NAME

       kadm5.acl - Kerberos ACL file

DESCRIPTION

       The  Kerberos  kadmind(8)  daemon  uses  an Access Control List (ACL) file to manage access rights to the
       Kerberos database.  For operations that affect principals, the ACL file also  controls  which  principals
       can operate on which other principals.

       The default location of the Kerberos ACL file is /etc/krb5kdc/kadm5.acl  unless this is overridden by the
       acl_file variable in kdc.conf(5).

SYNTAX

       Empty  lines  and  lines starting with the sharp sign (#) are ignored.  Lines containing ACL entries have
       the format:

          principal  permissions  [target_principal  [restrictions] ]

       Note   Line order in the ACL file is important.  The first matching entry  will  control  access  for  an
              actor principal on a target principal.

       principal
              (Partially  or fully qualified Kerberos principal name.) Specifies the principal whose permissions
              are to be set.

              Each component of the name may be wildcarded using the * character.

       permissions
              Specifies what operations may or may not be performed by a principal matching a particular  entry.
              This  is  a  string  of  one  or  more  of  the  following  list of characters or their upper-case
              counterparts.  If the character is upper-case, then the operation is disallowed.  If the character
              is lower-case, then the operation is permitted.
                                        ┌───┬───────────────────────────────────────┐
                                        │ a │ [Dis]allows    the    addition     of │
                                        │   │ principals or policies                │
                                        ├───┼───────────────────────────────────────┤
                                        │ c │ [Dis]allows the changing of passwords │
                                        │   │ for principals                        │
                                        ├───┼───────────────────────────────────────┤
                                        │ d │ [Dis]allows     the    deletion    of │
                                        │   │ principals or policies                │
                                        ├───┼───────────────────────────────────────┤
                                        │ i │ [Dis]allows      inquiries      about │
                                        │   │ principals or policies                │
                                        ├───┼───────────────────────────────────────┤
                                        │ l │ [Dis]allows the listing of principals │
                                        │   │ or policies                           │
                                        ├───┼───────────────────────────────────────┤
                                        │ m │ [Dis]allows   the   modification   of │
                                        │   │ principals or policies                │
                                        ├───┼───────────────────────────────────────┤
                                        │ p │ [Dis]allows the  propagation  of  the │
                                        │   │ principal     database    (used    in │
                                        │   │ incr_db_prop)                         │
                                        ├───┼───────────────────────────────────────┤
                                        │ s │ [Dis]allows the explicit  setting  of │
                                        │   │ the key for a principal               │
                                        ├───┼───────────────────────────────────────┤
                                        │ x │ Short for admcil. All privileges      │
                                        ├───┼───────────────────────────────────────┤
                                        │ * │ Same as x.                            │
                                        └───┴───────────────────────────────────────┘

       target_principal
              (Optional.  Partially  or  fully  qualified  Kerberos principal name.)  Specifies the principal on
              which permissions may be applied.  Each component of the  name  may  be  wildcarded  using  the  *
              character.

              target_principal  can  also  include  back-references  to  principal, in which *number matches the
              corresponding wildcard in principal.

       restrictions
              (Optional) A string of flags. Allowed restrictions are:

                 {+|-}flagname
                        flag is forced to the indicated value.  The permissible flags are the same as the +  and
                        - flags for the kadmin add_principal and modify_principal commands.

                 -clearpolicy
                        policy is forced to be empty.

                 -policy pol
                        policy is forced to be pol.

                 -{expire, pwexpire, maxlife, maxrenewlife} time
                        (getdate string) associated value will be forced to MIN(time, requested value).

              The  above  flags  act as restrictions on any add or modify operation which is allowed due to that
              ACL line.

       Warning
              If the kadmind ACL file is modified, the kadmind daemon needs to be restarted for changes to  take
              effect.

EXAMPLE

       Here is an example of a kadm5.acl file.

          */admin@ATHENA.MIT.EDU        *                           # line 1
          joeadmin@ATHENA.MIT.EDU   ADMCIL                          # line 2
          joeadmin/*@ATHENA.MIT.EDU il  */root@ATHENA.MIT.EDU       # line 3
          */root@ATHENA.MIT.EDU     cil *1@ATHENA.MIT.EDU           # line 4
          */*@ATHENA.MIT.EDU        i                               # line 5
          */admin@EXAMPLE.COM       x   * -maxlife 9h -postdateable # line 6

       (line  1)  Any  principal  in  the  ATHENA.MIT.EDU  realm  with  an admin instance has all administrative
       privileges.

       (lines 1-3) The user joeadmin has all permissions with his admin instance,  joeadmin/admin@ATHENA.MIT.EDU
       (matches  line 1).  He has no permissions at all with his null instance, joeadmin@ATHENA.MIT.EDU (matches
       line 2).  His root and other non-admin, non-null instances (e.g., extra or dbadmin) have inquire and list
       permissions with any principal that has the instance root (matches line 3).

       (line 4) Any root principal in ATHENA.MIT.EDU can inquire, list, or change the  password  of  their  null
       instance,  but not any other null instance.  (Here, *1 denotes a back-reference to the component matching
       the first wildcard in the actor principal.)

       (line 5) Any principal in the realm ATHENA.MIT.EDU  (except  for  joeadmin@ATHENA.MIT.EDU,  as  mentioned
       above) has inquire privileges.

       (line  6)  Finally,  any  principal  with  an  admin instance in EXAMPLE.COM has all permissions, but any
       principal that they create or modify will not be able to get postdateable tickets or tickets with a  life
       of longer than 9 hours.

SEE ALSO

       kdc.conf(5), kadmind(8)

AUTHOR

       MIT

COPYRIGHT

       1985-2013, MIT

1.12                                                                                                KADM5.ACL(5)