v4rcp man page on CentOS

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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 authen‐
       tication, 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 Kerberos
       5 rsh and kshd directly.

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

									RCP(1)
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