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Raspberry Pi random host generator |
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Présentation : Say you have a really watchful network systems administrator that keeps a close eye on new devices being joined to the network... You know where this is going. It's April 1st. Toss this into home pi, then make it executable. bin sh while true do mac echo -n 00 03 BA dd bs 1 count 3 if dev random 2 dev null hexdump -v -e ' 1 pourcents02X ' newhost dd if dev urandom bs 35 count 1 2 dev null tr -dc a-z echo mac newhost ifconfig eth0 down pkill dhclient hostname newhost ifconfig eth0 hw ether mac rm etc ssh ssh_host_rsa_key etc ssh ssh_host_dsa_key ssh-keygen -f etc ssh ssh_host_rsa_key -N '' -t rsa -P '' ssh-keygen -f etc ssh ssh_host_dsa_key -N '' -t dsa -P '' ifconfig eth0 up dhclient eth0 ip addr show eth0 grep inet echo Sleeping... sleep 60 done You can add the below line before exit 0 line at the end of etc rc.local on Raspbian to make it start up at boot. You have a random host generator that spawns a new MAC Address, random host name and new SSH keys every minute or so. nohup home pi mac.sh tmp mac.out A few notes This will totally hose all of your SSH host keys on the pi. Make backups of them if they're important to you. I chose an OUI 00 30 BA that I knew would not match anything else on the target network. You may wish to do some research and change the hard-coded OUI prefix in the code above. The interface fluxing will also make remote management troublesome unless you have a wireless adapter that's on a more stable network, but this can betray you, as the host keys keep changing to match the wired interfaces. I took the additional step of leaving the Pi powered on for a few minutes before attaching the ethernet cable, so that it wouldn't ever show up on the network with a Raspberry Pi MAC address, since it had time to generate a new fake address before I hooked it in. Also, thanks to the target of this April Fool's day prank for giving me a few extra ideas included here, but not in the original implementation after catching me in the act. We are proud members of the Security Bloggers Network. This content originally posted on HiR Information Report. Copyright 1997-2010, HiR
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- avec iptables "iptables -A INPUT -s 88.190.17.190 --dport 80 -j DROP"
- avec ipfw et wipfw "ipfw add deny from 88.190.17.190 to any 80"
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