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https://github.com/Evolution-X/hardware_interfaces
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eacb1c16f1
To help with error reporting on the RKP servers in the future it will be helpful to be able to address CSRs by serial number when possible. Bug: 264302050 Test: libkeymint_remote_prov_support_test and sent JSON to server Change-Id: I2808441c200d0679e618580abc464cd3c71c220e
254 lines
10 KiB
C++
254 lines
10 KiB
C++
/*
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* Copyright 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "cppbor.h"
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#include "keymaster/cppcose/cppcose.h"
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#include <aidl/android/hardware/security/keymint/RpcHardwareInfo.h>
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#include <android-base/properties.h>
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#include <cppbor_parse.h>
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#include <cstdint>
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#include <gmock/gmock.h>
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#include <gtest/gtest.h>
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#include <keymaster/android_keymaster_utils.h>
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#include <keymaster/logger.h>
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#include <keymaster/remote_provisioning_utils.h>
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#include <openssl/curve25519.h>
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#include <remote_prov/remote_prov_utils.h>
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namespace aidl::android::hardware::security::keymint::remote_prov {
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namespace {
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using ::keymaster::KeymasterBlob;
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using ::keymaster::kStatusFailed;
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using ::keymaster::kStatusInvalidEek;
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using ::keymaster::StatusOr;
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using ::testing::ElementsAreArray;
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using byte_view = std::basic_string_view<uint8_t>;
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struct KeyInfoEcdsa {
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CoseKeyCurve curve;
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byte_view pubKeyX;
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byte_view pubKeyY;
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bool operator==(const KeyInfoEcdsa& other) const {
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return curve == other.curve && pubKeyX == other.pubKeyX && pubKeyY == other.pubKeyY;
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}
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};
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// The production root signing key for Google ECDSA P256 Endpoint Encryption Key cert chains.
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inline constexpr uint8_t kEcdsa256GeekRootX[] = {
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0xf7, 0x14, 0x8a, 0xdb, 0x97, 0xf4, 0xcc, 0x53, 0xef, 0xd2, 0x64, 0x11, 0xc4, 0xe3, 0x75, 0x1f,
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0x66, 0x1f, 0xa4, 0x71, 0x0c, 0x6c, 0xcf, 0xfa, 0x09, 0x46, 0x80, 0x74, 0x87, 0x54, 0xf2, 0xad};
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inline constexpr uint8_t kEcdsa256GeekRootY[] = {
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0x5e, 0x7f, 0x5b, 0xf6, 0xec, 0xe4, 0xf6, 0x19, 0xcc, 0xff, 0x13, 0x37, 0xfd, 0x0f, 0xa1, 0xc8,
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0x93, 0xdb, 0x18, 0x06, 0x76, 0xc4, 0x5d, 0xe6, 0xd7, 0x6a, 0x77, 0x86, 0xc3, 0x2d, 0xaf, 0x8f};
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// Hard-coded set of acceptable public COSE_Keys that can act as roots of EEK chains.
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inline constexpr KeyInfoEcdsa kAuthorizedEcdsa256EekRoots[] = {
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{CoseKeyCurve::P256, byte_view(kEcdsa256GeekRootX, sizeof(kEcdsa256GeekRootX)),
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byte_view(kEcdsa256GeekRootY, sizeof(kEcdsa256GeekRootY))},
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};
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static ErrMsgOr<CoseKey> parseEcdh256(const bytevec& coseKey) {
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auto key = CoseKey::parse(coseKey, EC2, ECDH_ES_HKDF_256, P256);
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if (!key) return key;
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auto& pubkey_x = key->getMap().get(cppcose::CoseKey::PUBKEY_X);
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auto& pubkey_y = key->getMap().get(cppcose::CoseKey::PUBKEY_Y);
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if (!pubkey_x || !pubkey_y || !pubkey_x->asBstr() || !pubkey_y->asBstr() ||
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pubkey_x->asBstr()->value().size() != 32 || pubkey_y->asBstr()->value().size() != 32) {
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return "Invalid P256 public key";
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}
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return key;
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}
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StatusOr<std::tuple<std::vector<uint8_t> /* EEK pubX */, std::vector<uint8_t> /* EEK pubY */,
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std::vector<uint8_t> /* EEK ID */>>
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validateAndExtractEcdsa256EekPubAndId(bool testMode,
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const KeymasterBlob& endpointEncryptionCertChain) {
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auto [item, newPos, errMsg] =
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cppbor::parse(endpointEncryptionCertChain.begin(), endpointEncryptionCertChain.end());
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if (!item || !item->asArray()) {
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return kStatusFailed;
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}
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const cppbor::Array* certArr = item->asArray();
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std::vector<uint8_t> lastPubKey;
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for (size_t i = 0; i < certArr->size(); ++i) {
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auto cosePubKey =
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verifyAndParseCoseSign1(certArr->get(i)->asArray(), lastPubKey, {} /* AAD */);
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if (!cosePubKey) {
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return kStatusInvalidEek;
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}
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lastPubKey = *std::move(cosePubKey);
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// In prod mode the first pubkey should match a well-known Google public key.
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if (!testMode && i == 0) {
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auto parsedPubKey = CoseKey::parse(lastPubKey);
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if (!parsedPubKey) {
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return kStatusFailed;
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}
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auto curve = parsedPubKey->getIntValue(CoseKey::CURVE);
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if (!curve) {
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return kStatusInvalidEek;
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}
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auto rawPubX = parsedPubKey->getBstrValue(CoseKey::PUBKEY_X);
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if (!rawPubX) {
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return kStatusInvalidEek;
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}
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auto rawPubY = parsedPubKey->getBstrValue(CoseKey::PUBKEY_Y);
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if (!rawPubY) {
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return kStatusInvalidEek;
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}
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KeyInfoEcdsa matcher = {static_cast<CoseKeyCurve>(*curve),
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byte_view(rawPubX->data(), rawPubX->size()),
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byte_view(rawPubY->data(), rawPubY->size())};
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if (std::find(std::begin(kAuthorizedEcdsa256EekRoots),
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std::end(kAuthorizedEcdsa256EekRoots),
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matcher) == std::end(kAuthorizedEcdsa256EekRoots)) {
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return kStatusInvalidEek;
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}
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}
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}
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auto eek = parseEcdh256(lastPubKey);
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if (!eek) {
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return kStatusInvalidEek;
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}
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return std::make_tuple(eek->getBstrValue(CoseKey::PUBKEY_X).value(),
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eek->getBstrValue(CoseKey::PUBKEY_Y).value(),
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eek->getBstrValue(CoseKey::KEY_ID).value());
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}
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TEST(RemoteProvUtilsTest, GenerateEekChainInvalidLength) {
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ASSERT_FALSE(generateEekChain(RpcHardwareInfo::CURVE_25519, 1, /*eekId=*/{}));
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}
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TEST(RemoteProvUtilsTest, GenerateEekChain) {
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bytevec kTestEekId = {'t', 'e', 's', 't', 'I', 'd', 0};
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for (size_t length : {2, 3, 31}) {
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auto get_eek_result = generateEekChain(RpcHardwareInfo::CURVE_25519, length, kTestEekId);
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ASSERT_TRUE(get_eek_result) << get_eek_result.message();
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auto& [chain, pubkey, privkey] = *get_eek_result;
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auto validation_result = validateAndExtractEekPubAndId(
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/*testMode=*/true, KeymasterBlob(chain.data(), chain.size()));
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ASSERT_TRUE(validation_result.isOk());
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auto& [eekPub, eekId] = *validation_result;
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EXPECT_THAT(eekId, ElementsAreArray(kTestEekId));
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EXPECT_THAT(eekPub, ElementsAreArray(pubkey));
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}
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}
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TEST(RemoteProvUtilsTest, GetProdEekChain) {
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auto chain = getProdEekChain(RpcHardwareInfo::CURVE_25519);
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auto validation_result = validateAndExtractEekPubAndId(
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/*testMode=*/false, KeymasterBlob(chain.data(), chain.size()));
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ASSERT_TRUE(validation_result.isOk()) << "Error: " << validation_result.moveError();
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auto& [eekPub, eekId] = *validation_result;
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auto [geekCert, ignoredNewPos, error] =
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cppbor::parse(kCoseEncodedGeekCert, sizeof(kCoseEncodedGeekCert));
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ASSERT_NE(geekCert, nullptr) << "Error: " << error;
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ASSERT_NE(geekCert->asArray(), nullptr);
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auto& encodedGeekCoseKey = geekCert->asArray()->get(kCoseSign1Payload);
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ASSERT_NE(encodedGeekCoseKey, nullptr);
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ASSERT_NE(encodedGeekCoseKey->asBstr(), nullptr);
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auto geek = CoseKey::parse(encodedGeekCoseKey->asBstr()->value());
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ASSERT_TRUE(geek) << "Error: " << geek.message();
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const std::vector<uint8_t> empty;
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EXPECT_THAT(eekId, ElementsAreArray(geek->getBstrValue(CoseKey::KEY_ID).value_or(empty)));
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EXPECT_THAT(eekPub, ElementsAreArray(geek->getBstrValue(CoseKey::PUBKEY_X).value_or(empty)));
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}
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TEST(RemoteProvUtilsTest, JsonEncodeCsr) {
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cppbor::Array array;
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array.add(1);
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auto [json, error] = jsonEncodeCsrWithBuild(std::string("test"), array);
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ASSERT_TRUE(error.empty()) << error;
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std::string expected = R"({"build_fingerprint":")" +
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::android::base::GetProperty("ro.build.fingerprint", /*default=*/"") +
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R"(","csr":"gQE=","name":"test","serialno":")" +
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::android::base::GetProperty("ro.serialno", /*default=*/"") + R"("})";
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ASSERT_EQ(json, expected);
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}
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TEST(RemoteProvUtilsTest, GenerateEcdsaEekChainInvalidLength) {
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ASSERT_FALSE(generateEekChain(RpcHardwareInfo::CURVE_P256, 1, /*eekId=*/{}));
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}
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TEST(RemoteProvUtilsTest, GenerateEcdsaEekChain) {
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bytevec kTestEekId = {'t', 'e', 's', 't', 'I', 'd', 0};
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for (size_t length : {2, 3, 31}) {
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auto get_eek_result = generateEekChain(RpcHardwareInfo::CURVE_P256, length, kTestEekId);
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ASSERT_TRUE(get_eek_result) << get_eek_result.message();
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auto& [chain, pubkey, privkey] = *get_eek_result;
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auto validation_result = validateAndExtractEcdsa256EekPubAndId(
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/*testMode=*/true, KeymasterBlob(chain.data(), chain.size()));
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ASSERT_TRUE(validation_result.isOk());
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auto& [eekPubX, eekPubY, eekId] = *validation_result;
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bytevec eekPub;
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eekPub.insert(eekPub.begin(), eekPubX.begin(), eekPubX.end());
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eekPub.insert(eekPub.end(), eekPubY.begin(), eekPubY.end());
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EXPECT_THAT(eekId, ElementsAreArray(kTestEekId));
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EXPECT_THAT(eekPub, ElementsAreArray(pubkey));
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}
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}
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TEST(RemoteProvUtilsTest, GetProdEcdsaEekChain) {
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auto chain = getProdEekChain(RpcHardwareInfo::CURVE_P256);
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auto validation_result = validateAndExtractEcdsa256EekPubAndId(
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/*testMode=*/false, KeymasterBlob(chain.data(), chain.size()));
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ASSERT_TRUE(validation_result.isOk()) << "Error: " << validation_result.moveError();
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auto& [eekPubX, eekPubY, eekId] = *validation_result;
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auto [geekCert, ignoredNewPos, error] =
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cppbor::parse(kCoseEncodedEcdsa256GeekCert, sizeof(kCoseEncodedEcdsa256GeekCert));
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ASSERT_NE(geekCert, nullptr) << "Error: " << error;
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ASSERT_NE(geekCert->asArray(), nullptr);
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auto& encodedGeekCoseKey = geekCert->asArray()->get(kCoseSign1Payload);
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ASSERT_NE(encodedGeekCoseKey, nullptr);
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ASSERT_NE(encodedGeekCoseKey->asBstr(), nullptr);
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auto geek = CoseKey::parse(encodedGeekCoseKey->asBstr()->value());
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ASSERT_TRUE(geek) << "Error: " << geek.message();
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const std::vector<uint8_t> empty;
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EXPECT_THAT(eekId, ElementsAreArray(geek->getBstrValue(CoseKey::KEY_ID).value_or(empty)));
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EXPECT_THAT(eekPubX, ElementsAreArray(geek->getBstrValue(CoseKey::PUBKEY_X).value_or(empty)));
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EXPECT_THAT(eekPubY, ElementsAreArray(geek->getBstrValue(CoseKey::PUBKEY_Y).value_or(empty)));
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}
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} // namespace
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} // namespace aidl::android::hardware::security::keymint::remote_prov
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