Debian和Ubuntu提供libpam-ccreds包,用于缓存网络登录凭据.从包装说明：
This package provides the means for Linux workstations to locally authenticate using an enterprise identity when the network is unavailable. Used in conjunction with the nss_updatedb utility,it provides a mechanism for disconnected use of network directories. They are designed to work with libpam-ldap and libnss-ldap.
