Provided by: freeradius-common_2.1.12+dfsg-1.2ubuntu8.2_all 
NAME
users - user authorization file for the FreeRADIUS server
DESCRIPTION
The users file resides in the RADIUS database directory, by default /etc/raddb. It
contains a series of configuration directives which are used by the files module to decide
how to authorize and authenticate each user request.
Every line starting with a hash sign ('#') is treated as comment and ignored.
Each entry of the file begins with a username, followed by a (possibly empty) list of
check items, all on one line. The next line begins with a tab, and a (possibly empty)
list of reply items. Each item in the check or reply item list is an attribute of the
form name = value. Multiple items may be placed on one line, in which case they must be
seperated by commas. The reply items may be specified over multiple lines, in which case
each line must end with a comma, and the last line of the reply items must not end with a
comma.
The check items are a list of attributes used to match the incoming request. If the
username matches, AND all of the check items match the incoming request, then the reply
items are added to the list of attributes which will be used in the reply to that request.
This process is repeated for all of the entries in the users file.
If the incoming request matches NO entry, then the request is rejected.
CAVEATS
The special username DEFAULT matches any usernames.
The entries are processed in order, from the top of the users file, on down. If an entry
contains the special item Fall-Through = No as a reply attribute, then the processing of
the file stops, and no more entries are matched. Any reply item list without any Fall-
Through attribute is treated as though it included a Fall-Through = No attribute.
If an entry contains the special item Fall-Through = Yes as a reply attribute, then the
processing proceeds to the next entry in order.
Care should be taken when using Fall-Through. The server should be tested in debugging
mode with a number of test requests, in order to verify that the configured entries behave
as expected.
The special attribute Auth-Type is used to identify the authentication type to be used for
that user. See the dictionary file for a list of permitted values for the Auth-Type
attribute.
Once the users file has been processed, the request is authenticated, using the method
given by Auth-Type.
OPERATORS
Additional operators other than = may be used for the attributes in either the check item,
or reply item list. The following is a list of operators, and their meaning.
Attribute = Value
Not allowed as a check item for RADIUS protocol attributes. It is allowed for server
configuration attributes (Auth-Type, etc), and sets the value of on attribute, only
if there is no other item of the same attribute.
As a reply item, it means "add the item to the reply list, but only if there is no
other item of the same attribute."
Attribute := Value
Always matches as a check item, and replaces in the configuration items any attribute
of the same name. If no attribute of that name appears in the request, then this
attribute is added.
As a reply item, it has an identical meaning, but for the reply items, instead of the
request items.
Attribute == Value
As a check item, it matches if the named attribute is present in the request, AND has
the given value.
Not allowed as a reply item.
Attribute += Value
Always matches as a check item, and adds the current attribute with value to the list
of configuration items.
As a reply item, it has an identical meaning, but the attribute is added to the reply
items.
Attribute != Value
As a check item, matches if the given attribute is in the request, AND does not have
the given value.
Not allowed as a reply item.
Attribute > Value
As a check item, it matches if the request contains an attribute with a value greater
than the one given.
Not allowed as a reply item.
Attribute >= Value
As a check item, it matches if the request contains an attribute with a value greater
than, or equal to the one given.
Not allowed as a reply item.
Attribute < Value
As a check item, it matches if the request contains an attribute with a value less
than the one given.
Not allowed as a reply item.
Attribute <= Value
As a check item, it matches if the request contains an attribute with a value less
than, or equal to the one given.
Not allowed as a reply item.
Attribute =~ Expression
As a check item, it matches if the request contains an attribute which matches the
given regular expression. This operator may only be applied to string attributes.
Not allowed as a reply item.
Attribute !~ Expression
As a check item, it matches if the request contains an attribute which does not match
the given regular expression. This operator may only be applied to string
attributes.
Not allowed as a reply item.
Attribute =* Value
As a check item, it matches if the request contains the named attribute, no matter
what the value is.
Not allowed as a reply item.
Attribute !* Value
As a check item, it matches if the request does not contain the named attribute, no
matter what the value is.
Not allowed as a reply item.
EXAMPLES
bob Cleartext-Password := "hello"
Requests containing the User-Name attribute, with value "bob", will be
authenticated using the "known good" password "hello". There are no reply items,
so the reply will be empty.
DEFAULT Auth-Type = System
Fall-Through = Yes
For all users reaching this entry, perform authentication against the system,
unless Auth-Type has already been set. Also, process any following entries which
may match.
DEFAULT Service-Type == Framed-User, Framed-Protocol == PPP
Service-Type = Framed-User,
Framed-Protocol = PPP,
Fall-Through = Yes
If the request packet contains the attributes Service-Type and Framed-Protocol,
with the given values, then include those attributes in the reply.
That is, give the user what they ask for. This entry also shows how to specify
multiple reply items.
See the users file supplied with the server for more examples and comments.
HINTS
Run the server in debugging mode (-X), and use the radclient program to send it test
packets which you think will match specific entries. The server will print out which
entries were matched for that request, so you can verify your expectations. This should
be the FIRST thing you do if you suspect problems with the file.
Care should be taken when writing entries for the users file. It is easy to misconfigure
the server so that requests are accepted when you wish to reject them. The entries should
be ordered, and the Fall-Through item should be used ONLY where it is required.
Entries rejecting certain requests should go at the top of the file, and should not have a
Fall-Through item in their reply items. Entries for specific users, who do not have a
Fall-Through item, should come next. Any DEFAULT entries should usually come last, except
as fall-through entries that set reply attributes.
FILES
/etc/raddb/users
SEE ALSO
radclient(1), radiusd(8), dictionary(5), naslist(5)
AUTHOR
The FreeRADIUS team.
04 Jan 2004 USERS(5)