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
diff --git a/identity/aidl/vts/VtsAttestationParserSupport.cpp b/identity/aidl/vts/VtsAttestationParserSupport.cpp
new file mode 100644
index 0000000..71fe733
--- /dev/null
+++ b/identity/aidl/vts/VtsAttestationParserSupport.cpp
@@ -0,0 +1,187 @@
+/*
+ * 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
diff --git a/identity/aidl/vts/VtsAttestationParserSupport.h b/identity/aidl/vts/VtsAttestationParserSupport.h
new file mode 100644
index 0000000..7c7e1b6
--- /dev/null
+++ b/identity/aidl/vts/VtsAttestationParserSupport.h
@@ -0,0 +1,122 @@
+
+/*
+ * 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
diff --git a/identity/aidl/vts/VtsAttestationTests.cpp b/identity/aidl/vts/VtsAttestationTests.cpp
new file mode 100644
index 0000000..00b5893
--- /dev/null
+++ b/identity/aidl/vts/VtsAttestationTests.cpp
@@ -0,0 +1,188 @@
+/*
+ * 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