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Guide to the Secure Configuration of Anolis OS 23

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Verify Group Ownership of System Login Banner

    To properly set the group owner of /etc/issue, run the command: 
    $ sudo chgrp root /etc/issue
    Rule Medium Severity
    Show

  • Verify Group Ownership of Message of the Day Banner

    To properly set the group owner of /etc/motd, run the command: 
    $ sudo chgrp root /etc/motd
    Rule Medium Severity
    Show

  • Verify ownership of System Login Banner

    To properly set the owner of /etc/issue, run the command: 
    $ sudo chown root /etc/issue
    Rule Medium Severity
    Show

  • Verify ownership of Message of the Day Banner

    To properly set the owner of /etc/motd, run the command: 
    $ sudo chown root /etc/motd
    Rule Medium Severity
    Show

  • Verify permissions on System Login Banner

    To properly set the permissions of /etc/issue, run the command: 
    $ sudo chmod 0644 /etc/issue
    Rule Medium Severity
    Show

  • Verify permissions on Message of the Day Banner

    To properly set the permissions of /etc/motd, run the command: 
    $ sudo chmod 0644 /etc/motd
    Rule Medium Severity
    Show

  • Password Hashing algorithm

    Specify the system default encryption algorithm for encrypting passwords. Defines the value set as ENCRYPT_METHOD in /etc/login.defs.
    Value
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  • remember

    The last n passwords for each user are saved in <code>/etc/security/opasswd</code> in order to force password change history and keep the user from alternating between the same password too frequen...
    Value
    Show

  • Disallow Configuration to Bypass Password Requirements for Privilege Escalation

    Verify the operating system is not configured to bypass password requirements for privilege escalation. Check the configuration of the "/etc/pam.d/sudo" file with the following command: <pre>$ sudo...
    Rule Medium Severity
    Show

  • Set Lockouts for Failed Password Attempts

    The <code>pam_faillock</code> PAM module provides the capability to lock out user accounts after a number of failed login attempts. Its documentation is available in <code>/usr/share/doc/pam-VERSIO...
    Group
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  • fail_deny

    Number of failed login attempts before account lockout
    Value
    Show

  • fail_unlock_time

    Seconds before automatic unlocking or permanently locking after excessive failed logins
    Value
    Show

  • tally2_unlock_time

    Seconds before automatic unlocking or permanently locking after excessive failed logins
    Value
    Show

  • pwhistory_remember

    Prevent password re-use using password history lookup
    Value
    Show

  • PAM pwhistory remember - control flag

    'Specify the control flag required for password remember requirement. If multiple values are allowed write them separated by commas as in "required,requisite", for remediations the first value will...
    Value
    Show

  • tally2

    Number of failed login attempts
    Value
    Show

  • Account Lockouts Must Be Logged

    PAM faillock locks an account due to excessive password failures, this event must be logged.
    Rule Medium Severity
    Show

  • Account Lockouts Must Be Logged

    PAM faillock locks an account due to excessive password failures, this event must be logged.
    Rule Medium Severity
    Show

  • Set Password Quality Requirements

    The default <code>pam_pwquality</code> PAM module provides strength checking for passwords. It performs a number of checks, such as making sure passwords are not similar to dictionary words, are of...
    Group
    Show

  • Set Password Quality Requirements with pam_pwquality

    The <code>pam_pwquality</code> PAM module can be configured to meet requirements for a variety of policies. <br> <br> For example, to configure <code>pam_pwquality</code> to require at lea...
    Group
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  • dcredit

    Minimum number of digits in password
    Value
    Show

  • lcredit

    Minimum number of lower case in password
    Value
    Show

  • minclass

    Minimum number of categories of characters that must exist in a password
    Value
    Show

  • minlen

    Minimum number of characters in password
    Value
    Show

  • retry

    Number of retry attempts before erroring out
    Value
    Show

  • Require Authentication for Single User Mode

    Single-user mode is intended as a system recovery method, providing a single user root access to the system by providing a boot option at startup. <br> <br> By default, single-user mode is ...
    Rule Medium Severity
    Show

  • Ensure PAM Enforces Password Requirements - Minimum Length

    The pam_pwquality module's <code>minlen</code> parameter controls requirements for minimum characters required in a password. Add <code>minlen=<xccdf-1.2:sub idref="xccdf_org.ssgproject.content_val...
    Rule Medium Severity
    Show

  • Ensure PAM Enforces Password Requirements - Authentication Retry Prompts Permitted Per-Session

    To configure the number of retry prompts that are permitted per-session: Edit the <code>pam_pwquality.so</code> statement in <code>/etc/pam.d/system-auth</code> to show <code>retry=<xccdf-1.2:s...
    Rule Medium Severity
    Show

  • Set Password Hashing Algorithm

    The system's default algorithm for storing password hashes in /etc/shadow is SHA-512. This can be configured in several locations.
    Group
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  • Protect Physical Console Access

    It is impossible to fully protect a system from an attacker with physical access, so securing the space in which the system is located should be considered a necessary step. However, there are some...
    Group
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  • Protect Accounts by Restricting Password-Based Login

    Conventionally, Unix shell accounts are accessed by providing a username and password to a login program, which tests these values for correctness using the <code>/etc/passwd</code> and <code>/etc/...
    Group
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  • Ensure All Accounts on the System Have Unique User IDs

    Change user IDs (UIDs), or delete accounts, so each has a unique name.
    Rule Medium Severity
    Show

  • Ensure All Groups on the System Have Unique Group ID

    Change the group name or delete groups, so each has a unique id.
    Rule Medium Severity
    Show

  • Ensure All Groups on the System Have Unique Group Names

    Change the group name or delete groups, so each has a unique name.
    Rule Medium Severity
    Show

  • number of days after a password expires until the account is permanently disabled

    The number of days to wait after a password expires, until the account will be permanently disabled.
    Value
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  • Ensure All Accounts on the System Have Unique Names

    Ensure accounts on the system have unique names. To ensure all accounts have unique names, run the following command: <pre>$ sudo getent passwd | awk -F: '{ print $1}' | uniq -d</pre> If a usernam...
    Rule Medium Severity
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  • Use Centralized and Automated Authentication

    Implement an automated system for managing user accounts that minimizes the risk of errors, either intentional or deliberate. This system should integrate with an existing enterprise user managemen...
    Rule Medium Severity
    Show

  • maximum password age

    Maximum age of password in days
    Value
    Show

  • minimum password age

    Minimum age of password in days
    Value
    Show

  • minimum password length

    Minimum number of characters in password
    Value
    Show

  • warning days before password expires

    The number of days' warning given before a password expires.
    Value
    Show

  • Set Password Maximum Age

    To specify password maximum age for new accounts, edit the file <code>/etc/login.defs</code> and add or correct the following line: <pre>PASS_MAX_DAYS <xccdf-1.2:sub idref="xccdf_org.ssgproject.con...
    Rule Medium Severity
    Show

  • Set Existing Passwords Maximum Age

    Configure non-compliant accounts to enforce a <xccdf-1.2:sub idref="xccdf_org.ssgproject.content_value_var_accounts_maximum_age_login_defs" use="legacy"></xccdf-1.2:sub>-day maximum password lifeti...
    Rule Medium Severity
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  • Verify Proper Storage and Existence of Password Hashes

    By default, password hashes for local accounts are stored in the second field (colon-separated) in <code>/etc/shadow</code>. This file should be readable only by processes running with root credent...
    Group
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  • Verify All Account Password Hashes are Shadowed

    If any password hashes are stored in <code>/etc/passwd</code> (in the second field, instead of an <code>x</code> or <code>*</code>), the cause of this misconfiguration should be investigated. The a...
    Rule Medium Severity
    Show

  • Ensure all users last password change date is in the past

    All users should have a password change date in the past.
    Rule Medium Severity
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  • All GIDs referenced in /etc/passwd must be defined in /etc/group

    Add a group to the system for each GID referenced without a corresponding group.
    Rule Low Severity
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  • Prevent Login to Accounts With Empty Password

    If an account is configured for password authentication but does not have an assigned password, it may be possible to log into the account without authentication. Remove any instances of the <code>...
    Rule High Severity
    Show

  • Ensure There Are No Accounts With Blank or Null Passwords

    Check the "/etc/shadow" file for blank passwords with the following command: <pre>$ sudo awk -F: '!$2 {print $1}' /etc/shadow</pre> If the command returns any results, this is a finding. Configure ...
    Rule High Severity
    Show

  • Verify No netrc Files Exist

    The <code>.netrc</code> files contain login information used to auto-login into FTP servers and reside in the user's home directory. These files may contain unencrypted passwords to remote FTP serv...
    Rule Medium Severity
    Show

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