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|---|---|---|
| @@ -1,103 +1,126 @@ | ||
| import socket | ||
| import optparse | ||
| # The MIT License (MIT) | ||
| # | ||
| # Copyright (c) 2014-2016 Leon Jacobs | ||
| # | ||
| # Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| # of this software and associated documentation files (the "Software"), to deal | ||
| # in the Software without restriction, including without limitation the rights | ||
| # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| # copies of the Software, and to permit persons to whom the Software is | ||
| # furnished to do so, subject to the following conditions: | ||
| # | ||
| # The above copyright notice and this permission notice shall be included in all | ||
| # copies or substantial portions of the Software. | ||
| # | ||
| # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| # SOFTWARE. | ||
|
|
||
| import getpass | ||
| from lib.FrameProcessor import ProcessFrame | ||
| import optparse | ||
| import socket | ||
|
|
||
| def main(ip, port, out_file, secret): | ||
| from lib.FrameProcessor import ProcessFrame | ||
|
|
||
| # setup the socket | ||
| sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) | ||
| sock.bind((ip, port)) | ||
|
|
||
| frameHandler = ProcessFrame() | ||
| def main(ip, port, out_file, secret): | ||
| # setup the socket | ||
| sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) | ||
| sock.bind((ip, port)) | ||
|
|
||
| # Set the secret if we have one configured | ||
| if secret: | ||
| frameHandler.setSecret(secret) | ||
| frame_handler = ProcessFrame() | ||
|
|
||
| print '[INFO] Fake DNS server listening on', ip, '/', port, 'with a configured secret.' if secret else '' | ||
| # Set the secret if we have one configured | ||
| if secret: | ||
| frame_handler.set_secret(secret) | ||
|
|
||
| # if we have a file destination to write to, set it | ||
| if out_file: | ||
| frameHandler.setOutfile(out_file) | ||
| print '[INFO] Fake DNS server listening on', ip, '/', port, 'with a configured secret.' if secret else '' | ||
|
|
||
| # Start a never ending loop and receive the UDP frames in sock | ||
| # From: http://code.activestate.com/recipes/491264-mini-fake-dns-server/ | ||
| while True: | ||
| # if we have a file destination to write to, set it | ||
| if out_file: | ||
| frame_handler.set_outfile(out_file) | ||
|
|
||
| # read the socket | ||
| data, addr = sock.recvfrom(1024) # buffer size is 1024 bytes | ||
| # Start a never ending loop and receive the UDP frames in sock | ||
| # From: http://code.activestate.com/recipes/491264-mini-fake-dns-server/ | ||
| while True: | ||
|
|
||
| # read the socket | ||
| data, addr = sock.recvfrom(1024) # buffer size is 1024 bytes | ||
|
|
||
| # Determine the OPCODE for the query. | ||
| op_code = (ord(data[2]) >> 3) & 15 | ||
| # Determine the OPCODE for the query. | ||
| op_code = (ord(data[2]) >> 3) & 15 | ||
|
|
||
| # OPCODE 0 == Standard query http://www.networksorcery.com/enp/protocol/dns.htm#Opcode | ||
| if op_code == 0: | ||
| # OPCODE 0 == Standard query http://www.networksorcery.com/enp/protocol/dns.htm#Opcode | ||
| if op_code == 0: | ||
|
|
||
| # the raw packet has the name we are querying starting at byte 12 | ||
| byte_name_start=12 | ||
| byte_name_length=ord(data[byte_name_start]) | ||
| domain = '' | ||
| # the raw packet has the name we are querying starting at byte 12 | ||
| byte_name_start = 12 | ||
| byte_name_length = ord(data[byte_name_start]) | ||
| domain = '' | ||
|
|
||
| # set the frame to decode, as we are promarily interested in the | ||
| # first part of the question | ||
| frame_to_decode = data[byte_name_start + 1:byte_name_start + byte_name_length + 1] | ||
| # set the frame to decode, as we are promarily interested in the | ||
| # first part of the question | ||
| frame_to_decode = data[byte_name_start + 1:byte_name_start + byte_name_length + 1] | ||
|
|
||
| # Continue working with the rest of the request and process a response | ||
| # we will also lookup the state in ProcessFrame to determine the IP | ||
| # response we should be seeing | ||
| while byte_name_length != 0: | ||
| # Continue working with the rest of the request and process a response | ||
| # we will also lookup the state in ProcessFrame to determine the IP | ||
| # response we should be seeing | ||
| while byte_name_length != 0: | ||
| domain += data[byte_name_start + 1:byte_name_start + byte_name_length + 1] + '.' | ||
|
|
||
| domain += data[byte_name_start + 1:byte_name_start + byte_name_length + 1] + '.' | ||
| byte_name_start += byte_name_length + 1 | ||
| byte_name_length = ord(data[byte_name_start]) | ||
|
|
||
| byte_name_start+= byte_name_length + 1 | ||
| byte_name_length=ord(data[byte_name_start]) | ||
| print '[INFO] Full resource record query was for:', domain | ||
|
|
||
| print '[INFO] Full resource record query was for:', domain | ||
| # send the frame to the processor | ||
| frame_handler.set_data(frame_to_decode) | ||
| frame_handler.process() | ||
|
|
||
| # send the frame to the processor | ||
| frameHandler.setData(frame_to_decode) | ||
| frameHandler.process() | ||
| # prepare the response packet | ||
| response_packet = '' | ||
|
|
||
| # prepare the response packet | ||
| response_packet = '' | ||
| if domain: | ||
| response_packet += data[:2] + "\x81\x80" | ||
| response_packet += data[4:6] + data[4:6] + '\x00\x00\x00\x00' # Questions and Answers Counts | ||
| response_packet += data[12:] # Original Domain Name Question | ||
| response_packet += '\xc0\x0c' # Pointer to domain name | ||
| # Response type, ttl and resource data length -> 4 bytes | ||
| response_packet += '\x00\x01\x00\x01\x00\x00\x00\x3c\x00\x04' | ||
| response_packet += str.join('', map(lambda x: chr(int(x)), '127.0.0.1'.split('.'))) # 4bytes of IP | ||
|
|
||
| if domain: | ||
| response_packet+=data[:2] + "\x81\x80" | ||
| response_packet+=data[4:6] + data[4:6] + '\x00\x00\x00\x00' # Questions and Answers Counts | ||
| response_packet+=data[12:] # Original Domain Name Question | ||
| response_packet+='\xc0\x0c' # Pointer to domain name | ||
| response_packet+='\x00\x01\x00\x01\x00\x00\x00\x3c\x00\x04' # Response type, ttl and resource data length -> 4 bytes | ||
| response_packet+=str.join('',map(lambda x: chr(int(x)), '127.0.0.1'.split('.'))) # 4bytes of IP | ||
| sock.sendto(response_packet, addr) | ||
|
|
||
| sock.sendto(response_packet, addr) | ||
|
|
||
| if __name__ == '__main__': | ||
|
|
||
| parser = optparse.OptionParser("usage: %prog -L <ip>") | ||
| parser.add_option('-L', '--listen', dest='listen', | ||
| type='string', help='specify hostname to listen on') | ||
| parser.add_option('-p', '--port', dest='port', default=53, | ||
| type='int', help='port number to listen on (Defaults: 53)') | ||
| parser.add_option('-O', '--outfile', dest='out', default='', | ||
| type='string', help='specify a message file destination') | ||
| parser.add_option('-s', '--secret', dest='secret', default=False, | ||
| action='store_true', help='Set the secret used for the AES encryption') | ||
| parser = optparse.OptionParser("usage: %prog -L <ip>") | ||
| parser.add_option('-L', '--listen', dest='listen', | ||
| type='string', help='specify hostname to listen on') | ||
| parser.add_option('-p', '--port', dest='port', default=53, | ||
| type='int', help='port number to listen on (Defaults: 53)') | ||
| parser.add_option('-O', '--outfile', dest='out', default='', | ||
| type='string', help='specify a message file destination') | ||
| parser.add_option('-s', '--secret', dest='secret', default=False, | ||
| action='store_true', help='Set the secret used for the AES encryption') | ||
|
|
||
| (options, args) = parser.parse_args() | ||
| (options, args) = parser.parse_args() | ||
|
|
||
| if not options.listen: | ||
| parser.error('At least a listening IP must be provided.') | ||
| if not options.listen: | ||
| parser.error('At least a listening IP must be provided.') | ||
|
|
||
| if options.secret: | ||
| secret = getpass.getpass(prompt='What is the secret? ') | ||
| else: | ||
| secret = None | ||
| if options.secret: | ||
| secret = getpass.getpass(prompt='What is the secret? ') | ||
| else: | ||
| secret = None | ||
|
|
||
| listening_ip = options.listen | ||
| listening_port = options.port | ||
| out_file = options.out | ||
| listening_ip = options.listen | ||
| listening_port = options.port | ||
| out_file = options.out | ||
|
|
||
| # kick off the main loop | ||
| main(listening_ip, listening_port, out_file, secret) | ||
| # kick off the main loop | ||
| main(listening_ip, listening_port, out_file, secret) |
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