Documentation

Copying a Linux Kernel From One System to Another

Details: Category: Linux; Published: Saturday, 16 May 2015 14:53; Written by Ben Tasker

There may be occasions where, for testing purposes, you want to copy a kernel from one machine to another.

There are some fairly self-explanatory caveats:

The donor and target system must be running on the same architecture
The target machine shouldn't have any (important) hardware that's unsupported by your donor kernel

Obviously, you'll ideally want to make sure that the hardware is as close to identical as possible (otherwise your testing may be invalid) so the above should be considered a minimum

sar Cheatsheet

Details: Category: Linux; Published: Tuesday, 21 April 2015 04:07; Written by Ben Tasker

sar can be an incredibly helpful utility when examining system performance, but if not used regularly it's easy to forget which flags to use.

This short post details a number of useful arguments to pass

Avoiding BCC Leaks with Exim

Details: Category: Linux; Published: Friday, 30 January 2015 23:33; Written by Ben Tasker

This issue is, by no means, Joomla specific - but Joomla's mass mail functionality provides a good example of what can go wrong.

The expectation that most users have, is that the list of recipients BCC'd on an email will never be visible to any of those recipients.

Unfortunately, whether or not that's the case may well depend on the Mail Transport Agent (MTA) that you are using.

Those familiar with Joomla's Mass Mail feature will know that by default, recipients are BCC'd - unfortunately, if you're using Exim (which most CPanel servers, for example, are) then you may in fact find that those receiving your message can see exactly who it was sent to.

Whether or not this BCC Leak is visible to the recipients will depend on what mail client they use (assuming they're not in the habit of looking at the mail headers anyway....), but those using Google Apps/Google Mail will have the list clearly presented to them when viewing the mail.

ls -l Shows Question Marks instead of Permissions

Details: Category: Linux; Published: Tuesday, 21 April 2015 03:39; Written by Ben Tasker

Occasionally, when running ls -l within a directory, you might find that the output shows question marks (?) instead of the usual permissions indicators:

ben@Queeg:~$ ls -l ~/test
ls: cannot access /var/www/html/Vx/Notes: Permission denied
total 0
d????????? ? ? ? ?            ? Notes

PGP Encrypted Text Chat Via DNS

Details: Category: Security; Published: Friday, 16 January 2015 08:15; Written by Ben Tasker

In a recent post, I alluded to having given a little bit of thought to ways in which clandestine communications could be achieved.

Having given a little more thought to the idea, I was unable to resist the temptation to build a small proof of concept - if only to see whether there were any obstacles that I hadn't considered.

This post is the documentation for DNSChat - a small proof of concept enabling PGP encrypted text chat using DNS Queries as a transport mechanism

BenTasker.co.uk

Documentation

Copying a Linux Kernel From One System to Another

sar Cheatsheet

Avoiding BCC Leaks with Exim

ls -l Shows Question Marks instead of Permissions

PGP Encrypted Text Chat Via DNS

More Articles ...