identity: fix access control checks in libeic. (af7e9cfb) · Commits · e / os / android_hardware_interfaces

identity/TEST_MAPPING

+3 −0

Original line number	Diff line number	Diff line
		@@ -8,6 +8,9 @@
		},
		{
		"name": "android.hardware.identity-support-lib-test"
		},
		{
		"name": "libeic_test"
		}
		]
		}

identity/aidl/default/Android.bp

+37 −0

Original line number	Diff line number	Diff line
		@@ -114,6 +114,43 @@ cc_binary {
		],
		}

		cc_test {
		name: "libeic_test",
		srcs: [
		"EicTests.cpp",
		"FakeSecureHardwareProxy.cpp",
		],
		cflags: [
		"-Wall",
		"-Wextra",
		"-g",
		"-DEIC_DEBUG",
		],
		local_include_dirs: [
		"common",
		],
		shared_libs: [
		"liblog",
		"libcrypto",
		"libkeymaster_messages",
		],
		static_libs: [
		"libbase",
		"libcppbor_external",
		"libcppcose_rkp",
		"libutils",
		"libsoft_attestation_cert",
		"libkeymaster_portable",
		"libsoft_attestation_cert",
		"libpuresoftkeymasterdevice",
		"android.hardware.identity-support-lib",
		"android.hardware.identity-libeic-library",
		],
		test_suites: [
		"general-tests",
		],
		}

		prebuilt_etc {
		name: "android.hardware.identity_credential.xml",
		sub_dir: "permissions",

identity/aidl/default/EicTests.cpp

0 → 100644

+85 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (c) 2021, 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 <gtest/gtest.h>
		#include <optional>
		#include <string>
		#include <vector>

		#include "FakeSecureHardwareProxy.h"

		// Most of libeic is tested as part of VTS since there's almost a 1:1 mapping between
		// the HAL and libeic interfaces. This test suite is mainly for the few things which
		// doesn't map directly.
		//

		using std::optional;
		using std::string;
		using std::vector;

		using android::hardware::identity::AccessCheckResult;
		using android::hardware::identity::FakeSecureHardwarePresentationProxy;
		using android::hardware::identity::FakeSecureHardwareProvisioningProxy;

		TEST(EicTest, AccessControlIsEnforced) {
		// First provision the credential...
		//
		FakeSecureHardwareProvisioningProxy provisioningProxy;
		bool isTestCredential = false;
		provisioningProxy.initialize(isTestCredential);
		optional<vector<uint8_t>> credKey =
		provisioningProxy.createCredentialKey({0x01, 0x02}, {0x03, 0x04});
		ASSERT_TRUE(credKey.has_value());
		string docType = "org.iso.18013.5.1.mDL";
		ASSERT_TRUE(provisioningProxy.startPersonalization(0, {1}, docType, 125));

		vector<int> acpIds = {};
		string nameSpace = "org.iso.18013.5.1";
		string name = "NonAccessibleElement";
		vector<uint8_t> content = {0x63, 0x46, 0x6f, 0x6f}; // "Foo" tstr
		ASSERT_TRUE(provisioningProxy.beginAddEntry(acpIds, nameSpace, name, content.size()));
		optional<vector<uint8_t>> encContent =
		provisioningProxy.addEntryValue(acpIds, nameSpace, name, content);
		ASSERT_TRUE(encContent.has_value());
		ASSERT_EQ(encContent->size(), content.size() + 28);

		optional<vector<uint8_t>> signatureOfToBeSigned = provisioningProxy.finishAddingEntries();
		ASSERT_TRUE(signatureOfToBeSigned.has_value());

		optional<vector<uint8_t>> credData = provisioningProxy.finishGetCredentialData(docType);
		ASSERT_TRUE(credData.has_value());
		ASSERT_TRUE(provisioningProxy.shutdown());

		// Then present data from it...
		//
		FakeSecureHardwarePresentationProxy presentationProxy;
		ASSERT_TRUE(presentationProxy.initialize(isTestCredential, docType, credData.value()));
		AccessCheckResult res =
		presentationProxy.startRetrieveEntryValue(nameSpace, name, 1, content.size(), acpIds);
		ASSERT_EQ(res, AccessCheckResult::kNoAccessControlProfiles);

		// Ensure that we can't get the data out if startRetrieveEntryValue() returned
		// something other than kOk... See b/190757775 for details.
		//
		optional<vector<uint8_t>> decContent =
		presentationProxy.retrieveEntryValue(encContent.value(), nameSpace, name, acpIds);
		ASSERT_FALSE(decContent.has_value());
		}

		int main(int argc, char** argv) {
		::testing::InitGoogleTest(&argc, argv);
		return RUN_ALL_TESTS();
		}

identity/aidl/default/libeic/EicPresentation.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -633,6 +633,8 @@ EicAccessCheckResult eicPresentationStartRetrieveEntryValue(

		// We'll need to calc and store a digest of additionalData to check that it's the same
		// additionalData being passed in for every eicPresentationRetrieveEntryValue() call...
		//
		ctx->accessCheckOk = false;
		if (!eicCborCalcEntryAdditionalData(accessControlProfileIds, numAccessControlProfileIds,
		nameSpace, name, additionalDataCbor,
		additionalDataCborBufSize, &additionalDataCborSize,
		@@ -680,6 +682,7 @@ EicAccessCheckResult eicPresentationStartRetrieveEntryValue(

		if (result == EIC_ACCESS_CHECK_RESULT_OK) {
		eicCborAppendString(&ctx->cbor, name);
		ctx->accessCheckOk = true;
		}
		return result;
		}
		@@ -702,10 +705,15 @@ bool eicPresentationRetrieveEntryValue(EicPresentation* ctx, const uint8_t* encr
		calculatedSha256)) {
		return false;
		}

		if (eicCryptoMemCmp(calculatedSha256, ctx->additionalDataSha256, EIC_SHA256_DIGEST_SIZE) != 0) {
		eicDebug("SHA-256 mismatch of additionalData");
		return false;
		}
		if (!ctx->accessCheckOk) {
		eicDebug("Attempting to retrieve a value for which access is not granted");
		return false;
		}

		if (!eicOpsDecryptAes128Gcm(ctx->storageKey, encryptedContent, encryptedContentSize,
		additionalDataCbor, additionalDataCborSize, content)) {

identity/aidl/default/libeic/EicPresentation.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -70,6 +70,10 @@ typedef struct {
		// Set to true initialized as a test credential.
		bool testCredential;

		// Set to true if the evaluation of access control checks in
		// eicPresentationStartRetrieveEntryValue() resulted EIC_ACCESS_CHECK_RESULT_OK
		bool accessCheckOk;

		// These are bitmasks indicating which of the possible 32 access control profiles are
		// authorized. They are built up by eicPresentationValidateAccessControlProfile().
		//