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/*
*
* Copyright (c) 2021-2022 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 <app/server/CommissioningWindowManager.h>
#include <app/server/Dnssd.h>
#include <app/server/Server.h>
#include <lib/dnssd/Advertiser.h>
#include <lib/support/CodeUtils.h>
#include <platform/CHIPDeviceLayer.h>
#include <platform/CommissionableDataProvider.h>
#include <platform/DeviceControlServer.h>
using namespace chip::app::Clusters;
using namespace chip::System::Clock;
using AdministratorCommissioning::CommissioningWindowStatus;
namespace {
// As per specifications (Section 13.3), Nodes SHALL exit commissioning mode after 20 failed commission attempts.
constexpr uint8_t kMaxFailedCommissioningAttempts = 20;
void HandleSessionEstablishmentTimeout(chip::System::Layer * aSystemLayer, void * aAppState)
{
chip::CommissioningWindowManager * commissionMgr = static_cast<chip::CommissioningWindowManager *>(aAppState);
commissionMgr->OnSessionEstablishmentError(CHIP_ERROR_TIMEOUT);
}
void OnPlatformEventWrapper(const chip::DeviceLayer::ChipDeviceEvent * event, intptr_t arg)
{
chip::CommissioningWindowManager * commissionMgr = reinterpret_cast<chip::CommissioningWindowManager *>(arg);
commissionMgr->OnPlatformEvent(event);
}
} // namespace
namespace chip {
void CommissioningWindowManager::OnPlatformEvent(const DeviceLayer::ChipDeviceEvent * event)
{
if (event->Type == DeviceLayer::DeviceEventType::kCommissioningComplete)
{
ChipLogProgress(AppServer, "Commissioning completed successfully");
DeviceLayer::SystemLayer().CancelTimer(HandleCommissioningWindowTimeout, this);
mCommissioningTimeoutTimerArmed = false;
Cleanup();
mServer->GetSecureSessionManager().ExpireAllPASESessions();
// That should have cleared out mPASESession.
#if CONFIG_NETWORK_LAYER_BLE
mServer->GetBleLayerObject()->CloseAllBleConnections();
#endif
}
else if (event->Type == DeviceLayer::DeviceEventType::kFailSafeTimerExpired)
{
ChipLogError(AppServer, "Failsafe timer expired");
if (mPASESession)
{
mPASESession->AsSecureSession()->MarkForEviction();
}
HandleFailedAttempt(CHIP_ERROR_TIMEOUT);
}
else if (event->Type == DeviceLayer::DeviceEventType::kOperationalNetworkEnabled)
{
app::DnssdServer::Instance().AdvertiseOperational();
ChipLogProgress(AppServer, "Operational advertising enabled");
}
}
void CommissioningWindowManager::Shutdown()
{
StopAdvertisement(/* aShuttingDown = */ true);
ResetState();
}
void CommissioningWindowManager::ResetState()
{
mUseECM = false;
mECMDiscriminator = 0;
mECMIterations = 0;
mECMSaltLength = 0;
mWindowStatus = CommissioningWindowStatus::kWindowNotOpen;
mOpenerFabricIndex.SetNull();
mOpenerVendorId.SetNull();
memset(&mECMPASEVerifier, 0, sizeof(mECMPASEVerifier));
memset(mECMSalt, 0, sizeof(mECMSalt));
DeviceLayer::SystemLayer().CancelTimer(HandleCommissioningWindowTimeout, this);
mCommissioningTimeoutTimerArmed = false;
}
void CommissioningWindowManager::Cleanup()
{
StopAdvertisement(/* aShuttingDown = */ false);
ResetState();
}
void CommissioningWindowManager::OnSessionEstablishmentError(CHIP_ERROR err)
{
DeviceLayer::SystemLayer().CancelTimer(HandleSessionEstablishmentTimeout, this);
HandleFailedAttempt(err);
}
void CommissioningWindowManager::HandleFailedAttempt(CHIP_ERROR err)
{
mFailedCommissioningAttempts++;
ChipLogError(AppServer, "Commissioning failed (attempt %d): %" CHIP_ERROR_FORMAT, mFailedCommissioningAttempts, err.Format());
#if CONFIG_NETWORK_LAYER_BLE
mServer->GetBleLayerObject()->CloseAllBleConnections();
#endif
if (mFailedCommissioningAttempts < kMaxFailedCommissioningAttempts)
{
// If the number of commissioning attempts has not exceeded maximum
// retries, let's start listening for commissioning connections again.
err = AdvertiseAndListenForPASE();
}
if (err != CHIP_NO_ERROR)
{
// The commissioning attempts limit was exceeded, or listening for
// commmissioning connections failed.
Cleanup();
if (mAppDelegate != nullptr)
{
mAppDelegate->OnCommissioningSessionStopped();
}
}
}
void CommissioningWindowManager::OnSessionEstablishmentStarted()
{
// As per specifications, section 5.5: Commissioning Flows
constexpr System::Clock::Timeout kPASESessionEstablishmentTimeout = System::Clock::Seconds16(60);
DeviceLayer::SystemLayer().StartTimer(kPASESessionEstablishmentTimeout, HandleSessionEstablishmentTimeout, this);
}
void CommissioningWindowManager::OnSessionEstablished(const SessionHandle & session)
{
DeviceLayer::SystemLayer().CancelTimer(HandleSessionEstablishmentTimeout, this);
ChipLogProgress(AppServer, "Commissioning completed session establishment step");
if (mAppDelegate != nullptr)
{
mAppDelegate->OnCommissioningSessionStarted();
}
DeviceLayer::PlatformMgr().AddEventHandler(OnPlatformEventWrapper, reinterpret_cast<intptr_t>(this));
StopAdvertisement(/* aShuttingDown = */ false);
auto & failSafeContext = Server::GetInstance().GetFailSafeContext();
// This should never be armed because we don't allow CASE sessions to arm the failsafe when the commissioning window is open and
// we check that the failsafe is not armed before opening the commissioning window. None the less, it is good to double-check.
CHIP_ERROR err = CHIP_NO_ERROR;
if (failSafeContext.IsFailSafeArmed())
{
ChipLogError(AppServer, "Error - arm failsafe is already armed on PASE session establishment completion");
}
else
{
err = failSafeContext.ArmFailSafe(kUndefinedFabricIndex, System::Clock::Seconds16(60));
if (err != CHIP_NO_ERROR)
{
ChipLogError(AppServer, "Error arming failsafe on PASE session establishment completion");
// Don't allow a PASE session to hang around without a fail-safe.
session->AsSecureSession()->MarkForEviction();
HandleFailedAttempt(err);
}
}
ChipLogProgress(AppServer, "Device completed Rendezvous process");
if (err == CHIP_NO_ERROR)
{
// When the now-armed fail-safe is disarmed or expires it will handle
// clearing out mPASESession.
mPASESession.Grab(session);
}
}
CHIP_ERROR CommissioningWindowManager::OpenCommissioningWindow(Seconds16 commissioningTimeout)
{
VerifyOrReturnError(commissioningTimeout <= MaxCommissioningTimeout() && commissioningTimeout >= MinCommissioningTimeout(),
CHIP_ERROR_INVALID_ARGUMENT);
auto & failSafeContext = Server::GetInstance().GetFailSafeContext();
VerifyOrReturnError(failSafeContext.IsFailSafeFullyDisarmed(), CHIP_ERROR_INCORRECT_STATE);
ReturnErrorOnFailure(Dnssd::ServiceAdvertiser::Instance().UpdateCommissionableInstanceName());
ReturnErrorOnFailure(DeviceLayer::SystemLayer().StartTimer(commissioningTimeout, HandleCommissioningWindowTimeout, this));
mCommissioningTimeoutTimerArmed = true;
return AdvertiseAndListenForPASE();
}
CHIP_ERROR CommissioningWindowManager::AdvertiseAndListenForPASE()
{
VerifyOrReturnError(mCommissioningTimeoutTimerArmed, CHIP_ERROR_INCORRECT_STATE);
mPairingSession.Clear();
#if CHIP_DEVICE_CONFIG_ENABLE_SED
if (!mIsBLE && !mListeningForPASE)
{
DeviceLayer::ConnectivityMgr().RequestSEDActiveMode(true);
}
#endif
ReturnErrorOnFailure(mServer->GetExchangeManager().RegisterUnsolicitedMessageHandlerForType(
Protocols::SecureChannel::MsgType::PBKDFParamRequest, &mPairingSession));
mListeningForPASE = true;
if (mUseECM)
{
ReturnErrorOnFailure(SetTemporaryDiscriminator(mECMDiscriminator));
ReturnErrorOnFailure(mPairingSession.WaitForPairing(mServer->GetSecureSessionManager(), mECMPASEVerifier, mECMIterations,
ByteSpan(mECMSalt, mECMSaltLength), GetLocalMRPConfig(), this));
}
else
{
uint32_t iterationCount = 0;
uint8_t salt[kSpake2p_Max_PBKDF_Salt_Length] = { 0 };
Spake2pVerifierSerialized serializedVerifier = { 0 };
size_t serializedVerifierLen = 0;
Spake2pVerifier verifier;
MutableByteSpan saltSpan{ salt };
MutableByteSpan verifierSpan{ serializedVerifier };
auto * commissionableDataProvider = DeviceLayer::GetCommissionableDataProvider();
ReturnErrorOnFailure(commissionableDataProvider->GetSpake2pIterationCount(iterationCount));
ReturnErrorOnFailure(commissionableDataProvider->GetSpake2pSalt(saltSpan));
ReturnErrorOnFailure(commissionableDataProvider->GetSpake2pVerifier(verifierSpan, serializedVerifierLen));
VerifyOrReturnError(Crypto::kSpake2p_VerifierSerialized_Length == serializedVerifierLen, CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrReturnError(verifierSpan.size() == serializedVerifierLen, CHIP_ERROR_INTERNAL);
ReturnErrorOnFailure(verifier.Deserialize(ByteSpan(serializedVerifier)));
ReturnErrorOnFailure(mPairingSession.WaitForPairing(mServer->GetSecureSessionManager(), verifier, iterationCount, saltSpan,
GetLocalMRPConfig(), this));
}
ReturnErrorOnFailure(StartAdvertisement());
return CHIP_NO_ERROR;
}
CHIP_ERROR CommissioningWindowManager::OpenBasicCommissioningWindow(Seconds16 commissioningTimeout,
CommissioningWindowAdvertisement advertisementMode)
{
RestoreDiscriminator();
#if CONFIG_NETWORK_LAYER_BLE
// Enable BLE advertisements if commissioning window is to be opened on all supported
// transports, and BLE is supported on the current device.
SetBLE(advertisementMode == chip::CommissioningWindowAdvertisement::kAllSupported);
#else
SetBLE(false);
#endif // CONFIG_NETWORK_LAYER_BLE
mFailedCommissioningAttempts = 0;
mUseECM = false;
CHIP_ERROR err = OpenCommissioningWindow(commissioningTimeout);
if (err != CHIP_NO_ERROR)
{
Cleanup();
}
return err;
}
CHIP_ERROR
CommissioningWindowManager::OpenBasicCommissioningWindowForAdministratorCommissioningCluster(
System::Clock::Seconds16 commissioningTimeout, FabricIndex fabricIndex, VendorId vendorId)
{
ReturnErrorOnFailure(OpenBasicCommissioningWindow(commissioningTimeout, CommissioningWindowAdvertisement::kDnssdOnly));
mOpenerFabricIndex.SetNonNull(fabricIndex);
mOpenerVendorId.SetNonNull(vendorId);
return CHIP_NO_ERROR;
}
CHIP_ERROR CommissioningWindowManager::OpenEnhancedCommissioningWindow(Seconds16 commissioningTimeout, uint16_t discriminator,
Spake2pVerifier & verifier, uint32_t iterations,
ByteSpan salt, FabricIndex fabricIndex, VendorId vendorId)
{
// Once a device is operational, it shall be commissioned into subsequent fabrics using
// the operational network only.
SetBLE(false);
VerifyOrReturnError(salt.size() <= sizeof(mECMSalt), CHIP_ERROR_INVALID_ARGUMENT);
memcpy(mECMSalt, salt.data(), salt.size());
mECMSaltLength = static_cast<uint32_t>(salt.size());
mFailedCommissioningAttempts = 0;
mECMDiscriminator = discriminator;
mECMIterations = iterations;
memcpy(&mECMPASEVerifier, &verifier, sizeof(Spake2pVerifier));
mUseECM = true;
CHIP_ERROR err = OpenCommissioningWindow(commissioningTimeout);
if (err != CHIP_NO_ERROR)
{
Cleanup();
}
else
{
mOpenerFabricIndex.SetNonNull(fabricIndex);
mOpenerVendorId.SetNonNull(vendorId);
}
return err;
}
void CommissioningWindowManager::CloseCommissioningWindow()
{
if (IsCommissioningWindowOpen())
{
#if CONFIG_NETWORK_LAYER_BLE
if (mListeningForPASE)
{
// We never established PASE, so never armed a fail-safe and hence
// can't rely on it expiring to close our BLE connection. Do that
// manually here.
mServer->GetBleLayerObject()->CloseAllBleConnections();
}
#endif
ChipLogProgress(AppServer, "Closing pairing window");
Cleanup();
}
}
CommissioningWindowStatus CommissioningWindowManager::CommissioningWindowStatusForCluster() const
{
if (mOpenerVendorId.IsNull())
{
// Not opened via the cluster.
return CommissioningWindowStatus::kWindowNotOpen;
}
return mWindowStatus;
}
bool CommissioningWindowManager::IsCommissioningWindowOpen() const
{
return mWindowStatus != CommissioningWindowStatus::kWindowNotOpen;
}
void CommissioningWindowManager::OnFabricRemoved(FabricIndex removedIndex)
{
if (!mOpenerFabricIndex.IsNull() && mOpenerFabricIndex.Value() == removedIndex)
{
// Per spec, we should clear out the stale fabric index.
mOpenerFabricIndex.SetNull();
}
}
Dnssd::CommissioningMode CommissioningWindowManager::GetCommissioningMode() const
{
if (!mListeningForPASE)
{
// We should not be advertising ourselves as in commissioning mode.
// We need to check this before mWindowStatus, because we might have an
// open window even while we are not listening for PASE.
return Dnssd::CommissioningMode::kDisabled;
}
switch (mWindowStatus)
{
case CommissioningWindowStatus::kEnhancedWindowOpen:
return Dnssd::CommissioningMode::kEnabledEnhanced;
case CommissioningWindowStatus::kBasicWindowOpen:
return Dnssd::CommissioningMode::kEnabledBasic;
default:
return Dnssd::CommissioningMode::kDisabled;
}
}
CHIP_ERROR CommissioningWindowManager::StartAdvertisement()
{
#if CHIP_ENABLE_ADDITIONAL_DATA_ADVERTISING
// notify device layer that advertisement is beginning (to do work such as increment rotating id)
DeviceLayer::ConfigurationMgr().NotifyOfAdvertisementStart();
#endif
#if CONFIG_NETWORK_LAYER_BLE
if (mIsBLE)
{
CHIP_ERROR err = chip::DeviceLayer::ConnectivityMgr().SetBLEAdvertisingEnabled(true);
// BLE advertising may just not be supported. That should not prevent
// us from opening a commissioning window and advertising over IP.
if (err == CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE)
{
ChipLogProgress(AppServer, "BLE networking available but BLE advertising is not supported");
err = CHIP_NO_ERROR;
}
ReturnErrorOnFailure(err);
}
#endif // CONFIG_NETWORK_LAYER_BLE
if (mUseECM)
{
mWindowStatus = CommissioningWindowStatus::kEnhancedWindowOpen;
}
else
{
mWindowStatus = CommissioningWindowStatus::kBasicWindowOpen;
}
if (mAppDelegate != nullptr)
{
mAppDelegate->OnCommissioningWindowOpened();
}
// reset all advertising, switching to our new commissioning mode.
app::DnssdServer::Instance().StartServer();
return CHIP_NO_ERROR;
}
CHIP_ERROR CommissioningWindowManager::StopAdvertisement(bool aShuttingDown)
{
RestoreDiscriminator();
#if CHIP_DEVICE_CONFIG_ENABLE_SED
if (!mIsBLE && mListeningForPASE)
{
DeviceLayer::ConnectivityMgr().RequestSEDActiveMode(false);
}
#endif
mServer->GetExchangeManager().UnregisterUnsolicitedMessageHandlerForType(Protocols::SecureChannel::MsgType::PBKDFParamRequest);
mListeningForPASE = false;
mPairingSession.Clear();
// If aShuttingDown, don't try to change our DNS-SD advertisements.
if (!aShuttingDown)
{
// Stop advertising commissioning mode, since we're not accepting PASE
// connections right now. If we start accepting them again (via
// AdvertiseAndListenForPASE) that will call StartAdvertisement as needed.
app::DnssdServer::Instance().StartServer();
}
#if CONFIG_NETWORK_LAYER_BLE
if (mIsBLE)
{
// Ignore errors from SetBLEAdvertisingEnabled (which could be due to
// BLE advertising not being supported at all). Our commissioning
// window is now closed and we need to notify our delegate of that.
(void) chip::DeviceLayer::ConnectivityMgr().SetBLEAdvertisingEnabled(false);
}
#endif // CONFIG_NETWORK_LAYER_BLE
if (mAppDelegate != nullptr)
{
mAppDelegate->OnCommissioningWindowClosed();
}
return CHIP_NO_ERROR;
}
CHIP_ERROR CommissioningWindowManager::SetTemporaryDiscriminator(uint16_t discriminator)
{
return app::DnssdServer::Instance().SetEphemeralDiscriminator(MakeOptional(discriminator));
}
CHIP_ERROR CommissioningWindowManager::RestoreDiscriminator()
{
return app::DnssdServer::Instance().SetEphemeralDiscriminator(NullOptional);
}
void CommissioningWindowManager::HandleCommissioningWindowTimeout(chip::System::Layer * aSystemLayer, void * aAppState)
{
auto * commissionMgr = static_cast<CommissioningWindowManager *>(aAppState);
commissionMgr->mCommissioningTimeoutTimerArmed = false;
commissionMgr->CloseCommissioningWindow();
}
void CommissioningWindowManager::OnSessionReleased()
{
// The PASE session has died, probably due to CloseSession. Immediately
// expire the fail-safe, if it's still armed (which it might not be if the
// PASE session is being released due to the fail-safe expiring or being
// disarmed).
//
// Expiring the fail-safe will make us start listening for new PASE sessions
// as needed.
//
// Note that at this point the fail-safe _must_ be associated with our PASE
// session, since we arm it when the PASE session is set up, and anything
// that disarms the fail-safe would also tear down the PASE session.
ExpireFailSafeIfArmed();
}
void CommissioningWindowManager::ExpireFailSafeIfArmed()
{
auto & failSafeContext = Server::GetInstance().GetFailSafeContext();
if (failSafeContext.IsFailSafeArmed())
{
failSafeContext.ForceFailSafeTimerExpiry();
}
}
} // namespace chip