[plug] Restricting users access

[Chris Griffin]

Greetings Folks,

If I have created a user account, say Fred, whose home directory resides in 
/home/Fred.
How can I restrict his logon so that he can only connect via sftp (I am 
running RedHat and openssh) and he can only access his home directory 
area?   NO SSH.
No ssh may not be possible, but I at least need to tie him down to only 
being able to access his home directory and nothing else.

Many thanks in advance.

Regards,
Chris Griffin