Server POW (work in progress)
This commit is contained in:
parent
73383aa2c2
commit
b0828ec1e5
@ -0,0 +1,84 @@
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package ch.dissem.apps.abit.adapter;
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import android.content.Context;
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import android.content.SharedPreferences;
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import android.preference.PreferenceManager;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import ch.dissem.apps.abit.util.PRNGFixes;
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import ch.dissem.bitmessage.entity.BitmessageAddress;
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import ch.dissem.bitmessage.entity.ObjectMessage;
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import ch.dissem.bitmessage.entity.Plaintext;
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import ch.dissem.bitmessage.entity.PlaintextHolder;
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import ch.dissem.bitmessage.entity.payload.Broadcast;
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import ch.dissem.bitmessage.entity.valueobject.Label;
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import ch.dissem.bitmessage.factory.Factory;
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import ch.dissem.bitmessage.ports.ProofOfWorkEngine;
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import ch.dissem.bitmessage.security.sc.SpongySecurity;
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import ch.dissem.bitmessage.utils.UnixTime;
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import static ch.dissem.apps.abit.util.Constants.PREFERENCE_SERVER_POW;
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import static ch.dissem.bitmessage.entity.Plaintext.Status.SENT;
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import static ch.dissem.bitmessage.entity.Plaintext.Type.BROADCAST;
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import static ch.dissem.bitmessage.utils.UnixTime.DAY;
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/**
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* @author Christian Basler
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*/
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public class AndroidSecurity extends SpongySecurity {
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private final SharedPreferences preferences;
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public AndroidSecurity(Context ctx) {
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PRNGFixes.apply();
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preferences = PreferenceManager.getDefaultSharedPreferences(ctx);
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}
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@Override
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public void doProofOfWork(ObjectMessage object, long nonceTrialsPerByte, long extraBytes, ProofOfWorkEngine.Callback callback) {
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if (preferences.getBoolean(PREFERENCE_SERVER_POW, false)) {
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object.setNonce(new byte[8]);
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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try {
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object.write(out);
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sendAsBroadcast(getContext().getAddressRepo().getIdentities().get(0), out.toByteArray());
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if (object.getPayload() instanceof PlaintextHolder) {
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Plaintext plaintext = ((PlaintextHolder) object.getPayload()).getPlaintext();
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plaintext.setInventoryVector(object.getInventoryVector());
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plaintext.setStatus(SENT);
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plaintext.removeLabel(Label.Type.OUTBOX);
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plaintext.addLabels(getContext().getMessageRepository().getLabels(Label.Type.SENT));
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getContext().getMessageRepository().save(plaintext);
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}
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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} else {
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super.doProofOfWork(object, nonceTrialsPerByte, extraBytes, callback);
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}
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}
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private void sendAsBroadcast(BitmessageAddress identity, byte[] data) throws IOException {
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Plaintext msg = new Plaintext.Builder(BROADCAST)
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.from(identity)
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.message(data)
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.build();
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Broadcast payload = Factory.getBroadcast(identity, msg);
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long expires = UnixTime.now(+2 * DAY);
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final ObjectMessage object = new ObjectMessage.Builder()
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.stream(identity.getStream())
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.expiresTime(expires)
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.payload(payload)
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.build();
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object.sign(identity.getPrivateKey());
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payload.encrypt();
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object.setNonce(new byte[8]);
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getContext().getInventory().storeObject(object);
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getContext().getNetworkHandler().offer(object.getInventoryVector());
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// TODO: offer to the trusted node only?
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// at least make sure it is offered to the trusted node!
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}
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}
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@ -2,6 +2,7 @@ package ch.dissem.apps.abit.service;
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import android.content.Context;
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import ch.dissem.apps.abit.adapter.AndroidSecurity;
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import ch.dissem.apps.abit.listener.MessageListener;
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import ch.dissem.apps.abit.repository.AndroidAddressRepository;
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import ch.dissem.apps.abit.repository.AndroidInventory;
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@ -30,7 +31,7 @@ public class Singleton {
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SqlHelper sqlHelper = new SqlHelper(ctx);
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bitmessageContext = new BitmessageContext.Builder()
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.proofOfWorkEngine(new ServicePowEngine(ctx))
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.security(new SpongySecurity())
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.security(new AndroidSecurity(ctx))
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.nodeRegistry(new MemoryNodeRegistry())
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.inventory(new AndroidInventory(sqlHelper))
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.addressRepo(new AndroidAddressRepository(sqlHelper))
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@ -20,6 +20,9 @@ import ch.dissem.apps.abit.notification.ErrorNotification;
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import ch.dissem.apps.abit.service.Singleton;
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import ch.dissem.bitmessage.BitmessageContext;
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import static ch.dissem.apps.abit.util.Constants.PREFERENCE_SYNC_TIMEOUT;
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import static ch.dissem.apps.abit.util.Constants.PREFERENCE_TRUSTED_NODE;
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/**
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* Sync Adapter to synchronize with the Bitmessage network - fetches
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* new objects and then disconnects.
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@ -48,7 +51,7 @@ public class SyncAdapter extends AbstractThreadedSyncAdapter {
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SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(getContext());
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String trustedNode = preferences.getString("trusted_node", null);
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String trustedNode = preferences.getString(PREFERENCE_TRUSTED_NODE, null);
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if (trustedNode == null) return;
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trustedNode = trustedNode.trim();
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if (trustedNode.isEmpty()) return;
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@ -69,7 +72,7 @@ public class SyncAdapter extends AbstractThreadedSyncAdapter {
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} else {
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port = 8444;
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}
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long timeoutInSeconds = Long.parseLong(preferences.getString("sync_timeout", "120"));
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long timeoutInSeconds = Long.parseLong(preferences.getString(PREFERENCE_SYNC_TIMEOUT, "120"));
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try {
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LOG.info("Synchronization started");
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bmc.synchronize(InetAddress.getByName(trustedNode), port, timeoutInSeconds, true);
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@ -3,9 +3,14 @@ package ch.dissem.apps.abit.util;
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import java.util.regex.Pattern;
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/**
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* Created by chrigu on 16.11.15.
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* @author Christian Basler
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*/
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public class Constants {
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public static final String PREFERENCE_WIFI_ONLY = "wifi_only";
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public static final String PREFERENCE_TRUSTED_NODE = "trusted_node";
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public static final String PREFERENCE_SYNC_TIMEOUT = "sync_timeout";
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public static final String PREFERENCE_SERVER_POW = "server_pow";
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public static final String BITMESSAGE_URL_SCHEMA = "bitmessage:";
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public static final Pattern BITMESSAGE_ADDRESS_PATTERN = Pattern.compile("\\bBM-[a-zA-Z0-9]+\\b");
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}
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341
app/src/main/java/ch/dissem/apps/abit/util/PRNGFixes.java
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341
app/src/main/java/ch/dissem/apps/abit/util/PRNGFixes.java
Normal file
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package ch.dissem.apps.abit.util;
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/*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will Google be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, as long as the origin is not misrepresented.
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*/
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import android.os.Build;
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import android.os.Process;
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import android.util.Log;
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import java.io.ByteArrayOutputStream;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.io.UnsupportedEncodingException;
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import java.security.NoSuchAlgorithmException;
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import java.security.Provider;
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import java.security.SecureRandom;
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import java.security.SecureRandomSpi;
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import java.security.Security;
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/**
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* Fixes for the output of the default PRNG having low entropy.
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* <p/>
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* The fixes need to be applied via {@link #apply()} before any use of Java
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* Cryptography Architecture primitives. A good place to invoke them is in the
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* application's {@code onCreate}.
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*
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* @see <a href="http://android-developers.blogspot.ch/2013/08/some-securerandom-thoughts.html">
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* http://android-developers.blogspot.ch/2013/08/some-securerandom-thoughts.html</a>
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*/
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public final class PRNGFixes {
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private static final int VERSION_CODE_JELLY_BEAN = 16;
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private static final int VERSION_CODE_JELLY_BEAN_MR2 = 18;
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private static final byte[] BUILD_FINGERPRINT_AND_DEVICE_SERIAL =
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getBuildFingerprintAndDeviceSerial();
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/**
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* Hidden constructor to prevent instantiation.
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*/
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private PRNGFixes() {
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}
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/**
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* Applies all fixes.
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*
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* @throws SecurityException if a fix is needed but could not be applied.
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*/
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public static void apply() {
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applyOpenSSLFix();
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installLinuxPRNGSecureRandom();
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}
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/**
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* Applies the fix for OpenSSL PRNG having low entropy. Does nothing if the
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* fix is not needed.
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*
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* @throws SecurityException if the fix is needed but could not be applied.
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*/
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private static void applyOpenSSLFix() throws SecurityException {
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if ((Build.VERSION.SDK_INT < VERSION_CODE_JELLY_BEAN)
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|| (Build.VERSION.SDK_INT > VERSION_CODE_JELLY_BEAN_MR2)) {
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// No need to apply the fix
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return;
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}
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try {
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// Mix in the device- and invocation-specific seed.
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Class.forName("org.apache.harmony.xnet.provider.jsse.NativeCrypto")
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.getMethod("RAND_seed", byte[].class)
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.invoke(null, generateSeed());
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// Mix output of Linux PRNG into OpenSSL's PRNG
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int bytesRead = (Integer) Class.forName(
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"org.apache.harmony.xnet.provider.jsse.NativeCrypto")
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.getMethod("RAND_load_file", String.class, long.class)
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.invoke(null, "/dev/urandom", 1024);
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if (bytesRead != 1024) {
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throw new IOException(
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"Unexpected number of bytes read from Linux PRNG: "
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+ bytesRead);
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}
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} catch (Exception e) {
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throw new SecurityException("Failed to seed OpenSSL PRNG", e);
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}
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}
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/**
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* Installs a Linux PRNG-backed {@code SecureRandom} implementation as the
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* default. Does nothing if the implementation is already the default or if
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* there is not need to install the implementation.
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*
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* @throws SecurityException if the fix is needed but could not be applied.
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*/
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private static void installLinuxPRNGSecureRandom()
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throws SecurityException {
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if (Build.VERSION.SDK_INT > VERSION_CODE_JELLY_BEAN_MR2) {
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// No need to apply the fix
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return;
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}
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// Install a Linux PRNG-based SecureRandom implementation as the
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// default, if not yet installed.
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Provider[] secureRandomProviders =
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Security.getProviders("SecureRandom.SHA1PRNG");
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if ((secureRandomProviders == null)
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|| (secureRandomProviders.length < 1)
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|| (!LinuxPRNGSecureRandomProvider.class.equals(
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secureRandomProviders[0].getClass()))) {
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Security.insertProviderAt(new LinuxPRNGSecureRandomProvider(), 1);
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}
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// Assert that new SecureRandom() and
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// SecureRandom.getInstance("SHA1PRNG") return a SecureRandom backed
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// by the Linux PRNG-based SecureRandom implementation.
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SecureRandom rng1 = new SecureRandom();
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if (!LinuxPRNGSecureRandomProvider.class.equals(
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rng1.getProvider().getClass())) {
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throw new SecurityException(
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"new SecureRandom() backed by wrong Provider: "
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+ rng1.getProvider().getClass());
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}
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SecureRandom rng2;
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try {
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rng2 = SecureRandom.getInstance("SHA1PRNG");
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} catch (NoSuchAlgorithmException e) {
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throw new SecurityException("SHA1PRNG not available", e);
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}
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if (!LinuxPRNGSecureRandomProvider.class.equals(
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rng2.getProvider().getClass())) {
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throw new SecurityException(
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"SecureRandom.getInstance(\"SHA1PRNG\") backed by wrong"
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+ " Provider: " + rng2.getProvider().getClass());
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}
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}
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/**
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* {@code Provider} of {@code SecureRandom} engines which pass through
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* all requests to the Linux PRNG.
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*/
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private static class LinuxPRNGSecureRandomProvider extends Provider {
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public LinuxPRNGSecureRandomProvider() {
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super("LinuxPRNG",
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1.0,
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"A Linux-specific random number provider that uses"
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+ " /dev/urandom");
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// Although /dev/urandom is not a SHA-1 PRNG, some apps
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// explicitly request a SHA1PRNG SecureRandom and we thus need to
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// prevent them from getting the default implementation whose output
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// may have low entropy.
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put("SecureRandom.SHA1PRNG", LinuxPRNGSecureRandom.class.getName());
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put("SecureRandom.SHA1PRNG ImplementedIn", "Software");
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}
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}
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/**
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* {@link SecureRandomSpi} which passes all requests to the Linux PRNG
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* ({@code /dev/urandom}).
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*/
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public static class LinuxPRNGSecureRandom extends SecureRandomSpi {
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/*
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* IMPLEMENTATION NOTE: Requests to generate bytes and to mix in a seed
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* are passed through to the Linux PRNG (/dev/urandom). Instances of
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* this class seed themselves by mixing in the current time, PID, UID,
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* build fingerprint, and hardware serial number (where available) into
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* Linux PRNG.
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*
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* Concurrency: Read requests to the underlying Linux PRNG are
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* serialized (on sLock) to ensure that multiple threads do not get
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* duplicated PRNG output.
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*/
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private static final File URANDOM_FILE = new File("/dev/urandom");
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private static final Object sLock = new Object();
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/**
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* Input stream for reading from Linux PRNG or {@code null} if not yet
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* opened.
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*
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* @GuardedBy("sLock")
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*/
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private static DataInputStream sUrandomIn;
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/**
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* Output stream for writing to Linux PRNG or {@code null} if not yet
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* opened.
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*
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* @GuardedBy("sLock")
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*/
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private static OutputStream sUrandomOut;
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/**
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* Whether this engine instance has been seeded. This is needed because
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* each instance needs to seed itself if the client does not explicitly
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* seed it.
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*/
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private boolean mSeeded;
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@Override
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protected void engineSetSeed(byte[] bytes) {
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try {
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OutputStream out;
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synchronized (sLock) {
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out = getUrandomOutputStream();
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}
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out.write(bytes);
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out.flush();
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} catch (IOException e) {
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// On a small fraction of devices /dev/urandom is not writable.
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// Log and ignore.
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Log.w(PRNGFixes.class.getSimpleName(),
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"Failed to mix seed into " + URANDOM_FILE);
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} finally {
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mSeeded = true;
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}
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}
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@Override
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protected void engineNextBytes(byte[] bytes) {
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if (!mSeeded) {
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// Mix in the device- and invocation-specific seed.
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engineSetSeed(generateSeed());
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}
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try {
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DataInputStream in;
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synchronized (sLock) {
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in = getUrandomInputStream();
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}
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synchronized (in) {
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in.readFully(bytes);
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}
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} catch (IOException e) {
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throw new SecurityException(
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"Failed to read from " + URANDOM_FILE, e);
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}
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}
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@Override
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protected byte[] engineGenerateSeed(int size) {
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byte[] seed = new byte[size];
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engineNextBytes(seed);
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return seed;
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}
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private DataInputStream getUrandomInputStream() {
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synchronized (sLock) {
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if (sUrandomIn == null) {
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// NOTE: Consider inserting a BufferedInputStream between
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// DataInputStream and FileInputStream if you need higher
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// PRNG output performance and can live with future PRNG
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// output being pulled into this process prematurely.
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try {
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sUrandomIn = new DataInputStream(
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new FileInputStream(URANDOM_FILE));
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} catch (IOException e) {
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throw new SecurityException("Failed to open "
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+ URANDOM_FILE + " for reading", e);
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}
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}
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return sUrandomIn;
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}
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}
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private OutputStream getUrandomOutputStream() throws IOException {
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synchronized (sLock) {
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if (sUrandomOut == null) {
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sUrandomOut = new FileOutputStream(URANDOM_FILE);
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}
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return sUrandomOut;
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}
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}
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}
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/**
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* Generates a device- and invocation-specific seed to be mixed into the
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* Linux PRNG.
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*/
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private static byte[] generateSeed() {
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try {
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ByteArrayOutputStream seedBuffer = new ByteArrayOutputStream();
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DataOutputStream seedBufferOut =
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new DataOutputStream(seedBuffer);
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seedBufferOut.writeLong(System.currentTimeMillis());
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seedBufferOut.writeLong(System.nanoTime());
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seedBufferOut.writeInt(Process.myPid());
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seedBufferOut.writeInt(Process.myUid());
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seedBufferOut.write(BUILD_FINGERPRINT_AND_DEVICE_SERIAL);
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seedBufferOut.close();
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return seedBuffer.toByteArray();
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} catch (IOException e) {
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throw new SecurityException("Failed to generate seed", e);
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}
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}
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/**
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* Gets the hardware serial number of this device.
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*
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* @return serial number or {@code null} if not available.
|
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*/
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private static String getDeviceSerialNumber() {
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// We're using the Reflection API because Build.SERIAL is only available
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// since API Level 9 (Gingerbread, Android 2.3).
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try {
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return (String) Build.class.getField("SERIAL").get(null);
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} catch (Exception ignored) {
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
private static byte[] getBuildFingerprintAndDeviceSerial() {
|
||||
StringBuilder result = new StringBuilder();
|
||||
String fingerprint = Build.FINGERPRINT;
|
||||
if (fingerprint != null) {
|
||||
result.append(fingerprint);
|
||||
}
|
||||
String serial = getDeviceSerialNumber();
|
||||
if (serial != null) {
|
||||
result.append(serial);
|
||||
}
|
||||
try {
|
||||
return result.toString().getBytes("UTF-8");
|
||||
} catch (UnsupportedEncodingException e) {
|
||||
throw new RuntimeException("UTF-8 encoding not supported");
|
||||
}
|
||||
}
|
||||
}
|
@ -49,4 +49,6 @@
|
||||
<string name="compose_body_hint">Nachricht schreiben</string>
|
||||
<string name="contacts_and_subscriptions">Kontakte</string>
|
||||
<string name="subscribed">Abonniert</string>
|
||||
<string name="server_pow">Server POW</string>
|
||||
<string name="server_pow_summary">Der vertrauenswürdige Knoten macht den Proof of Work</string>
|
||||
</resources>
|
@ -49,4 +49,6 @@
|
||||
<string name="compose_body_hint">Write message</string>
|
||||
<string name="contacts_and_subscriptions">Contacts</string>
|
||||
<string name="subscribed">Subscribed</string>
|
||||
<string name="server_pow">Server POW</string>
|
||||
<string name="server_pow_summary">Trusted node does proof of work</string>
|
||||
</resources>
|
||||
|
@ -24,4 +24,11 @@
|
||||
android:key="sync_timeout"
|
||||
android:summary="@string/sync_timeout_summary"
|
||||
android:title="@string/sync_timeout" />
|
||||
<SwitchPreference
|
||||
android:defaultValue="false"
|
||||
android:key="server_pow"
|
||||
android:dependency="@string/trusted_node"
|
||||
android:title="@string/server_pow"
|
||||
android:summary="@string/server_pow_summary"
|
||||
/>
|
||||
</PreferenceScreen>
|
Loading…
Reference in New Issue
Block a user