AD Samba4

Samba 4 Active Directory DC

Installing Samba 4 onto CentOS

• Install a minimal install of CentOS
• change the hostname

hostname samba

• manually edit or add network-scripts if not there

cd /etc/sysconfig/network-scripts/
vi ifcfg-eth0

• Make sure these options are included

DEVICE=eth0
HWADDR=**:**:**:**:**:**
TYPE=ETHERNET
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=dhcp

• restart the network

service network restart

• run yum update
• install vim or an editor of your choice, vi comes included with minimal
• SELinux must be disabled:

vim /etc/sysconfig/selinux

• change "SELINUX=enforcing" to "SELINUX=disabled"
• restart the computer

shutdown -r now

• install a couple packages that will be required for building and installing samba

yum install glibc glibc-devel gcc python* libacl-devel krb5-server krb5-workstation krb5-libs pam_krb5 make gnutls-devel openssl-devel bind bind-libs bind-utils

• install git, git will be used to download samba

yum install git-core
git clone http://gitweb.samba.org/samba.git ~/samba-master

• reboot server so all packages and updates are applied

shutdown -r now

• login and build the samba install

cd ~/samba-master
./configure --enable-debug --enable-selftest

• if it completes successfully

make
make install

Enabling Samba 4 as DC

• run command

/usr/local/samba/bin/samba-tool domain provision

• the domain-provision tool should pick all defaults automatically, however they can be changed to your liking
• once the provision tool has finished successfully restart the server

shutdown -r now

• once system has started enable samba 4 and add it start at boot

/usr/local/samba/sbin/samba
vim /etc/rc.d/rc.local

• append "/usr/local/samba/sbin/samba" without quotations to the end of the file and then save
• samba version as well as samba client version can be checked using the following commands

/usr/local/samba/sbin/samba -V
/usr/local/samba/bin/smbclient --version

Configuring DNS

• not sure if needed, have not tested without DNS forwarding
• DNS forwarding was set up on the domain provision ing using the samba-tool

cat /usr/local/samba/etc/smb.conf

• there should be a line under "[global]" that says "dns forwarder = ***.***.***.***", if not it was not enabled during domain provisioning
• edit resolv.conf

vim /etc/resolv.conf

• edit to look like:

domain mydomain.com
nameserver 128.***.***.** 

• where "128.***.***.***" is the ipaddress of the centos server
• next go back and edit ifcfg-eth0 in network-scripts

vim /etc/sysconfig/network-scripts/ifcfg-eth0

• change the file to look like this

DEVICE="eth0"
BOOTPROTO="none"
DEFROUTE="yes"
DNS1="128.***.***.**" #this is host ipaddress
GATEWAY=128.**.***.*
HWADDR="86:C4:C1:0D:29:AD"
IPADDR="128.***.***.**"
IPV4_FAILURE_FATAL="yes"
IPV6INIT="no"
NAME="System eth0"
NM_CONTROLLED="yes"
ONBOOT="yes"
PREFIX="24"
TYPE="Ethernet"

• reboot so that all changes may take effect

shutdown -r now

• login and test that the DNS is working properly

host -t SRV _ldap._tcp.mydomain.com

• where mydomain.com is then name of the domain you are on
• output should look like, where samba is the hostname of your server

_ldap._tcp.mydomain.com has SRV record 0 100 389 samba.mydomain.com

• test with

host -t SRV _kerberos._udp.mydomain.com

• output

_kerberos._udp.mydomain.com has SRV record 0 100 88 samba.mydomain.com

• last test

host -t A samba.mydomain.com.

• output should return your ip adddress

samba.mydomain.com has address 192.168.0.2

• if test did not produce those outputs DNS has not been configured properly

Kerberos

• make a backup of original kerberos file and replace it with the copy generated by samba

mv /etc/krb5.conf /etc/krb5.conf.bak
cp /usr/local/samba/share/setup/krb5.conf /etc/krb5.conf

• edit the new krb5.conf file and change the ${REALM} variable to the realm selected during domain provisioning

vim /etc/krb5.conf

• test Kerberos using the kinit command

kinit administrator@MYDOMAIN.COM

• if Kerberos is working you will be asked for your password
• verify that it is working by running klist, output should look something along the lines of

Ticket cache: FILE:/tmp/krb5cc_0
Default principal: administrator@MYDOMAIN.COM

Valid starting Expires Service principal
07/25/13 15:23:33 07/26/13 1:23:33 krbtgt/MYDOMAIN.COM@MYDOMAIN.COM
renew until 07/26/13 15:23:31