How CIFS users obtain UNIX credentials

How Data ONTAP maps names

File used for mapping names

Data ONTAP uses the /etc/usermap.cfg file to map names. In its simplest form, each /etc/usermap.cfg entry contains a pair of names: the Windows name and the UNIX name. Data ONTAP can translate the Windows name to the UNIX name or vice versa.

How Data ONTAP uses the /etc/usermap.cfg file

When Data ONTAP receives a connection request from a CIFS user, it searches the /etc/usermap.cfg file to see whether an entry matches the user's Windows domain name and user name.

If an entry is found

Data ONTAP uses the UNIX name specified in the entry to look up the UID and GID from the UNIX password database. If the UNIX name is a null string, Data ONTAP denies access to the CIFS user.

If an entry is not found

Data ONTAP converts the Windows name to lowercase and considers the UNIX name to be the same as the Windows name. Data ONTAP uses this UNIX name to look up the UID and GID from the UNIX password database.

Note
Data ONTAP scans the file sequentially. It uses the first matching entry for mapping.