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UBAC and SE Linux in Debian

A recent development in SE Linux policy is the concept of UBAC (User Based Access Control) which prevents SE Linux users (identitied) from accessing each other’s files.

SE Linux user identities may map 1:1 to Unix users (as was required in the early versions of SE Linux), you might have unique identities for special users […]

Google Chrome and SE Linux

[107108.433300] chrome[12262]: segfault at bbadbeef ip 0000000000fbea18 sp 00007fffcf348100 error 6 in chrome[400000+27ad000]

When I first tried running the Google Chrome web browser [1] on SE Linux it recursively displayed the error message in the above picture, it first displayed the error and then displayed another error while trying to display a web page […]

systemd – a Replacement for init etc

The systemd projecct is an interesting concept for replacing init and related code [1]. There have been a few attempts to replace the old init system, upstart is getting some market share in Linux distributions and Solaris has made some interesting changes too.

But systemd is more radical and offers more benefits. While it’s nice […]

Upgrading a SE Linux system to Debian/Testing (Squeeze)

Upgrade Requirements

Debian/Squeeze (the next release of Debian) will be released some time later this year. Many people are already upgrading test servers, and development systems and workstations that are used to develop code that will be deployed next year. Also there are some significant new features in Squeeze that compel some people to upgrade […]

The Yubikey

Some time ago Yubico were kind enough to send me an evaluation copy of their Yubikey device. I’ve finally got around to reviewing it and making deployment plans for buying some more. Above is a picture of my Yubikey on the keyboard of my Thinkpad T61 for scale. The newer keys apparently have a […]

Types of Security Tokens

The Security Token Wikipedia page doesn’t seem to clearly describe the types of token.

Categories of Security Token

It seems to me that the following categories encompass all security tokens:

Biometric tokens – which seems rather pointless to me. Having a device I control verify my biometric data doesn’t seem to provide a benefit. The […]

Designing a Secure Linux System

The Threat

Bruce Schneier’s blog post about the Mariposa Botnet has an interesting discussion in the comments about how to make a secure system [1]. Note that the threat is considered to be remote attackers, that means viruses and trojan horses – which includes infected files run from USB devices (IE you aren’t safe just […]

Opera and Trusting Applications vs Trusting Servers

The Opera-Mini Dispute

I have just read an interesting article about the Opera browser [1]. The article is very critical of Opera-Mini on the iPhone for many reasons – most of which don’t interest me greatly. There are lots of technical trade-offs that you can make when designing an application for a constrained environment (EG […]

Play Machine Online Again

I have returned from the US and my SE Linux Play Machine [1] is online again.

It was unfortunate that I forgot to pack one of my Play machine shirts, I ended up attending a meeting of the SDForum [2] on the topic of Cloud Security (it was a joint meeting of the Cloud Services […]

Play Machine Offline for 2 Weeks

I’m about to leave for San Francisco, so my SE Linux Play Machine is turned off and will remain off until after I return.

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