Flat file user databases are used to list all the legitimate users for the <AuthBy FILE> module. You can also use flat file user databases as input to the builddbm and buildsql utility to create a DBM user database. See the users file in the Radiator distribution for an example.

Flat file user databases are ASCII text files containing zero or more user definitions. Lines beginning with ‘#’ are ignored. Each user definition is one or more lines. The first line must start with the user name in the first column. Subsequent lines for the user must begin with white space.

User names are quoted with double quotes (") if they contain white space. The user name must be followed by white space, followed by zero or more check items. Each check item is in the form Attribute = Value, and it defines a RADIUS attribute that is checked in Access-Requests before the user is authenticated. Multiple check items are separated by commas. There must be no comma after the last check item in the line. Values may optionally be surrounded by double quotes, which are ignored. For more information about check items, see Section 7. Check and reply items.

The second and subsequent lines are ‘reply’ items. Each line must commence with white space. Each reply item is in the form “Attribute = Value”, and it defines a RADIUS attribute that are returned to the NAS if the authentication succeeds. Such reply items are generally used to configure the NAS for the user. Each reply item must have a trailing comma (‘,’) except the last item on the last line. Values may optionally be surrounded by double quotes, which are ignored. Reply item values support special formatting characters, see Section 3.3. Special formatters.

The following figure shows an example, if the user mikem is granted access, the modem is configured for Framed-Protocol of PPP, and IP netmask of 255.255.255.0, Framed-Routing of None and a Framed-MTU of 1500.