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How to Implement firewall attack in ns3

To implement a firewall attack in ns3, we need to mimic to protect a target node from attacker by bypass or devastate a firewall. Meanwhile ns3 don’t have built-in firewall out of box, but we need implement the presence of firewall by packet filters and protocols to hamper the traffic. Here are the procedures on how to implement the firewall attack in ns3 projects.

Steps to Implement a Firewall Attack in ns3

  1. Set Up ns3 Environment:
    • Make sure ns3 is installed in the computer.
  2. Create a New ns3 Script:
    • Create a new script file in the scratch directory of ns3, e.g., firewall_attack.cc.
  3. Include Necessary Headers:
    • Include the necessary ns3 headers in your script.
  4. Define Network Topology:
    • Set up a network topology with legitimate nodes, an attacker node, and a node acting as a firewall.
  5. Implement Firewall Logic:
    • To simulate firewall rules by use packet filters.
  6. Implement Firewall Attack Logic:
    • Use the attacker node to send packets attempting to bypass the firewall.
  7. Enable Packet Capture:
    • Enable pcap tracing to capture packets for analysis with Wireshark.
  8. Run the Simulation:
    • Set the simulation time and run the simulation using Simulator::Run() and Simulator::Destroy().

Example Code:

The given below are the sample illustrative steps for firewall attack in ns3 tool:

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/point-to-point-module.h”

#include “ns3/applications-module.h”

#include “ns3/ipv4.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“FirewallAttack”);

// Packet filter function to simulate firewall rules

bool FirewallFilter (Ptr<const Packet> packet, Ptr<Ipv4> ipv4, uint32_t interface)

{

Ipv4Header ipv4Header;

packet->PeekHeader (ipv4Header);

// Example rule: block all traffic from attacker (10.1.1.1)

if (ipv4Header.GetSource () == Ipv4Address (“10.1.1.1”))

{

NS_LOG_INFO (“Firewall dropped packet from: ” << ipv4Header.GetSource ());

return false; // Drop packet

}

return true; // Allow packet

}

void SendPackets (Ptr<Node> node, Ipv4Address destAddress, uint16_t port, uint32_t packetSize, uint32_t numPackets, Time interval)

{

Ptr<Socket> socket = Socket::CreateSocket (node, TypeId::LookupByName (“ns3::UdpSocketFactory”));

InetSocketAddress remote = InetSocketAddress (destAddress, port);

socket->Connect (remote);

Ptr<Packet> packet = Create<Packet> (packetSize);

for (uint32_t i = 0; i < numPackets; ++i)

{

socket->Send (packet);

Simulator::Schedule (interval, &SendPackets, node, destAddress, port, packetSize, numPackets, interval);

}

}

int main (int argc, char *argv[])

{

bool verbose = true;

uint32_t nNodes = 3; // Number of legitimate nodes

uint16_t port = 8080; // Target port for the attack

uint32_t packetSize = 1024; // Size of the packet

uint32_t numPackets = 10; // Number of packets to send

Time interval = Seconds (1.0); // Interval between packets

CommandLine cmd;

cmd.AddValue (“nNodes”, “Number of legitimate nodes”, nNodes);

cmd.AddValue (“port”, “Target port for the attack”, port);

cmd.AddValue (“packetSize”, “Size of the packets”, packetSize);

cmd.AddValue (“numPackets”, “Number of packets”, numPackets);

cmd.AddValue (“interval”, “Interval between packets”, interval);

cmd.Parse (argc, argv);

if (verbose)

{

LogComponentEnable (“FirewallAttack”, LOG_LEVEL_INFO);

}

NodeContainer nodes;

nodes.Create (nNodes + 1); // +1 for the attacker node

Ptr<Node> attacker = nodes.Get (nNodes);

PointToPointHelper pointToPoint;

pointToPoint.SetDeviceAttribute (“DataRate”, StringValue (“5Mbps”));

pointToPoint.SetChannelAttribute (“Delay”, StringValue (“2ms”));

NetDeviceContainer devices;

for (uint32_t i = 0; i < nodes.GetN () – 1; ++i)

{

devices.Add (pointToPoint.Install (nodes.Get (i), nodes.Get (i + 1)));

}

InternetStackHelper stack;

stack.Install (nodes);

Ipv4AddressHelper address;

address.SetBase (“10.1.1.0”, “255.255.255.0”);

Ipv4InterfaceContainer interfaces = address.Assign (devices);

// Install application

Explanation:

At this point, we provide the detailed description of firewall attacks given below;

  1. Nodes and Links:
    • Created nodes for legitimate communication and one attacker node.
    • Configured point-to-point links between the nodes.
  2. Applications:
    • Installed a UDP echo server on one of the legitimate nodes.
    • Installed a UDP echo client on another legitimate node to generate traffic.
  3. Firewall Logic:
    • Implemented a FirewallFilter function to simulate firewall rules.
    • Connected the firewall filter to the node acting as the firewall using TraceConnectWithoutContext.
  4. Firewall Attack Logic:
    • Implemented a SendPackets function to create and send packets from the attacker node to the victim node, attempting to bypass the firewall.
    • Scheduled the firewall attack to start at a specific time in the simulation.
  5. Packet Capture:
    • Enabled pcap tracing on all nodes to capture the traffic for analysis with Wireshark.
  6. Running the Simulation:
    • The simulation runs with the attacker node sending packets to the victim node, and the traffic is captured in pcap files.

Overall, we had implemented the firewall attacks by protecting the target node using ns3 simulated tool and we also elaborate how the firewall attack is executed in other tools.

Implementation of the firewall attack in ns3 is quite easy with the help of our developers, so stay in touch with ns3simulation.com for best assistance.