src/com/android/se/SecureElementService.java - platform/packages/apps/SecureElement - Git at Google

 /*
  * 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.
  */
 /*
  * Copyright (c) 2014-2017, The Linux Foundation.
  */
 /*
  * Contributed by: Giesecke & Devrient GmbH.
  */

 package com.android.se;

 import android.app.ActivityManager;
 import android.app.Service;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.pm.PackageManager;
 import android.os.Binder;
 import android.os.Build;
 import android.os.IBinder;
 import android.os.RemoteException;
 import android.os.ServiceManager;
 import android.os.ServiceSpecificException;
 import android.os.UserHandle;
 import android.se.omapi.ISecureElementChannel;
 import android.se.omapi.ISecureElementListener;
 import android.se.omapi.ISecureElementReader;
 import android.se.omapi.ISecureElementService;
 import android.se.omapi.ISecureElementSession;
 import android.se.omapi.SEService;
 import android.telephony.TelephonyManager;
 import android.util.Log;

 import com.android.se.Terminal.SecureElementReader;
 import com.android.se.internal.ByteArrayConverter;
 import com.android.se.security.HalRefDoParser;

 import java.io.FileDescriptor;
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.security.AccessControlException;
 import java.util.ArrayList;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.NoSuchElementException;
 import java.util.Vector;

 /**
  * Underlying implementation for OMAPI SEService
  */
 public final class SecureElementService extends Service {

     public static final String UICC_TERMINAL = "SIM";
     public static final String ESE_TERMINAL = "eSE";
     public static final String VSTABLE_SECURE_ELEMENT_SERVICE =
             "android.se.omapi.ISecureElementService/default";
     private final String mTag = "SecureElementService";
     private static final boolean DEBUG = Build.IS_DEBUGGABLE;
     // LinkedHashMap will maintain the order of insertion
     private LinkedHashMap<String, Terminal> mTerminals = new LinkedHashMap<String, Terminal>();
     private int mActiveSimCount = 0;
     private class SecureElementServiceBinder extends ISecureElementService.Stub {

         @Override
         public String[] getReaders() throws RemoteException {
             try {
                 // This determines calling process is application/framework
                 String packageName = getPackageNameFromCallingUid(Binder.getCallingUid());
                 Log.d(mTag, "getReaders() for " + packageName);
                 return mTerminals.keySet().toArray(new String[mTerminals.size()]);
             } catch (AccessControlException e) {
                 // since packagename not found, UUID might be used to access
                 // allow only to use eSE readers with UUID based requests
                 Vector<String> eSEReaders = new Vector<String>();
                 for (String reader : mTerminals.keySet()) {
                     if (reader.startsWith(SecureElementService.ESE_TERMINAL)) {
                         Log.i(mTag, "Adding Reader: " + reader);
                         eSEReaders.add(reader);
                     }
                 }

                 return eSEReaders.toArray(new String[eSEReaders.size()]);
             }
         }

         @Override
         public ISecureElementReader getReader(String reader) throws RemoteException {
             Log.d(mTag, "getReader() " + reader);
             Terminal terminal = null;
             try {
                 // This determines calling process is application/framework
                 String packageName = getPackageNameFromCallingUid(Binder.getCallingUid());
                 Log.d(mTag, "getReader() for " + packageName);
                 terminal = getTerminal(reader);
             } catch (AccessControlException e) {
                 // since packagename not found, UUID might be used to access
                 // allow only to use eSE readers with UUID based requests
                 if (reader.startsWith(SecureElementService.ESE_TERMINAL)) {
                     terminal = getTerminal(reader);
                 } else {
                     Log.d(mTag, "only eSE readers can access SE using UUID");
                 }
             }
             if (terminal != null) {
                 return terminal.new SecureElementReader(SecureElementService.this);
             } else {
                 throw new IllegalArgumentException("Reader: " + reader + " not supported");
             }
         }

         @Override
         public synchronized boolean[] isNFCEventAllowed(String reader, byte[] aid,
                 String[] packageNames) throws RemoteException {
             if (aid == null || aid.length == 0) {
                 aid = new byte[]{0x00, 0x00, 0x00, 0x00, 0x00};
             }
             if (aid.length < 5 || aid.length > 16) {
                 throw new IllegalArgumentException("AID out of range");
             }
             if (packageNames == null || packageNames.length == 0) {
                 throw new IllegalArgumentException("package names not specified");
             }
             Terminal terminal = getTerminal(reader);
             UserHandle currentUser = new UserHandle(ActivityManager.getCurrentUser());
             return terminal.isNfcEventAllowed(
                     createContextAsUser(currentUser, /*flags=*/0).getPackageManager(),
                     aid, packageNames);
         }

         @Override
         protected void dump(FileDescriptor fd, PrintWriter writer, String[] args) {
             for (Terminal terminal : mTerminals.values()) {
                 terminal.dump(writer);
             }
         }
     }

     private final ISecureElementService.Stub mSecureElementServiceBinder =
             new SecureElementServiceBinder();

     private final ISecureElementService.Stub mSecureElementServiceBinderVntf =
             new SecureElementServiceBinder();

     public SecureElementService() {
         super();
     }

     private void initialize() {
         // listen for events
         IntentFilter intentFilter = new IntentFilter();
         intentFilter.addAction(TelephonyManager.ACTION_MULTI_SIM_CONFIG_CHANGED);
         this.registerReceiver(mMultiSimConfigChangedReceiver, intentFilter);
     }

     /** Returns the terminal from the Reader name. */
     private Terminal getTerminal(String reader) {
         if (reader == null) {
             throw new NullPointerException("reader must not be null");
         }
         if (reader.equals("SIM")) {
             reader = "SIM1";
         }
         Terminal terminal = mTerminals.get(reader);
         if (terminal == null) {
             throw new IllegalArgumentException("Reader: " + reader + " doesn't exist");
         }
         return terminal;
     }

     @Override
     public IBinder onBind(Intent intent) {
         Log.i(mTag, Thread.currentThread().getName() + " onBind");
         if (ISecureElementService.class.getName().equals(intent.getAction())) {
             return mSecureElementServiceBinder;
         }
         return null;
     }

     @Override
     public void onCreate() {
         Log.i(mTag, Thread.currentThread().getName() + " onCreate");
         initialize();
         createTerminals();

         // Add vendor stable service only if it is configured
         if (getResources().getBoolean(R.bool.secure_element_vintf_enabled)) {
             ServiceManager.addService(VSTABLE_SECURE_ELEMENT_SERVICE,
                     mSecureElementServiceBinderVntf);
         }

         // Since ISecureElementService is marked with VINTF stability
         // to use this same interface within the system partition, will use
         // forceDowngradeToSystemStability and register it.
         mSecureElementServiceBinder.forceDowngradeToSystemStability();
         ServiceManager.addService(Context.SECURE_ELEMENT_SERVICE, mSecureElementServiceBinder);
     }

     /**
      * In case the onDestroy is called, we free the memory and
      * close all the channels.
      */
     public void onDestroy() {
         Log.i(mTag, "onDestroy");
         for (Terminal terminal : mTerminals.values()) {
             terminal.closeChannels();
             terminal.close();
         }
         if (mMultiSimConfigChangedReceiver != null) {
             this.unregisterReceiver(mMultiSimConfigChangedReceiver);
         }
     }

     private void addTerminals(String terminalName) {
         int index = 1;
         String name = null;
         if (terminalName.startsWith(SecureElementService.UICC_TERMINAL)) {
             index = mActiveSimCount + 1;
         }
         try {
             do {
                 name = terminalName + Integer.toString(index);
                 Terminal terminal = new Terminal(name, this);

                 Log.i(mTag, "Check if terminal " + name + " is available.");
                 // Only retry on fail for the first terminal of each type.
                 terminal.initialize(index == 1);
                 mTerminals.put(name, terminal);
                 if (terminalName.equals(UICC_TERMINAL)) {
                     mActiveSimCount = index;
                 }
             } while (++index > 0);
         } catch (NoSuchElementException e) {
             Log.i(mTag, "No HAL implementation for " + name);
         } catch (RemoteException | RuntimeException e) {
             Log.e(mTag, "Error in getService() for " + name);
         }
     }

     private void createTerminals() {
         // Check for all SE HAL implementations
         addTerminals(ESE_TERMINAL);
         addTerminals(UICC_TERMINAL);
     }

     private void refreshUiccTerminals(int activeSimCount) {
         String name = null;
         synchronized (this) {
             if (activeSimCount < mActiveSimCount) {
                 // Remove non-supported UICC terminals
                 for (int i = activeSimCount + 1; i <= mActiveSimCount; i++) {
                     name = UICC_TERMINAL + Integer.toString(i);
                     Terminal terminal = mTerminals.get(name);
                     if (terminal != null) {
                         terminal.closeChannels();
                         terminal.close();
                     }
                     mTerminals.remove(name);
                     Log.i(mTag, name + " is removed from available Terminals");
                 }
                 mActiveSimCount = activeSimCount;
             } else if (activeSimCount > mActiveSimCount) {
                 // Try to initialize new UICC terminals
                 addTerminals(UICC_TERMINAL);
             }
         }
     }

     private String getPackageNameFromCallingUid(int uid) {
         PackageManager packageManager = getPackageManager();
         if (packageManager != null) {
             String[] packageName = packageManager.getPackagesForUid(uid);
             if (packageName != null && packageName.length > 0) {
                 return packageName[0];
             }
         }
         throw new AccessControlException("PackageName can not be determined");
     }

     private byte[] getUUIDFromCallingUid(int uid) {
         byte[] uuid = HalRefDoParser.getInstance().findUUID(Binder.getCallingUid());

         if (uuid != null) {
             return uuid;
         }

         return null;
     }

     final class SecureElementSession extends ISecureElementSession.Stub {

         private final SecureElementReader mReader;
         /** List of open channels in use of by this client. */
         private final List<Channel> mChannels = new ArrayList<>();
         private final Object mLock = new Object();
         private boolean mIsClosed;
         private byte[] mAtr;

         SecureElementSession(SecureElementReader reader) {
             if (reader == null) {
                 throw new NullPointerException("SecureElementReader cannot be null");
             }
             mReader = reader;
             mAtr = mReader.getAtr();
             mIsClosed = false;
         }

         public ISecureElementReader getReader() throws RemoteException {
             return mReader;
         }

         @Override
         public byte[] getAtr() throws RemoteException {
             return mAtr;
         }

         @Override
         public void close() throws RemoteException {
             closeChannels();
             mReader.removeSession(this);
             synchronized (mLock) {
                 mIsClosed = true;
             }
         }

         void removeChannel(Channel channel) {
             synchronized (mLock) {
                 if (mChannels != null) {
                     mChannels.remove(channel);
                 }
             }
         }

         @Override
         public void closeChannels() throws RemoteException {
             synchronized (mLock) {
                 while (mChannels.size() > 0) {
                     try {
                         mChannels.get(0).close();
                     } catch (Exception ignore) {
                         Log.e(mTag, "SecureElementSession Channel - close Exception "
                                 + ignore.getMessage());
                     }
                 }
             }
         }

         @Override
         public boolean isClosed() throws RemoteException {
             synchronized (mLock) {
                 return mIsClosed;
             }
         }

         @Override
         public ISecureElementChannel openBasicChannel(byte[] aid, byte p2,
                 ISecureElementListener listener) throws RemoteException {
             if (DEBUG) {
                 Log.i(mTag, "openBasicChannel() AID = "
                         + ByteArrayConverter.byteArrayToHexString(aid) + ", P2 = " + p2);
             }
             if (isClosed()) {
                 throw new IllegalStateException("Session is closed");
             } else if (listener == null) {
                 throw new NullPointerException("listener must not be null");
             } else if ((p2 != 0x00) && (p2 != 0x04) && (p2 != 0x08)
                     && (p2 != (byte) 0x0C)) {
                 throw new UnsupportedOperationException("p2 not supported: "
                         + String.format("%02x ", p2 & 0xFF));
             }

             String packageName = null;
             byte[] uuid = null;
             try {
                 packageName = getPackageNameFromCallingUid(Binder.getCallingUid());
             } catch (AccessControlException e) {
                 // Since packageName not found for calling process, try to find UUID mapping
                 // provided by vendors for the calling process UID
                 // (vendor provide UUID mapping for native services to access secure element)
                 Log.d(mTag, "openBasicChannel() trying to find mapping uuid");
                 // Allow UUID based access only on embedded secure elements eSE.
                 if (mReader.getTerminal().getName().startsWith(SecureElementService.ESE_TERMINAL)) {
                     uuid = getUUIDFromCallingUid(Binder.getCallingUid());
                 }
                 if (uuid == null) {
                     Log.e(mTag, "openBasicChannel() uuid mapping for calling uid is not found");
                     throw e;
                 }
             }
             Channel channel = null;

             try {
                 channel = mReader.getTerminal().openBasicChannel(this, aid, p2, listener,
                         packageName, uuid, Binder.getCallingPid());
             } catch (IOException e) {
                 throw new ServiceSpecificException(SEService.IO_ERROR, e.getMessage());
             } catch (NoSuchElementException e) {
                 throw new ServiceSpecificException(SEService.NO_SUCH_ELEMENT_ERROR, e.getMessage());
             }

             if (channel == null) {
                 Log.i(mTag, "OpenBasicChannel() - returning null");
                 return null;
             }
             Log.i(mTag, "Open basic channel success. Channel: "
                     + channel.getChannelNumber());

             synchronized (mLock) {
                 mChannels.add(channel);
             }
             return channel.new SecureElementChannel();
         }

         @Override
         public ISecureElementChannel openLogicalChannel(byte[] aid, byte p2,
                 ISecureElementListener listener) throws RemoteException {
             if (DEBUG) {
                 Log.i(mTag, "openLogicalChannel() AID = "
                         + ByteArrayConverter.byteArrayToHexString(aid) + ", P2 = " + p2);
             }
             if (isClosed()) {
                 throw new IllegalStateException("Session is closed");
             } else if (listener == null) {
                 throw new NullPointerException("listener must not be null");
             } else if ((p2 != 0x00) && (p2 != 0x04) && (p2 != 0x08)
                     && (p2 != (byte) 0x0C)) {
                 throw new UnsupportedOperationException("p2 not supported: "
                         + String.format("%02x ", p2 & 0xFF));
             }

             String packageName = null;
             byte[] uuid = null;
             try {
                 packageName = getPackageNameFromCallingUid(Binder.getCallingUid());
             } catch (AccessControlException e) {
                 // Since packageName not found for calling process, try to find UUID mapping
                 // provided by vendors for the calling process UID
                 // (vendor provide UUID mapping for native services to access secure element)
                 Log.d(mTag, "openLogicalChannel() trying to find mapping uuid");
                 // Allow UUID based access only on embedded secure elements eSE.
                 if (mReader.getTerminal().getName().startsWith(SecureElementService.ESE_TERMINAL)) {
                     uuid = getUUIDFromCallingUid(Binder.getCallingUid());
                 }
                 if (uuid == null) {
                     Log.e(mTag, "openLogicalChannel() uuid mapping for calling uid is not found");
                     throw e;
                 }
             }
             Channel channel = null;

             try {
                 channel = mReader.getTerminal().openLogicalChannel(this, aid, p2, listener,
                         packageName, uuid, Binder.getCallingPid());
             } catch (IOException e) {
                 throw new ServiceSpecificException(SEService.IO_ERROR, e.getMessage());
             } catch (NoSuchElementException e) {
                 throw new ServiceSpecificException(SEService.NO_SUCH_ELEMENT_ERROR, e.getMessage());
             }

             if (channel == null) {
                 Log.i(mTag, "openLogicalChannel() - returning null");
                 return null;
             }
             Log.i(mTag, "openLogicalChannel() Success. Channel: "
                     + channel.getChannelNumber());

             synchronized (mLock) {
                 mChannels.add(channel);
             }
             return channel.new SecureElementChannel();
         }
     }

     private final BroadcastReceiver mMultiSimConfigChangedReceiver = new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
             String action = intent.getAction();
             if (action.equals(TelephonyManager.ACTION_MULTI_SIM_CONFIG_CHANGED)) {
                 int activeSimCount =
                         intent.getIntExtra(TelephonyManager.EXTRA_ACTIVE_SIM_SUPPORTED_COUNT, 1);
                 Log.i(mTag, "received action MultiSimConfigChanged. Refresh UICC terminals");
                 Log.i(mTag, "Current ActiveSimCount:" + activeSimCount
                         + ". Previous ActiveSimCount:" + mActiveSimCount);

                 // Check for any change to UICC SE HAL implementations
                 refreshUiccTerminals(activeSimCount);
             }
         }
     };
 }
	/*
	* 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.
	*/
	/*
	* Copyright (c) 2014-2017, The Linux Foundation.
	*/
	/*
	* Contributed by: Giesecke & Devrient GmbH.
	*/

	package com.android.se;

	import android.app.ActivityManager;
	import android.app.Service;
	import android.content.BroadcastReceiver;
	import android.content.Context;
	import android.content.Intent;
	import android.content.IntentFilter;
	import android.content.pm.PackageManager;
	import android.os.Binder;
	import android.os.Build;
	import android.os.IBinder;
	import android.os.RemoteException;
	import android.os.ServiceManager;
	import android.os.ServiceSpecificException;
	import android.os.UserHandle;
	import android.se.omapi.ISecureElementChannel;
	import android.se.omapi.ISecureElementListener;
	import android.se.omapi.ISecureElementReader;
	import android.se.omapi.ISecureElementService;
	import android.se.omapi.ISecureElementSession;
	import android.se.omapi.SEService;
	import android.telephony.TelephonyManager;
	import android.util.Log;

	import com.android.se.Terminal.SecureElementReader;
	import com.android.se.internal.ByteArrayConverter;
	import com.android.se.security.HalRefDoParser;

	import java.io.FileDescriptor;
	import java.io.IOException;
	import java.io.PrintWriter;
	import java.security.AccessControlException;
	import java.util.ArrayList;
	import java.util.LinkedHashMap;
	import java.util.List;
	import java.util.NoSuchElementException;
	import java.util.Vector;

	/**
	* Underlying implementation for OMAPI SEService
	*/
	public final class SecureElementService extends Service {

	public static final String UICC_TERMINAL = "SIM";
	public static final String ESE_TERMINAL = "eSE";
	public static final String VSTABLE_SECURE_ELEMENT_SERVICE =
	"android.se.omapi.ISecureElementService/default";
	private final String mTag = "SecureElementService";
	private static final boolean DEBUG = Build.IS_DEBUGGABLE;
	// LinkedHashMap will maintain the order of insertion
	private LinkedHashMap<String, Terminal> mTerminals = new LinkedHashMap<String, Terminal>();
	private int mActiveSimCount = 0;
	private class SecureElementServiceBinder extends ISecureElementService.Stub {

	@Override
	public String[] getReaders() throws RemoteException {
	try {
	// This determines calling process is application/framework
	String packageName = getPackageNameFromCallingUid(Binder.getCallingUid());
	Log.d(mTag, "getReaders() for " + packageName);
	return mTerminals.keySet().toArray(new String[mTerminals.size()]);
	} catch (AccessControlException e) {
	// since packagename not found, UUID might be used to access
	// allow only to use eSE readers with UUID based requests
	Vector<String> eSEReaders = new Vector<String>();
	for (String reader : mTerminals.keySet()) {
	if (reader.startsWith(SecureElementService.ESE_TERMINAL)) {
	Log.i(mTag, "Adding Reader: " + reader);
	eSEReaders.add(reader);
	}
	}

	return eSEReaders.toArray(new String[eSEReaders.size()]);
	}
	}

	@Override
	public ISecureElementReader getReader(String reader) throws RemoteException {
	Log.d(mTag, "getReader() " + reader);
	Terminal terminal = null;
	try {
	// This determines calling process is application/framework
	String packageName = getPackageNameFromCallingUid(Binder.getCallingUid());
	Log.d(mTag, "getReader() for " + packageName);
	terminal = getTerminal(reader);
	} catch (AccessControlException e) {
	// since packagename not found, UUID might be used to access
	// allow only to use eSE readers with UUID based requests
	if (reader.startsWith(SecureElementService.ESE_TERMINAL)) {
	terminal = getTerminal(reader);
	} else {
	Log.d(mTag, "only eSE readers can access SE using UUID");
	}
	}
	if (terminal != null) {
	return terminal.new SecureElementReader(SecureElementService.this);
	} else {
	throw new IllegalArgumentException("Reader: " + reader + " not supported");
	}
	}

	@Override
	public synchronized boolean[] isNFCEventAllowed(String reader, byte[] aid,
	String[] packageNames) throws RemoteException {
	if (aid == null \|\| aid.length == 0) {
	aid = new byte[]{0x00, 0x00, 0x00, 0x00, 0x00};
	}
	if (aid.length < 5 \|\| aid.length > 16) {
	throw new IllegalArgumentException("AID out of range");
	}
	if (packageNames == null \|\| packageNames.length == 0) {
	throw new IllegalArgumentException("package names not specified");
	}
	Terminal terminal = getTerminal(reader);
	UserHandle currentUser = new UserHandle(ActivityManager.getCurrentUser());
	return terminal.isNfcEventAllowed(
	createContextAsUser(currentUser, /flags=/0).getPackageManager(),
	aid, packageNames);
	}

	@Override
	protected void dump(FileDescriptor fd, PrintWriter writer, String[] args) {
	for (Terminal terminal : mTerminals.values()) {
	terminal.dump(writer);
	}
	}
	}

	private final ISecureElementService.Stub mSecureElementServiceBinder =
	new SecureElementServiceBinder();

	private final ISecureElementService.Stub mSecureElementServiceBinderVntf =
	new SecureElementServiceBinder();

	public SecureElementService() {
	super();
	}

	private void initialize() {
	// listen for events
	IntentFilter intentFilter = new IntentFilter();
	intentFilter.addAction(TelephonyManager.ACTION_MULTI_SIM_CONFIG_CHANGED);
	this.registerReceiver(mMultiSimConfigChangedReceiver, intentFilter);
	}

	/** Returns the terminal from the Reader name. */
	private Terminal getTerminal(String reader) {
	if (reader == null) {
	throw new NullPointerException("reader must not be null");
	}
	if (reader.equals("SIM")) {
	reader = "SIM1";
	}
	Terminal terminal = mTerminals.get(reader);
	if (terminal == null) {
	throw new IllegalArgumentException("Reader: " + reader + " doesn't exist");
	}
	return terminal;
	}

	@Override
	public IBinder onBind(Intent intent) {
	Log.i(mTag, Thread.currentThread().getName() + " onBind");
	if (ISecureElementService.class.getName().equals(intent.getAction())) {
	return mSecureElementServiceBinder;
	}
	return null;
	}

	@Override
	public void onCreate() {
	Log.i(mTag, Thread.currentThread().getName() + " onCreate");
	initialize();
	createTerminals();

	// Add vendor stable service only if it is configured
	if (getResources().getBoolean(R.bool.secure_element_vintf_enabled)) {
	ServiceManager.addService(VSTABLE_SECURE_ELEMENT_SERVICE,
	mSecureElementServiceBinderVntf);
	}

	// Since ISecureElementService is marked with VINTF stability
	// to use this same interface within the system partition, will use
	// forceDowngradeToSystemStability and register it.
	mSecureElementServiceBinder.forceDowngradeToSystemStability();
	ServiceManager.addService(Context.SECURE_ELEMENT_SERVICE, mSecureElementServiceBinder);
	}

	/**
	* In case the onDestroy is called, we free the memory and
	* close all the channels.
	*/
	public void onDestroy() {
	Log.i(mTag, "onDestroy");
	for (Terminal terminal : mTerminals.values()) {
	terminal.closeChannels();
	terminal.close();
	}
	if (mMultiSimConfigChangedReceiver != null) {
	this.unregisterReceiver(mMultiSimConfigChangedReceiver);
	}
	}

	private void addTerminals(String terminalName) {
	int index = 1;
	String name = null;
	if (terminalName.startsWith(SecureElementService.UICC_TERMINAL)) {
	index = mActiveSimCount + 1;
	}
	try {
	do {
	name = terminalName + Integer.toString(index);
	Terminal terminal = new Terminal(name, this);

	Log.i(mTag, "Check if terminal " + name + " is available.");
	// Only retry on fail for the first terminal of each type.
	terminal.initialize(index == 1);
	mTerminals.put(name, terminal);
	if (terminalName.equals(UICC_TERMINAL)) {
	mActiveSimCount = index;
	}
	} while (++index > 0);
	} catch (NoSuchElementException e) {
	Log.i(mTag, "No HAL implementation for " + name);
	} catch (RemoteException \| RuntimeException e) {
	Log.e(mTag, "Error in getService() for " + name);
	}
	}

	private void createTerminals() {
	// Check for all SE HAL implementations
	addTerminals(ESE_TERMINAL);
	addTerminals(UICC_TERMINAL);
	}

	private void refreshUiccTerminals(int activeSimCount) {
	String name = null;
	synchronized (this) {
	if (activeSimCount < mActiveSimCount) {
	// Remove non-supported UICC terminals
	for (int i = activeSimCount + 1; i <= mActiveSimCount; i++) {
	name = UICC_TERMINAL + Integer.toString(i);
	Terminal terminal = mTerminals.get(name);
	if (terminal != null) {
	terminal.closeChannels();
	terminal.close();
	}
	mTerminals.remove(name);
	Log.i(mTag, name + " is removed from available Terminals");
	}
	mActiveSimCount = activeSimCount;
	} else if (activeSimCount > mActiveSimCount) {
	// Try to initialize new UICC terminals
	addTerminals(UICC_TERMINAL);
	}
	}
	}

	private String getPackageNameFromCallingUid(int uid) {
	PackageManager packageManager = getPackageManager();
	if (packageManager != null) {
	String[] packageName = packageManager.getPackagesForUid(uid);
	if (packageName != null && packageName.length > 0) {
	return packageName[0];
	}
	}
	throw new AccessControlException("PackageName can not be determined");
	}

	private byte[] getUUIDFromCallingUid(int uid) {
	byte[] uuid = HalRefDoParser.getInstance().findUUID(Binder.getCallingUid());

	if (uuid != null) {
	return uuid;
	}

	return null;
	}

	final class SecureElementSession extends ISecureElementSession.Stub {

	private final SecureElementReader mReader;
	/** List of open channels in use of by this client. */
	private final List<Channel> mChannels = new ArrayList<>();
	private final Object mLock = new Object();
	private boolean mIsClosed;
	private byte[] mAtr;

	SecureElementSession(SecureElementReader reader) {
	if (reader == null) {
	throw new NullPointerException("SecureElementReader cannot be null");
	}
	mReader = reader;
	mAtr = mReader.getAtr();
	mIsClosed = false;
	}

	public ISecureElementReader getReader() throws RemoteException {
	return mReader;
	}

	@Override
	public byte[] getAtr() throws RemoteException {
	return mAtr;
	}

	@Override
	public void close() throws RemoteException {
	closeChannels();
	mReader.removeSession(this);
	synchronized (mLock) {
	mIsClosed = true;
	}
	}

	void removeChannel(Channel channel) {
	synchronized (mLock) {
	if (mChannels != null) {
	mChannels.remove(channel);
	}
	}
	}

	@Override
	public void closeChannels() throws RemoteException {
	synchronized (mLock) {
	while (mChannels.size() > 0) {
	try {
	mChannels.get(0).close();
	} catch (Exception ignore) {
	Log.e(mTag, "SecureElementSession Channel - close Exception "
	+ ignore.getMessage());
	}
	}
	}
	}

	@Override
	public boolean isClosed() throws RemoteException {
	synchronized (mLock) {
	return mIsClosed;
	}
	}

	@Override
	public ISecureElementChannel openBasicChannel(byte[] aid, byte p2,
	ISecureElementListener listener) throws RemoteException {
	if (DEBUG) {
	Log.i(mTag, "openBasicChannel() AID = "
	+ ByteArrayConverter.byteArrayToHexString(aid) + ", P2 = " + p2);
	}
	if (isClosed()) {
	throw new IllegalStateException("Session is closed");
	} else if (listener == null) {
	throw new NullPointerException("listener must not be null");
	} else if ((p2 != 0x00) && (p2 != 0x04) && (p2 != 0x08)
	&& (p2 != (byte) 0x0C)) {
	throw new UnsupportedOperationException("p2 not supported: "
	+ String.format("%02x ", p2 & 0xFF));
	}

	String packageName = null;
	byte[] uuid = null;
	try {
	packageName = getPackageNameFromCallingUid(Binder.getCallingUid());
	} catch (AccessControlException e) {
	// Since packageName not found for calling process, try to find UUID mapping
	// provided by vendors for the calling process UID
	// (vendor provide UUID mapping for native services to access secure element)
	Log.d(mTag, "openBasicChannel() trying to find mapping uuid");
	// Allow UUID based access only on embedded secure elements eSE.
	if (mReader.getTerminal().getName().startsWith(SecureElementService.ESE_TERMINAL)) {
	uuid = getUUIDFromCallingUid(Binder.getCallingUid());
	}
	if (uuid == null) {
	Log.e(mTag, "openBasicChannel() uuid mapping for calling uid is not found");
	throw e;
	}
	}
	Channel channel = null;

	try {
	channel = mReader.getTerminal().openBasicChannel(this, aid, p2, listener,
	packageName, uuid, Binder.getCallingPid());
	} catch (IOException e) {
	throw new ServiceSpecificException(SEService.IO_ERROR, e.getMessage());
	} catch (NoSuchElementException e) {
	throw new ServiceSpecificException(SEService.NO_SUCH_ELEMENT_ERROR, e.getMessage());
	}

	if (channel == null) {
	Log.i(mTag, "OpenBasicChannel() - returning null");
	return null;
	}
	Log.i(mTag, "Open basic channel success. Channel: "
	+ channel.getChannelNumber());

	synchronized (mLock) {
	mChannels.add(channel);
	}
	return channel.new SecureElementChannel();
	}

	@Override
	public ISecureElementChannel openLogicalChannel(byte[] aid, byte p2,
	ISecureElementListener listener) throws RemoteException {
	if (DEBUG) {
	Log.i(mTag, "openLogicalChannel() AID = "
	+ ByteArrayConverter.byteArrayToHexString(aid) + ", P2 = " + p2);
	}
	if (isClosed()) {
	throw new IllegalStateException("Session is closed");
	} else if (listener == null) {
	throw new NullPointerException("listener must not be null");
	} else if ((p2 != 0x00) && (p2 != 0x04) && (p2 != 0x08)
	&& (p2 != (byte) 0x0C)) {
	throw new UnsupportedOperationException("p2 not supported: "
	+ String.format("%02x ", p2 & 0xFF));
	}

	String packageName = null;
	byte[] uuid = null;
	try {
	packageName = getPackageNameFromCallingUid(Binder.getCallingUid());
	} catch (AccessControlException e) {
	// Since packageName not found for calling process, try to find UUID mapping
	// provided by vendors for the calling process UID
	// (vendor provide UUID mapping for native services to access secure element)
	Log.d(mTag, "openLogicalChannel() trying to find mapping uuid");
	// Allow UUID based access only on embedded secure elements eSE.
	if (mReader.getTerminal().getName().startsWith(SecureElementService.ESE_TERMINAL)) {
	uuid = getUUIDFromCallingUid(Binder.getCallingUid());
	}
	if (uuid == null) {
	Log.e(mTag, "openLogicalChannel() uuid mapping for calling uid is not found");
	throw e;
	}
	}
	Channel channel = null;

	try {
	channel = mReader.getTerminal().openLogicalChannel(this, aid, p2, listener,
	packageName, uuid, Binder.getCallingPid());
	} catch (IOException e) {
	throw new ServiceSpecificException(SEService.IO_ERROR, e.getMessage());
	} catch (NoSuchElementException e) {
	throw new ServiceSpecificException(SEService.NO_SUCH_ELEMENT_ERROR, e.getMessage());
	}

	if (channel == null) {
	Log.i(mTag, "openLogicalChannel() - returning null");
	return null;
	}
	Log.i(mTag, "openLogicalChannel() Success. Channel: "
	+ channel.getChannelNumber());

	synchronized (mLock) {
	mChannels.add(channel);
	}
	return channel.new SecureElementChannel();
	}
	}

	private final BroadcastReceiver mMultiSimConfigChangedReceiver = new BroadcastReceiver() {
	@Override
	public void onReceive(Context context, Intent intent) {
	String action = intent.getAction();
	if (action.equals(TelephonyManager.ACTION_MULTI_SIM_CONFIG_CHANGED)) {
	int activeSimCount =
	intent.getIntExtra(TelephonyManager.EXTRA_ACTIVE_SIM_SUPPORTED_COUNT, 1);
	Log.i(mTag, "received action MultiSimConfigChanged. Refresh UICC terminals");
	Log.i(mTag, "Current ActiveSimCount:" + activeSimCount
	+ ". Previous ActiveSimCount:" + mActiveSimCount);

	// Check for any change to UICC SE HAL implementations
	refreshUiccTerminals(activeSimCount);
	}
	}
	};
	}