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Code Issues Releases Wiki Activity

add barely functional nfc intent activity (WIP!)

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This commit is contained in:
Vincent Breitmoser 2014-09-29 21:31:19 +02:00
parent 801fe4d816
commit 7f547afe42
2 changed files with 324 additions and 0 deletions
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12
OpenKeychain/src/main/AndroidManifest.xml
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@ -623,6 +623,18 @@
<activity
android:name=".ui.NfcActivity"
android:launchMode="singleTop" />
<activity
android:name=".ui.NfcIntentActivity"
android:launchMode="singleTop">
<intent-filter>
<action android:name="android.nfc.action.NDEF_DISCOVERED" />
<category android:name="android.intent.category.DEFAULT" />
<data android:host="my.yubico.com" android:scheme="https"/>
</intent-filter>
</activity>
<activity
android:name=".ui.HelpActivity"
android:label="@string/title_help" />

312
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/NfcIntentActivity.java Normal file
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@ -0,0 +1,312 @@
/**
* Copyright (c) 2013-2014 Philipp Jakubeit, Signe Rüsch, Dominik Schürmann
*
* Licensed under the Bouncy Castle License (MIT license). See LICENSE file for details.
*/
package org.sufficientlysecure.keychain.ui;
import android.annotation.TargetApi;
import android.app.PendingIntent;
import android.content.Intent;
import android.content.IntentFilter;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.IsoDep;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.WindowManager;
import android.widget.Toast;
import org.spongycastle.util.encoders.Hex;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.R;
import org.sufficientlysecure.keychain.util.Iso7816TLV;
import org.sufficientlysecure.keychain.ui.util.KeyFormattingUtils;
import org.sufficientlysecure.keychain.util.Log;
import java.io.IOException;
import java.nio.ByteBuffer;
/**
* This class provides a communication interface to OpenPGP applications on ISO SmartCard compliant
* NFC devices.
*
* For the full specs, see http://g10code.com/docs/openpgp-card-2.0.pdf
*/
@TargetApi(Build.VERSION_CODES.GINGERBREAD_MR1)
public class NfcIntentActivity extends ActionBarActivity {
// special extra for OpenPgpService
public static final String EXTRA_DATA = "data";
private Intent mServiceIntent;
private static final int TIMEOUT = 100000;
private NfcAdapter mNfcAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d(Constants.TAG, "NfcActivity.onCreate");
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
setContentView(R.layout.nfc_activity);
Intent intent = getIntent();
Bundle data = intent.getExtras();
String action = intent.getAction();
Log.d(Constants.TAG, action);
Log.d(Constants.TAG, intent.getDataString());
// TODO check fingerprint
// mFingerprint = data.getByteArray(EXTRA_FINGERPRINT);
if (!NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action)) {
Log.d(Constants.TAG, "Action not supported: " + action);
finish();
}
try {
Tag detectedTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
// Connect to the detected tag, setting a couple of settings
IsoDep isoDep = IsoDep.get(detectedTag);
isoDep.setTimeout(TIMEOUT); // timeout is set to 100 seconds to avoid cancellation during calculation
isoDep.connect();
nfcGreet(isoDep);
// nfcPin(isoDep, "yoloswag");
nfcGetFingerprint(isoDep);
} catch (IOException e) {
Log.e(Constants.TAG, "IOException!", e);
finish();
}
}
/**
* Called when the system is about to start resuming a previous activity,
* disables NFC Foreground Dispatch
*/
public void onPause() {
super.onPause();
Log.d(Constants.TAG, "NfcActivity.onPause");
// disableNfcForegroundDispatch();
}
/**
* Called when the activity will start interacting with the user,
* enables NFC Foreground Dispatch
*/
public void onResume() {
super.onResume();
Log.d(Constants.TAG, "NfcActivity.onResume");
// enableNfcForegroundDispatch();
}
/** Handle NFC communication and return a result.
*
* This method is called by onNewIntent above upon discovery of an NFC tag.
* It handles initialization and login to the application, subsequently
* calls either nfcCalculateSignature() or nfcDecryptSessionKey(), then
* finishes the activity with an appropiate result.
*
* On general communication, see also
* http://www.cardwerk.com/smartcards/smartcard_standard_ISO7816-4_annex-a.aspx
*
* References to pages are generally related to the OpenPGP Application
* on ISO SmartCard Systems specification.
*
*/
private void nfcGreet(IsoDep isoDep) throws IOException {
// SW1/2 0x9000 is the generic "ok" response, which we expect most of the time.
// See specification, page 51
String accepted = "9000";
// Command APDU (page 51) for SELECT FILE command (page 29)
String opening =
"00" // CLA
+ "A4" // INS
+ "04" // P1
+ "00" // P2
+ "06" // Lc (number of bytes)
+ "D27600012401" // Data (6 bytes)
+ "00"; // Le
if (!card(isoDep, opening).equals(accepted)) { // activate connection
toast("Opening Error!");
setResult(RESULT_CANCELED, mServiceIntent);
finish();
}
}
private void nfcPin(IsoDep isoDep, String pin) throws IOException {
String data = "00CA006E00";
String fingerprint = card(isoDep, data);
// Command APDU for VERIFY command (page 32)
String login =
"00" // CLA
+ "20" // INS
+ "00" // P1
+ "82" // P2 (PW1)
+ String.format("%02x", pin.length()) // Lc
+ Hex.toHexString(pin.getBytes());
if ( ! card(isoDep, login).equals("9000")) { // login
toast("Pin Error!");
setResult(RESULT_CANCELED, mServiceIntent);
finish();
}
}
/**
* Gets the user ID
*
* @return the user id as "name <email>"
* @throws java.io.IOException
*/
public static String getUserId(IsoDep isoDep) throws IOException {
String info = "00CA006500";
String data = "00CA005E00";
return getName(card(isoDep, info)) + " <" + (new String(Hex.decode(getDataField(card(isoDep, data))))) + ">";
}
/**
* Gets the long key ID
*
* @return the long key id (last 16 bytes of the fingerprint)
* @throws java.io.IOException
*/
public static long getKeyId(IsoDep isoDep) throws IOException {
String keyId = nfcGetFingerprint(isoDep).substring(24);
Log.d(Constants.TAG, "keyId: " + keyId);
return Long.parseLong(keyId, 16);
}
/**
* Gets the fingerprint of the signature key
*
* @return the fingerprint
* @throws java.io.IOException
*/
public static String nfcGetFingerprint(IsoDep isoDep) throws IOException {
String data = "00CA006E00";
byte[] buf = isoDep.transceive(Hex.decode(data));
Iso7816TLV tlv = Iso7816TLV.readSingle(buf, true);
Log.d(Constants.TAG, "nfc tlv data:\n" + tlv.prettyPrint());
Iso7816TLV fptlv = Iso7816TLV.findRecursive(tlv, 0xc5);
if (fptlv != null) {
ByteBuffer fpbuf = ByteBuffer.wrap(fptlv.mV);
byte[] fp = new byte[20];
fpbuf.get(fp);
Log.d(Constants.TAG, "fingerprint 1: " + KeyFormattingUtils.convertFingerprintToHex(fp));
fpbuf.get(fp);
Log.d(Constants.TAG, "fingerprint 2: " + KeyFormattingUtils.convertFingerprintToHex(fp));
fpbuf.get(fp);
Log.d(Constants.TAG, "fingerprint 3: " + KeyFormattingUtils.convertFingerprintToHex(fp));
}
return "nope";
}
/**
* Prints a message to the screen
*
* @param text the text which should be contained within the toast
*/
private void toast(String text) {
Toast.makeText(this, text, Toast.LENGTH_LONG).show();
}
/**
* Receive new NFC Intents to this activity only by enabling foreground dispatch.
* This can only be done in onResume!
*/
public void enableNfcForegroundDispatch() {
mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
Intent nfcI = new Intent(this, NfcIntentActivity.class)
.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent nfcPendingIntent = PendingIntent.getActivity(this, 0, nfcI, 0);
IntentFilter[] writeTagFilters = new IntentFilter[]{
new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED)
};
// https://code.google.com/p/android/issues/detail?id=62918
// maybe mNfcAdapter.enableReaderMode(); ?
try {
mNfcAdapter.enableForegroundDispatch(this, nfcPendingIntent, writeTagFilters, null);
} catch (IllegalStateException e) {
Log.i(Constants.TAG, "NfcForegroundDispatch Error!", e);
}
Log.d(Constants.TAG, "NfcForegroundDispatch has been enabled!");
}
/**
* Disable foreground dispatch in onPause!
*/
public void disableNfcForegroundDispatch() {
mNfcAdapter.disableForegroundDispatch(this);
Log.d(Constants.TAG, "NfcForegroundDispatch has been disabled!");
}
/**
* Gets the name of the user out of the raw card output regarding card holder related data
*
* @param name the raw card holder related data from the card
* @return the name given in this data
*/
public static String getName(String name) {
String slength;
int ilength;
name = name.substring(6);
slength = name.substring(0, 2);
ilength = Integer.parseInt(slength, 16) * 2;
name = name.substring(2, ilength + 2);
name = (new String(Hex.decode(name))).replace('<', ' ');
return (name);
}
/**
* Reduces the raw data from the card by four characters
*
* @param output the raw data from the card
* @return the data field of that data
*/
private static String getDataField(String output) {
return output.substring(0, output.length() - 4);
}
/**
* Communicates with the OpenPgpCard via the APDU
*
* @param hex the hexadecimal APDU
* @return The answer from the card
* @throws java.io.IOException throws an exception if something goes wrong
*/
public static String card(IsoDep isoDep, String hex) throws IOException {
return getHex(isoDep.transceive(Hex.decode(hex)));
}
/**
* Converts a byte array into an hex string
*
* @param raw the byte array representation
* @return the hexadecimal string representation
*/
public static String getHex(byte[] raw) {
return new String(Hex.encode(raw));
}
}