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Fixing Strange Directory Write Access

type=AVC msg=audit(1403622580.061:96): avc:  denied  { write } for  pid=1331 comm="mysqld_safe" name="/" dev="dm-0" ino=256 scontext=system_u:system_r:mysqld_safe_t:s0 tcontext=system_u:object_r:root_t:s0 tclass=dir type=SYSCALL msg=audit(1403622580.061:96): arch=c000003e syscall=269 success=yes exit=0 a0=ffffffffffffff9c a1=7f5e09bfe798 a2=2 a3=2 items=0 ppid=1109 pid=1331 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="mysqld_safe" exe="/bin/dash" subj=system_u:system_r:mysqld_safe_t:s0 key=(null)

For a long time (probably years) I’ve been seeing messages like [...]

Replacement Credit Cards and Bank Failings

I just read an interesting article by Brian Krebs about the difficulty in replacing credit cards [1].

The main reason that credit cards need to be replaced is that they have a single set of numbers that is used for all transactions. If credit cards were designed properly for modern use (IE since 2000 or [...]

Fingerprints and Authentication

Dustin Kirkland wrote an interesting post about fingerprint authentication [1]. He suggests using fingerprints for identifying users (NOT authentication) and gives an example of a married couple sharing a tablet and using fingerprints to determine who’s apps are loaded.

In response Tollef Fog Heen suggests using fingerprints for lightweight authentication, such as resuming a session [...]

Dr Suelette Dreyfus LCA Keynote

Dr Suelette Dreyfus gave an interesting LCA keynote speech on Monday (it’s online now for people who aren’t attending LCA [1]). One of the interesting points she made was regarding the greater support for privacy protection in Germany, this is apparently due to so many German citizens having read their own Stasi files.

The section [...]

Security is Impossible

The Scope of the Problem

Security is inherently complex because of the large number of ways of circumventing it. For example Internet facing servers have been successfully attacked based on vulnerabilities in the OS, the server application, public key generation, DNS, SSL key certificates (and many other programs and algorithms in use), as well as [...]

SE Linux Things To Do

At the end of my talk on Monday about the status of SE Linux [1] I described some of the things that I want to do with SE Linux in Debian (and general SE Linux stuff). Here is a brief summary of some of them:

One thing I’ve wanted to do for years is to [...]

My SE Linux Status Report – LCA 2013

This morning I gave a status report on SE Linux. The talk initially didn’t go too well, I wasn’t in the right mental state for it and I moved through the material too fast. Fortunately Casey Schaufler asked some really good questions which helped me to get back on track. The end result seemed reasonably [...]

Finding an ATM Skimmer

A member of SAGE-AU [1] found two ATM skimmers [2] and gave me permission to publish his description and analysis of the situation. I’ve lightly edited this from a mailing list post to a blog format with permission from the author. This Courier-Mail article refers to the skimmers in question [3].

People were wondering what [...]

New SE Linux Policy for Wheezy

I’ve just uploaded a new SE Linux policy for Debian/Wheezy. It now works correctly with systemd and Chromium, two significant features that I wanted for Wheezy. Now it turns out that we have until the end of the month for Wheezy updates, so I may get another version of the policy uploaded before then. If [...]

Debian SE Linux Status June 2012

It’s almost the Wheezy freeze time and I’ve been working frantically to get things working properly.

Policy Status

At the moment I’m preparing an upload of the policy which will support KDE (and probably most desktop environment) logins and many little fixes related to server operations (particularly MTAs). I would like to get another version [...]