RCP(1)								       RCP(1)



NAME
       v4rcp - back end for Kerberos V4 rcp

SYNOPSIS
       v4rcp not invoked by users

DESCRIPTION
       This  program  is  not for user execution. The usage message indicates
       this.

       Kerberos Version 4 rsh did not support encryption. In order to perform
       encrypted  file	transfer,  the	version	 4  rcp	 program did a second
       authentication, directly to the rcp process at  the  other  end.	 This
       meant  that  rcp needed to be setuid to root in order to read the krb-
       srvtab file on the remote end.

       Rather than add this complexity into the main Kerberos 5 rcp the	 Ker-
       beros 5 kshd instead detects the use of Kerberos 4 authentication, and
       checks the command for the program name rcp and then  substitutes  the
       full  pathname  of  v4rcp instead.  Since v4rcp is installed setuid to
       root, it can perform the the authentication and get  the	 session  key
       needed to encrypt the file transfer.

       Kerberos	 5  rcp	 instead uses the encryption support built in to Ker-
       beros 5 rsh and kshd directly.

SEE ALSO
       rsh(1), rcp(1), kshd(8)



								       RCP(1)

UNIX/Linux commands referenced on this page:

1. rsh
2. rcp
3. at
4. file
5. kshd