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Allow partial validation of DAC and CD (for external cloud or custom …
…app based validation) (project-chip#21725) * Draft: Allow partial validation of DAC and CD (when PAA list is not local) * Draft: Allow partial validation of DAC and CD (when PAA list is not local) * Move cloud attestation to a separate class, re-structure default attestation verification logic to allow cloud verifier to leverage it * straggler * address feedback * address feedback * straggler * fix builds, integration tests
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151 changes: 151 additions & 0 deletions
151
src/credentials/attestation_verifier/DacOnlyPartialAttestationVerifier.cpp
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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 "DacOnlyPartialAttestationVerifier.h" | ||
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| #include <controller/OperationalCredentialsDelegate.h> | ||
| #include <credentials/CHIPCert.h> | ||
| #include <credentials/CertificationDeclaration.h> | ||
| #include <credentials/DeviceAttestationConstructor.h> | ||
| #include <credentials/DeviceAttestationVendorReserved.h> | ||
| #include <crypto/CHIPCryptoPAL.h> | ||
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| #include <lib/core/CHIPError.h> | ||
| #include <lib/support/CodeUtils.h> | ||
| #include <lib/support/ScopedBuffer.h> | ||
| #include <lib/support/Span.h> | ||
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| using namespace chip::Crypto; | ||
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| namespace chip { | ||
| namespace Credentials { | ||
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| // As per specifications section 11.22.5.1. Constant RESP_MAX | ||
| constexpr size_t kMaxResponseLength = 900; | ||
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| void PartialDACVerifier::VerifyAttestationInformation(const DeviceAttestationVerifier::AttestationInfo & info, | ||
| Callback::Callback<OnAttestationInformationVerification> * onCompletion) | ||
| { | ||
| AttestationVerificationResult attestationError = AttestationVerificationResult::kSuccess; | ||
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| AttestationCertVidPid dacVidPid; | ||
| AttestationCertVidPid paiVidPid; | ||
| AttestationCertVidPid paaVidPid; | ||
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| DeviceInfoForAttestation deviceInfo{ | ||
| .vendorId = info.vendorId, | ||
| .productId = info.productId, | ||
| }; | ||
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| VerifyOrExit(!info.attestationElementsBuffer.empty() && !info.attestationChallengeBuffer.empty() && | ||
| !info.attestationSignatureBuffer.empty() && !info.paiDerBuffer.empty() && !info.dacDerBuffer.empty() && | ||
| !info.attestationNonceBuffer.empty() && onCompletion != nullptr, | ||
| attestationError = AttestationVerificationResult::kInvalidArgument); | ||
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| VerifyOrExit(info.attestationElementsBuffer.size() <= kMaxResponseLength, | ||
| attestationError = AttestationVerificationResult::kInvalidArgument); | ||
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| // match DAC and PAI VIDs | ||
| { | ||
| VerifyOrExit(ExtractVIDPIDFromX509Cert(info.dacDerBuffer, dacVidPid) == CHIP_NO_ERROR, | ||
| attestationError = AttestationVerificationResult::kDacFormatInvalid); | ||
| VerifyOrExit(ExtractVIDPIDFromX509Cert(info.paiDerBuffer, paiVidPid) == CHIP_NO_ERROR, | ||
| attestationError = AttestationVerificationResult::kPaiFormatInvalid); | ||
| VerifyOrExit(paiVidPid.mVendorId.HasValue() && paiVidPid.mVendorId == dacVidPid.mVendorId, | ||
| attestationError = AttestationVerificationResult::kDacVendorIdMismatch); | ||
| VerifyOrExit(dacVidPid.mProductId.HasValue(), attestationError = AttestationVerificationResult::kDacProductIdMismatch); | ||
| if (paiVidPid.mProductId.HasValue()) | ||
| { | ||
| VerifyOrExit(paiVidPid.mProductId == dacVidPid.mProductId, | ||
| attestationError = AttestationVerificationResult::kDacProductIdMismatch); | ||
| } | ||
| } | ||
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| { | ||
| P256PublicKey remoteManufacturerPubkey; | ||
| P256ECDSASignature deviceSignature; | ||
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| VerifyOrExit(ExtractPubkeyFromX509Cert(info.dacDerBuffer, remoteManufacturerPubkey) == CHIP_NO_ERROR, | ||
| attestationError = AttestationVerificationResult::kDacFormatInvalid); | ||
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| // Validate overall attestation signature on attestation information | ||
| // SetLength will fail if signature doesn't fit | ||
| VerifyOrExit(deviceSignature.SetLength(info.attestationSignatureBuffer.size()) == CHIP_NO_ERROR, | ||
| attestationError = AttestationVerificationResult::kAttestationSignatureInvalidFormat); | ||
| memcpy(deviceSignature.Bytes(), info.attestationSignatureBuffer.data(), info.attestationSignatureBuffer.size()); | ||
| VerifyOrExit(ValidateAttestationSignature(remoteManufacturerPubkey, info.attestationElementsBuffer, | ||
| info.attestationChallengeBuffer, deviceSignature) == CHIP_NO_ERROR, | ||
| attestationError = AttestationVerificationResult::kAttestationSignatureInvalid); | ||
| } | ||
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| { | ||
| MutableByteSpan akid(deviceInfo.paaSKID); | ||
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| VerifyOrExit(ExtractAKIDFromX509Cert(info.paiDerBuffer, akid) == CHIP_NO_ERROR, | ||
| attestationError = AttestationVerificationResult::kPaiFormatInvalid); | ||
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| ChipLogProgress(Support, "PartialDACVerifier::CheckPAA skipping vid-scoped PAA check - PAARootStore disabled"); | ||
| } | ||
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| #if !defined(CURRENT_TIME_NOT_IMPLEMENTED) | ||
| VerifyOrExit(IsCertificateValidAtCurrentTime(info.dacDerBuffer) == CHIP_NO_ERROR, | ||
| attestationError = AttestationVerificationResult::kDacExpired); | ||
| #endif | ||
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| ChipLogProgress(Support, "PartialDACVerifier::CheckCertChain skipping cert chain check - PAARootStore disabled"); | ||
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| { | ||
| ByteSpan certificationDeclarationSpan; | ||
| ByteSpan attestationNonceSpan; | ||
| uint32_t timestampDeconstructed; | ||
| ByteSpan firmwareInfoSpan; | ||
| DeviceAttestationVendorReservedDeconstructor vendorReserved; | ||
| ByteSpan certificationDeclarationPayload; | ||
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| deviceInfo.dacVendorId = dacVidPid.mVendorId.Value(); | ||
| deviceInfo.dacProductId = dacVidPid.mProductId.Value(); | ||
| deviceInfo.paiVendorId = paiVidPid.mVendorId.Value(); | ||
| deviceInfo.paiProductId = paiVidPid.mProductId.ValueOr(0); | ||
| deviceInfo.paaVendorId = paaVidPid.mVendorId.ValueOr(VendorId::NotSpecified); | ||
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| ChipLogProgress( | ||
| Support, | ||
| "PartialDACVerifier::VerifyAttestationInformation skipping PAA subject key id extraction - PAARootStore disabled"); | ||
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| VerifyOrExit(DeconstructAttestationElements(info.attestationElementsBuffer, certificationDeclarationSpan, | ||
| attestationNonceSpan, timestampDeconstructed, firmwareInfoSpan, | ||
| vendorReserved) == CHIP_NO_ERROR, | ||
| attestationError = AttestationVerificationResult::kAttestationElementsMalformed); | ||
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| // Verify that Nonce matches with what we sent | ||
| VerifyOrExit(attestationNonceSpan.data_equal(info.attestationNonceBuffer), | ||
| attestationError = AttestationVerificationResult::kAttestationNonceMismatch); | ||
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| ChipLogProgress(Support, | ||
| "PartialDACVerifier::VerifyAttestationInformation skipping CD signature check - LocalCSAStore disabled"); | ||
| VerifyOrExit(CMS_ExtractCDContent(certificationDeclarationSpan, certificationDeclarationPayload) == CHIP_NO_ERROR, | ||
| attestationError = AttestationVerificationResult::kPaaFormatInvalid); | ||
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| attestationError = ValidateCertificateDeclarationPayload(certificationDeclarationPayload, firmwareInfoSpan, deviceInfo); | ||
| VerifyOrExit(attestationError == AttestationVerificationResult::kSuccess, attestationError = attestationError); | ||
| } | ||
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| exit: | ||
| onCompletion->mCall(onCompletion->mContext, attestationError); // TODO: is this check getting done? | ||
| } | ||
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| } // namespace Credentials | ||
| } // namespace chip |
36 changes: 36 additions & 0 deletions
36
src/credentials/attestation_verifier/DacOnlyPartialAttestationVerifier.h
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| /* | ||
| * | ||
| * 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. | ||
| */ | ||
| #pragma once | ||
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| #include <credentials/attestation_verifier/DefaultDeviceAttestationVerifier.h> | ||
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| namespace chip { | ||
| namespace Credentials { | ||
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| class PartialDACVerifier : public DefaultDACVerifier | ||
| { | ||
| public: | ||
| PartialDACVerifier() {} | ||
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| void VerifyAttestationInformation(const DeviceAttestationVerifier::AttestationInfo & info, | ||
| Callback::Callback<OnAttestationInformationVerification> * onCompletion) override; | ||
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| protected: | ||
| }; | ||
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| } // namespace Credentials | ||
| } // namespace chip |