Merge "Resolve IndexOOBException in SigningDetails#hasAncestor" into rvc-dev

                // the last entry in pastSigningCertificates is the current signer, ignore it

                // the last entry in pastSigningCertificates is the current signer, ignore it

                for (int i = 0; i < pastSigningCertificates.length - 1; i++) {

                for (int i = 0; i < pastSigningCertificates.length - 1; i++) {

                    if (pastSigningCertificates[i].equals(oldDetails.signatures[i])) {

                    if (pastSigningCertificates[i].equals(oldDetails.signatures[0])) {

                        return true;

                        return true;

                    }

                    }

                }

                }

/*

 * Copyright (C) 2020 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.

 */

package android.content.pm;

import static android.content.pm.PackageParser.SigningDetails.SignatureSchemeVersion.SIGNING_BLOCK_V3;

import static org.junit.Assert.assertFalse;

import static org.junit.Assert.assertTrue;

import android.content.pm.PackageParser.SigningDetails;

import android.util.ArraySet;

import androidx.test.ext.junit.runners.AndroidJUnit4;

import androidx.test.filters.SmallTest;

import org.junit.Test;

import org.junit.runner.RunWith;

import java.security.PublicKey;

@RunWith(AndroidJUnit4.class)

@SmallTest

public class SigningDetailsTest {

    private static final String FIRST_SIGNATURE = "1234";

    private static final String SECOND_SIGNATURE = "5678";

    private static final String THIRD_SIGNATURE = "9abc";

    @Test

    public void hasAncestor_multipleSignersInLineageWithAncestor_returnsTrue() throws Exception {

        SigningDetails twoSignersInLineageDetails = createSigningDetailsWithLineage(FIRST_SIGNATURE,

                SECOND_SIGNATURE, THIRD_SIGNATURE);

        SigningDetails oneSignerInLineageDetails = createSigningDetailsWithLineage(FIRST_SIGNATURE,

                SECOND_SIGNATURE);

        boolean result = twoSignersInLineageDetails.hasAncestor(oneSignerInLineageDetails);

        assertTrue(result);

    }

    @Test

    public void hasAncestor_oneSignerInLineageAgainstMultipleSignersInLineage_returnsFalse()

            throws Exception {

        SigningDetails twoSignersInLineageDetails = createSigningDetailsWithLineage(FIRST_SIGNATURE,

                SECOND_SIGNATURE, THIRD_SIGNATURE);

        SigningDetails oneSignerInLineageDetails = createSigningDetailsWithLineage(FIRST_SIGNATURE,

                SECOND_SIGNATURE);

        boolean result = oneSignerInLineageDetails.hasAncestor(twoSignersInLineageDetails);

        assertFalse(result);

    }

    @Test

    public void hasAncestor_multipleSignersInLineageAgainstSelf_returnsFalse() throws Exception {

        SigningDetails twoSignersInLineageDetails = createSigningDetailsWithLineage(FIRST_SIGNATURE,

                SECOND_SIGNATURE, THIRD_SIGNATURE);

        boolean result = twoSignersInLineageDetails.hasAncestor(twoSignersInLineageDetails);

        assertFalse(result);

    }

    @Test

    public void hasAncestor_oneSignerInLineageWithAncestor_returnsTrue() throws Exception {

        SigningDetails twoSignersInLineageDetails = createSigningDetailsWithLineage(FIRST_SIGNATURE,

                SECOND_SIGNATURE, THIRD_SIGNATURE);

        SigningDetails oneSignerDetails = createSigningDetails(FIRST_SIGNATURE);

        boolean result = twoSignersInLineageDetails.hasAncestor(oneSignerDetails);

        assertTrue(result);

    }

    @Test

    public void hasAncestor_singleSignerAgainstLineage_returnsFalse() throws Exception {

        SigningDetails oneSignerDetails = createSigningDetails(FIRST_SIGNATURE);

        SigningDetails twoSignersInLineageDetails = createSigningDetailsWithLineage(FIRST_SIGNATURE,

                SECOND_SIGNATURE, THIRD_SIGNATURE);

        boolean result = oneSignerDetails.hasAncestor(twoSignersInLineageDetails);

        assertFalse(result);

    }

    @Test

    public void hasAncestor_multipleSigners_returnsFalse() throws Exception {

        SigningDetails twoSignersDetails = createSigningDetails(FIRST_SIGNATURE, SECOND_SIGNATURE);

        SigningDetails twoSignersInLineageDetails = createSigningDetailsWithLineage(FIRST_SIGNATURE,

                SECOND_SIGNATURE, THIRD_SIGNATURE);

        boolean result1 = twoSignersInLineageDetails.hasAncestor(twoSignersDetails);

        boolean result2 = twoSignersDetails.hasAncestor(twoSignersInLineageDetails);

        assertFalse(result1);

        assertFalse(result2);

    }

    @Test

    public void hasAncestor_unknownDetails_returnsFalse() throws Exception {

        SigningDetails unknownDetails = SigningDetails.UNKNOWN;

        SigningDetails twoSignersInLineageDetails = createSigningDetailsWithLineage(FIRST_SIGNATURE,

                SECOND_SIGNATURE, THIRD_SIGNATURE);

        boolean result1 = twoSignersInLineageDetails.hasAncestor(unknownDetails);

        boolean result2 = unknownDetails.hasAncestor(twoSignersInLineageDetails);

        assertFalse(result1);

        assertFalse(result2);

    }

    private SigningDetails createSigningDetailsWithLineage(String... signers) {

        Signature[] signingHistory = new Signature[signers.length];

        for (int i = 0; i < signers.length; i++) {

            signingHistory[i] = new Signature(signers[i]);

        }

        Signature[] currentSignature = new Signature[]{signingHistory[signers.length - 1]};

        // TODO: Since the PublicKey ArraySet is not used by any of the tests a generic empty Set

        // works for now, but if this is needed in the future consider creating mock PublicKeys that

        // can respond as required for the method under test.

        ArraySet<PublicKey> publicKeys = new ArraySet<>();

        return new SigningDetails(currentSignature, SIGNING_BLOCK_V3, publicKeys, signingHistory);

    }

    private SigningDetails createSigningDetails(String... signers) {

        Signature[] currentSignatures = new Signature[signers.length];

        for (int i = 0; i < signers.length; i++) {

            currentSignatures[i] = new Signature(signers[i]);

        }

        // TODO: Similar to above when tests are added that require this it should be updated to use

        // mocked PublicKeys.

        ArraySet<PublicKey> publicKeys = new ArraySet<>();

        return new SigningDetails(currentSignatures, SIGNING_BLOCK_V3, publicKeys, null);

    }

}