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Example FAST 3 - Client with PAM + SSSD for Kerberos Auth , LDAP user information and Kerberos Password

Overview

In this model, starting from example one, we will see how to make a more secure authentication in the system using the best of Kerberos and Ldap technologies.

Using this a Client for simulate a school computer.

For this example, in the Client we will see how the System-Auth works with these two technologies, and we will perform a series of checks to make sure it works correctly.

Requisites

  • Docker Engine working on the system
  • Run this with user with permisions

Note:This Script only tested in Fedora 24

How To Deploy

If you want to see how it works in your computer , follow this steps.

  • Download the start script start_example3.sh
  • Run it /bin/bash start_example3.sh
  • Wait to finish the installation

Try it

We gonna log with user in the Client , for this you need enter into the Client Container.

docker exec --interactive --tty client bash

Time to try how works. First we gonna log with user05 , he have LDAP Entry but not Kerberos , so he doesnt able to System Auth the Ldap Password is jupiter

su user05

Now we gonna try log with user01 with kuser01 password. This one have Kerberos entry and LDAP one too. He will enter inside the user.

su user01

Now try again to perform some checks:

  • Check if we got the properly user ticket
    • klist
  • Check if LDAP server recognize this
    • ldapwhoami -ZZ
  • Now , do a search
    • ldapsearch -ZZ cn=user01    

Now we have a way to System Authentification more secure than only LDAP.

If you preffer long explanation , you have How to configure for perform Kerberos System Auth

#!/bin/bash
# Author: Pedro Romero Aguado
# Date: 04/05/2017
# Script for Start Network and the Docker Containers Needed for Example
# If you want check the logs , its posible in $LOG_FILE variable

#SET LOG FILE
LOG_FILE="/dev/stdout"
#SET NETWORK NAME
DOCKER_NETWORK="ldap"
#SET CONTAINERS AND IMAGES NAMES
CONTAINER_LDAP="ldap"
CONTAINER_KERBEROS="kerberos"
CONTAINER_CLIENT="client"
IMAGE_LDAP="antagme/ldap_sssd"
IMAGE_KERBEROS="antagme/kerberos:supervisord"
IMAGE_CLIENT="antagme/client:pam_tls"

#----------------------------------------------------------------------#

# Stop all containers with this names if this is running
echo " STOPING CONTAINERS"
docker stop $CONTAINER_LDAP &> $LOG_FILE
docker stop $CONTAINER_KERBEROS &>> $LOG_FILE
docker stop $CONTAINER_CLIENT &>> $LOG_FILE

# Remove all containers with this names
echo " REMOVING CONTAINERS"
docker rm $CONTAINER_LDAP  &>> $LOG_FILE
docker rm $CONTAINER_KERBEROS  &>> $LOG_FILE
docker rm $CONTAINER_CLIENT  &>> $LOG_FILE

# Remove Images of all Containers?
echo " REMOVING IMAGES"
docker rmi $IMAGE_LDAP  &>> $LOG_FILE
docker rmi $IMAGE_KERBEROS  &>> $LOG_FILE
docker rmi $IMAGE_CLIENT  &>> $LOG_FILE

#REMOVE IF EXISTS 
echo " Deleting Network"
docker network rm $DOCKER_NETWORK &>> $LOG_FILE

#CREATE NETWORK
echo " Creating Network"
docker network create --subnet 172.18.0.0/16 --driver bridge \
	$DOCKER_NETWORK &>> $LOG_FILE \
	&& echo " Docker Network $DOCKER_NETWORK Created"

# Run Containers
## Docker LDAP
echo " RUNNING CONTAINERS IT CAN TAKE A WHILE...WAIT PLEASE!!!"

docker run --name $CONTAINER_LDAP \
	--hostname ldap.edt.org --net $DOCKER_NETWORK \
	--ip 172.18.0.2  --detach $IMAGE_LDAP &>> $LOG_FILE \
	&& echo " Ldap Container Created... %33 Completed"

## Docker Kerberos

docker run --name $CONTAINER_KERBEROS \
	--hostname kserver.edt.org --net $DOCKER_NETWORK \
	--ip 172.18.0.3  --detach  $IMAGE_KERBEROS &>> $LOG_FILE \
	&& echo " Kerberos Container Created ... %66 Completed"
	
## Docker Client
docker run --name $CONTAINER_CLIENT \
	--hostname client.edt.org --net $DOCKER_NETWORK \
	--ip 172.18.0.8  --detach  $IMAGE_CLIENT &>> $LOG_FILE \
	&& echo " Client Container Created ... %100 Completed"
	
echo -e " Thanks For the Wait"'!!!'" \n For Access inside Container \
	\n docker exec --interactive --tty [Container Name] bash "