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Commit 62d6a35d authored by Treehugger Robot's avatar Treehugger Robot Committed by Gerrit Code Review
Browse files

Merge "KM 4 tests for Root-of-Trust"

parents 3551f296 06843cb6

keymaster/4.0/vts/functional/Android.bp

+5 −0
Original line number Diff line number Diff line
@@ -30,13 +30,17 @@ cc_test { 
        "keymaster_hidl_hal_test.cpp",

    ],

    srcs: [

        "BootloaderStateTest.cpp",

        "HmacKeySharingTest.cpp",

        "VerificationTokenTest.cpp",

        "keymaster_hidl_hal_test.cpp",

    ],

    static_libs: [

        "android.hardware.keymaster@4.0",

        "libavb_user",

        "libavb",

        "libcrypto_static",

        "libfs_mgr",

        "libkeymaster4support",

        "libkeymaster4vtstest",

    ],
@@ -64,6 +68,7 @@ cc_test_library { 
    ],

    static_libs: [

        "android.hardware.keymaster@4.0",

        "libcrypto_static",

        "libkeymaster4support",

    ],

}

keymaster/4.0/vts/functional/BootloaderStateTest.cpp

0 → 100644
+146 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2023 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 <memory>

#include <optional>

#include <string>

#include <vector>



#include <android-base/properties.h>

#include <fstab/fstab.h>

#include <libavb/libavb.h>

#include <libavb_user/avb_ops_user.h>



#include "KeymasterHidlTest.h"



namespace android::hardware::keymaster::V4_0::test {



using ::std::string;

using ::std::vector;



// Since this test needs to talk to Keymaster HAL, it can only run as root. Thus,

// bootloader can not be locked.

class BootloaderStateTest : public KeymasterHidlTest {

  public:

    virtual void SetUp() override {

        KeymasterHidlTest::SetUp();



        // Generate a key.

        auto ec = GenerateKey(AuthorizationSetBuilder()

                                      .Authorization(TAG_NO_AUTH_REQUIRED)

                                      .EcdsaSigningKey(EcCurve::P_256)

                                      .Digest(Digest::SHA_2_256));

        ASSERT_EQ(ec, ErrorCode::OK) << "Failed to generate key.";



        // Generate attestation.

        hidl_vec<hidl_vec<uint8_t>> cert_chain;

        ec = AttestKey(AuthorizationSetBuilder()

                               .Authorization(TAG_ATTESTATION_CHALLENGE, HidlBuf("challenge"))

                               .Authorization(TAG_ATTESTATION_APPLICATION_ID, HidlBuf("foo")),

                       &cert_chain);

        ASSERT_EQ(ec, ErrorCode::OK) << "Failed to generate attestation.";



        X509_Ptr cert(parse_cert_blob(cert_chain[0]));

        ASSERT_TRUE(cert.get()) << "Failed to parse certificate blob.";



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

        ASSERT_TRUE(attest_rec) << "Failed to get attestation record.";



        // Parse root of trust.

        HidlBuf verified_boot_key;

        keymaster_verified_boot_t verified_boot_state;

        bool device_locked;

        HidlBuf verified_boot_hash;

        auto result =

                parse_root_of_trust(attest_rec->data, attest_rec->length, &verified_boot_key,

                                    &verified_boot_state, &device_locked, &verified_boot_hash);

        ASSERT_EQ(result, ErrorCode::OK) << "Failed to parse root of trust.";

    }



    hidl_vec<uint8_t> attestedVbKey_;

    keymaster_verified_boot_t attestedVbState_;

    bool attestedBootloaderState_;

    hidl_vec<uint8_t> attestedVbmetaDigest_;

};



// Check that attested bootloader state is set to unlocked.

TEST_P(BootloaderStateTest, BootloaderIsUnlocked) {

    ASSERT_FALSE(attestedBootloaderState_)

            << "This test runs as root. Bootloader must be unlocked.";

}



// Check that verified boot state is set to "unverified", i.e. "orange".

TEST_P(BootloaderStateTest, VbStateIsUnverified) {

    // Unlocked bootloader implies that verified boot state must be "unverified".

    ASSERT_EQ(attestedVbState_, KM_VERIFIED_BOOT_UNVERIFIED)

            << "Verified boot state must be \"UNVERIFIED\" aka \"orange\".";



    // AVB spec stipulates that bootloader must set "androidboot.verifiedbootstate" parameter

    // on the kernel command-line. This parameter is exposed to userspace as

    // "ro.boot.verifiedbootstate" property.

    auto vbStateProp = ::android::base::GetProperty("ro.boot.verifiedbootstate", "");

    ASSERT_EQ(vbStateProp, "orange")

            << "Verified boot state must be \"UNVERIFIED\" aka \"orange\".";

}



// Following error codes from avb_slot_data() mean that slot data was loaded

// (even if verification failed).

static inline bool avb_slot_data_loaded(AvbSlotVerifyResult result) {

    switch (result) {

        case AVB_SLOT_VERIFY_RESULT_OK:

        case AVB_SLOT_VERIFY_RESULT_ERROR_VERIFICATION:

        case AVB_SLOT_VERIFY_RESULT_ERROR_ROLLBACK_INDEX:

        case AVB_SLOT_VERIFY_RESULT_ERROR_PUBLIC_KEY_REJECTED:

            return true;

        default:

            return false;

    }

}



// Check that attested vbmeta digest is correct.

TEST_P(BootloaderStateTest, VbmetaDigest) {

    AvbSlotVerifyData* avbSlotData;

    auto suffix = fs_mgr_get_slot_suffix();

    const char* partitions[] = {nullptr};

    auto avbOps = avb_ops_user_new();



    // For VTS, devices run with vendor_boot-debug.img, which is not release key

    // signed. Use AVB_SLOT_VERIFY_FLAGS_ALLOW_VERIFICATION_ERROR to bypass avb

    // verification errors. This is OK since we only care about the digest for

    // this test case.

    auto result = avb_slot_verify(avbOps, partitions, suffix.c_str(),

                                  AVB_SLOT_VERIFY_FLAGS_ALLOW_VERIFICATION_ERROR,

                                  AVB_HASHTREE_ERROR_MODE_EIO, &avbSlotData);

    ASSERT_TRUE(avb_slot_data_loaded(result)) << "Failed to load avb slot data";



    // Unfortunately, bootloader is not required to report the algorithm used

    // to calculate the digest. There are only two supported options though,

    // SHA256 and SHA512. Attested VBMeta digest must match one of these.

    vector<uint8_t> digest256(AVB_SHA256_DIGEST_SIZE);

    vector<uint8_t> digest512(AVB_SHA512_DIGEST_SIZE);



    avb_slot_verify_data_calculate_vbmeta_digest(avbSlotData, AVB_DIGEST_TYPE_SHA256,

                                                 digest256.data());

    avb_slot_verify_data_calculate_vbmeta_digest(avbSlotData, AVB_DIGEST_TYPE_SHA512,

                                                 digest512.data());



    ASSERT_TRUE((attestedVbmetaDigest_ == digest256) || (attestedVbmetaDigest_ == digest512))

            << "Attested digest does not match computed digest.";

}



INSTANTIATE_KEYMASTER_HIDL_TEST(BootloaderStateTest);



}  // namespace android::hardware::keymaster::V4_0::test

keymaster/4.0/vts/functional/KeymasterHidlTest.cpp

+24 −0
Original line number Diff line number Diff line
@@ -841,6 +841,30 @@ std::vector<Digest> KeymasterHidlTest::InvalidDigests() { 
    return {};

}



X509* parse_cert_blob(const hidl_vec<uint8_t>& blob) {

    const uint8_t* p = blob.data();

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

}



ASN1_OCTET_STRING* get_attestation_record(X509* certificate) {

    ASN1_OBJECT_Ptr oid(OBJ_txt2obj(kAttestionRecordOid, 1 /* dotted string format */));

    EXPECT_TRUE(!!oid.get());

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



    int location = X509_get_ext_by_OBJ(certificate, oid.get(), -1 /* search from beginning */);

    EXPECT_NE(-1, location) << "Attestation extension not found in certificate";

    if (location == -1) return nullptr;



    X509_EXTENSION* attest_rec_ext = X509_get_ext(certificate, location);

    EXPECT_TRUE(!!attest_rec_ext)

            << "Found attestation extension but couldn't retrieve it?  Probably a BoringSSL bug.";

    if (!attest_rec_ext) return nullptr;



    ASN1_OCTET_STRING* attest_rec = X509_EXTENSION_get_data(attest_rec_ext);

    EXPECT_TRUE(!!attest_rec) << "Attestation extension contained no data";

    return attest_rec;

}



}  // namespace test

}  // namespace V4_0

}  // namespace keymaster

keymaster/4.0/vts/functional/KeymasterHidlTest.h

+7 −0
Original line number Diff line number Diff line
@@ -22,7 +22,9 @@ 
#include <hidl/GtestPrinter.h>

#include <hidl/ServiceManagement.h>



#include <keymasterV4_0/attestation_record.h>

#include <keymasterV4_0/authorization_set.h>

#include <keymasterV4_0/openssl_utils.h>



namespace android {

namespace hardware {
@@ -241,6 +243,11 @@ class KeymasterHidlTest : public ::testing::TestWithParam<std::string> { 
                             testing::ValuesIn(KeymasterHidlTest::build_params()), \

                             android::hardware::PrintInstanceNameToString)



X509* parse_cert_blob(const hidl_vec<uint8_t>& blob);

// Extract attestation record from cert. Returned object is still part of cert; don't free it

// separately.

ASN1_OCTET_STRING* get_attestation_record(X509* certificate);



}  // namespace test

}  // namespace V4_0

}  // namespace keymaster

keymaster/4.0/vts/functional/keymaster_hidl_hal_test.cpp

+0 −26
Original line number Diff line number Diff line
@@ -263,11 +263,6 @@ struct RSA_Delete { 
    void operator()(RSA* p) { RSA_free(p); }

};



X509* parse_cert_blob(const hidl_vec<uint8_t>& blob) {

    const uint8_t* p = blob.data();

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

}



bool verify_chain(const hidl_vec<hidl_vec<uint8_t>>& chain, const std::string& msg,

                  const std::string& signature) {

    {
@@ -337,27 +332,6 @@ bool verify_chain(const hidl_vec<hidl_vec<uint8_t>>& chain, const std::string& m 
    return true;

}



// Extract attestation record from cert. Returned object is still part of cert; don't free it

// separately.

ASN1_OCTET_STRING* get_attestation_record(X509* certificate) {

    ASN1_OBJECT_Ptr oid(OBJ_txt2obj(kAttestionRecordOid, 1 /* dotted string format */));

    EXPECT_TRUE(!!oid.get());

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



    int location = X509_get_ext_by_OBJ(certificate, oid.get(), -1 /* search from beginning */);

    EXPECT_NE(-1, location) << "Attestation extension not found in certificate";

    if (location == -1) return nullptr;



    X509_EXTENSION* attest_rec_ext = X509_get_ext(certificate, location);

    EXPECT_TRUE(!!attest_rec_ext)

        << "Found attestation extension but couldn't retrieve it?  Probably a BoringSSL bug.";

    if (!attest_rec_ext) return nullptr;



    ASN1_OCTET_STRING* attest_rec = X509_EXTENSION_get_data(attest_rec_ext);

    EXPECT_TRUE(!!attest_rec) << "Attestation extension contained no data";

    return attest_rec;

}



bool tag_in_list(const KeyParameter& entry) {

    // Attestations don't contain everything in key authorization lists, so we need to filter

    // the key lists to produce the lists that we expect to match the attestations.