Our My first DDoS attack. Velocity Europe 2011 Berlin Cosimo Streppone Operations Lead

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1 Our My first DDoS attack Velocity Europe 2011 Berlin Cosimo Streppone Operations Lead

2 <video of Mr. Wolf going to Jimmy's house in Pulp Fiction> this couldn't fit in the PDF... sorry.

3

4

5

6

7 my.opera.com/ao-trang-oi/blog/

8 nginx secret sauces? # Pavel's secret gzip tuning sauce gzip on; gzip_disable msie6; gzip_min_length 1100; gzip_buffers 16 8k; gzip_comp_level 3; gzip_types text/plain application/xml application/x-javascript text/css;

9 nginx secret sauces? # Michael's secret file cache sauce open_file_cache max=1000 inactive=20s; open_file_cache_valid 30s; open_file_cache_min_uses 2; open_file_cache_errors on;

10 nginx antidos.conf # More on https://calomel.org/nginx.html client_header_timeout 5; client_body_timeout 10; ignore_invalid_headers on; send_timeout 10; # To limit slowloris-like attacks client_header_buffer_size 4k; large_client_header_buffers 4 4k;

11 nginx drop client connections # Cut abusive established connections, # forcing clients to reconnect location ~ ^/Ao-Trang-Oi/blog/ { return 444; }

12 nginx varnish caching nginx varnish backends

13 iptraf

14 tcpdump of anomalous traffic GET /Ao-Trang-Oi/blog/show.dml/ HTTP/1.1 User-Agent: 1.{RND 10}.{RND 10} Referrer: Cache-Control: no-cache Cookie: utma= [ ] utmz= [ ] utmcsr=google utmccn= [ ] utmctr=cach%20de%20hoc%20mon [ ] <... random high speed junk follows...>

15 tcpdump of anomalous traffic GET /Ao-Trang-Oi/blog/?startidx=1295 HTTP/1.1 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-us;) Gecko/ Netscape/7.1 (ax) Accept: Accept=text/html,application/xhtml+xml,... Accept-Language: Accept-Language=en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: Accept-Charset=ISO ,... Referer: Pragma: no-cache Keep-Alive: 300 ua-cpu: x86 Connection: close

16 #nginx, 14th October 2010 cosimo: we're seeing a pretty "interesting" problem within our nginx fronts cosimo: there's a few hosts sending a legitimate HTTP GET request cosimo: followed by a binary stream of random bytes that never ends cosimo: this is just 1 request going on and on cosimo: is there some way to alter the nginx config to shut down these client connections? cosimo: the client is sending something like: cosimo: GET /blah HTTP/1.1 cosimo: Host:... cosimo: Etc: etc... cosimo: and then random bullshit vr: :) vr: this is nkiller2 vr: haproxy can fight this vr: you can set a timeout http-request vr: don't know if nginx can do this cosimo: cool BLAH BLAH BLAH BLAH BLAH BL BLAH BLAH BLAH OMGWTFBBQ!!!!11111 this is nkiller2

17 PHRACK#66

18 tcp window zero?

19 iptables -A -m u32 --u32 6&0xFF=0x6 && 4&0x1FFF=0 && 0>>22&0x3C () 12&0xFFFF=0x0000 -j ZERO_WINDOW_RECENT

20 u32 zero window filter 6 & 0xFF = 0x6

21 u32 zero window filter 4 & 0x1FFF = 0x0

22 u32 zero window filter 0>>22 & 0x3C () 12 & 0xFFFF = 0x0

23 u32 zero window filter 0>>22 & 0x3C () 12 & 0xFFFF = 0x0??

24

25

26 0>>22& [ PROTECTED] &0xFFFF=0x0000

27

28 u32 zero window filter 0>>22 & 12 & 0xFFFF = 0x0

29 iptables rules - logging $ipt -N ZERO_WINDOW_RECENT $ipt -A INPUT -m u32 --u32 "6&0xFF=0x6 && 4&0x1FFF=0 && -j ZERO_WINDOW_RECENT $ipt -A ZERO_WINDOW_RECENT -m recent --set --name ZERO_WINDOW $ipt -A ZERO_WINDOW_RECENT -m recent --update --seconds 60 --hitcount 20 --name ZERO_WINDOW -j LOG --log-level info --log-prefix "ZeroWindow"

30 ~18k distinct IPs

31 iptables rules - blocking $ipt -N ZERO_WINDOW_RECENT $ipt -A INPUT -m u32 --u32 "6&0xFF=0x6 && 4&0x1FFF=0 && -j ZERO_WINDOW_RECENT $ipt -A ZERO_WINDOW_RECENT -m recent set --name ZERO_WINDOW $ipt -A ZERO_WINDOW_RECENT -m recent update --seconds 60 --hitcount 20 --name ZERO_WINDOW -j DROP

32 shields-up.vcl cacheable content nginx varnish non-cacheable content backends

33 shields-up.vcl all HTTP content varnish nginx HTTPS-only traffic backends

34 nginx feels better

35 Pingdom response time 20s 10s 0s

36 End 29-Oct-2010

37 Packets/s seen by firewall Start 13-Oct-2010 End 29-Oct-2010

38

39

40 Questions?

41 What can we, as Ops, do better? Embrace failures and learn from them Be fast (no panic/blame, think Mr. Wolf) Coordinate (#ops, war rooms,...) Take notes Learn TCP/IP Know your tools (tcpdump, tcpflow, strace, nc, iptraf, )

42 my base_packages puppet module class base_packages { $packagelist = [ "ack-grep", "colordiff", "curl", "facter", "git-core", "htop", "iftop", "iptraf", "jed", "joe", "libwww-perl", "logrotate", "lsof", "make", "mc", "oprofile", "psmisc", "rsync", "screen", "svn", "sysstat", "tcpdump", "tcpflow", "telnet", "unzip", "vim", "zip" ] package { $packagelist: ensure => "installed", } }

43 Thanks to... ithilgore (sock-raw.org) for writing in #nginx for pointing us at nkiller2 David Falloon for his great untested idea marc.info for correctly in ml SANS Institute for the TCP/IP references My team at Opera

44 Danke!

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