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/*
* 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) 2015-2017, The Linux Foundation.
*/
/*
* Copyright (C) 2011 Deutsche Telekom, A.G.
*
* 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.
*/
/*
* Contributed by: Giesecke & Devrient GmbH.
*/
package com.android.se.security.arf;
import android.util.Log;
import com.android.se.Channel;
import com.android.se.Terminal;
import com.android.se.security.ChannelAccess;
import com.android.se.security.arf.pkcs15.EF;
import com.android.se.security.gpac.AID_REF_DO;
import com.android.se.security.gpac.Hash_REF_DO;
import com.android.se.security.gpac.REF_DO;
import java.io.IOException;
import java.util.MissingResourceException;
import java.util.NoSuchElementException;
/**
* Provides high-level functions for SE communication
*/
public class SecureElement {
public final String mTag = "SecureElement-ARF";
// Logical channel used for SE communication (optional)
private Channel mArfChannel = null;
// Handle to a built-in "Secure Element"
private Terminal mTerminalHandle = null;
// Arf Controller within the SCAPI handler
private ArfController mArfHandler = null;
/**
* Constructor
*
* @param arfHandler - handle to the owning arf controller object
* @param handle - handle to the SE terminal to be accessed.
*/
public SecureElement(ArfController arfHandler, Terminal handle) {
mTerminalHandle = handle;
mArfHandler = arfHandler;
}
/**
* Transmits ADPU commands
*
* @param cmd APDU command
* @return Data returned by the APDU command
*/
public byte[] exchangeAPDU(EF ef, byte[] cmd) throws IOException, SecureElementException {
try {
return mArfChannel.transmit(cmd);
} catch (IOException e) {
// Communication error happened while the terminal sending a command.
throw e;
} catch (Exception e) {
throw new SecureElementException(
"Secure Element access error " + e.getLocalizedMessage());
}
}
/**
* Opens a logical channel to ARF Applet or ADF
*
* @param aid Applet identifier
* @return Handle to "Logical Channel" allocated by the SE; <code>0</code> if error occurred
*/
public Channel openLogicalArfChannel(byte[] aid) throws IOException, MissingResourceException,
NoSuchElementException {
try {
mArfChannel = mTerminalHandle.openLogicalChannelWithoutChannelAccess(aid);
if (mArfChannel == null) {
throw new MissingResourceException("No channel was available", "", "");
}
setUpChannelAccess(mArfChannel);
return mArfChannel;
} catch (IOException | MissingResourceException | NoSuchElementException e) {
throw e;
} catch (Exception e) {
Log.e(mTag, "Error opening logical channel " + e.getLocalizedMessage());
mArfChannel = null;
return null;
}
}
/**
* Closes a logical channel previously allocated by the SE
*/
public void closeArfChannel() {
try {
if (mArfChannel != null) {
mArfChannel.close();
mArfChannel = null;
}
} catch (Exception e) {
Log.e(mTag, "Error closing channel " + e.getLocalizedMessage());
}
}
/**
* Set up channel access to allow, so that PKCS15 files can be read.
*/
private void setUpChannelAccess(Channel channel) {
// set access conditions to access ARF.
ChannelAccess arfChannelAccess = new ChannelAccess();
arfChannelAccess.setAccess(ChannelAccess.ACCESS.ALLOWED, "");
arfChannelAccess.setApduAccess(ChannelAccess.ACCESS.ALLOWED);
channel.setChannelAccess(arfChannelAccess);
}
/** Fetches the Refresh Tag */
public byte[] getRefreshTag() {
if (mArfHandler != null) {
return mArfHandler.getAccessRuleCache().getRefreshTag();
}
return null;
}
/** Sets the given Refresh Tag */
public void setRefreshTag(byte[] refreshTag) {
if (mArfHandler != null) {
mArfHandler.getAccessRuleCache().setRefreshTag(refreshTag);
}
}
/** Addsthe Access Rule to the Cache */
public void putAccessRule(
AID_REF_DO aidRefDo, Hash_REF_DO hashRefDo, ChannelAccess channelAccess) {
REF_DO ref_do = new REF_DO(aidRefDo, hashRefDo);
mArfHandler.getAccessRuleCache().putWithMerge(ref_do, channelAccess);
}
/** Resets the Access Rule Cache */
public void resetAccessRules() {
this.mArfHandler.getAccessRuleCache().reset();
}
/** Clears the Access Rule Cache */
public void clearAccessRuleCache() {
this.mArfHandler.getAccessRuleCache().clearCache();
}
}
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