User-ID Group Mapping not working in a security policy
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User-ID Group Mapping not working in a security policy

L2 Linker

Hi,

 

I have searched and found similar posts but none seem to have a working solution for this...

 

I have a simple security policy to deny access to a VM located in the 'trust' zone if it matches a user in the user group created on the AD server.

 

I've confirmed with 'show user group name' that the firewall can indeed see the correct users in the group but when applying that group to the deny policy i'm not getting a hit.

 

 

any ideas?

 

Thanks,

 

 

1 ACCEPTED SOLUTION

Accepted Solutions

Ok some good info...

the user ip mapping ggrant does not have the domain prefix so using domain groups will not work.

 

this will work if you add the domain to the authentication profile, this is what i do for my ipads and domain authentication works fine.

 

 

View solution in original post

15 REPLIES 15

L2 Linker

First thing is, does the user actually have an IP mapping? A group mapping alone isn't enough for this to work.

 

> show user ip-user-mapping all

Or check the traffic log historically for the time you tested it, does the 'src user' field have a value or not?

Yes the user has an IP mapping.

 

The user is accessing via GlobalProtect VPN which drops the user into 'VPN_Zone'. There's no issues with VPN connectivity and the user can access everything in the 'trust' zone which I can confirm in the logs. Yes their username is showing under 'src user'.

 

I then place a rule above the 'allow all' rule I have for VPN users to access resources in the 'trust zone'.

 

This deny rule to block access to a specific IP address contains the users group on the AD directory. The same group that contains the user that is connected via the VPN successfully.

 

 

It sounds like there may be a mismatch between IP and group mapping.

 

Please check the domain/username formats between:

> Show user Ip-user-mapping all

> Show user user-ids all

 

And are you overriding domain in the auth profile or group mapping settings? Is so, are they set to the same thing? If not, you may need to override one or the other.

 

 

 

 

 

 

 

 

The output of the commands you recommended shows that the user with the IP address is indeed the same as the user in the AD group. All output is as expected. This is a lab setup so I only have one group and I can see the username is correct.

 

No I'm not overriding domain in auth profile or group mapping. I thought the firewall automatically detected the domain from the server profile? I've left 'User Domain' blank and 'Username Modifier' as the default '%USERINPUT%' in auth profile and group mapping.


Yes their username is showing under 'src user'.

does the username begin with userdomain\

 

if not then you will need to add the domain name into the auth profile  "User Domain".

 

 

If I enter the domain in the auth profile  'User Domain' field then it messes up the VPN setup and the user can no longer connect.

 

At the moment the user authenticates to the LDAP server successfully when connecting via GlobalProtect and can access resources on the network. This tells me there is nothing wrong with reaching the AD server and authenticating the user in the user group. The user gets an IP and can access resources.

 

When logged in as the user via the GlobalProtect VPN I can see in the traffic log it's successfully showing the correct 'source user' as I connect to different network resources.

 

What I don't understand why is if I then try to create a rule blocking that user from accessing a specific IP on the network it doesn't work. I know the rule is working because if I remove the 'Source User' part of the rule I get hits and it shows the correct user in the log.

 

ok lets go back a step....   do you actually have a rule that allows that AD group access to the network?

 

or is it just allowed by source zone or individual user?

 

At present anyone connecting in via VPN can access the network via an 'allow any' rule from 'SSL_VPN' zone to the 'trust' zone.

 

I've placed a rule above that rule to deny access to one IP address on the network if the source user is in the 'hpslab\globalprotect-vpnusers' group. This group has been pulled from the AD server and contains the user that I'm logged in via the VPN to test with.

 

So as it stands at the moment I can still access the '192.168.50.1' IP and the deny rule isn't working.

 

Screenshot 2021-05-07 at 11.56.30.png

ok so the reason why the rule with the group is not working is because it is a domain group and your user auth does not contain the domain info as mentioned earlier, you need to find out why this causes an issue to your login when added.

 

i will test in my lab and update later today.

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