Security Guide
1. Security Overview
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1. 1.1. Introduction to Security
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  1. 1.1.1. What is Computer Security?
    
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    1.1.1.1. How did Computer Security come about?
    
    1.1.1.2. Security Today
    
    1.1.1.3. Standardizing Security
  2. 1.1.2. SELinux
  3. 1.1.3. Security Controls
    
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    1.1.3.1. Physical Controls
    
    1.1.3.2. Technical Controls
    
    1.1.3.3. Administrative Controls
  4. 1.1.4. Conclusion
2. 1.2. Vulnerability Assessment
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  1. 1.2.1. Thinking Like the Enemy
  2. 1.2.2. Defining Assessment and Testing
    
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    1.2.2.1. Establishing a Methodology
  3. 1.2.3. Evaluating the Tools
    
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    1.2.3.1. Scanning Hosts with Nmap
    
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    1.2.3.1.1. Using Nmap
    
    1.2.3.2. Nessus
    
    1.2.3.3. Nikto
    
    1.2.3.4. Anticipating Your Future Needs
3. 1.3. Security Threats
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  1. 1.3.1. Threats to Network Security
    
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    1.3.1.1. Insecure Architectures
    
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    1.3.1.1.1. Broadcast Networks
    
    1.3.1.1.2. Centralized Servers
  2. 1.3.2. Threats to Server Security
    
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    1.3.2.1. Unused Services and Open Ports
    
    1.3.2.2. Inattentive Administration
    
    1.3.2.3. Inherently Insecure Services
  3. 1.3.3. Threats to Workstation and Home PC Security
    
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    1.3.3.1. Bad Passwords
    
    1.3.3.2. Vulnerable Client Applications
4. 1.4. Common Exploits and Attacks
5. 1.5. Security Updates
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2. Securing Your Network
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1. 2.1. Workstation Security
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  1. 2.1.1. Evaluating Workstation Security
  2. 2.1.2. BIOS and Boot Loader Security
    
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    2.1.2.1. BIOS Passwords
    
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    2.1.2.1.1. Securing Non-x86 Platforms
    
    2.1.2.2. Boot Loader Passwords
    
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    2.1.2.2.1. Password Protecting GRUB
    
    2.1.2.2.2. Disabling Interactive Startup
  3. 2.1.3. Password Security
    
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    2.1.3.1. Creating Strong Passwords
  4. 2.1.4. Creating User Passwords Within an Organization
    
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    2.1.4.1. Forcing Strong Passwords
    
    2.1.4.2. Passphrases
    
    2.1.4.3. Password Aging
  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
    
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    2.1.9.1. Allowing Root Access
    
    2.1.9.2. Disallowing Root Access
    
    2.1.9.3. Enabling Automatic Logouts
    
    2.1.9.4. Limiting Root Access
    
    2.1.9.5. Account Locking
  10. 2.1.10. Session Locking
    
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    2.1.10.1. Locking GNOME Using gnome-screensaver-command
    
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    2.1.10.1.1. Automatic Lock on Screen Saver Activation
    
    2.1.10.1.2. Remote Session Locking
    
    2.1.10.2. Locking Virtual Consoles Using vlock
  11. 2.1.11. Available Network Services
    
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    2.1.11.1. Risks To Services
    
    2.1.11.2. Identifying and Configuring Services
    
    2.1.11.3. Insecure 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
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  1. 2.2.1. Securing Services With TCP Wrappers and xinetd
    
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    2.2.1.1. Enhancing Security With TCP Wrappers
    
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    2.2.1.1.1. TCP Wrappers and Connection Banners
    
    2.2.1.1.2. TCP Wrappers and Attack Warnings
    
    2.2.1.1.3. TCP Wrappers and Enhanced Logging
    
    2.2.1.2. Enhancing Security With xinetd
    
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    2.2.1.2.1. Setting a Trap
    
    2.2.1.2.2. Controlling Server Resources
  2. 2.2.2. Securing Portmap
    
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    2.2.2.1. Protect portmap With TCP Wrappers
    
    2.2.2.2. Protect portmap With iptables
  3. 2.2.3. Securing NIS
    
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    2.2.3.1. Carefully Plan the Network
    
    2.2.3.2. Use a Password-like NIS Domain Name and Hostname
    
    2.2.3.3. Edit the /var/yp/securenets File
    
    2.2.3.4. Assign Static Ports and Use iptables Rules
    
    2.2.3.5. Use Kerberos Authentication
  4. 2.2.4. Securing NFS
    
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    2.2.4.1. Carefully Plan the Network
    
    2.2.4.2. Securing NFS Mount Options
    
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    2.2.4.2.1. Review the NFS Server
    
    2.2.4.2.2. Review the NFS Client
    
    2.2.4.3. Beware of Syntax Errors
    
    2.2.4.4. Do Not Use the no_root_squash Option
    
    2.2.4.5. NFS Firewall Configuration
  5. 2.2.5. Securing the Apache HTTP Server
  6. 2.2.6. Securing FTP
    
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    2.2.6.1. FTP Greeting Banner
    
    2.2.6.2. Anonymous Access
    
    2.2.6.3. User Accounts
    
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    2.2.6.3.1. Restricting User Accounts
    
    2.2.6.4. Use TCP Wrappers To Control Access
  7. 2.2.7. Securing Postfix
    
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    2.2.7.1. Limiting a Denial of Service Attack
    
    2.2.7.2. NFS and Postfix
    
    2.2.7.3. Mail-only Users
    
    2.2.7.4. Disable Postfix Network Listening
    
    2.2.7.5. Configuring Postfix to Use SASL
  8. 2.2.8. Securing Sendmail
    
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    2.2.8.1. Limiting a Denial of Service Attack
    
    2.2.8.2. NFS and Sendmail
    
    2.2.8.3. Mail-only Users
    
    2.2.8.4. Disable Sendmail Network Listening
  9. 2.2.9. Verifying Which Ports Are Listening
  10. 2.2.10. Disable Source Routing
  11. 2.2.11. Reverse Path Forwarding
    
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    2.2.11.1. Additional Resources
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
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  1. 2.6.1. TCP Wrappers
    
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    2.6.1.1. Advantages of TCP Wrappers
  2. 2.6.2. TCP Wrappers Configuration Files
    
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    2.6.2.1. Formatting Access Rules
    
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    2.6.2.1.1. Wildcards
    
    2.6.2.1.2. Patterns
    
    2.6.2.1.3. Portmap and TCP Wrappers
    
    2.6.2.1.4. Operators
    
    2.6.2.2. Option Fields
    
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    2.6.2.2.1. Logging
    
    2.6.2.2.2. Access Control
    
    2.6.2.2.3. Shell Commands
    
    2.6.2.2.4. Expansions
  3. 2.6.3. xinetd
  4. 2.6.4. xinetd Configuration Files
    
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    2.6.4.1. The /etc/xinetd.conf File
    
    2.6.4.2. The /etc/xinetd.d/ Directory
    
    2.6.4.3. Altering xinetd Configuration Files
    
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    2.6.4.3.1. Logging Options
    
    2.6.4.3.2. Access Control Options
    
    2.6.4.3.3. Binding and Redirection Options
    
    2.6.4.3.4. Resource Management Options
  5. 2.6.5. Additional Resources
    
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    2.6.5.1. Installed TCP Wrappers Documentation
    
    2.6.5.2. Related Books
7. 2.7. Securing Virtual Private Networks (VPNs)
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  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
    
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    2.7.3.1. Verify Host-To-Host VPN Using Libreswan
  4. 2.7.4. Site-to-Site VPN Using Libreswan
    
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    2.7.4.1. Verify 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
    
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    2.7.9.1. Installed Documentation
    
    2.7.9.2. Online Documentation
8. 2.8. Firewalls
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  1. 2.8.1. Netfilter and IPTables
    
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    2.8.1.1. IPTables Overview
  2. 2.8.2. Basic Firewall Configuration
    
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    2.8.2.1. Firewall Configuration Tool
    
    2.8.2.2. Enabling and Disabling the Firewall
    
    2.8.2.3. Trusted Services
    
    2.8.2.4. Other Ports
    
    2.8.2.5. Saving the Settings
    
    2.8.2.6. Activating the IPTables Service
  3. 2.8.3. Using IPTables
    
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    2.8.3.1. IPTables Command Syntax
    
    2.8.3.2. Basic Firewall Policies
    
    2.8.3.3. Saving and Restoring IPTables Rules
  4. 2.8.4. Common IPTables Filtering
  5. 2.8.5. FORWARD and NAT Rules
    
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    2.8.5.1. Postrouting and IP Masquerading
    
    2.8.5.2. Prerouting
    
    2.8.5.3. DMZs and IPTables
  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
    
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    2.8.9.1. Packet Filtering
    
    2.8.9.2. Command Options for IPTables
    
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    2.8.9.2.1. Structure of IPTables Command Options
    
    2.8.9.2.2. Command Options
    
    2.8.9.2.3. IPTables Parameter Options
    
    2.8.9.2.4. IPTables Match Options
    
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    2.8.9.2.4.1. TCP Protocol
    
    2.8.9.2.4.2. UDP Protocol
    
    2.8.9.2.4.3. ICMP Protocol
    
    2.8.9.2.4.4. Additional Match Option Modules
    
    2.8.9.2.5. Target Options
    
    2.8.9.2.6. Listing Options
    
    2.8.9.3. Saving IPTables Rules
    
    2.8.9.4. IPTables Control Scripts
    
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    2.8.9.4.1. IPTables Control Scripts Configuration File
    
    2.8.9.5. IPTables and IP Sets
    
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    2.8.9.5.1. Installing ipset
    
    2.8.9.5.2. ipset Commands
    
    2.8.9.5.3. IP Set Types
    
    2.8.9.6. IPTables and IPv6
    
    2.8.9.7. Additional Resources
    
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    2.8.9.7.1. Useful Firewall Websites
    
    2.8.9.7.2. Related Documentation
    
    2.8.9.7.3. Installed IP Tables Documentation
3. Encryption
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1. 3.1. Data at Rest
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  1. 3.1.1. Full Disk Encryption
  2. 3.1.2. File-Based Encryption
  3. 3.1.3. LUKS Disk Encryption
    
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    3.1.3.1. LUKS Implementation in Red Hat Enterprise Linux
    
    3.1.3.2. Manually Encrypting Directories
    
    3.1.3.3. Adding a New Passphrase to an Existing Device
    
    3.1.3.4. Removing a Passphrase from an Existing Device
    
    3.1.3.5. Creating Encrypted Block Devices in Anaconda
    
    3.1.3.6. Additional Resources
2. 3.2. Data in Motion
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  1. 3.2.1. Virtual Private Networks
  2. 3.2.2. Secure Shell
    
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    3.2.2.1. Cryptographic Login
    
    3.2.2.2. Multiple Authentication Methods
    
    3.2.2.3. Other Ways of Securing SSH
3. 3.3. OpenSSL Intel AES-NI Engine
4. 3.4. Using the Random Number Generator
5. 3.5. GNU Privacy Guard (GPG)
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6. 3.6. Using stunnel
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7. 3.7. Hardening TLS Configuration
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  1. 3.7.1. Choosing Algorithms to Enable
  2. 3.7.2. Using Implementations of TLS
    
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    3.7.2.1. Working with Cipher Suites in OpenSSL
    
    3.7.2.2. Working with Cipher Suites in GnuTLS
  3. 3.7.3. Configuring Specific Applications
    
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    3.7.3.1. Configuring the Apache HTTP Server
  4. 3.7.4. Additional Information
4. General Principles of Information Security
5. Secure Installation
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1. 5.1. Disk Partitions
2. 5.2. Utilize LUKS Partition Encryption
6. Software Maintenance
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7. System Auditing
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1. 7.1. Audit System Architecture
2. 7.2. Installing the audit Packages
3. 7.3. Configuring the audit Service
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  1. 7.3.1. Configuring auditd for a CAPP Environment
4. 7.4. Starting the audit Service
5. 7.5. Defining Audit Rules
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  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
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  1. 7.9.1. Configuring pam_tty_audit
10. 7.10. Additional Resources
8. Compliance and Vulnerability Scanning with OpenSCAP
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1. 8.1. Security Compliance in Red Hat Enterprise Linux
2. 8.2. Defining Compliance Policy
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3. 8.3. Using SCAP Workbench
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4. 8.4. Using oscap
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  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
    
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    8.4.6.1. OpenSCAP Online Remediation
    
    8.4.6.2. OpenSCAP Offline Remediation
    
    8.4.6.3. OpenSCAP Remediation Review
5. 8.5. Using OpenSCAP with Red Hat Satellite
6. 8.6. Installing USGCB-Compliant System with Kickstart
7. 8.7. Practical Examples
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  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
9. Checking Integrity with AIDE
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10. Federal Standards and Regulations
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1. 10.1. Introduction
2. 10.2. Federal Information Processing Standard (FIPS)
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  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
11. References
A. Encryption Standards
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1. A.1. Synchronous Encryption
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  1. A.1.1. Advanced Encryption Standard - AES
    
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    A.1.1.1. AES History
  2. A.1.2. Data Encryption Standard - DES
    
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    A.1.2.1. DES History
2. A.2. Public-key Encryption
  Expand section "A.2. Public-key Encryption" Collapse section "A.2. Public-key Encryption"
  1. A.2.1. Diffie-Hellman
    
    Expand section "A.2.1. Diffie-Hellman" Collapse section "A.2.1. Diffie-Hellman"
    
    A.2.1.1. Diffie-Hellman History
  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
B. Audit System Reference
Expand section "B. Audit System Reference" Collapse section "B. Audit System Reference"
1. B.1. Audit Event Fields
2. B.2. Audit Record Types
C. Revision History
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9.5. Additional Resources

For additional information on AIDE, see the following documentation:

aide(1) man page
aide.conf(5) man page
Guide to the Secure Configuration of Red Hat Enterprise Linux 7 (OpenSCAP Security Guide): Verify Integrity with AIDE
The AIDE manual

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9.5. Additional Resources