| /** |
| * Copyright (c) 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. |
| */ |
| |
| #import "MTRDeviceControllerStartupParams.h" |
| #import "MTRCertificates.h" |
| #import "MTRDeviceControllerStartupParams_Internal.h" |
| #import "MTRLogging.h" |
| #import "MTRP256KeypairBridge.h" |
| #import "NSDataSpanConversion.h" |
| |
| #include <controller/OperationalCredentialsDelegate.h> |
| #include <credentials/CHIPCert.h> |
| #include <credentials/FabricTable.h> |
| #include <lib/core/PeerId.h> |
| |
| using namespace chip; |
| |
| @implementation MTRDeviceControllerStartupParams |
| |
| - (instancetype)initWithIPK:(NSData *)ipk fabricID:(NSNumber *)fabricID nocSigner:(id<MTRKeypair>)nocSigner |
| { |
| if (!(self = [super init])) { |
| return nil; |
| } |
| |
| if (!IsValidFabricId(fabricID.unsignedLongLongValue)) { |
| MTR_LOG_ERROR("%llu is not a valid fabric id to initialize a device controller with", fabricID.unsignedLongLongValue); |
| return nil; |
| } |
| |
| _nocSigner = nocSigner; |
| _fabricID = [fabricID copy]; |
| _ipk = [ipk copy]; |
| |
| return self; |
| } |
| |
| - (instancetype)initWithIPK:(NSData *)ipk |
| operationalKeypair:(id<MTRKeypair>)operationalKeypair |
| operationalCertificate:(MTRCertificateDERBytes)operationalCertificate |
| intermediateCertificate:(MTRCertificateDERBytes _Nullable)intermediateCertificate |
| rootCertificate:(MTRCertificateDERBytes)rootCertificate |
| { |
| if (!(self = [super init])) { |
| return nil; |
| } |
| |
| { // Scope for temporaries |
| // ExtractNodeIdFabricIdFromOpCert needs a TLV-encoded opcert, not a DER-encoded one. |
| uint8_t tlvOpCertBuf[Credentials::kMaxCHIPCertLength]; |
| MutableByteSpan tlvOpCert(tlvOpCertBuf); |
| CHIP_ERROR err = Credentials::ConvertX509CertToChipCert(AsByteSpan(operationalCertificate), tlvOpCert); |
| if (err != CHIP_NO_ERROR) { |
| MTR_LOG_ERROR("Unable to convert operational certificate to TLV: %s", ErrorStr(err)); |
| return nil; |
| } |
| |
| FabricId fabricId = kUndefinedFabricId; |
| NodeId unused = kUndefinedNodeId; |
| err = Credentials::ExtractNodeIdFabricIdFromOpCert(tlvOpCert, &unused, &fabricId); |
| if (err != CHIP_NO_ERROR) { |
| MTR_LOG_ERROR("Unable to extract fabric id from operational certificate: %s", ErrorStr(err)); |
| return nil; |
| } |
| _fabricID = @(fabricId); |
| } |
| |
| _operationalKeypair = operationalKeypair; |
| _operationalCertificate = [operationalCertificate copy]; |
| _intermediateCertificate = [intermediateCertificate copy]; |
| _rootCertificate = [rootCertificate copy]; |
| _ipk = [ipk copy]; |
| |
| return self; |
| } |
| |
| - (instancetype)initWithParams:(MTRDeviceControllerStartupParams *)params |
| { |
| if (!(self = [super init])) { |
| return nil; |
| } |
| |
| _nocSigner = params.nocSigner; |
| _fabricID = params.fabricID; |
| _ipk = params.ipk; |
| _vendorID = params.vendorID; |
| _nodeID = params.nodeID; |
| _rootCertificate = params.rootCertificate; |
| _intermediateCertificate = params.intermediateCertificate; |
| _operationalCertificate = params.operationalCertificate; |
| _operationalKeypair = params.operationalKeypair; |
| |
| return self; |
| } |
| |
| @end |
| |
| // Convert a ByteSpan representing a Matter TLV certificate into NSData holding |
| // a DER X.509 certificate. Returns nil on failures. |
| static NSData * _Nullable MatterCertToX509Data(const ByteSpan & cert) |
| { |
| uint8_t buf[Controller::kMaxCHIPDERCertLength]; |
| MutableByteSpan derCert(buf); |
| CHIP_ERROR err = Credentials::ConvertChipCertToX509Cert(cert, derCert); |
| if (err != CHIP_NO_ERROR) { |
| MTR_LOG_ERROR("Failed do convert Matter certificate to X.509 DER: %s", ErrorStr(err)); |
| return nil; |
| } |
| |
| return AsData(derCert); |
| } |
| |
| @implementation MTRDeviceControllerStartupParams (Deprecated) |
| |
| - (uint64_t)fabricId |
| { |
| return self.fabricID.unsignedLongLongValue; |
| } |
| |
| - (nullable NSNumber *)vendorId |
| { |
| return self.vendorID; |
| } |
| |
| - (void)setVendorId:(nullable NSNumber *)vendorId |
| { |
| self.vendorID = vendorId; |
| } |
| |
| - (nullable NSNumber *)nodeId |
| { |
| return self.nodeID; |
| } |
| |
| - (void)setNodeId:(nullable NSNumber *)nodeId |
| { |
| self.nodeID = nodeId; |
| } |
| |
| - (instancetype)initWithSigningKeypair:(id<MTRKeypair>)nocSigner fabricId:(uint64_t)fabricId ipk:(NSData *)ipk |
| { |
| return [self initWithIPK:ipk fabricID:@(fabricId) nocSigner:nocSigner]; |
| } |
| |
| - (instancetype)initWithOperationalKeypair:(id<MTRKeypair>)operationalKeypair |
| operationalCertificate:(MTRCertificateDERBytes)operationalCertificate |
| intermediateCertificate:(MTRCertificateDERBytes _Nullable)intermediateCertificate |
| rootCertificate:(MTRCertificateDERBytes)rootCertificate |
| ipk:(NSData *)ipk |
| { |
| return [self initWithIPK:ipk |
| operationalKeypair:operationalKeypair |
| operationalCertificate:operationalCertificate |
| intermediateCertificate:intermediateCertificate |
| rootCertificate:rootCertificate]; |
| } |
| |
| @end |
| |
| @implementation MTRDeviceControllerStartupParamsInternal |
| |
| - (instancetype)initWithParams:(MTRDeviceControllerStartupParams *)params |
| { |
| if (!(self = [super initWithParams:params])) { |
| return nil; |
| } |
| |
| if (self.nocSigner == nil && self.rootCertificate == nil) { |
| MTR_LOG_ERROR("nocSigner and rootCertificate are both nil; no public key available to identify the fabric"); |
| return nil; |
| } |
| |
| if (self.operationalCertificate != nil && self.nodeID != nil) { |
| MTR_LOG_ERROR("nodeID must be nil if operationalCertificate is not nil"); |
| return nil; |
| } |
| |
| if (self.operationalCertificate != nil) { |
| if (self.operationalKeypair == nil) { |
| MTR_LOG_ERROR("Must have an operational keypair if an operational certificate is provided"); |
| return nil; |
| } |
| |
| if (![MTRCertificates keypair:self.operationalKeypair matchesCertificate:self.operationalCertificate]) { |
| MTR_LOG_ERROR("operationalKeypair public key does not match operationalCertificate"); |
| return nil; |
| } |
| } |
| |
| return self; |
| } |
| |
| - (instancetype)initForNewFabric:(chip::FabricTable *)fabricTable |
| keystore:(chip::Crypto::OperationalKeystore *)keystore |
| params:(MTRDeviceControllerStartupParams *)params |
| { |
| if (!(self = [self initWithParams:params])) { |
| return nil; |
| } |
| |
| if (self.nocSigner == nil && self.operationalCertificate == nil) { |
| MTR_LOG_ERROR("No way to get an operational certificate: nocSigner and operationalCertificate are both nil"); |
| return nil; |
| } |
| |
| if (self.operationalCertificate == nil && self.nodeID == nil) { |
| // Just avoid setting the top bit, to avoid issues with node |
| // ids outside the operational range. |
| uint64_t nodeId = arc4random(); |
| nodeId = (nodeId << 31) | (arc4random() >> 1); |
| self.nodeID = @(nodeId); |
| } |
| |
| if (self.rootCertificate == nil) { |
| NSError * error; |
| self.rootCertificate = [MTRCertificates createRootCertificate:self.nocSigner |
| issuerID:nil |
| fabricID:self.fabricID |
| error:&error]; |
| if (error != nil || self.rootCertificate == nil) { |
| MTR_LOG_ERROR("Failed to generate root certificate: %@", error); |
| return nil; |
| } |
| } |
| |
| _fabricTable = fabricTable; |
| _keystore = keystore; |
| |
| return self; |
| } |
| |
| - (instancetype)initForExistingFabric:(FabricTable *)fabricTable |
| fabricIndex:(FabricIndex)fabricIndex |
| keystore:(chip::Crypto::OperationalKeystore *)keystore |
| params:(MTRDeviceControllerStartupParams *)params |
| { |
| if (!(self = [self initWithParams:params])) { |
| return nil; |
| } |
| |
| const FabricInfo * fabric = fabricTable->FindFabricWithIndex(fabricIndex); |
| |
| if (self.vendorID == nil) { |
| self.vendorID = @(fabric->GetVendorId()); |
| } |
| |
| BOOL usingExistingNOC = NO; |
| if (self.operationalCertificate == nil && self.nodeID == nil) { |
| self.nodeID = @(fabric->GetNodeId()); |
| |
| if (self.operationalKeypair == nil) { |
| uint8_t nocBuf[Credentials::kMaxCHIPCertLength]; |
| MutableByteSpan noc(nocBuf); |
| CHIP_ERROR err = fabricTable->FetchNOCCert(fabric->GetFabricIndex(), noc); |
| if (err != CHIP_NO_ERROR) { |
| MTR_LOG_ERROR("Failed to get existing NOC: %s", ErrorStr(err)); |
| return nil; |
| } |
| self.operationalCertificate = MatterCertToX509Data(noc); |
| if (self.operationalCertificate == nil) { |
| MTR_LOG_ERROR("Failed to convert TLV NOC to DER X.509: %s", ErrorStr(err)); |
| return nil; |
| } |
| if (!keystore->HasOpKeypairForFabric(fabric->GetFabricIndex())) { |
| MTR_LOG_ERROR("No existing operational key for fabric"); |
| return nil; |
| } |
| } |
| |
| usingExistingNOC = YES; |
| } |
| |
| NSData * oldIntermediateCert = nil; |
| { |
| uint8_t icaBuf[Credentials::kMaxCHIPCertLength]; |
| MutableByteSpan icaCert(icaBuf); |
| CHIP_ERROR err = fabricTable->FetchICACert(fabric->GetFabricIndex(), icaCert); |
| if (err != CHIP_NO_ERROR) { |
| MTR_LOG_ERROR("Failed to get existing intermediate certificate: %s", ErrorStr(err)); |
| return nil; |
| } |
| // There might not be an ICA cert for this fabric. |
| if (!icaCert.empty()) { |
| oldIntermediateCert = MatterCertToX509Data(icaCert); |
| if (oldIntermediateCert == nil) { |
| return nil; |
| } |
| } |
| } |
| |
| if (self.nocSigner != nil && self.intermediateCertificate == nil && oldIntermediateCert != nil) { |
| // It's possible that we are switching from using an ICA cert to not using |
| // one. We can detect this case by checking whether the provided nocSigner |
| // matches the ICA cert. |
| if ([MTRCertificates keypair:self.nocSigner matchesCertificate:oldIntermediateCert] == YES) { |
| // Keep using the existing intermediate certificate. |
| self.intermediateCertificate = oldIntermediateCert; |
| } |
| // else presumably the nocSigner matches the root (will be verified later) |
| // and we are no longer using an intermediate. |
| } |
| |
| // If we were planning to use our existing NOC from the fabric info but we are |
| // changing from having an ICA to not having one, or changing from having one |
| // to not having one, or changing the identity of our ICA, we need to generate |
| // a new NOC. But we can keep our existing operational keypair and node id; |
| // nothing is forcing us to rotate those. |
| if (usingExistingNOC == YES |
| && ((oldIntermediateCert == nil) != (self.intermediateCertificate == nil) |
| || ((oldIntermediateCert != nil) && |
| [MTRCertificates isCertificate:oldIntermediateCert equalTo:self.intermediateCertificate] == NO))) { |
| self.operationalCertificate = nil; |
| } |
| |
| NSData * oldRootCert; |
| { |
| uint8_t rootBuf[Credentials::kMaxCHIPCertLength]; |
| MutableByteSpan rootCert(rootBuf); |
| CHIP_ERROR err = fabricTable->FetchRootCert(fabric->GetFabricIndex(), rootCert); |
| if (err != CHIP_NO_ERROR) { |
| MTR_LOG_ERROR("Failed to get existing root certificate: %s", ErrorStr(err)); |
| return nil; |
| } |
| oldRootCert = MatterCertToX509Data(rootCert); |
| if (oldRootCert == nil) { |
| return nil; |
| } |
| } |
| |
| if (self.rootCertificate == nil) { |
| self.rootCertificate = oldRootCert; |
| } else if ([MTRCertificates isCertificate:oldRootCert equalTo:self.rootCertificate] == NO) { |
| MTR_LOG_ERROR("Root certificate identity does not match existing root certificate"); |
| return nil; |
| } |
| |
| _fabricTable = fabricTable; |
| _fabricIndex.Emplace(fabricIndex); |
| _keystore = keystore; |
| |
| return self; |
| } |
| |
| - (BOOL)keypairsMatchCertificates |
| { |
| if (self.nocSigner != nil) { |
| NSData * signingCert = self.intermediateCertificate; |
| if (signingCert == nil) { |
| signingCert = self.rootCertificate; |
| if (signingCert == nil) { |
| MTR_LOG_ERROR("No certificate to match nocSigner"); |
| return NO; |
| } |
| } |
| |
| if ([MTRCertificates keypair:self.nocSigner matchesCertificate:signingCert] == NO) { |
| MTR_LOG_ERROR("Provided nocSigner does not match certificates"); |
| return NO; |
| } |
| } |
| |
| if (self.operationalCertificate != nil && self.operationalKeypair != nil) { |
| if ([MTRCertificates keypair:self.operationalKeypair matchesCertificate:self.operationalCertificate] == NO) { |
| MTR_LOG_ERROR("Provided operationalKeypair does not match operationalCertificate"); |
| return NO; |
| } |
| } |
| |
| return YES; |
| } |
| |
| @end |
