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Fix for race conditioned caused by OkHttpClient NPE.

Browse Source 
We catch OkHttpClient exceptions to deal with bugs in their code,
but in some cases that was leaving our state information in a
bad situation.

// FREEBIE
This commit is contained in:
Moxie Marlinspike 2015-02-22 22:49:55 -08:00
parent 8a2caeef3d
commit 83d65228e9
4 changed files with 162 additions and 135 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
libtextsecure/src/main/java/org/whispersystems/textsecure/api/TextSecureMessagePipe.java
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@ -51,7 +51,7 @@ public class TextSecureMessagePipe {
}
}
public void shutdown() throws IOException {
public void shutdown() {
websocket.disconnect();
}

142
libtextsecure/src/main/java/org/whispersystems/textsecure/internal/websocket/OkHttpClientWrapper.java Normal file
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@ -0,0 +1,142 @@
package org.whispersystems.textsecure.internal.websocket;
import android.util.Log;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.Response;
import com.squareup.okhttp.internal.ws.WebSocket;
import com.squareup.okhttp.internal.ws.WebSocketListener;
import org.whispersystems.textsecure.api.push.TrustStore;
import org.whispersystems.textsecure.api.util.CredentialsProvider;
import org.whispersystems.textsecure.internal.util.BlacklistingTrustManager;
import org.whispersystems.textsecure.internal.util.Util;
import java.io.IOException;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.util.concurrent.TimeUnit;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import okio.Buffer;
import okio.BufferedSource;
public class OkHttpClientWrapper implements WebSocketListener {
private static final String TAG = OkHttpClientWrapper.class.getSimpleName();
private final String uri;
private final TrustStore trustStore;
private final CredentialsProvider credentialsProvider;
private final WebSocketEventListener listener;
private WebSocket webSocket;
private boolean closed;
private boolean connected;
public OkHttpClientWrapper(String uri, TrustStore trustStore,
CredentialsProvider credentialsProvider,
WebSocketEventListener listener)
{
Log.w(TAG, "Connecting to: " + uri);
this.uri = uri;
this.trustStore = trustStore;
this.credentialsProvider = credentialsProvider;
this.listener = listener;
}
public void connect() {
new Thread() {
@Override
public void run() {
int attempt = 0;
while ((webSocket = newSocket()) != null) {
try {
Response response = webSocket.connect(OkHttpClientWrapper.this);
if (response.code() == 101) {
synchronized (OkHttpClientWrapper.this) {
if (closed) webSocket.close(1000, "OK");
else connected = true;
}
listener.onConnected();
return;
}
Log.w(TAG, "WebSocket Response: " + response.code());
} catch (IOException e) {
Log.w(TAG, e);
}
Util.sleep(Math.min(++attempt * 200, TimeUnit.SECONDS.toMillis(15)));
}
}
}.start();
}
public synchronized void disconnect() {
Log.w(TAG, "Calling disconnect()...");
try {
closed = true;
if (webSocket != null && connected) {
webSocket.close(1000, "OK");
}
} catch (IOException e) {
Log.w(TAG, e);
}
}
public void sendMessage(byte[] message) throws IOException {
webSocket.sendMessage(WebSocket.PayloadType.BINARY, new Buffer().write(message));
}
@Override
public void onMessage(BufferedSource payload, WebSocket.PayloadType type) throws IOException {
Log.w(TAG, "onMessage: " + type);
if (type.equals(WebSocket.PayloadType.BINARY)) {
listener.onMessage(payload.readByteArray());
}
payload.close();
}
@Override
public void onClose(int code, String reason) {
Log.w(TAG, String.format("onClose(%d, %s)", code, reason));
listener.onClose();
}
@Override
public void onFailure(IOException e) {
Log.w(TAG, e);
listener.onClose();
}
private synchronized WebSocket newSocket() {
if (closed) return null;
String filledUri = String.format(uri, credentialsProvider.getUser(), credentialsProvider.getPassword());
SSLSocketFactory socketFactory = createTlsSocketFactory(trustStore);
return WebSocket.newWebSocket(new OkHttpClient().setSslSocketFactory(socketFactory),
new Request.Builder().url(filledUri).build());
}
private SSLSocketFactory createTlsSocketFactory(TrustStore trustStore) {
try {
SSLContext context = SSLContext.getInstance("TLS");
context.init(null, BlacklistingTrustManager.createFor(trustStore), null);
return context.getSocketFactory();
} catch (NoSuchAlgorithmException | KeyManagementException e) {
throw new AssertionError(e);
}
}
}

142
libtextsecure/src/main/java/org/whispersystems/textsecure/internal/websocket/WebSocketConnection.java
View File

@ -3,36 +3,22 @@ package org.whispersystems.textsecure.internal.websocket;
import android.util.Log;
import com.google.protobuf.InvalidProtocolBufferException;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.Response;
import com.squareup.okhttp.internal.ws.WebSocket;
import com.squareup.okhttp.internal.ws.WebSocketListener;
import org.whispersystems.textsecure.api.push.TrustStore;
import org.whispersystems.textsecure.api.util.CredentialsProvider;
import org.whispersystems.textsecure.internal.util.BlacklistingTrustManager;
import org.whispersystems.textsecure.internal.util.Util;
import java.io.IOException;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.util.LinkedList;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicBoolean;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import okio.Buffer;
import okio.BufferedSource;
import static org.whispersystems.textsecure.internal.websocket.WebSocketProtos.WebSocketMessage;
import static org.whispersystems.textsecure.internal.websocket.WebSocketProtos.WebSocketRequestMessage;
import static org.whispersystems.textsecure.internal.websocket.WebSocketProtos.WebSocketResponseMessage;
public class WebSocketConnection {
public class WebSocketConnection implements WebSocketEventListener {
private static final String TAG = WebSocketConnection.class.getSimpleName();
@ -42,7 +28,7 @@ public class WebSocketConnection {
private final TrustStore trustStore;
private final CredentialsProvider credentialsProvider;
private Client client;
private OkHttpClientWrapper client;
private KeepAliveSender keepAliveSender;
public WebSocketConnection(String httpUri, TrustStore trustStore, CredentialsProvider credentialsProvider) {
@ -56,12 +42,12 @@ public class WebSocketConnection {
Log.w(TAG, "WSC connect()...");
if (client == null) {
client = new Client(wsUri, trustStore, credentialsProvider);
client = new OkHttpClientWrapper(wsUri, trustStore, credentialsProvider, this);
client.connect();
}
}
public synchronized void disconnect() throws IOException {
public synchronized void disconnect() {
Log.w(TAG, "WSC disconnect()...");
if (client != null) {
@ -119,7 +105,7 @@ public class WebSocketConnection {
}
}
private synchronized void onMessage(byte[] payload) {
public synchronized void onMessage(byte[] payload) {
Log.w(TAG, "WSC onMessage()");
try {
WebSocketMessage message = WebSocketMessage.parseFrom(payload);
@ -136,10 +122,11 @@ public class WebSocketConnection {
}
}
private synchronized void onClose() {
public synchronized void onClose() {
Log.w(TAG, "onClose()...");
if (client != null) {
client.disconnect();
client = null;
connect();
}
@ -152,8 +139,8 @@ public class WebSocketConnection {
notifyAll();
}
private synchronized void onConnected() {
if (client != null) {
public synchronized void onConnected() {
if (client != null && keepAliveSender == null) {
keepAliveSender = new KeepAliveSender();
keepAliveSender.start();
}
@ -163,117 +150,6 @@ public class WebSocketConnection {
return System.currentTimeMillis() - startTime;
}
private class Client implements WebSocketListener {
private final String uri;
private final TrustStore trustStore;
private final CredentialsProvider credentialsProvider;
private WebSocket webSocket;
private boolean closed;
public Client(String uri, TrustStore trustStore, CredentialsProvider credentialsProvider) {
Log.w(TAG, "Connecting to: " + uri);
this.uri = uri;
this.trustStore = trustStore;
this.credentialsProvider = credentialsProvider;
}
public void connect() {
new Thread() {
@Override
public void run() {
int attempt = 0;
while (newSocket()) {
try {
Response response;
try {
response = webSocket.connect(Client.this);
} catch (IllegalStateException e) {
throw new IOException(e);
}
if (response.code() == 101) {
onConnected();
return;
}
Log.w(TAG, "WebSocket Response: " + response.code());
} catch (IOException e) {
Log.w(TAG, e);
}
Util.sleep(Math.min(++attempt * 200, TimeUnit.SECONDS.toMillis(15)));
}
}
}.start();
}
public synchronized void disconnect() {
Log.w(TAG, "Calling disconnect()...");
try {
closed = true;
if (webSocket != null) {
webSocket.close(1000, "OK");
}
} catch (IOException e) {
Log.w(TAG, e);
}
}
public void sendMessage(byte[] message) throws IOException {
webSocket.sendMessage(WebSocket.PayloadType.BINARY, new Buffer().write(message));
}
@Override
public void onMessage(BufferedSource payload, WebSocket.PayloadType type) throws IOException {
Log.w(TAG, "onMessage: " + type);
if (type.equals(WebSocket.PayloadType.BINARY)) {
WebSocketConnection.this.onMessage(payload.readByteArray());
}
payload.close();
}
@Override
public void onClose(int code, String reason) {
Log.w(TAG, String.format("onClose(%d, %s)", code, reason));
WebSocketConnection.this.onClose();
}
@Override
public void onFailure(IOException e) {
Log.w(TAG, e);
WebSocketConnection.this.onClose();
}
private synchronized boolean newSocket() {
if (closed) return false;
String filledUri = String.format(uri, credentialsProvider.getUser(), credentialsProvider.getPassword());
SSLSocketFactory socketFactory = createTlsSocketFactory(trustStore);
this.webSocket = WebSocket.newWebSocket(new OkHttpClient().setSslSocketFactory(socketFactory),
new Request.Builder().url(filledUri).build());
return true;
}
private SSLSocketFactory createTlsSocketFactory(TrustStore trustStore) {
try {
SSLContext context = SSLContext.getInstance("TLS");
context.init(null, BlacklistingTrustManager.createFor(trustStore), null);
return context.getSocketFactory();
} catch (NoSuchAlgorithmException | KeyManagementException e) {
throw new AssertionError(e);
}
}
}
private class KeepAliveSender extends Thread {
private AtomicBoolean stop = new AtomicBoolean(false);

9
libtextsecure/src/main/java/org/whispersystems/textsecure/internal/websocket/WebSocketEventListener.java Normal file
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@ -0,0 +1,9 @@
package org.whispersystems.textsecure.internal.websocket;
public interface WebSocketEventListener {
public void onMessage(byte[] payload);
public void onClose();
public void onConnected();
}