Ubuntu 18.04
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Samba : Samba AD DC : Configure DC
2018/06/26
 
Configute Samba Active Directory Domain Controller.
This example configures on the environment bellow.
Domain name : SMB01
Realm : SRV.WORLD
Hostname : smb.srv.world
[1] Install required packages.
root@smb:~#
apt -y install samba krb5-config winbind smbclient
# set Realm

 +------------------+ Configuring Kerberos Authentication +------------------+
 | When users attempt to use Kerberos and specify a principal or user name   |
 | without specifying what administrative Kerberos realm that principal      |
 | belongs to, the system appends the default realm.  The default realm may  |
 | also be used as the realm of a Kerberos service running on the local      |
 | machine.  Often, the default realm is the uppercase version of the local  |
 | DNS domain.                                                               |
 |                                                                           |
 | Default Kerberos version 5 realm:                                         |
 |                                                                           |
 | SRV.WORLD________________________________________________________________ |
 |                                                                           |
 |                                  <Ok>                                     |
 |                                                                           |
 +---------------------------------------------------------------------------+
# specify the hostname

 +------------------+ Configuring Kerberos Authentication +------------------+
 | Enter the hostnames of Kerberos servers in the SRV.WORLD Kerberos         |
 | realm separated by spaces.                                                |
 |                                                                           |
 | Kerberos servers for your realm:                                          |
 |                                                                           |
 | smb.srv.world____________________________________________________________ |
 |                                                                           |
 |                                  <Ok>                                     |
 |                                                                           |
 +---------------------------------------------------------------------------+
 
# specify the hostname

 +------------------+ Configuring Kerberos Authentication +------------------+
 | Enter the hostname of the administrative (password changing) server for   |
 | the SRV.WORLD Kerberos realm.                                             |
 |                                                                           |
 | Administrative server for your Kerberos realm:                            |
 |                                                                           |
 | smb.srv.world____________________________________________________________ |
 |                                                                           |
 |                                  <Ok>                                     |
 |                                                                           |
 +---------------------------------------------------------------------------+
[2] Configure Samba AD DC.
# rename or remove the default config

root@smb:~#
mv /etc/samba/smb.conf /etc/samba/smb.conf.org

root@smb:~#
samba-tool domain provision

# specify Realm
Realm [SRV.WORLD]: 
# specify Domain name
 Domain [SRV]: SMB01 
# Enter with default because it sets DC
 Server Role (dc, member, standalone) [dc]:
# Enter with default because it uses Built-in DNS
 DNS backend (SAMBA_INTERNAL, BIND9_FLATFILE, BIND9_DLZ, NONE) [SAMBA_INTERNAL]:
# if you set DNS forwarder, specify it, if not, specify [none]
 DNS forwarder IP address (write 'none' to disable forwarding) [127.0.0.53]: 10.0.0.10
# set admin password
# Do not set trivial password, if you input it, configuration wizard shows error and stops
Administrator password:
Retype password:
Looking up IPv4 addresses
Looking up IPv6 addresses
No IPv6 address will be assigned
Setting up share.ldb
Setting up secrets.ldb
Setting up the registry
Setting up the privileges database
Setting up idmap db
Setting up SAM db
Setting up sam.ldb partitions and settings
Setting up sam.ldb rootDSE
Pre-loading the Samba 4 and AD schema
Adding DomainDN: DC=srv,DC=world
Adding configuration container
Setting up sam.ldb schema
Setting up sam.ldb configuration data
Setting up display specifiers
Modifying display specifiers
Adding users container
Modifying users container
Adding computers container
Modifying computers container
Setting up sam.ldb data
Setting up well known security principals
Setting up sam.ldb users and groups
Setting up self join
Adding DNS accounts
Creating CN=MicrosoftDNS,CN=System,DC=srv,DC=world
Creating DomainDnsZones and ForestDnsZones partitions
Populating DomainDnsZones and ForestDnsZones partitions
Setting up sam.ldb rootDSE marking as synchronized
Fixing provision GUIDs
A Kerberos configuration suitable for Samba AD has been generated at /var/lib/samba/private/krb5.conf
Once the above files are installed, your Samba AD server will be ready to use
Server Role:           active directory domain controller
Hostname:              smb
NetBIOS Domain:        SMB01
DNS Domain:            srv.world
DOMAIN SID:            S-1-5-21-4176899714-252447280-935874687

root@smb:~#
cp /var/lib/samba/private/krb5.conf /etc/

root@smb:~#
systemctl stop smbd nmbd winbind systemd-resolved

root@smb:~#
systemctl disable smbd nmbd winbind systemd-resolved

root@smb:~#
systemctl unmask samba-ad-dc

Removed /etc/systemd/system/samba-ad-dc.service.
# remove the link of resolv.conf and create new one

root@smb:~#
ll /etc/resolv.conf

lrwxrwxrwx 1 root root 39 Apr 27 10:30 /etc/resolv.conf -> ../run/systemd/resolve/stub-resolv.conf
root@smb:~#
rm /etc/resolv.conf

root@smb:~#
vi /etc/resolv.conf
# replace the domain name to your own environment

domain srv.world
nameserver 127.0.0.1
root@smb:~#
systemctl start samba-ad-dc

root@smb:~#
systemctl enable samba-ad-dc

[3] Confirm doman level and add a Domain user.
# confirm doman level

root@smb:~#
samba-tool domain level show

Domain and forest function level for domain 'DC=srv,DC=world'

Forest function level: (Windows) 2008 R2
Domain function level: (Windows) 2008 R2
Lowest function level of a DC: (Windows) 2008 R2

# add a donain user

root@smb:~#
samba-tool user create ubuntu

New Password:  
# set password

Retype Password:
User 'ubuntu' created successfully
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