Simplicity is a form of art...

Private key handling and SELinux protection

In this post I'll give some insight in a possible SELinux policy for a script I wrote.

The script is a certificate authority handling script, in which I can generate a private key (and certificate assigned to it), sign the certificate either by itself (for the root CA key) or …

Limiting file access with SELinux alone?

While writing a small script to handle simple certificate authority activities using OpenSSL, I considered how to properly protect the files that OpenSSL uses for these activities. As you are probably aware, a system that hosts the necessary files for CA activities (like signing certificate requests) should be very secure …

Upgrading old Gentoo installations

Today I got "pinged" on bug #463240 about the difficulty of upgrading a Gentoo Linux deployment after a long time of inactivity on the system. We already have an Upgrading Gentoo article on the Gentoo wiki that describes in great detail how upgrades can be accomplished. But one of the …

Giving weights to compliance rules

Now that we wrote up a few OVAL statements and used those instead of SCE driven checks (where possible), let's finish up and go back to the XCCDF document and see how we can put weights in place.

The CVE (Common Vulnerability Exposure) standard allows for vulnerabilities to be given …

Doing a content check with OVAL

Let's create an OVAL check to see if /etc/inittab's single user definitions only refer to /sbin/sulogin or /sbin/rc single. First, the skeleton:

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The first thing we notice is that there are several namespaces defined within OVAL. These namespaces refer to …

What is OVAL?

Time to discuss OVAL (Open Vulnerability Assessment Language). In all the previous posts I focused the checking of rules (does the system comply with the given rule) on scripts, through the Script Check Engine supported by openscap. The advantage of SCE is that most people can quickly provide automated checks …

December hardened meeting

Yesterday evening (UTC, that is) the members of the Gentoo Hardened project filled the #gentoo-hardened IRC channel again - it was time for another online follow-up meeting.

Toolchain

A few patches on the toolchain need to be created to mark SSP as default, but this is just a minor workload.

And …

Remediation through SCAP

I promised in my previous post to give some information about remediation.

Remediation is the process where you fix a system to become compliant again after finding out there is a violation on the system. The easiest form of remediation of course is to just notify the administrator and give …

GPT or MBR in the Gentoo Handbook

I just committed a set of changes against the Gentoo Handbook (x86 and amd64) with the intent to have better instructions on GPT (GUID Partition Table) layout versus MBR (Master Boot Record) or MSDOS-style layout.

The part on "Preparing the Disks" saw the most changes. It starts with explaining the …

Running a bit with the XCCDF document

In my previous post I introduced automated checking of rules through SCE (Script Check Engine). Let's focus a bit more now on running with an XCCDF document: how to automatically check the system, read the results and find more information of those results.

To provide a usable example, you can …