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Commit f911bc10 authored by Cody Kesting's avatar Cody Kesting
Browse files

Update Carrier Privileged UIDs on Package Install/Replaced. 

When packages are installed or replaced on the device, they need to be
included in CarrierPrivilegesTracker's cache of installed packages.
Additionally, the privileged UIDs must be reevaluated, as the new
package may match existing certs.

Bug: 147391402
Test: Tested on crosshatch build
Change-Id: I44d6889963506715b63929275c52c8a67e1ac0c2
parent e12e6a29

src/java/com/android/internal/telephony/CarrierPrivilegesTracker.java

+102 −18
Original line number Diff line number Diff line
@@ -32,9 +32,12 @@ import android.content.BroadcastReceiver; 
import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.content.pm.PackageInfo;

import android.content.pm.PackageManager;

import android.content.pm.PackageManager.NameNotFoundException;

import android.content.pm.Signature;

import android.content.pm.UserInfo;

import android.net.Uri;

import android.os.Bundle;

import android.os.Handler;

import android.os.Looper;
@@ -46,11 +49,15 @@ import android.os.UserManager; 
import android.telephony.CarrierConfigManager;

import android.telephony.SubscriptionManager;

import android.telephony.TelephonyManager;

import android.telephony.UiccAccessRule;

import android.text.TextUtils;

import android.util.ArrayMap;

import android.util.ArraySet;

import android.util.IntArray;

import android.util.Log;



import com.android.internal.telephony.uicc.IccUtils;



import java.util.Arrays;

import java.util.List;

import java.util.Map;
@@ -64,6 +71,9 @@ import java.util.Set; 
public class CarrierPrivilegesTracker extends Handler {

    private static final String TAG = CarrierPrivilegesTracker.class.getSimpleName();



    private static final String SHA_1 = "SHA-1";

    private static final String SHA_256 = "SHA-256";



    /**

     * Action to register a Registrant with this Tracker.

     * obj: Registrant that will be notified of Carrier Privileged UID changes.
@@ -90,6 +100,12 @@ public class CarrierPrivilegesTracker extends Handler { 
     */

    private static final int ACTION_SIM_STATE_UPDATED = 4;



    /**

     * Action for tracking when a package is installed or replaced on the device.

     * obj: String package name that was installed or replaced on the device.

     */

    private static final int ACTION_PACKAGE_ADDED_OR_REPLACED = 5;



    private final Context mContext;

    private final Phone mPhone;

    private final CarrierConfigManager mCarrierConfigManager;
@@ -104,6 +120,9 @@ public class CarrierPrivilegesTracker extends Handler { 


    // Map of PackageName -> Certificate hashes for that Package

    private final Map<String, Set<String>> mInstalledPackageCerts;



    // Map of PackageName -> UIDs for that Package

    private final Map<String, Set<Integer>> mCachedUids;

    private int[] mPrivilegedUids;



    private final BroadcastReceiver mIntentReceiver =
@@ -141,6 +160,18 @@ public class CarrierPrivilegesTracker extends Handler { 
                            sendMessage(obtainMessage(ACTION_SIM_STATE_UPDATED, slotId, simState));

                            break;

                        }

                        case Intent.ACTION_PACKAGE_ADDED: // fall through

                        case Intent.ACTION_PACKAGE_REPLACED: {

                            Uri uri = intent.getData();

                            String pkgName = (uri != null) ? uri.getSchemeSpecificPart() : null;

                            if (TextUtils.isEmpty(pkgName)) {

                                Log.e(TAG, "Failed to get package from Intent");

                                return;

                            }



                            sendMessage(obtainMessage(ACTION_PACKAGE_ADDED_OR_REPLACED, pkgName));

                            break;

                        }

                    }

                }

            };
@@ -159,12 +190,15 @@ public class CarrierPrivilegesTracker extends Handler { 
        filter.addAction(CarrierConfigManager.ACTION_CARRIER_CONFIG_CHANGED);

        filter.addAction(TelephonyManager.ACTION_SIM_CARD_STATE_CHANGED);

        filter.addAction(TelephonyManager.ACTION_SIM_APPLICATION_STATE_CHANGED);

        filter.addAction(Intent.ACTION_PACKAGE_ADDED);

        filter.addAction(Intent.ACTION_PACKAGE_REPLACED);

        mContext.registerReceiver(mIntentReceiver, filter);



        mRegistrantList = new RegistrantList();

        mCarrierConfigCerts = new ArraySet<>();

        mUiccCerts = new ArraySet<>();

        mInstalledPackageCerts = new ArrayMap<>();

        mCachedUids = new ArrayMap<>();

        mPrivilegedUids = new int[0];

    }
@@ -187,6 +221,11 @@ public class CarrierPrivilegesTracker extends Handler { 
                handleSimStateChanged(msg.arg1, msg.arg2);

                break;

            }

            case ACTION_PACKAGE_ADDED_OR_REPLACED: {

                String pkgName = (String) msg.obj;

                handlePackageAddedOrReplaced(pkgName);

                break;

            }

            default: {

                Log.e(TAG, "Received unknown msg type: " + msg.what);

                break;
@@ -248,12 +287,48 @@ public class CarrierPrivilegesTracker extends Handler { 
        maybeUpdateCertsAndNotifyRegistrants(mUiccCerts, updatedUiccCerts);

    }



    private void handlePackageAddedOrReplaced(String pkgName) {

        PackageInfo pkg;

        try {

            pkg = mPackageManager.getPackageInfo(pkgName, PackageManager.GET_SIGNING_CERTIFICATES);

        } catch (NameNotFoundException e) {

            Log.e(TAG, "Error getting installed package: " + pkgName, e);

            return;

        }



        Set<String> certs = new ArraySet<>();

        List<Signature> signatures = UiccAccessRule.getSignatures(pkg);

        for (Signature signature : signatures) {

            byte[] sha1 = UiccAccessRule.getCertHash(signature, SHA_1);

            certs.add(IccUtils.bytesToHexString(sha1).toUpperCase());



            byte[] sha256 = UiccAccessRule.getCertHash(signature, SHA_256);

            certs.add(IccUtils.bytesToHexString(sha256).toUpperCase());

        }



        mInstalledPackageCerts.put(pkg.packageName, certs);



        try {

            mCachedUids.put(pkg.packageName, getUidsForPackage(pkg.packageName));

        } catch (NameNotFoundException exception) {

            // Didn't find package. Continue looking at other packages

            Log.e(TAG, "Unable to find uid for package: " + pkg.packageName);

        }



        maybeUpdatePrivilegedUidsAndNotifyRegistrants();

    }



    private void maybeUpdateCertsAndNotifyRegistrants(

            Set<String> currentCerts, Set<String> updatedCerts) {

        if (!currentCerts.equals(updatedCerts)) {

            currentCerts.clear();

            currentCerts.addAll(updatedCerts);



            maybeUpdatePrivilegedUidsAndNotifyRegistrants();

        }

    }



    private void maybeUpdatePrivilegedUidsAndNotifyRegistrants() {

        int[] currentPrivilegedUids = getCurrentPrivilegedUids();



        // Sort UIDs for the equality check
@@ -263,26 +338,19 @@ public class CarrierPrivilegesTracker extends Handler { 
            mRegistrantList.notifyResult(mPrivilegedUids);

        }

    }

    }



    private int[] getCurrentPrivilegedUids() {

        Set<Integer> privilegedUids = new ArraySet<>();

        for (Map.Entry<String, Set<String>> e : mInstalledPackageCerts.entrySet()) {

            if (isPackagePrivileged(e.getValue())) {

                List<UserInfo> users = mUserManager.getUsers();

                for (UserInfo user : users) {

                try {

                        int uid =

                                mPackageManager.getPackageUidAsUser(

                                        e.getKey(), user.getUserHandle().getIdentifier());

                        privilegedUids.add(uid);

                    privilegedUids.addAll(getUidsForPackage(e.getKey()));

                } catch (NameNotFoundException exception) {

                    // Didn't find package. Continue looking at other packages

                    Log.e(TAG, "Unable to find uid for package: " + e.getKey());

                }

            }

        }

        }



        IntArray result = new IntArray(privilegedUids.size());

        for (int uid : privilegedUids) {
@@ -300,6 +368,22 @@ public class CarrierPrivilegesTracker extends Handler { 
        return false;

    }



    private Set<Integer> getUidsForPackage(String pkgName) throws NameNotFoundException {

        if (mCachedUids.containsKey(pkgName)) {

            return mCachedUids.get(pkgName);

        }



        Set<Integer> uids = new ArraySet<>();

        List<UserInfo> users = mUserManager.getUsers();

        for (UserInfo user : users) {

            uids.add(

                    mPackageManager.getPackageUidAsUser(

                            pkgName, user.getUserHandle().getIdentifier()));

        }

        mCachedUids.put(pkgName, uids);

        return uids;

    }



    /**

     * Registers the given Registrant with this tracker.

     *