User:Laurier Rochon/prototyping/varlogmessages

Nov 16 2011

Some discoveries from today

note to self : everything that I add in the /tmp folder of openWrt is WIPED OUT upon reboot.
1MB of raw packets scraped from tcpdump > ~300-400k after being read back into tcpdump (-r) > ~50-60K gzipped = PROFIT!
lsof is 1.5megs - fuser is 5K, but relies on Perl , which is 15Megs...pft. All this just to check on open files?

SSH into your router /w rsa keys

ssh-keygen -t dsa
scp ~/.ssh/id_dsa.pub root@192.168.1.1:/tmp
cd /etc/dropbear
cat /tmp/id_*.pub >> authorized_keys
chmod 0600 authorized_keys
ssh root@192.168.1.1

SSH <FROM> your router <INTO> another machine

dropbearkey -y -f /etc/dropbear_rsa_host_key | grep ssh-rsa > /tmp/dropbear_rsa_host_key.pub #this dropbear thingy is the magic part
#you might have to / or not add "root@$router_hostname" at the end of that file if it's missing
scp root@192.168.1.10:/tmp/dropbear_rsa_host_key.pub ~/.ssh/ #will ask for PW
cat /tmp/dropbear_rsa_host_key.pub >> ~/.ssh/authorized_keys

and then you can ssh/scp back into your computer, another remote computer, another router, etc.

Nov 15 2011

Some wget schtuff

wget -o /dev/null --post-data "var1=DFKSDFLSJFSLKJFS" http://www.YOURURL.com/file.php

Posting data to a webpage using wget! basically the --post-data is what makes it possible, and -o just suppresses output. fancy!

Nov 13 2011

The magic command to make the -C option work in TCPDUMP

tcpdump -w capturefile -C 1 -tt -v -s 0 -W 3

-C is millions of bytes, so 1 is a single MB
-W is rotate 3 files and start overwriting the #1 file if you've reached the limit. This maxes out to 3MB of packets, and avoid memory problems. I will probably make this even less in time.

Nov 12 2011

Some stuff that I can see when you connect to my open network, and you're not SSLed

I can infer :

your ip address
website urls/addresses your are checking out
your cookies
the time/date of your connection
type of requests
a bunch of stuff about the sites/ips you are accessing (server type, charset, encoding, expiry of cached items, etc.)
your type of computer
your browser

Cache-Control: private
Content-Type: text/html; charset=utf-8
Content-Encoding: gzip
Vary: Accept-Encoding
Server: Microsoft-IIS/7.5
X-AspNet-Version: 4.0.30319
Set-Cookie: expEAPID=00000; expires=Sun, 13-Nov-2011 22:09:18 GMT; path=/
Set-Cookie: hl_upm=Nn2Ysa9T4Cqie71CJ0BJAQ2dl+sJdqq8EU242ghkODRO2IkiNYVxHYyIPWFN+6wqfsvxGC/9jrVBX928g/PtId9XJDSkLwiJ8Im2YjeI24XXxWtfKkjWFgc9Yav3yYuRNoqggHdVGBEPuF+rxbrMexjiU69envcu8Y4nl+6v5FEzXgGFpF65EFS/ZnGMS1CNrpkag4pXQ9xn1GUlebDS4KsI0fGUrmWdYsYZ5D3ixtq7u4oGj8HkEESArT6rNLxIlchMPUpGe/n5ot3uLg18u8mK2hafL/Hbejp8nexXmlUAx7wNHQE9jWviiPWQt0DV; expires=Tue, 11-Nov-2014 22:09:18 GMT; path=/
X-Powered-By: ASP.NET
p3p: CP="ALL DSP COR CUR ADMo DEVo PSAo PSDo IVDi OUR STP PRE"
Date: Sat, 12 Nov 2011 22:09:17 GMT
Connection: close
Content-Length: 171


Host: extras.expedia.com
Connection: keep-alive
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/14.0.835.202 Safari/535.1
Accept: 
03:33:55.707141 IP (tos 0x0, ttl 64, id 34647, offset 0, flags [DF], proto TCP (6), length 821)
    192.168.1.80.49813 > 209.235.221.100.www: Flags [P.], cksum 0xdebd (correct), seq 1369:2138, ack 1, win 14600, options [nop,nop,TS val 396284 ecr 820465701], length 769
E..5.W@.@.?#...P...d...Pq....._:..9........
....0.P%*/*
Referer: http://www.expedia.ca/Flights-Search?c=81da3b4b-fa6c-4ad6-90c0-85eb0680061b&
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Cookie: s_vi=[CS]v1|275F76E685010720-600001156055591E[CE]; UID=2022018174|0|0; U9Z5=3Lu9nSNzg7HLr4Cf1D4DszGoQyp2VhN7B4X8zISY4mPMYbGAwx7Gb_A; expEAPID=0000; hl_upm=Nn2Ysa9T4Cqie71CJ0BJAQ2dl+sJdqq8EU242ghkODRO2IkiNYVxHYyIPWFN+6wqfsvxGC/9jrVBX928g/PtIWvbHBSJ0UHbBfQl1hvELszPXpQ7noYDsJlI6gfxmbpusNW6RXkpfOCE3FBP4yjN62ERPvDbEVdHRh3iWHvlZKe+OU7GblMzSkAU+y8E3tfu7eURIbBUa+yuVFpFA0vc2GKF8puH2Ntqvw5a9TwZ1WOLHA69KGZt/oXjFXK4qxOnDBFzUxMcc7+os6N4QJqZXOoPc4oihgL+bu2lvS9risbpRlyAWCnqTH0D/gLppMVL; hl_ubm=uKjVtH2uMJkYHxNp2xd/i9ghFhQsIBk98RpJ41rmDQtykvzGxwuI5WjQGN4RgkyM


..'GET /hphotos-ak-snc7/295091_10150336609875660_507750659_10156333_1388848_s.jpg HTTP/1.1
Host: photos-e.ak.fbcdn.net
Connection: keep-alive
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/14.0.835.202 Safari/535.1
Accept: */*
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3

Managed to revive a bricked router recently
Managed to brick another router I had working fine yesterday...meh.

openWrt shows me many nice things...

Just like your average linux box...but you have about 1000K free to operate things (on a classic WRT54GL anyways). Choose your packages wisely!

And it also sports a nice GUI, so I can monitor you in pink colors

The end for now

Nov 11 2011

Hardware harvesting

New router /w USB connector on its way...

Got my hands on TWO WRT54G's to do some flashing, testing and whatnot. I can actually try to create an AP with one and then attempt to connect using the other...hmm. Also got a 50m ethernet cable to get things going.

And then one of these two devices would be talking to my Arduino hypothetically through my Ethernet Shield mounted onto the arduino