Centroid.EU Blog
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November 8th, 2014
One more week. I did some finishing touches today and then next week the
BETA_9 release will be done. Be sure to download your copy if you've been
using Wildcarddnsd, then. Also this may be the last release with the
Wildcarddnsd name, I've been thinking of renaming it to avoid confusions that
happen to pop up once in a while. The wildcarddnsd home page is at
wildcarddns.centroid.eu.
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Graphing DNS queries
November 5th, 2014
DNS doesn't take much traffic when the TTL is high enough. (like mine).
I have graphed a few weeks worth of wildcarddnsd data, spikes are probably
when I wrote to a mailing list.
I was graphing most of yesterday and decided to do the above today as well.
RRDTOOL++!
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Careful of a FritzBox downgrade!
November 2nd, 2014
I downgraded my Fritzbox from 6.20 to 6.04, and it turns out the saved config
is not backwards compatible. So after a lot of trying and not finding the
DSL access codes I had to take it back to 6.20 and restore the config. It's a
good thing that was possible. I then utilized my UDPTUNNEL program this
morning and it's working like a charm. I guess the FB analyses TCP and does
bad things with it.
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Upgraded Uranus(computer) to OpenBSD 5.6
October 30th, 2014
With patches (errata) applied, it looks like this:
# sysctl kern.version
kern.version=OpenBSD 5.6 (URANUS.MP) #0: Thu Oct 30 09:57:34 CET 2014
pjp@uranus.centroid.eu:/usr/src/sys/arch/i386/compile/URANUS.MP
I'll do the rest on saturday when packages are available.
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Proud owner of 5.6 CD's
October 29th, 2014
I have made prepwork to make mercury 5.6 tomorrow and I'll do the rest of the
network here on saturday I guess. Yes OpenBSD!
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When TCP is blocked/manipulated...
October 26th, 2014
then we tunnel! In the following
article
I showed proof that the DTAG network is screwed up. The problem persists,
and I have done a new thing to circumvent this screwing up. I have started
to tunnel.
$ ifconfig gif0
gif0: flags=8051 mtu 1280
priority: 0
groups: gif
tunnel: inet 149.210.171.149 -> 84.170.171.225
inet6 fe80::ca5:8ff4:dd1c:99fb%gif0 -> prefixlen 64 scopeid 0x6
inet 10.0.0.2 --> 10.0.0.1 netmask 0xff000000
right now everything works as it should and I have none of the retransmission
and delays I was talking about earlier. This is further proof that DTAG is
using some sort of Deep Packet Inspection that causes these screwups.
# ping 10.0.0.2
PING 10.0.0.2 (10.0.0.2): 56 data bytes
64 bytes from 10.0.0.2: icmp_seq=0 ttl=255 time=58.851 ms
64 bytes from 10.0.0.2: icmp_seq=1 ttl=255 time=62.127 ms
64 bytes from 10.0.0.2: icmp_seq=2 ttl=255 time=64.028 ms
--- 10.0.0.2 ping statistics ---
3 packets transmitted, 3 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 58.851/61.668/64.028/2.157 ms
Nuff said.
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Mytd, my tcp traceroute daemon
October 22nd, 2014
Yesterday I programmed this daemon based on last months tcp traceroute server.
It's actually pretty cool, it sandboxes a lot of processes and uses
descriptor passing when a function needs root credentials, the socket in
question is always passed back to the non-privileged process. Here is a
traceroute in process this is how it looks:
$ ps auxwww|grep mytd
root 13350 0.0 0.1 412 644 ?? Ss 9:52AM 0:00.00 mytd: master (mytd)
nobody 18672 0.0 0.1 476 808 ?? S 9:52AM 0:00.00 mytd: icmp listener (mytd)
root 29102 0.0 0.1 444 680 ?? S 10:59AM 0:00.00 mytd: ttl setter (mytd)
nobody 14652 0.0 0.1 624 924 ?? S 10:59AM 0:00.00 mytd: connection from 188.174.195.165 (mytd)
It's a looking glass traceroute, the traceroute looks a little like this:
mercury$ telnet supercluster.virgostar.net 1111
Trying 2a01:7c8:aaac:365::1...
telnet: connect to address 2a01:7c8:aaac:365::1: No route to host
Trying 149.210.171.149...
Connected to supercluster.virgostar.net.
Escape character is '^]'.
now sending you the traceroute, please wait...
now sending you the traceroute, please wait...
1 149.210.171.1
2 87.253.141.241
3 80.249.208.212
4 82.197.128.21
5 217.71.96.118
6 217.71.96.6
7 217.71.97.150
8 188.174.195.165
9 188.174.195.165
10 188.174.195.165
done.
Connection closed by foreign host.
I'm making the source code of this available
here. Enjoy.
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I have a new VPS!
October 19th, 2014
I'm very excited to give you the news. This one is called
supercluster.virgostar.net and I got it from transip.eu. The
VPS was almost immediately available but I had to install the OS on
a HTML5 console (wicked!). It costs me about 10 euros a month.
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Wiping Keys / Secrets (so important)
October 18th, 2014
I examined some software the other day that encrypts passwords. This
particular software doesn't wipe it's master key after use on the stack, so I
was able to write a proof-of-concept on my raspberry pi, that reads the
key from the stack when the database is accessed. Not knowing which is the
key though one must run through all offsets in the dumpfile in order to crack
the database, but that shouldn't be expensive in processor time.
The authors of Cryptography Engineering, write about this too in section 21.10,
that wiping keys after they are done with should be wiped "as soon as
a secret is no longer needed".
Some security concious programs even store sensitive keys privsep'ed process
and wipe as much as possible.
So lessons learned are:
- don't share your UNIX account with anyone else
- wipe keys when finished with them
- privsep keys when possible
Who would I like to thank? Everyone that helped me get to this conclusion.
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