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explicitly use BouncyCastle for file crypto

This commit is contained in:
Daniel Gultsch 2020-03-09 19:12:30 +01:00
parent 257de4b51e
commit 00191e2b60
5 changed files with 24 additions and 37 deletions
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4
build.gradle
View File

@ -54,7 +54,7 @@ dependencies {
compatImplementation "com.android.support:support-emoji-appcompat:$supportLibVersion"
conversationsFreeCompatImplementation "com.android.support:support-emoji-bundled:$supportLibVersion"
quicksyFreeCompatImplementation "com.android.support:support-emoji-bundled:$supportLibVersion"
implementation 'org.bouncycastle:bcmail-jdk15on:1.58'
implementation 'org.bouncycastle:bcmail-jdk15on:1.64'
//zxing stopped supporting Java 7 so we have to stick with 3.3.3
//https://github.com/zxing/zxing/issues/1170
implementation 'com.google.zxing:core:3.3.3'
@ -90,7 +90,7 @@ android {
defaultConfig {
minSdkVersion 16
targetSdkVersion 28
versionCode 365
versionCode 366
versionName "2.7.1"
archivesBaseName += "-$versionName"
applicationId "eu.siacs.conversations"

6
src/main/java/eu/siacs/conversations/crypto/axolotl/AxolotlService.java
View File

@ -1157,7 +1157,7 @@ public class AxolotlService implements OnAdvancedStreamFeaturesLoaded {
@Nullable
public XmppAxolotlMessage encrypt(Message message) {
final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(account.getJid().asBareJid(), getOwnDeviceId(), true);
final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(account.getJid().asBareJid(), getOwnDeviceId());
final String content;
if (message.hasFileOnRemoteHost()) {
content = message.getFileParams().url.toString();
@ -1201,7 +1201,7 @@ public class AxolotlService implements OnAdvancedStreamFeaturesLoaded {
executor.execute(new Runnable() {
@Override
public void run() {
final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(account.getJid().asBareJid(), getOwnDeviceId(), false);
final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(account.getJid().asBareJid(), getOwnDeviceId());
if (buildHeader(axolotlMessage, conversation)) {
onMessageCreatedCallback.run(axolotlMessage);
} else {
@ -1362,7 +1362,7 @@ public class AxolotlService implements OnAdvancedStreamFeaturesLoaded {
}
private void completeSession(XmppAxolotlSession session) {
final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(account.getJid().asBareJid(), getOwnDeviceId(), true);
final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(account.getJid().asBareJid(), getOwnDeviceId());
axolotlMessage.addDevice(session, true);
try {
final Jid jid = Jid.of(session.getRemoteAddress().getName());

8
src/main/java/eu/siacs/conversations/crypto/axolotl/XmppAxolotlMessage.java
View File

@ -85,11 +85,11 @@ public class XmppAxolotlMessage {
}
}
XmppAxolotlMessage(Jid from, int sourceDeviceId, final boolean twelveByteIv) {
XmppAxolotlMessage(Jid from, int sourceDeviceId) {
this.from = from;
this.sourceDeviceId = sourceDeviceId;
this.keys = new ArrayList<>();
this.iv = generateIv(twelveByteIv);
this.iv = generateIv();
this.innerKey = generateKey();
}
@ -119,9 +119,9 @@ public class XmppAxolotlMessage {
}
}
private static byte[] generateIv(final boolean twelveByteIv) {
private static byte[] generateIv() {
final SecureRandom random = new SecureRandom();
byte[] iv = new byte[twelveByteIv ? 12 : 16];
final byte[] iv = new byte[12];
random.nextBytes(iv);
return iv;
}

10
src/main/java/eu/siacs/conversations/http/HttpUploadConnection.java
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@ -110,15 +110,7 @@ public class HttpUploadConnection implements Transferable {
if (Config.ENCRYPT_ON_HTTP_UPLOADED
|| message.getEncryption() == Message.ENCRYPTION_AXOLOTL
|| message.getEncryption() == Message.ENCRYPTION_OTR) {
//ok, this is going to sound super crazy but on Android 9+ a 12 byte IV will use the
//internal conscrypt library (provided by the OS) instead of bounce castle, while 16 bytes
//will still 'fallback' to bounce castle even on Android 9+ because conscrypt doesnt
//have support for anything but 12.
//For large files conscrypt has extremely bad performance; so why not always use 16 you ask?
//well the ecosystem was moving and some clients like Monal *only* support 12
//so the result of this code is that we can only send 'small' files to Monal.
//'small' was relatively arbitrarily choose and correlates to roughly 'small' compressed images
this.key = new byte[originalFileSize <= 786432 ? 44 : 48];
this.key = new byte[44];
mXmppConnectionService.getRNG().nextBytes(this.key);
this.file.setKeyAndIv(this.key);
}

29
src/main/java/eu/siacs/conversations/services/AbstractConnectionManager.java
View File

@ -5,6 +5,14 @@ import android.os.PowerManager;
import android.os.SystemClock;
import android.util.Log;
import org.bouncycastle.crypto.engines.AESEngine;
import org.bouncycastle.crypto.io.CipherInputStream;
import org.bouncycastle.crypto.io.CipherOutputStream;
import org.bouncycastle.crypto.modes.AEADBlockCipher;
import org.bouncycastle.crypto.modes.GCMBlockCipher;
import org.bouncycastle.crypto.params.AEADParameters;
import org.bouncycastle.crypto.params.KeyParameter;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
@ -15,24 +23,15 @@ import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.util.concurrent.atomic.AtomicLong;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import eu.siacs.conversations.Config;
import eu.siacs.conversations.R;
import eu.siacs.conversations.entities.DownloadableFile;
import eu.siacs.conversations.utils.Compatibility;
import eu.siacs.conversations.utils.CryptoHelper;
public class AbstractConnectionManager {
private static final String KEYTYPE = "AES";
private static final String CIPHERMODE = "AES/GCM/NoPadding";
private static final String PROVIDER = "BC";
private static final int UI_REFRESH_THRESHOLD = 250;
private static final AtomicLong LAST_UI_UPDATE_CALL = new AtomicLong(0);
protected XmppConnectionService mXmppConnectionService;
@ -43,10 +42,8 @@ public class AbstractConnectionManager {
public static InputStream upgrade(DownloadableFile file, InputStream is) throws InvalidAlgorithmParameterException, NoSuchAlgorithmException, InvalidKeyException, NoSuchPaddingException, NoSuchProviderException {
if (file.getKey() != null && file.getIv() != null) {
final Cipher cipher = Compatibility.twentyEight() ? Cipher.getInstance(CIPHERMODE) : Cipher.getInstance(CIPHERMODE, PROVIDER);
SecretKeySpec keySpec = new SecretKeySpec(file.getKey(), KEYTYPE);
IvParameterSpec ivSpec = new IvParameterSpec(file.getIv());
cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);
AEADBlockCipher cipher = new GCMBlockCipher(new AESEngine());
cipher.init(true, new AEADParameters(new KeyParameter(file.getKey()), 128, file.getIv()));
return new CipherInputStream(is, cipher);
} else {
return is;
@ -65,10 +62,8 @@ public class AbstractConnectionManager {
return null;
}
try {
final Cipher cipher = Compatibility.twentyEight() ? Cipher.getInstance(CIPHERMODE) : Cipher.getInstance(CIPHERMODE, PROVIDER);
SecretKeySpec keySpec = new SecretKeySpec(file.getKey(), KEYTYPE);
IvParameterSpec ivSpec = new IvParameterSpec(file.getIv());
cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
AEADBlockCipher cipher = new GCMBlockCipher(new AESEngine());
cipher.init(false, new AEADParameters(new KeyParameter(file.getKey()), 128, file.getIv()));
return new CipherOutputStream(os, cipher);
} catch (Exception e) {
Log.d(Config.LOGTAG, "unable to create cipher output stream", e);