Enterprise Linux Security Administration

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Course Description

This Enterprise Linux Security Administration highly technical training course focuses on properly securing machines running the Linux operating systems. A broad range of general security techniques such as packet filtering, password policies, and file integrity checking are covered. Advanced security technologies such as Kerberos and SELinux are taught. Special attention is given to securing commonly deployed network services. At the end of the course, students have an excellent understanding of the potential security vulnerabilities -- know how to audit existing machines, and how to securely deploy new network services.

 

Supported Distributions:

•     Red Hat Enterprise Linux 7
•     SUSE Linux Enterprise 12

Course Outline

    1. Security Concepts

1.         Basic Security Principles
2.         RHEL7 Default Install
3.         RHEL7 Firewall
4.         SLES12 Default Install
5.         SUSE Basic Firewall Configuration
6.         SLES12: File Security
7.         Minimization – Discovery
8.         Service Discovery
9.         Hardening
10.         Security Concepts

    Lab Tasks

1.         Removing Packages Using RPM
2.         Firewall Configuration
3.         Process Discovery
4.         Operation of the setuid() and capset() System Calls
5.         Operation of the chroot() System Call

    2. Scanning, Probing, and Mapping Vulnerabilities

1.         The Security Environment
2.         Stealth Reconnaissance
3.         The WHOIS database
4.         Interrogating DNS
5.         Discovering Hosts
6.         Discovering Reachable Services
7.         Reconnaissance with SNMP
8.         Discovery of RPC Services
9.         Enumerating NFS Shares
10.         Nessus/OpenVAS Insecurity Scanner
11.         Configuring OpenVAS
12.         Intrusion Detection Systems
13.         Snort Rules
14.         Writing Snort Rules

    Lab Tasks

1.         NMAP
2.         OpenVAS
3.         Advanced nmap Options

    3. Password Security and PAM

1.         Unix Passwords
2.         Password Aging
3.         Auditing Passwords
4.         PAM Overview
5.         PAM Module Types
6.         PAM Order of Processing
7.         PAM Control Statements
8.         PAM Modules
9.         pam_unix
10.         pam_cracklib.so
11.         pam_pwcheck.so
12.         pam_env.so
13.         pam_xauth.so
14.         pam_tally2.so
15.         pam_wheel.so
16.         pam_limits.so
17.         pam_nologin.so
18.         pam_deny.so
19.         pam_warn.so
20.         pam_securetty.so
21.         pam_time.so
22.         pam_access.so
23.         pam_listfile.so
24.         pam_lastlog.so
25.         pam_console.so

    Lab Tasks

1.         John the Ripper
2.         Cracklib
3.         Using pam_listfile to Implement Arbitrary ACLs
4.         Using pam_limits to Restrict Simultaneous Logins
5.         Using pam_nologin to Restrict Logins
6.         Using pam_access to Restrict Logins
7.         su & pam

    4. Secure Network Time Protocol (NTP)

1.         The Importance of Time
2.         Hardware and System Clock
3.         Time Measurements
4.         NTP Terms and Definitions
5.         Synchronization Methods
6.         NTP Evolution
7.         Time Server Hierarchy
8.         Operational Modes
9.         NTP Clients
10.         Configuring NTP Clients
11.         Configuring NTP Servers
12.         Securing NTP
13.         NTP Packet Integrity
14.         Useful NTP Commands

    Lab Tasks

1.         Configuring and Securing NTP
2.         Peering NTP with Multiple Systems

    5. Kerberos Concepts and Components

1.         Common Security Problems
2.         Account Proliferation
3.         The Kerberos Solution
4.         Kerberos History
5.         Kerberos Implementations
6.         Kerberos Concepts
7.         Kerberos Principals
8.         Kerberos Safeguards
9.         Kerberos Components
10.         Authentication Process
11.         Identification Types
12.         Logging In
13.         Gaining Privileges
14.         Using Privileges
15.         Kerberos Components and the KDC
16.         Kerberized Services Review
17.         KDC Server Daemons
18.         Configuration Files
19.         Utilities Overview

    6. Implementing Kerberos

1.         Plan Topology and Implementation
2.         Kerberos 5 Client Software
3.         Kerberos 5 Server Software
4.         Synchronize Clocks
5.         Create Master KDC
6.         Configuring the Master KDC
7.         KDC Logging
8.         Kerberos Realm Defaults
9.         Specifying
10.         Specifying
11.         Allow Administrative Access
12.         Create KDC Databases
13.         Create Administrators
14.         Install Keys for Services
15.         Start Services
16.         Add Host Principals
17.         Add Common Service Principals
18.         Configure Slave KDCs
19.         Create Principals for Slaves
20.         Define Slaves as KDCs
21.         Copy Configuration to Slaves
22.         Install Principals on Slaves
23.         Synchronization of Database
24.         Propagate Data to Slaves
25.         Create Stash on Slaves
26.         Start Slave Daemons
27.         Client Configuration
28.         Install krb5.conf on Clients
29.         Client PAM Configuration
30.         Install Client Host Keys

    Lab Tasks

1.         Implementing Kerberos

    7. Administering and Using Kerberos

1.         Administrative Tasks
2.         Key Tables
3.         Managing Keytabs
4.         Managing Principals
5.         Viewing Principals
6.         Adding, Deleting, and Modifying Principals
7.         Principal Policy
8.         Overall Goals for Users
9.         Signing In to Kerberos
10.         Ticket types
11.         Viewing Tickets
12.         Removing Tickets
13.         Passwords
14.         Changing Passwords
15.         Giving Others Access
16.         Using Kerberized Services
17.         Kerberized FTP
18.         Enabling Kerberized Services
19.         OpenSSH and Kerberos

    Lab Tasks

1.         Using Kerberized Clients
2.         Forwarding Kerberos Tickets
3.         OpenSSH with Kerberos
4.         Wireshark and Kerberos

    8. Securing the Filesystem

1.         Filesystem Mount Options
2.         NFS Properties
3.         NFS Export Option
4.         NFSv4 and GSSAPI Auth
5.         Implementing NFSv4
6.         Implementing Kerberos with NFS
7.         GPG – GNU Privacy Guard
8.         File Encryption with OpenSSL
9.         File Encryption With encfs
10.         Linux Unified Key Setup (LUKS)

    Lab Tasks

1.         Securing Filesystems
2.         Securing NFS
3.         Implementing NFSv4
4.         File Encryption with GPG
5.         File Encryption With OpenSSL
6.         LUKS-on-disk format Encrypted Filesystem

    9. AIDE

1.         Host Intrusion Detection Systems
2.         Using RPM as a HIDS
3.         Introduction to AIDE
4.         AIDE Installation
5.         AIDE Policies
6.         AIDE Usage

    Lab Tasks

1.         File Integrity Checking with RPM
2.         File Integrity Checking with AIDE

    10. Accountability with Kernel Auditd

1.         Accountability and Auditing
2.         Simple Session Auditing
3.         Simple Process Accounting & Command History
4.         Kernel-Level Auditing
5.         Configuring the Audit Daemon
6.         Controlling Kernel Audit System
7.         Creating Audit Rules
8.         Searching Audit Logs
9.         Generating Audit Log Reports
10.         Audit Log Analysis

    Lab Tasks

1.         Auditing Login/Logout
2.         Auditing File Access
3.         Auditing Command Execution

    11. SELinux

1.         DAC vs. MAC
2.         Shortcomings of Traditional Unix Security
3.         AppArmor
4.         SELinux Goals
5.         SELinux Evolution
6.         SELinux Modes
7.         Gathering SELinux Information
8.         SELinux Virtual Filesystem
9.         SELinux Contexts
10.         Managing Contexts
11.         The SELinux Policy
12.         Choosing an SELinux Policy
13.         Policy Layout
14.         Tuning and Adapting Policy
15.         Booleans
16.         Permissive Domains
17.         Managing File Context Database
18.         Managing Port Contexts
19.         SELinux Policy Tools
20.         Examining Policy
21.         SELinux Troubleshooting
22.         SELinux Troubleshooting Continued

    Lab Tasks

1.         Exploring SELinux Modes
2.         Exploring AppArmor Modes
3.         SELinux Contexts in Action
4.         Exploring AppArmor
5.         Managing SELinux Booleans
6.         Creating Policy with Audit2allow
7.         Creating & Compiling Policy from Source

    12. Securing Apache

1.         Apache Overview
2.         httpd.conf – Server Settings
3.         Configuring CGI
4.         Turning Off Unneeded Modules
5.         Delegating Administration
6.         Apache Access Controls (mod_access)
7.         HTTP User Authentication
8.         Standard Auth Modules
9.         HTTP Digest Authentication
10.         TLS Using mod_ssl.so
11.         Authentication via SQL
12.         Authentication via LDAP
13.         Authentication via Kerberos
14.         Scrubbing HTTP Headers
15.         Metering HTTP Bandwidth

    Lab Tasks

1.         Hardening Apache by Minimizing Loaded Modules
2.         Scrubbing Apache & PHP Version Headers
3.         Protecting Web Content
4.         Protecting Web Content
5.         Using the suexec Mechanism
6.         Create a TLS CA key pair
7.         Using SSL CA Certificates with Apache
8.         Enable Apache SSL Client Certificate Authentication
9.         Enabling SSO in Apache with mod_auth_kerb

    13. Securing PostgreSQL

1.         PostgreSQL Overview
2.         PostgreSQL Default Config
3.         Configuring TLS
4.         Client Authentication Basics
5.         Advanced Authentication
6.         Ident-based Authentication

    Lab Tasks

1.         Configure PostgreSQL
2.         PostgreSQL with TLS
3.         PostgreSQL with Kerberos Authentication
4.         Securing PostgreSQL with Web Based Applications

    A. Securing Email Systems

1.         SMTP Implementations
2.         Security Considerations
3.         chrooting Postfix
4.         Email with GSSAPI/Kerberos Auth

    Lab Tasks

1.         Postfix In a Change Root Environment

Learning Path

• Please contact us for more suggestions.

• Linux Kernel Debugging and Security

Ways to Attend

• Attend a public course, if there is one available. Please check our schedule, or register your interest in joining a course in your area.
• Private onsite Team training also available, please contact us to discuss. We can customise this course to suit your business requirements.