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Code Issues Releases Wiki Activity

Support HTTP(S) proxies (closes #232)

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This commit is contained in:
rfc2822 2014-05-07 22:53:22 +02:00
parent f69f449b44
commit 624f33c746
3 changed files with 74 additions and 38 deletions
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compile-libs/lombok.jar
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src/at/bitfire/davdroid/webdav/TlsSniSocketFactory.java
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@ -34,59 +34,95 @@ public class TlsSniSocketFactory implements LayeredConnectionSocketFactory {
final static TlsSniSocketFactory INSTANCE = new TlsSniSocketFactory(); final static TlsSniSocketFactory INSTANCE = new TlsSniSocketFactory();
private final static SSLCertificateSocketFactory sslSocketFactory = (SSLCertificateSocketFactory)SSLCertificateSocketFactory.getDefault(0); private final static SSLCertificateSocketFactory sslSocketFactory =
(SSLCertificateSocketFactory)SSLCertificateSocketFactory.getDefault(0);
private final static HostnameVerifier hostnameVerifier = new BrowserCompatHostnameVerifier(); private final static HostnameVerifier hostnameVerifier = new BrowserCompatHostnameVerifier();
/*
For SSL connections without HTTP(S) proxy:
1) createSocket() is called
2) connectSocket() is called which creates a new SSL connection
2a) SNI is set up, and then
2b) the connection is established, hands are shaken and certificate/host name are verified
Layered sockets are used with HTTP(S) proxies:
1) a new plain socket is created by the HTTP library
2) the plain socket is connected to http://proxy:8080
3) a CONNECT request is sent to the proxy and the response is parsed
4) now, createLayeredSocket() is called which wraps an SSL socket around the proxy connection,
doing all the set-up and verfication
4a) Because SSLSocket.createSocket(socket, ...) always does a handshake without allowing
to set up SNI before, *** SNI is not available for layered connections *** (unless
active by Android's defaults, which it isn't at the moment).
*/
@Override @Override
public Socket createSocket(HttpContext context) throws IOException { public Socket createSocket(HttpContext context) throws IOException {
return sslSocketFactory.createSocket(); return new Socket();
} }
@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
@Override @Override
public Socket connectSocket(int timeout, Socket socket, HttpHost host, InetSocketAddress remoteAddr, InetSocketAddress localAddr, HttpContext context) throws IOException { public Socket connectSocket(int timeout, Socket plain, HttpHost host, InetSocketAddress remoteAddr, InetSocketAddress localAddr, HttpContext context) throws IOException {
// we'll rather create a new socket Log.d(TAG, "Preparing direct SSL connection (without proxy) to " + host);
socket.close();
// create and connect SSL socket, but don't do hostname/certificate verification yet // we'll rather use an SSLSocket directly
plain.close();
// create a plain SSL socket, but don't do hostname/certificate verification yet
SSLSocket ssl = (SSLSocket)sslSocketFactory.createSocket(remoteAddr.getAddress(), host.getPort()); SSLSocket ssl = (SSLSocket)sslSocketFactory.createSocket(remoteAddr.getAddress(), host.getPort());
// set reasonable SSL/TLS settings before the handshake: // connect, set SNI, shake hands, verify, print connection info
// - enable all supported protocols (enables TLSv1.1 and TLSv1.2 on Android <4.4.3, if available) connectWithSNI(ssl, host.getHostName());
ssl.setEnabledProtocols(ssl.getSupportedProtocols());
// - set SNI host name
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
sslSocketFactory.setHostname(ssl, host.getHostName());
// TODO sslSocketFactory.setUseSessionTickets(ssl, true);
} else {
Log.d(TAG, "No documented SNI support on Android <4.2, trying with reflection");
try {
java.lang.reflect.Method setHostnameMethod = ssl.getClass().getMethod("setHostname", String.class);
setHostnameMethod.invoke(ssl, host.getHostName());
} catch (Exception e) {
Log.w(TAG, "SNI not useable", e);
}
}
// verify hostname and certificate
SSLSession session = ssl.getSession();
if (!hostnameVerifier.verify(host.getHostName(), session))
throw new SSLPeerUnverifiedException("Cannot verify hostname: " + host);
Log.i(TAG, "Established " + session.getProtocol() + " connection with " + session.getPeerHost() +
" using " + session.getCipherSuite());
return ssl; return ssl;
} }
// TLS layer
@Override @Override
public Socket createLayeredSocket(Socket plainSocket, String host, int port, HttpContext context) throws IOException, UnknownHostException { public Socket createLayeredSocket(Socket plain, String host, int port, HttpContext context) throws IOException, UnknownHostException {
Log.wtf(TAG, "createLayeredSocket should never be called"); Log.d(TAG, "Preparing layered SSL connection (over proxy) to " + host);
return plainSocket;
// create a layered SSL socket, but don't do hostname/certificate verification yet
SSLSocket ssl = (SSLSocket)sslSocketFactory.createSocket(plain, host, port, true);
// already connected, but verify host name again and print some connection info
connectWithSNI(ssl, host);
return ssl;
} }
@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
private void connectWithSNI(SSLSocket ssl, String host) throws SSLPeerUnverifiedException {
if (!ssl.isConnected()) {
// set reasonable SSL/TLS settings before the handshake:
// - enable all supported protocols (enables TLSv1.1 and TLSv1.2 on Android <4.4.3, if available)
ssl.setEnabledProtocols(ssl.getSupportedProtocols());
// - set SNI host name
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
Log.d(TAG, "Using documented SNI with host name " + host);
sslSocketFactory.setHostname(ssl, host);
} else {
Log.d(TAG, "No documented SNI support on Android <4.2, trying with reflection");
try {
java.lang.reflect.Method setHostnameMethod = ssl.getClass().getMethod("setHostname", String.class);
setHostnameMethod.invoke(ssl, host);
} catch (Exception e) {
Log.w(TAG, "SNI not useable", e);
}
}
} else
Log.d(TAG, "Socket is already connected, SNI/TLv1.2 not available unless activated by Android defaults");
// verify hostname and certificate
SSLSession session = ssl.getSession();
if (!hostnameVerifier.verify(host, session))
throw new SSLPeerUnverifiedException("Cannot verify hostname: " + host);
Log.i(TAG, "Established " + session.getProtocol() + " connection with " + session.getPeerHost() +
" using " + session.getCipherSuite());
}
} }