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diff --git a/src/ceph/src/auth/AuthMethodList.cc b/src/ceph/src/auth/AuthMethodList.cc
new file mode 100644
index 0000000..9ac1520
--- /dev/null
+++ b/src/ceph/src/auth/AuthMethodList.cc
@@ -0,0 +1,69 @@
+// -*- 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.
+ * 
+ */
+
+#include <algorithm>
+#include "common/debug.h"
+#include "include/str_list.h"
+
+#include "AuthMethodList.h"
+
+const static int dout_subsys = ceph_subsys_auth;
+
+
+AuthMethodList::AuthMethodList(CephContext *cct, string str)
+{
+  list<string> sup_list;
+  get_str_list(str, sup_list);
+  if (sup_list.empty()) {
+    lderr(cct) << "WARNING: empty auth protocol list" << dendl;
+  }
+  for (list<string>::iterator iter = sup_list.begin(); iter != sup_list.end(); ++iter) {
+    ldout(cct, 5) << "adding auth protocol: " << *iter << dendl;
+    if (iter->compare("cephx") == 0) {
+      auth_supported.push_back(CEPH_AUTH_CEPHX);
+    } else if (iter->compare("none") == 0) {
+      auth_supported.push_back(CEPH_AUTH_NONE);
+    } else {
+      auth_supported.push_back(CEPH_AUTH_UNKNOWN);
+      lderr(cct) << "WARNING: unknown auth protocol defined: " << *iter << dendl;
+    }
+  }
+  if (auth_supported.empty()) {
+    lderr(cct) << "WARNING: no auth protocol defined, use 'cephx' by default" << dendl;
+    auth_supported.push_back(CEPH_AUTH_CEPHX);
+  }
+}
+
+bool AuthMethodList::is_supported_auth(int auth_type)
+{
+  return std::find(auth_supported.begin(), auth_supported.end(), auth_type) != auth_supported.end();
+}
+
+int AuthMethodList::pick(const std::set<__u32>& supported)
+{
+  for (set<__u32>::const_reverse_iterator p = supported.rbegin(); p != supported.rend(); ++p)
+    if (is_supported_auth(*p))
+      return *p;
+  return CEPH_AUTH_UNKNOWN;
+}
+
+void AuthMethodList::remove_supported_auth(int auth_type)
+{
+  for (list<__u32>::iterator p = auth_supported.begin(); p != auth_supported.end(); ) {
+    if (*p == (__u32)auth_type)
+      auth_supported.erase(p++);
+    else 
+      ++p;
+  }
+}