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"keyforkd", "keyfork-frame" ] diff --git a/keyforkd/Cargo.toml b/keyforkd/Cargo.toml new file mode 100644 index 0000000..86f46bb --- /dev/null +++ b/keyforkd/Cargo.toml @@ -0,0 +1,23 @@ +[package] +name = "keyforkd" +version = "0.1.0" +edition = "2021" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[features] +default = ["tracing", "multithread"] +tracing = ["tower/tracing", "tokio/tracing", "dep:tracing", "dep:tracing-subscriber", "dep:tracing-error"] +multithread = ["tokio/rt-multi-thread"] + +[dependencies] +dirs = "5.0.1" +keyfork-frame = { version = "0.1.0", path = "../keyfork-frame" } +keyfork-mnemonic-util = { version = "0.1.0", path = "../keyfork-mnemonic-util" } +minicbor = { version = "0.19.1", features = ["derive", "std"] } +thiserror = "1.0.47" +tokio = { version = "1.32.0", features = ["io-util", "macros", "rt", "io-std", "net", "fs", "signal"] } +tower = { version = "0.4.13", features = ["tokio", "util"] } +tracing = { version = "0.1.37", optional = true } +tracing-error = { version = "0.2.0", optional = true } +tracing-subscriber = { version = "0.3.17", optional = true, features = ["env-filter"] } diff --git a/keyforkd/src/error.rs b/keyforkd/src/error.rs new file mode 100644 index 0000000..08bbe4f --- /dev/null +++ b/keyforkd/src/error.rs @@ -0,0 +1,7 @@ +use thiserror::Error; + +#[derive(Debug, Clone, Error)] +pub(crate) enum KeycloakdError { + #[error("No runtime directory found from dirs::runtime_dir()")] + NoRuntimeDir, +} diff --git a/keyforkd/src/main.rs b/keyforkd/src/main.rs new file mode 100644 index 0000000..b7f17c5 --- /dev/null +++ b/keyforkd/src/main.rs @@ -0,0 +1,72 @@ +use keyfork_mnemonic_util::Mnemonic; + +use tokio::io::{self, AsyncBufReadExt, BufReader}; + +#[cfg(feature = "tracing")] +use tracing::debug; +#[cfg(feature = "tracing")] +use tracing_subscriber::{ + filter::{EnvFilter, LevelFilter}, + fmt::{format::FmtSpan, layer}, + prelude::*, + registry, +}; + +mod error; +mod service; +mod server; +use error::KeycloakdError; +use service::Keyforkd; +use server::UnixServer; + +type Result> = std::result::Result; + +async fn load_mnemonic() -> Result { + let mut stdin = BufReader::new(io::stdin()); + let mut line = String::new(); + stdin.read_line(&mut line).await?; + Ok(line.parse()?) +} + +#[cfg(feature = "tracing")] +fn setup_registry() { + let envfilter = EnvFilter::builder() + .with_default_directive(LevelFilter::DEBUG.into()) + .from_env_lossy(); + registry() + .with(envfilter) + .with(layer().with_span_events(FmtSpan::CLOSE)) + .with(tracing_error::ErrorLayer::default()) + .init(); +} + +#[cfg_attr(feature = "multithread", tokio::main)] +#[cfg_attr(not(feature = "multithread"), tokio::main(flavor = "current_thread"))] +async fn main() -> Result<(), Box> { + #[cfg(feature = "tracing")] + setup_registry(); + + #[cfg(feature = "tracing")] + debug!("reading mnemonic from standard input"); + let mnemonic = load_mnemonic().await?; + + let service = Keyforkd::new(mnemonic); + + let mut runtime_dir = dirs::runtime_dir().ok_or(KeycloakdError::NoRuntimeDir)?; + runtime_dir.push("keyforkd"); + #[cfg(feature = "tracing")] + debug!("ensuring directory exists: {}", runtime_dir.display()); + if !runtime_dir.is_dir() { + tokio::fs::create_dir(&runtime_dir).await?; + } + runtime_dir.push("keyforkd.sock"); + #[cfg(feature = "tracing")] + debug!( + "binding UNIX socket in runtime dir: {}", + runtime_dir.display() + ); + + let mut server = UnixServer::bind(&runtime_dir)?; + let _ = server.run(service).await; + Ok(()) +} diff --git a/keyforkd/src/server.rs b/keyforkd/src/server.rs new file mode 100644 index 0000000..6b8c56d --- /dev/null +++ b/keyforkd/src/server.rs @@ -0,0 +1,93 @@ +use crate::service::{DerivablePath, DerivationError, Keyforkd}; +use keyfork_frame::asyncext::{try_decode_from, try_encode_to}; +use std::{io::Error, path::{Path, PathBuf}}; +use tokio::net::{UnixListener, UnixStream}; +use tower::{Service, ServiceExt}; + +#[cfg(feature = "tracing")] +use tracing::debug; + +async fn read_path_from_socket( + socket: &mut UnixStream, +) -> Result> { + let data = try_decode_from(socket).await.unwrap(); + let path: DerivablePath = minicbor::decode(&data[..]).unwrap(); + Ok(path) +} + +async fn wait_and_run(app: &mut Keyforkd, path: DerivablePath) -> Result, DerivationError> { + app.ready().await?.call(path).await +} + +#[allow(clippy::module_name_repetitions)] +pub struct UnixServer { + listener: UnixListener, +} + +impl UnixServer { + pub fn bind(address: impl AsRef) -> Result { + let mut path = PathBuf::new(); + path.extend(address.as_ref().components()); + tokio::spawn(async move { + let result = tokio::signal::ctrl_c().await; + #[cfg(feature = "tracing")] + debug!(?result, "encountered ctrl-c, performing cleanup and exiting"); + let result = tokio::fs::remove_file(&path).await; + #[cfg(feature = "tracing")] + if let Err(error) = result { + debug!(%error, "unable to remove path: {}", path.display()); + } + std::process::exit(0x80); + }); + + Ok(Self { + listener: UnixListener::bind(address)?, + }) + } + + pub async fn run(&mut self, app: Keyforkd) -> Result<(), Box> { + loop { + let mut app = app.clone(); + let (mut socket, _) = self.listener.accept().await?; + #[cfg(feature = "tracing")] + debug!("new socket connected"); + tokio::spawn(async move { + let path = match read_path_from_socket(&mut socket).await { + Ok(path) => path, + Err(e) => { + #[cfg(feature = "tracing")] + debug!(%e, "Error reading DerivablePath from socket"); + let content = e.to_string().bytes().collect::>(); + let result = try_encode_to(&content[..], &mut socket).await; + #[cfg(feature = "tracing")] + if let Err(error) = result { + debug!(%error, "Error sending error to client"); + } + return; + } + }; + + let response = match wait_and_run(&mut app, path).await { + Ok(response) => response, + Err(e) => { + #[cfg(feature = "tracing")] + debug!(%e, "Error reading DerivablePath from socket"); + let content = e.to_string().bytes().collect::>(); + let result = try_encode_to(&content[..], &mut socket).await; + #[cfg(feature = "tracing")] + if let Err(error) = result { + debug!(%error, "Error sending error to client"); + } + return; + } + }; + + if let Err(e) = try_encode_to(&response[..], &mut socket).await { + #[cfg(feature = "tracing")] + debug!(%e, "Error sending response to client"); + } + + }); + } + } +} diff --git a/keyforkd/src/service.rs b/keyforkd/src/service.rs new file mode 100644 index 0000000..7aaf81d --- /dev/null +++ b/keyforkd/src/service.rs @@ -0,0 +1,66 @@ +use std::{future::Future, pin::Pin, task::Poll, sync::Arc}; + +use keyfork_mnemonic_util::Mnemonic; +use minicbor::{Decode, Encode}; +use tower::Service; +use thiserror::Error; + +#[derive(Encode, Decode, Clone, Debug)] +pub struct DerivablePath { + #[n(0)] + path: Vec>, +} + +// TODO: move DerivablePath into a models crate for clients to produce? +/* +impl DerivablePath { + pub fn new(input: &[&[u8]]) -> DerivablePath { + DerivablePath { + path: input + .iter() + .map(|&word| { + // perform path validation + word.to_vec() + }) + .collect(), + } + } +} +*/ + +#[derive(Clone, Debug)] +pub struct Keyforkd { + mnemonic: Arc, +} + +// Currently, this can't be instantiated, therefore it is a never-type +#[derive(Debug, Error)] +pub enum DerivationError { +} + +impl Keyforkd { + pub fn new(mnemonic: Mnemonic) -> Self { + Self { mnemonic: Arc::new(mnemonic) } + } +} + +impl Service for Keyforkd { + type Response = Vec; + + type Error = DerivationError; + + type Future = Pin> + Send>>; + + fn poll_ready( + &mut self, + _cx: &mut std::task::Context<'_>, + ) -> std::task::Poll> { + Poll::Ready(Ok(())) + } + + #[cfg_attr(feature = "tracing", tracing::instrument(skip(self)))] + fn call(&mut self, req: DerivablePath) -> Self::Future { + dbg!(&req, &self.mnemonic); + Box::pin(async { Ok(vec![]) }) + } +}