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Differences between version 2 and previous revision of CyberLeo/Scraps/cocknocker.

Other diffs: Previous Major Revision, Previous Author

Newer page: version 2 Last edited on Tuesday, 29 May 2012 7:10:38 by CyberLeo Revert
Older page: version 1 Last edited on Tuesday, 29 May 2012 7:05:47 by CyberLeo Revert
@@ -2,9 +2,9 @@
 require 'openssl' 
 require 'socket' 
 require 'zlib' 
  
-bad _ports = [ 0, 25, 135, 139, 445 ] 
+BAD _PORTS = [ 0, 25, 135, 139, 445 ] 
  
 def packet(generation, ip, time) 
  a = [ generation ] 
  a.concat(ip.split('.').map(&:to_i)) 
@@ -39,20 +39,24 @@
 def check(packet, bad_ports) 
  bad_ports - packet == bad_ports 
 end 
  
-key = OpenSSL::PKey::RSA.new (192 )  
-ip = '127.0.0.1'  
- time = Time.now.to_i 
+def knock (ip, key )  
+ time = Time.now.to_i  
+ generation = 0  
+ packet = nil  
+ until packet && check(packet, BAD_PORTS)  
+ packet = fmt(encrypt(packet(generation, ip, time), key))  
+ generation += 1  
+ end  
  
-packet = nil  
-generation = 0  
-until packet && check(packet, bad_ports)  
- packet = fmt (encrypt(packet(generation , ip, time), key) )  
- generation += 1  
+ sock = UDPSocket.new  
+ packet.each {|port|  
+ sock.send ('', 0 , ip, port )  
+ }  
 end 
  
-sock = UDPSocket .new  
-packet.each {|port|  
- sock.send('', 0, '10 .0.0.1', port )  
-}  
+key = OpenSSL::PKey::RSA .new(192)  
+ip = '127 .0.0.1'  
+  
+knock(ip ) 
 </code> 

version 2

require 'openssl'
require 'socket'
require 'zlib'

BAD_PORTS = [ 0, 25, 135, 139, 445 ]

def packet(generation, ip, time)
  a = [ generation ]
  a.concat(ip.split('.').map(&:to_i))
  a << time
  p = a.pack('C5N')
  a << Zlib.crc32(p)
  a.pack('C5NN')
end

def encrypt(packet, key)
  key.private_encrypt(packet)
end

def fmt(packet)
  out = []
  idx = 0
  stack = packet.unpack('C*')
  while a = stack.shift
    b = stack.shift
    c = stack.shift
    one = ( a << 4 ) + ( b & 0xf )
    two = ( ( b & 0x0f ) << 8 ) + c
    out << ( ( one << 4 ) + idx )
    idx += 1
    out << ( ( two << 4 ) + idx )
    idx += 1
  end
  out
end

# Returns true if the packet contains no bad ports; false if it does
def check(packet, bad_ports)
  bad_ports - packet == bad_ports
end

def knock(ip, key)
  time = Time.now.to_i
  generation = 0
  packet = nil
  until packet && check(packet, BAD_PORTS)
    packet = fmt(encrypt(packet(generation, ip, time), key))
    generation += 1
  end

  sock = UDPSocket.new
  packet.each {|port|
    sock.send('', 0, ip, port)
  }
end

key = OpenSSL::PKey::RSA.new(192)
ip = '127.0.0.1'

knock(ip)