NAME

       rlm_mschap - FreeRADIUS Module

DESCRIPTION

       The rlm_mschap module provides MS-CHAP and MS-CHAPv2 authentication support.

       This  module  validates  a  user  with  MS-CHAP or MS-CHAPv2 authentication.  If called in
       Authorize, it will look for MS-CHAP Challenge/Response attributes in the Acess-Request and
       adds  an  Auth-Type attribute set to MS-CHAP in the Config-Items list unless Auth-Type has
       already set.

       The module can authenticate the MS-CHAP session via  plain-text  passwords  (User-Password
       attribute),   or   NT  passwords  (NT-Password  attribute).   The  module  cannot  perform
       authentication against an NT domain.

       The module also enforces the SMB-Account-Ctrl attribute.  See the Samba documentation  for
       the  meaning  of  SMB  account  control.   The  module does not read Samba password files.
       Instead, the fIrlm_passwd module can be used to read a Samba password file, and supply  an
       NT-Password attribute which this module can use.

       The main configuration items to be aware of are:

       authtype
              This  is  the  string  used to set the authtype.  Normally it should be left to the
              default value of MS-CHAP.

       use_mppe
              Unless this is set to 'no', FreeRADIUS will add MS-CHAP-MPPE-Keys for MS-CHAPv1 and
              MS-MPPE-Recv-Key/MS-MPPE-Send-Key for MS-CHAPv2.  The default is 'yes'.

       require_encryption
              If  MPPE  is  enabled,  setting  this  attribute  to  'yes' will cause the MS-MPPE-
              Encryption-Policy attribute to be set to require encryption.  The default is 'no'.

       require_strong
              If MPPE is enabled, setting  this  attribute  to  'yes'  will  cause  the  MS-MPPE-
              Encryption-Types  attribute  to  be  set  to require a 128 bit key.  The default is
              'no'.

       with_ntdomain_hack
              Windows clients  send  User-Name  in  the  form  of  "DOMAIN\User",  but  send  the
              challenge/response  based  only  on  the  User portion.  Setting this value to yes,
              enables a work-around for this error.  The default is 'no'.

CONFIGURATION

       modules {
         ...
         mschap {
            authtype = MS-CHAP
            use_mppe = yes
         }
         ...
       }
        ...
       authorize {
         ...
         mschap
         ...
       }
        ...
       authenticate {
         ...
         mschap
         ...
       }

SECTIONS

       authorization, authentication

FILES

       /etc/raddb/radiusd.conf

SEE ALSO

       radiusd(8), radiusd.conf(5)

AUTHOR

       Chris Parker, cparker@segv.org

                                          13 March 2004                             rlm_mschap(5)