Enterprise Linux Networking Services (GL275)

Module 1: Securing Services

• Xinetd

• Xinetd connection limiting and access control

• Xinetd: resource limits, redirection, logging

• TCP wrappers

• The /etc/hosts.allow and /etc/hosts.deny files

• /etc/hosts.{allow,deny} shortcuts

• Advanced TCP wrappers

• FirewallD

• Netfilter: stateful packet filter firewall

• Netfilter concepts

• Using the iptables command

• Netfilter rule syntax l

• Targets

• Common match_specs

• Extended packet matching modules

• Connection tracking

Lab Tasks

• Securing xinetd services

• Enforcing security policy with xinetd

• Securing services with Netfilter

• FirewallD

• Troubleshooting practice

 

Module 2: SELINUX and LSM

• AppArmor

• SELinux security framework

• Choosing an SELinux policy

• SELinux commands

• SELinux booleans

• SELinux policy tools

Lab Tasks

• Exploring AppArmor modes

• SELinux file contexts

 

Module 3: DNS Concepts

• Naming services

• DNS - A Better Way

• The domain name space

• Delegation and zones

• Server roles

• Resolving names

• Resolving IP addresses

• Basic BIND administration

• Configuring the resolver

• Testing Resolution

Lab Tasks

• Configuring a slave name server

 

Module 4: Configuring Bind

• BIND configuration files

• named.conf syntax

• named.conf options block

• Creating a sitewide cache

• rndc key configuration

• Zones in named.conf

• Zone database file syntax

• Start of authority

• A, AAAA, and PTR - Address & Pointer Records

• Name Server

• TXT, CNAME, and MX - text, alias, and mail host

• SRV - SRV service records

• Abbreviations and gotchas

• $GENERATE, $ORIGIN, and $INCLUDE

Lab Tasks

• Use rndc to control named

• Configuring BIND zone files

 

Module 5: Creating DNS Hierarchies

• Subdomains and delegation

• Subdomains

• Delegating zones

• in-addr.arpa. delegation

• Issues with in-addr.arpa.

• RFC2317 and in-addr.arpa.

Lab Tasks

• Create a subdomain in an existing domain

• Subdomain delegation

 

Module 6: Advanced Bind DNS Features

• Address match lists and ACLs

• Split namespace with views

• Restricting queries

• Restricting zone transfers

• Running BIND in a chroot

• Dynamic DNS concepts

• Allowing dynamic DNS updates

• DDNS administration with nsupdate

• Common problems

• Securing DNS With TSIG

Lab Tasks

• Configuring dynamic DNS

• Securing BIND DNS

 

Module 7: Using Apache

• HTTP operation

• Apache architecture

• Dynamic shared objects

• Adding modules to Apache

• Apache configuration files

• httpd.conf server settings

• httpd.conf main configuration

• HTTP virtual servers

• Virtual hosting DNS implications

• httpd.conf VirtualHost configuration

• Port and IP-based virtual hosts

• Name-based virtual host

• Apache logging

• Log analysis

• The Webalizer

Lab Tasks

• Apache architecture

• Apache content

• Configuring virtual hosts

 

Module 8: Apache Security

• Virtual hosting security implications

• Delegating administration

• Directory protection

• Directory protection with AllowOverride

• Common uses for .htaccess

• Symmetric encryption algorithms

• Asymmetric encryption algorithms

• Digital certificates

• TLS Using mod_ssl.so

Lab Tasks

• Using .htaccess files

• Using TLS certificates with Apache

• Use SNI and TLS with virtual hosts

 

Module 9: Apache Server-Side Scripting Administration

• Dynamic HTTP content

• PHP: hypertext preprocessor

• Developer tools for PHP

• Installing PHP

• Configuring PHP

• Securing PHP

• Security related php.ini configuration

• Java servlets and JSP

• Apache’s Tomcat

• Installing Java SDK

• Installing Tomcat manually

• Using Tomcat with Apache

Lab Tasks

• CGI scripts in Apache

• Apache Tomcat

• Using Tomcat with Apache

 

Module 10: Implementing an FTP Server

• The FTP protocol

• Active mode FTP

• Passive mode FTP

• ProFTPD

• Pure-FTPd

• vsftpd

• Configuring vsftpd

• Anonymous FTP with vsftpd

Lab Tasks

• Configuring vsftpd 

 

Module 11: The Squid Proxy Server

• Squid overview

• Squid file layout

• Squid access control lists

• Applying Squid ACLs

• Tuning Squid and configuring cache hierarchies

• Bandwidth metering

• Monitoring Squid

• Proxy client configuration

Lab Tasks

• Installing and configuring Squid

• Squid cache manager CGI

• Proxy auto configuration

• Configure a Squid proxy cluster

 

Module 12: SQL Fundamentals and MariaDB

• Popular SQL databases

• SELECT statements

• INSERT statements

• UPDATE statements

• DELETE statements

• JOIN clauses

• MariaDB

• MariaDB installation and security

• MariaDB user account management

• MariaDB replication

Lab Tasks

• SQL with Sqlite3

• Installing and securing MariaDB

• Creating a database in MariaDB

• Create a database backed application

 

Module 13: LDAP Concepts and Clients

• LDAP: history and uses

• LDAP: data model basics

• LDAP: protocol basics

• LDAP: applications

• LDAP: search filters

• OpenLDAP client tools

• LDIF: LDAP data interchange format

• Alternative LDAP tools

Lab Tasks

• Querying LDAP

 

Module 14: 389 Directory Server

• Popular LDAP server implementations

• 389 Directory Server (389DS)

• 389 Directory Server features

• 389 Directory Server utilities

Lab Tasks

• Installing and configuring 389DS

 

Module 15: Samba Concepts and Configuration

• Introducing Samba

• NetBIOS and NetBEUI

• Samba daemons

• Accessing Windows/Samba shares from Linux

• Samba utilities

• Samba configuration files

• The smb.conf File

• Mapping permissions and ACLs

• Mapping Linux concepts

• Mapping users

• Sharing home directories

• Sharing printers

• Share authentication

• Share-level access

• User-level access

• Samba account database

• User share restrictions

Lab Tasks

• Samba share-level access

• Samba user-level access

• Samba group shares

• Handling symbolic links with Samba

• Samba home directory shares

 

Module 16: SMTP Theory

• SMTP

• SMTP terminology

• SMTP architecture

• SMTP commands

• SMTP extensions

• SMTP AUTH

• SMTP STARTTLS

• SMTP session 

 

Module 17: Postfix

• Postfix features

• Postfix architecture

• Postfix components

• Postfix configuration

• master.cf

• main.cf

• Postfix map types

• Postfix pattern matching

• Advanced Postfix options

• Virtual domains

• Postfix mail filtering

• Configuration commands

• Management commands

• Postfix logging

• Logfile analysisp

• Postfix, relaying and SMTP AUTH

• SMTP AUTH server and relay control

• SMTP AUTH clients

• Postfix/TLS

• TLS server configuration

• Postfix client configuration for TLS

• Other TLS clients

• Ensuring TLS security

Lab Tasks

• Configuring Postfix

• Postfix virtual host configuration

• Postfix network configuration

• Postfix SMTP AUTH configuration

• Postfix STARTTLS configuration

• SUSE Postfix configuration cleanup

 

Module 18: Mail Services and Retrieval

• Filtering email

• Procmail

• SpamAssassin

• Bogofilter

• amavisd-new mail filtering

• Accessing email

• The IMAP4 protocol

• Dovecot POP3/IMAP server

• Cyrus IMAP/POP3 server

• Cyrus IMAP MTA integration

• Cyrus mailbox administration

• Fetchmail

• Roundcube webmail

• Mailing lists

• GNU Mailman

• Mailman configuration

Lab Tasks

• Configuring Procmail and SpamAssassin

• Configuring Cyrus IMAP

• Dovecot TLS configuration

• Configuring Roundcube

• Base Mailman configuration

• Basic mailing list

• Private mailing list

 

Module 19: NIS

• NIS overview

• NIS limitations and advantages

• NIS client configuration

• NIS server configuration

• NIS troubleshooting aids Lab Tasks

• Using NIS for centralized user accounts

• Configuring NIS

• NIS slave server

• NIS failover

• Troubleshooting practice: NIS 

Prerequisites

Students should already be comfortable with basic Linux or Unix administration. Fundamentals such as the Linux filesystem, process management, and how to edit files are not covered in class. A good understanding of network concepts, the TCP/IP protocol suite is also assumed. These skills are taught in the U8583S: Linux Fundamentals (GL120) and H7091S: Enterprise Linux Systems Administration (GL250) courses.