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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) 2017, The Linux Foundation.
*/
/*
* Contributed by: Giesecke & Devrient GmbH.
*/
package android.se.omapi;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.os.RemoteException;
import android.os.ServiceSpecificException;
import android.util.Log;
import java.io.IOException;
import java.util.NoSuchElementException;
/**
* Instances of this class represent a connection session to one of the Secure
* Elements available on the device. These objects can be used to get a
* communication channel with an Applet in the Secure Element.
* This channel can be the basic channel or a logical channel.
*
* @see <a href="http://simalliance.org">SIMalliance Open Mobile API v3.0</a>
*/
public final class Session {
private final Object mLock = new Object();
private final SEService mService;
private final Reader mReader;
private final ISecureElementSession mSession;
private static final String TAG = "OMAPI.Session";
Session(@NonNull SEService service, @NonNull ISecureElementSession session,
@NonNull Reader reader) {
if (service == null || reader == null || session == null) {
throw new IllegalArgumentException("Parameters cannot be null");
}
mService = service;
mReader = reader;
mSession = session;
}
/**
* Get the reader that provides this session.
*
* @return The Reader object.
*/
public @NonNull Reader getReader() {
return mReader;
}
/**
* Get the Answer to Reset of this Secure Element. <br>
* The returned byte array can be null if the ATR for this Secure Element is
* not available.
*
* @throws IllegalStateException if there was an error connecting to SE or
* if the service was not connected.
* @return the ATR as a byte array or null.
*/
public @Nullable byte[] getATR() {
if (!mService.isConnected()) {
throw new IllegalStateException("service not connected to system");
}
try {
return mSession.getAtr();
} catch (RemoteException e) {
throw new IllegalStateException(e.getMessage());
}
}
/**
* Close the connection with the Secure Element. This will close any
* channels opened by this application with this Secure Element.
*/
public void close() {
if (!mService.isConnected()) {
Log.e(TAG, "service not connected to system");
return;
}
synchronized (mLock) {
try {
mSession.close();
} catch (RemoteException e) {
Log.e(TAG, "Error closing session", e);
}
}
}
/**
* Tells if this session is closed.
*
* @return <code>true</code> if the session is closed, false otherwise.
*/
public boolean isClosed() {
try {
return mSession.isClosed();
} catch (RemoteException e) {
// If there was an error here, then the session is considered close
return true;
}
}
/**
* Close any channel opened on this session.
*/
public void closeChannels() {
if (!mService.isConnected()) {
Log.e(TAG, "service not connected to system");
return;
}
synchronized (mLock) {
try {
mSession.closeChannels();
} catch (RemoteException e) {
Log.e(TAG, "Error closing channels", e);
}
}
}
/**
* Get an access to the basic channel, as defined in the ISO/IEC 7816-4 specification (the
* one that has number 0). The obtained object is an instance of the Channel class.
* If the AID is null, it means no Applet is to be selected on this channel and the default
* Applet is used. If the AID is defined then the corresponding Applet is selected.
* Once this channel has been opened by a device application, it is considered as "locked"
* by this device application, and other calls to this method will return null, until the
* channel is closed. Some Secure Elements (like the UICC) might always keep the basic channel
* locked (i.e. return null to applications), to prevent access to the basic channel, while
* some other might return a channel object implementing some kind of filtering on the
* commands, restricting the set of accepted command to a smaller set.
* It is recommended for the UICC to reject the opening of the basic channel to a specific
* applet, by always answering null to such a request.
* For other Secure Elements, the recommendation is to accept opening the basic channel
* on the default applet until another applet is selected on the basic channel. As there is no
* other way than a reset to select again the default applet, the implementation of the
* transport API should guarantee that the openBasicChannel(null) command will return
* null until a reset occurs.
* With previous release (V2.05) it was not possible to set P2 value, this value was always
* set to '00'.Except for specific needs it is recommended to keep P2 to '00'. It is
* recommended that the device allows all values for P2, however only the following values
* are mandatory: '00', '04', '08', '0C'(as defined in [2])
* The implementation of the underlying SELECT command within this method shall be
* based on ISO 7816-4 with following options:
* <ul>
* <li>CLA = '00'</li>
* <li>INS = 'A4'</li>
* <li>P1 = '04' (Select by DF name/application identifier)</li>
* </ul>
*
* The select response data can be retrieved with byte[] getSelectResponse().
* The API shall handle received status word as follow. If the status word indicates that the
* Secure Element was able to open a channel (e.g. status word '90 00' or status words
* referencing a warning in ISO-7816-4: '62 XX' or '63 XX') the API shall keep the
* channel opened and the next getSelectResponse() shall return the received status
* word.
* Other received status codes indicating that the Secure Element was able not to open a
* channel shall be considered as an error and the corresponding channel shall not be
* opened.
* The function without P2 as parameter is provided for backwards compatibility and will
* fall back to a select command with P2='00'.
*
* @param aid the AID of the Applet to be selected on this channel, as a
* byte array, or null if no Applet is to be selected.
* @param p2 the P2 parameter of the SELECT APDU executed on this channel.
* @throws IOException if there is a communication problem to the reader or
* the Secure Element.
* @throws IllegalStateException if the Secure Element session is used after
* being closed.
* @throws IllegalArgumentException if the aid's length is not within 5 to
* 16 (inclusive).
* @throws SecurityException if the calling application cannot be granted
* access to this AID or the default Applet on this
* session.
* @throws NoSuchElementException if the AID on the Secure Element is not available or cannot be
* selected.
* @throws UnsupportedOperationException if the given P2 parameter is not
* supported by the device
* @return an instance of Channel if available or null.
*/
public @Nullable Channel openBasicChannel(@Nullable byte[] aid, @Nullable byte p2)
throws IOException {
if (!mService.isConnected()) {
throw new IllegalStateException("service not connected to system");
}
synchronized (mLock) {
try {
ISecureElementChannel channel = mSession.openBasicChannel(aid, p2,
mReader.getSEService().getListener());
if (channel == null) {
return null;
}
return new Channel(mService, this, channel);
} catch (ServiceSpecificException e) {
if (e.errorCode == SEService.IO_ERROR) {
throw new IOException(e.getMessage());
} else if (e.errorCode == SEService.NO_SUCH_ELEMENT_ERROR) {
throw new NoSuchElementException(e.getMessage());
} else {
throw new IllegalStateException(e.getMessage());
}
} catch (RemoteException e) {
throw new IllegalStateException(e.getMessage());
}
}
}
/**
* This method is provided to ease the development of mobile application and for compliancy
* with existing applications.
* This method is equivalent to openBasicChannel(aid, P2=0x00)
*
* @param aid the AID of the Applet to be selected on this channel, as a
* byte array, or null if no Applet is to be selected.
* @throws IOException if there is a communication problem to the reader or
* the Secure Element.
* @throws IllegalStateException if the Secure Element session is used after
* being closed.
* @throws IllegalArgumentException if the aid's length is not within 5 to
* 16 (inclusive).
* @throws SecurityException if the calling application cannot be granted
* access to this AID or the default Applet on this
* session.
* @throws NoSuchElementException if the AID on the Secure Element is not available or cannot be
* selected.
* @throws UnsupportedOperationException if the given P2 parameter is not
* supported by the device
* @return an instance of Channel if available or null.
*/
public @Nullable Channel openBasicChannel(@Nullable byte[] aid) throws IOException {
return openBasicChannel(aid, (byte) 0x00);
}
/**
* Open a logical channel with the Secure Element, selecting the Applet represented by
* the given AID. If the AID is null, which means no Applet is to be selected on this
* channel, the default Applet is used. It's up to the Secure Element to choose which
* logical channel will be used.
* With previous release (V2.05) it was not possible to set P2 value, this value was always
* set to '00'.Except for specific needs it is recommended to keep P2 to '00'. It is
* recommended that the device allows all values for P2, however only the following values
* are mandatory: '00', '04', '08', '0C'(as defined in [2])
* The implementation of the underlying SELECT command within this method shall be
* based on ISO 7816-4 with following options:
*
* <ul>
* <li>CLA = '01' to '03', '40 to 4F'</li>
* <li>INS = 'A4'</li>
* <li>P1 = '04' (Select by DF name/application identifier)</li>
* </ul>
*
* The select response data can be retrieved with byte[] getSelectResponse().
* The API shall handle received status word as follow. If the status word indicates that the
* Secure Element was able to open a channel (e.g. status word '90 00' or status words
* referencing a warning in ISO-7816-4: '62 XX' or '63 XX') the API shall keep the
* channel opened and the next getSelectResponse() shall return the received status
* word.
* Other received status codes indicating that the Secure Element was able not to open a
* channel shall be considered as an error and the corresponding channel shall not be
* opened.
* In case of UICC it is recommended for the API to reject the opening of the logical
* channel without a specific AID, by always answering null to such a request.
* The function without P2 as parameter is provided for backwards compatibility and will
* fall back to a select command with P2=00.
*
* @param aid the AID of the Applet to be selected on this channel, as a
* byte array.
* @param p2 the P2 parameter of the SELECT APDU executed on this channel.
* @throws IOException if there is a communication problem to the reader or
* the Secure Element.
* @throws IllegalStateException if the Secure Element is used after being
* closed.
* @throws IllegalArgumentException if the aid's length is not within 5 to
* 16 (inclusive).
* @throws SecurityException if the calling application cannot be granted
* access to this AID or the default Applet on this
* session.
* @throws NoSuchElementException if the AID on the Secure Element is not
* available or cannot be selected or a logical channel is already
* open to a non-multiselectable Applet.
* @throws UnsupportedOperationException if the given P2 parameter is not
* supported by the device.
* @return an instance of Channel. Null if the Secure Element is unable to
* provide a new logical channel.
*/
public @Nullable Channel openLogicalChannel(@Nullable byte[] aid, @Nullable byte p2)
throws IOException {
if (!mService.isConnected()) {
throw new IllegalStateException("service not connected to system");
}
synchronized (mLock) {
try {
ISecureElementChannel channel = mSession.openLogicalChannel(
aid,
p2,
mReader.getSEService().getListener());
if (channel == null) {
return null;
}
return new Channel(mService, this, channel);
} catch (ServiceSpecificException e) {
if (e.errorCode == SEService.IO_ERROR) {
throw new IOException(e.getMessage());
} else if (e.errorCode == SEService.NO_SUCH_ELEMENT_ERROR) {
throw new NoSuchElementException(e.getMessage());
} else {
throw new IllegalStateException(e.getMessage());
}
} catch (RemoteException e) {
throw new IllegalStateException(e.getMessage());
}
}
}
/**
* This method is provided to ease the development of mobile application and for compliancy
* with existing applications.
* This method is equivalent to openLogicalChannel(aid, P2=0x00)
*
* @param aid the AID of the Applet to be selected on this channel, as a
* byte array.
* @throws IOException if there is a communication problem to the reader or
* the Secure Element.
* @throws IllegalStateException if the Secure Element is used after being
* closed.
* @throws IllegalArgumentException if the aid's length is not within 5 to
* 16 (inclusive).
* @throws SecurityException if the calling application cannot be granted
* access to this AID or the default Applet on this
* session.
* @throws NoSuchElementException if the AID on the Secure Element is not
* available or cannot be selected or a logical channel is already
* open to a non-multiselectable Applet.
* @throws UnsupportedOperationException if the given P2 parameter is not
* supported by the device.
* @return an instance of Channel. Null if the Secure Element is unable to
* provide a new logical channel.
*/
public @Nullable Channel openLogicalChannel(@Nullable byte[] aid) throws IOException {
return openLogicalChannel(aid, (byte) 0x00);
}
}