Ytdyklly

I recently managed to get my Ubuntu Server 18.04 machine connected to my companies Windows AD. I am able to login with my AD credentials however I want to take it a step further...

This is the article I followed in order to get my Ubuntu 18.04 machine onto the windows domain, note I did not do any configuration on restricting ssh login to a domain group as I am still struggling.
https://www.smbadmin.com/2018/06/connecting-ubuntu-server-1804-to-active.html?showComment=1548915938955#c6716393705599388679

However....

The goal of what I am trying to achieve is as follows:

• Add a line to /etc/sudoers file that specifies an AD group within my organization.


• This groups members should have sudo access on the Linux machines in our organisation.

What I've done:

• I tried adding lines like :


• "nameofdomainnameofgroup ALL=(ALL:ALL) ALL"


• And more.... However whenever I try to sudo with a user I know is in the group I receive the usual "...user not in sudoers... incident will be reported..."

What could be the reason for this? Is it perhaps due to the configurations I've specified when connecting the machine to the AD domain?

The full path to this group is as follows:
- domainname/Groups/Elab/Elab-Level3

Here is the configuration for my files used to join the AD domain:

krb5.conf

[libdefaults]

    default_realm = MYREALM

dns_lookup_kdc = true

dns_lookup_realm = true

...... rest of file ........

realmd.conf

[users]

 default-home = /home/%D/%U

 default-shell = /bin/bash



[active-directory]

 default-client = sssd

 os-name = Ubuntu Server

 os-version = 18.04



[service]

 automatic-install = no



[mydomain]

 fully-qualified-names = yes

 automatic-id-mapping = no

 user-principal = yes

 manage-system = yes

sssd.conf

[sssd] 

domains = mydomain config_file_version = 2

services = nss, pam, ssh



[domain/mydomain]

ad_domain = mydomain

krb5_realm = MYDOMAIN

realmd_tags = manages-system joined-with-adcli 

cache_credentials = True

id_provider = ad

krb5_store_password_if_offline = True

default_shell = /bin/bash

ldap_id_mapping = True

use_fully_qualified_names = False

fallback_homedir = /home/%u@%d

access_provider = ad

ldap_user_ssh_public_key = altSecurityIdentities

I'm really hoping that someone here has the answer, I've searched many many threads and have not been able to crack this nut

If group consists of single word then it should be sufficient to add following record to /etc/sudoers file:

%ActiveDirectoryUserGroup ALL=(ALL:ALL) ALL

If group contain spaces then record should look like:

%Domain Users ALL=(ALL:ALL) ALL

%Domain Admins ALL=(ALL:ALL) NOPASSWD:ALL

%Linux Admins ALL=(ALL:ALL) NOPASSWD:ALL

Here "Domain Users" , "Domain Admins", "Linux Admins" is group name in Active Directory