| /* |
| * Copyright (c) 2023 Project CHIP Authors |
| * All rights reserved. |
| * |
| * 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. |
| */ |
| |
| /** |
| * @file |
| * mbedTLS based implementation of CHIP crypto primitives related to certificate |
| * generation and validation. |
| */ |
| |
| #include "CHIPCryptoPAL.h" |
| #include "CHIPCryptoPALmbedTLS.h" |
| |
| #include <lib/core/CHIPSafeCasts.h> |
| #include <lib/support/CodeUtils.h> |
| #include <lib/support/SafeInt.h> |
| |
| #include <mbedtls/ecp.h> |
| #include <mbedtls/oid.h> |
| #include <mbedtls/x509.h> |
| #include <mbedtls/x509_csr.h> |
| |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| #include <mbedtls/x509_crt.h> |
| #endif // defined(MBEDTLS_X509_CRT_PARSE_C) |
| |
| namespace chip { |
| namespace Crypto { |
| |
| CHIP_ERROR VerifyCertificateSigningRequest(const uint8_t * csr_buf, size_t csr_length, P256PublicKey & pubkey) |
| { |
| #if defined(MBEDTLS_X509_CSR_PARSE_C) |
| ReturnErrorOnFailure(VerifyCertificateSigningRequestFormat(csr_buf, csr_length)); |
| |
| // TODO: For some embedded targets, mbedTLS library doesn't have mbedtls_x509_csr_parse_der, and mbedtls_x509_csr_parse_free. |
| // Taking a step back, embedded targets likely will not process CSR requests. Adding this action item to reevaluate |
| // this if there's a need for this processing for embedded targets. |
| CHIP_ERROR error = CHIP_NO_ERROR; |
| size_t pubkey_size = 0; |
| |
| mbedtls_ecp_keypair * keypair = nullptr; |
| |
| P256ECDSASignature signature; |
| MutableByteSpan out_raw_sig_span(signature.Bytes(), signature.Capacity()); |
| |
| mbedtls_x509_csr csr; |
| mbedtls_x509_csr_init(&csr); |
| |
| int result = mbedtls_x509_csr_parse_der(&csr, csr_buf, csr_length); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); |
| |
| // Verify the signature algorithm and public key type |
| VerifyOrExit(csr.CHIP_CRYPTO_PAL_PRIVATE(sig_md) == MBEDTLS_MD_SHA256, error = CHIP_ERROR_UNSUPPORTED_SIGNATURE_TYPE); |
| VerifyOrExit(csr.CHIP_CRYPTO_PAL_PRIVATE(sig_pk) == MBEDTLS_PK_ECDSA, error = CHIP_ERROR_WRONG_KEY_TYPE); |
| |
| keypair = mbedtls_pk_ec(csr.CHIP_CRYPTO_PAL_PRIVATE_X509(pk)); |
| |
| // Copy the public key from the CSR |
| result = mbedtls_ecp_point_write_binary(&keypair->CHIP_CRYPTO_PAL_PRIVATE(grp), &keypair->CHIP_CRYPTO_PAL_PRIVATE(Q), |
| MBEDTLS_ECP_PF_UNCOMPRESSED, &pubkey_size, Uint8::to_uchar(pubkey), pubkey.Length()); |
| |
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); |
| VerifyOrExit(pubkey_size == pubkey.Length(), error = CHIP_ERROR_INTERNAL); |
| |
| // Convert DER signature to raw signature |
| error = EcdsaAsn1SignatureToRaw(kP256_FE_Length, |
| ByteSpan{ csr.CHIP_CRYPTO_PAL_PRIVATE(sig).CHIP_CRYPTO_PAL_PRIVATE_X509(p), |
| csr.CHIP_CRYPTO_PAL_PRIVATE(sig).CHIP_CRYPTO_PAL_PRIVATE_X509(len) }, |
| out_raw_sig_span); |
| |
| VerifyOrExit(error == CHIP_NO_ERROR, error = CHIP_ERROR_INVALID_ARGUMENT); |
| VerifyOrExit(out_raw_sig_span.size() == (kP256_FE_Length * 2), error = CHIP_ERROR_INTERNAL); |
| signature.SetLength(out_raw_sig_span.size()); |
| |
| // Verify the signature using the public key |
| error = pubkey.ECDSA_validate_msg_signature(csr.CHIP_CRYPTO_PAL_PRIVATE_X509(cri).CHIP_CRYPTO_PAL_PRIVATE_X509(p), |
| csr.CHIP_CRYPTO_PAL_PRIVATE_X509(cri).CHIP_CRYPTO_PAL_PRIVATE_X509(len), signature); |
| |
| SuccessOrExit(error); |
| |
| exit: |
| mbedtls_x509_csr_free(&csr); |
| _log_mbedTLS_error(result); |
| return error; |
| #else |
| ChipLogError(Crypto, "MBEDTLS_X509_CSR_PARSE_C is not enabled. CSR cannot be parsed"); |
| return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE; |
| #endif |
| } |
| |
| namespace { |
| |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| bool IsTimeGreaterThanEqual(const mbedtls_x509_time * const timeA, const mbedtls_x509_time * const timeB) |
| { |
| |
| // checks if two values are different and if yes, then returns first > second. |
| #define RETURN_STRICTLY_GREATER_IF_DIFFERENT(component) \ |
| { \ |
| auto valueA = timeA->CHIP_CRYPTO_PAL_PRIVATE_X509(component); \ |
| auto valueB = timeB->CHIP_CRYPTO_PAL_PRIVATE_X509(component); \ |
| \ |
| if (valueA != valueB) \ |
| { \ |
| return valueA > valueB; \ |
| } \ |
| } |
| |
| RETURN_STRICTLY_GREATER_IF_DIFFERENT(year); |
| RETURN_STRICTLY_GREATER_IF_DIFFERENT(mon); |
| RETURN_STRICTLY_GREATER_IF_DIFFERENT(day); |
| RETURN_STRICTLY_GREATER_IF_DIFFERENT(hour); |
| RETURN_STRICTLY_GREATER_IF_DIFFERENT(min); |
| RETURN_STRICTLY_GREATER_IF_DIFFERENT(sec); |
| |
| // all above are equal |
| return true; |
| } |
| |
| CHIP_ERROR IsCertificateValidAtIssuance(const mbedtls_x509_crt * candidateCertificate, const mbedtls_x509_crt * issuerCertificate) |
| { |
| mbedtls_x509_time candidateNotBeforeTime = candidateCertificate->CHIP_CRYPTO_PAL_PRIVATE_X509(valid_from); |
| mbedtls_x509_time issuerNotBeforeTime = issuerCertificate->CHIP_CRYPTO_PAL_PRIVATE_X509(valid_from); |
| mbedtls_x509_time issuerNotAfterTime = issuerCertificate->CHIP_CRYPTO_PAL_PRIVATE_X509(valid_to); |
| |
| // check if candidateCertificate is issued at or after issuerCertificate's notBefore timestamp |
| VerifyOrReturnError(IsTimeGreaterThanEqual(&candidateNotBeforeTime, &issuerNotBeforeTime), CHIP_ERROR_CERT_EXPIRED); |
| |
| // check if candidateCertificate is issued at or before issuerCertificate's notAfter timestamp |
| VerifyOrReturnError(IsTimeGreaterThanEqual(&issuerNotAfterTime, &candidateNotBeforeTime), CHIP_ERROR_CERT_EXPIRED); |
| |
| return CHIP_NO_ERROR; |
| } |
| |
| int CallbackForCustomValidityCheck(void * data, mbedtls_x509_crt * crt, int depth, uint32_t * flags) |
| { |
| mbedtls_x509_crt * leafCert = reinterpret_cast<mbedtls_x509_crt *>(data); |
| mbedtls_x509_crt * issuerCert = crt; |
| |
| // Ignore any time validy error performed by the standard mbedTLS code. |
| *flags &= ~(static_cast<uint32_t>(MBEDTLS_X509_BADCERT_EXPIRED | MBEDTLS_X509_BADCERT_FUTURE)); |
| |
| // Verify that the leaf certificate has a notBefore time valid within the validity period of the issuerCertificate. |
| // Note that this callback is invoked for each certificate in the chain. |
| if (IsCertificateValidAtIssuance(leafCert, issuerCert) != CHIP_NO_ERROR) |
| { |
| return MBEDTLS_ERR_X509_INVALID_DATE; |
| } |
| |
| return 0; |
| } |
| |
| constexpr uint8_t sOID_AttributeType_CommonName[] = { 0x55, 0x04, 0x03 }; |
| constexpr uint8_t sOID_AttributeType_MatterVendorId[] = { 0x2B, 0x06, 0x01, 0x04, 0x01, 0x82, 0xA2, 0x7C, 0x02, 0x01 }; |
| constexpr uint8_t sOID_AttributeType_MatterProductId[] = { 0x2B, 0x06, 0x01, 0x04, 0x01, 0x82, 0xA2, 0x7C, 0x02, 0x02 }; |
| constexpr uint8_t sOID_SigAlgo_ECDSAWithSHA256[] = { 0x2A, 0x86, 0x48, 0xCE, 0x3D, 0x04, 0x03, 0x02 }; |
| constexpr uint8_t sOID_Extension_BasicConstraints[] = { 0x55, 0x1D, 0x13 }; |
| constexpr uint8_t sOID_Extension_KeyUsage[] = { 0x55, 0x1D, 0x0F }; |
| constexpr uint8_t sOID_Extension_SubjectKeyIdentifier[] = { 0x55, 0x1D, 0x0E }; |
| constexpr uint8_t sOID_Extension_AuthorityKeyIdentifier[] = { 0x55, 0x1D, 0x23 }; |
| constexpr uint8_t sOID_Extension_CRLDistributionPoint[] = { 0x55, 0x1D, 0x1F }; |
| |
| /** |
| * Compares an mbedtls_asn1_buf structure (oidBuf) to a reference OID represented as uint8_t array (oid). |
| */ |
| #define OID_CMP(oid, oidBuf) \ |
| ((MBEDTLS_ASN1_OID == (oidBuf).CHIP_CRYPTO_PAL_PRIVATE_X509(tag)) && \ |
| (sizeof(oid) == (oidBuf).CHIP_CRYPTO_PAL_PRIVATE_X509(len)) && \ |
| (memcmp((oid), (oidBuf).CHIP_CRYPTO_PAL_PRIVATE_X509(p), (oidBuf).CHIP_CRYPTO_PAL_PRIVATE_X509(len)) == 0)) |
| |
| #endif // defined(MBEDTLS_X509_CRT_PARSE_C) |
| |
| } // anonymous namespace |
| |
| CHIP_ERROR VerifyAttestationCertificateFormat(const ByteSpan & cert, AttestationCertType certType) |
| { |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| CHIP_ERROR error = CHIP_NO_ERROR; |
| int result = 0; |
| mbedtls_x509_crt mbed_cert; |
| unsigned char * p = nullptr; |
| const unsigned char * end = nullptr; |
| size_t len = 0; |
| bool extBasicPresent = false; |
| bool extKeyUsagePresent = false; |
| |
| VerifyOrReturnError(!cert.empty(), CHIP_ERROR_INVALID_ARGUMENT); |
| |
| mbedtls_x509_crt_init(&mbed_cert); |
| |
| result = mbedtls_x509_crt_parse(&mbed_cert, Uint8::to_const_uchar(cert.data()), cert.size()); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); |
| |
| // "version" value is 1 higher than the actual encoded value. |
| VerifyOrExit(mbed_cert.CHIP_CRYPTO_PAL_PRIVATE_X509(version) - 1 == 2, error = CHIP_ERROR_INTERNAL); |
| |
| // Verify signature algorithms is ECDSA with SHA256. |
| VerifyOrExit(OID_CMP(sOID_SigAlgo_ECDSAWithSHA256, mbed_cert.CHIP_CRYPTO_PAL_PRIVATE_X509(sig_oid)), |
| error = CHIP_ERROR_INTERNAL); |
| |
| // Verify public key presence and format. |
| { |
| Crypto::P256PublicKey pubkey; |
| SuccessOrExit(error = ExtractPubkeyFromX509Cert(cert, pubkey)); |
| } |
| |
| p = mbed_cert.CHIP_CRYPTO_PAL_PRIVATE_X509(v3_ext).CHIP_CRYPTO_PAL_PRIVATE_X509(p); |
| end = p + mbed_cert.CHIP_CRYPTO_PAL_PRIVATE_X509(v3_ext).CHIP_CRYPTO_PAL_PRIVATE_X509(len); |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); |
| |
| while (p < end) |
| { |
| mbedtls_x509_buf extOID = { 0, 0, nullptr }; |
| int extCritical = 0; |
| |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); |
| |
| /* Get extension ID */ |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_OID); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); |
| |
| extOID.CHIP_CRYPTO_PAL_PRIVATE_X509(tag) = MBEDTLS_ASN1_OID; |
| extOID.CHIP_CRYPTO_PAL_PRIVATE_X509(len) = len; |
| extOID.CHIP_CRYPTO_PAL_PRIVATE_X509(p) = p; |
| p += len; |
| |
| /* Get optional critical */ |
| result = mbedtls_asn1_get_bool(&p, end, &extCritical); |
| VerifyOrExit(result == 0 || result == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG, error = CHIP_ERROR_INTERNAL); |
| |
| /* Data should be octet string type */ |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_OCTET_STRING); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); |
| |
| if (OID_CMP(sOID_Extension_BasicConstraints, extOID)) |
| { |
| int isCA = 0; |
| int pathLen = -1; |
| |
| VerifyOrExit(extCritical, error = CHIP_ERROR_INTERNAL); |
| extBasicPresent = true; |
| |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); |
| if (len > 0) |
| { |
| unsigned char * seqStart = p; |
| result = mbedtls_asn1_get_bool(&p, end, &isCA); |
| VerifyOrExit(result == 0 || result == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG, error = CHIP_ERROR_INTERNAL); |
| |
| // Check if pathLen is there by validating if the cursor didn't get to the end of |
| // of the internal SEQUENCE for the basic constraints encapsulation. |
| // Missing pathLen optional tag will leave pathLen == -1 for following checks. |
| bool hasPathLen = (p != (seqStart + len)); |
| if (hasPathLen) |
| { |
| // Extract pathLen value, making sure it's a valid format. |
| result = mbedtls_asn1_get_int(&p, end, &pathLen); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); |
| } |
| } |
| |
| if (certType == AttestationCertType::kDAC) |
| { |
| VerifyOrExit(!isCA && pathLen == -1, error = CHIP_ERROR_INTERNAL); |
| } |
| else if (certType == AttestationCertType::kPAI) |
| { |
| VerifyOrExit(isCA && pathLen == 0, error = CHIP_ERROR_INTERNAL); |
| } |
| else |
| { |
| // For PAA, pathlen must be absent or equal to 1 (see Matter 1.1 spec 6.2.2.5) |
| VerifyOrExit(isCA && (pathLen == -1 || pathLen == 1), error = CHIP_ERROR_INTERNAL); |
| } |
| } |
| else if (OID_CMP(sOID_Extension_KeyUsage, extOID)) |
| { |
| mbedtls_x509_bitstring bs = { 0, 0, nullptr }; |
| unsigned int keyUsage = 0; |
| |
| VerifyOrExit(extCritical, error = CHIP_ERROR_INTERNAL); |
| extKeyUsagePresent = true; |
| |
| result = mbedtls_asn1_get_bitstring(&p, p + len, &bs); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); |
| |
| for (size_t i = 0; i < bs.CHIP_CRYPTO_PAL_PRIVATE_X509(len) && i < sizeof(unsigned int); i++) |
| { |
| keyUsage |= static_cast<unsigned int>(bs.CHIP_CRYPTO_PAL_PRIVATE_X509(p)[i]) << (8 * i); |
| } |
| |
| if (certType == AttestationCertType::kDAC) |
| { |
| // SHALL only have the digitalSignature bit set. |
| VerifyOrExit(keyUsage == MBEDTLS_X509_KU_DIGITAL_SIGNATURE, error = CHIP_ERROR_INTERNAL); |
| } |
| else |
| { |
| bool keyCertSignFlag = keyUsage & MBEDTLS_X509_KU_KEY_CERT_SIGN; |
| bool crlSignFlag = keyUsage & MBEDTLS_X509_KU_CRL_SIGN; |
| bool otherFlags = keyUsage & |
| ~static_cast<unsigned int>(MBEDTLS_X509_KU_CRL_SIGN | MBEDTLS_X509_KU_KEY_CERT_SIGN | |
| MBEDTLS_X509_KU_DIGITAL_SIGNATURE); |
| VerifyOrExit(keyCertSignFlag && crlSignFlag && !otherFlags, error = CHIP_ERROR_INTERNAL); |
| } |
| } |
| else |
| { |
| p += len; |
| } |
| } |
| |
| // Verify basic and key usage extensions are present. |
| VerifyOrExit(extBasicPresent && extKeyUsagePresent, error = CHIP_ERROR_INTERNAL); |
| |
| // Verify that SKID and AKID extensions are present. |
| { |
| uint8_t kidBuf[kSubjectKeyIdentifierLength]; |
| MutableByteSpan kid(kidBuf); |
| SuccessOrExit(error = ExtractSKIDFromX509Cert(cert, kid)); |
| if (certType == AttestationCertType::kDAC || certType == AttestationCertType::kPAI) |
| { |
| // Mandatory extension for DAC and PAI certs. |
| SuccessOrExit(error = ExtractAKIDFromX509Cert(cert, kid)); |
| } |
| } |
| |
| exit: |
| _log_mbedTLS_error(result); |
| mbedtls_x509_crt_free(&mbed_cert); |
| |
| #else |
| (void) cert; |
| (void) certType; |
| CHIP_ERROR error = CHIP_ERROR_NOT_IMPLEMENTED; |
| #endif // defined(MBEDTLS_X509_CRT_PARSE_C) |
| |
| return error; |
| } |
| |
| CHIP_ERROR ValidateCertificateChain(const uint8_t * rootCertificate, size_t rootCertificateLen, const uint8_t * caCertificate, |
| size_t caCertificateLen, const uint8_t * leafCertificate, size_t leafCertificateLen, |
| CertificateChainValidationResult & result) |
| { |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| CHIP_ERROR error = CHIP_NO_ERROR; |
| mbedtls_x509_crt certChain; |
| mbedtls_x509_crt rootCert; |
| int mbedResult; |
| uint32_t flags = 0; |
| |
| result = CertificateChainValidationResult::kInternalFrameworkError; |
| |
| VerifyOrReturnError(rootCertificate != nullptr && rootCertificateLen != 0, |
| (result = CertificateChainValidationResult::kRootArgumentInvalid, CHIP_ERROR_INVALID_ARGUMENT)); |
| VerifyOrReturnError(leafCertificate != nullptr && leafCertificateLen != 0, |
| (result = CertificateChainValidationResult::kLeafArgumentInvalid, CHIP_ERROR_INVALID_ARGUMENT)); |
| |
| mbedtls_x509_crt_init(&certChain); |
| mbedtls_x509_crt_init(&rootCert); |
| |
| /* Start of chain */ |
| mbedResult = mbedtls_x509_crt_parse(&certChain, Uint8::to_const_uchar(leafCertificate), leafCertificateLen); |
| VerifyOrExit(mbedResult == 0, (result = CertificateChainValidationResult::kLeafFormatInvalid, error = CHIP_ERROR_INTERNAL)); |
| |
| /* Add the intermediate to the chain, if present */ |
| if (caCertificate != nullptr && caCertificateLen > 0) |
| { |
| mbedResult = mbedtls_x509_crt_parse(&certChain, Uint8::to_const_uchar(caCertificate), caCertificateLen); |
| VerifyOrExit(mbedResult == 0, (result = CertificateChainValidationResult::kICAFormatInvalid, error = CHIP_ERROR_INTERNAL)); |
| } |
| |
| /* Parse the root cert */ |
| mbedResult = mbedtls_x509_crt_parse(&rootCert, Uint8::to_const_uchar(rootCertificate), rootCertificateLen); |
| VerifyOrExit(mbedResult == 0, (result = CertificateChainValidationResult::kRootFormatInvalid, error = CHIP_ERROR_INTERNAL)); |
| |
| /* Verify the chain against the root */ |
| mbedResult = |
| mbedtls_x509_crt_verify(&certChain, &rootCert, nullptr, nullptr, &flags, CallbackForCustomValidityCheck, &certChain); |
| |
| switch (mbedResult) |
| { |
| case 0: |
| VerifyOrExit(flags == 0, (result = CertificateChainValidationResult::kInternalFrameworkError, error = CHIP_ERROR_INTERNAL)); |
| result = CertificateChainValidationResult::kSuccess; |
| break; |
| case MBEDTLS_ERR_X509_INVALID_DATE: |
| case MBEDTLS_ERR_X509_CERT_VERIFY_FAILED: |
| result = CertificateChainValidationResult::kChainInvalid; |
| error = CHIP_ERROR_CERT_NOT_TRUSTED; |
| break; |
| default: |
| result = CertificateChainValidationResult::kInternalFrameworkError; |
| error = CHIP_ERROR_INTERNAL; |
| break; |
| } |
| |
| exit: |
| _log_mbedTLS_error(mbedResult); |
| mbedtls_x509_crt_free(&certChain); |
| mbedtls_x509_crt_free(&rootCert); |
| |
| #else |
| (void) rootCertificate; |
| (void) rootCertificateLen; |
| (void) caCertificate; |
| (void) caCertificateLen; |
| (void) leafCertificate; |
| (void) leafCertificateLen; |
| (void) result; |
| CHIP_ERROR error = CHIP_ERROR_NOT_IMPLEMENTED; |
| #endif // defined(MBEDTLS_X509_CRT_PARSE_C) |
| |
| return error; |
| } |
| |
| CHIP_ERROR IsCertificateValidAtIssuance(const ByteSpan & candidateCertificate, const ByteSpan & issuerCertificate) |
| { |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| CHIP_ERROR error = CHIP_NO_ERROR; |
| mbedtls_x509_crt mbedCandidateCertificate; |
| mbedtls_x509_crt mbedIssuerCertificate; |
| int result; |
| |
| VerifyOrReturnError(!candidateCertificate.empty() && !issuerCertificate.empty(), CHIP_ERROR_INVALID_ARGUMENT); |
| |
| mbedtls_x509_crt_init(&mbedCandidateCertificate); |
| mbedtls_x509_crt_init(&mbedIssuerCertificate); |
| |
| result = mbedtls_x509_crt_parse(&mbedCandidateCertificate, Uint8::to_const_uchar(candidateCertificate.data()), |
| candidateCertificate.size()); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); |
| |
| result = |
| mbedtls_x509_crt_parse(&mbedIssuerCertificate, Uint8::to_const_uchar(issuerCertificate.data()), issuerCertificate.size()); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); |
| |
| // Verify that the candidateCertificate has a notBefore time valid within the validity period of the issuerCertificate. |
| SuccessOrExit(error = IsCertificateValidAtIssuance(&mbedCandidateCertificate, &mbedIssuerCertificate)); |
| |
| exit: |
| _log_mbedTLS_error(result); |
| mbedtls_x509_crt_free(&mbedCandidateCertificate); |
| mbedtls_x509_crt_free(&mbedIssuerCertificate); |
| |
| #else |
| (void) candidateCertificate; |
| (void) issuerCertificate; |
| CHIP_ERROR error = CHIP_ERROR_NOT_IMPLEMENTED; |
| #endif // defined(MBEDTLS_X509_CRT_PARSE_C) |
| |
| return error; |
| } |
| |
| CHIP_ERROR IsCertificateValidAtCurrentTime(const ByteSpan & certificate) |
| { |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| CHIP_ERROR error = CHIP_NO_ERROR; |
| mbedtls_x509_crt mbedCertificate; |
| int result; |
| |
| VerifyOrReturnError(!certificate.empty(), CHIP_ERROR_INVALID_ARGUMENT); |
| |
| mbedtls_x509_crt_init(&mbedCertificate); |
| |
| result = mbedtls_x509_crt_parse(&mbedCertificate, Uint8::to_const_uchar(certificate.data()), certificate.size()); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); |
| |
| // check if certificate's notBefore timestamp is earlier than or equal to current time. |
| result = mbedtls_x509_time_is_past(&mbedCertificate.CHIP_CRYPTO_PAL_PRIVATE_X509(valid_from)); |
| VerifyOrExit(result == 1, error = CHIP_ERROR_CERT_EXPIRED); |
| |
| // check if certificate's notAfter timestamp is later than current time. |
| result = mbedtls_x509_time_is_future(&mbedCertificate.CHIP_CRYPTO_PAL_PRIVATE_X509(valid_to)); |
| VerifyOrExit(result == 1, error = CHIP_ERROR_CERT_EXPIRED); |
| |
| exit: |
| _log_mbedTLS_error(result); |
| mbedtls_x509_crt_free(&mbedCertificate); |
| |
| #else |
| (void) certificate; |
| CHIP_ERROR error = CHIP_ERROR_NOT_IMPLEMENTED; |
| #endif // defined(MBEDTLS_X509_CRT_PARSE_C) |
| |
| return error; |
| } |
| |
| CHIP_ERROR ExtractPubkeyFromX509Cert(const ByteSpan & certificate, Crypto::P256PublicKey & pubkey) |
| { |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| CHIP_ERROR error = CHIP_NO_ERROR; |
| mbedtls_x509_crt mbed_cert; |
| mbedtls_ecp_keypair * keypair = nullptr; |
| size_t pubkey_size = 0; |
| |
| mbedtls_x509_crt_init(&mbed_cert); |
| |
| int result = mbedtls_x509_crt_parse(&mbed_cert, Uint8::to_const_uchar(certificate.data()), certificate.size()); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); |
| |
| VerifyOrExit(mbedtls_pk_get_type(&(mbed_cert.CHIP_CRYPTO_PAL_PRIVATE_X509(pk))) == MBEDTLS_PK_ECKEY, |
| error = CHIP_ERROR_INVALID_ARGUMENT); |
| |
| keypair = mbedtls_pk_ec(mbed_cert.CHIP_CRYPTO_PAL_PRIVATE_X509(pk)); |
| VerifyOrExit(keypair->CHIP_CRYPTO_PAL_PRIVATE(grp).id == MapECPGroupId(pubkey.Type()), error = CHIP_ERROR_INVALID_ARGUMENT); |
| // Copy the public key from the cert in raw point format |
| result = |
| mbedtls_ecp_point_write_binary(&keypair->CHIP_CRYPTO_PAL_PRIVATE(grp), &keypair->CHIP_CRYPTO_PAL_PRIVATE(Q), |
| MBEDTLS_ECP_PF_UNCOMPRESSED, &pubkey_size, Uint8::to_uchar(pubkey.Bytes()), pubkey.Length()); |
| |
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); |
| VerifyOrExit(pubkey_size == pubkey.Length(), error = CHIP_ERROR_INTERNAL); |
| |
| exit: |
| _log_mbedTLS_error(result); |
| mbedtls_x509_crt_free(&mbed_cert); |
| |
| #else |
| (void) certificate; |
| (void) pubkey; |
| CHIP_ERROR error = CHIP_ERROR_NOT_IMPLEMENTED; |
| #endif // defined(MBEDTLS_X509_CRT_PARSE_C) |
| |
| return error; |
| } |
| |
| namespace { |
| |
| CHIP_ERROR ExtractKIDFromX509Cert(bool extractSKID, const ByteSpan & certificate, MutableByteSpan & kid) |
| { |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| CHIP_ERROR error = CHIP_ERROR_NOT_FOUND; |
| mbedtls_x509_crt mbed_cert; |
| unsigned char * p = nullptr; |
| const unsigned char * end = nullptr; |
| size_t len = 0; |
| |
| mbedtls_x509_crt_init(&mbed_cert); |
| |
| int result = mbedtls_x509_crt_parse(&mbed_cert, Uint8::to_const_uchar(certificate.data()), certificate.size()); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); |
| |
| // TODO: The mbedTLS team is working on supporting SKID and AKID extensions processing. |
| // Once it is supported, this code should be updated. |
| |
| p = mbed_cert.CHIP_CRYPTO_PAL_PRIVATE_X509(v3_ext).CHIP_CRYPTO_PAL_PRIVATE_X509(p); |
| end = mbed_cert.CHIP_CRYPTO_PAL_PRIVATE_X509(v3_ext).CHIP_CRYPTO_PAL_PRIVATE_X509(p) + |
| mbed_cert.CHIP_CRYPTO_PAL_PRIVATE_X509(v3_ext).CHIP_CRYPTO_PAL_PRIVATE_X509(len); |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_WRONG_CERT_TYPE); |
| |
| while (p < end) |
| { |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_WRONG_CERT_TYPE); |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_OID); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_WRONG_CERT_TYPE); |
| |
| mbedtls_x509_buf extOID = { MBEDTLS_ASN1_OID, len, p }; |
| bool extractCurrentExtSKID = extractSKID && OID_CMP(sOID_Extension_SubjectKeyIdentifier, extOID); |
| bool extractCurrentExtAKID = !extractSKID && OID_CMP(sOID_Extension_AuthorityKeyIdentifier, extOID); |
| p += len; |
| |
| int is_critical = 0; |
| result = mbedtls_asn1_get_bool(&p, end, &is_critical); |
| VerifyOrExit(result == 0 || result == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG, error = CHIP_ERROR_WRONG_CERT_TYPE); |
| |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_OCTET_STRING); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_WRONG_CERT_TYPE); |
| |
| if (extractCurrentExtSKID || extractCurrentExtAKID) |
| { |
| if (extractCurrentExtSKID) |
| { |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_OCTET_STRING); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_WRONG_CERT_TYPE); |
| } |
| else |
| { |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_WRONG_CERT_TYPE); |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONTEXT_SPECIFIC); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_WRONG_CERT_TYPE); |
| // Other optional fields, authorityCertIssuer and authorityCertSerialNumber, |
| // will be skipped if present. |
| } |
| VerifyOrExit(len == kSubjectKeyIdentifierLength, error = CHIP_ERROR_WRONG_CERT_TYPE); |
| VerifyOrExit(len <= kid.size(), error = CHIP_ERROR_BUFFER_TOO_SMALL); |
| memcpy(kid.data(), p, len); |
| if (kid.size() > len) |
| { |
| kid.reduce_size(len); |
| } |
| ExitNow(error = CHIP_NO_ERROR); |
| break; |
| } |
| p += len; |
| } |
| |
| exit: |
| _log_mbedTLS_error(result); |
| mbedtls_x509_crt_free(&mbed_cert); |
| |
| #else |
| (void) certificate; |
| (void) kid; |
| CHIP_ERROR error = CHIP_ERROR_NOT_IMPLEMENTED; |
| #endif // defined(MBEDTLS_X509_CRT_PARSE_C) |
| |
| return error; |
| } |
| |
| } // namespace |
| |
| CHIP_ERROR ExtractSKIDFromX509Cert(const ByteSpan & certificate, MutableByteSpan & skid) |
| { |
| return ExtractKIDFromX509Cert(true, certificate, skid); |
| } |
| |
| CHIP_ERROR ExtractAKIDFromX509Cert(const ByteSpan & certificate, MutableByteSpan & akid) |
| { |
| return ExtractKIDFromX509Cert(false, certificate, akid); |
| } |
| |
| CHIP_ERROR ExtractCRLDistributionPointURIFromX509Cert(const ByteSpan & certificate, MutableCharSpan & cdpurl) |
| { |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| CHIP_ERROR error = CHIP_ERROR_NOT_FOUND; |
| mbedtls_x509_crt mbed_cert; |
| unsigned char * p = nullptr; |
| const unsigned char * end = nullptr; |
| size_t len = 0; |
| size_t cdpExtCount = 0; |
| |
| VerifyOrReturnError(!certificate.empty() && CanCastTo<long>(certificate.size()), CHIP_ERROR_INVALID_ARGUMENT); |
| |
| mbedtls_x509_crt_init(&mbed_cert); |
| |
| int result = mbedtls_x509_crt_parse(&mbed_cert, Uint8::to_const_uchar(certificate.data()), certificate.size()); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); |
| |
| p = mbed_cert.CHIP_CRYPTO_PAL_PRIVATE_X509(v3_ext).CHIP_CRYPTO_PAL_PRIVATE_X509(p); |
| end = mbed_cert.CHIP_CRYPTO_PAL_PRIVATE_X509(v3_ext).CHIP_CRYPTO_PAL_PRIVATE_X509(p) + |
| mbed_cert.CHIP_CRYPTO_PAL_PRIVATE_X509(v3_ext).CHIP_CRYPTO_PAL_PRIVATE_X509(len); |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_WRONG_CERT_TYPE); |
| |
| while (p < end) |
| { |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_WRONG_CERT_TYPE); |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_OID); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_WRONG_CERT_TYPE); |
| |
| mbedtls_x509_buf extOID = { MBEDTLS_ASN1_OID, len, p }; |
| bool isCurrentExtCDP = OID_CMP(sOID_Extension_CRLDistributionPoint, extOID); |
| p += len; |
| |
| int is_critical = 0; |
| result = mbedtls_asn1_get_bool(&p, end, &is_critical); |
| VerifyOrExit(result == 0 || result == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG, error = CHIP_ERROR_WRONG_CERT_TYPE); |
| |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_OCTET_STRING); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_WRONG_CERT_TYPE); |
| |
| unsigned char * end_of_ext = p + len; |
| |
| if (isCurrentExtCDP) |
| { |
| // Only one CRL Distribution Point Extension is allowed. |
| cdpExtCount++; |
| VerifyOrExit(cdpExtCount <= 1, error = CHIP_ERROR_NOT_FOUND); |
| |
| // CRL Distribution Point Extension is encoded as a sequence of DistributionPoint: |
| // CRLDistributionPoints ::= SEQUENCE SIZE (1..MAX) OF DistributionPoint |
| // |
| // This implementation only supports a single DistributionPoint (sequence of size 1), |
| // which is verified by comparing (p + len == end_of_ext) |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_NOT_FOUND); |
| VerifyOrExit(p + len == end_of_ext, error = CHIP_ERROR_NOT_FOUND); |
| |
| // The DistributionPoint is a sequence of three optional elements: |
| // DistributionPoint ::= SEQUENCE { |
| // distributionPoint [0] DistributionPointName OPTIONAL, |
| // reasons [1] ReasonFlags OPTIONAL, |
| // cRLIssuer [2] GeneralNames OPTIONAL } |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_NOT_FOUND); |
| VerifyOrExit(p + len == end_of_ext, error = CHIP_ERROR_NOT_FOUND); |
| |
| // The DistributionPointName is: |
| // DistributionPointName ::= CHOICE { |
| // fullName [0] GeneralNames, |
| // nameRelativeToCRLIssuer [1] RelativeDistinguishedName } |
| // |
| // The URI should be encoded in the fullName element. |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_NOT_FOUND); |
| |
| // GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_NOT_FOUND); |
| |
| unsigned char * end_of_general_names = p + len; |
| |
| // The CDP URI is encoded as a uniformResourceIdentifier field of the GeneralName: |
| // GeneralName ::= CHOICE { |
| // otherName [0] OtherName, |
| // rfc822Name [1] IA5String, |
| // dNSName [2] IA5String, |
| // x400Address [3] ORAddress, |
| // directoryName [4] Name, |
| // ediPartyName [5] EDIPartyName, |
| // uniformResourceIdentifier [6] IA5String, |
| // iPAddress [7] OCTET STRING, |
| // registeredID [8] OBJECT IDENTIFIER } |
| result = |
| mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_X509_SAN_UNIFORM_RESOURCE_IDENTIFIER); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_NOT_FOUND); |
| |
| // Only single URI instance in the GeneralNames is supported |
| VerifyOrExit(p + len == end_of_general_names, error = CHIP_ERROR_NOT_FOUND); |
| |
| const char * urlptr = reinterpret_cast<const char *>(p); |
| VerifyOrExit((len > strlen(kValidCDPURIHttpPrefix) && |
| strncmp(urlptr, kValidCDPURIHttpPrefix, strlen(kValidCDPURIHttpPrefix)) == 0) || |
| (len > strlen(kValidCDPURIHttpsPrefix) && |
| strncmp(urlptr, kValidCDPURIHttpsPrefix, strlen(kValidCDPURIHttpsPrefix)) == 0), |
| error = CHIP_ERROR_NOT_FOUND); |
| error = CopyCharSpanToMutableCharSpan(CharSpan(urlptr, len), cdpurl); |
| SuccessOrExit(error); |
| } |
| p = end_of_ext; |
| } |
| |
| VerifyOrExit(cdpExtCount == 1, error = CHIP_ERROR_NOT_FOUND); |
| |
| exit: |
| _log_mbedTLS_error(result); |
| mbedtls_x509_crt_free(&mbed_cert); |
| |
| #else |
| (void) certificate; |
| (void) cdpurl; |
| CHIP_ERROR error = CHIP_ERROR_NOT_IMPLEMENTED; |
| #endif // defined(MBEDTLS_X509_CRT_PARSE_C) |
| |
| return error; |
| } |
| |
| CHIP_ERROR ExtractCDPExtensionCRLIssuerFromX509Cert(const ByteSpan & certificate, MutableByteSpan & crlIssuer) |
| { |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| CHIP_ERROR error = CHIP_ERROR_NOT_FOUND; |
| mbedtls_x509_crt mbed_cert; |
| unsigned char * p = nullptr; |
| const unsigned char * end = nullptr; |
| size_t len = 0; |
| size_t cdpExtCount = 0; |
| |
| VerifyOrReturnError(!certificate.empty() && CanCastTo<long>(certificate.size()), CHIP_ERROR_INVALID_ARGUMENT); |
| |
| mbedtls_x509_crt_init(&mbed_cert); |
| |
| int result = mbedtls_x509_crt_parse(&mbed_cert, Uint8::to_const_uchar(certificate.data()), certificate.size()); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); |
| |
| p = mbed_cert.CHIP_CRYPTO_PAL_PRIVATE_X509(v3_ext).CHIP_CRYPTO_PAL_PRIVATE_X509(p); |
| end = mbed_cert.CHIP_CRYPTO_PAL_PRIVATE_X509(v3_ext).CHIP_CRYPTO_PAL_PRIVATE_X509(p) + |
| mbed_cert.CHIP_CRYPTO_PAL_PRIVATE_X509(v3_ext).CHIP_CRYPTO_PAL_PRIVATE_X509(len); |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_WRONG_CERT_TYPE); |
| |
| while (p < end) |
| { |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_WRONG_CERT_TYPE); |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_OID); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_WRONG_CERT_TYPE); |
| |
| mbedtls_x509_buf extOID = { MBEDTLS_ASN1_OID, len, p }; |
| bool isCurrentExtCDP = OID_CMP(sOID_Extension_CRLDistributionPoint, extOID); |
| p += len; |
| |
| int is_critical = 0; |
| result = mbedtls_asn1_get_bool(&p, end, &is_critical); |
| VerifyOrExit(result == 0 || result == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG, error = CHIP_ERROR_WRONG_CERT_TYPE); |
| |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_OCTET_STRING); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_WRONG_CERT_TYPE); |
| |
| unsigned char * end_of_ext = p + len; |
| |
| if (isCurrentExtCDP) |
| { |
| // Only one CRL Distribution Point Extension is allowed. |
| cdpExtCount++; |
| VerifyOrExit(cdpExtCount <= 1, error = CHIP_ERROR_NOT_FOUND); |
| |
| // CRL Distribution Point Extension is encoded as a sequence of DistributionPoint: |
| // CRLDistributionPoints ::= SEQUENCE SIZE (1..MAX) OF DistributionPoint |
| // |
| // This implementation only supports a single DistributionPoint (sequence of size 1), |
| // which is verified by comparing (p + len == end_of_ext) |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_NOT_FOUND); |
| VerifyOrExit(p + len == end_of_ext, error = CHIP_ERROR_NOT_FOUND); |
| |
| // The DistributionPoint is a sequence of three optional elements: |
| // DistributionPoint ::= SEQUENCE { |
| // distributionPoint [0] DistributionPointName OPTIONAL, |
| // reasons [1] ReasonFlags OPTIONAL, |
| // cRLIssuer [2] GeneralNames OPTIONAL } |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_NOT_FOUND); |
| VerifyOrExit(p + len == end_of_ext, error = CHIP_ERROR_NOT_FOUND); |
| |
| // If distributionPoint element presents, ignore it |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0); |
| if (result == 0) |
| { |
| p += len; |
| VerifyOrExit(p < end_of_ext, error = CHIP_ERROR_NOT_FOUND); |
| } |
| |
| // Check if cRLIssuer element present |
| result = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 2); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_NOT_FOUND); |
| |
| // The CRL Issuer is encoded as a directoryName field of the GeneralName: |
| // GeneralName ::= CHOICE { |
| // otherName [0] OtherName, |
| // rfc822Name [1] IA5String, |
| // dNSName [2] IA5String, |
| // x400Address [3] ORAddress, |
| // directoryName [4] Name, |
| // ediPartyName [5] EDIPartyName, |
| // uniformResourceIdentifier [6] IA5String, |
| // iPAddress [7] OCTET STRING, |
| // registeredID [8] OBJECT IDENTIFIER } |
| result = mbedtls_asn1_get_tag( |
| &p, end, &len, MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_X509_SAN_DIRECTORY_NAME); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_NOT_FOUND); |
| VerifyOrExit(p + len == end_of_ext, error = CHIP_ERROR_NOT_FOUND); |
| |
| error = CopySpanToMutableSpan(ByteSpan(p, len), crlIssuer); |
| SuccessOrExit(error); |
| } |
| p = end_of_ext; |
| } |
| |
| VerifyOrExit(cdpExtCount == 1, error = CHIP_ERROR_NOT_FOUND); |
| |
| exit: |
| _log_mbedTLS_error(result); |
| mbedtls_x509_crt_free(&mbed_cert); |
| |
| #else |
| (void) certificate; |
| (void) crlIssuer; |
| CHIP_ERROR error = CHIP_ERROR_NOT_IMPLEMENTED; |
| #endif // defined(MBEDTLS_X509_CRT_PARSE_C) |
| |
| return error; |
| } |
| |
| CHIP_ERROR ExtractSerialNumberFromX509Cert(const ByteSpan & certificate, MutableByteSpan & serialNumber) |
| { |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| CHIP_ERROR error = CHIP_NO_ERROR; |
| int result = 0; |
| uint8_t * p = nullptr; |
| size_t len = 0; |
| mbedtls_x509_crt mbed_cert; |
| |
| mbedtls_x509_crt_init(&mbed_cert); |
| |
| result = mbedtls_x509_crt_parse(&mbed_cert, Uint8::to_const_uchar(certificate.data()), certificate.size()); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); |
| |
| p = mbed_cert.CHIP_CRYPTO_PAL_PRIVATE_X509(serial).CHIP_CRYPTO_PAL_PRIVATE_X509(p); |
| len = mbed_cert.CHIP_CRYPTO_PAL_PRIVATE_X509(serial).CHIP_CRYPTO_PAL_PRIVATE_X509(len); |
| VerifyOrExit(len <= serialNumber.size(), error = CHIP_ERROR_BUFFER_TOO_SMALL); |
| |
| memcpy(serialNumber.data(), p, len); |
| serialNumber.reduce_size(len); |
| |
| exit: |
| _log_mbedTLS_error(result); |
| mbedtls_x509_crt_free(&mbed_cert); |
| |
| #else |
| (void) certificate; |
| (void) serialNumber; |
| CHIP_ERROR error = CHIP_ERROR_NOT_IMPLEMENTED; |
| #endif // defined(MBEDTLS_X509_CRT_PARSE_C) |
| |
| return error; |
| } |
| |
| CHIP_ERROR ExtractVIDPIDFromX509Cert(const ByteSpan & certificate, AttestationCertVidPid & vidpid) |
| { |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| CHIP_ERROR error = CHIP_NO_ERROR; |
| mbedtls_x509_crt mbed_cert; |
| mbedtls_asn1_named_data * dnIterator = nullptr; |
| AttestationCertVidPid vidpidFromCN; |
| |
| mbedtls_x509_crt_init(&mbed_cert); |
| |
| int result = mbedtls_x509_crt_parse(&mbed_cert, Uint8::to_const_uchar(certificate.data()), certificate.size()); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); |
| |
| for (dnIterator = &mbed_cert.CHIP_CRYPTO_PAL_PRIVATE_X509(subject); dnIterator != nullptr; |
| dnIterator = dnIterator->CHIP_CRYPTO_PAL_PRIVATE_X509(next)) |
| { |
| DNAttrType attrType = DNAttrType::kUnspecified; |
| if (OID_CMP(sOID_AttributeType_CommonName, dnIterator->CHIP_CRYPTO_PAL_PRIVATE_X509(oid))) |
| { |
| attrType = DNAttrType::kCommonName; |
| } |
| else if (OID_CMP(sOID_AttributeType_MatterVendorId, dnIterator->CHIP_CRYPTO_PAL_PRIVATE_X509(oid))) |
| { |
| attrType = DNAttrType::kMatterVID; |
| } |
| else if (OID_CMP(sOID_AttributeType_MatterProductId, dnIterator->CHIP_CRYPTO_PAL_PRIVATE_X509(oid))) |
| { |
| attrType = DNAttrType::kMatterPID; |
| } |
| |
| size_t val_len = dnIterator->CHIP_CRYPTO_PAL_PRIVATE_X509(val).CHIP_CRYPTO_PAL_PRIVATE_X509(len); |
| uint8_t * val_p = dnIterator->CHIP_CRYPTO_PAL_PRIVATE_X509(val).CHIP_CRYPTO_PAL_PRIVATE_X509(p); |
| error = ExtractVIDPIDFromAttributeString(attrType, ByteSpan(val_p, val_len), vidpid, vidpidFromCN); |
| SuccessOrExit(error); |
| } |
| |
| // If Matter Attributes were not found use values extracted from the CN Attribute, |
| // which might be uninitialized as well. |
| if (!vidpid.Initialized()) |
| { |
| vidpid = vidpidFromCN; |
| } |
| |
| exit: |
| _log_mbedTLS_error(result); |
| mbedtls_x509_crt_free(&mbed_cert); |
| |
| #else |
| (void) certificate; |
| (void) vidpid; |
| CHIP_ERROR error = CHIP_ERROR_NOT_IMPLEMENTED; |
| #endif // defined(MBEDTLS_X509_CRT_PARSE_C) |
| |
| return error; |
| } |
| |
| namespace { |
| CHIP_ERROR ExtractRawDNFromX509Cert(bool extractSubject, const ByteSpan & certificate, MutableByteSpan & dn) |
| { |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| CHIP_ERROR error = CHIP_NO_ERROR; |
| int result = 0; |
| uint8_t * p = nullptr; |
| size_t len = 0; |
| mbedtls_x509_crt mbedCertificate; |
| |
| VerifyOrReturnError(!certificate.empty(), CHIP_ERROR_INVALID_ARGUMENT); |
| |
| mbedtls_x509_crt_init(&mbedCertificate); |
| result = mbedtls_x509_crt_parse(&mbedCertificate, Uint8::to_const_uchar(certificate.data()), certificate.size()); |
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); |
| |
| if (extractSubject) |
| { |
| len = mbedCertificate.CHIP_CRYPTO_PAL_PRIVATE_X509(subject_raw).CHIP_CRYPTO_PAL_PRIVATE_X509(len); |
| p = mbedCertificate.CHIP_CRYPTO_PAL_PRIVATE_X509(subject_raw).CHIP_CRYPTO_PAL_PRIVATE_X509(p); |
| } |
| else |
| { |
| len = mbedCertificate.CHIP_CRYPTO_PAL_PRIVATE_X509(issuer_raw).CHIP_CRYPTO_PAL_PRIVATE_X509(len); |
| p = mbedCertificate.CHIP_CRYPTO_PAL_PRIVATE_X509(issuer_raw).CHIP_CRYPTO_PAL_PRIVATE_X509(p); |
| } |
| |
| VerifyOrExit(len <= dn.size(), error = CHIP_ERROR_BUFFER_TOO_SMALL); |
| memcpy(dn.data(), p, len); |
| dn.reduce_size(len); |
| |
| exit: |
| _log_mbedTLS_error(result); |
| mbedtls_x509_crt_free(&mbedCertificate); |
| |
| #else |
| (void) certificate; |
| (void) dn; |
| CHIP_ERROR error = CHIP_ERROR_NOT_IMPLEMENTED; |
| #endif // defined(MBEDTLS_X509_CRT_PARSE_C) |
| |
| return error; |
| } |
| } // namespace |
| |
| CHIP_ERROR ExtractSubjectFromX509Cert(const ByteSpan & certificate, MutableByteSpan & subject) |
| { |
| return ExtractRawDNFromX509Cert(true, certificate, subject); |
| } |
| |
| CHIP_ERROR ExtractIssuerFromX509Cert(const ByteSpan & certificate, MutableByteSpan & issuer) |
| { |
| return ExtractRawDNFromX509Cert(false, certificate, issuer); |
| } |
| |
| CHIP_ERROR ReplaceCertIfResignedCertFound(const ByteSpan & referenceCertificate, const ByteSpan * candidateCertificates, |
| size_t candidateCertificatesCount, ByteSpan & outCertificate) |
| { |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| uint8_t referenceSubjectBuf[kMaxCertificateDistinguishedNameLength]; |
| uint8_t referenceSKIDBuf[kSubjectKeyIdentifierLength]; |
| MutableByteSpan referenceSubject(referenceSubjectBuf); |
| MutableByteSpan referenceSKID(referenceSKIDBuf); |
| |
| outCertificate = referenceCertificate; |
| |
| VerifyOrReturnError(candidateCertificates != nullptr && candidateCertificatesCount != 0, CHIP_NO_ERROR); |
| |
| ReturnErrorOnFailure(ExtractSubjectFromX509Cert(referenceCertificate, referenceSubject)); |
| ReturnErrorOnFailure(ExtractSKIDFromX509Cert(referenceCertificate, referenceSKID)); |
| |
| for (size_t i = 0; i < candidateCertificatesCount; i++) |
| { |
| const ByteSpan candidateCertificate = candidateCertificates[i]; |
| uint8_t candidateSubjectBuf[kMaxCertificateDistinguishedNameLength]; |
| uint8_t candidateSKIDBuf[kSubjectKeyIdentifierLength]; |
| MutableByteSpan candidateSubject(candidateSubjectBuf); |
| MutableByteSpan candidateSKID(candidateSKIDBuf); |
| |
| ReturnErrorOnFailure(ExtractSubjectFromX509Cert(candidateCertificate, candidateSubject)); |
| ReturnErrorOnFailure(ExtractSKIDFromX509Cert(candidateCertificate, candidateSKID)); |
| |
| if (referenceSKID.data_equal(candidateSKID) && referenceSubject.data_equal(candidateSubject)) |
| { |
| outCertificate = candidateCertificate; |
| return CHIP_NO_ERROR; |
| } |
| } |
| |
| return CHIP_NO_ERROR; |
| #else |
| (void) referenceCertificate; |
| (void) candidateCertificates; |
| (void) candidateCertificatesCount; |
| (void) outCertificate; |
| return CHIP_ERROR_NOT_IMPLEMENTED; |
| #endif // defined(MBEDTLS_X509_CRT_PARSE_C) |
| } |
| |
| } // namespace Crypto |
| } // namespace chip |
