124 lines
3.4 KiB
Python
124 lines
3.4 KiB
Python
#!/usr/bin/env python
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__author__ = "Moxie Marlinspike"
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__email__ = "moxie@thoughtcrime.org"
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__license__= """
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Copyright (c) 2009 Moxie Marlinspike <moxie@thoughtcrime.org>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA
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"""
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import time, os, sys
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import getopt
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import subprocess
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from struct import *
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from knocknock3.Profile import Profile
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def usage():
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print("Usage: knocknock3.py -p <portToOpen> <host>")
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sys.exit(2)
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def parseArguments(argv):
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try:
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port = 0
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host = ""
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opts, args = getopt.getopt(argv, "h:p:")
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for opt, arg in opts:
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if opt in ("-p"):
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port = arg
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else:
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usage()
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if len(args) != 1:
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usage()
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else:
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host = args[0]
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except getopt.GetoptError:
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usage()
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if port == 0 or host == "":
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usage()
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return (port, host)
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def getProfile(host):
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homedir = os.path.expanduser('~')
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if not os.path.isdir(homedir + '/.knocknock3/'):
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print("Error: you need to setup your profiles in " + homedir + '/.knocknock3/')
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sys.exit(2)
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if not os.path.isdir(homedir + '/.knocknock3/' + host):
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print('Error: profile for host ' + host + ' not found at ' + homedir + '/.knocknock3/' + host)
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sys.exit(2)
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return Profile(homedir + '/.knocknock3/' + host)
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def verifyPermissions():
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if os.getuid() != 0:
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print('Sorry, you must be root to run this.')
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sys.exit(2)
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def existsInPath(command):
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def isExe(fpath):
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return os.path.exists(fpath) and os.access(fpath, os.X_OK)
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for path in os.environ["PATH"].split(os.pathsep):
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exeFile = os.path.join(path, command)
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if isExe(exeFile):
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return exeFile
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return None
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def main(argv):
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(port, host) = parseArguments(argv)
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verifyPermissions()
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profile = getProfile(host)
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port = pack('!H', int(port))
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packetData = profile.encrypt(port)
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knockPort = profile.getKnockPort()
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(idField, seqField, ackField, winField) = unpack('!HIIH', packetData)
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hping = existsInPath("hping3")
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if hping is None:
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print("Error, you must install hping3 first.")
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sys.exit(2)
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command = [hping, "-S", "-c", "1",
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"-p", str(knockPort),
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"-N", str(idField),
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"-w", str(winField),
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"-M", str(seqField),
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"-L", str(ackField),
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host]
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try:
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subprocess.call(command, shell=False, stdout=open('/dev/null', 'w'), stderr=subprocess.STDOUT)
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print('Knock sent.')
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except OSError:
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print("Error: Do you have hping3 installed?")
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sys.exit(3)
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if __name__ == '__main__':
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main(sys.argv[1:])
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