Privilege is not scalable in a big environment.
What you need is authorization on the ACS
server. In Cisco Freeware TACACS+ I defined
the following groups: readonly, advanced and
admin:
group = readonly {
default service = deny
cmd = show { deny .* }
cmd = show { permit .* }
cmd = copy { permit .* }
cmd = ping { permit .* }
cmd = enable { permit .* }
cmd = configure { deny .* }
cmd = disable { permit .* }
cmd = telnet { permit .* }
cmd = disconnect { permit .* }
cmd = where { permit .* }
cmd = set { permit .* }
cmd = clear { permit line }
cmd = exit { permit .* }
cmd = debug { permit .* }
}
group = advanced {
default service = deny
cmd = show { permit .* }
cmd = copy { permit flash }
cmd = copy { permit running }
cmd = ping { permit .* }
cmd = configure { permit .* }
cmd = enable { permit .* }
cmd = disable { permit .* }
cmd = telnet { permit .* }
cmd = disconnect { permit .* }
cmd = where { permit .* }
cmd = set { permit .* }
cmd = clear { permit line }
cmd = exit { permit .* }
cmd = interface { permit .* }
}
group = admin {
default service = permit
}
As you can see, admin can access everything,
readonly can only read. Advanced can make
limited changes and admin can do everything.
On the Cisco router, I have the following
configuration:
aaa authentication login notac none
aaa authentication login VTY group tacacs+ local
aaa authentication enable default group tacacs+ enable
aaa authorization console
aaa authorization config-commands
aaa authorization exec notac none
aaa authorization exec VTY group tacacs+ if-authenticated none
aaa authorization commands 0 VTY group tacacs+ if-authenticated none
aaa authorization commands 1 VTY group tacacs+ if-authenticated none
aaa authorization commands 15 VTY group tacacs+ if-authenticated none
aaa authorization network VTY group tacacs+ if-authenticated none
aaa accounting exec VTY start-stop group tacacs+
aaa accounting commands 0 VTY start-stop group tacacs+
aaa accounting commands 1 VTY start-stop group tacacs+
aaa accounting commands 15 VTY start-stop group tacacs+
aaa accounting network VTY start-stop group tacacs+
aaa accounting connection VTY start-stop group tacacs+
I find that by doing it this way, it is much
more scalable than using privilege commands
on the router itself.
David
CCIE Security
