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  1. Security Guide
  2. 1. Security Overview
    1. 1.1. Introduction to Security
      1. 1.1.1. What is Computer Security?
      2. 1.1.2. SELinux
      3. 1.1.3. Security Controls
      4. 1.1.4. Conclusion
    2. 1.2. Vulnerability Assessment
      1. 1.2.1. Thinking Like the Enemy
      2. 1.2.2. Defining Assessment and Testing
      3. 1.2.3. Evaluating the Tools
    3. 1.3. Security Threats
      1. 1.3.1. Threats to Network Security
      2. 1.3.2. Threats to Server Security
      3. 1.3.3. Threats to Workstation and Home PC Security
    4. 1.4. Common Exploits and Attacks
    5. 1.5. Security Updates
      1. 1.5.1. Updating Packages
      2. 1.5.2. Verifying Signed Packages
      3. 1.5.3. Installing Signed Packages
      4. 1.5.4. Applying the Changes
  3. 2. Securing Your Network
    1. 2.1. Workstation Security
      1. 2.1.1. Evaluating Workstation Security
      2. 2.1.2. BIOS and Boot Loader Security
      3. 2.1.3. Password Security
      4. 2.1.4. Creating User Passwords Within an Organization
      5. 2.1.5. Locking Inactive Accounts
      6. 2.1.6. Customizing Access Control
      7. 2.1.7. Time-based Restriction of Access
      8. 2.1.8. Applying Account Limits
      9. 2.1.9. Administrative Controls
      10. 2.1.10. Session Locking
      11. 2.1.11. Available Network Services
      12. 2.1.12. Personal Firewalls
      13. 2.1.13. Security Enhanced Communication Tools
      14. 2.1.14. Enforcing Read-Only Mounting of Removable Media
    2. 2.2. Server Security
      1. 2.2.1. Securing Services With TCP Wrappers and xinetd
      2. 2.2.2. Securing Portmap
      3. 2.2.3. Securing NIS
      4. 2.2.4. Securing NFS
      5. 2.2.5. Securing the Apache HTTP Server
      6. 2.2.6. Securing FTP
      7. 2.2.7. Securing Postfix
      8. 2.2.8. Securing Sendmail
      9. 2.2.9. Verifying Which Ports Are Listening
      10. 2.2.10. Disable Source Routing
      11. 2.2.11. Reverse Path Forwarding
    3. 2.3. Single Sign-on (SSO)
    4. 2.4. Pluggable Authentication Modules (PAM)
    5. 2.5. Kerberos
    6. 2.6. TCP Wrappers and xinetd
      1. 2.6.1. TCP Wrappers
      2. 2.6.2. TCP Wrappers Configuration Files
      3. 2.6.3. xinetd
      4. 2.6.4. xinetd Configuration Files
      5. 2.6.5. Additional Resources
    7. 2.7. Securing Virtual Private Networks (VPNs)
      1. 2.7.1. IPsec VPN Using Libreswan
      2. 2.7.2. VPN Configurations Using Libreswan
      3. 2.7.3. Host-To-Host VPN Using Libreswan
      4. 2.7.4. Site-to-Site VPN Using Libreswan
      5. 2.7.5. Site-to-Site Single Tunnel VPN Using Libreswan
      6. 2.7.6. Subnet Extrusion Using Libreswan
      7. 2.7.7. Road Warrior Access VPN Using Libreswan
      8. 2.7.8. Road Warrior Access VPN Using Libreswan and XAUTH with X.509
      9. 2.7.9. Additional Resources
    8. 2.8. Firewalls
      1. 2.8.1. Netfilter and IPTables
      2. 2.8.2. Basic Firewall Configuration
      3. 2.8.3. Using IPTables
      4. 2.8.4. Common IPTables Filtering
      5. 2.8.5. FORWARD and NAT Rules
      6. 2.8.6. Malicious Software and Spoofed IP Addresses
      7. 2.8.7. IPTables and Connection Tracking
      8. 2.8.8. IPv6
      9. 2.8.9. IPTables
  4. 3. Encryption
    1. 3.1. Data at Rest
      1. 3.1.1. Full Disk Encryption
      2. 3.1.2. File-Based Encryption
      3. 3.1.3. LUKS Disk Encryption
    2. 3.2. Data in Motion
      1. 3.2.1. Virtual Private Networks
      2. 3.2.2. Secure Shell
    3. 3.3. OpenSSL Intel AES-NI Engine
    4. 3.4. Using the Random Number Generator
    5. 3.5. GNU Privacy Guard (GPG)
      1. 3.5.1. Creating GPG Keys in GNOME
      2. 3.5.2. Creating GPG Keys in KDE
      3. 3.5.3. Creating GPG Keys Using the Command Line
      4. 3.5.4. About Public Key Encryption
    6. 3.6. Using stunnel
      1. 3.6.1. Installing stunnel
      2. 3.6.2. Configuring stunnel as a TLS Wrapper
      3. 3.6.3. Starting, Stopping and Restarting stunnel
    7. 3.7. Hardening TLS Configuration
      1. 3.7.1. Choosing Algorithms to Enable
      2. 3.7.2. Using Implementations of TLS
      3. 3.7.3. Configuring Specific Applications
      4. 3.7.4. Additional Information
  5. 4. General Principles of Information Security
  6. 5. Secure Installation
    1. 5.1. Disk Partitions
    2. 5.2. Utilize LUKS Partition Encryption
  7. 6. Software Maintenance
    1. 6.1. Install Minimal Software
    2. 6.2. Plan and Configure Security Updates
    3. 6.3. Adjusting Automatic Updates
    4. 6.4. Install Signed Packages from Well Known Repositories
  8. 7. System Auditing
    1. 7.1. Audit System Architecture
    2. 7.2. Installing the audit Packages
    3. 7.3. Configuring the audit Service
      1. 7.3.1. Configuring auditd for a CAPP Environment
    4. 7.4. Starting the audit Service
    5. 7.5. Defining Audit Rules
      1. 7.5.1. Defining Audit Rules with the auditctl Utility
      2. 7.5.2. Defining Persistent Audit Rules and Controls in the /etc/audit/audit.rules File
    6. 7.6. Understanding Audit Log Files
    7. 7.7. Searching the Audit Log Files
    8. 7.8. Creating Audit Reports
    9. 7.9. Configuring PAM for Auditing
      1. 7.9.1. Configuring pam_tty_audit
    10. 7.10. Additional Resources
  9. 8. Compliance and Vulnerability Scanning with OpenSCAP
    1. 8.1. Security Compliance in Red Hat Enterprise Linux
    2. 8.2. Defining Compliance Policy
      1. 8.2.1. The XCCDF File Format
      2. 8.2.2. The OVAL File Format
      3. 8.2.3. The Data Stream Format
    3. 8.3. Using SCAP Workbench
      1. 8.3.1. Installing SCAP Workbench
      2. 8.3.2. Running SCAP Workbench
      3. 8.3.3. Scanning the System
      4. 8.3.4. Customizing Security Profiles
      5. 8.3.5. Saving SCAP Content
      6. 8.3.6. Viewing Scan Results and Generating Scan Reports
    4. 8.4. Using oscap
      1. 8.4.1. Installing oscap
      2. 8.4.2. Displaying SCAP Content
      3. 8.4.3. Scanning the System
      4. 8.4.4. Generating Reports and Guides
      5. 8.4.5. Validating SCAP Content
      6. 8.4.6. Using OpenSCAP to Remediate the System
    5. 8.5. Using OpenSCAP with Red Hat Satellite
    6. 8.6. Installing USGCB-Compliant System with Kickstart
    7. 8.7. Practical Examples
      1. 8.7.1. Auditing Security Vulnerabilities of Red Hat Products
      2. 8.7.2. Auditing System Settings with SCAP Security Guide
    8. 8.8. Additional Resources
  10. 9. Checking Integrity with AIDE
    1. 9.1. Introduction
    2. 9.2. Installing AIDE
    3. 9.3. Performing Integrity Checks
    4. 9.4. Updating an AIDE Database
    5. 9.5. Additional Resources
  11. 10. Federal Standards and Regulations
    1. 10.1. Introduction
    2. 10.2. Federal Information Processing Standard (FIPS)
      1. 10.2.1. Enabling FIPS Mode
      2. 10.2.2. Enabling FIPS Mode for Applications Using NSS
    3. 10.3. National Industrial Security Program Operating Manual (NISPOM)
    4. 10.4. Payment Card Industry Data Security Standard (PCI DSS)
    5. 10.5. Security Technical Implementation Guide
  12. 11. References
  13. A. Encryption Standards
    1. A.1. Synchronous Encryption
      1. A.1.1. Advanced Encryption Standard - AES
      2. A.1.2. Data Encryption Standard - DES
    2. A.2. Public-key Encryption
      1. A.2.1. Diffie-Hellman
      2. A.2.2. RSA
      3. A.2.3. DSA
      4. A.2.4. SSL/TLS
      5. A.2.5. Cramer-Shoup Cryptosystem
      6. A.2.6. ElGamal Encryption
  14. B. Audit System Reference
    1. B.1. Audit Event Fields
    2. B.2. Audit Record Types
  15. C. Revision History
  16. Legal Notice

3.5.4. About Public Key Encryption

  1. Wikipedia - Public Key Cryptography
  2. HowStuffWorks - Encryption
  • 3.5.3. Creating GPG Keys Using the Command Line
  • 3.6. Using stunnel
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