Category Archives: Fortigate

FGT traffic shaping in 5.4 – Per Policy/shared options

The best docs are always at docs.fortinet.com

Fortigate traffic shaping is awesome, lots of options and it all works really well. Going from 5.2 to 5.4/5.6 is quite different due to the creation of policies changing from within the firewall policy, to their own section. Either way, they all work great.

I did notice at least in 5.4 that the option to change how a policy is used do not seem to be in the GUI. Previously there were two options – “Per Policy”, and “all policies using this shaper”. Selecting “all policies using this shaper” would have all policies using that shaper object to share the guaranteed or Max bandwidth settings between all policies using that shaper. Selecting “Per Policy” allows you to dedicate those same settings to each policy referencing the shaper object.

Which gets to my point, in 5.2 you had the options below. Notice the options about how to apply the shaper.

5-2

In 5.4.5 at least notice that they are gone. Of course, if you upgraded from 5.2 the options are there.

5-4

So as with everything that does not show up in the GUI – you know it is in CLI. So I dropped down to CLI to check if the settings are still there. By editing the shaper, and using the “get” command I could see all settings and their values the policy had to offer. As I thought the option “Per-Policy” is there with the default settings of disabled. So by default, all Shaper policies have  settings shared between different traffic policies referencing that shaper.

edit-shaper

So in this case, I want to give the same percentage of bandwidth to each of the traffic shaper policies referencing my shaper object. So I will modify that option.

set-options

Now, in the GUI lets check that policy again –

after-changes

Awesome, now we have the actual options to change.

Fortinet – Common PCI/Security audit issues

This is an ongoing blog, and one that I will update often will things that come up in security audits.

Companies are always getting external audits to make sure they comply with policies and have no outstanding vulnerabilities with their systems. This is great, but sometime the Fortigate will get pinged on SSL/SSH encryption level issues. The following blog is a few helpful commands that can get the Fortinet to pass inspection by disabling the lowest or least secure SSL and SSH protocols. Also below I have put in excerpts from a few scans.

Issue 1:

tls-1

Error: TLS Version 1 Protocol Detection – So the above was an issue with TLS Version 1.0 being enabled on port 443 (My SSL VPN port). So, we need to remove TLS 1.0 from the accepted protocols on the VPN.

The commands to do that are:

config vpn ssl settings
    set tlsv1-1 disable
end

The disables TLSv1 from the SSL VPN

Next issue

  • Vulnerability Details 116818

This host is susceptible to the SSL version 3 POODLE (Padding Oracle On Downgraded Legacy Encryption) attack. By using SSL version 3 and CBC Mode ciphers this host can allow an attacker to expose encrypted data in a connection between the client and server. Impact: Over time, an attacker can steal sensitive information between the client and the server using this man in the middle attack. Hosts may default to a more secure protocol (TLS 1.2, for example), but a network attacker could potentially trigger a reconnection causing the browser to retry older protocols (SSL version 3).

The above error basically says that SSL Version 3 was enabled on SSL VPN port. Just like before we will disable that

config vpn ssl settings
    set sslv3 disable
set tlsv1-0 disable
set tlsv1-1 disable
end

This turns of SSLV3 from the SSL VPN supported protocols.

This Entry will be updated as I find more from going through audits.

Fortigate – Simple device hardening

As always docs.fortinet.com has the best information.

Firewalls almost always interface with the internet, and most of the time we enable remote access from the internet to make our lives easier when troubleshooting an issue, and maybe not being behind the firewall at the time. The best why to secure the device is just not enable access from insecure locations, but some times we have to enable it.

There are a few simple things we can do to help elevate vulnerable spots when allowing access from the internet.

  • Enable a password policy
  • Modify lockout policy/duration if needed
  • Allow admin access from only Trusted hosts
  • Modify default access TCP ports
  • Create a new admin account named something different, and then delete the default admin account.
  • Make sure a log in banner is active – Certain cyber laws need explicit notification that the user attempting login should have authorization.
  • Use dual factor authentication to gain admin access to the device.
  • Logging , always logging!

This blog is written with both 5.2 and 5.4 firmwares.

Enabling a password policy

This is great to do if you have multiple accounts on the device. This way a user cannot change their super complex password to something with 3-4 letters. A password policy enforces certain specifics to the password. For example you can set the character requirements as well as password reuse/expiration. Check out the below images for 5.2 and 5.4. Notice you can enable this for VPN accounts and admin accounts.

5.4

password-po

5.2

password-pol-5-2

Login failure lockout duration and Threshold

When you mistype your password 3 times by default you are locked out of the firewall for 5 minutes (All docs say 60 seconds though). This is a great defense against applications that attempts to brute for the firewall user/pass. Increasing the time the user is locked out can be a good idea to keep the bad guys from knocking, but could also really put a damper in your day if you lock yourself out for X amount of time.

But the commands to lower or increase it are the same in both firmware’s:

config sys global

set admin-lockout-duration X (seconds)

end

To increase the threshold (how many incorrect login attempts you can have)

config sys global

set admin-lockout-threshold (1-10 attempts)

end

Only allow logins from Trusted hosts

Why allow logins from anywhere on the internet, when you know if you logged in it would come from only a few sources.

5.4

Under the administrators options, you can select the trusted hosts (IP networks) that can login with the Mirazon account in this case. You could also modify the default admin account.

trusted-5-4

 5.2

truested-5-2

Change default port numbers used for logins

I was in a debate one time about the security of changing default port numbers, and a friend said “Changing your login port numbers is as secure as hiding your keys under the front door mat.” He was most certainly correct, but security by obscurity is better than nothing. By changing the default port numbers from 443,80 some bots that try to log in will not find the open login due to different ports that are not in its scanning script.

In the following examples I am changing the default port of 443 to 8081.

5.4

ports-5-4

5.2

ports-5-2

Summary

In summary there are tons of things to do to increase device security. One of the most important, if you don’t need to allow remote logins to the device, why even enable it? Disable the login options under the interface. I believe the best practice is to have an out of band management PC that might connect directly into the MGMT port. To access the FW you have to access this machine.

Changing Port numbers and implementing the other options are great ways to help reduce login failure attempts, or unauthorized access. Another great option, not explained here is using dual factor authentication. By default you get two licenses for two factor – why not use it for admin access!

The importance of logging is one thing that cannot be underestimated. When logging is enabled you know exactly what happened – if someone tried to log in, from where, what username, and if they failed or were successful.

These were just a few of the many ways to increase device security.

Link to login banner blog: https://www.mirazon.com/how-to-implement-a-fortigate-login-banner/

Fortigate 5.4 – Named policies

Fortigate has done a great job with the 5.4 firmware. Its a big change from 5.2 but once you get going with it, you will find things are structured very well. For example the “Monitor” category is a great way to get everything you need, instead of going through each individual category.

One feature of 5.4 that really “Grinds my gears” is the named policy feature. The feature itself is awesome, great way to put in a name on a policy such as “Students to internet”.. etc.  But, they make it mandatory to put in a name by default. What’s so aggregating about this is that if you upgrade to 5.4 from 5.2 all of your policies are unnamed, so when you modify one of those existing policies you HAVE to put in a name. The following will show how to turn that feature off, so it is not mandatory you put in a name. You still can, just don’t have to.

Below you will see what happens when you try to create that policy , and the the feature has not been disabled. You get the “This field is required.” error. It will not let you create or modify the policy until that is filled in.

rule-creation-error

To disable this feature, go to system-Feature select- then check “Allow unnamed policies”. Once you press Apply this will let you bypass the mandatory name feature.

services

Fortigate: GRE tunnel creation

A GRE (Genereic Routing Encapsulation) is a tunneling protocol that allows data to be encapsulated and sent over a simulated point-to-point link. The beauty of it is that it will encapsulate many different types of traffic and De-encapsulate it on the other. This basically means any traffic sent to the tunnel interface will be stuffed it in a envelope and sent to the remote gateway, removed from the envelope,  and forwarded normally. The network which the traffic is being routed across  only sees GRE and not the individual IP header. A GRE tunnel can be used with or without IPSEC for encryption. This blog entry creates a tunnel WITHOUT IPSEC.

This is not only a one of the only ways to get Routing updates/traffic such as OSPF across a IPSEC VPN, but also is a wonderful troubleshooting option.I have seen this be a great troubleshooting tool when an MPLS might be blocking traffic.

Recently I have utilized a GRE tunnel  to tunnel all multicast traffic across a MPLS network that does not support multicast. By tunneling all the Mulicast data, the MPLS only saw GRE packets and the multicast streams worked great.

In this post I will demonstrate how to create a GRE tunnel between two Fortigate firewalls. Traffic will then be encapsulated from the source and de-encapsulated and forwarded normally on the remote end point. Most of the GRE configuration within the Fortigate is CLI only and not something that can be configured in the GUI.

Steps needed

  • Create System GRE tunnel, Assign local and remote gateways (WAN IPs)
  • Modify system interface GRE settings and assign local/remote tunnel IPs (Tunnel IPs)
  • Create Firewall policies to allow traffic
  • Create routes to remote side of the tunnel , and select GRE tunnel as destination interface
  • Test

The process is relatively straight forward and simple. First we need to create our GRE tunnel. The two sites we will be creating the tunnel on are Site-A, and Site-B.

Here is an overview of the network

GRE-overview

Site A

CLI commandsconfig system gre-tunnel
edit “GRE-to-SITEB”
set interface “WAN1”
set remote-gw 2.2.2.1    — Remote firewall WAN IP
set local-gw 1.1.1.1          — Local FW WAN1 IP
next
end

config system interface
edit “GRE-to-SiteB”
set vdom “root”
set ip 192.168.254.1 255.255.255.255    — Local Tunnel IP
set allowaccess ping
set type tunnel
set remote-ip 192.168.254.2                  — Remote Tunnel Endpoint IP
set snmp-index 65
set interface “WAN1”
next
end

Route CreationGRE-overview.JPG

Now we can create the static route pointing my remote traffic (10.2.2.0/24) through the GRE-to-SiteB GRE tunnel.

Route-SiteA

Firewall Policy creation

Next we need to create the Firewall policies allowing traffic from the GRE-Tunnel and to the GRE-Tunnel from the LAN interface or whichever interface your traffic originates on.

Policy-SiteA

 

SITE B

GRE Tunnel creation

config system gre-tunnel
edit “GRE-to-SITEA”
set interface “wan1”
set remote-gw 2.2.2.1
set local-gw 1.1.1.1
next
end

config system interface
edit “GRE-to-SITEA”
set vdom “root”
set ip 192.168.254.2 255.255.255.255
set allowaccess ping
set type tunnel
set remote-ip 192.168.254.1
set snmp-index 8
set interface “wan1”
next
end

Route Creation

Now we can create the static route pointing my remote traffic (10.1.1.0/24) through the GRE-to-SiteA GRE tunnel.

Route-SITEB

Firewall Policy creation

Next we need to create the Firewall policies allowing traffic from the GRE-Tunnel and to the GRE-Tunnel from the LAN interface or whichever interface your traffic originates on.

Policy-SiteB

That should be it.

Now lets see if we can ping across our tunnel. As shown below pings work great! Pinging both the tunnel interface and across the tunnel are great ways to check if this tunnel is actually working. Odds are if you have enabled ping on the tunnel interface, and cannot ping it from the other side then the tunnel is not working. Also, check the Firewall policy count to make sure it is increasing with traffic – if so everything is working .

site-a-pings

site-a-count

 

Thanks!

Fortigate – Changing outbound nat IP with IP Pools

Sometimes it is necessary to change IP address used to talk with the internet that the internal client is using. For instance it is always important to make sure your SMTP server is using the same outbound IP used for inbound traffic. I have seen this cause a good many mail servers to be blacklisted by ISPs. In the following entry we will change the IP the client is using for outbound nat.

This technique has many awesome benefits, you can nat into this IP (IP pool) only when going to a certain destination.. etc. For example, if you had to change your source IP when accessing a destination across a VPN tunnel. That example might be very important in a medical field where I have found you almost always have to nat your private traffic to a public address when accessing the VPN hosts.

The internal client address is 10.64.16.10, external IP is 1.1.1.1. In this example I only want this one internal client to be natted out of 1.1.1.1

So we have to create a Virtual IP pool . We create the Virtual IP pool by going to Policy and objects – objects – IP Pools

IP pool-create

We then can setup the pool. Notice the options

– Overload allows PAT, so many ip addresses, to one public.
– One-to-One allows one IP to that public IP
– We also have the option to nat into a Public Range of addresses

We also want this device to answer VIA Arp for 1.1.1.1

Now lets create our IPv4 Policy to allow our private IP address to be allowed to the internet (WAN1) and to be natted VIA this IP pool. I created the address object for my private host already.

policy-creation

So after creating our IPV4 policy, we have one thing left to do – make sure this is one of our first policies hit when 10.16.64.10 tries to access the internet. So lets make sure its at the top of our list, or at least above our default nat rule.

above

That’s it! if you now go to a site such as ipchicken.com or whatismyip.com you will see 1.1.1.1 if you are coming from 10.16.64.10.

Fortinet – Creating vlans for devices directly connected to device

The other day I had the need to plug a Ruckus Access point directly into the Fortigate firewall. The client only needed 1 AP, and connecting directly into one of the ports on the Fortigate was the best way – PoE was provided by an injector.

The question came up of how to create the Vlan interface when directly connecting the device to Fortigate.

In this example I will create the vlan on the Internal switch “lan”, and control the vlan from the Ruckus Zonedirector. This will create two separate logical interfaces. Internal, and Staff-Wireless, my newly created vlan.  These two interfaces will require IPV4 policies to allow communication. If you have a lot of VLANs it might be a great idea to utilize Zones in the FW to reduce the number of firewall policies needed.

Lets get started

Vlan creation of Fortigate

So, lets create the vlan for “Staff-Wifi” Vlan 200. You can just create

create-interface

Now lets put in the needed info.

Interface

The below shows the status of the interface:

show-int

Notice the VLAN ID – this is seen by right clicking the column settings and enabling that.

Thats it! The Ruckus AP will tag “Staff-Wireless” traffic as vlan 200. So, when the FGT sees the vlan tag of 200 on any ports in the lan switch, it will be treated as Staff-Wifi, thus getting all of its network and policies.

To make the AP work correctly, it needs to be plugged directly into the FGT or a switch behind the FGT that has the vlan created and that vlan would need to be tagged on both the AP and uplink to Fortigate.

Below shows the advanced options of my Ruckus  ZD. I am tagging the Staff-Wifi SSID as vlan 200.

Ruckus.JPG

Remember on the Ruckus side only vlan 200 is being tagged for Staff-wifi AP management traffic is untagged – so it would be on my “LAN” switch network.

 

Fortigate – filtering inbound BGP routes from neighbors, including Default

The other night I had need to stop receiving a default route advertised from my BGP peer. I  also thought it would be helpful for anyone that is needing to do this – and to help myself, since I forget often, to write it up.

First thing we need to do is create a Prefix list to either allow or deny the routes we want. In this case I want to filter out the default route that is being propagated to me.

config router prefix-list

prefix.

The things to note, rule 10 – I match that route exact (default). then in rule 100 I allow any other prefix – hence the “le 32”. that means anything that starts from 0.0.0.0/0-32 and since the 0/0 is blocked already in policy 10- everything else is allowed.

The we need to create our Route map to allow these routes on our in bound direction

config router route-map

Route-map

Then lets apply the route-map to our peer.

config router bgp

bgp

After applying the route-map to the inbound direction we need to clear BGP either soft, or full to make our routing changes take effect.

Run this command to check the BGP advertisements for changes, and synchronize after that.

exe router clear bgp all in soft, or clear both directions (softly) with exe router clear bgp all soft

That should do it, and you will see the default route disappear from the routes learned from your peer. You can also do this to filter routes to any destination network.

 

 

 

Blocking geographic regions in Fortigate 5.4

The best docs are always at docs.fortinet.com

Sometimes I get asked by clients how to block know attacking countries like Russia, or China from accessing their websites. I often hear that only US connections would be accessing their services so why allow others who might not be on the up and up.

Of course most attackers might pivot from compromised computers in the US, and thus bypass this security feature, but either way its not a bad idea. The below gives a good example on how to create a firewall “country” group and then block those countries from accessing any services hosted through the firewall. This will be done in Forti-OS 5.4.0. Its really the exact same steps in 5.2.

Also, there are many ways to do this. Instead of blocking Geographic regions you could only allow the ones you want to give access to.

Before beginning it might be a great idea to check out the new Fortiview feature to see what countries access your services the most. Under Fortiview- you can now see the countries tab.

Monitor-Countries

 

Great, so in this example lets block the region of China – I know its not one of the top countries accessing my services.

First lets create the address object that we want to block. In this case I am setting the name of the address object as the country I am blocking. After creating the country object, I will create an address group call “Country blocks” add this to my firewall policy. That way in the future if I want to block Ireland, I can just add that object in the group and I am done.

Creating the address object for “China”. First go to “Policy & Objects” and create a new object.

create address

Next we will fill in the needed info, and change the address type to “Geography”.

China

Now lets great that group, and add the “China” object to it.

Country-Group

Awesome, now just one more step – creating the firewall policy to block this address group.

block-policy

Press OK, move this policy to the top of all WAN-LAN or your interfaces policies. This way it gets hit before anything else.

There are more ways than 1 to do this. when allowing traffic into your VIP or policy you could instead specify only the allowed countries.