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diff --git a/lib/java/dolda/dolcon/InteractiveAuth.java b/lib/java/dolda/dolcon/InteractiveAuth.java
new file mode 100644
index 0000000..0da9f2a
--- /dev/null
+++ b/lib/java/dolda/dolcon/InteractiveAuth.java
@@ -0,0 +1,34 @@
+package dolda.dolcon;
+
+import java.util.List;
+import dolda.dolcon.protocol.Response;
+import dolda.dolcon.protocol.Command;
+
+public abstract class InteractiveAuth implements Authenticator {
+    public String handles(List<String> name) {
+	if(name.contains("pam"))
+	    return("pam");
+	return(null);
+    }
+    
+    public Command step(Response resp) throws AuthException, ProtocolException, InterruptedException {
+	if(resp.code == 301) {
+	    return(new Command("pass", promptnoecho(resp.token(0, 0))));
+	} else if(resp.code == 302) {
+	    return(new Command("pass", promptecho(resp.token(0, 0))));
+	} else if(resp.code == 303) {
+	    info(resp.token(0, 0));
+	    return(new Command("pass", ""));
+	} else if(resp.code == 304) {
+	    error(resp.token(0, 0));
+	    return(new Command("pass", ""));
+	} else {
+	    throw(new ResponseException(resp, 0));
+	}
+    }
+    
+    public abstract String promptecho(String msg) throws AuthException;
+    public abstract String promptnoecho(String msg) throws AuthException;
+    public abstract void info(String msg) throws AuthException;
+    public abstract void error(String msg) throws AuthException;
+}