ⓘ GNUnet

                                     

ⓘ GNUnet

GNUnet is a software framework for decentralized, peer-to-peer networking and an official GNU package. The framework offers link encryption, peer discovery, resource allocation, communication over many transports and various basic peer-to-peer algorithms for routing, multicast and network size estimation.

GNUnets basic network topology is that of a mesh network. GNUnet includes a distributed hash table DHT which is a randomized variant of Kademlia that can still efficiently route in small-world networks. GNUnet offers a "F2F topology" option for restricting connections to only the users trusted friends. The users friends own friends and so on can then indirectly exchange files with the users computer, never using its IP address directly.

GNUnet uses Uniform resource identifiers not approved by IANA, although an application has been made. GNUnet URIs consist of two major parts: the module and the module specific identifier. A GNUnet URI is of form gnunet://module/identifier where module is the module name and identifier is a module specific string.

The primary codebase is written in C, but there are bindings in other languages to produce an API for developing extensions in those languages. GNUnet is part of the GNU Project. It has gained interest to the hacker community after the PRISM revelations.

GNUnet consists of several subsystems, of which essential ones are Transport and Core subsystems. Transport subsystem provides insecure link-layer communications, while Core provides peer discovery and encryption. On top of the core subsystem various applications are built.

GNUnet includes various P2P applications in the main distribution of the framework, including filesharing, chat and VPN; additionally, a few external projects such as secushare are also extending the GNUnet infrastructure.

GNUnet is unrelated to the older Gnutella P2P protocol. Gnutella is not an official GNU project while GNUnet is.

                                     

1. Transport

Originally, GNUnet used UDP for underlying transport. Now GNUnet transport subsystem provides multiple options, such as TCP and SMTP.

The communication port, officially registered at IANA, is 2086 tcp + udp.

                                     

2. Trust system

GNUnet provides trust system based on excess-based economic model. The idea of employing economic system is taken from MojoNation network.

GNUnet network has no trusted entities so it is impossible to maintain global reputation. Instead, each peer maintains its own trust for each of its local links.

When resources, such as bandwidth and CPU time, are in excess, peer provides them to all requesting neighbors without reducing trust or otherwise charging them. When a node is under stress it drops requests from its neighbor nodes having lower internal trust value. However, when peer has less resources than enough to fulfill everyones requests, it denies requests of those neighbors that it trusts less and charges others by reducing their trust.

                                     

3. File sharing

The primary application at this point is anonymous, censorship-resistant file-sharing, allowing users to anonymously publish or retrieve information of all kinds. The GNUnet protocol which provides anonymity is called GAP GNUnet anonymity protocol. GNUnet FS can additionally make use of GNU libextractor to automatically annotate shared files with metadata.

                                     

3.1. File sharing File encoding

Files shared with GNUnet are ECRS An Encoding for Censorship-Resistant Sharing coded.

All content is represented as GBlocks. Each GBlock contains 1024 bytes. There are several types of GBlocks, each of them serves a particular purpose. Any GBlock B {\displaystyle B} is uniquely identified by its RIPEMD-160 hash H B {\displaystyle HB}.

DBlocks store actual file contents and nothing else. File is split at 1024 byte boundaries and resulting chunks are stored in DBlocks. DBlocks are linked together into Merkle tree by means of IBlocks that store DBlock identifiers.

Blocks are encrypted with a symmetric key derived from H B {\displaystyle HB} when they are stored in the network.

                                     

3.2. File sharing Queries and replies

GNUnet Anonymity Protocol consists of queries and replies. Depending on load of the forwarding node, messages are forwarded to zero or more nodes.

Queries are used to search for content and request data blocks.

Query contains resource identifier, reply address, priority and TTL Time-to-Live.

Resource identifier of datum Q {\displaystyle Q} is a triple-hash H Q) {\displaystyle HHHQ)}. Peer that replies to query provides H Q) {\displaystyle HHQ)} to prove that it indeed has the requested resource without providing H Q {\displaystyle HQ} to intermediate nodes, so intermediate nodes cant decrypt Q {\displaystyle Q}.

Reply address is the major difference compared to Freenet protocol. While in Freenet reply always propagates back using the same path as the query, in GNUnet the path may be shorter. Peer receiving a query may drop it, forward it without rewriting reply address or indirect it by replacing reply address with its own address. By indirecting queries peer provides cover traffic for its own queries, while by forwarding them peer avoids being a link in reply propagation and preserves its bandwidth. This feature allows the user to trade anonymity for efficiency. User can specify an anonymity level for each publish, search and download operation. An anonymity level of zero can be used to select non-anonymous file-sharing. GNUnets DHT infrastructure is only used if non-anonymous file-sharing is specified. The anonymity level determines how much cover traffic a peer must have to hide the users own actions.

Priority specifies how much of its trust user wants to spend in case of resource shortage.

TTL is used to prevent queries from staying in the network for too long.



                                     

3.3. File sharing File sharing URIs

The fs module identifier consists of either chk, sks, ksk or loc followed by a slash and a category specific value. Most URIs contain hashes, which are encoded in base32hex.

  • chk identifies files, typically: gnunet://fs/chk/*
  • loc identifies a datum on a specific machine, typically: gnunet://fs/loc/PEER/QUERY.TYPE.KEY.SIZE


                                     

3.4. File sharing Examples

A type of GNUnet filesharing URI pointing to a specific copy of GNU GPL license text: gnunet://fs/chk/9E4MDN4VULE8KJG6U1C8FKH5HA8C5CHSJTILRTTPGK8MJ6VHORERHE68JU8Q0FDTOH1DGLUJ3NLE99N0ML0N9PIBAGKG7MNPBTT6UKG.1I823C58O3LKS24LLI9KB384LH82LGF9GUQRJHACCUINSCQH36SI4NF88CMAET3T3BHI93D4S0M5CC6MVDL1K8GFKVBN69Q6T307U6O.17992

Another type of GNUnet filesharing URI, pointing to the search results of a search with keyword "gpl": gnunet://fs/ksk/gpl

                                     

4. GNU Name System

GNUnet includes an implementation of the GNU Name System GNS, a decentralized and censorship-resistant replacement for DNS. In GNS, each user manages their own zones and can delegate subdomains to zones managed by other users. Lookups of records defined by other users are performed using GNUnets DHT.

                                     

5. Protocol translation

GNUnet can tunnel IP traffic over the peer-to-peer network. If necessary, GNUnet can perform IPv4-IPv6 protocol translation in the process. GNUnet provides a DNS Application-level gateway to proxy DNS requests and map addresses to the desired address family as necessary. This way, GNUnet offers a possible technology to facilitate IPv6 transition. Furthermore, in combination with GNS, GNUnets protocol translation system can be used to access hidden services - IP-based services that run locally at some peer in the network and which can only be accessed by resolving a GNS name.

                                     

6. Social API

Gabor X Toth published in early September 2013 a thesis to present the design of a social messaging service for the GNUnet peer-to-peer framework that offers scalability, extensibility, and end-to-end encrypted communication. The scalability property is achieved through multicast message delivery, while extensibility is made possible by using PSYC Protocol for SYnchronous Conferencing, which provides an extensible RPC Remote Procedure Call syntax that can evolve over time without having to upgrade the software on all nodes in the network. Another key feature provided by the PSYC layer are stateful multicast channels, which are used to store e.g. user profiles. End-to-end encrypted communication is provided by the mesh service of GNUnet, upon which the multicast channels are built. Pseudonymous users and social places in the system have cryptographical identities - identified by their public key - these are mapped to human memorable names using GNS GNU Name System, where each pseudonym has a zone pointing to its places.

That is the required building block for turning the GNUnet framework into a fully peer-to-peer social networking platform.



                                     
  • Schanzenbach, Martin 2019 - 07 - 24 2019 - 07 - 24: GNUnet 0.11.6 released gnunet org. Retrieved 2019 - 07 - 31. GNUnet download website Archived from the original
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