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{{Version|UCS=3.0}}
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Documentation about integrating Ubuntu clients into a UCS 3 domain can be found in the [http://docs.univention.de/domain-3.2.html UCS extended documentation]
  
This guide describes the inclusion of Ubuntu into an UCS 3 domain. This configuration has been tested with Ubuntu 12.04 LTS and Kubuntu 12.04 LTS.
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Documentation about integrating Ubuntu clients into a UCS 4 domain can be found in the [http://docs.univention.de/domain-4.1.html UCS extended documentation]
 
 
= LDAP and SSL configuration =
 
After Ubuntu has been installed, the default basis configuration must be done. For an easy use, the default configuration of the UCS Master should be copied to the Ubuntu system, for example:
 
<source lang=bash>
 
export MASTER_IP=192.168.0.3
 
 
 
mkdir /etc/univention
 
ssh ${MASTER_IP} ucr shell | grep -v ^hostname= >/etc/univention/ucr_master
 
echo "master_ip=${MASTER_IP}" >>/etc/univention/ucr_master
 
. /etc/univention/ucr_master
 
 
 
echo "${MASTER_IP} ${ldap_master}" >>/etc/hosts
 
</source>
 
 
 
The anonymous LDAP search is disabled by default in UCS 3. The Ubuntu client needs an account in the UCS 3 domain to get read access to the LDAP directory.
 
<source lang=bash>
 
# Set some environment variables
 
. /etc/univention/ucr_master
 
 
 
# Download the SSL certificate
 
mkdir -p /etc/univention/ssl/ucsCA/
 
wget -O /etc/univention/ssl/ucsCA/CAcert.pem http://${ldap_master}/ucs-root-ca.crt
 
 
 
# import the UCR variables into the scope of the script
 
eval "$(ucr shell)"
 
 
 
# Create an account and save the password
 
password="$(< /dev/urandom tr -dc A-Za-z0-9_ | head -c8)"
 
if ([ $version_version == 3.0 ] && [ $version_patchlevel -ge 2 ]); then
 
    ssh root@${ldap_master} udm computers/ubuntu create --position cn=computers,${ldap_base} \
 
        --set name=$(hostname) --set password="${password}"
 
else
 
    ssh root@${ldap_master} udm computers/managedclient create --position cn=computers,${ldap_base} \
 
        --set name=$(hostname) --set password="${password}"
 
fi
 
echo "${password}" > /etc/ldap.secret
 
 
 
# Create ldap.conf
 
cat >/etc/ldap/ldap.conf <<__EOF__
 
TLS_CACERT /etc/univention/ssl/ucsCA/CAcert.pem
 
URI ldap://$ldap_master:7389
 
BASE $ldap_base
 
__EOF__
 
</source>
 
 
 
= System Security Services Daemon (SSSD) =
 
SSSD provides a set of daemons to manage access to remote directories and  authentication mechanisms.
 
 
 
<source lang=bash>
 
# Set some environment variables
 
. /etc/univention/ucr_master
 
 
 
# Install SSSD based configuration
 
DEBIAN_FRONTEND=noninteractive apt-get install sssd
 
 
 
 
 
# Create sssd.conf
 
cat >/etc/sssd/sssd.conf <<__EOF__
 
[sssd]
 
config_file_version = 2
 
reconnection_retries = 3
 
sbus_timeout = 30
 
services = nss, pam, sudo
 
domains = $kerberos_realm
 
 
 
[nss]
 
reconnection_retries = 3
 
 
 
[pam]
 
reconnection_retries = 3
 
 
 
[domain/$kerberos_realm]
 
auth_provider = krb5
 
krb5_kdcip = ${master_ip}
 
krb5_realm = ${kerberos_realm}
 
krb5_server = ${ldap_master}
 
krb5_kpasswd = ${ldap_master}
 
id_provider = ldap
 
ldap_uri = ldap://${ldap_master}:7389
 
ldap_search_base = ${ldap_base}
 
ldap_tls_reqcert = never
 
ldap_tls_cacert = /etc/univention/ssl/ucsCA/CAcert.pem
 
cache_credentials = true
 
enumerate = true
 
ldap_default_bind_dn = cn=$(hostname),cn=computers,${ldap_base}
 
ldap_default_authtok_type = password
 
ldap_default_authtok = $(cat /etc/ldap.secret)
 
__EOF__
 
chmod 600 /etc/sssd/sssd.conf
 
 
 
# Install auth-client-config
 
DEBIAN_FRONTEND=noninteractive apt-get install auth-client-config
 
 
 
# Create an auth config profile for sssd
 
cat > /etc/auth-client-config/profile.d/sss <<__EOF__
 
[sss]
 
nss_passwd=    passwd:        compat sss
 
nss_group=      group:          compat sss
 
nss_shadow=    shadow:        compat
 
nss_netgroup=  netgroup:      nis
 
 
 
pam_auth=      auth    [success=3 default=ignore]      pam_unix.so nullok_secure try_first_pass
 
                auth    requisite                      pam_succeed_if.so uid >= 500 quiet
 
                auth    [success=1 default=ignore]      pam_sss.so use_first_pass
 
                auth    requisite                      pam_deny.so
 
                auth    required                        pam_permit.so
 
 
 
pam_account=    account required                                        pam_unix.so
 
                account sufficient                                      pam_localuser.so
 
                account sufficient                                      pam_succeed_if.so uid < 500 quiet
 
                account [default=bad success=ok user_unknown=ignore]    pam_sss.so
 
                account required                                        pam_permit.so
 
 
 
pam_password=  password        sufficient      pam_unix.so obscure sha512
 
                password        sufficient      pam_sss.so use_authtok
 
                password        required        pam_deny.so
 
 
 
pam_session=    session required                        pam_mkhomedir.so skel=/etc/skel/ umask=0077
 
                session optional                        pam_keyinit.so revoke
 
                session required                        pam_limits.so
 
                session [success=1 default=ignore]      pam_sss.so
 
                session required                        pam_unix.so
 
__EOF__
 
auth-client-config -n -a -p sss
 
 
 
# Start sssd
 
service sssd start
 
</source>
 
 
 
The commands <tt>getent passwd</tt> and <tt>getent group</tt> should now also display all users and groups of the UCS 3 domain.
 
 
 
= Login =
 
To allow the users the login the home directory should be created by the login.
 
<source lang=bash>
 
cat >/usr/share/pam-configs/ucs_mkhomedir <<__EOF__
 
Name: activate mkhomedir
 
Default: yes
 
Priority: 900
 
Session-Type: Additional
 
Session:
 
        required                        pam_mkhomedir.so umask=0022 skel=/etc/skel
 
__EOF__
 
 
 
DEBIAN_FRONTEND=noninteractive pam-auth-update
 
</source>
 
 
 
The users should be added to some groups during the login, for example:
 
<source lang=bash>
 
echo '*;*;*;Al0000-2400;audio,cdrom,dialout,floppy,plugdev,adm' >>/etc/security/group.conf
 
 
 
cat >>/usr/share/pam-configs/local_groups <<__EOF__
 
Name: activate /etc/security/group.conf
 
Default: yes
 
Priority: 900
 
Auth-Type: Primary
 
Auth:
 
        required                        pam_group.so use_first_pass
 
__EOF__
 
 
 
DEBIAN_FRONTEND=noninteractive pam-auth-update
 
</source>
 
 
 
By default Ubuntu (12.04 LTS) shows only local users at the login screen. After adding the following line a user name can be added:
 
<source lang=bash>
 
# Add a field for a user name
 
echo "greeter-show-manual-login=true" >>/etc/lightdm/lightdm.conf
 
 
 
# Optional: Disable the user selection at the login screen
 
echo "greeter-hide-users=true" >>/etc/lightdm/lightdm.conf
 
</source>
 
 
 
With these settings the login for domain members should be possible.
 
 
 
= Kerberos integration =
 
An UCS 3 domain provides a kerberos domain. The Ubuntu client should use the UCS 3 DNS server, because Kerberos relies heavily on DNS. The following steps show an example configuration
 
<source lang=bash>
 
# Set some environment variables
 
. /etc/univention/ucr_master
 
 
 
# Install required packages
 
DEBIAN_FRONTEND=noninteractive apt-get install heimdal-clients
 
 
 
# Default krb5.conf
 
cat >/etc/krb5.conf <<__EOF__
 
[libdefaults]
 
    default_realm = $kerberos_realm
 
    kdc_timesync = 1
 
    ccache_type = 4
 
    forwardable = true
 
    proxiable = true
 
 
 
[realms]
 
$kerberos_realm = {
 
  kdc = $MASTER_IP $ldap_master
 
  admin_server = $MASTER_IP $ldap_master
 
}
 
__EOF__
 
 
 
# Stop and disable the avahi daemon
 
service avahi-daemon stop
 
sed -i 's|start on (|start on (never and |' /etc/init/avahi-daemon.conf
 
 
 
# Synchronize the time with the UCS system
 
ntpdate $ldap_master
 
 
 
# Test Kerberos
 
kinit Administrator
 
 
 
# This login shouldn't ask for a password
 
ssh Administrator@$ldap_master ls /etc/univention
 
 
 
# Destroy the kerberos ticket
 
kdestroy
 
</source>
 
 
 
= Limitations =
 
The password change at the graphical login screen is not possible. The password can be changed via ''kpasswd'' or via the UMC module password change.
 
 
 
= Links =
 
* https://help.ubuntu.com/community/LDAPClientAuthentication
 
* https://help.ubuntu.com/community/SingleSignOn
 
* https://help.ubuntu.com/community/PamCcredsHowto
 
  
 
[[Category:EN]]
 
[[Category:EN]]
 
[[Category:Other Operating Systems]]
 
[[Category:Other Operating Systems]]

Latest revision as of 13:12, 2 June 2016

Documentation about integrating Ubuntu clients into a UCS 3 domain can be found in the UCS extended documentation

Documentation about integrating Ubuntu clients into a UCS 4 domain can be found in the UCS extended documentation

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