c0d3 :: j0rg3

A collection of tips, tricks and snips. A proud Blosxom weblog. All code. No cruft.

Tue, 07 Mar 2017

Privacy Part II: VPN/IPVanish - Install IPVanish on Kali Linux

Okay, so you’re running Whonix, Tails or, at least, TorBrowser.

What’s next? You may wish to consider using a VPN. In simple terms, it’s somewhat similar to what Tor offers. That is: you connect to the VPN and your connection passes through them such that the site that you are visiting will see the VPN’s IP address rather than yours. Of course, that means that you can chain them.

That is: (You)->VPN->Tor->Exit node->Web site

The reason that you might feel compelled to take this step is that a party which is able to see your traffic into and out of Tor could still identify you. The thinking is that the parties who wish to interfere with your privacy could be compelled to run Tor bridges, relays and exit nodes. If traffic from your IP address could be matched to requests coming from the Tor exit node then you could, effectively, be identified.

Some people hold that using a VPN to access Tor does not improve your anonymousness. I am not among them. In particular, you will find that IPVanish offers VPN service for under $7 per month and is popular among users of the Tor network. Which means that in addition to the fact that IPVanish is not logging your traffic, there’s an excellent chance that other users are going from IPVanish into Tor, helping to reduce the uniqueness of your traffic.

By the way, I’d suggest poking around the web a little bit. While their prices are already great you can find some even deeper discounts: https://signup.ipvanish.com/?aff=vpnfan-promo

IPVanish’s site offers instructions for installing the VPN in Ubuntu so we’re going to take a look at using IPVanish in Kali — including an interesting and unanticipated snag (and, of course, how to fix it).

Let’s grab the OpenVPN configuration:
wget http://www.ipvanish.com/software/configs/ca.ipvanish.com.crt; wget http://www.ipvanish.com/software/configs/ipvanish-US-New-York-nyc-a01.ovpn

We will need the OpenVPN package for Gnome:
apt install network-manager-openvpn-gnome

Click on the tray in the upper right corner, then the wrench/screwdriver icon:

Select the ‘Network’ folder icon:

We’re choosing ‘Wired’ (even though we’re using wlan0 interface):

We’re setting up a VPN, of course:

Import from file:

Choose the configuration file that we downloaded previously:

Enter ‘User name’ and ‘Password’:

We are connected!

Verified at IPVanish’s site: https://www.ipvanish.com/checkIP.php

And this is where I had anticipated the installation instructions would end.

I just wanted to check a few more things. And I would love to tell you that it was simply my thoroughness and unbridled CLI-fu that led to discover that I was still making ipv6 connections outside of the VPN. Seems that it wasn’t noticed by the test at IPVanish because they deal only in ipv4. I was able to prove my ipv6 address and geolocation by using: http://whatismyipaddress.com/

Further, we can establish that the test at IPVanish is not ipv6-compatible with a quick test.

The easy fix here is to disable ipv6 locally. It is plausible that this could cause unintended consequences and, to be thorough, it would be best to handle your VPN at the firewall. Having support for OpenVPN, you’ll be able to get this running with a huge variety of routing/firewall solutions. You can grab any number of tiny computers and build a professional-quality firewall solution with something like pfSense. Maybe we’ll take a look at getting that configured in a future post.

But, for now, let’s shut down ipv6 in a way that doesn’t involve any grandiose hand-waving magic (i.e., unexplained commands which probably should work) and then test to get confidence in our results.

Let’s use sysctl to find our ipv6 kernel bits and turn them off. Then we’ll load our configuration changes. As a safety, it wouldn’t be a bad idea to look in /etc/sysctl.conf to verify that there aren’t any ipv6 configs in there.

We’ll back up our config file then turn off everything ipv6 by listing everything with the words ‘ipv6’ and ‘disable’:
cp /etc/sysctl.conf /etc/$(date +%Y-%m-%d.%H-%M-%S).sysctl.conf.bak && \
sysctl -a | grep -i ipv6 | grep disable | sed 's/0/1/g' >> /etc/sysctl.conf && \
sysctl -p

To explain what we’re doing:
List all kernel flags; show uonly those containing the string ‘ipv6’; of those that remain, show only those that contain the string ‘disable’:
sysctl -a | grep -i ipv6 | grep disable
Replace the 0 values with 1, to turn ON the disabling, by piping output to:
sed 's/0/1/g'
That all gets stuck on the end of ‘sysctl.conf’ by redirecting stdout to append to the end of that file:
>> /etc/sysctl.conf
Then we reload with:
sysctl -p

Then as a final sanity-check we’ll make sure we can’t find any ipv6 packets sneaking about:
tcpdump -t -n -i wlan0 -s 256 -vv ip6

At this point, assuming our tcpdump doesn’t show any traffic, we should be ipv6-free with all of our ipv4 traffic shipped-off nicely through IPVanish!


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Permalink: 20170307.privacy.vpn.ipvanish

Thu, 30 May 2013

Making ixquick your default search engine

In this writer’s opinion, it is vitally important that we take reasonable measures now to help insure anonymity, lest we create a situation where privacy no longer exists, and the simple want of, becomes suspicious.

Here’s how to configure your browser to automatically use a search engine that respects your privacy.

Chrome:

  1. Click Settings.
  2. Click “Set pages” in the “On startup” section.
  3. Enter https://ixquick.com/eng/ in the “Add a new page” text field.
  4. Click OK.
  5. Click “Manage search engines…”
  6. At the bottom of the “Search Engines” dialog, click in the “Add a new search engine” field.
  7. Enter
    ixquick
    ixquick.com
    https://ixquick.com/do/search?lui=english&language=english&cat=web&query=%s
  8. Click “Make Default”.
  9. Click “Done”.

Firefox:

  1. Click the Tools Menu.
  2. Click Options.
  3. Click the General tab.
  4. In “When Firefox Starts” dropdown, select “Show my home page”.
  5. Enter https://ixquick.com/eng/ in the “Home Page” text field.
  6. Click one of the English options here.
  7. Check box for “Start using it right away.”
  8. Click “Add”.

Opera:

  1. Click “Manage Search Engines
  2. Click “Add”
  3. Enter
    Name: ixquick
    Keyword: x
    Address: https://ixquick.com/do/search?lui=english&language=english&cat=web&query=%s
  4. Check “Use as default search engine”
  5. Click “OK”

Internet Explorer:

      _     ___  _ __        ___   _ _____ ___ 
     | |   / _ \| |\ \      / / | | |_   _|__ \
     | |  | | | | | \ \ /\ / /| | | | | |   / /
     | |__| |_| | |__\ V  V / | |_| | | |  |_| 
     |_____\___/|_____\_/\_/   \___/  |_|  (_) 
    
    
    (This is not a good strategy for privacy.)

Congratulations!

\o/

You are now one step closer to not having every motion on the Internet recorded.

This is a relatively small measure, though. You can improve your resistance to prying eyes (e.g., browser fingerprinting) by using the Torbrowser Bundle, or even better, Tails, and routing your web usage through Tor, i2p, or FreeNet.

If you would like more on subjects like anonymyzing, privacy and security then drop me a line via email or Bitmessage me: BM-2D9tDkYEJSTnEkGDKf7xYA5rUj2ihETxVR


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Permalink: 20130530.hey.you.get.offa.my.data

Thu, 23 May 2013

GNU Screen: Roll your own system monitor

Working on remote servers, some tools are practically ubiquitous — while others are harder to come by. Even if you’ve the authority to install your preferred tools on every server you visit, it’s not always something you want to do. If you’ve hopped on to a friend’s server just to troubleshoot a problem, there is little reason to install tools that your friend is not in the habit of using. Some servers, for security reasons, are very tightly locked down to include only a core set of tools, to complicate the job of any prying intruders. Or perhaps it is a machine that you normally use through a graphical interface but on this occasion you need to work from the CLI.

These are very compelling reasons to get comfortable, at the very least, with tools like Vim, mail, grep and sed. Eventually, you’re likely to encounter a situation where only the classic tools are available. If you aren’t competent with those tools, you’ll end up facing the obstacle of how to get files from the server to your local environment where you can work and, subsequently, how to get the files back when you’re done. In a secured environment, this may not be possible without violating protocols.

Let’s take a look at how we can build a makeshift system monitor using some common tools. This particular configuration is for a server running PHP, MySQL and has the tools Htop and mytop installed. These can easily be replaced with top and a small script to SHOW FULL PROCESSLIST, if needed. The point here is illustrative, to provide a template to be modified according to each specific environment.

(Note: I generally prefer tmux to Gnu Screen but screen is the tool more likely to be already installed, so we’ll use it for this example.)

We’re going to make a set of windows, by a configuration file, to help us keep tabs on what is happening in this system. In so doing, we’ll be using the well-known tools less and watch. More specifically, less +F which tells less to “scroll forward”. Other words, less will continue to read the file making sure any new lines are added to the display. You can exit this mode with CTRL+c, search the file (/), quit(q) or get back into scroll-forward mode with another uppercase F.

Using watch, we’ll include the “-d” flag which tells watch we want to highlight any changes (differences).

We will create a configuration file for screen by typing:

> vim monitor.screenrc

In the file, paste the following:

# Screen setup for system monitoring
# screen -c monitor.screenrc
hardstatus alwayslastline
hardstatus string '%{= kG}[ %{G}%H %{g}][%= %{=kw}%?%-Lw%?%{r}(%{W}%n*%f%t%?(%u)%?%{r})%{w}%?%+Lw%?%?%= %{g}][%{B}%Y-%m-%d %{W}%c %{g}]'

screen -t htop 0 htop
screen -t mem 1 watch -d "free -t -m"
screen -t mpstat 2 watch -d "mpstat -A"
screen -t iostat 3 watch -d "iostat"
screen -t w 4 watch -d "w"
screen -t messages 5 less +F /var/log/messages
screen -t warn 6 less +F /var/log/warn
screen -t database 7 less +F /srv/www/log/db_error
screen -t mytop 8 mytop
screen -t php 9 less +F /srv/www/log/php_error

(Note: -t sets the title, then the window number, followed by the command running in that window)

Save the file (:wq) or, if you’d prefer, you can grab a copy by right-clicking and saving this file.

Then we will execute screen using this configuration, as noted in the comment:

> screen -c monitor.screenrc

Then you can switch between windows using CTRL+a, n (next) or CTRL+a, p (previous).

I use this technique on my own computers, running in a TTY different from the one used by X. If the graphical interface should get flaky, I can simply switch to that TTY (e.g., CTRL+ALT+F5) to see what things are going on — and take corrective actions, if needed.


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Permalink: 20130523.gnu.screen.system.monitor

Tue, 07 May 2013

Welcome, traveler.

Thanks for visiting my little spot on the web. This is a Blosxom ‘blog which, for those who don’t know, is a CGI written in Perl using the file-system (rather than a database).

To the CLI-addicted, this is an awesome little product. Accepting, of course, that you’re going to get under the hood if you’re going to make it the product you want. After some modules and hacking, I’m pleased with the result.

My posts are just text files, meaning I start a new one like: vim ~posts/`date +%Y%m%d`.brief.subject.txt

Note: the back-ticks (`) tell the system that you want to execute the command between ticks, and dynamically insert its output into the command. In this case, the command date with these parameters:
  1. (+) we’re going to specify a format
  2. (%Y) four-digit year
  3. (%m) two-digit month
  4. (%d) two-digit day
That means the command above will use Vim to edit a text file named ‘20130507.brief.subject.txt’ in the directory I have assigned to the hash of ‘posts’. (using hash this way is a function of Zsh that I’ll cover in another post)

In my CLI-oriented ‘blog, I can sprinkle in my own HTML or use common notation like wrapping a word in underscores to have it underlined, forward-slashes for italics and asterisks for bold.

Toss in a line that identifies tags and, since Perl is the beast of Regex, we pick up the tags and make them links, meta-tags, etc.

Things here are likely to change a lot at first, while I twiddle with CSS and hack away at making a Blosxom that perfectly fits my tastes — so don’t be too alarmed if you visit and things look a tad wonky. It just means that I’m tinkering.

Once the saw-horses have been tucked away, I’m going to take the various notes I’ve made during my years in IT and write them out, in a very simple breakdown, aimed at sharing these with people who know little about how to negotiate the command line. The assumption here is that you have an interest in *nix/BSD. If you’ve that and the CLI is not a major part of your computing experience, it probably will be at some point. If you’re working on systems remotely, graphical interfaces often just impede you.

Once you’ve started working on remote machines, the rest is inevitable. You can either remember how to do everything two ways, through a graphical interface and CLI — or just start using the CLI for everything.

So let’s take a little journey through the kinds of things that make me love the CLI.


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Permalink: 20130507.greetings