DNS over TLS: experience from the Go6lab

After the experiment with DPRIVE at IETF99, we thought we’d try to implement it in the Go6lab and see how this actually works in day-to-day reality.

The first step was to take a look at https://dnsprivacy.org/wiki/ as we had a feeling this might be the best source for information around this topic. There’s a ton of info about DNS over TLS, but what we were really looking for was simple instructions on how to setup a recursive DNS server to serve DNS responses over TLS (port 853), as well as how to setup a local client on our device that could talk to the server and accept local DNS queries over TLS, thereby protecting our DNS communications over the Internet.

We decided that running a  TLS proxy was not the way to do it, so we used CentOS 7 VPS with Unbound installed. After some time and with extensive help from Willem Toorop from NLnet Labs (thanks Willem!!!) we managed to navigate the setup process for server and client.

Firstly, we installed the default Unbound from the CentOS7 default yum repositories, which turned out not to be a very good idea, as this version is 1.4.20 Continue reading

State of MAC address randomization

tldr: I went to DragonCon, a conference of 85,000 people, so sniff WiFi packets and test how many phones now uses MAC address randomization. Almost all iPhones nowadays do, but it seems only a third of Android phones do.


Ten years ago at BlackHat, we presented the "data seepage" problem, how the broadcasts from your devices allow you to be tracked. Among the things we highlighted was how WiFi probes looking to connect to access-points expose the unique hardware address burned into the phone, the MAC address. This hardware address is unique to your phone, shared by no other device in the world. Evildoers, such as the NSA or GRU, could install passive listening devices in airports and train-stations around the world in order to track your movements. This could be done with $25 devices sprinkled around a few thousand places -- within the budget of not only a police state, but also the average hacker.

In 2014, with the release of iOS 8, Apple addressed this problem by randomizing the MAC address. Every time you restart your phone, it picks a new, random, hardware address for connecting to WiFi. This causes a few problems: every time you restart Continue reading

Worth Reading: Malware in your screen

Phone touchscreens, and other similar hardware components such as orientation sensors, wireless charging controllers, and NFC readers, are often produced by thirdparty manufacturers and not by the phone vendors themselves. Third-party driver source code to support these components is integrated into the vendor’s source code. In contrast to “pluggable” drivers, such as USB or network drivers, the component driver’s source code implicitly assumes that the component hardware is authentic and trustworthy. As a result of this trust, very few integrity checks are performed on the communications between the component and the device’s main processor. —Shattered Trust (PDF)

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Hey Alexa, Turn my lab on!

TL/DR Put together a custom Alexa Skill so I can turn switches and routers off in my lab as shown in the video here. Feels pretty great.

 

As most of my twitter followers have noticed, I’ve been doing a lot of Home Automation, mostly with Apple #homeKit. But I also picked up an Amazon Dot because… well why not?

One of the great things abut the digital voice assistance from Amazon, is that they have created an extensible framework that enables those with a little bit of coding skills to add to Mrs. A’s already already impressive impressive array of abilities.

The Amazon Alexa developer page is pretty impressive. There’s a ton of information and tutorials there, as well as an SDK and code examples in Node.js. I’m almost exclusively a python coder at this point, so I decided to look for something a little more familiar and came upon this.

Flask-Ask

Flask-Ask is a Flask extension that makes building Alexa skills for the Amazon Echo easier and much more fun.

Essentially, John Wheeler took the flask WSGI ( web) framework and made it super easy to be able to create Amazon Alexa skills using this familiar library. Continue reading

Worth Reading: It’s okay to forget what you read

Many of us feel this near-existential fear that we might “lose” what wisdom we extract from the books we read.Such fears are unfounded. First of all, if you love books, memory is never a problem. If I read for pure pleasure, what harm is there is forgetting? I get to enjoy the same wonderful book over and over again — for the book-lover, what better gift is there than forgetfulness? But many of us read books for reasons other than pleasure. We want to get something from the books we read. There is much written on retaining what you read (note it, connect it, summarize it, teach it, yawn…), but Paul Graham, I think, has something new and interesting to say. —Charles Chu on Medium

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Upcoming Events and Webinars

You might have noticed the “upcoming webinars” blog widget is gone and I’ll write a blog post every two weeks or so to keep you updated on upcoming webinars and other events.

Here’s what’s coming in September and October 2017:

Istanbul/Turkey Onsite CCDE Training – 50% OFF until Sep-15, 2017

Istanbul/Turkey Onsite CCDE Training will be held between October 30 – November 4.   Course will be in English as usual, everyday will be between 9am – 6pm, 9 hours.   I am going to extend my CCDE Materials for this course as there was new scenarios and the technologies after August 29, 2017 CCDE […]

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Docker Networking Tip – Load balancing options in Docker

I had promised earlier that I will continue my Docker Networking Tip series. This is second in that series. The first one on Macvlan driver can be found here. In this presentation, I have covered different load balance options with Docker. Following topics are covered in this presentation: Overview of Service Discovery and Load balancing … Continue reading Docker Networking Tip – Load balancing options in Docker →

Change VM Hardware Version

The VM hardware version designates the virtual hardware functions supported by a virtual machine, which relates to the hardware on the host server. A VMware product will not be able to power on a VM with a hardware version higher than what it supports.

oVirt Now Supports OVS-DPDK

DPDK (Data Plane Development Kit) provides high-performance packet processing libraries and user space drivers. Open vSwitch uses DPDK libraries to perform entirely within the user space. According to Intel ONP performance tests, using OVS with DPDK can provide a huge performance enhancement, increasing network packet throughput and reducing latency.

OVS-DPDK has been added to the oVirt Master branch as an experimental feature. The following post describes the OVS-DPDK installation and configuration procedures.

Please note: Accessing the OVS-DPDK feature requires installing the oVirt Master version. In addition, OVS-DPDK cannot access any features located within the Linux kernel. This includes Linux bridge, tun/tap devices, iptables, etc.

Requirements

In order to achieve the best performance, please follow the instructions at: http://dpdk.org/doc/guides-16.11/linux_gsg/nic_perf_intel_platform.html

The network card must be on the supported vendor matrix, located here: http://dpdk.org/doc/nics

Ensure that your system supports 1GB hugepages: grep -q pdpe1gb /proc/cpuinfo && echo "1GB supported"

  • Hardware support: Make sure VT-d / AMD-Vi is enabled in BIOS
  • Kernel support: When adding a new host via the oVirt GUI, go to Hosts -> Edit > Kernel, and add the following parameters to the Kernel command line: iommu=pt intel_iommu=on default_hugepagesz=1GB hugepagesz=1G hugepages=N In the event that 1GB Continue reading
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