Join in Active Directory Domain2021/08/19

Join in Windows Active Directory Domain with Realmd.

This tutorial needs Windows Active Directory Domain Service in your LAN.
This example shows to configure on the environment below.

Domain Server	: Windows Server 2019
Domain Name	: srv.world
Hostname	: fd3s.srv.world
NetBIOS Name	: FD3S01
Realm	: SRV.WORLD

[1]

Install some required packages.

root@dlp:~#

apt -y install realmd sssd sssd-tools libnss-sss libpam-sss adcli samba-common-bin oddjob oddjob-mkhomedir packagekit

[2]	Join in Windows Active Directory Domain.

# change DNS settings to refer to AD

root@dlp:~#

vi /etc/resolv.conf

domain srv.world
search srv.world
nameserver 10.0.0.100

# discover Active Directory domain

root@dlp:~#

realm discover SRV.WORLD

srv.world
  type: kerberos
  realm-name: SRV.WORLD
  domain-name: srv.world
  configured: no
  server-software: active-directory
  client-software: sssd
  required-package: sssd-tools
  required-package: sssd
  required-package: libnss-sss
  required-package: libpam-sss
  required-package: adcli
  required-package: samba-common-bin

# join in Active Directory domain

root@dlp:~#

realm join SRV.WORLD

Password for Administrator:

# AD Administrator password

# verify it's possible to get an AD user info or not

root@dlp:~#

id Serverworld@srv.world

uid=1109001103(serverworld@srv.world) gid=1109000513(domain users@srv.world) groups=1109000513(domain users@srv.world)

# change setting if need

root@dlp:~#

vi /etc/pam.d/common-session

# add to the end (create Home Dir automatically when initial login)

session optional        pam_mkhomedir.so skel=/etc/skel umask=077

# verify it's possible to login as an AD user or not

root@dlp:~#

exit

logout

Debian GNU/Linux 11 dlp.srv.world ttyS0

dlp login: serverworld@srv.world
Password:
Linux dlp.srv.world 5.10.0-8-amd64 #1 SMP Debian 5.10.46-4 (2021-08-03) x86_64

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Creating directory '/home/serverworld@srv.world'.
serverworld@srv.world@dlp:~$     # logined

[3]	If you'd like to omit domain name for AD user, configure like follows.

root@dlp:~#

vi /etc/sssd/sssd.conf

# line 16 : change

use_fully_qualified_names =

False

root@dlp:~#

systemctl restart sssd

root@dlp:~#

id Administrator

uid=1109000500(administrator) gid=1109000513(domain users) groups=1109000513(domain users),1109000520(group policy creator owners),1109000518(schema admins),1109000512(domain admins),1109000519(enterprise admins),1109000572(denied rodc password replication group)

[4]

AD users UID/GID are asigned randomly, but if you'd like to assign fixed UID/GID, configure like follows.

Add UNIX attributes to AD accounts first, refer to here ([2] and later).
This example is based on the environment AD accounts have [uidNumber/gidNumber] attributes.

Next, change SSSD settings on Debian Server.

root@dlp:~#

vi /etc/sssd/sssd.conf

# line 17 : change

ldap_id_mapping =

False

# add to the end

ldap_user_uid_number = uidNumber
ldap_user_gid_number = gidNumber

# clear cache and restart sssd

root@dlp:~#

rm -f /var/lib/sss/db/*

root@dlp:~#

systemctl restart sssd

root@dlp:~#

id serverworld

uid=5000(serverworld) gid=5000 groups=5000

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