To simulate a sniffer attack project in OMNeT++ has needs to follow series of steps that contain to generate a network in which the malicious nodes disturbs and capture the network traffic among other nodes. A sniffer attack happens when an attacker eavesdrops to network traffic without the knowledge of the legitimate network participants that is particularly easy in unenclosed or poorly secured networks.
Here’s how to simulate a sniffer attack project in OMNeT++ using the INET framework:
Steps to Simulate Sniffer Attack Projects in OMNeT++
- Install OMNeT++ and INET Framework
- Download and install OMNeT++ from here.
- Download and install the INET framework from INET GitHub repository. INET contain all the components for network simulations (nodes, protocols, etc.).
- Understand the Key Components of a Sniffer Attack Simulation
In this scenario:
- Legitimate nodes: These nodes interact over the network, unaware of the sniffer.
- Sniffer node: The malicious node captures network traffic without being classified. The sniffer can either passively eavesdrop to the traffic or actively participate in the network.
- Traffic capturing: The sniffer logs traffic and might evaluate or store the intercepted packets.
- Set up a Basic Network Topology in NED
Generate a simple network with a client, server, and a malicious sniffer node. The sniffer will capture traffic interchanged among the client and server.
Example NED File for the Network:
network SnifferAttackNetwork {
submodules:
client: StandardHost {
@display(“p=100,200”);
}
server: StandardHost {
@display(“p=300,200”);
}
sniffer: StandardHost {
@display(“p=200,150”);
}
connections allowunconnected:
client.ethg++ <–> Eth100M <–> sniffer.ethg++;
sniffer.ethg++ <–> Eth100M <–> server.ethg++;
}
Explanation:
- Client: The source of legitimate traffic.
- Server: The destination of the traffic.
- Sniffer: Positioned among the client and server to interrupt traffic.
- Configure Legitimate Communication
Describe the communication among the client and server using standard protocols such as TCP or UDP. The sniffer will capture this communication.
Example omnetpp.ini Configuration for TCP Traffic:
network = SnifferAttackNetwork
sim-time-limit = 100s
# Server application settings (running TCP)
**.server.numApps = 1
**.server.app[0].typename = “TcpServerApp”
**.server.app[0].localPort = 80
# Client application settings (running TCP)
**.client.numApps = 1
**.client.app[0].typename = “TcpApp”
**.client.app[0].connectAddress = “server” # Connect to server
**.client.app[0].connectPort = 80
**.client.app[0].tOpen = 0s # Start sending immediately
**.client.app[0].sendBytes = 5000B # Send 5000 bytes
# Sniffer node settings (capture traffic)
**.sniffer.numApps = 1
**.sniffer.app[0].typename = “PacketSnifferApp”
Explanation:
- The client begins a connection to the server over TCP and sends 5000 bytes of data.
- The sniffer node utilizes a custom application (PacketSnifferApp) to capture traffic.
- Implement a Custom Sniffer Application
We need to generate a custom application for the sniffer node that eavesdrops to all incoming and outgoing traffic. we can prolong a basic application in OMNeT++ to capture and log packets.
Example Custom PacketSnifferApp in C++:
#include “inet/applications/base/ApplicationBase.h”
#include “inet/common/packet/Packet.h”
#include “inet/networklayer/common/L3AddressResolver.h”
class PacketSnifferApp : public inet::ApplicationBase {
protected:
virtual void initialize(int stage) override;
virtual void handleMessage(cMessage *msg) override;
virtual void handlePacket(inet::Packet *pkt);
public:
PacketSnifferApp() {}
virtual ~PacketSnifferApp() {}
};
Define_Module(PacketSnifferApp);
void PacketSnifferApp::initialize(int stage) {
if (stage == inet::INITSTAGE_APPLICATION_LAYER) {
EV << “Packet Sniffer initialized” << endl;
}
}
void PacketSnifferApp::handleMessage(cMessage *msg) {
inet::Packet *pkt = check_and_cast<inet::Packet *>(msg);
handlePacket(pkt);
}
void PacketSnifferApp::handlePacket(inet::Packet *pkt) {
EV << “Sniffer captured packet: ” << pkt->getFullName() << endl;
// Log the packet’s details (source, destination, contents)
auto srcAddr = pkt->getTag<inet::L3AddressInd>()->getSrcAddress();
auto destAddr = pkt->getTag<inet::L3AddressInd>()->getDestAddress();
EV << “Captured from ” << srcAddr << ” to ” << destAddr << endl;
// Optionally forward the packet to its intended destination
send(pkt, “out”);
}
In this code:
- PacketSnifferApp captures all incoming and outgoing packets on the sniffer node.
- EV Logging: Logs packet information (source, destination, etc.) to the console for evaluation.
- Optionally, the sniffer can forward the packet to mitigate detection.
- Capture both Incoming and Outgoing Traffic
To make sure that the sniffer captures all relevant traffic, set up the sniffer’s interfaces to receive packets on both incoming and outgoing links.
Example Interface Settings in omnetpp.ini:
# Enable promiscuous mode on the sniffer’s interfaces to capture all traffic
**.sniffer.eth[0].promiscuous = true
**.sniffer.eth[1].promiscuous = true
- Simulate More Advanced Sniffer Behaviors
We can prolong the sniffer’s capabilities to replicate more advanced features, such as:
- Selective capturing: Capture only certain kinds of traffic (e.g., based on source IP, destination IP, or protocol).
- Logging payloads: Log the packet contents (payloads) for further evaluation.
- Analyzing traffic patterns: Execute functionality to identify patterns in the captured traffic (such as repeated TCP handshakes).
- Run the Simulation
Once we have configured the client, server, and sniffer, process the simulation in OMNeT++:
- The client will transmit data to the server over the network.
- The sniffer will capture this traffic, log details, and optionally evaluate the packets.
- Analyze Simulation Results
OMNeT++’s scalar and vector recording tools can help you to measure the performance of the network and the efficiency of the sniffer attack. Key parameter that contain:
- Number of packets captured: Count how many packets were successfully interrupted.
- Source and destination addresses: Record in which the captured packets originated from and where they were headed.
- Packet types: Monitor the types of traffic interrupted (e.g., TCP, UDP, ARP).
Utilize OMNeT++’s logging capabilities (EV << …) to output captured packet details to the console for evaluation.
- Extend the Simulation
We can further improve the sniffer simulation by:
- Sniffer detection: Apply the mechanisms in the client or server to identify if a sniffer is present (e.g., detecting changes in packet timing or ARP spoofing).
- Simulating encrypted traffic: Incorporate encoded communication to see how the sniffer manages encrypted packets.
- Active sniffer: Apply a sniffer that not only captures however also modifies or inserts packets into the network (such as for Man-in-the-Middle attacks).
Example Projects for Sniffer Attack Simulation:
- Basic Sniffer Attack: Implement a sniffer capturing TCP traffic among two nodes and logging packet details.
- Encrypted Traffic Sniffing: Implement a scenario in which the sniffer captures encoded traffic and evaluate the differences related to plain-text traffic.
- Sniffer Detection: Apply detection mechanisms on the client or server that detect the presence of a sniffer in terms of network anomalies.
- Selective Traffic Sniffing: prolong the sniffer to capture only certain kinds of traffic, like HTTP or DNS requests according to packet headers.
In the obtainable manual will established the simulation process that supports to implement the sniffer attack project and measure their performance OMNeT++ tool. More details will be offered on this sniffer attack project in upcoming manual.
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