[Samba] changing unix password with samba

[Merle Reine]

I am running RedHat 9 and samba.  I need to be able to set one password 
for each user and sync them with ssh, web, unix password.

i.e. When I change samba pass, it changes unix, ftp, etc.  Is this 
possible with samba?  I saw that it is if you are running windows and 
then you can change the unix pass via samba.  Is this possible when 
running linux.  I just want to easily administer my users.  I have a web 
cgi script to change the unix password which can be modifed to change 
samba pass.  This would allow users to change all their passwords in one 
place.

Any help is much appreciated.

Merle