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  #1 (permalink)  
Old 09-24-2010, 05:59 PM
Y Knot
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Default Linux software to randomize PC hostname & wireless MAC for privacyat hotspots

If I understand Jeff L. correctly, hotspots often log your hostname and
wirelss car MAC address; so I wish to automatically change my wireless
card MAC and laptop PC hostname upon every reboot.

On Windows, I can change these things manually but there are plenty of
freeware packages which pseudo-randomize the hostname (based on a lookup
table) and wireless MAC address for added privacy at hotspots upon every
reboot. These work great!

However, on Linux, while I can change these things manually, I have not
yet found software that does so automatically upon every reboot.

Here's how I change the hostname on Linux manually:
$ sudo vi /etc/hosts

Change the contents of /etc/hosts from:
127.0.1.1 ubuntu ubuntu

Change the contents of /etc/hosts to:
# 127.0.1.1 ubuntu ubuntu
127.0.0.1 foo foo

$ sudo echo foo > /etc/hostname
$ sudo reboot

And, here's how I change the MAC address on Linux manually:
$ ifconfig -a | grep HWaddr
$ sudo ifconfig wlan0 down hw ether DE:AD:BE:EF:CA:FE
$ sudo ifconfig wlan0 up

The question is where can I find software that will perform that task of
changing the wireless card MAC address and PC hostname upon every reboot?

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  #2 (permalink)  
Old 09-24-2010, 06:44 PM
Nomen Nescio
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Default Re: Linux software to randomize PC hostname & wireless MAC for privacy at hotspots

> If I understand Jeff L. correctly, hotspots often log your hostname and
> wirelss car MAC address; so I wish to automatically change my wireless
> card MAC and laptop PC hostname upon every reboot.


> On Windows, I can change these things manually but there are plenty of
> freeware packages which pseudo-randomize the hostname (based on a lookup
> table) and wireless MAC address for added privacy at hotspots upon every
> reboot. These work great!


> However, on Linux, while I can change these things manually, I have not
> yet found software that does so automatically upon every reboot.


> Here's how I change the hostname on Linux manually:
> $ sudo vi /etc/hosts


> Change the contents of /etc/hosts from:
> 127.0.1.1 ubuntu ubuntu


> Change the contents of /etc/hosts to:
> # 127.0.1.1 ubuntu ubuntu
> 127.0.0.1 foo foo


> $ sudo echo foo > /etc/hostname
> $ sudo reboot


> And, here's how I change the MAC address on Linux manually:
> $ ifconfig -a | grep HWaddr
> $ sudo ifconfig wlan0 down hw ether DE:AD:BE:EF:CA:FE
> $ sudo ifconfig wlan0 up


> The question is where can I find software that will perform that task of
> changing the wireless card MAC address and PC hostname upon every reboot?


I know nothing about Linux, but can't you put your code into a
bat file and execute upon every boot?














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  #3 (permalink)  
Old 09-24-2010, 07:22 PM
Bit Twister
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Default Re: Linux software to randomize PC hostname & wireless MAC forprivacy at hotspots

On Fri, 24 Sep 2010 16:59:30 +0000 (UTC), Y Knot wrote:
>
> However, on Linux, while I can change these things manually, I have not
> yet found software that does so automatically upon every reboot.
>


For about 99.99% of the time, whatever you can do manually, you can
put the commands in a script to do the same thing.


> The question is where can I find software that will perform that task of
> changing the wireless card MAC address and PC hostname upon every reboot?


If you look in /etc/init.d you will see several scripts which execute
during system startup/shutdown.

If you look in /etc you will see several directories which contain
links back to /etc/init.d scripts. Do a
ls /etc/rc?.d

Now look in a directory, with
ls -l /etc/rc2.d/*
Those S* links are the order they
execute during Startup and the K* are the links executed in that order
during kill/shutdown.

If you were to do the command
runlevel
you would see what level you are running and can look in that
directory to see what executes when.

If you do a
$ runlevel
N 2
the your runlevel is 2. So, do a
ls -l /etc/rc2.d/*

I your case you might try creating a /etc/init.d/rnd_hostname
then create a /etc/rc2.d/S05rnd_hostname link pointing to
/etc/init.d/rnd_hostname.

Next boot, S05rnd_hostname would run your script to change host name.

Going to guess you are running ubuntu. It runs dhclient which gets
your ip address and whatnot to connect to the internet.

Doing a man dhclient eventually suggests doing a
man dhclient_script
which can lead to the fact that you can create a
/etc/dhcp3/dhclient-exit-hooks script. That is where I would try to
put code to munge your MAC address.

You might want to bookmark this url
http://tldp.org/LDP/abs/html/index.html

You could create /etc/dhcp3/dhclient-exit-hooks with
echo $@ > /tmp/hooks
env >> /tmp/hooks

Set execute permission with
chmod +x /etc/dhcp3/dhclient-exit-hooks

After booting, look at /tmp/hooks to see what information is available
for your code.

Now, delete /tmp/hooks and restart the network and see what you have.

rm /tmp/hooks
service network-manager restart
cat /tmp/hooks

All the above needs to done from a root terminal. To get to a root terminal:

sudo -i

when through with root terminal, enter the command exit or do a control d

--
The warranty and liability expired as you read this message.
If the above breaks your system, it's yours and you keep both pieces.
Practice safe computing. Backup the file before you change it.
Do a, man command_here or cat command_here, before using it.

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  #4 (permalink)  
Old 09-25-2010, 02:29 AM
Y Knot
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Default Re: Linux software to randomize PC hostname & wireless MAC forprivacy at hotspots

On Fri, 24 Sep 2010 19:44:15 +0200, Nomen Nescio wrote:
> I know nothing about Linux, but can't you put your code into a
> bat file and execute upon every boot?


Probably.

The goal is to put it in the 'startup' directory (/etc/init.d/) somehow.

I did find a good way to 'randomize' the MAC address manually:
`echo $RANDOM$RANDOM | md5sum | sed -r 's/(..)/\1:/g; s/^(.{17}).*$/\1/;'`

And, I did find a way to 'randomize' the hostname based on a random
selection out of the standard Linux dictionary of words at /usr/share/
dict/words

The question now is how to tie all that together so that the random wlan0
mac and the random hostname are assigned upon reboot of the Ubuntu 10.04
laptop.





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  #5 (permalink)  
Old 09-25-2010, 03:07 AM
Bit Twister
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Default Re: Linux software to randomize PC hostname & wireless MAC forprivacy at hotspots

On Sat, 25 Sep 2010 01:29:17 +0000 (UTC), Y Knot wrote:

> The goal is to put it in the 'startup' directory (/etc/init.d/) somehow.
>
> The question now is how to tie all that together so that the random wlan0
> mac and the random hostname are assigned upon reboot of the Ubuntu 10.04
> laptop.


As an FYI: I took a quick peek through Ubuntu's init.d/ scripts.
I will suggest you change hostname on shutdown since I did not see
when hostname set during boot/start.

Put you code in rnd_hostname script I suggested and create a
Kxxrnd_hostname link in /etc/rcx.d

Suggest taking one of the scripts in init.d, copy to rnd_hostname and
start playing around.

Better yet, install virtualbox, create a guest virtual machine, take a
snapshot and start playing around. That way if you screw it up, you
can delete current snapshot, create a new on, and try again.

Changing hostname on the fly can cause you to lose gui desktop manager.

You might want to http://groups.google.com/groups/search to check out
init scripts.

http://groups.google.com/groups/sear...hors=&safe=off

alt.computer.security would be off topic now that you have a direction.

comp.unix.shell for scripting questions.
alt.os.linux.ubuntu for specific ubuntu questions.
ubuntu has a forum where you might get some help.

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  #6 (permalink)  
Old 09-25-2010, 09:38 AM
alexd
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Default Re: Linux software to randomize PC hostname & wireless MAC for privacy at hotspots

Meanwhile, at the alt.internet.wireless Job Justification Hearings, Bit
Twister chose the tried and tested strategy of:

> As an FYI: I took a quick peek through Ubuntu's init.d/ scripts.
> I will suggest you change hostname on shutdown since I did not see
> when hostname set during boot/start.


I've got /etc/init.d/hostname on my 10.04 laptop, although it's an Upstart
skeleton script so I can't actually see what it does.

--
<http://ale.cx/> (AIM:troffasky) (UnSoEsNpEaTm@ale.cx)
09:32:51 up 1 day, 15:52, 3 users, load average: 0.00, 0.02, 0.04
Qua illic est accuso, illic est a vindicatum


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  #7 (permalink)  
Old 09-25-2010, 09:41 AM
alexd
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Posts: n/a
Default Re: Linux software to randomize PC hostname & wireless MAC for privacy at hotspots

Meanwhile, at the alt.internet.wireless Job Justification Hearings, Y Knot
chose the tried and tested strategy of:

> And, I did find a way to 'randomize' the hostname based on a random
> selection out of the standard Linux dictionary of words at /usr/share/
> dict/words


Wouldn't it be funny if you got busted because your laptop had assigned
itself a hostname of 'pederast' [or similar].

--
<http://ale.cx/> (AIM:troffasky) (UnSoEsNpEaTm@ale.cx)
09:39:31 up 1 day, 15:59, 3 users, load average: 0.04, 0.01, 0.01
Qua illic est accuso, illic est a vindicatum


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  #8 (permalink)  
Old 09-25-2010, 03:03 PM
Shadow
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Default Re: Linux software to randomize PC hostname & wireless MAC for privacy at hotspots

On Fri, 24 Sep 2010 16:59:30 +0000 (UTC), Y Knot <yknot@unut.com>
wrote:
>However, on Linux, while I can change these things manually, I have not
>yet found software that does so automatically upon every reboot.

http://www.alobbs.com/macchanger/
Been around for ages. Packages available for ubuntu, debian,
etc etc
Put it in rc.local. But why on boot ?
Just link to a script. Don't forget the gksu, or whatever, you
need to be root.
[]'s

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  #9 (permalink)  
Old 09-27-2010, 06:40 AM
Y Knot
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Default Re: Linux software to randomize PC hostname & wireless MAC forprivacy at hotspots

On Sat, 25 Sep 2010 11:03:42 -0300, Shadow wrote:

> http://www.alobbs.com/macchanger/
> Been around for ages.
> But why on boot


I already tested MacChanger which didn't add ANY value whatsoever.
It's EXACTLY the same number of steps with MacChanger than without
MacChanger (so what's the point of the program anyway?).

With MacChanger, the steps are:
1. sudo macchanger -s wlan0
2. sudo /etc/init.d/networking stop
3. sudo macchanger --another wlan0
4. sudo /etc/init.d/networking start

Without MacChanger, the steps are:
1. sudo /etc/init.d/networking stop
2. sudo ifconfig wlan0 down hw ether DE:AD:BE:EF:CA:FE
3. sudo ifconfig wlan0 up
4. sudo /etc/init.d/networking start

The hostname can ONLY be changed (AFAIK) upon reboot anyway, so you may
as well do the MAC at the same time.

This is such a basic need that I'm sure a LOT of people have done it
already. The trick is to find them! :)

I'm working on adapting this script:
http://cryptoanarchy.org/wiki/Random_hostname_on_boot


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  #10 (permalink)  
Old 09-27-2010, 04:37 PM
Shadow
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Posts: n/a
Default Re: Linux software to randomize PC hostname & wireless MAC for privacy at hotspots

On Mon, 27 Sep 2010 05:40:07 +0000 (UTC), Y Knot <yknot@unut.com>
wrote:

>On Sat, 25 Sep 2010 11:03:42 -0300, Shadow wrote:
>
>> http://www.alobbs.com/macchanger/
>> Been around for ages.
>> But why on boot

>
>I already tested MacChanger which didn't add ANY value whatsoever.
>It's EXACTLY the same number of steps with MacChanger than without
>MacChanger (so what's the point of the program anyway?).
>
>With MacChanger, the steps are:
>1. sudo macchanger -s wlan0
>2. sudo /etc/init.d/networking stop
>3. sudo macchanger --another wlan0
>4. sudo /etc/init.d/networking start

is line one necessary ?
/sbin/ifconfig wlan0 down
/sbin/(or wherever)/macchanger -A wlan0
/sbin/ifconfig wlan0 up
>
>Without MacChanger, the steps are:
>1. sudo /etc/init.d/networking stop
>2. sudo ifconfig wlan0 down hw ether DE:AD:BE:EF:CA:FE

And that gives you a random MAC ?
DeadBeefCafe ? HELP!!! ALERT!! A HACKER!!!!
macchanger -A gives you a random MAC from a KNOWN
manufacturer.
and macchanger can be easily scripted.
This second example does not give you a random MAC.
>3. sudo ifconfig wlan0 up
>4. sudo /etc/init.d/networking start
>
>The hostname can ONLY be changed (AFAIK) upon reboot anyway, so you may
>as well do the MAC at the same time.
>
>This is such a basic need that I'm sure a LOT of people have done it
>already. The trick is to find them! :)
>
>I'm working on adapting this script:
>http://cryptoanarchy.org/wiki/Random_hostname_on_boot


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  #11 (permalink)  
Old 09-27-2010, 09:26 PM
Jeff Liebermann
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Posts: n/a
Default Re: Linux software to randomize PC hostname & wireless MAC for privacy at hotspots

On Fri, 24 Sep 2010 16:59:30 +0000 (UTC), Y Knot <yknot@unut.com>
wrote:

>If I understand Jeff L. correctly,


Nobody understands me correctly. I don't even understand myself
sometimes.

>hotspots often log your hostname and
>wirelss car MAC address; so I wish to automatically change my wireless
>card MAC and laptop PC hostname upon every reboot.


That might not help as your black hat, mask, and cape, with the skull
and crossbones are rather obvious. Shave your head and get some
tattoos, and you'll fit right in. To complete the disguise, I suggest
you camouflage your laptop as a pizza:
<http://www.humanbeans.net/powerpizza/>

Before you inflict your MAC address manufacturing machine on the
world, you may find it amusing to see how many times you can change
your MAC address connecting your wireless router before it fails.
Download and run:
<http://www.smallnetbuilder.com/mydownloads/max_session_tool.zip>
This tool generates new MAC addresses (and therefore new wireless
connections) until the router can't open any more. The doc is in the
ZIP file.
<http://www.smallnetbuilder.com/lanwan/lanwan-howto/31103-how-we-test-hardware-routers-revision-3>
You may need to set the netmask to /16 (255.255.0.0) in order to get a
decent number on high end wireless routers.

Most cheap /24 wireless routers will choke at 253 IP addresses if
they're not smart enough to discard unused DHCP leases or have limited
RAM. Better routers, that are smart enough to dump unsused leases,
will usually go to maybe 2046 before the MAC address to port number
table fills. Some will go to about 16000 connections.

If your script just changes the MAC address when you boot, there will
be no problem. If you script goes insane and spews random MAC
addresses without end, you're likely to hang the router.

As an added misfeature, some routers (i.e. DD-WRT) save the DHCP
leases in NVRAM. Reboot the router and it's still messed up because
the leases won't flush until they expire, which can take days.
(There's a check box in DD-WRT to disable this feature).


--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

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  #12 (permalink)  
Old 10-01-2010, 08:36 PM
Chris Davies
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Default Re: Linux software to randomize PC hostname & wireless MAC for privacy at hotspots

Bit Twister <BitTwister@mouse-potato.com> wrote:
> which can lead to the fact that you can create a
> /etc/dhcp3/dhclient-exit-hooks script. That is where I would try to
> put code to munge your MAC address.


No - this is too late: by then you've posted your MAC and received a
DHCP response. If you're going to tweak your MAC it should be done no
later than by a file in /etc/network/if-pre-up.d/ or a pre-up stanza
in /etc/network/interfaces.

Re setting the hostname, on my (Debian) box it's handled as part
of /etc/init.d/hostname.sh, which is called on system bootup as
/etc/rcS.d/S02hostname.sh. Obviously this may be different for Ubuntu
(I found the relevant script by running this command: grep -l hostname
/etc/init.d/* )

Chris

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  #13 (permalink)  
Old 10-01-2010, 08:37 PM
Chris Davies
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Posts: n/a
Default Re: Linux software to randomize PC hostname & wireless MAC for privacy at hotspots

Y Knot <yknot@unut.com> wrote:
> The hostname can ONLY be changed (AFAIK) upon reboot anyway [...]


Why on earth should this be the case?
Chris

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  #14 (permalink)  
Old 10-01-2010, 09:40 PM
Bit Twister
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Posts: n/a
Default Re: Linux software to randomize PC hostname & wireless MAC forprivacy at hotspots

On Fri, 01 Oct 2010 20:36:41 +0100, Chris Davies wrote:
> Bit Twister <BitTwister@mouse-potato.com> wrote:
>> which can lead to the fact that you can create a
>> /etc/dhcp3/dhclient-exit-hooks script. That is where I would try to
>> put code to munge your MAC address.

>
> No - this is too late: by then you've posted your MAC and received a
> DHCP response. If you're going to tweak your MAC it should be done no
> later than by a file in /etc/network/if-pre-up.d/ or a pre-up stanza
> in /etc/network/interfaces.
>
> Re setting the hostname, on my (Debian) box it's handled as part
> of /etc/init.d/hostname.sh, which is called on system bootup as
> /etc/rcS.d/S02hostname.sh. Obviously this may be different for Ubuntu
> (I found the relevant script by running this command: grep -l hostname
> /etc/init.d/* )


Yep, ubuntu hostname was not called in /etc/rcS.d/ or /etc/rc2.d/

I hear where you are coming from about dhclient-exit-hooks but you
have to decide if you want mac/hostname changed on startup, shutdown,
or each network restart.

I suggest setting them during shutdown. Major reason would be so next
boot would be pretty clean. You do not want to change host name after
some service/daemon has started with old name. Examples; postfix,
sendmail, leafnode, dovecot,..

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  #15 (permalink)  
Old 10-01-2010, 09:44 PM
Bit Twister
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Posts: n/a
Default Re: Linux software to randomize PC hostname & wireless MAC forprivacy at hotspots

On Mon, 27 Sep 2010 05:40:07 +0000 (UTC), Y Knot wrote:

> The hostname can ONLY be changed (AFAIK) upon reboot anyway, so you may


No, you can change it anytime you like, BUT you may lose your gui
desktop access because of name change and you would need to restart
any service/daemons which use the node name.
Examples: mysqld, postfix, sendmail, leafnode, dovecot,..

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