Entries tagged openldap

Related tags: backports, cfengine, chef, itag, ldap, lenny, mutt, openbsd, puppet, radius, work.

OepnBSD rocks. Until it doesn't.

Monday, 9 August 2010

Recently I've been jumping upon the LDAP bandwagon, with one of my aims to consolidate a lot of different login systems.

Configuring Linux, Apache, OpenVPN and similar things to authenticate against an LDAP server was almost painless.

Unfortunately OpenBSD is being a bit more painful, primarily because it doesn't use PAM. Instead you have two choices:

  • Configure login to authenticate against a RADIUS server, telling that server to authenticate against a (remote) LDAP server.
  • Use login_ldap to do authentication, but fetch all things via YP.

Neither solution is particularly pleasant, but the former is marginally less effort. The downside? I still have to run "adduser" to add the user to the system - which makes me think "why did I bother in the first place?"

Otherwise I spent the tail end of last week in York, taking pictures of ducks, geese, the city walls and similar things of fun.

ObQuote: "Well, well I see we have visitors... " - Hot Fuzz

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New backported packages!

Saturday, 10 July 2010

Since I'm I'm using real titles I guess I should make a real post, in which real things are mentioned. Unfortunately recently most of my time has been spent offline, doing things in and around Edinburgh.

However I have done a few things which are possibly worthy of mention. My Lenny repository has been updated a little:

The Gimp

There's a slightly newer version of The Gimp available now, corresponding to a recent upload to unstable.

gtk-gnutella

Once again I was forced to update the backported gtk-gnutella package, as my previous one was too old to connect to the network.

itag

Finally I added a Lenny package for the itag software which is now essentially complete.

Of those things I had a lot of fun with the itag software. Partly because it allows me to horde my images in a way that I appreciate, but also because it made me go over some older images and be pleasantly suprised.

My personal archive, ~/Images, is now just over 80Gb, and goes back about ten years. (Of course the older images were taken with random point and shoot digital cameras and each images is only a few hundred k in size. The newer images, saved at full-resolution, may be 5Mb each.)

Otherwise I've been slowly deploying OpenLDAP in anger, which has been educational. I've got a minor problem to solve which is that (posix)group definitions don't seem to be working reliably, but otherwise I've got Apache authenticating against groups, SSH logins working, and the little brother database using the LDAP server as an address book. (Mail clients? mutt is the one true mail client. notmuchmail.org will be interesting when further developed, but everything else I'm going to ignore with my stubborn Yorkshire nature ;)

ObQuote: "Oh no no no, dead broad OFF THE TABLE!", from Shrek.

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And if someone gets upset you say, "chill out"!

Friday, 25 December 2009

It was interesting to see Clint Adams describe love and dissatification with configuration management.

At work I've got control of 150(ish) machines which are managed via CFEngine. These machines are exclusively running Debian Lenny. In addition to these hosts we also have several machines running Solaris, OpenBSD, and various Ubuntu releases for different purposes.

Unfortunately I made a mistake when I setup the CFEngine infrastructure and when writing all the policies, files, etc, I essentially said "OK CFEngine controlled? Then it is Debian". (This has been slowly changing over time, but not very quickly.)

But in short this means that the machines running *BSD, Solaris, and non-Debian distributions haven't been managed as well via CFEngine as the rest, even though technically they could have been.

A while back I decided that it was time to deal with this situation. Looking around the various options it seemed Puppet was the way of the future and using that we could rewrite/port our policies and make sure they were both cleanly organised and made no assumptions.

So I setup a puppetmaster machine, then I installed the client on a range of client machines (openbsd, debian lenny, ubuntu, solaris) so that I could convince myself my approach was valid, and that the tool itself could do everything I wanted it to do.

Unfortunately using puppet soon became painful. It has primitives for doing various things such as maintaining local users, working with cronjobs, and similar. Unfortunately not all primitives work upon all platforms, which kinda makes me think "what's the point?". For example the puppet client running upon FreeBSD will let you add a local user, setup a ~/.ssh/authorized_keys file but will not let you setup a password. (Which means you can add users who can login, but then cannot use sudo. Subpar)

At this point I've taken a step back. As I think I've mentioned before I don't actually do too much with CFEngine. Just a few jobs:

  • Fetch a file from the master machine and copy into the local filesystem. (Making no changes.)
  • Fetch a file from the master machine, move it to the local system after applying a simple edit. (e.g "s/##HOSTNAME##/`hostname`/g")
  • Install a package.
  • Purge a package.
  • Setup local user accounts, with ~/.ssh handled properly.
  • Apply one-line sed-style edits to files. (e.g. "s/ENABLED=no/ENABLED=yes/" /etc/default/foo)

(i.e. I don't use cron facilities, I add files to cron directories. Similarly I don't use process monitoring, instead I install the monit package and drop /etc/monit/monitrc into place.)

There is a pretty big decision to make in the future with the alternatives being:

  • Look at Chef.
  • Stick with CFEngine but start again with a better layout, with more care and attention to portability things.
  • Replace the whole mess with in-house-fu.

If we ignore the handling of local users, and sudo setup, then the tasks that remain are almost trivial. Creating a simple parser for a "toy-language" which can let you define copies, edits, and package operations would be an afternoons work. Then add some openssl key authentication and you've got a cfengine-lite.

For the moment I'm punting the decision but I'm 90% certain that the choice is CFEngine vs. Chef vs. In-House-Fu - and that puppet is no longer under consideration.

Anyway despite having taken months to arrive at this point I'm going to continue to punt. Instead my plan is to move toward using LDAP for all user management, login stuff, and sudo management. That will be useful in its own right, and it will coincidentally mean that whatever management system we do end up using will have on less task to deal with. (Which can only be a good thing.)

ObFilm: Terminator II

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