Revision as of 09:45, 17 January 2018

Nedanstående fungerar ej!

Skapa nya zoner

When adding a zone, you must add it to the permanent firewall configuration. You can then reload to bring the configuration into your running session. For instance, we could create the two zones we discussed above by typing:

   firewall-cmd --permanent --new-zone=kompisar
   firewall-cmd --permanent --new-zone=allihopa
   firewall-cmd --permanent --zone=drop --change-interface=ens160
 
   firewall-cmd --reload
   firewall-cmd --permanent --get-zones
   firewall-cmd --permanent --list-all-zones | grep -A 14 active

Lägg in vilka nät

 firewall-cmd --permanent --zone=kompisar --add-source="193.10.128.0/17"
 firewall-cmd --permanent --zone=kompisar --add-source="212.25.132.0/23"
 firewall-cmd --permanent --zone=kompisar --add-source="2001:0DB8::/32"
 firewall-cmd --reload
 firewall-cmd --permanent --list-all-zones | grep -A 14 active

• Nytt kommando ?? firewallctl zone "home" --permanent add source "2001:0DB8::/32"

Lägg till tjänster

   sudo firewall-cmd --zone=kompisar --add-service=ssh
   sudo firewall-cmd --zone=allihopa --add-service=http
   sudo firewall-cmd --zone=allihopa --add-service=https
   firewall-cmd --runtime-to-permanent
  
   firewall-cmd --reload
   
   firewall-cmd --zone=kompisar --list-all
   firewall-cmd --zone=allihopa --list-all

Lägg till PING och TRACERT

• Ändra icmp-block-inversion till YES

• Öppna för echo-request echo-reply och destination-unreachable ENDAST

   firewall-cmd --get-icmptypes 
   firewall-cmd --zone=kompisar --add-icmp-block-inversion
   firewall-cmd --zone=kompisar --add-icmp-block=echo-request 
   firewall-cmd --zone=kompisar --add-icmp-block=echo-reply
   firewall-cmd --zone=kompisar --add-icmp-block=destination-unreachable
   firewall-cmd --runtime-to-permanent

Resultat

 firewall-cmd --list-all-zones | grep -A 14 active

kompisar (active)
 target: default
 icmp-block-inversion: yes
 interfaces:
 sources: 193.10.128.0/17 2001:1:2::0/64
 services: ssh
 ports:
 protocols:
 masquerade: no
 forward-ports:
 sourceports:
 icmp-blocks: destination-unreachable echo-reply echo-request
 rich rules:

public (active)
 target: default
 icmp-block-inversion: no
 interfaces: ens160
 sources:
 services: dhcpv6-client ssh
 ports: 8000/tcp
 protocols:
 masquerade: no
 forward-ports:
 sourceports:
 icmp-blocks:
 rich rules:

KONTROLLERA RESULTAT

• Kontrollera att att en port (22) inte är definierad samtidigt som en service (ssh)
  Det skall bara finnas ett "hål" i brandväggen per tjänst, inte två!
• iptables -v -L
• ip6tables -v -L

Överkurs

firewall-cmd --direct --get-all-rules
ipv4 filter INPUT 0 -m state --state NEW -j LOG '--log-prefix=RobLog '