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Commit 38ca6961 authored by Selene Huang's avatar Selene Huang Committed by David Zeuthen
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Add attestation certificate parsing and validate for IC vts. 

 - Added attestation certificate parsing support.
 - Added various certificate conversion support.
 - Added certification verification support.
 - Added tests for the attestation certificate verification.
 - Updated the old tests to use the new attestation validation
   implementation.
 - Updated GenerateReaderCertificate to use pointer reader private key.

Bug: 154909726
Test: VtsHalIdentityTargetTest
Test: atest android.security.identity.cts
Merged-In: Ibe770e6eaf0b0018d60876926d824204e4eaf732
Change-Id: I5d87622cc43241d1e2de59cd1c0f33630e4fcbab
parent fc7b29c5

identity/aidl/vts/VtsAttestationParserSupport.cpp

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/*

 * Copyright 2019, The Android Open Source Project

 *

 * 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 "VtsAttestationParserSupport.h"



#include <aidl/Gtest.h>

#include <map>



namespace android::hardware::identity::test_utils {



using std::endl;

using std::map;

using std::optional;

using std::string;

using std::vector;



using ::android::sp;

using ::android::String16;

using ::android::binder::Status;



using ::keymaster::ASN1_OBJECT_Ptr;

using ::keymaster::AuthorizationSet;

using ::keymaster::EVP_PKEY_Ptr;

using ::keymaster::kAttestionRecordOid;

using ::keymaster::TAG_ATTESTATION_APPLICATION_ID;

using ::keymaster::TAG_IDENTITY_CREDENTIAL_KEY;

using ::keymaster::TAG_INCLUDE_UNIQUE_ID;

using ::keymaster::TypedTag;

using ::keymaster::X509_Ptr;



using support::certificateChainSplit;



optional<keymaster_cert_chain_t> AttestationCertificateParser::certificateChainToKeymasterChain(

        const vector<Certificate>& certificates) {

    if (certificates.size() <= 0) {

        return {};

    }



    keymaster_cert_chain_t kCert;

    kCert.entry_count = certificates.size();

    kCert.entries = (keymaster_blob_t*)malloc(sizeof(keymaster_blob_t) * kCert.entry_count);



    int index = 0;

    for (const auto& c : certificates) {

        kCert.entries[index].data_length = c.encodedCertificate.size();

        uint8_t* data = (uint8_t*)malloc(c.encodedCertificate.size());



        memcpy(data, c.encodedCertificate.data(), c.encodedCertificate.size());

        kCert.entries[index].data = (const uint8_t*)data;

        index++;

    }



    return kCert;

}



bool AttestationCertificateParser::parse() {

    optional<keymaster_cert_chain_t> cert_chain = certificateChainToKeymasterChain(origCertChain_);

    if (!cert_chain) {

        return false;

    }



    if (cert_chain.value().entry_count < 3) {

        return false;

    }



    if (!verifyChain(cert_chain.value())) {

        return false;

    }



    if (!verifyAttestationRecord(cert_chain.value().entries[0])) {

        return false;

    }



    keymaster_free_cert_chain(&cert_chain.value());

    return true;

}



ASN1_OCTET_STRING* AttestationCertificateParser::getAttestationRecord(X509* certificate) {

    ASN1_OBJECT_Ptr oid(OBJ_txt2obj(kAttestionRecordOid, 1));

    if (!oid.get()) return nullptr;



    int location = X509_get_ext_by_OBJ(certificate, oid.get(), -1);

    if (location == -1) return nullptr;



    X509_EXTENSION* attest_rec_ext = X509_get_ext(certificate, location);

    if (!attest_rec_ext) return nullptr;



    ASN1_OCTET_STRING* attest_rec = X509_EXTENSION_get_data(attest_rec_ext);

    return attest_rec;

}



X509* AttestationCertificateParser::parseCertBlob(const keymaster_blob_t& blob) {

    const uint8_t* p = blob.data;

    return d2i_X509(nullptr, &p, blob.data_length);

}



bool AttestationCertificateParser::verifyAttestationRecord(

        const keymaster_blob_t& attestation_cert) {

    X509_Ptr cert(parseCertBlob(attestation_cert));

    if (!cert.get()) {

        return false;

    }



    ASN1_OCTET_STRING* attest_rec = getAttestationRecord(cert.get());

    if (!attest_rec) {

        return false;

    }



    keymaster_blob_t att_unique_id = {};

    keymaster_blob_t att_challenge;

    keymaster_error_t ret = parse_attestation_record(

            attest_rec->data, attest_rec->length, &att_attestation_version_,

            &att_attestation_security_level_, &att_keymaster_version_,

            &att_keymaster_security_level_, &att_challenge, &att_sw_enforced_, &att_hw_enforced_,

            &att_unique_id);

    if (ret) {

        return false;

    }



    att_challenge_.assign(att_challenge.data, att_challenge.data + att_challenge.data_length);

    return true;

}



uint32_t AttestationCertificateParser::getKeymasterVersion() {

    return att_keymaster_version_;

}



uint32_t AttestationCertificateParser::getAttestationVersion() {

    return att_attestation_version_;

}



vector<uint8_t> AttestationCertificateParser::getAttestationChallenge() {

    return att_challenge_;

}



keymaster_security_level_t AttestationCertificateParser::getKeymasterSecurityLevel() {

    return att_keymaster_security_level_;

}



keymaster_security_level_t AttestationCertificateParser::getAttestationSecurityLevel() {

    return att_attestation_security_level_;

}



// Verify the Attestation certificates are correctly chained.

bool AttestationCertificateParser::verifyChain(const keymaster_cert_chain_t& chain) {

    for (size_t i = 0; i < chain.entry_count - 1; ++i) {

        keymaster_blob_t& key_cert_blob = chain.entries[i];

        keymaster_blob_t& signing_cert_blob = chain.entries[i + 1];



        X509_Ptr key_cert(parseCertBlob(key_cert_blob));

        X509_Ptr signing_cert(parseCertBlob(signing_cert_blob));

        if (!key_cert.get() || !signing_cert.get()) {

            return false;

        }



        EVP_PKEY_Ptr signing_pubkey(X509_get_pubkey(signing_cert.get()));

        if (!signing_pubkey.get()) return false;



        if (X509_verify(key_cert.get(), signing_pubkey.get()) != 1) {

            return false;

        }



        if (i + 1 == chain.entry_count - 1) {

            // Last entry is self-signed.

            if (X509_verify(signing_cert.get(), signing_pubkey.get()) != 1) {

                return false;

            }

        }

    }



    return true;

}



}  // namespace android::hardware::identity::test_utils

identity/aidl/vts/VtsAttestationParserSupport.h

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/*

 * Copyright 2019, The Android Open Source Project

 *

 * 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.

 */



#ifndef VTS_ATTESTATION_PARSER_SUPPORT_H

#define VTS_ATTESTATION_PARSER_SUPPORT_H



//#include <aidl/Gtest.h>

#include <android/hardware/identity/IIdentityCredentialStore.h>

#include <android/hardware/identity/support/IdentityCredentialSupport.h>

#include <android/hardware/keymaster/4.0/types.h>

#include <hardware/keymaster_defs.h>

#include <keymaster/android_keymaster_utils.h>

#include <keymaster/authorization_set.h>

#include <keymaster/contexts/pure_soft_keymaster_context.h>

#include <keymaster/contexts/soft_attestation_cert.h>

#include <keymaster/keymaster_tags.h>

#include <keymaster/km_openssl/attestation_utils.h>

#include <vector>



namespace android::hardware::identity::test_utils {



using ::std::optional;

using ::std::string;

using ::std::vector;



using ::keymaster::AuthorizationSet;

using ::keymaster::TypedTag;



class AttestationCertificateParser {

  public:

    AttestationCertificateParser(const vector<Certificate>& certChain)

        : origCertChain_(certChain) {}



    bool parse();



    uint32_t getKeymasterVersion();

    uint32_t getAttestationVersion();

    vector<uint8_t> getAttestationChallenge();

    keymaster_security_level_t getKeymasterSecurityLevel();

    keymaster_security_level_t getAttestationSecurityLevel();



    template <keymaster_tag_t Tag>

    bool getSwEnforcedBool(TypedTag<KM_BOOL, Tag> tag) {

        if (att_sw_enforced_.GetTagValue(tag)) {

            return true;

        }



        return false;

    }



    template <keymaster_tag_t Tag>

    bool getHwEnforcedBool(TypedTag<KM_BOOL, Tag> tag) {

        if (att_hw_enforced_.GetTagValue(tag)) {

            return true;

        }



        return false;

    }



    template <keymaster_tag_t Tag>

    optional<vector<uint8_t>> getHwEnforcedBlob(TypedTag<KM_BYTES, Tag> tag) {

        keymaster_blob_t blob;

        if (att_hw_enforced_.GetTagValue(tag, &blob)) {

            return {};

        }



        vector<uint8_t> ret(blob.data, blob.data + blob.data_length);

        return ret;

    }



    template <keymaster_tag_t Tag>

    optional<vector<uint8_t>> getSwEnforcedBlob(TypedTag<KM_BYTES, Tag> tag) {

        keymaster_blob_t blob;

        if (!att_sw_enforced_.GetTagValue(tag, &blob)) {

            return {};

        }



        vector<uint8_t> ret(blob.data, blob.data + blob.data_length);

        return ret;

    }



  private:

    // Helper functions.

    bool verifyChain(const keymaster_cert_chain_t& chain);



    ASN1_OCTET_STRING* getAttestationRecord(X509* certificate);



    X509* parseCertBlob(const keymaster_blob_t& blob);



    bool verifyAttestationRecord(const keymaster_blob_t& attestation_cert);



    optional<keymaster_cert_chain_t> certificateChainToKeymasterChain(

            const vector<Certificate>& certificates);



    // Private variables.

    vector<Certificate> origCertChain_;

    AuthorizationSet att_sw_enforced_;

    AuthorizationSet att_hw_enforced_;

    uint32_t att_attestation_version_;

    uint32_t att_keymaster_version_;

    keymaster_security_level_t att_attestation_security_level_;

    keymaster_security_level_t att_keymaster_security_level_;

    vector<uint8_t> att_challenge_;

};



}  // namespace android::hardware::identity::test_utils



#endif  // VTS_ATTESTATION_PARSER_SUPPORT_H

identity/aidl/vts/VtsAttestationTests.cpp

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/*

 * Copyright (C) 2019 The Android Open Source Project

 *

 * 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.

 */



#define LOG_TAG "VtsAttestationTests"



#include <aidl/Gtest.h>

#include <aidl/Vintf.h>

#include <android-base/logging.h>

#include <android/hardware/identity/IIdentityCredentialStore.h>

#include <android/hardware/identity/support/IdentityCredentialSupport.h>

#include <binder/IServiceManager.h>

#include <binder/ProcessState.h>

#include <cppbor.h>

#include <cppbor_parse.h>

#include <gtest/gtest.h>

#include <future>

#include <map>



#include "VtsAttestationParserSupport.h"

#include "VtsIdentityTestUtils.h"



namespace android::hardware::identity {



using std::endl;

using std::map;

using std::optional;

using std::string;

using std::vector;



using ::android::sp;

using ::android::String16;

using ::android::binder::Status;



using test_utils::AttestationCertificateParser;

using test_utils::setupWritableCredential;

using test_utils::validateAttestationCertificate;



// This file verifies the Identity Credential VTS Attestation Certificate

// generated.

class VtsAttestationTests : public testing::TestWithParam<std::string> {

  public:

    virtual void SetUp() override {

        credentialStore_ = android::waitForDeclaredService<IIdentityCredentialStore>(

                String16(GetParam().c_str()));

        ASSERT_NE(credentialStore_, nullptr);

    }



    sp<IIdentityCredentialStore> credentialStore_;

};



TEST_P(VtsAttestationTests, verifyAttestationWithEmptyChallengeEmptyId) {

    Status result;



    HardwareInformation hwInfo;

    ASSERT_TRUE(credentialStore_->getHardwareInformation(&hwInfo).isOk());



    sp<IWritableIdentityCredential> writableCredential;

    ASSERT_TRUE(test_utils::setupWritableCredential(writableCredential, credentialStore_));



    vector<uint8_t> attestationChallenge;

    vector<Certificate> attestationCertificate;

    vector<uint8_t> attestationApplicationId = {};

    result = writableCredential->getAttestationCertificate(

            attestationApplicationId, attestationChallenge, &attestationCertificate);



    ASSERT_TRUE(result.isOk()) << result.exceptionCode() << "; " << result.exceptionMessage()

                               << endl;



    EXPECT_TRUE(validateAttestationCertificate(attestationCertificate, attestationChallenge,

                                               attestationApplicationId, hwInfo));

}



TEST_P(VtsAttestationTests, verifyAttestationWithEmptyChallengeNonemptyId) {

    Status result;



    HardwareInformation hwInfo;

    ASSERT_TRUE(credentialStore_->getHardwareInformation(&hwInfo).isOk());



    sp<IWritableIdentityCredential> writableCredential;

    ASSERT_TRUE(setupWritableCredential(writableCredential, credentialStore_));



    vector<uint8_t> attestationChallenge;

    vector<Certificate> attestationCertificate;

    string applicationId = "Attestation Verification";

    vector<uint8_t> attestationApplicationId = {applicationId.begin(), applicationId.end()};



    result = writableCredential->getAttestationCertificate(

            attestationApplicationId, attestationChallenge, &attestationCertificate);



    ASSERT_TRUE(result.isOk()) << result.exceptionCode() << "; " << result.exceptionMessage()

                               << endl;

    EXPECT_TRUE(validateAttestationCertificate(attestationCertificate, attestationChallenge,

                                               attestationApplicationId, hwInfo));

}



TEST_P(VtsAttestationTests, verifyAttestationWithNonemptyChallengeEmptyId) {

    Status result;



    HardwareInformation hwInfo;

    ASSERT_TRUE(credentialStore_->getHardwareInformation(&hwInfo).isOk());



    sp<IWritableIdentityCredential> writableCredential;

    ASSERT_TRUE(setupWritableCredential(writableCredential, credentialStore_));



    string challenge = "NotSoRandomChallenge";

    vector<uint8_t> attestationChallenge(challenge.begin(), challenge.end());

    vector<Certificate> attestationCertificate;

    vector<uint8_t> attestationApplicationId = {};



    result = writableCredential->getAttestationCertificate(

            attestationApplicationId, attestationChallenge, &attestationCertificate);



    ASSERT_TRUE(result.isOk()) << result.exceptionCode() << "; " << result.exceptionMessage()

                               << endl;



    EXPECT_TRUE(validateAttestationCertificate(attestationCertificate, attestationChallenge,

                                               attestationApplicationId, hwInfo));

}



TEST_P(VtsAttestationTests, verifyAttestationWithNonemptyChallengeNonemptyId) {

    Status result;



    HardwareInformation hwInfo;

    ASSERT_TRUE(credentialStore_->getHardwareInformation(&hwInfo).isOk());



    sp<IWritableIdentityCredential> writableCredential;

    ASSERT_TRUE(setupWritableCredential(writableCredential, credentialStore_));



    string challenge = "NotSoRandomChallenge1NotSoRandomChallenge1NotSoRandomChallenge1";

    vector<uint8_t> attestationChallenge(challenge.begin(), challenge.end());

    vector<Certificate> attestationCertificate;

    string applicationId = "Attestation Verification";

    vector<uint8_t> attestationApplicationId = {applicationId.begin(), applicationId.end()};



    result = writableCredential->getAttestationCertificate(

            attestationApplicationId, attestationChallenge, &attestationCertificate);



    ASSERT_TRUE(result.isOk()) << result.exceptionCode() << "; " << result.exceptionMessage()

                               << endl;



    EXPECT_TRUE(validateAttestationCertificate(attestationCertificate, attestationChallenge,

                                               attestationApplicationId, hwInfo));

}



TEST_P(VtsAttestationTests, verifyAttestationWithVeryShortChallengeAndId) {

    Status result;



    HardwareInformation hwInfo;

    ASSERT_TRUE(credentialStore_->getHardwareInformation(&hwInfo).isOk());



    sp<IWritableIdentityCredential> writableCredential;

    ASSERT_TRUE(setupWritableCredential(writableCredential, credentialStore_));



    string challenge = "c";

    vector<uint8_t> attestationChallenge(challenge.begin(), challenge.end());

    vector<Certificate> attestationCertificate;

    string applicationId = "i";

    vector<uint8_t> attestationApplicationId = {applicationId.begin(), applicationId.end()};



    result = writableCredential->getAttestationCertificate(

            attestationApplicationId, attestationChallenge, &attestationCertificate);



    ASSERT_TRUE(result.isOk()) << result.exceptionCode() << "; " << result.exceptionMessage()

                               << endl;



    EXPECT_TRUE(validateAttestationCertificate(attestationCertificate, attestationChallenge,

                                               attestationApplicationId, hwInfo));

}



INSTANTIATE_TEST_SUITE_P(

        Identity, VtsAttestationTests,

        testing::ValuesIn(android::getAidlHalInstanceNames(IIdentityCredentialStore::descriptor)),

        android::PrintInstanceNameToString);



}  // namespace android::hardware::identity