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Guide to the Secure Configuration of openSUSE

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Set Default iptables Policy for Forwarded Packets

    To set the default policy to DROP (instead of ACCEPT) for the built-in FORWARD chain which processes packets that will be forwarded from one interface to another, add or correct the following line ...
    Rule Medium Severity
    Show

  • IPv6

    The system includes support for Internet Protocol version 6. A major and often-mentioned improvement over IPv4 is its enormous increase in the number of available addresses. Another important featu...
    Group
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  • Disable Support for IPv6 Unless Needed

    Despite configuration that suggests support for IPv6 has been disabled, link-local IPv6 address auto-configuration occurs even when only an IPv4 address is assigned. The only way to effectively pre...
    Group
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  • Disable IPv6 Networking Support Automatic Loading

    To prevent the IPv6 kernel module (<code>ipv6</code>) from binding to the IPv6 networking stack, add the following line to <code>/etc/modprobe.d/disabled.conf</code> (or another file in <code>/etc/...
    Rule Medium Severity
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  • Kernel Parameters Which Affect Networking

    The sysctl utility is used to set parameters which affect the operation of the Linux kernel. Kernel parameters which affect networking and have security implications are described here.
    Group
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  • Network Related Kernel Runtime Parameters for Hosts and Routers

    Certain kernel parameters should be set for systems which are acting as either hosts or routers to improve the system's ability defend against certain types of IPv4 protocol attacks.
    Group
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  • net.ipv4.conf.default.arp_filter

    Controls whether the ARP filter is enabled or not. 1 - Allows you to have multiple network interfaces on the same subnet, and have the ARPs for each interface be answered based on whether or not t...
    Value
    Show

  • net.ipv4.conf.default.arp_ignore

    Control the response modes for ARP queries that resolve local target IP addresses: 0 - (default): reply for any local target IP address, configured on any interface 1 - reply only if the target IP...
    Value
    Show

  • net.ipv4.conf.all.shared_media

    Controls whether the system can send (router) or accept (host) RFC1620 shared media redirects. <code>shared_media</code> for the interface will be enabled if at least one of conf/{all,interface}/sh...
    Value
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  • Configure ARP filtering for All IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.conf.all.arp_filter</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.conf.all.arp_filter=<xccdf-1.2:sub idref="xccd...
    Rule Medium Severity
    Show

  • Configure Response Mode of ARP Requests for All IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.conf.all.arp_ignore</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.conf.all.arp_ignore=<xccdf-1.2:sub idref="xccd...
    Rule Medium Severity
    Show

  • Prevent Routing External Traffic to Local Loopback on All IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.conf.all.route_localnet</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.conf.all.route_localnet=0</pre> To make su...
    Rule Medium Severity
    Show

  • Configure Sending and Accepting Shared Media Redirects by Default

    To set the runtime status of the <code>net.ipv4.conf.default.shared_media</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.conf.default.shared_media=<xccdf-1.2:sub...
    Rule Medium Severity
    Show

  • Uncommon Network Protocols

    The system includes support for several network protocols which are not commonly used. Although security vulnerabilities in kernel networking code are not frequently discovered, the consequences ca...
    Group
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  • Uncomplicated Firewall (ufw)

    The Linux kernel in Ubuntu provides a packet filtering system called netfilter, and the traditional interface for manipulating netfilter are the iptables suite of commands. iptables provide a compl...
    Group
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  • Disable TIPC Support

    The Transparent Inter-Process Communication (TIPC) protocol is designed to provide communications between nodes in a cluster. To configure the system to prevent the <code>tipc</code> kernel module...
    Rule Low Severity
    Show

  • Verify Permissions on Important Files and Directories

    Permissions for many files on a system must be set restrictively to ensure sensitive information is properly protected. This section discusses important permission restrictions which can be verifie...
    Group
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  • Verify Group Who Owns shadow File

    To properly set the group owner of /etc/shadow, run the command: 
    $ sudo chgrp root /etc/shadow
    Rule Medium Severity
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  • Enable Kernel Parameter to Enforce DAC on Symlinks

    To set the runtime status of the <code>fs.protected_symlinks</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w fs.protected_symlinks=1</pre> To make sure that the setting is...
    Rule Medium Severity
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  • Verify Permissions on Files with Local Account Information and Credentials

    The default restrictive permissions for files which act as important security databases such as <code>passwd</code>, <code>shadow</code>, <code>group</code>, and <code>gshadow</code> files must be ...
    Group
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  • Verify Group Who Owns Backup group File

    To properly set the group owner of /etc/group-, run the command: 
    $ sudo chgrp root /etc/group-
    Rule Medium Severity
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  • Verify Group Who Owns Backup gshadow File

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

  • Verify Group Who Owns Backup passwd File

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

  • Verify User Who Owns Backup shadow File

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

  • Verify Group Who Owns group File

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

  • Verify Group Who Owns gshadow File

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

  • Verify Group Who Owns passwd File

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

  • Verify User Who Owns Backup gshadow File

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

  • Verify User Who Owns Backup passwd File

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

  • Verify Group Who Owns Backup shadow File

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

  • Verify User Who Owns group File

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

  • Verify User Who Owns gshadow File

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

  • Verify User Who Owns passwd File

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

  • Verify User Who Owns shadow File

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

  • Verify Permissions on Backup group File

    To properly set the permissions of /etc/group-, run the command: 
    $ sudo chmod 0644 /etc/group-
    Rule Medium Severity
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  • Verify Permissions on Backup gshadow File

    To properly set the permissions of /etc/gshadow-, run the command: 
    $ sudo chmod 0000 /etc/gshadow-
    Rule Medium Severity
    Show

  • Verify Permissions on Backup passwd File

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

  • Verify Permissions on Backup shadow File

    To properly set the permissions of /etc/shadow-, run the command: 
    $ sudo chmod 0000 /etc/shadow-
    Rule Medium Severity
    Show

  • Verify Permissions on gshadow File

    To properly set the permissions of /etc/gshadow, run the command: 
    $ sudo chmod 0000 /etc/gshadow
    Rule Medium Severity
    Show

  • Verify Permissions on passwd File

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

  • Verify Permissions on Files within /var/log Directory

    The /var/log directory contains files with logs of error messages in the system and should only be accessed by authorized personnel.
    Group
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  • Verify Group Who Owns /var/log Directory

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

  • Verify Group Who Owns /var/log/messages File

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

  • Verify Group Who Owns /var/log/syslog File

    To properly set the group owner of /var/log/syslog, run the command: 
    $ sudo chgrp adm /var/log/syslog
    Rule Medium Severity
    Show

  • Verify User Who Owns /var/log Directory

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

  • Verify User Who Owns /var/log/messages File

    To properly set the owner of /var/log/messages, run the command: 
    $ sudo chown root /var/log/messages
    Rule Medium Severity
    Show

  • Verify User Who Owns /var/log/syslog File

    To properly set the owner of /var/log/syslog, run the command: 
    $ sudo chown syslog /var/log/syslog
    Rule Medium Severity
    Show

  • Verify Permissions on /var/log Directory

    To properly set the permissions of /var/log, run the command: 
    $ sudo chmod 0755 /var/log
    Rule Medium Severity
    Show

  • Verify Permissions on /var/log/messages File

    To properly set the permissions of /var/log/messages, run the command: 
    $ sudo chmod 0640 /var/log/messages
    Rule Medium Severity
    Show

  • Verify Permissions on /var/log/syslog File

    To properly set the permissions of /var/log/syslog, run the command: 
    $ sudo chmod 0640 /var/log/syslog
    Rule Medium Severity
    Show

Node 2

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The content of the drawer really is up to you. It could have form fields, definition lists, text lists, labels, charts, progress bars, etc. Spacing recommendation is 24px margins. You can put tabs in here, and can also make the drawer scrollable.

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