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// Copyright 2019 Parity Technologies (UK) Ltd.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//! [Noise protocol framework][noise] support for libp2p.
//!
//! > **Note**: This crate is still experimental and subject to major breaking changes
//! > both on the API and the wire protocol.
//!
//! This crate provides `libp2p_core::InboundUpgrade` and `libp2p_core::OutboundUpgrade`
//! implementations for various noise handshake patterns (currently `IK`, `IX`, and `XX`)
//! over a particular choice of Diffie–Hellman key agreement (currently only X25519).
//!
//! > **Note**: Only the `XX` handshake pattern is currently guaranteed to provide
//! > interoperability with other libp2p implementations.
//!
//! All upgrades produce as output a pair, consisting of the remote's static public key
//! and a `NoiseOutput` which represents the established cryptographic session with the
//! remote, implementing `futures::io::AsyncRead` and `futures::io::AsyncWrite`.
//!
//! # Usage
//!
//! Example:
//!
//! ```
//! use libp2p_core::{identity, Transport, upgrade};
//! use libp2p::tcp::TcpTransport;
//! use libp2p::noise::{Keypair, X25519Spec, NoiseAuthenticated};
//!
//! # fn main() {
//! let id_keys = identity::Keypair::generate_ed25519();
//! let noise = NoiseAuthenticated::xx(&id_keys).unwrap();
//! let builder = TcpTransport::default().upgrade(upgrade::Version::V1).authenticate(noise);
//! // let transport = builder.multiplex(...);
//! # }
//! ```
//!
//! [noise]: http://noiseprotocol.org/
#![cfg_attr(docsrs, feature(doc_cfg, doc_auto_cfg))]
mod io;
mod protocol;
pub use io::handshake::RemoteIdentity;
pub use io::NoiseOutput;
pub use protocol::{x25519::X25519, x25519_spec::X25519Spec};
pub use protocol::{AuthenticKeypair, Keypair, KeypairIdentity, PublicKey, SecretKey};
pub use protocol::{Protocol, ProtocolParams, IK, IX, XX};
use crate::handshake::State;
use crate::io::handshake;
use futures::future::BoxFuture;
use futures::prelude::*;
use libp2p_core::{identity, InboundUpgrade, OutboundUpgrade, PeerId, UpgradeInfo};
use std::pin::Pin;
use zeroize::Zeroize;
/// The protocol upgrade configuration.
#[derive(Clone)]
pub struct NoiseConfig<P, C: Zeroize, R = ()> {
dh_keys: AuthenticKeypair<C>,
params: ProtocolParams,
legacy: LegacyConfig,
remote: R,
_marker: std::marker::PhantomData<P>,
/// Prologue to use in the noise handshake.
///
/// The prologue can contain arbitrary data that will be hashed into the noise handshake.
/// For the handshake to succeed, both parties must set the same prologue.
///
/// For further information, see <https://noiseprotocol.org/noise.html#prologue>.
prologue: Vec<u8>,
}
impl<H, C: Zeroize, R> NoiseConfig<H, C, R> {
/// Turn the `NoiseConfig` into an authenticated upgrade for use
/// with a `Swarm`.
pub fn into_authenticated(self) -> NoiseAuthenticated<H, C, R> {
NoiseAuthenticated { config: self }
}
/// Set the noise prologue.
pub fn with_prologue(self, prologue: Vec<u8>) -> Self {
Self { prologue, ..self }
}
/// Sets the legacy configuration options to use, if any.
pub fn set_legacy_config(&mut self, cfg: LegacyConfig) -> &mut Self {
self.legacy = cfg;
self
}
}
/// Implement `into_responder` and `into_initiator` for all configs where `R = ()`.
///
/// This allows us to ignore the `remote` field.
impl<H, C> NoiseConfig<H, C, ()>
where
C: Zeroize + Protocol<C> + AsRef<[u8]>,
{
fn into_responder<S>(self, socket: S) -> Result<State<S>, NoiseError> {
let session = self
.params
.into_builder(&self.prologue, self.dh_keys.keypair.secret(), None)
.build_responder()?;
let state = State::new(socket, session, self.dh_keys.identity, None, self.legacy);
Ok(state)
}
fn into_initiator<S>(self, socket: S) -> Result<State<S>, NoiseError> {
let session = self
.params
.into_builder(&self.prologue, self.dh_keys.keypair.secret(), None)
.build_initiator()?;
let state = State::new(socket, session, self.dh_keys.identity, None, self.legacy);
Ok(state)
}
}
impl<C> NoiseConfig<IX, C>
where
C: Protocol<C> + Zeroize,
{
/// Create a new `NoiseConfig` for the `IX` handshake pattern.
pub fn ix(dh_keys: AuthenticKeypair<C>) -> Self {
NoiseConfig {
dh_keys,
params: C::params_ix(),
legacy: LegacyConfig::default(),
remote: (),
_marker: std::marker::PhantomData,
prologue: Vec::default(),
}
}
}
impl<C> NoiseConfig<XX, C>
where
C: Protocol<C> + Zeroize,
{
/// Create a new `NoiseConfig` for the `XX` handshake pattern.
pub fn xx(dh_keys: AuthenticKeypair<C>) -> Self {
NoiseConfig {
dh_keys,
params: C::params_xx(),
legacy: LegacyConfig::default(),
remote: (),
_marker: std::marker::PhantomData,
prologue: Vec::default(),
}
}
}
impl<C> NoiseConfig<IK, C>
where
C: Protocol<C> + Zeroize,
{
/// Create a new `NoiseConfig` for the `IK` handshake pattern (recipient side).
///
/// Since the identity of the local node is known to the remote, this configuration
/// does not transmit a static DH public key or public identity key to the remote.
pub fn ik_listener(dh_keys: AuthenticKeypair<C>) -> Self {
NoiseConfig {
dh_keys,
params: C::params_ik(),
legacy: LegacyConfig::default(),
remote: (),
_marker: std::marker::PhantomData,
prologue: Vec::default(),
}
}
}
impl<C> NoiseConfig<IK, C, (PublicKey<C>, identity::PublicKey)>
where
C: Protocol<C> + Zeroize + AsRef<[u8]>,
{
/// Create a new `NoiseConfig` for the `IK` handshake pattern (initiator side).
///
/// In this configuration, the remote identity is known to the local node,
/// but the local node still needs to transmit its own public identity.
pub fn ik_dialer(
dh_keys: AuthenticKeypair<C>,
remote_id: identity::PublicKey,
remote_dh: PublicKey<C>,
) -> Self {
NoiseConfig {
dh_keys,
params: C::params_ik(),
legacy: LegacyConfig::default(),
remote: (remote_dh, remote_id),
_marker: std::marker::PhantomData,
prologue: Vec::default(),
}
}
/// Specialised implementation of `into_initiator` for the `IK` handshake where `R != ()`.
fn into_initiator<S>(self, socket: S) -> Result<State<S>, NoiseError> {
let session = self
.params
.into_builder(
&self.prologue,
self.dh_keys.keypair.secret(),
Some(&self.remote.0),
)
.build_initiator()?;
let state = State::new(
socket,
session,
self.dh_keys.identity,
Some(self.remote.1),
self.legacy,
);
Ok(state)
}
}
/// libp2p_noise error type.
#[derive(Debug, thiserror::Error)]
#[non_exhaustive]
pub enum NoiseError {
#[error(transparent)]
Io(#[from] std::io::Error),
#[error(transparent)]
Noise(#[from] snow::Error),
#[error("Invalid public key")]
InvalidKey(#[from] identity::error::DecodingError),
#[error("Only keys of length 32 bytes are supported")]
InvalidLength,
#[error("Remote authenticated with an unexpected public key")]
UnexpectedKey,
#[error("The signature of the remote identity's public key does not verify")]
BadSignature,
#[error("Authentication failed")]
AuthenticationFailed,
#[error(transparent)]
InvalidPayload(DecodeError),
#[error(transparent)]
SigningError(#[from] identity::error::SigningError),
}
#[derive(Debug, thiserror::Error)]
#[error(transparent)]
pub struct DecodeError(prost::DecodeError);
impl From<prost::DecodeError> for NoiseError {
fn from(e: prost::DecodeError) -> Self {
NoiseError::InvalidPayload(DecodeError(e))
}
}
// Handshake pattern IX /////////////////////////////////////////////////////
/// Implements the responder part of the `IX` noise handshake pattern.
///
/// `IX` is a single round-trip (2 messages) handshake in which each party sends their identity over to the other party.
///
/// ```raw
/// initiator -{id}-> responder
/// initiator <-{id}- responder
/// ```
impl<T, C> InboundUpgrade<T> for NoiseConfig<IX, C>
where
NoiseConfig<IX, C>: UpgradeInfo,
T: AsyncRead + AsyncWrite + Unpin + Send + 'static,
C: Protocol<C> + AsRef<[u8]> + Zeroize + Clone + Send + 'static,
{
type Output = (RemoteIdentity<C>, NoiseOutput<T>);
type Error = NoiseError;
type Future = BoxFuture<'static, Result<(RemoteIdentity<C>, NoiseOutput<T>), NoiseError>>;
fn upgrade_inbound(self, socket: T, _: Self::Info) -> Self::Future {
async move {
let mut state = self.into_responder(socket)?;
handshake::recv_identity(&mut state).await?;
handshake::send_identity(&mut state).await?;
state.finish()
}
.boxed()
}
}
/// Implements the initiator part of the `IX` noise handshake pattern.
///
/// `IX` is a single round-trip (2 messages) handshake in which each party sends their identity over to the other party.
///
/// ```raw
/// initiator -{id}-> responder
/// initiator <-{id}- responder
/// ```
impl<T, C> OutboundUpgrade<T> for NoiseConfig<IX, C>
where
NoiseConfig<IX, C>: UpgradeInfo,
T: AsyncRead + AsyncWrite + Unpin + Send + 'static,
C: Protocol<C> + AsRef<[u8]> + Zeroize + Clone + Send + 'static,
{
type Output = (RemoteIdentity<C>, NoiseOutput<T>);
type Error = NoiseError;
type Future = BoxFuture<'static, Result<(RemoteIdentity<C>, NoiseOutput<T>), NoiseError>>;
fn upgrade_outbound(self, socket: T, _: Self::Info) -> Self::Future {
async move {
let mut state = self.into_initiator(socket)?;
handshake::send_identity(&mut state).await?;
handshake::recv_identity(&mut state).await?;
state.finish()
}
.boxed()
}
}
/// Implements the responder part of the `XX` noise handshake pattern.
///
/// `XX` is a 1.5 round-trip (3 messages) handshake.
/// The first message in a noise handshake is unencrypted. In the `XX` handshake pattern, that message
/// is empty and thus does not leak any information. The identities are then exchanged in the second
/// and third message.
///
/// ```raw
/// initiator --{}--> responder
/// initiator <-{id}- responder
/// initiator -{id}-> responder
/// ```
impl<T, C> InboundUpgrade<T> for NoiseConfig<XX, C>
where
NoiseConfig<XX, C>: UpgradeInfo,
T: AsyncRead + AsyncWrite + Unpin + Send + 'static,
C: Protocol<C> + AsRef<[u8]> + Zeroize + Clone + Send + 'static,
{
type Output = (RemoteIdentity<C>, NoiseOutput<T>);
type Error = NoiseError;
type Future = BoxFuture<'static, Result<(RemoteIdentity<C>, NoiseOutput<T>), NoiseError>>;
fn upgrade_inbound(self, socket: T, _: Self::Info) -> Self::Future {
async move {
let mut state = self.into_responder(socket)?;
handshake::recv_empty(&mut state).await?;
handshake::send_identity(&mut state).await?;
handshake::recv_identity(&mut state).await?;
state.finish()
}
.boxed()
}
}
/// Implements the initiator part of the `XX` noise handshake pattern.
///
/// `XX` is a 1.5 round-trip (3 messages) handshake.
/// The first message in a noise handshake is unencrypted. In the `XX` handshake pattern, that message
/// is empty and thus does not leak any information. The identities are then exchanged in the second
/// and third message.
///
/// ```raw
/// initiator --{}--> responder
/// initiator <-{id}- responder
/// initiator -{id}-> responder
/// ```
impl<T, C> OutboundUpgrade<T> for NoiseConfig<XX, C>
where
NoiseConfig<XX, C>: UpgradeInfo,
T: AsyncRead + AsyncWrite + Unpin + Send + 'static,
C: Protocol<C> + AsRef<[u8]> + Zeroize + Clone + Send + 'static,
{
type Output = (RemoteIdentity<C>, NoiseOutput<T>);
type Error = NoiseError;
type Future = BoxFuture<'static, Result<(RemoteIdentity<C>, NoiseOutput<T>), NoiseError>>;
fn upgrade_outbound(self, socket: T, _: Self::Info) -> Self::Future {
async move {
let mut state = self.into_initiator(socket)?;
handshake::send_empty(&mut state).await?;
handshake::recv_identity(&mut state).await?;
handshake::send_identity(&mut state).await?;
state.finish()
}
.boxed()
}
}
/// Implements the responder part of the `IK` handshake pattern.
///
/// `IK` is a single round-trip (2 messages) handshake.
///
/// In the `IK` handshake, the initiator is expected to know the responder's identity already, which
/// is why the responder does not send it in the second message.
///
/// ```raw
/// initiator -{id}-> responder
/// initiator <-{id}- responder
/// ```
impl<T, C> InboundUpgrade<T> for NoiseConfig<IK, C>
where
NoiseConfig<IK, C>: UpgradeInfo,
T: AsyncRead + AsyncWrite + Unpin + Send + 'static,
C: Protocol<C> + AsRef<[u8]> + Zeroize + Clone + Send + 'static,
{
type Output = (RemoteIdentity<C>, NoiseOutput<T>);
type Error = NoiseError;
type Future = BoxFuture<'static, Result<(RemoteIdentity<C>, NoiseOutput<T>), NoiseError>>;
fn upgrade_inbound(self, socket: T, _: Self::Info) -> Self::Future {
async move {
let mut state = self.into_responder(socket)?;
handshake::recv_identity(&mut state).await?;
handshake::send_signature_only(&mut state).await?;
state.finish()
}
.boxed()
}
}
/// Implements the initiator part of the `IK` handshake pattern.
///
/// `IK` is a single round-trip (2 messages) handshake.
///
/// In the `IK` handshake, the initiator knows and pre-configures the remote's identity in the
/// [`HandshakeState`](snow::HandshakeState).
///
/// ```raw
/// initiator -{id}-> responder
/// initiator <-{id}- responder
/// ```
impl<T, C> OutboundUpgrade<T> for NoiseConfig<IK, C, (PublicKey<C>, identity::PublicKey)>
where
NoiseConfig<IK, C, (PublicKey<C>, identity::PublicKey)>: UpgradeInfo,
T: AsyncRead + AsyncWrite + Unpin + Send + 'static,
C: Protocol<C> + AsRef<[u8]> + Zeroize + Clone + Send + 'static,
{
type Output = (RemoteIdentity<C>, NoiseOutput<T>);
type Error = NoiseError;
type Future = BoxFuture<'static, Result<(RemoteIdentity<C>, NoiseOutput<T>), NoiseError>>;
fn upgrade_outbound(self, socket: T, _: Self::Info) -> Self::Future {
async move {
let mut state = self.into_initiator(socket)?;
handshake::send_identity(&mut state).await?;
handshake::recv_identity(&mut state).await?;
state.finish()
}
.boxed()
}
}
// Authenticated Upgrades /////////////////////////////////////////////////////
/// A `NoiseAuthenticated` transport upgrade that wraps around any
/// `NoiseConfig` handshake and verifies that the remote identified with a
/// [`RemoteIdentity::IdentityKey`], aborting otherwise.
///
/// See [`NoiseConfig::into_authenticated`].
///
/// On success, the upgrade yields the [`PeerId`] obtained from the
/// `RemoteIdentity`. The output of this upgrade is thus directly suitable
/// for creating an [`authenticated`](libp2p_core::transport::upgrade::Authenticate)
/// transport for use with a `Swarm`.
#[derive(Clone)]
pub struct NoiseAuthenticated<P, C: Zeroize, R> {
config: NoiseConfig<P, C, R>,
}
impl NoiseAuthenticated<XX, X25519Spec, ()> {
/// Create a new [`NoiseAuthenticated`] for the `XX` handshake pattern using X25519 DH keys.
///
/// For now, this is the only combination that is guaranteed to be compatible with other libp2p implementations.
pub fn xx(id_keys: &identity::Keypair) -> Result<Self, NoiseError> {
let dh_keys = Keypair::<X25519Spec>::new();
let noise_keys = dh_keys.into_authentic(id_keys)?;
let config = NoiseConfig::xx(noise_keys);
Ok(config.into_authenticated())
}
}
impl<P, C: Zeroize, R> UpgradeInfo for NoiseAuthenticated<P, C, R>
where
NoiseConfig<P, C, R>: UpgradeInfo,
{
type Info = <NoiseConfig<P, C, R> as UpgradeInfo>::Info;
type InfoIter = <NoiseConfig<P, C, R> as UpgradeInfo>::InfoIter;
fn protocol_info(&self) -> Self::InfoIter {
self.config.protocol_info()
}
}
impl<T, P, C, R> InboundUpgrade<T> for NoiseAuthenticated<P, C, R>
where
NoiseConfig<P, C, R>: UpgradeInfo
+ InboundUpgrade<T, Output = (RemoteIdentity<C>, NoiseOutput<T>), Error = NoiseError>
+ 'static,
<NoiseConfig<P, C, R> as InboundUpgrade<T>>::Future: Send,
T: AsyncRead + AsyncWrite + Send + 'static,
C: Protocol<C> + AsRef<[u8]> + Zeroize + Send + 'static,
{
type Output = (PeerId, NoiseOutput<T>);
type Error = NoiseError;
type Future = Pin<Box<dyn Future<Output = Result<Self::Output, Self::Error>> + Send>>;
fn upgrade_inbound(self, socket: T, info: Self::Info) -> Self::Future {
Box::pin(
self.config
.upgrade_inbound(socket, info)
.and_then(|(remote, io)| match remote {
RemoteIdentity::IdentityKey(pk) => future::ok((pk.to_peer_id(), io)),
_ => future::err(NoiseError::AuthenticationFailed),
}),
)
}
}
impl<T, P, C, R> OutboundUpgrade<T> for NoiseAuthenticated<P, C, R>
where
NoiseConfig<P, C, R>: UpgradeInfo
+ OutboundUpgrade<T, Output = (RemoteIdentity<C>, NoiseOutput<T>), Error = NoiseError>
+ 'static,
<NoiseConfig<P, C, R> as OutboundUpgrade<T>>::Future: Send,
T: AsyncRead + AsyncWrite + Send + 'static,
C: Protocol<C> + AsRef<[u8]> + Zeroize + Send + 'static,
{
type Output = (PeerId, NoiseOutput<T>);
type Error = NoiseError;
type Future = Pin<Box<dyn Future<Output = Result<Self::Output, Self::Error>> + Send>>;
fn upgrade_outbound(self, socket: T, info: Self::Info) -> Self::Future {
Box::pin(
self.config
.upgrade_outbound(socket, info)
.and_then(|(remote, io)| match remote {
RemoteIdentity::IdentityKey(pk) => future::ok((pk.to_peer_id(), io)),
_ => future::err(NoiseError::AuthenticationFailed),
}),
)
}
}
/// Legacy configuration options.
#[derive(Clone, Copy, Default)]
pub struct LegacyConfig {
/// Whether to continue sending legacy handshake payloads,
/// i.e. length-prefixed protobuf payloads inside a length-prefixed
/// noise frame. These payloads are not interoperable with other
/// libp2p implementations.
pub send_legacy_handshake: bool,
/// Whether to support receiving legacy handshake payloads,
/// i.e. length-prefixed protobuf payloads inside a length-prefixed
/// noise frame. These payloads are not interoperable with other
/// libp2p implementations.
pub recv_legacy_handshake: bool,
}