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Niels Provos and Thorsten Holz
Honeyd is a small daemon that creates virtual hosts on a network. The hosts can be configured to run arbitrary services, and their personality can be adapted so that they appear to be running certain operating systems. Honeyd enables a single host to claim multiple addresses - I have tested up to 65536 - on a LAN for network simulation. Honeyd improves cyber security by providing mechanisms for threat detection and assessment. It also deters adversaries by hiding real systems in the middle of virtual systems.
It is possible to ping the virtual machines, or to traceroute them. Any type of service on the virtual machine can be simulated according to a simple configuration file. Instead of simulating a service, it is also possible to proxy it to another machine.
The different TCP personalities are learned from reading a nmap fingerprint file. The configured personality is the operating system that nmap or xprobe will return. Personalities can be annotated to determine if they allow FIN-scans for open ports or to select the preference in which they reassemble fragmented IP packets.
Honeyd can be used to create a virtual honey net or for general network monitoring. It supports the creation of a virtual network topology including dedicated routes and routers. The routes can be attributed with latency and packet loss to make the topology seem more realistic.
Because Honeyd interacts with potentially malicious adversaries, you should sandbox it with Systrace. Systrace prevents an adversary from exploiting bugs in your Honeyd scripts.
Honeyd supports a variey of features that make the daemon very flexible for creating both host based and netword based virtual honeypots. The following list gives a brief overview of the different features that Honeyd supports:
Honeyd supports service virtualization by executing Unix applications as subsystems running in the virtual IP address space of a configured honeypot. This allows any network application to dynamically bind ports, create TCP and UDP connections using a virtual IP address.
Subsystems are virtualized by intercepting their network requests and redirecting them to Honeyd. Every configuration template may contain subsystems that are started as separated processes when the template is bound to a virtual IP address. An additional benefit of this approach is the ability of honeypots to create sporadic background traffic like requesting web pages and reading email, etc.
Internet In The Box
Honeyd supports assymetric routes and the integration of physical machines into the virtual network topology. As a result, it is possible to use Honeyd for simple network simulations: Physical hosts can be exposed to high latency or packet loss, arbitrary routing infrastructures, etc.
Using GRE tunneling allows the creation of distributed setups that allow Honeyd to scale to larger networks. It also allows virtual machines to be spread across separate address spaces as GRE tunnel selection can be based on the source addresses.
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