/*
 * Copyright (C) 2017 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 com.android.cts.delegate;

import static android.app.admin.DevicePolicyManager.DELEGATION_CERT_INSTALL;
import static com.android.cts.delegate.DelegateTestUtils.assertExpectException;

import android.app.admin.DevicePolicyManager;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.os.Parcelable;
import android.os.UserManager;
import android.test.InstrumentationTestCase;
import android.test.MoreAsserts;
import android.util.Base64;
import android.util.Base64InputStream;
import android.util.Log;

import java.io.ByteArrayInputStream;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.KeyFactory;
import java.security.PrivateKey;
import java.util.List;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;

/**
 * Tests that a package other than the DPC can manage app restrictions if allowed by the DPC
 * via {@link DevicePolicyManager#setApplicationRestrictionsManagingPackage(ComponentName, String)}
 */
public class CertInstallDelegateTest extends InstrumentationTestCase {

    private static final String TEST_CA =
            "-----BEGIN CERTIFICATE-----\n" +
            "MIIDXTCCAkWgAwIBAgIJAK9Tl/F9V8kSMA0GCSqGSIb3DQEBCwUAMEUxCzAJBgNV\n" +
            "BAYTAkFVMRMwEQYDVQQIDApTb21lLVN0YXRlMSEwHwYDVQQKDBhJbnRlcm5ldCBX\n" +
            "aWRnaXRzIFB0eSBMdGQwHhcNMTUwMzA2MTczMjExWhcNMjUwMzAzMTczMjExWjBF\n" +
            "MQswCQYDVQQGEwJBVTETMBEGA1UECAwKU29tZS1TdGF0ZTEhMB8GA1UECgwYSW50\n" +
            "ZXJuZXQgV2lkZ2l0cyBQdHkgTHRkMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIB\n" +
            "CgKCAQEAvItOutsE75WBTgTyNAHt4JXQ3JoseaGqcC3WQij6vhrleWi5KJ0jh1/M\n" +
            "Rpry7Fajtwwb4t8VZa0NuM2h2YALv52w1xivql88zce/HU1y7XzbXhxis9o6SCI+\n" +
            "oVQSbPeXRgBPppFzBEh3ZqYTVhAqw451XhwdA4Aqs3wts7ddjwlUzyMdU44osCUg\n" +
            "kVg7lfPf9sTm5IoHVcfLSCWH5n6Nr9sH3o2ksyTwxuOAvsN11F/a0mmUoPciYPp+\n" +
            "q7DzQzdi7akRG601DZ4YVOwo6UITGvDyuAAdxl5isovUXqe6Jmz2/myTSpAKxGFs\n" +
            "jk9oRoG6WXWB1kni490GIPjJ1OceyQIDAQABo1AwTjAdBgNVHQ4EFgQUH1QIlPKL\n" +
            "p2OQ/AoLOjKvBW4zK3AwHwYDVR0jBBgwFoAUH1QIlPKLp2OQ/AoLOjKvBW4zK3Aw\n" +
            "DAYDVR0TBAUwAwEB/zANBgkqhkiG9w0BAQsFAAOCAQEAcMi4voMMJHeQLjtq8Oky\n" +
            "Azpyk8moDwgCd4llcGj7izOkIIFqq/lyqKdtykVKUWz2bSHO5cLrtaOCiBWVlaCV\n" +
            "DYAnnVLM8aqaA6hJDIfaGs4zmwz0dY8hVMFCuCBiLWuPfiYtbEmjHGSmpQTG6Qxn\n" +
            "ZJlaK5CZyt5pgh5EdNdvQmDEbKGmu0wpCq9qjZImwdyAul1t/B0DrsWApZMgZpeI\n" +
            "d2od0VBrCICB1K4p+C51D93xyQiva7xQcCne+TAnGNy9+gjQ/MyR8MRpwRLv5ikD\n" +
            "u0anJCN8pXo6IMglfMAsoton1J6o5/ae5uhC6caQU8bNUsCK570gpNfjkzo6rbP0\n" +
            "wQ==\n" +
            "-----END CERTIFICATE-----";

    // Content from userkey.pem without the private key header and footer.
    private static final String TEST_KEY =
            "MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBALCYprGsTU+5L3KM\n" +
            "fhkm0gXM2xjGUH+543YLiMPGVr3eVS7biue1/tQlL+fJsw3rqsPKJe71RbVWlpqU\n" +
            "mhegxG4s3IvGYVB0KZoRIjDKmnnvlx6nngL2ZJ8O27U42pHsw4z4MKlcQlWkjL3T\n" +
            "9sV6zW2Wzri+f5mvzKjhnArbLktHAgMBAAECgYBlfVVPhtZnmuXJzzQpAEZzTugb\n" +
            "tN1OimZO0RIocTQoqj4KT+HkiJOLGFQPwbtFpMre+q4SRqNpM/oZnI1yRtKcCmIc\n" +
            "mZgkwJ2k6pdSxqO0ofxFFTdT9czJ3rCnqBHy1g6BqUQFXT4olcygkxUpKYUwzlz1\n" +
            "oAl487CoPxyr4sVEAQJBANwiUOHcdGd2RoRILDzw5WOXWBoWPOKzX/K9wt0yL+mO\n" +
            "wlFNFSymqo9eLheHcEq/VD9qK9rT700dCewJfWj6+bECQQDNXmWNYIxGii5NJilT\n" +
            "OBOHiMD/F0NE178j+/kmacbhDJwpkbLYXaP8rW4+Iswrm4ORJ59lvjNuXaZ28+sx\n" +
            "fFp3AkA6Z7Bl/IO135+eATgbgx6ZadIqObQ1wbm3Qbmtzl7/7KyJvZXcnuup1icM\n" +
            "fxa//jtwB89S4+Ad6ZJ0WaA4dj5BAkEAuG7V9KmIULE388EZy8rIfyepa22Q0/qN\n" +
            "hdt8XasRGHsio5Jdc0JlSz7ViqflhCQde/aBh/XQaoVgQeO8jKyI8QJBAJHekZDj\n" +
            "WA0w1RsBVVReN1dVXgjm1CykeAT8Qx8TUmBUfiDX6w6+eGQjKtS7f4KC2IdRTV6+\n" +
            "bDzDoHBChHNC9ms=\n";

    // Content from usercert.pem without the header and footer.
    private static final String TEST_CERT =
            "MIIDEjCCAfqgAwIBAgIBATANBgkqhkiG9w0BAQsFADBFMQswCQYDVQQGEwJBVTET\n" +
            "MBEGA1UECAwKU29tZS1TdGF0ZTEhMB8GA1UECgwYSW50ZXJuZXQgV2lkZ2l0cyBQ\n" +
            "dHkgTHRkMB4XDTE1MDUwMTE2NTQwNVoXDTI1MDQyODE2NTQwNVowWzELMAkGA1UE\n" +
            "BhMCQVUxEzARBgNVBAgMClNvbWUtU3RhdGUxITAfBgNVBAoMGEludGVybmV0IFdp\n" +
            "ZGdpdHMgUHR5IEx0ZDEUMBIGA1UEAwwLY2xpZW50IGNlcnQwgZ8wDQYJKoZIhvcN\n" +
            "AQEBBQADgY0AMIGJAoGBALCYprGsTU+5L3KMfhkm0gXM2xjGUH+543YLiMPGVr3e\n" +
            "VS7biue1/tQlL+fJsw3rqsPKJe71RbVWlpqUmhegxG4s3IvGYVB0KZoRIjDKmnnv\n" +
            "lx6nngL2ZJ8O27U42pHsw4z4MKlcQlWkjL3T9sV6zW2Wzri+f5mvzKjhnArbLktH\n" +
            "AgMBAAGjezB5MAkGA1UdEwQCMAAwLAYJYIZIAYb4QgENBB8WHU9wZW5TU0wgR2Vu\n" +
            "ZXJhdGVkIENlcnRpZmljYXRlMB0GA1UdDgQWBBQ8GL+jKSarvTn9fVNA2AzjY7qq\n" +
            "gjAfBgNVHSMEGDAWgBRzBBA5sNWyT/fK8GrhN3tOqO5tgjANBgkqhkiG9w0BAQsF\n" +
            "AAOCAQEAgwQEd2bktIDZZi/UOwU1jJUgGq7NiuBDPHcqgzjxhGFLQ8SQAAP3v3PR\n" +
            "mLzcfxsxnzGynqN5iHQT4rYXxxaqrp1iIdj9xl9Wl5FxjZgXITxhlRscOd/UOBvG\n" +
            "oMrazVczjjdoRIFFnjtU3Jf0Mich68HD1Z0S3o7X6sDYh6FTVR5KbLcxbk6RcoG4\n" +
            "VCI5boR5LUXgb5Ed5UxczxvN12S71fyxHYVpuuI0z0HTIbAxKeRw43I6HWOmR1/0\n" +
            "G6byGCNL/1Fz7Y+264fGqABSNTKdZwIU2K4ANEH7F+9scnhoO6OBp+gjBe5O+7jb\n" +
            "wZmUCAoTka4hmoaOCj7cqt/IkmxozQ==\n";

    private DevicePolicyManager mDpm;

    @Override
    protected void setUp() throws Exception {
        super.setUp();

        Context context = getInstrumentation().getContext();
        mDpm = context.getSystemService(DevicePolicyManager.class);
    }

    public void testCannotAccessApis() {
        assertFalse(amICertInstallDelegate());

        assertExpectException(SecurityException.class,
                "Neither user \\d+ nor current process has", () -> {
                    mDpm.installCaCert(null, null);
                });

        assertExpectException(SecurityException.class,
                "Caller with uid \\d+ is not a delegate of scope", () -> {
                    mDpm.removeKeyPair(null, "alias");
                });
    }

    public void testCanAccessApis() throws Exception {
        assertTrue(amICertInstallDelegate());

        byte[] cert = TEST_CA.getBytes();

        // Exercise installCaCert.
        assertTrue("Certificate installation failed", mDpm.installCaCert(null, cert));

        // Exercise hasCertInstalled.
        assertTrue("Certificate is not installed properly", mDpm.hasCaCertInstalled(null, cert));

        // Exercise getInstalledCaCerts.
        assertTrue("Certificate is not among installed certs",
                containsCertificate(mDpm.getInstalledCaCerts(null), cert));

        // Exercise uninstallCaCert.
        mDpm.uninstallCaCert(null, cert);
        assertFalse("Certificate was not uninstalled", mDpm.hasCaCertInstalled(null, cert));

        // Exercise installKeyPair.
        final String alias = "delegated-cert-installer-test-key";

        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(
                Base64.decode(TEST_KEY, Base64.DEFAULT));
        KeyFactory kf = KeyFactory.getInstance("RSA");
        PrivateKey privatekey = kf.generatePrivate(keySpec);

        Certificate certificate = CertificateFactory.getInstance("X.509").generateCertificate(
                new Base64InputStream(new ByteArrayInputStream(TEST_CERT.getBytes()),
                    Base64.DEFAULT));
        assertTrue("Key pair not installed successfully",
                mDpm.installKeyPair(null, privatekey, certificate, alias));

        // Exercise removeKeyPair.
        assertTrue("Key pair not removed successfully", mDpm.removeKeyPair(null, alias));
    }

    private static boolean containsCertificate(List<byte[]> certificates, byte[] toMatch)
            throws CertificateException {
        Certificate certificateToMatch = readCertificate(toMatch);
        for (byte[] certBuffer : certificates) {
            Certificate cert = readCertificate(certBuffer);
            if (certificateToMatch.equals(cert)) {
                return true;
            }
        }
        return false;
    }

    private static Certificate readCertificate(byte[] certBuffer) throws CertificateException {
        final CertificateFactory certFactory = CertificateFactory.getInstance("X.509");
        return certFactory.generateCertificate(new ByteArrayInputStream(certBuffer));
    }

    private boolean amICertInstallDelegate() {
        final String packageName = getInstrumentation().getContext().getPackageName();
        final List<String> scopes = mDpm.getDelegatedScopes(null, packageName);
        return scopes.contains(DELEGATION_CERT_INSTALL);
    }
}