Daemons in the North | BSD Now 70

chris

8 years ago

It’s our last episode of 2014, and we’ll be chatting with Dan Langille about the upcoming BSDCan conference. We’ll find out what’s planned and what sorts of presentations they’re looking for. As usual, answers to viewer-submitted questions and all the week’s news, coming up on BSD Now – the place to B.. SD.

Thanks to:

Direct Download:

RSS Feeds:

– Show Notes: –

Headlines

OpenBSD PIE enhancements

ASLR and PIE are great security features that OpenBSD has had enabled by default for a long time, in both the base system and ports, but they have one inherent problem
They only work with dynamic libraries and binaries, so if you have any static binaries, they don’t get the same treatment
For example, the default shells (and many other things in /bin and /sbin) are statically linked
In the case of the static ones, you can always predict the memory layout, which is very bad and sort of defeats the whole purpose
With this and a few related commits, OpenBSD fixes this by introducing static self-relocation
More and more CPU architectures are being tested and getting support too; this isn’t just for amd64 and i386 – VAX users can rest easy
It’ll be available in 5.7 in May, or you can use a -current snapshot if you want to get a slice of the action now

FreeBSD foundation semi-annual newsletter

The FreeBSD foundation publishes a huge newsletter twice a year, detailing their funded projects and some community activities
As always, it starts with a letter from the president of the foundation – this time it’s about encouraging students and new developers to get involved
The article also has a fundraising update with a list of sponsored projects, and they note that the donations meter has changed from dollars to number of donors (since they exceeded the goal already)
You can read summaries of all the BSD conferences of 2014 and see a list of upcoming ones next year too
There are also sections about the FreeBSD Journal‘s progress, a new staff member and a testimonial from NetApp
It’s a very long report, so dedicate some time to read all the way through it
This year was pretty great for BSD: both the FreeBSD and OpenBSD foundations exceeded their goals and the NetBSD foundation came really close too
As we go into 2015, consider donating to whichever BSD you use, it really can make a difference

Modernizing OpenSSH fingerprints

When you connect to a server for the first time, you’ll get what’s called a fingerprint of the host’s public key – this is used to verify that you’re actually talking to the same server you intended to
Up until now, the key fingerprints have been an MD5 hash, displayed as hex
This can be problematic, especially for larger key types like RSA that give lots of wiggle room for collisions, as an attacker could generate a fake host key that gives the same MD5 string as the one you wanted to connect to
This new change replaces the default MD5 and hex with a base64-encoded SHA256 fingerprint
You can add a “FingerprintHash” line in your ssh_config to force using only the new type
There’s also a new option to require users to authenticate with more than one public key, so you can really lock down login access to your servers – also useful if you’re not 100% confident in any single key type
The new options should be in the upcoming 6.8 release

Interview – Dan Langille – info@bsdcan.org / @bsdcan

Plans for the BSDCan 2015 conference

News Roundup

Introducing ntimed, a new NTP daemon

As we’ve mentioned before in our tutorials, there are two main daemons for the Network Time Protocol – ISC’s NTPd and OpenBSD’s OpenNTPD
With all the recent security problems with ISC’s NTPd, Poul-Henning Kamp has been working on a third NTP daemon
It’s called “ntimed” and you can try out a preview version of it right now – it’s in FreeBSD ports or on Github
PHK also has a few blog entries about the project, including status updates

OpenBSD-maintained projects list

There was recently a read on the misc mailing list asking about different projects started by OpenBSD developers
The initial list had marks for which software had portable versions to other operating systems (OpenSSH being the most popular example)
A developer compiled a new list from all of the replies to that thread into a nice organized webpage
Most people are only familiar with things like OpenSSH, OpenSMTPD, OpenNTPD and more recently LibreSSL, but there are quite a lot more
This page also serves as a good history lesson for BSD in general: FreeBSD and others have ported some things over, while a couple OpenBSD tools were born from forks of FreeBSD tools (mergemaster, pkg tools, portscout)

Monitoring network traffic with FreeBSD

If you’ve ever been curious about monitoring network traffic on your FreeBSD boxes, this forum post may be exactly the thing for you
It’ll show you how to combine the Netflow, NfDump and NfSen suite of tools to get some pretty detailed network stats (and of course put them into a fancy webpage)
This is especially useful for finding out what was going on at a certain point in time, for example if you had a traffic spike

Trapping spammers with spamd

This is a blog post about OpenBSD’s spamd – a spam email deferral daemon – and how to use it for your mail
It gives some background on the greylisting approach to spam, rather than just a typical host blacklist
“Greylisting is a method of defending e-mail users against spam. A mail transfer agent (MTA) using greylisting will “temporarily reject” any email from a sender it does not recognize. If the sender re-attempts mail delivery at a later time, the sender may be allowed to continue the mail delivery conversation.”
The post also shows how to combine it with PF and other tools for a pretty fancy mail setup
You can find spamd in the OpenBSD base system, or use it with FreeBSD or NetBSD via ports and pkgsrc
You might also want to go back and listen to BSDTalk episode 68, where Will talks to Bob Beck about spamd

Feedback/Questions

Mailing List Gold

Send questions, comments, show ideas/topics, or stories you want mentioned on the show to feedback@bsdnow.tv – if you do anything cool with BSD, tell us about it
Watch live Wednesdays at 2:00PM Eastern (19:00 UTC)
Have a happy new year – make 2015 the year you finally switch over to BSD