F21 System Wide Change: Workstation: Disable firewall
jwboyer at fedoraproject.org
Wed Apr 16 16:51:52 UTC 2014
On Wed, Apr 16, 2014 at 12:43 PM, Tomasz Torcz <tomek at pipebreaker.pl> wrote:
> On Wed, Apr 16, 2014 at 12:32:02PM -0400, Simo Sorce wrote:
>> > > I think what you are describing could be probably realized with SELinux
>> > > today, just with a special setroubleshoot frontend that catches the AVC
>> > > when the service tries to listen and ask the user if he wants to allow
>> > > it.
>> > >
>> > > However this would still not be completely sufficient as you completely
>> > > lack any context about what network you are operating on.
>> > >
>> > > The firewall's purpose is to block access to local services on bad
>> > > networks too, it is not a binary open/close equation when you have
>> > > machines (laptops) that roam across a variety of networks.
>> > >
>> > > Simo.
>> > >
>> > Nothing worse then asking Users Security related questions about opening
>> > firewall ports.
>> > Users will just answer yes, whether or not they are being hacked.
>> > firefox wants to listen on port 9900 in order to see this page, OK?
>> Which is not what I proposed Dan.
>> I in fact said we should *NOT* ask per application.
>> What we should ask is one single question, upon connecting to an unknown
>> network: "Is this network trusted ?"
>> If yes you open up to the local network. If no you keep ports not
>> accessible on that network.
> But firewalld currently lacks flexibility to express this fully.
"currently" is the key word.
> Firewalld only classifies "whole" interfaces, which breaks badly in
> many situations. Consider following scenario: VM with single
> network interface. This single interface has RFC1918 IPv4 address AND
> globally accesible IPv6 address. How it should be described
> in firewalld?
> - for any IPv4 incoming connection, this interface is in "trusted" ("home"?
> I never know what home/work/dmz/etc really mean)
> - for IPv6 incoming connection from 2001:6a0:138:1::/64 subnet, the zone
> is still "trusted"
> - for any other incoming connection the zone is "public" (I hope this
> means "general Internet").
> Above is trivial in iptables, but impossible with firewalld's zones.
So fix it?
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