Аутентификация Linux-сервера через Windows AD Domain Controller

Данное описание применялось на дистрибутиве CentOS/RHEL 5 в связке с Windows 2003 Server.


Для начала установим необходимые для работы пакеты

# yum install -y krb5-workstation samba-common

Подправим файл /etc/hosts, чтобы он имел примерно такой вид:

# vi /etc/hosts
127.0.0.1 localhost.localdomain localhost
10.10.2.91 vm01.organization.local vm01
10.10.2.1 windows.organization.local windows

Теперь настроим Керберос для добавления linux-сервера в windows-домен

# vi /etc/krb5.conf
[logging]
default = FILE:/var/log/krb5libs.log
kdc = FILE:/var/log/krb5kdc.log
admin_server = FILE:/var/log/kadmind.log

[libdefaults]javascript:void(0)
default_realm = ORGANIZATION.LOCAL
dns_lookup_realm = false
dns_lookup_kdc = false
ticket_lifetime = 24h
forwardable = yes

[realms]
ORGANIZATION.LOCAL = {
kdc = windows.organization.local:88
admin_server = windows.organization.local:749
default_domain = organization.local
}

[domain_realm]
.organization.local = ORGANIZATION.LOCAL
organization.local = ORGANIZATION.LOCAL

[kdc]
profile = /var/kerberos/krb5kdc/kdc.conf

[appdefaults]
pam = {
debug = false
ticket_lifetime = 36000
renew_lifetime = 36000
forwardable = true
krb4_convert = false
}

# kinit administrator@ORGANIZATION.LOCAL
Password for administrator@ORGANIZATION.LOCAL:

Минимальная настройка samba

[root@vm01 ~]#vi /etc/samba/smb.conf
[global]
workgroup = ORGANIZATIONAL
netbios name = VM01
server string = VM01 Samba Server
security = ads
encrypt passwords = yes
realm = ORGANIZATIONAL.LOCAL
password server = windows.organization.local
winbind enum users = yes
winbind enum groups = yes
winbind cache time = 1800
winbind use default domain = yes
winbind refresh tickets = yes
idmap uid = 10000-20000
idmap gid = 10000-20000
template shell = /bin/bash
template homedir = /home/%U
printing = 
load printers = no

Входим в домен

# net ads join -U administrator
administrator's password:
Using short domain name -- ORGANIZATION
Joined 'VM01' to realm 'ORGANIZATION.LOCAL'

Добавить описание pam_winbind.so модуля для аутентификации в системе. Модуль pam_mkhomedir.so для автоматического создания домашней директории при первом присоединении пользователя.

vim /etc/pam.d/system-auth
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
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
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
session     required      pam_mkhomedir.so skel=/etc/skel/ umask=0022

Настраиваем nsswitch, для того чтобы он мог использовать данные (о пользователях и групппах) AD с помощью winbind-сервиса и стартуем сервис

vim /etc/nsswitch.conf
passwd: files winbind
shadow: files
group: files winbind
 
/etc/init.d/winbind start
Starting Winbind services: [ OK ]
chkconfig winbind on

Ограничиваем доступ к ssh-сервису

vim /etc/ssh/sshd_config
PermitRootLogin no
AllowGroups admins
 
/etc/init.d/sshd restart
Stopping sshd:                                             [  OK  ]
Starting sshd:                                             [  OK  ]