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    Command:

    kerberos

    
    
    

    DESCRIPTION

           The  Kerberos  system authenticates individual users in a network envi-
           ronment.  After authenticating yourself to Kerberos, you can  use  Ker-
           beros-enabled programs without having to present passwords.
    
           If you enter your username and kinit responds with this message:
    
           kinit(v5):  Client not found in Kerberos database while getting initial
           credentials
    
           you haven't been registered as a Kerberos user.  See your system admin-
           istrator.
    
           A  Kerberos  name  usually contains three parts.  The first is the pri-
           mary, which is usually a user's or service's name.  The second  is  the
           instance,  which in the case of a user is usually null.  Some users may
           have privileged instances, however, such as ''root'' or ''admin''.   In
           the  case of a service, the instance is the fully qualified name of the
           machine on which it runs; i.e. there can be an rlogin  service  running
           on  the machine ABC, which is different from the rlogin service running
           on the machine XYZ.  The third part of a Kerberos name  is  the  realm.
           The  realm corresponds to the Kerberos service providing authentication
           for the principal.
    
           When writing a Kerberos name, the principal name is separated from  the
           instance  (if  not  null)  by  a slash, and the realm (if not the local
           realm) follows, preceded by an ''@'' sign.  The following are  examples
           of valid Kerberos names:
    
                   david
                   jennifer/admin
                   joeuser@BLEEP.COM
                   cbrown/root@FUBAR.ORG
    
           When  you  authenticate  yourself with Kerberos you get an initial Ker-
           beros ticket.  (A Kerberos ticket is an encrypted protocol message that
           provides authentication.)  Kerberos uses this ticket for network utili-
           ties such as rlogin and rcp.  The ticket transactions are  done  trans-
           parently, so you don't have to worry about their management.
    
           Note,  however, that tickets expire.  Privileged tickets, such as those
           with the instance ''root'', expire in a few minutes, while tickets that
           carry  more ordinary privileges may be good for several hours or a day,
           depending on the installation's policy.  If your login session  extends
           beyond  the  time  limit,  you will have to re-authenticate yourself to
           Kerberos to get new tickets.  Use the kinit command to  re-authenticate
           yourself.
    
           If you use the kinit command to get your tickets, make sure you use the
           kdestroy command to destroy your tickets before you end your login ses-
           sion.  You should put the kdestroy command in your .logout file so that
           your tickets will be destroyed automatically when you logout.  For more
                  TYPE:residual.   If  no type prefix is present, the FILE type is
                  assumed and residual is the pathname of the cache file.  A  col-
                  lection  of  multiple  caches  may be used by specifying the DIR
                  type and the pathname of a private directory (which must already
                  exist).   The default cache file is /tmp/krb5cc_uid where uid is
                  the decimal user ID of the user.
    
           KRB5_KTNAME
                  Specifies  the  location  of  the  keytab  file,  in  the   form
                  TYPE:residual.   If no type is present, the FILE type is assumed
                  and residual is the pathname of the keytab  file.   The  default
                  keytab file is /etc/krb5.keytab.
    
           KRB5_CONFIG
                  Specifies  the location of the Kerberos configuration file.  The
                  default is /etc/krb5.conf.
    
           KRB5_KDC_PROFILE
                  Specifies the location of the KDC configuration file, which con-
                  tains  additional configuration directives for the Key Distribu-
                  tion Center daemon and  associated  programs.   The  default  is
                  /var/kerberos/krb5kdc/kdc.conf.
    
           KRB5RCACHETYPE
                  Specifies  the  default type of replay cache to use for servers.
                  Valid types include "dfl" for the normal file  type  and  "none"
                  for no replay cache.  KRB5RCACHEDIR Specifies the default direc-
                  tory for replay caches used by  servers.   The  default  is  the
                  value  of the TMPDIR environment variable, or /var/tmp if TMPDIR
                  is not set.
    
           KRB5_TRACE
                  Specifies a filename to write trace log output to.   Trace  logs
                  can  help  illuminate  decisions made internally by the Kerberos
                  libraries.  The default is not to write trace  log  output  any-
                  where.
    
           Most  environment  variables are disabled for certain programs, such as
           login system programs and setuid programs, which  are  designed  to  be
           secure when run within an untrusted process environment.
    
    
    

    SEE ALSO

           kdestroy(1),   kinit(1),   klist(1),  kswitch(1),  kpasswd(1),  ksu(1),
           krb5.conf(5),   kdc.conf(5),   kadmin(1),   kadmind(8),   kdb5_util(8),
           krb5kdc(8)
    
    
    

    BUGS

    
    

    AUTHORS

           Steve Miller, MIT Project Athena/Digital Equipment Corporation
           Clifford Neuman, MIT Project Athena
           Greg Hudson, MIT Kerberos Consortium
    
    
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