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This commit is contained in:
Thomas 2023-01-05 18:53:49 +01:00
parent 9e701f82ba
commit 8fe26abec7
3 changed files with 276 additions and 24 deletions
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251
app/src/main/java/app/fedilab/android/helper/ECDHFedilab.java Normal file
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@ -0,0 +1,251 @@
package app.fedilab.android.helper;
/* Copyright 2022 Thomas Schneider
*
* This file is a part of Fedilab
*
* This program is free software; you can redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software Foundation; either version 3 of the
* License, or (at your option) any later version.
*
* Fedilab is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
* the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
* Public License for more details.
*
* You should have received a copy of the GNU General Public License along with Fedilab; if not,
* see <http://www.gnu.org/licenses>. */
import static app.fedilab.android.client.entities.app.StatusCache.restoreNotificationFromString;
import android.content.Context;
import android.content.SharedPreferences;
import android.util.Base64;
import android.util.Log;
import androidx.preference.PreferenceManager;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.Security;
import java.security.interfaces.ECPublicKey;
import java.security.spec.ECGenParameterSpec;
import java.security.spec.ECPoint;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Arrays;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyAgreement;
import javax.crypto.Mac;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.GCMParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import app.fedilab.android.client.entities.api.Notification;
public class ECDHFedilab {
public static final String kp_public = "kp_public";
public static final String peer_public = "peer_public";
public static final String name = "prime256v1";
private static final byte[] P256_HEAD = new byte[]{(byte) 0x30, (byte) 0x59, (byte) 0x30, (byte) 0x13, (byte) 0x06, (byte) 0x07, (byte) 0x2a,
(byte) 0x86, (byte) 0x48, (byte) 0xce, (byte) 0x3d, (byte) 0x02, (byte) 0x01, (byte) 0x06, (byte) 0x08, (byte) 0x2a, (byte) 0x86,
(byte) 0x48, (byte) 0xce, (byte) 0x3d, (byte) 0x03, (byte) 0x01, (byte) 0x07, (byte) 0x03, (byte) 0x42, (byte) 0x00};
static {
Security.addProvider(new org.spongycastle.jce.provider.BouncyCastleProvider());
}
private final KeyPairGenerator kpg;
private final PublicKey publicKey;
private final String encodedPublicKey;
private final byte[] authKey;
private final String slug;
private final String pushPublicKey;
private final String encodedAuthKey;
private final String pushAccountID;
private final String pushPrivateKey;
PrivateKey privateKey;
private String pushPrivateKe;
public ECDHFedilab(Context context, String slug) throws Exception {
if (slug == null) {
throw new Exception("slug cannot be null");
}
try {
kpg = KeyPairGenerator.getInstance("EC");
ECGenParameterSpec spec = new ECGenParameterSpec("prime256v1");
kpg.initialize(spec);
KeyPair keyPair = kpg.generateKeyPair();
publicKey = keyPair.getPublic();
privateKey = keyPair.getPrivate();
encodedPublicKey = Base64.encodeToString(serializeRawPublicKey(publicKey), Base64.URL_SAFE | Base64.NO_WRAP | Base64.NO_PADDING);
authKey = new byte[16];
SecureRandom secureRandom = new SecureRandom();
secureRandom.nextBytes(authKey);
byte[] randomAccountID = new byte[16];
secureRandom.nextBytes(randomAccountID);
pushPrivateKey = Base64.encodeToString(privateKey.getEncoded(), Base64.URL_SAFE | Base64.NO_WRAP | Base64.NO_PADDING);
pushPublicKey = Base64.encodeToString(publicKey.getEncoded(), Base64.URL_SAFE | Base64.NO_WRAP | Base64.NO_PADDING);
encodedAuthKey = Base64.encodeToString(authKey, Base64.URL_SAFE | Base64.NO_WRAP | Base64.NO_PADDING);
pushAccountID = Base64.encodeToString(randomAccountID, Base64.URL_SAFE | Base64.NO_WRAP | Base64.NO_PADDING);
SharedPreferences.Editor prefsEditor = PreferenceManager
.getDefaultSharedPreferences(context).edit();
prefsEditor.putString("pushPrivateKey" + slug, pushPrivateKey);
prefsEditor.putString("pushPublicKey" + slug, pushPublicKey);
prefsEditor.putString("encodedAuthKey" + slug, encodedAuthKey);
prefsEditor.putString("pushAccountID" + slug, pushAccountID);
prefsEditor.apply();
this.slug = slug;
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
public static String getServerKey(Context context, String slug) {
SharedPreferences sharedPreferences = PreferenceManager
.getDefaultSharedPreferences(context);
return sharedPreferences.getString("server_key" + slug, null);
}
private static byte[] serializeRawPublicKey(PublicKey key) {
ECPoint point = ((ECPublicKey) key).getW();
byte[] x = point.getAffineX().toByteArray();
byte[] y = point.getAffineY().toByteArray();
if (x.length > 32)
x = Arrays.copyOfRange(x, x.length - 32, x.length);
if (y.length > 32)
y = Arrays.copyOfRange(y, y.length - 32, y.length);
byte[] result = new byte[65];
result[0] = 4;
System.arraycopy(x, 0, result, 1 + (32 - x.length), x.length);
System.arraycopy(y, 0, result, result.length - y.length, y.length);
return result;
}
public static Notification decryptNotification(Context context, String slug, byte[] messageEncrypted) {
SharedPreferences sharedPreferences = PreferenceManager
.getDefaultSharedPreferences(context);
Log.v(Helper.TAG, ">>slug: " + slug);
String pushPrivateKey = sharedPreferences.getString("pushPrivateKey" + slug, null);
String pushPublicKey = sharedPreferences.getString("pushPublicKey" + slug, null);
String encodedAuthKey = sharedPreferences.getString("encodedAuthKey" + slug, null);
sharedPreferences.getString("pushAccountID" + slug, null);
Log.v(Helper.TAG, "getServerKey(context, slug): " + getServerKey(context, slug));
Log.v(Helper.TAG, "pushPrivateKey: " + pushPrivateKey);
Log.v(Helper.TAG, "pushPublicKey: " + pushPublicKey);
Log.v(Helper.TAG, "encodedAuthKey: " + encodedAuthKey);
PublicKey serverKey = null;
serverKey = deserializeRawPublicKey(Base64.decode(getServerKey(context, slug), Base64.URL_SAFE));
Log.v(Helper.TAG, "serverKey: " + serverKey);
PrivateKey privateKey;
PublicKey publicKey;
byte[] authKey;
try {
KeyFactory kf = KeyFactory.getInstance("EC");
privateKey = kf.generatePrivate(new PKCS8EncodedKeySpec(Base64.decode(pushPrivateKey, Base64.URL_SAFE)));
publicKey = kf.generatePublic(new X509EncodedKeySpec(Base64.decode(pushPublicKey, Base64.URL_SAFE)));
authKey = Base64.decode(encodedAuthKey, Base64.URL_SAFE);
} catch (NoSuchAlgorithmException | InvalidKeySpecException e) {
e.printStackTrace();
Log.v(Helper.TAG, "err1: " + e.getMessage());
return null;
}
byte[] sharedSecret;
try {
KeyAgreement keyAgreement = KeyAgreement.getInstance("ECDH");
keyAgreement.init(privateKey);
keyAgreement.doPhase(serverKey, true);
sharedSecret = keyAgreement.generateSecret();
} catch (NoSuchAlgorithmException | InvalidKeyException e) {
e.printStackTrace();
Log.v(Helper.TAG, "err2: " + e.getMessage());
return null;
}
byte[] secondSaltInfo = "Content-Encoding: auth\0".getBytes(StandardCharsets.UTF_8);
byte[] deriveKey;
try {
deriveKey = deriveKey(authKey, sharedSecret, secondSaltInfo, 32);
} catch (NoSuchAlgorithmException | InvalidKeyException e) {
e.printStackTrace();
Log.v(Helper.TAG, "err3: " + e.getMessage());
return null;
}
String decryptedStr;
try {
SecretKeySpec aesKey = new SecretKeySpec(deriveKey, "AES");
byte[] iv = Arrays.copyOfRange(messageEncrypted, 0, 12);
byte[] ciphertext = Arrays.copyOfRange(messageEncrypted, 12, messageEncrypted.length); // Separate ciphertext (the MAC is implicitly separated from the ciphertext)
Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
GCMParameterSpec gCMParameterSpec = new GCMParameterSpec(128, iv);
cipher.init(Cipher.DECRYPT_MODE, aesKey, gCMParameterSpec);
byte[] decrypted = cipher.doFinal(ciphertext);
decryptedStr = new String(decrypted, 2, decrypted.length - 2, StandardCharsets.UTF_8);
} catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidAlgorithmParameterException | InvalidKeyException | BadPaddingException | IllegalBlockSizeException e) {
e.printStackTrace();
Log.v(Helper.TAG, "err4: " + e.getMessage());
return null;
}
return restoreNotificationFromString(decryptedStr);
}
protected static PublicKey deserializeRawPublicKey(byte[] rawBytes) {
if (rawBytes.length != 65 && rawBytes.length != 64)
return null;
try {
KeyFactory kf = KeyFactory.getInstance("EC");
ByteArrayOutputStream os = new ByteArrayOutputStream();
os.write(P256_HEAD);
if (rawBytes.length == 64)
os.write(4);
os.write(rawBytes);
return kf.generatePublic(new X509EncodedKeySpec(os.toByteArray()));
} catch (NoSuchAlgorithmException | InvalidKeySpecException | IOException e) {
e.printStackTrace();
}
return null;
}
private static byte[] deriveKey(byte[] firstSalt, byte[] secondSalt, byte[] info, int length) throws NoSuchAlgorithmException, InvalidKeyException {
Mac hmacContext = Mac.getInstance("HmacSHA256");
hmacContext.init(new SecretKeySpec(firstSalt, "HmacSHA256"));
byte[] hmac = hmacContext.doFinal(secondSalt);
hmacContext.init(new SecretKeySpec(hmac, "HmacSHA256"));
hmacContext.update(info);
byte[] result = hmacContext.doFinal(new byte[]{1});
return result.length <= length ? result : Arrays.copyOfRange(result, 0, length);
}
public String getPublicKey() {
return this.encodedPublicKey;
}
public String getAuthKey() {
return this.encodedAuthKey;
}
}

35
app/src/main/java/app/fedilab/android/helper/PushNotifications.java
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@ -15,21 +15,17 @@ package app.fedilab.android.helper;
* see <http://www.gnu.org/licenses>. */
import static app.fedilab.android.helper.ECDH.kp_private;
import static app.fedilab.android.helper.ECDH.kp_public;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Handler;
import android.os.Looper;
import android.util.Log;
import androidx.annotation.NonNull;
import androidx.preference.PreferenceManager;
import java.util.Random;
import java.util.concurrent.TimeUnit;
import app.fedilab.android.BaseMainActivity;
import app.fedilab.android.R;
import app.fedilab.android.client.endpoints.MastodonNotificationsService;
import app.fedilab.android.client.entities.api.PushSubscription;
@ -50,24 +46,18 @@ public class PushNotifications {
SharedPreferences prefs = PreferenceManager
.getDefaultSharedPreferences(context);
String strPub = prefs.getString(kp_public + slug, "");
String strPriv = prefs.getString(kp_private + slug, "");
ECDH ecdh = null;
ECDHFedilab ecdh = null;
try {
ecdh = ECDH.getInstance(slug);
ecdh = new ECDHFedilab(context, slug);
} catch (Exception e) {
e.printStackTrace();
}
if (ecdh == null) {
return;
}
if (strPub.trim().isEmpty() || strPriv.trim().isEmpty()) {
ecdh.newPair(context);
}
String pubKey = ecdh.getPublicKey(context);
byte[] randBytes = new byte[16];
new Random().nextBytes(randBytes);
String auth = ECDH.base64Encode(randBytes);
String pubKey = ecdh.getPublicKey();
String auth = ecdh.getAuthKey();
boolean notif_follow = prefs.getBoolean(context.getString(R.string.SET_NOTIF_FOLLOW), true);
@ -75,8 +65,6 @@ public class PushNotifications {
boolean notif_share = prefs.getBoolean(context.getString(R.string.SET_NOTIF_SHARE), true);
boolean notif_poll = prefs.getBoolean(context.getString(R.string.SET_NOTIF_POLL), true);
boolean notif_fav = prefs.getBoolean(context.getString(R.string.SET_NOTIF_FAVOURITE), true);
MastodonNotificationsService mastodonNotificationsService = init(context, BaseMainActivity.currentInstance);
ECDH finalEcdh = ecdh;
new Thread(() -> {
String[] slugArray = slug.split("@");
BaseAccount accountDb = null;
@ -85,9 +73,11 @@ public class PushNotifications {
} catch (DBException e) {
e.printStackTrace();
}
if (accountDb == null) {
return;
}
MastodonNotificationsService mastodonNotificationsService = init(context, accountDb.instance);
PushSubscription pushSubscription;
Call<PushSubscription> pushSubscriptionCall = mastodonNotificationsService.pushSubscription(
accountDb.token,
@ -105,10 +95,16 @@ public class PushNotifications {
if (pushSubscriptionResponse.isSuccessful()) {
pushSubscription = pushSubscriptionResponse.body();
if (pushSubscription != null) {
finalEcdh.saveServerKey(context, pushSubscription.server_key);
pushSubscription.server_key = pushSubscription.server_key.replace('/', '_');
pushSubscription.server_key = pushSubscription.server_key.replace('+', '-');
SharedPreferences.Editor prefsEditor = PreferenceManager
.getDefaultSharedPreferences(context).edit();
prefsEditor.putString("server_key" + slug, pushSubscription.server_key);
prefsEditor.apply();
}
}
} catch (Exception e) {
Log.v(Helper.TAG, slug + " -> " + e.getMessage());
e.printStackTrace();
}
}
@ -122,6 +118,7 @@ public class PushNotifications {
}
public static String getToken(Context context, String slug) {
return context.getSharedPreferences("unifiedpush.connector", Context.MODE_PRIVATE).getString(
slug + "/unifiedpush.connector", null);

14
app/src/main/java/app/fedilab/android/services/CustomReceiver.java
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@ -16,6 +16,7 @@ package app.fedilab.android.services;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import androidx.annotation.NonNull;
@ -23,6 +24,7 @@ import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.unifiedpush.android.connector.MessagingReceiver;
import app.fedilab.android.helper.Helper;
import app.fedilab.android.helper.NotificationsHelper;
import app.fedilab.android.helper.PushNotifications;
@ -38,13 +40,15 @@ public class CustomReceiver extends MessagingReceiver {
@Override
public void onMessage(@NotNull Context context, @NotNull byte[] message, @NotNull String slug) {
// Called when a new message is received. The message contains the full POST body of the push message
Log.v(Helper.TAG, "onMessage: " + slug);
new Thread(() -> {
try {
/* ECDH ecdh = ECDH.getInstance(slug);
if (ecdh == null) {
return;
}*/
//String decrypted = ecdh.uncryptMessage(context, String.valueOf(message));
/*Notification notification = ECDHFedilab.decryptNotification(context, slug, message);
Log.v(Helper.TAG,"notification: " + notification);
if(notification != null) {
Log.v(Helper.TAG,"id: " + notification.id);
}
*/
NotificationsHelper.task(context, slug);
} catch (Exception e) {
e.printStackTrace();