SMACK-376 Allow supplying a custom SSLContext for encrypted connections.

The provided TrustManager / SSLContext implementation is very flexible,
but it does not allow to query the user about accepting possibly
invalid SSL certificates. By supplying a custom SSLContext with a
TrustManager implementing such a query mechanism it is possible to
implement this behaviour.

The patch adds ConnectionConfiguration.customSSLContext with appropriate
getter/setter methods and uses the custom context in XMPPConnection.

Signed-Off-By: Georg Lukas <georg@op-co.de>

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@13520 b35dd754-fafc-0310-a699-88a17e54d16e

source/org/jivesoftware/smack/ConnectionConfiguration.java

@@ -24,6 +24,7 @@ import org.jivesoftware.smack.proxy.ProxyInfo;
 import org.jivesoftware.smack.util.DNSUtil;
 
 import javax.net.SocketFactory;
+import javax.net.ssl.SSLContext;
 import javax.security.auth.callback.CallbackHandler;
 import java.io.File;
 
@@ -59,6 +60,7 @@ public class ConnectionConfiguration implements Cloneable {
     private boolean selfSignedCertificateEnabled = false;
     private boolean expiredCertificatesCheckEnabled = false;
     private boolean notMatchingDomainCheckEnabled = false;
+    private SSLContext customSSLContext;
 
     private boolean compressionEnabled = false;
 
@@ -486,6 +488,25 @@ public class ConnectionConfiguration implements Cloneable {
         this.notMatchingDomainCheckEnabled = notMatchingDomainCheckEnabled;
     }
 
+    /**
+     * Gets the custom SSLContext for SSL sockets. This is null by default.
+     *
+     * @return the SSLContext previously set with setCustomSSLContext() or null.
+     */
+    public SSLContext getCustomSSLContext() {
+        return this.customSSLContext;
+    }
+
+    /**
+     * Sets a custom SSLContext for creating SSL sockets. A custom Context causes all other
+     * SSL/TLS realted settings to be ignored.
+     *
+     * @param context the custom SSLContext for new sockets; null to reset default behavior.
+     */
+    public void setCustomSSLContext(SSLContext context) {
+        this.customSSLContext = context;
+    }
+
     /**
      * Returns true if the connection is going to use stream compression. Stream compression
      * will be requested after TLS was established (if TLS was enabled) and only if the server

source/org/jivesoftware/smack/XMPPConnection.java

@@ -763,14 +763,14 @@ public class XMPPConnection extends Connection {
      * @throws Exception if an exception occurs.
      */
     void proceedTLSReceived() throws Exception {
-        SSLContext context = SSLContext.getInstance("TLS");
+        SSLContext context = this.config.getCustomSSLContext();
         KeyStore ks = null;
         KeyManager[] kms = null;
         PasswordCallback pcb = null;
 
         if(config.getCallbackHandler() == null) {
            ks = null;
-        } else {
+        } else if (context == null) {
             //System.out.println("Keystore type: "+configuration.getKeystoreType());
             if(config.getKeystoreType().equals("NONE")) {
                 ks = null;
@@ -826,9 +826,11 @@ public class XMPPConnection extends Connection {
         }
 
         // Verify certificate presented by the server
-        context.init(kms,
-                new javax.net.ssl.TrustManager[]{new ServerTrustManager(getServiceName(), config)},
+        if (context == null) {
+            context = SSLContext.getInstance("TLS");
+            context.init(kms, new javax.net.ssl.TrustManager[] { new ServerTrustManager(getServiceName(), config) },
                     new java.security.SecureRandom());
+        }
         Socket plain = socket;
         // Secure the plain connection
         socket = context.getSocketFactory().createSocket(plain,