Difference between revisions of "Netband Project - Zone based Firewall(ZFW)"

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<accesscontrol>NetBand</accesscontrol>
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=Zone based Firewall(ZFW)=
 
This page is part of the [[Netband_Project|Netband Project]]<br/>  
 
This page is part of the [[Netband_Project|Netband Project]]<br/>  
 +
__NOTOC__
 +
==Branch router with DMZ==
 +
In this example the configuration will what you would expect from a branch office with an inside, outside and a DMZ interface for local servers.
 +
ZFW is not like IOS firewalling with ip inspect, the inspect firewall is a per interface rule firewall where ZFW is a direction firewall with one-to-one, one-to-many or many-to-many.
 +
===Vlans===
 +
Creating vlans to make the vlan interfaces on
 +
<pre>vlan 2
 +
name INSIDE
 +
vlan 3
 +
name OUTSIDE
 +
vlan 4
 +
name DMZ
 +
</pre>
 +
===Security zones===
 +
Declaring Zones which will be mapped to the interfaces
 +
<pre>zone security INSIDE-ZONE
 +
zone security OUTSIDE-ZONE
 +
zone security DMZ-ZONE
 +
</pre>
  
−
==Branch router with DMZ==
+
===Vlan interfaces===
−
===HTTP Aplication inspection===
+
Creating vlan interfaces for the different zones
−
<pre>parameter-map type regex uri_regex_cm
+
<pre>interface vlan 2
 +
description Inside interface
 +
ip address 10.0.0.1 255.255.255.0
 +
zone-member security INSIDE-ZONE
 +
!
 +
interface vlan 3
 +
description Outside interface
 +
ip address 80.225.34.13 255.255.255.0
 +
zone-member security OUTSIDE-ZONE
 +
!
 +
interface vlan 4
 +
description DMZ interface
 +
zone-member security DMZ-ZONE
 +
</pre>
 +
===Customizing your matches===
 +
If you need a custom tcp port to be allowed to pass through the zones
 +
<pre>ip port-map user-streaming port tcp 8000 description Custom Video Streaming port
 +
</pre>
 +
Create a parameter map of regular expressions your http requests will be matched against
 +
<pre>parameter-map type regex URLS-PARAMAP
 
  pattern ..*cmd.exe.
 
  pattern ..*cmd.exe.
 
  pattern ..*sex.
 
  pattern ..*sex.
 
  pattern ..*gambling.
 
  pattern ..*gambling.
 +
</pre>
 +
 +
===Class-maps===
 +
This will specify what traffic the class-maps will match on.
 +
<pre>class-map type inspect match-any INSIDE-OUTSIDE-CMAP
 +
match protocol tcp
 +
match protocol udp
 +
match protocol icmp
 
!
 
!
−
class-map type inspect http match-all uri_check_cm
+
class-map type inspect match-any INSIDE-DMZ-CMAP
−
  match  request uri regex uri_regex_cm
+
  match protocol tcp
 +
  match protocol udp
 +
match protocol icmp
 
!
 
!
−
class-map type inspect match-any INSIDE-OUT-HTTP
+
class-map type inspect match-any OUTSIDE-DMZ-CMAP
 
  match protocol http
 
  match protocol http
 +
match protocol https
 +
match protocol user-streaming
 
!
 
!
−
policy-map type inspect http uri_check_pm
+
class-map type inspect http match-all URLS-CMAP
−
  class type inspect http uri_check_cm
+
match request uri regex URLS-PARAMAP
 +
</pre>
 +
===Policy-maps===
 +
This will make a policy-map witch will descripe what actions to take on the trafik that matches our class-maps
 +
<pre>policy-map type inspect http URLS-PMAP
 +
  class type inspect http URLS-CMAP
 
   reset
 
   reset
 
  class class-default
 
  class class-default
 
!
 
!
−
policy-map type inspect INSIDE-OUT-PMAP
+
policy-map type inspect OUTSIDE-DMZ-PMAP
−
  class type inspect INSIDE-OUT-HTTP
+
class type inspect OUTSIDE-DMZ-CMAP
 +
  inspect
 +
class class-default
 +
  drop
 +
!
 +
policy-map type inspect INSIDE-OUTSIDE-PMAP
 +
class type inspect INSIDE-OUTSIDE-CMAP
 
   inspect
 
   inspect
−
  service-policy http uri_check_pm
+
service-policy http URLS-PMAP
 +
class class-default
 +
  drop
 +
!
 +
policy-map type inspect INSIDE-DMZ-PMAP
 +
class type inspect INSIDE-DMZ-CMAP
 +
  inspect
 +
class class-default
 +
  drop
 
</pre>
 
</pre>
 +
===Zone-pairs===
 +
And the we need to map zones together in zone-pairs with a traffic direction and connect the policy-maps to them
 +
<pre>zone-pair security INSIDE-OUTSIDE-ZONEP source INSIDE-ZONE destination OUTSIDE-ZONE
 +
service-policy type inspect INSIDE-OUTSIDE-PMAP
 +
!
 +
zone-pair security INSIDE-DMZ-ZONEP source INSIDE-ZONE destination DMZ-ZONE
 +
service-policy type inspect INSIDE-DMZ-PMAP
 +
!
 +
zone-pair security OUTSIDE-DMZ-ZONEP source OUTSIDE-ZONE destination DMZ-ZONE
 +
service-policy type inspect OUTSIDE-DMZ-PMAP
 +
</pre>
 +
 +
==Nifty Features==
 +
All this zone-based firewalling is not only a layer3 thing.<br/>
 +
Try creating a bridging interface and make it your Layer3 link and assign two vlan to that bridge group. Now it is possible to place 2 servers in different vlans, but in the same layer 2 subnet and still have a firewall between them.<br/>
 +
Now you have a Layer 2 firewall:-)
  
 
==External links==
 
==External links==
Line 30: Line 115:
 
<br>
 
<br>
 
http://www.cisco.com/en/US/docs/ios/sec_data_plane/configuration/guide/sec_zone_polcy_firew.html
 
http://www.cisco.com/en/US/docs/ios/sec_data_plane/configuration/guide/sec_zone_polcy_firew.html
 +
[[Category:network]][[Category:CCNP]][[category:students]][[category:CCNP4]]

Latest revision as of 14:25, 15 October 2009

Zone based Firewall(ZFW)

This page is part of the Netband Project

Branch router with DMZ

In this example the configuration will what you would expect from a branch office with an inside, outside and a DMZ interface for local servers. ZFW is not like IOS firewalling with ip inspect, the inspect firewall is a per interface rule firewall where ZFW is a direction firewall with one-to-one, one-to-many or many-to-many.

Vlans

Creating vlans to make the vlan interfaces on 

vlan 2
 name INSIDE
vlan 3
 name OUTSIDE
vlan 4
 name DMZ

Security zones

Declaring Zones which will be mapped to the interfaces 

zone security INSIDE-ZONE
zone security OUTSIDE-ZONE
zone security DMZ-ZONE

Vlan interfaces

Creating vlan interfaces for the different zones 

interface vlan 2
 description Inside interface
 ip address 10.0.0.1 255.255.255.0
 zone-member security INSIDE-ZONE
!
interface vlan 3
 description Outside interface
 ip address 80.225.34.13 255.255.255.0
 zone-member security OUTSIDE-ZONE
!
interface vlan 4
 description DMZ interface
 zone-member security DMZ-ZONE

Customizing your matches

If you need a custom tcp port to be allowed to pass through the zones 

ip port-map user-streaming port tcp 8000 description Custom Video Streaming port

Create a parameter map of regular expressions your http requests will be matched against 

parameter-map type regex URLS-PARAMAP
 pattern ..*cmd.exe.
 pattern ..*sex.
 pattern ..*gambling.

Class-maps

This will specify what traffic the class-maps will match on. 

class-map type inspect match-any INSIDE-OUTSIDE-CMAP
 match protocol tcp
 match protocol udp
 match protocol icmp
!
class-map type inspect match-any INSIDE-DMZ-CMAP
 match protocol tcp
 match protocol udp
 match protocol icmp
!
class-map type inspect match-any OUTSIDE-DMZ-CMAP
 match protocol http
 match protocol https
 match protocol user-streaming
!
class-map type inspect http match-all URLS-CMAP
 match request uri regex URLS-PARAMAP

Policy-maps

This will make a policy-map witch will descripe what actions to take on the trafik that matches our class-maps 

policy-map type inspect http URLS-PMAP
 class type inspect http URLS-CMAP
  reset
 class class-default
!
policy-map type inspect OUTSIDE-DMZ-PMAP
 class type inspect OUTSIDE-DMZ-CMAP
  inspect
 class class-default
  drop
!
policy-map type inspect INSIDE-OUTSIDE-PMAP
 class type inspect INSIDE-OUTSIDE-CMAP
  inspect
 service-policy http URLS-PMAP
 class class-default
  drop
!
policy-map type inspect INSIDE-DMZ-PMAP
 class type inspect INSIDE-DMZ-CMAP
  inspect
 class class-default
  drop

Zone-pairs

And the we need to map zones together in zone-pairs with a traffic direction and connect the policy-maps to them 

zone-pair security INSIDE-OUTSIDE-ZONEP source INSIDE-ZONE destination OUTSIDE-ZONE
 service-policy type inspect INSIDE-OUTSIDE-PMAP
!
zone-pair security INSIDE-DMZ-ZONEP source INSIDE-ZONE destination DMZ-ZONE
 service-policy type inspect INSIDE-DMZ-PMAP
!
zone-pair security OUTSIDE-DMZ-ZONEP source OUTSIDE-ZONE destination DMZ-ZONE
 service-policy type inspect OUTSIDE-DMZ-PMAP

Nifty Features

All this zone-based firewalling is not only a layer3 thing.
Try creating a bridging interface and make it your Layer3 link and assign two vlan to that bridge group. Now it is possible to place 2 servers in different vlans, but in the same layer 2 subnet and still have a firewall between them.
Now you have a Layer 2 firewall:-)

External links

http://www.cisco.com/en/US/products/sw/secursw/ps1018/products_tech_note09186a00808bc994.shtml
http://www.cisco.com/en/US/docs/ios/sec_data_plane/configuration/guide/sec_zone_polcy_firew.html

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