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diff --git a/src/auth/AuthServiceHandler.h b/src/auth/AuthServiceHandler.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2009 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_AUTHSERVICEHANDLER_H
+#define CEPH_AUTHSERVICEHANDLER_H
+
+#include <stddef.h>              // for NULL
+#include <stdint.h>              // for uint64_t
+#include "common/entity_name.h"  // for EntityName
+#include "include/buffer_fwd.h"  // for bufferlist
+
+class CephContext;
+class KeyServer;
+class CryptoKey;
+struct AuthCapsInfo;
+
+enum class global_id_status_t {
+  NONE,
+  // fresh client (global_id == 0); waiting for CephXAuthenticate
+  NEW_PENDING,
+  // connected client; new enough to correctly reclaim global_id
+  NEW_OK,
+  // connected client; unknown whether it can reclaim global_id correctly
+  NEW_NOT_EXPOSED,
+  // reconnecting client (global_id != 0); waiting for CephXAuthenticate
+  RECLAIM_PENDING,
+  // reconnected client; correctly reclaimed global_id
+  RECLAIM_OK,
+  // reconnected client; did not properly prove prior global_id ownership
+  RECLAIM_INSECURE
+};
+
+std::ostream& operator<<(std::ostream& os,
+			 global_id_status_t global_id_status);
+
+struct AuthServiceHandler {
+protected:
+  CephContext *cct;
+  EntityName entity_name;
+  uint64_t global_id = 0;
+  global_id_status_t global_id_status = global_id_status_t::NONE;
+
+public:
+  explicit AuthServiceHandler(CephContext *cct_) : cct(cct_) {}
+
+  virtual ~AuthServiceHandler() { }
+
+  int start_session(const EntityName& entity_name,
+		    uint64_t global_id,
+		    bool is_new_global_id,
+		    bufferlist *result,
+		    AuthCapsInfo *caps);
+  virtual int handle_request(bufferlist::const_iterator& indata,
+			     size_t connection_secret_required_length,
+			     bufferlist *result,
+			     AuthCapsInfo *caps,
+			     CryptoKey *session_key,
+			     std::string *connection_secret) = 0;
+
+  const EntityName& get_entity_name() { return entity_name; }
+  uint64_t get_global_id() { return global_id; }
+  global_id_status_t get_global_id_status() { return global_id_status; }
+
+private:
+  virtual int do_start_session(bool is_new_global_id,
+			       bufferlist *result,
+			       AuthCapsInfo *caps) = 0;
+};
+
+extern AuthServiceHandler *get_auth_service_handler(int type, CephContext *cct, KeyServer *ks);
+
+#endif