Revisiting Linux Part 1: A Look at Ubuntu 8.04
by Ryan Smith on August 26, 2009 12:00 AM EST- Posted in
- Linux
It's Free – Libre
While the value of “free as in beer” is easy to describe, the value of “free as in speech – otherwise known as libre – is harder to relate. Nonetheless, rather large books have been written on the subject, so we'll try to stick with something condensed.
Virtually everything distributed with Ubuntu is an open source program in some manner. Many of the components of Ubuntu, such as the Linux kernel and the GNU toolset, are licensed under the GNU General Public License (GPL), which in a nutshell requires that any software distributed under the GPL license either include the source code with the software or a way to get the source code. Other bits of Ubuntu are under slightly different licenses with slightly different legal requirements, but the outcome is effectively the same. Ubuntu is free - you can get the source code to it and modify/distribute it as you see fit.
But when we're talking about Ubuntu, there's more than just being able to access the source, as most of the development teams that are responsible for the programs included in Ubuntu have their projects open for public participation. So not only can you take the code and modify it, but if your modifications are good enough they can be submitted back to the main project and possibly be included in a future version of the software. The fundamental idea of open source software is that users are empowered to see how software works and to modify it as they see fit. Other lesser benefits also exist, such as protecting authors' rights by preventing people from taking the code and improving it without sharing it (the GPL), and making sure all the authors are properly credited.
This does not always make open source relevant for the user however. The fundamental benefits of open source software are for people that are programmers, but most users are not programmers. Being able to see and edit the code is not necessarily useful if you don't know how to use it. Even with a background in programming, I would be hard pressed to be able to quickly contribute significant code changes to most projects; very few programs are small and simple enough to be able to easily jump into these days.
Still, there are some definite benefits for those of us that can't throw out code like Linux's chief architect Linus Torvalds. The most direct benefit of course is that this software exists at all. Since all of the software in Ubuntu is free as in beer, paid developers do not develop many of the programs. Open source as a default state makes it easier for people to contribute to the development of software, and that means it's easier for such gratis software to be continually developed in the first place.
Open source software is also a benefit for the longevity of software. Since no one person has absolute control over a project, no one can terminate it. This means that someone else can pick up a project and continue should the original developer(s) quit, as is sometimes the case with old software. It also allows for software to be forked, which is to take the code from a project and create a derivative separate from the original project – the benefit being that a forked project can be taken in a different direction than the original developer may want. As proof of the importance of forking, there are a number of programs in Ubuntu that are forks of older projects, such as X11 (otherwise known as just X), Ubuntu's base windowing system.
Finally, open source software is beneficial to overall software security. If you can see the source, you can analyze it for possible bugs. If you can edit the source, you can fix those bugs rather than wait for someone else to do so - and we can't even begin to overstate the importance of this. The direct relevance to the average user is once again limited here since most people cannot read or write code, but it does filter down through benefits such as rapid patching of security vulnerabilities in some cases. The security benefits of Ubuntu being open source are some of the most important reasons we consider Ubuntu to be secure.
In short: even if you can't code you benefit from Ubuntu being a free (libre) operating system.
Facebook
Twitter
RSS
195 Comments
View All Comments
ioannis - Wednesday, August 26, 2009 - link
...sorry, I think it's Alt+F2 by default. I'm talking about the 'Run Command' dialog.Eeqmcsq - Wednesday, August 26, 2009 - link
Oh, yes you're right. I stand corrected.sprockkets - Wednesday, August 26, 2009 - link
Ubuntu doesn't ship with the firewall on eh? Weird. SuSE's is on, and that has been the default for quite some time. GUI management of it is easy too.clarkn0va - Wednesday, August 26, 2009 - link
For incoming connections I don't quite grasp what good a firewall will do on a system with no internet-facing services. With no open ports you stand little to gain from adding a firewall, and any internet-facing service you might add, well, you don't want to firewall that anyway.I can see two theoretically plausible arguments for a host-based firewall, but even these don't really stand up in real-world use: 1) a machine that has open ports out of the box (I'm looking at you, Windows), and 2) for the folks who want to police outgoing connections.
In the case of the former, why would we open ports and then block them with a firewall, right out of the box? This makes as much sense to me as MS marketing their own antivirus. Third-party firewalls were rightfully introduced to remedy the silly situation of computers listening on networks where they shouldn't be, but the idea of MS producing a host-based firewall instead of just cleaning up their services profile defies common sense.
In the case of outbound firewalling, I've yet to meet a home user that understood his/her outbound firewall and managed it half-way effectively. Good in theory, usually worse than useless in practice.
db
VaultDweller - Wednesday, August 26, 2009 - link
Just because a port/service is open, doesn't mean you want it open to the whole world.Examples:
SMB
NFS
VNC
RDP
SSH
Web (intranet sites, for example)
And the list could go on... and on and on and on, really.
Also, it's erroneous to assume that only 1st party software will want to open ports.
And that is to say nothing of the possibility of ports being unintentionally opened by rogue software, poorly documented software, naughty admins, or clumsy admins.
Host-based firewalls help with all of these situations.
clarkn0va - Wednesday, August 26, 2009 - link
Windows firewall doesn't filter by source. In other words, if you want SMB or any other service open to some peers and not others, Windows firewall can't help you; you'll need a more sophisticated product or a hardware firewall for that.I'm not saying there's no case for host-based firewalls, I'm just saying it's pointless for most users out of the box, where Ubuntu doesn't need it and Windows should be looking at fixing the problem of unneeded services running, rather than just bolting on another fix.
VaultDweller - Wednesday, August 26, 2009 - link
"I can see two theoretically plausible arguments for a host-based firewall, but even these don't really stand up in real-world use"That sounds to me like a claim that there is little or no case for a host-based firewall; at least, that's how I interpreted it.
"Windows firewall doesn't filter by source. In other words, if you want SMB or any other service open to some peers and not others, Windows firewall can't help you"
That is incorrect, and you should check your facts before making such statements. The Windows Firewall can filter by source. Any firewall exception that is created can be made to apply to all sources, to the local subnet only, or to a custom list of IPs and subnets.
The firewall in Vista and Windows 7 goes a step further, as it is location aware. Different ports and services are opened depending on the network you're plugged into, as exemplified by the default behavior of treating all new networks as "Public" (unknown and untrusted) until instructed otherwise.
clarkn0va - Wednesday, August 26, 2009 - link
"The Windows Firewall can filter by source. Any firewall exception that is created can be made to apply to all sources, to the local subnet only, or to a custom list of IPs and subnets. "In that case I retract my assertion that an out-of-the-box firewall makes no sense in the case of Windows.
As for Ubuntu, or any other desktop OS having no open ports by default, I still see including an enabled firewall by default as superfluous. Meanwhile, firewall GUIs exist for those wishing to add them.
Paazel - Wednesday, August 26, 2009 - link
...not enough pictures. admittedly my interest additionally waned when i read the newest ubuntu isn't be reviewed.philosofool - Wednesday, August 26, 2009 - link
I'm not done with this article, which I'm loving. However, there's a grammatical/spelling quibble that's driving me nuts: "nevertheless" is one world.