1 Centos 6.5 join Windows Domain and Kerberos authentication

This is my note for configure Linux intergrade windows domain authentication with Kerberos

 

Package Require

• yum install samba
• yum install krb5-server
• yum install krb5-workstation
• yum install samba-winbind
• yum install ntpdate    --> This is required for sync time
• yum install cifs-utils

 

Setup the Host Name on Linux

Setup the host name in /etc/sysconfig/network

Setup network connection on Linux

Setup the host name in /etc/sysconfig/network-scripts/ifcfg-eth0

setup hostname /etc/hosts

This is the Linux network looks like

Before we start configuration, we need to make sure the Linux and Windows can ping each other

Linux

IP : 192.168.126.128

Hostname : NOSQL1

Windows

IP : 192.168.126.1

Hostname : SGC

DOMAIN: SGC.stargate.com

 

Configure Samba

configure /etc/samba/smb.conf

[global]

   workgroup = STARGATE  # For Win2000 and older

   password server = SGC.stargate.com # DC hostname

   realm = STARGATE.COM # Domain

   security = ads # Activity Directory

   idmap config * : range = 16777216-33554431

   template shell = /bin/bash  # Default Shell

   winbind use default domain = true # When set true, we can log in as loginname, when set false, we need to login as loginid@domainname

   winbind offline logon = false

   template homedir = /mnt/samba/%u

   server string = stargate Samba Server Version %v

   netbios name = NOSQL1

  # Below are all default value

   log file = /var/log/samba/log.%m

   max log size = 50

   passdb backend = tdbsam

   encrypt passwords = yes

   load printers = yes

   cups options = raw

[homes]

        comment = Home Directories

        browseable = no

        writable = yes

[printers]

        comment = All Printers

        path = /var/spool/samba

        browseable = no

        guest ok = no

        writable = no

        printable = yes

mkdir /mnt/samba

update /etc/fstab

//sgc/C$/Users /mnt/samba cifs sec=krb5i,noserverino,nounix,iocharset=utf8,rw,dir_mode=0777,file_mode=0666

 

Configure KDC

configure /etc/krb5.conf  Configure file is case sensitive

[logging]

 default = FILE:/var/log/krb5libs.log

 kdc = FILE:/var/log/krb5kdc.log

 admin_server = FILE:/var/log/kadmind.log

[libdefaults]

 default_realm = STARGATE.COM

 dns_lookup_realm = false

 dns_lookup_kdc = false

 ticket_lifetime = 24h

 renew_lifetime = 7d

 forwardable = true

[realms]

 STARGATE.COM = {

  kdc = SGC.STARGATE.COM

  admin_server = SGC.STARGATE.COM:749

  default_domain = STARGATE.COM

  kdc = SGC.stargate.com

 }

[domain_realm]

 .example.com = STARGATE.COM

 example.com = STARGATE.COM

 stargate.com = STARGATE.COM

 .stargate.com = STARGATE.COM

configure /var/kerberos/krb5kdc/kdc.conf

[kdcdefaults]

 kdc_ports = 88

 kdc_tcp_ports = 88

[realms]

 STARGATE.COM = {

  #master_key_type = aes256-cts

  acl_file = /var/kerberos/krb5kdc/kadm5.acl

  dict_file = /usr/share/dict/words

  admin_keytab = /var/kerberos/krb5kdc/kadm5.keytab

  supported_enctypes = aes256-cts:normal aes128-cts:normal des3-hmac-sha1:normal arcfour-hmac:normal des-hmac-sha1:normal des-cbc-md5:normal des-cbc-crc:normal

 }

Restart samba

service smb start

chkconfig smb on

 

Sync time

ntpdate  sgc

KINIT

Join Domain

net rpc join –U PO

After join the domain, you can see the host show up in the windows AD.

If you encounter the error :  Unable to find a suitable server for domain
That is because the iptables

We can temporary stop the iptables.

Configure Winbind authentication

configure /etc/nsswitch.conf

Configure PAM

configure /etc/pam.d/system-auth

Log path for trouble shooting authentication error /var/log/audit/audit.log

auth         sufficient    pam_winbind.so

account      sufficient    pam_winbind.so

password     sufficient    pam_winbind.so

session      sufficient    pam_winbind.so

After the pam setting is complete  we need to restart winbind

service winbind start

chkconfig winbind on

We can also use authconfig-tui to configure the PAM .

This is what my system-auth looks like after authconfig-tui

auth        required      pam_env.so

auth        sufficient    pam_unix.so nullok try_first_pass

auth        requisite     pam_succeed_if.so uid >= 500 quiet

auth        sufficient    pam_winbind.so use_first_pass

auth        required      pam_deny.so

account     required      pam_unix.so broken_shadow

account     sufficient    pam_succeed_if.so uid < 500 quiet

account     [default=bad success=ok user_unknown=ignore] pam_winbind.so

account     required      pam_permit.so

password    requisite     pam_cracklib.so try_first_pass retry=3 type=

password    sufficient    pam_unix.so md5 shadow nullok try_first_pass use_authtok

password    sufficient    pam_winbind.so use_authtok

password    required      pam_deny.so

session     optional      pam_keyinit.so revoke

session     required      pam_limits.so

session     [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid

session     required      pam_unix.so

~

Test AD login

List all the account on the AD:  wbinfo -u

Check the user : id

You can see the id belong to the domain group

Login as domain account

Other errors

No DNS domain configured for nosql2. Unable to perform DNS Update.
DNS update failed!

To fix this, add the nosql2 in the DC’s DNS record:

 

Reference

http://wiki.centos.org/zh-tw/TipsAndTricks/WinbindADS