Linux Security Training Overview
This Enterprise Linux Security Administration training course teaches attendees how to properly secure machines running the Linux operating system. Students gain an excellent understanding of potential security vulnerabilities and learn a broad range of general hardening techniques.
NOTE: This class can be taught using the Linux distribution of your choice.
Location and Pricing
Accelebrate offers instructor-led enterprise training for groups of 3 or more online or at your site. Most Accelebrate classes can be flexibly scheduled for your group, including delivery in half-day segments across a week or set of weeks. To receive a customized proposal and price quote for private corporate training on-site or online, please contact us.
In addition, some courses are available as live, instructor-led training from one of our partners.
Objectives
- Gain an excellent understanding of potential security vulnerabilities
- Packet filtering, password policies, and file integrity checking
- How to audit existing machines and
- How to securely deploy new network services.
- How to use advanced security technologies such as Kerberos and SELinux
Prerequisites
This class covers advanced security topics and is intended for experienced systems administrators. Candidates should have current Linux or UNIX systems administration experience equivalent to Accelebrate’s Linux Fundamentals, Enterprise Linux Systems Administration, and Enterprise Linux Network Services courses.
Outline
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introduction
Security Concepts
- Basic Security Principles
- RHEL7 Default Install
- RHEL7 Firewall
- SLES12 Default Install
- SUSE Basic Firewall Configuration
- SLES12: File Security
- Minimization – Discovery
- Service Discovery
- Hardening
- Security Concepts
Scanning, Probing, and Mapping Vulnerabilities
- The Security Environment
- Stealth Reconnaissance
- The WHOIS database
- Interrogating DNS
- Discovering Hosts
- Discovering Reachable Services
- Reconnaissance with SNMP
- Discovery of RPC Services
- Enumerating NFS Shares
- Nessus/OpenVAS Insecurity Scanner
- Configuring OpenVAS
- Intrusion Detection Systems
- Snort Rules
- Writing Snort Rules
Password Security and PAM
- Unix Passwords
- Password Aging
- Auditing Passwords
- PAM Overview
- PAM Module Types
- PAM Order of Processing
- PAM Control Statements
- PAM Modules
- pam_unix
- pam_cracklib.so
- pam_pwcheck.so
- pam_env.so
- pam_xauth.so
- pam_tally2.so
- pam_wheel.so
- pam_limits.so
- pam_nologin.so
- pam_deny.so
- pam_warn.so
- pam_securetty.so
- pam_time.so
- pam_access.so
- pam_listfile.so
- pam_lastlog.so
- pam_console.so
Secure Network Time Protocol (NTP)
- The Importance of Time
- Hardware and System Clock
- Time Measurements
- NTP Terms and Definitions
- Synchronization Methods
- NTP Evolution
- Time Server Hierarchy
- Operational Modes
- NTP Clients
- Configuring NTP Clients
- Configuring NTP Servers
- Securing NTP
- NTP Packet Integrity
- Useful NTP Commands
Kerberos Concepts and Components
- Common Security Problems
- Account Proliferation
- The Kerberos Solution
- Kerberos History
- Kerberos Implementations
- Kerberos Concepts
- Kerberos Principals
- Kerberos Safeguards
- Kerberos Components
- Authentication Process
- Identification Types
- Logging In
- Gaining Privileges
- Using Privileges
- Kerberos Components and the KDC
- Kerberized Services Review
- KDC Server Daemons
- Configuration Files
- Utilities Overview
Implementing Kerberos
- Plan Topology and Implementation
- Kerberos 5 Client Software
- Kerberos 5 Server Software
- Synchronize Clocks
- Create Master KDC
- Configuring the Master KDC
- KDC Logging
- Kerberos Realm Defaults
- Specifying [realms]
- Specifying [domain_realm]
- Allow Administrative Access
- Create KDC Databases
- Create Administrators
- Install Keys for Services
- Start Services
- Add Host Principals
- Add Common Service Principals
- Configure Slave KDCs
- Create Principals for Slaves
- Define Slaves as KDCs
- Copy Configuration to Slaves
- Install Principals on Slaves
- Synchronization of Database
- Propagate Data to Slaves
- Create Stash on Slaves
- Start Slave Daemons
- Client Configuration
- Install krb5.conf on Clients
- Client PAM Configuration
- Install Client Host Keys
Administering and Using Kerberos
- Administrative Tasks
- Key Tables
- Managing Keytabs
- Managing Principals
- Viewing Principals
- Adding, Deleting, and Modifying Principals
- Principal Policy
- Overall Goals for Users
- Signing Into Kerberos
- Ticket types
- Viewing Tickets
- Removing Tickets
- Passwords
- Changing Passwords
- Giving Others Access
- Using Kerberized Services
- Kerberized FTP
- Enabling Kerberized Services
- OpenSSH and Kerberos
Securing the Filesystem
- Filesystem Mount Options
- NFS Properties
- NFS Export Option
- NFSv4 and GSSAPI Auth
- Implementing NFSv4
- Implementing Kerberos with NFS
- GPG – GNU Privacy Guard
- File Encryption with OpenSSL
- File Encryption With encfs
- Linux Unified Key Setup (LUKS)
Aide
- Host Intrusion Detection Systems
- Using RPM as a HIDS
- Introduction to AIDE
- AIDE Installation
- AIDE Policies
- AIDE Usage
Accountability with Kernel Auditd
- Accountability and Auditing
- Simple Session Auditing
- Simple Process Accounting & Command History
- Kernel-Level Auditing
- Configuring the Audit Daemon
- Controlling Kernel Audit System
- Creating Audit Rules
- Searching Audit Logs
- Generating Audit Log Reports
- Audit Log Analysis
Selinux
- DAC vs. MAC
- Shortcomings of Traditional Unix Security
- AppArmor
- SELinux Goals
- SELinux Evolution
- SELinux Modes
- Gathering SELinux Information
- SELinux Virtual Filesystem
- SELinux Contexts
- Managing Contexts
- The SELinux Policy
- Choosing an SELinux Policy
- Policy Layout
- Tuning and Adapting Policy
- Booleans
- Permissive Domains
- Managing File Context Database
- Managing Port Contexts
- SELinux Policy Tools
- Examining Policy
- SELinux Troubleshooting
- SELinux Troubleshooting Continued
Securing Apache
- Apache Overview
- httpd.conf – Server Settings
- Configuring CGI
- Turning Off Unneeded Modules
- Delegating Administration
- Apache Access Controls (mod_access)
- HTTP User Authentication
- Standard Auth Modules
- HTTP Digest Authentication
- TLS Using mod_ssl.so
- Authentication via SQL
- Authentication via LDAP
- Authentication via Kerberos
- Scrubbing HTTP Headers
- Metering HTTP Bandwidth
Securing PostgreSQL
- PostgreSQL Overview
- PostgreSQL Default Config
- Configuring TLS
- Client Authentication Basics
- Advanced Authentication
- Ident-based Authentication
Securing Email Systems
- SMTP Implementations
- Security Considerations
- chrooting Postfix
- Email with GSSAPI/Kerberos Auth
Conclusion
Training Materials
All Linux training attendees receive comprehensive courseware.
Software Requirements
Attendees will not need to install any software on their computers for this class. The class will be conducted in a remote environment that Accelebrate will provide; students will only need a local computer with a web browser and a stable Internet connection. Any recent version of Microsoft Edge, Mozilla Firefox, or Google Chrome will work well.
