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Guide to the Secure Configuration of Anolis OS 23

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  • Configure Security Tools to Improve System Robustness

    Several tools exist which can be effectively used to improve a system's resistance to and detection of unknown attacks. These tools can improve rob...
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  • How to Use This Guide

    Readers should heed the following points when using the guide.
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  • Formatting Conventions

    Commands intended for shell execution, as well as configuration file text, are featured in a <code>monospace font</code>. <i>Italics</i> are used t...
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  • Read Sections Completely and in Order

    Each section may build on information and recommendations discussed in prior sections. Each section should be read and understood completely; instr...
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  • Reboot Required

    A system reboot is implicitly required after some actions in order to complete the reconfiguration of the system. In many cases, the changes will n...
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  • Root Shell Environment Assumed

    Most of the actions listed in this document are written with the assumption that they will be executed by the root user running the <code>/bin/bash...
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  • Dectivate firewalld Rules

    Firewalls can be used to separate networks into different zones based on the level of trust the user has decided to place on the devices and traffi...
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  • Install iptables Package

    The iptables package can be installed with the following command: 
    $ sudo yum install iptables
    Rule Medium Severity
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  • Network Manager

    The NetworkManager daemon configures a variety of network connections. This section discusses how to configure NetworkManager.
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  • NetoworkManager DNS Mode

    This sets how NetworkManager handles DNS. none - NetworkManager will not modify resolv.conf. default - NetworkManager will update /etc/resolv.con...
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  • Verify File Hashes with RPM

    Without cryptographic integrity protections, system executables and files can be altered by unauthorized users without detection. The RPM package m...
    Rule High Severity
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  • Verify and Correct File Permissions with RPM

    The RPM package management system can check file access permissions of installed software packages, including many that are important to system sec...
    Rule High Severity
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  • Ensure /dev/shm is configured

    The <code>/dev/shm</code> is a traditional shared memory concept. One program will create a memory portion, which other processes (if permitted) ca...
    Rule Low Severity
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  • Ensure PAM Displays Last Logon/Access Notification

    To configure the system to notify users of last logon/access using <code>pam_lastlog</code>, add or correct the <code>pam_lastlog</code> settings i...
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  • Set Interactive Session Timeout

    Setting the <code>TMOUT</code> option in <code>/etc/profile</code> ensures that all user sessions will terminate based on inactivity. The value of ...
    Rule Medium Severity
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  • Ensure auditd Collects Information on Kernel Module Loading and Unloading

    To capture kernel module loading and unloading events, use following lines, setting ARCH to either b32 for 32-bit system, or having two lines for b...
    Rule Medium Severity
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  • Record Attempts to Alter Logon and Logout Events

    The audit system already collects login information for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenr...
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  • Type of hostname to record the audit event

    Type of hostname to record the audit event
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  • Restrict unprivileged access to the kernel syslog

    Enforce restrictions on unprivileged users reading the kernel syslog via dmesg(8). The configuration that was used to build kernel is available at...
    Rule Medium Severity
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  • Ensure Log Files Are Owned By Appropriate Group

    The group-owner of all log files written by <code>rsyslog</code> should be <code>root</code>. These log files are determined by the second part of ...
    Rule Medium Severity
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