Need to block port 1521 for all machines except one.

Tue Apr 7 11:31:27 UTC 2009

I can access the port from other machines too.
There are two machines :
Server A : Application Host
Server B : Database server

The requirement here is to have access to oracle database which uses port
1521 only to these two machines.So the rules should be such that 1521 should
be blocked to all other servers EXCEPT for these two machines (Server A and
Server B).

Please let me know if you need anymore information.

Appreciate all the help provided.

Thanks!
Rohit Khaladkar

On Tue, Apr 7, 2009 at 4:32 PM, Marti, Rob <RJM002 at shsu.edu> wrote:

> From: redhat-list-bounces at redhat.com [redhat-list-bounces at redhat.com] On
> Behalf Of Rohit khaladkar [rohit.khaladkar at gmail.com]
> Sent: Tuesday, April 07, 2009 02:05
> To: General Red Hat Linux discussion list
> Subject: Re: Need to block port 1521 for all machines except one.
>
> Hi!I tried with these rules, but it doesn't work.Is there something that we
> are missing in here.
>
> On Mon, Apr 6, 2009 at 9:44 PM, Marti, Rob <RJM002 at shsu.edu> wrote:
>
> > -----Original Message-----
> > From: redhat-list-bounces at redhat.com [mailto:
> > redhat-list-bounces at redhat.com] On Behalf Of Rohit khaladkar
> > Sent: Monday, April 06, 2009 11:08 AM
> > To: General Red Hat Linux discussion list
> > Subject: Re: Need to block port 1521 for all machines except one.
> >
> > Thanks a lot!
> >
> > Here they are :
> > -A INPUT -j RH-Firewall-1-INPUT
> > -A FORWARD -j RH-Firewall-1-INPUT
> > -A RH-Firewall-1-INPUT -i lo -j ACCEPT
> > -A RH-Firewall-1-INPUT -p icmp -m icmp --icmp-type timestamp-request -j
> > REJECT
> > -A RH-Firewall-1-INPUT -p icmp -m icmp --icmp-type timestamp-reply -j
> > REJECT
> > -A RH-Firewall-1-INPUT -p icmp -m icmp --icmp-type any -j ACCEPT
> > -A RH-Firewall-1-INPUT -p esp -j ACCEPT
> > -A RH-Firewall-1-INPUT -p ah -j ACCEPT
> > -A RH-Firewall-1-INPUT -d 224.0.0.251 -p udp -m udp --dport 5353 -j
> ACCEPT
> > -A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT
> > -A RH-Firewall-1-INPUT -p tcp -m tcp --dport 631 -j ACCEPT
> > -A RH-Firewall-1-INPUT -p udp -m udp --dport 514 -j ACCEPT
> > -A RH-Firewall-1-INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
> > -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 1521 -j
> > ACCEPT
> > -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 1158 -j
> > ACCEPT
> > -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j
> > ACCEPT
> > -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
> > COMMIT
> >
> >
> > On Mon, Apr 6, 2009 at 9:21 PM, Barry Brimer <lists at brimer.org> wrote:
> >
> > >
> > > iptables -A INPUT -s <ip address of first machine you want to allow> -p
> > tcp
> > > --dport 1521 -j ACCEPT
> > > iptables -A INPUT -s <ip address of second machine you want to allow>
> -p
> > > tcp
> > > --dport 1521 -j ACCEPT
> > > <continue as needed>
> > > iptables -A INPUT -p tcp --dport 1521 -j DROP
> > >
> > > Quoting Rohit khaladkar <rohit.khaladkar at gmail.com>:
> > >
> > > > Hi!You found that right. There were other iptable rules that were
> > > > conflicting. The following command worked.
> > > >
> > > > iptables -A INPUT -s $1 -p tcp --dport 1521 -j ACCEPT
> > > > iptables -A INPUT -p tcp --dport 1521 -j DROP
> > > >
> > > >
> > > > But the problem the command gave me is I can't access the database
> from
> > > the
> > > > database server itself.
> > > >
> > > > Is there any way out we can modify this command to work for two
> > machines.
> > > >
> > > >
> > > > Thanks!
> > > > Rohit Khaladkar
> > > >
> > > > On Tue, Mar 31, 2009 at 5:21 PM, Barry Brimer <lists at brimer.org>
> > wrote:
> > > >
> > > > > Hi All,As a security measure, I need to block port 1521on the
> > database
> > > > >> server , which is used by Oracle for all machines, except one.I
> > tried
> > > > >> using
> > > > >> the following commands to block the port, but for some reason it
> is
> > > not
> > > > >> working.Can someone please help me.
> > > > >>
> > > > >>
> > > > >> iptables -A INPUT -s $1 -p tcp --dport 1521 -j ACCEPT
> > > > >> iptables -A INPUT -p tcp --dport 1521 -j DROP
> > > > >>
> > > > >> where $1 is the machine name or ip address of the machine which
> > needs
> > > > >> access
> > > > >> to the port.
> > > > >>
> > > > >
> > > > > I can't help but notice that you are using -A to append rules at
> the
> > > end of
> > > > > your existing INPUT chain.  Are there other firewall rules above
> > these
> > > > rules
> > > > > that would be accepting the traffic before these rules are even
> hit?
> > > > >
> > > > >
> > > > > --
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> > > >
> > > >
> > >
> > >
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> >
> --------------------------------------------------------------------------
> > That makes no sense - Even ignoring the first line (the -I lo -j ACCEPT
> > one) you said that oracle won't accept connections from the local box?
> >
> > This is what I would set it to:
> >
> > -A RH-Firewall-1-INPUT -i lo -j ACCEPT
> > -A RH-Firewall-1-INPUT -p icmp -m icmp --icmp-type timestamp-request -j
> > REJECT
> > -A RH-Firewall-1-INPUT -p icmp -m icmp --icmp-type timestamp-reply -j
> > REJECT
> > -A RH-Firewall-1-INPUT -p icmp -m icmp --icmp-type any -j ACCEPT
> > -A RH-Firewall-1-INPUT -p esp -j ACCEPT
> > -A RH-Firewall-1-INPUT -p ah -j ACCEPT
> > -A RH-Firewall-1-INPUT -d 224.0.0.251 -p udp -m udp --dport 5353 -j
> ACCEPT
> > -A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT
> > -A RH-Firewall-1-INPUT -p tcp -m tcp --dport 631 -j ACCEPT
> > -A RH-Firewall-1-INPUT -p udp -m udp --dport 514 -j ACCEPT
> > -A RH-Firewall-1-INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
> > -A RH-Firewall-1-INPUT -s <server1> -p tcp --dport 1521 -j ACCEPT
> > -A RH-Firewall-1-INPUT -s <server2> -p tcp --dport 1521 -j ACCEPT
> > -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 1158 -j
> > ACCEPT
> > -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j
> > ACCEPT
> > -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
> > COMMIT
> >
> > So all local traffic will be accepted (the -i lo line), the 2 servers
> > needed will be accepted (by calling them out specifically), and
> everything
> > else (for 1521) will fall through to the reject line.
> >
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>
> --------------------------------------------------------------------------------------------------
> Define "doesn't work".
>
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