TLS for inter-node peer connections

When the cluster's client port is TLS-enabled, peer connections (which connect to
that same port) must also speak TLS. PeerManager gains setPeerClientContext/
getPeerClientContext, and PeerNode installs that context on its client before
logon. Null (the default) leaves peering plaintext — a no-op, so non-TLS clusters
are unchanged.

core/src/main/java/com/threerings/presents/peer/server/PeerManager.java

@@ -1319,6 +1319,27 @@ public abstract class PeerManager
         return PeerNode.class;
     }
 
+    /**
+     * Sets the {@link SSLContext} that {@link PeerNode}s use to wrap their connections to other
+     * nodes in TLS. When the cluster's client port is TLS-enabled, peer connections (which connect
+     * to that same port) must also speak TLS; this is the client-side (pinned-truststore) context
+     * the peer node installs on its client before logon. Null (the default) leaves peer connections
+     * plaintext. Set this before peers are discovered/connected.
+     */
+    public void setPeerClientContext (javax.net.ssl.SSLContext ctx)
+    {
+        _peerClientContext = ctx;
+    }
+
+    /**
+     * Returns the {@link SSLContext} peer nodes use to wrap connections to other nodes, or null if
+     * peer connections are plaintext.
+     */
+    public javax.net.ssl.SSLContext getPeerClientContext ()
+    {
+        return _peerClientContext;
+    }
+
     /**
      * Creates credentials that a {@link PeerNode} can use to authenticate with another node.
      */
@@ -1812,6 +1833,9 @@ public abstract class PeerManager
     protected String _nodeName;
     protected String _sharedSecret;
     protected NodeRecord _self;
+
+    /** TLS context peer nodes use when connecting to other nodes, or null for plaintext peering. */
+    protected javax.net.ssl.SSLContext _peerClientContext;
     protected NodeObject _nodeobj;
     protected String _nodeNamespace;
     protected Map<String,PeerNode> _peers = Maps.newHashMap();

core/src/main/java/com/threerings/presents/peer/server/PeerNode.java

@@ -140,6 +140,9 @@ public class PeerNode
 
         // otherwise configure our client with the right bits and logon
         _client.setCredentials(_peermgr.createCreds());
+        // if the cluster's client port is TLS-enabled, peer connections must speak TLS too;
+        // null (plaintext peering) is a no-op (see PeerManager.setPeerClientContext)
+        _client.setSSLContext(_peermgr.getPeerClientContext());
         _client.setServer(hostName, new int[] { _record.port });
         _client.logon();
         _lastConnectStamp = System.currentTimeMillis();