CHIPError.h>
#include <support/CodeUtils.h>
#include <support/SafeInt.h>
#include <transport/SecureSessionMgr.h>
using namespace ::chip::Inet;
using namespace ::chip::Transport;
namespace chip {
CHIP_ERROR CASEServer::WaitForSessionEstablishment(Messaging::ExchangeManager * exchangeManager, TransportMgrBase * transportMgr,
SecureSessionMgr * sessionMgr, Transport::AdminPairingTable * admins)
{
VerifyOrReturnError(transportMgr != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrReturnError(exchangeManager != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrReturnError(sessionMgr != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrReturnError(admins != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
mSessionMgr = sessionMgr;
mAdmins = admins;
mExchangeManager = exchangeManager;
ReturnErrorOnFailure(mPairingSession.MessageDispatch().Init(transportMgr));
ReturnErrorOnFailure(
mExchangeManager->RegisterUnsolicitedMessageHandlerForType(Protocols::SecureChannel::MsgType::CASE_SigmaR1, this));
return CHIP_NO_ERROR;
}
CHIP_ERROR CASEServer::InitCASEHandshake(Messaging::ExchangeContext * ec)
{
ReturnErrorCodeIf(ec == nullptr, CHIP_ERROR_INVALID_ARGUMENT);
// Lookup the admin that corresponds to the CASE session setup request.
// Each admin provisions their own credentials on the device. So it's essential to
// use the correct operational certificates for CASE session setup.
mAdminId = ec->GetSecureSession().GetAdminId();
ReturnErrorCodeIf(mAdminId == Transport::kUndefinedAdminId, CHIP_ERROR_INVALID_ARGUMENT);
Transport::AdminPairingInfo * admin = mAdmins->FindAdminWithId(mAdminId);
ReturnErrorCodeIf(admin == nullptr, CHIP_ERROR_INVALID_ARGUMENT);
ReturnErrorOnFailure(admin->GetOperationalCertificateSet(mCertificates));
mCredentials.Release();
ReturnErrorOnFailure(mCredentials.Init(&mCertificates, mCertificates.GetCertCount()));
// Setup CASE state machine using the credentials for the current admin.
ReturnErrorOnFailure(mPairingSession.WaitForSessionEstablishment(&mCredentials, mNextKeyId++, this));
// Hand over the exchange context to the CASE session.
ec->SetDelegate(&mPairingSession);
return CHIP_NO_ERROR;
}
void CASEServer::OnMessageReceived(Messaging::ExchangeContext * ec, const PacketHeader & packetHeader,
const PayloadHeader & payloadHeader, System::PacketBufferHandle payload)
{
ReturnOnFailure(InitCASEHandshake(ec));
mPairingSession.OnMessageReceived(ec, packetHeader, payloadHeader, std::move(payload));
// TODO - Enable multiple concurrent CASE session establishment
// This will prevent CASEServer to process another CASE session establishment request until the current
// one completes (successfully or failed)
mExchangeManager->UnregisterUnsolicitedMessageHandlerForType(Protocols::SecureChannel::MsgType::CASE_SigmaR1);
}
void CASEServer::Cleanup()
{
// Let's re-register for CASE SigmaR1 message, so that the next CASE session setup request can be processed.
mExchangeManager->RegisterUnsolicitedMessageHandlerForType(Protocols::SecureChannel::MsgType::CASE_SigmaR1, this);
mAdminId = Transport::kUndefinedAdminId;
mCredentials.Release();
}
void CASEServer::OnSessionEstablishmentError(CHIP_ERROR err)
{
ChipLogProgress(AppServer, "CASE Session establishment failed: %s", ErrorStr(err));
Cleanup();
}
void CASEServer::OnSessionEstablished()
{
ChipLogProgress(AppServer, "CASE Session established. Setting up the secure channel.");
CHIP_ERROR err =
mSessionMgr->NewPairing(Optional<Transport::PeerAddress>::Value(mPairingSession.PeerConnection().GetPeerAddress()),
mPairingSession.PeerConnection().GetPeerNodeId(), &mPairingSession,
SecureSession::SessionRole::kResponder, mAdminId, nullptr);
if (err != CHIP_NO_ERROR)
{
ChipLogError(Ble, "Failed in setting up secure channel: err %s", ErrorStr(err));
OnSessionEstablishmentError(err);
return;
}
ChipLogProgress(AppServer, "CASE secure channel is available now.");
Cleanup();
}
} // namespace chip