--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/src/main/java/ch/ethz/ssh2/auth/ServerAuthenticationManager.java	Thu Dec 03 11:23:55 2015 -0800
@@ -0,0 +1,128 @@
+
+package ch.ethz.ssh2.auth;
+
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+
+import ch.ethz.ssh2.AuthenticationResult;
+import ch.ethz.ssh2.PacketTypeException;
+import ch.ethz.ssh2.ServerAuthenticationCallback;
+import ch.ethz.ssh2.channel.ChannelManager;
+import ch.ethz.ssh2.packets.PacketServiceAccept;
+import ch.ethz.ssh2.packets.PacketServiceRequest;
+import ch.ethz.ssh2.packets.PacketUserauthBanner;
+import ch.ethz.ssh2.packets.PacketUserauthFailure;
+import ch.ethz.ssh2.packets.PacketUserauthSuccess;
+import ch.ethz.ssh2.packets.Packets;
+import ch.ethz.ssh2.packets.TypesReader;
+import ch.ethz.ssh2.server.ServerConnectionState;
+import ch.ethz.ssh2.transport.MessageHandler;
+
+public class ServerAuthenticationManager implements MessageHandler {
+    private final ServerConnectionState state;
+
+    public ServerAuthenticationManager(ServerConnectionState state) {
+        this.state = state;
+        state.tm.registerMessageHandler(this, 0, 255);
+    }
+
+    private void sendresult(AuthenticationResult result) throws IOException {
+        if (AuthenticationResult.SUCCESS == result) {
+            PacketUserauthSuccess pus = new PacketUserauthSuccess();
+            state.tm.sendAsynchronousMessage(pus.getPayload());
+            state.tm.removeMessageHandler(this);
+            state.tm.registerMessageHandler(this, 50, 79);
+            state.cm = new ChannelManager(state);
+            state.flag_auth_completed = true;
+        }
+        else {
+            Set<String> remaining_methods = new HashSet<String>();
+
+            if (state.cb_auth != null) {
+                remaining_methods.addAll(Arrays.asList(
+                                             state.cb_auth.getRemainingAuthMethods(state.conn)));
+            }
+
+            PacketUserauthFailure puf = new PacketUserauthFailure(remaining_methods,
+                    AuthenticationResult.PARTIAL_SUCCESS == result);
+            state.tm.sendAsynchronousMessage(puf.getPayload());
+        }
+    }
+
+    public void handleFailure(final IOException failure) {
+        //
+    }
+
+    public void handleMessage(byte[] msg) throws IOException {
+        /* Ignore all authentication messages after successful auth */
+        if (state.flag_auth_completed) {
+            return;
+        }
+
+        if (!state.flag_auth_serviceRequested) {
+            /* Must be PacketServiceRequest */
+            PacketServiceRequest psr = new PacketServiceRequest(msg);
+
+            if (!"ssh-userauth".equals(psr.getServiceName())) {
+                throw new IOException("SSH protocol error, expected ssh-userauth service request");
+            }
+
+            PacketServiceAccept psa = new PacketServiceAccept("ssh-userauth");
+            state.tm.sendAsynchronousMessage(psa.getPayload());
+            String banner = state.cb_auth.initAuthentication(state.conn);
+
+            if (banner != null) {
+                PacketUserauthBanner pub = new PacketUserauthBanner(banner);
+                state.tm.sendAsynchronousMessage(pub.getPayload());
+            }
+
+            state.flag_auth_serviceRequested = true;
+            return;
+        }
+
+        ServerAuthenticationCallback cb = state.cb_auth;
+        TypesReader tr = new TypesReader(msg);
+        int packet_type = tr.readByte();
+
+        if (packet_type == Packets.SSH_MSG_USERAUTH_REQUEST) {
+            String username = tr.readString("UTF-8");
+            String service = tr.readString();
+            String method = tr.readString();
+
+            if (!"ssh-connection".equals(service)) {
+                sendresult(AuthenticationResult.FAILURE);
+                return;
+            }
+
+            if ("none".equals(method)) {
+                if (cb != null) {
+                    sendresult(cb.authenticateWithNone(state.conn, username));
+                    return;
+                }
+            }
+
+            if ("password".equals(method)) {
+                boolean flag_change_pass = tr.readBoolean();
+
+                if (flag_change_pass) {
+                    sendresult(AuthenticationResult.FAILURE);
+                    return;
+                }
+
+                String password = tr.readString("UTF-8");
+
+                if (cb != null) {
+                    sendresult(cb.authenticateWithPassword(state.conn, username, password));
+                    return;
+                }
+            }
+
+            sendresult(AuthenticationResult.FAILURE);
+            return;
+        }
+
+        throw new PacketTypeException(packet_type);
+    }
+}