When a user authenticates to the network, the system calculates the user’s Security Equivalence Vector (SEV) based on information in the user’s profile in Novell eDirectory. NSS validates the user’s SEV against the file system trustee rights of the directory and file the user is attempting to access. In OES, SEVs are acquired differently for NSS on NetWare and NSS on Linux.
For NSS on NetWare, whenever a user connects to the NSS file system, NetWare retrieves the user’s SEV from eDirectory and maintains it as part of the connection structure for the user’s session. NSS automatically retrieves the user’s SEV from the connection structure.
For NSS on Linux, NSS caches the SEV locally in the server memory, where it remains until the server is rebooted or the user is deleted from eDirectory. NSS polls eDirectory at a specified interval for updates to the SEVs that are in cache. Command line switches are available in the NSS Console utility (nsscon) to enable or disable the update, to set the update interval from 5 minutes to 90 days (specified in seconds), and to force an immediate update of security equivalence vectors. For information, see Section A.32, Security Equivalence Vector Update Commands.