mirror of
https://github.com/moparisthebest/open-keychain
synced 2024-12-25 00:18:51 -05:00
add barely functional nfc intent activity (WIP!)
This commit is contained in:
Vincent Breitmoser
parent
801fe4d816
commit
7f547afe42
@ -623,6 +623,18 @@
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<activity
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android:name=".ui.NfcActivity"
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android:launchMode="singleTop" />
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<activity
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android:name=".ui.NfcIntentActivity"
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android:launchMode="singleTop">
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<intent-filter>
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<action android:name="android.nfc.action.NDEF_DISCOVERED" />
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<category android:name="android.intent.category.DEFAULT" />
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<data android:host="my.yubico.com" android:scheme="https"/>
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</intent-filter>
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</activity>
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<activity
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android:name=".ui.HelpActivity"
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android:label="@string/title_help" />
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@ -0,0 +1,312 @@
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/**
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* Copyright (c) 2013-2014 Philipp Jakubeit, Signe Rüsch, Dominik Schürmann
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*
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* Licensed under the Bouncy Castle License (MIT license). See LICENSE file for details.
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*/
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package org.sufficientlysecure.keychain.ui;
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import android.annotation.TargetApi;
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import android.app.PendingIntent;
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import android.content.Intent;
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import android.content.IntentFilter;
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import android.nfc.NfcAdapter;
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import android.nfc.Tag;
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import android.nfc.tech.IsoDep;
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import android.os.Build;
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import android.os.Bundle;
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import android.support.v7.app.ActionBarActivity;
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import android.view.WindowManager;
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import android.widget.Toast;
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import org.spongycastle.util.encoders.Hex;
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import org.sufficientlysecure.keychain.Constants;
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import org.sufficientlysecure.keychain.R;
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import org.sufficientlysecure.keychain.util.Iso7816TLV;
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import org.sufficientlysecure.keychain.ui.util.KeyFormattingUtils;
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import org.sufficientlysecure.keychain.util.Log;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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/**
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* This class provides a communication interface to OpenPGP applications on ISO SmartCard compliant
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* NFC devices.
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*
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* For the full specs, see http://g10code.com/docs/openpgp-card-2.0.pdf
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*/
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@TargetApi(Build.VERSION_CODES.GINGERBREAD_MR1)
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public class NfcIntentActivity extends ActionBarActivity {
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// special extra for OpenPgpService
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public static final String EXTRA_DATA = "data";
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private Intent mServiceIntent;
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private static final int TIMEOUT = 100000;
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private NfcAdapter mNfcAdapter;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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Log.d(Constants.TAG, "NfcActivity.onCreate");
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getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
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setContentView(R.layout.nfc_activity);
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Intent intent = getIntent();
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Bundle data = intent.getExtras();
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String action = intent.getAction();
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Log.d(Constants.TAG, action);
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Log.d(Constants.TAG, intent.getDataString());
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// TODO check fingerprint
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// mFingerprint = data.getByteArray(EXTRA_FINGERPRINT);
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if (!NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action)) {
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Log.d(Constants.TAG, "Action not supported: " + action);
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finish();
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}
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try {
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Tag detectedTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
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// Connect to the detected tag, setting a couple of settings
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IsoDep isoDep = IsoDep.get(detectedTag);
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isoDep.setTimeout(TIMEOUT); // timeout is set to 100 seconds to avoid cancellation during calculation
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isoDep.connect();
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nfcGreet(isoDep);
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// nfcPin(isoDep, "yoloswag");
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nfcGetFingerprint(isoDep);
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} catch (IOException e) {
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Log.e(Constants.TAG, "IOException!", e);
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finish();
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}
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}
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/**
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* Called when the system is about to start resuming a previous activity,
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* disables NFC Foreground Dispatch
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*/
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public void onPause() {
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super.onPause();
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Log.d(Constants.TAG, "NfcActivity.onPause");
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// disableNfcForegroundDispatch();
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}
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/**
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* Called when the activity will start interacting with the user,
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* enables NFC Foreground Dispatch
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*/
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public void onResume() {
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super.onResume();
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Log.d(Constants.TAG, "NfcActivity.onResume");
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// enableNfcForegroundDispatch();
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}
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/** Handle NFC communication and return a result.
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*
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* This method is called by onNewIntent above upon discovery of an NFC tag.
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* It handles initialization and login to the application, subsequently
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* calls either nfcCalculateSignature() or nfcDecryptSessionKey(), then
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* finishes the activity with an appropiate result.
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*
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* On general communication, see also
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* http://www.cardwerk.com/smartcards/smartcard_standard_ISO7816-4_annex-a.aspx
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*
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* References to pages are generally related to the OpenPGP Application
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* on ISO SmartCard Systems specification.
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*
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*/
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private void nfcGreet(IsoDep isoDep) throws IOException {
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// SW1/2 0x9000 is the generic "ok" response, which we expect most of the time.
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// See specification, page 51
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String accepted = "9000";
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// Command APDU (page 51) for SELECT FILE command (page 29)
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String opening =
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"00" // CLA
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+ "A4" // INS
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+ "04" // P1
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+ "00" // P2
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+ "06" // Lc (number of bytes)
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+ "D27600012401" // Data (6 bytes)
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+ "00"; // Le
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if (!card(isoDep, opening).equals(accepted)) { // activate connection
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toast("Opening Error!");
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setResult(RESULT_CANCELED, mServiceIntent);
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finish();
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}
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}
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private void nfcPin(IsoDep isoDep, String pin) throws IOException {
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String data = "00CA006E00";
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String fingerprint = card(isoDep, data);
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// Command APDU for VERIFY command (page 32)
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String login =
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"00" // CLA
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+ "20" // INS
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+ "00" // P1
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+ "82" // P2 (PW1)
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+ String.format("%02x", pin.length()) // Lc
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+ Hex.toHexString(pin.getBytes());
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if ( ! card(isoDep, login).equals("9000")) { // login
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toast("Pin Error!");
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setResult(RESULT_CANCELED, mServiceIntent);
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finish();
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}
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}
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/**
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* Gets the user ID
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*
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* @return the user id as "name <email>"
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* @throws java.io.IOException
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*/
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public static String getUserId(IsoDep isoDep) throws IOException {
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String info = "00CA006500";
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String data = "00CA005E00";
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return getName(card(isoDep, info)) + " <" + (new String(Hex.decode(getDataField(card(isoDep, data))))) + ">";
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}
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/**
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* Gets the long key ID
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*
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* @return the long key id (last 16 bytes of the fingerprint)
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* @throws java.io.IOException
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*/
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public static long getKeyId(IsoDep isoDep) throws IOException {
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String keyId = nfcGetFingerprint(isoDep).substring(24);
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Log.d(Constants.TAG, "keyId: " + keyId);
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return Long.parseLong(keyId, 16);
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}
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/**
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* Gets the fingerprint of the signature key
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*
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* @return the fingerprint
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* @throws java.io.IOException
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*/
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public static String nfcGetFingerprint(IsoDep isoDep) throws IOException {
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String data = "00CA006E00";
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byte[] buf = isoDep.transceive(Hex.decode(data));
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Iso7816TLV tlv = Iso7816TLV.readSingle(buf, true);
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Log.d(Constants.TAG, "nfc tlv data:\n" + tlv.prettyPrint());
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Iso7816TLV fptlv = Iso7816TLV.findRecursive(tlv, 0xc5);
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if (fptlv != null) {
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ByteBuffer fpbuf = ByteBuffer.wrap(fptlv.mV);
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byte[] fp = new byte[20];
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fpbuf.get(fp);
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Log.d(Constants.TAG, "fingerprint 1: " + KeyFormattingUtils.convertFingerprintToHex(fp));
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fpbuf.get(fp);
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Log.d(Constants.TAG, "fingerprint 2: " + KeyFormattingUtils.convertFingerprintToHex(fp));
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fpbuf.get(fp);
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Log.d(Constants.TAG, "fingerprint 3: " + KeyFormattingUtils.convertFingerprintToHex(fp));
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}
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return "nope";
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}
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/**
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* Prints a message to the screen
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*
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* @param text the text which should be contained within the toast
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*/
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private void toast(String text) {
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Toast.makeText(this, text, Toast.LENGTH_LONG).show();
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}
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/**
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* Receive new NFC Intents to this activity only by enabling foreground dispatch.
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* This can only be done in onResume!
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*/
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public void enableNfcForegroundDispatch() {
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mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
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Intent nfcI = new Intent(this, NfcIntentActivity.class)
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.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP);
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PendingIntent nfcPendingIntent = PendingIntent.getActivity(this, 0, nfcI, 0);
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IntentFilter[] writeTagFilters = new IntentFilter[]{
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new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED)
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};
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// https://code.google.com/p/android/issues/detail?id=62918
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// maybe mNfcAdapter.enableReaderMode(); ?
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try {
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mNfcAdapter.enableForegroundDispatch(this, nfcPendingIntent, writeTagFilters, null);
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} catch (IllegalStateException e) {
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Log.i(Constants.TAG, "NfcForegroundDispatch Error!", e);
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}
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Log.d(Constants.TAG, "NfcForegroundDispatch has been enabled!");
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}
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/**
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* Disable foreground dispatch in onPause!
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*/
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public void disableNfcForegroundDispatch() {
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mNfcAdapter.disableForegroundDispatch(this);
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Log.d(Constants.TAG, "NfcForegroundDispatch has been disabled!");
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}
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/**
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* Gets the name of the user out of the raw card output regarding card holder related data
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*
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* @param name the raw card holder related data from the card
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* @return the name given in this data
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*/
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public static String getName(String name) {
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String slength;
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int ilength;
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name = name.substring(6);
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slength = name.substring(0, 2);
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ilength = Integer.parseInt(slength, 16) * 2;
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name = name.substring(2, ilength + 2);
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name = (new String(Hex.decode(name))).replace('<', ' ');
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return (name);
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}
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/**
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* Reduces the raw data from the card by four characters
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*
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* @param output the raw data from the card
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* @return the data field of that data
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*/
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private static String getDataField(String output) {
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return output.substring(0, output.length() - 4);
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}
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/**
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* Communicates with the OpenPgpCard via the APDU
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*
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* @param hex the hexadecimal APDU
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* @return The answer from the card
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* @throws java.io.IOException throws an exception if something goes wrong
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*/
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public static String card(IsoDep isoDep, String hex) throws IOException {
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return getHex(isoDep.transceive(Hex.decode(hex)));
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}
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/**
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* Converts a byte array into an hex string
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*
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* @param raw the byte array representation
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* @return the hexadecimal string representation
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*/
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public static String getHex(byte[] raw) {
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return new String(Hex.encode(raw));
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}
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}
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