Sam Moffatt @ Pasamio.com » accesscontrol http://pasamio.com Sam Moffatt's Tech Blog: Writings on Technology Sat, 17 Mar 2012 03:24:00 +0000 en hourly 1 http://wordpress.org/?v=3.3.2 Month in review: January http://pasamio.com/2011/02/01/month-in-review-january/ http://pasamio.com/2011/02/01/month-in-review-january/#comments Tue, 01 Feb 2011 07:25:26 +0000 pasamio http://pasamio.com/?p=778 January for me was an interesting and varied month. Here is a quick look back at what I got up to in the month.

Joomla! integration for the Access All Databases
Access All Databases is a USQ system that really screams to be embedded in a CCK style app. It is a set of custom fields, some search and a bit of link tracking. Beyond versioning and approval of edits there is no significant functionality beyond CRUD in this application. At the moment it is a hand built system written in PHP and badly needing redevelopment into a more modular nature. The approach I’ve taken is to experiment with using Joomla! and Flexicontent to rebuild the application from scratch. So far I’m doing well and I’ve managed to recreate the basic look and feel of the site. I’ve got one custom menu module to integrate Flexicontent’s nested categories to emulate the behaviour of another primitive CMS USQ uses called “Finding Information Tutorial.” I’ve done a custom module override for the menu as well to get it using the current USQ look and feel by default. The great thing is that there is a mobile friendly version very easily with standard Joomla! tools. I don’t think I’ll get more time to play with this soon however it is already a good start.

VuFind UConnect SSO
VuFind is the library catalogue system and UConnect is USQ’s custom SSO system that was developed. I’ve gone through and built an integration between the two which looks like the following:

I talk a bit more about VuFind, SSO and authentication in an earlier blog post.

Book Finder
This is primarily the work of Ken MacAlpine who is working on mobile technologies at USQ. Ken developed an SVG powered map of the top floor of the library to aide in the location of books. He put together a database of roughly where the catalogue numbers stop and start for each shelf on each side. It has been integrated into the catalogue and shows up as a “Show on Map” link for Toowoomba Main Collection items.

At some point in the future we will work to expand it to all campuses and collections. When it is clicked it appears in a new window like this:

It is aimed to be the same size as an iPhone display so that it fits neatly there. It also works in all browsers that support SVG. Fallback support is provided for IE since it doesn’t support SVG yet.

ePrints, RPCS and data conversion!
As an interesting exercise I also spent some time converting data from an internal reporting system, RPCS, into our open access repository – ePrints. This was a fun project which required connecting to RPCS’ MSSQL database and outputting an XML file for ePrints to eat. To do this I figured I’d pull out Web Matrix, Microsoft’s cut down editor for web developers. It feels on par with Geany though it has a built in web server, request tracking and a database explorer. It also integrates with the Web Platform Installer product which means I can easily install other applications. I used Web Matrix to kick start the Joomla! install for the Access All Databases research project as well.

The RPCS data is loaded into our ePrints system along side the Author ID project that existed there. We’re also pulling across the data from their system which is going to result in duplicate authors until we merge them down to uniques however doing so in an automated manner isn’t easily possible. There is a whole heap of work to get things together but all in all we’re doing well.

EQUELLA Moodle module
Last but not least I’ve been playing with the EQUELLA Moodle module. It adds an extra option to the Moodle resource drop down and enables access to select items from the EQUELLA repository software.

I’ve used Web Matrix here to deploy out a quick Moodle site utilising the same Web Platform Installer technology and managed to get up and running quickly with everything. The deployment of the module to our main Moodle environment would enable lecturers to directly select course readings to embed in relevant modules on their Moodle course pages – exciting!

]]> http://pasamio.com/2011/02/01/month-in-review-january/feed/ 0 The concept of root http://pasamio.com/2010/04/15/the-concept-of-root/ http://pasamio.com/2010/04/15/the-concept-of-root/#comments Thu, 15 Apr 2010 11:15:31 +0000 pasamio http://pasamio.com/?p=664 Looking through various access control systems, it is interesting to see the different concepts and features. The concept of root, a user with all privileges inalienably granted to it. So let’s have a look at how this works for Windows, Linux and Joomla!’s upcoming 1.6 version.

When you look at Windows, the administrator user and group, is the most powerful user. However the user is granted this through the user of privileges. There are a lot of different privileges available to Windows but they can be removed from the user. Any user can be ‘root’ for a Windows installation, they need not be a special user ID or name to make this happen.

This is contrasted to the UNIX methodology (as seen in Linux/Mac OS X amongst other recent operating systems) where there is a special user ID and username for root across all system. This user inalienably has god rights. It can bypass almost all file system permissions (NFS does deny root typically) and you can run everything that might not necessarily be permitted such as binding to a privileged port. Linux has the same sort of feature that Windows does as privileges except they call it capabilities. Whilst privileges in Windows are additive (you give someone privileges), capabilities in Linux are more subtractive – you start with everything and spawn processes until you lose them.

Joomla! 1.6 is itself going to have a root user as well. However it isn’t going to be a normal part of its operation. Root for Joomla! is going to behave like it does in Linux, it will have everything and the idea is that it has the ability to fix the access control lock out that you have created. Jooma! has the middle ground here between Windows and UNIX – not only do you have a super user who can do everything (if you really need it) but you also have the regular access control model which can add administrators as well. In some respects its the best of both world.

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