diff options
Diffstat (limited to 'users/aspen/xanthous/server')
| -rw-r--r-- | users/aspen/xanthous/server/.envrc | 1 | ||||
| -rw-r--r-- | users/aspen/xanthous/server/.gitignore | 1 | ||||
| -rw-r--r-- | users/aspen/xanthous/server/Cargo.lock | 1874 | ||||
| -rw-r--r-- | users/aspen/xanthous/server/Cargo.toml | 29 | ||||
| -rw-r--r-- | users/aspen/xanthous/server/default.nix | 24 | ||||
| -rw-r--r-- | users/aspen/xanthous/server/docker.nix | 21 | ||||
| -rw-r--r-- | users/aspen/xanthous/server/module.nix | 49 | ||||
| -rw-r--r-- | users/aspen/xanthous/server/shell.nix | 11 | ||||
| -rw-r--r-- | users/aspen/xanthous/server/src/main.rs | 385 | ||||
| -rw-r--r-- | users/aspen/xanthous/server/src/metrics.rs | 24 | ||||
| -rw-r--r-- | users/aspen/xanthous/server/src/pty.rs | 172 |
11 files changed, 2591 insertions, 0 deletions
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"registry+https://github.com/rust-lang/crates.io-index" +checksum = "4756f7db3f7b5574938c3eb1c117038b8e07f95ee6718c0efad4ac21508f1efd" diff --git a/users/aspen/xanthous/server/Cargo.toml b/users/aspen/xanthous/server/Cargo.toml new file mode 100644 index 0000000000..d4a064beb6 --- /dev/null +++ b/users/aspen/xanthous/server/Cargo.toml @@ -0,0 +1,29 @@ +[package] +name = "xanthous-server" +version = "0.1.0" +edition = "2018" + +[dependencies] +clap = { version = "3.0", features = [ "derive", "env" ] } +color-eyre = "0.5.11" +eyre = "0.6.5" +thrussh = "0.33.5" +thrussh-keys = "0.21.0" +tracing = "0.1.29" +tracing-subscriber = "0.2.25" +metrics = "0.17.0" +metrics-exporter-prometheus = "0.6.1" +futures = "0.3.17" +libc = "0.2.103" +nix = "0.23.0" + +# Pins for rust 1.55 (2018 edition) until we have 1.56 in nixpkgs-unstable +pbkdf2 = "<0.9" +base64ct = "<1.2" + +[dependencies.tokio] +version = "1.13" +features = ["rt", "rt-multi-thread", "macros", "net", "process", "fs", "signal"] + +[dev-dependencies] +tempfile = "3.2.0" diff --git a/users/aspen/xanthous/server/default.nix b/users/aspen/xanthous/server/default.nix new file mode 100644 index 0000000000..572230a56c --- /dev/null +++ b/users/aspen/xanthous/server/default.nix @@ -0,0 +1,24 @@ +args@{ depot ? import ../../../.. { } +, pkgs ? depot.third_party.nixpkgs +, ... +}: + +depot.third_party.naersk.buildPackage { + name = "xanthous-server"; + version = "0.0.1"; + src = depot.third_party.gitignoreSource ./.; + + # Workaround for a potential Nix bug related to restricted eval. + # See https://github.com/nix-community/naersk/issues/169 + root = depot.nix.sparseTree { + root = ./.; + paths = [ + ./Cargo.toml + ./Cargo.lock + ]; + }; + + passthru = { + docker = import ./docker.nix args; + }; +} diff --git a/users/aspen/xanthous/server/docker.nix b/users/aspen/xanthous/server/docker.nix new file mode 100644 index 0000000000..5eaef4553b --- /dev/null +++ b/users/aspen/xanthous/server/docker.nix @@ -0,0 +1,21 @@ +{ depot ? import ../../../.. { } +, pkgs ? depot.third_party.nixpkgs +, ... +}: + +let + inherit (depot.users.aspen) xanthous; + xanthous-server = xanthous.server; +in +pkgs.dockerTools.buildLayeredImage { + name = "xanthous-server"; + tag = "latest"; + contents = [ xanthous xanthous-server ]; + config = { + Cmd = [ + "${xanthous-server}/bin/xanthous-server" + "--xanthous-binary-path" + "${xanthous}/bin/xanthous" + ]; + }; +} diff --git a/users/aspen/xanthous/server/module.nix b/users/aspen/xanthous/server/module.nix new file mode 100644 index 0000000000..6d1bdc6873 --- /dev/null +++ b/users/aspen/xanthous/server/module.nix @@ -0,0 +1,49 @@ +{ config, lib, pkgs, depot, ... }: + +let + cfg = config.services.xanthous-server; +in +{ + options = with lib; { + services.xanthous-server = { + enable = mkEnableOption "xanthous server"; + + port = mkOption { + type = types.int; + default = 2222; + description = "Port to listen to for SSH connections"; + }; + + metricsPort = mkOption { + type = types.int; + default = 9000; + description = "Port to listen to for prometheus metrics"; + }; + + image = mkOption { + type = types.package; + default = depot.users.aspen.xanthous.server.docker; + description = "OCI image file to run"; + }; + + ed25519SecretKeyFile = mkOption { + type = with types; uniq string; + description = "Path to the ed25519 secret key for the server"; + }; + }; + }; + + config = lib.mkIf cfg.enable { + virtualisation.oci-containers.containers."xanthous-server" = { + autoStart = true; + image = "${cfg.image.imageName}:${cfg.image.imageTag}"; + imageFile = cfg.image; + ports = [ + "${toString cfg.port}:22" + "${toString cfg.metricsPort}:9000" + ]; + environment.SECRET_KEY_FILE = "/secret-key"; + volumes = [ "/etc/secrets/xanthous-server-secret-key:/secret-key" ]; + }; + }; +} diff --git a/users/aspen/xanthous/server/shell.nix b/users/aspen/xanthous/server/shell.nix new file mode 100644 index 0000000000..e01c0316a6 --- /dev/null +++ b/users/aspen/xanthous/server/shell.nix @@ -0,0 +1,11 @@ +let + depot = import ../../../.. { }; + pkgs = depot.third_party.nixpkgs; +in + +pkgs.mkShell { + buildInputs = with pkgs; [ + rustup + rust-analyzer + ]; +} diff --git a/users/aspen/xanthous/server/src/main.rs b/users/aspen/xanthous/server/src/main.rs new file mode 100644 index 0000000000..1b2c1c104b --- /dev/null +++ b/users/aspen/xanthous/server/src/main.rs @@ -0,0 +1,385 @@ +use std::net::SocketAddr; +use std::path::PathBuf; +use std::pin::Pin; +use std::process::Command; +use std::str; +use std::sync::Arc; + +use clap::Parser; +use color_eyre::eyre::Result; +use eyre::{bail, Context}; +use futures::future::{ready, Ready}; +use futures::Future; +use metrics_exporter_prometheus::PrometheusBuilder; +use nix::pty::Winsize; +use pty::ChildHandle; +use thrussh::server::{self, Auth, Session}; +use thrussh::{ChannelId, CryptoVec}; +use thrussh_keys::decode_secret_key; +use thrussh_keys::key::KeyPair; +use tokio::fs::File; +use tokio::io::{AsyncReadExt, AsyncWriteExt}; +use tokio::net::TcpListener; +use tokio::select; +use tokio::time::Instant; +use tracing::{debug, error, info, info_span, trace, warn, Instrument}; +use tracing_subscriber::EnvFilter; + +use crate::pty::WaitPid; + +mod metrics; +mod pty; + +use crate::metrics::reported::*; +use crate::metrics::{decrement_gauge, histogram, increment_counter, increment_gauge}; + +/// SSH-compatible server for playing Xanthous +#[derive(Parser, Debug)] +struct Opts { + /// Address to bind to + #[clap(long, short = 'a', default_value = "0.0.0.0:22")] + address: String, + + /// Address to listen to for metrics + #[clap(long, default_value = "0.0.0.0:9000")] + metrics_address: SocketAddr, + + /// Format to use when emitting log events + #[clap( + long, + env = "LOG_FORMAT", + default_value = "full", + possible_values = &["compact", "full", "pretty", "json"] + )] + log_format: String, + + /// Full path to the xanthous binary + #[clap(long, env = "XANTHOUS_BINARY_PATH")] + xanthous_binary_path: String, + + /// Path to a file containing the ed25519 secret key for the server + #[clap(long, env = "SECRET_KEY_FILE")] + secret_key_file: PathBuf, + + /// Level to log at + #[clap(long, env = "LOG_LEVEL", default_value = "info")] + log_level: String, +} + +impl Opts { + async fn read_secret_key(&self) -> Result<KeyPair> { + let mut file = File::open(&self.secret_key_file) + .await + .context("Reading secret key file")?; + let mut secret_key = Vec::with_capacity(464); + file.read_to_end(&mut secret_key).await?; + Ok(decode_secret_key(str::from_utf8(&secret_key)?, None)?) + } + + async fn ssh_server_config(&self) -> Result<server::Config> { + let key_pair = self.read_secret_key().await?; + + Ok(server::Config { + server_id: "SSH-2.0-xanthous".to_owned(), + keys: vec![key_pair], + ..Default::default() + }) + } + + fn init_logging(&self) -> Result<()> { + let filter = EnvFilter::try_new(&self.log_level)?; + let s = tracing_subscriber::fmt().with_env_filter(filter); + + match self.log_format.as_str() { + "compact" => s.compact().init(), + "full" => s.init(), + "pretty" => s.pretty().init(), + "json" => s.json().with_current_span(true).init(), + f => bail!("Invalid log format `{}`", f), + } + + Ok(()) + } +} + +struct Handler { + address: SocketAddr, + xanthous_binary_path: &'static str, + username: Option<String>, + child: Option<ChildHandle>, +} + +async fn run_child( + mut child: pty::Child, + mut server_handle: server::Handle, + channel_id: ChannelId, +) -> Result<()> { + let mut buf = [0; 2048]; + loop { + select! { + r = child.tty.read(&mut buf) => { + let read_bytes = r?; + if read_bytes == 0 { + info!("EOF received from process"); + let _ = server_handle.close(channel_id).await; + return Ok(()) + } else { + trace!(?read_bytes, "read bytes from child"); + let _ = server_handle.data(channel_id, CryptoVec::from_slice(&buf[..read_bytes])).await; + } + } + status = WaitPid::new(child.pid) => { + match status { + Ok(_status) => info!("Child exited"), + Err(error) => error!(%error, "Child failed"), + } + let _ = server_handle.close(channel_id).await; + return Ok(()) + } + } + } +} + +impl Handler { + async fn spawn_shell( + &mut self, + mut handle: server::Handle, + channel_id: ChannelId, + term: String, + winsize: Winsize, + ) -> Result<()> { + let mut cmd = Command::new(self.xanthous_binary_path); + cmd.env("TERM", term); + if let Some(username) = &self.username { + cmd.args(["--name", username]); + } + cmd.arg("--disable-saving"); + + let child = pty::spawn(cmd, Some(winsize), None).await?; + info!(pid = %child.pid, "Spawned child"); + increment_gauge!(RUNNING_PROCESSES, 1.0); + self.child = Some(child.handle().await?); + tokio::spawn( + async move { + let span = info_span!("child", pid = %child.pid); + if let Err(error) = run_child(child, handle.clone(), channel_id) + .instrument(span.clone()) + .await + { + span.in_scope(|| error!(%error, "Error running child")); + let _ = handle.close(channel_id).await; + } + decrement_gauge!(RUNNING_PROCESSES, 1.0); + } + .in_current_span(), + ); + Ok(()) + } +} + +#[allow(clippy::type_complexity)] +impl server::Handler for Handler { + type Error = eyre::Error; + type FutureAuth = Ready<Result<(Self, Auth)>>; + type FutureUnit = Pin<Box<dyn Future<Output = Result<(Self, Session)>> + Send + 'static>>; + type FutureBool = Ready<Result<(Self, Session, bool)>>; + + fn finished_auth(self, auth: Auth) -> Self::FutureAuth { + ready(Ok((self, auth))) + } + + fn finished_bool(self, b: bool, session: Session) -> Self::FutureBool { + ready(Ok((self, session, b))) + } + + fn finished(self, session: Session) -> Self::FutureUnit { + Box::pin(ready(Ok((self, session)))) + } + + fn auth_none(mut self, username: &str) -> Self::FutureAuth { + info!(%username, "Accepted new connection"); + self.username = Some(username.to_owned()); + self.finished_auth(Auth::Accept) + } + + fn auth_password(mut self, username: &str, _password: &str) -> Self::FutureAuth { + info!(%username, "Accepted new connection"); + self.username = Some(username.to_owned()); + self.finished_auth(Auth::Accept) + } + + fn auth_publickey( + mut self, + username: &str, + _: &thrussh_keys::key::PublicKey, + ) -> Self::FutureAuth { + info!(%username, "Accepted new connection"); + self.username = Some(username.to_owned()); + self.finished_auth(Auth::Accept) + } + + fn pty_request( + mut self, + channel: thrussh::ChannelId, + term: &str, + col_width: u32, + row_height: u32, + pix_width: u32, + pix_height: u32, + modes: &[(thrussh::Pty, u32)], + session: Session, + ) -> Self::FutureUnit { + let term = term.to_owned(); + let modes = modes.to_vec(); + Box::pin(async move { + debug!( + %term, + %col_width, + %row_height, + %pix_width, + %pix_height, + ?modes, + "PTY Requested" + ); + + self.spawn_shell( + session.handle(), + channel, + term, + Winsize { + ws_row: row_height as _, + ws_col: col_width as _, + ws_xpixel: pix_width as _, + ws_ypixel: pix_height as _, + }, + ) + .await?; + + Ok((self, session)) + }) + } + + fn window_change_request( + mut self, + _channel: ChannelId, + col_width: u32, + row_height: u32, + pix_width: u32, + pix_height: u32, + session: Session, + ) -> Self::FutureUnit { + Box::pin(async move { + if let Some(child) = self.child.as_mut() { + trace!(%row_height, %col_width, "Window resize request received"); + child + .resize_window(Winsize { + ws_row: row_height as _, + ws_col: col_width as _, + ws_xpixel: pix_width as _, + ws_ypixel: pix_height as _, + }) + .await?; + } else { + warn!("Resize request received without child process; ignoring"); + } + + Ok((self, session)) + }) + } + + fn data( + mut self, + _channel: thrussh::ChannelId, + data: &[u8], + session: Session, + ) -> Self::FutureUnit { + trace!(data = %String::from_utf8_lossy(data), raw_data = ?data); + let data = data.to_owned(); + Box::pin(async move { + if let Some(child) = self.child.as_mut() { + child.write_all(&data).await?; + } else { + warn!("Data received without child process; ignoring"); + } + + Ok((self, session)) + }) + } +} + +#[tokio::main] +async fn main() -> Result<()> { + color_eyre::install()?; + let opts = Box::leak::<'static>(Box::new(Opts::parse())); + opts.init_logging()?; + PrometheusBuilder::new() + .listen_address(opts.metrics_address) + .install()?; + metrics::register(); + + let config = Arc::new(opts.ssh_server_config().await?); + info!(address = %opts.address, "Listening for new SSH connections"); + let listener = TcpListener::bind(&opts.address).await?; + + loop { + let (stream, address) = listener.accept().await?; + increment_counter!(CONNECTIONS_ACCEPTED); + increment_gauge!(ACTIVE_CONNECTIONS, 1.0); + let config = config.clone(); + let handler = Handler { + xanthous_binary_path: &opts.xanthous_binary_path, + address, + username: None, + child: None, + }; + tokio::spawn(async move { + let span = info_span!("client", address = %handler.address); + let start = Instant::now(); + if let Err(error) = server::run_stream(config, stream, handler) + .instrument(span.clone()) + .await + { + span.in_scope(|| error!(%error)); + } + let duration = start.elapsed(); + span.in_scope(|| info!(duration_ms = %duration.as_millis(), "Client disconnected")); + histogram!(CONNECTION_DURATION, duration); + decrement_gauge!(ACTIVE_CONNECTIONS, 1.0); + }); + } +} + +#[cfg(test)] +mod tests { + use tempfile::NamedTempFile; + + use super::*; + + #[tokio::test] + async fn read_secret_key() { + use std::io::Write; + + let mut file = NamedTempFile::new().unwrap(); + file.write_all( + b" +-----BEGIN OPENSSH PRIVATE KEY----- +b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW +QyNTUxOQAAACAYz80xcK7jYxZMAl6apIHKRtB0Z2U78gG39c1QaIhgMwAAAJB9vxK9fb8S +vQAAAAtzc2gtZWQyNTUxOQAAACAYz80xcK7jYxZMAl6apIHKRtB0Z2U78gG39c1QaIhgMw +AAAEDNZ0d3lLNBGU6Im4JOpr490TOjm+cB7kMVXjVg3iCowBjPzTFwruNjFkwCXpqkgcpG +0HRnZTvyAbf1zVBoiGAzAAAACHRlc3Qta2V5AQIDBAU= +-----END OPENSSH PRIVATE KEY----- +", + ) + .unwrap(); + + let opts: Opts = Opts::parse_from(&[ + "xanthous-server".as_ref(), + "--xanthous-binary-path".as_ref(), + "/bin/xanthous".as_ref(), + "--secret-key-file".as_ref(), + file.path().as_os_str(), + ]); + opts.read_secret_key().await.unwrap(); + } +} diff --git a/users/aspen/xanthous/server/src/metrics.rs b/users/aspen/xanthous/server/src/metrics.rs new file mode 100644 index 0000000000..6912cdd9c9 --- /dev/null +++ b/users/aspen/xanthous/server/src/metrics.rs @@ -0,0 +1,24 @@ +pub use ::metrics::*; + +pub mod reported { + /// Counter: Connections accepted on the TCP listener + pub const CONNECTIONS_ACCEPTED: &str = "ssh.connections.accepted"; + + /// Histogram: Connection duration + pub const CONNECTION_DURATION: &str = "ssh.connections.duration"; + + /// Gauge: Currently active connections + pub const ACTIVE_CONNECTIONS: &str = "ssh.connections.active"; + + /// Gauge: Currently running xanthous processes + pub const RUNNING_PROCESSES: &str = "ssh.child.processes"; +} + +pub fn register() { + use reported::*; + + register_counter!(CONNECTIONS_ACCEPTED); + register_histogram!(CONNECTION_DURATION); + register_gauge!(ACTIVE_CONNECTIONS); + register_gauge!(RUNNING_PROCESSES); +} diff --git a/users/aspen/xanthous/server/src/pty.rs b/users/aspen/xanthous/server/src/pty.rs new file mode 100644 index 0000000000..234ecd8f23 --- /dev/null +++ b/users/aspen/xanthous/server/src/pty.rs @@ -0,0 +1,172 @@ +use std::io::{self}; +use std::os::unix::prelude::{AsRawFd, CommandExt, FromRawFd}; +use std::pin::Pin; +use std::process::{abort, Command}; +use std::task::{Context, Poll}; + +use eyre::{bail, Result}; +use futures::Future; +use nix::pty::{forkpty, Winsize}; +use nix::sys::termios::Termios; +use nix::sys::wait::{waitpid, WaitPidFlag, WaitStatus}; +use nix::unistd::{ForkResult, Pid}; +use tokio::fs::File; +use tokio::io::{AsyncRead, AsyncWrite}; +use tokio::signal::unix::{signal, Signal, SignalKind}; +use tokio::task::spawn_blocking; + +mod ioctl { + use super::Winsize; + use libc::TIOCSWINSZ; + use nix::ioctl_write_ptr_bad; + + ioctl_write_ptr_bad!(tiocswinsz, TIOCSWINSZ, Winsize); +} + +async fn asyncify<F, T>(f: F) -> Result<T> +where + F: FnOnce() -> Result<T> + Send + 'static, + T: Send + 'static, +{ + match spawn_blocking(f).await { + Ok(res) => res, + Err(_) => bail!("background task failed",), + } +} + +pub struct Child { + pub tty: File, + pub pid: Pid, +} + +pub struct ChildHandle { + pub tty: File, +} + +pub struct WaitPid { + pid: Pid, + signal: Signal, +} + +impl WaitPid { + pub fn new(pid: Pid) -> Self { + Self { + pid, + signal: signal(SignalKind::child()).unwrap(), + } + } +} + +impl Future for WaitPid { + type Output = nix::Result<WaitStatus>; + + fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { + let _ = self.signal.poll_recv(cx); + match waitpid(self.pid, Some(WaitPidFlag::WNOHANG)) { + Ok(WaitStatus::StillAlive) => Poll::Pending, + result => Poll::Ready(result), + } + } +} + +impl Child { + pub async fn handle(&self) -> io::Result<ChildHandle> { + Ok(ChildHandle { + tty: self.tty.try_clone().await?, + }) + } +} + +impl ChildHandle { + pub async fn resize_window(&mut self, winsize: Winsize) -> Result<()> { + let fd = self.tty.as_raw_fd(); + asyncify(move || unsafe { + ioctl::tiocswinsz(fd, &winsize as *const Winsize)?; + Ok(()) + }) + .await + } +} + +pub async fn spawn( + mut cmd: Command, + winsize: Option<Winsize>, + termios: Option<Termios>, +) -> Result<Child> { + asyncify(move || unsafe { + let res = forkpty(winsize.as_ref(), termios.as_ref())?; + match res.fork_result { + ForkResult::Parent { child } => Ok(Child { + pid: child, + tty: File::from_raw_fd(res.master), + }), + ForkResult::Child => { + cmd.exec(); + abort(); + } + } + }) + .await +} + +impl AsyncRead for Child { + fn poll_read( + mut self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &mut tokio::io::ReadBuf<'_>, + ) -> Poll<io::Result<()>> { + Pin::new(&mut self.tty).poll_read(cx, buf) + } +} + +impl AsyncWrite for Child { + fn poll_write( + mut self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &[u8], + ) -> Poll<Result<usize, io::Error>> { + Pin::new(&mut self.tty).poll_write(cx, buf) + } + + fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), io::Error>> { + Pin::new(&mut self.tty).poll_flush(cx) + } + + fn poll_shutdown( + mut self: Pin<&mut Self>, + cx: &mut Context<'_>, + ) -> Poll<Result<(), io::Error>> { + Pin::new(&mut self.tty).poll_shutdown(cx) + } +} + +impl AsyncRead for ChildHandle { + fn poll_read( + mut self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &mut tokio::io::ReadBuf<'_>, + ) -> Poll<io::Result<()>> { + Pin::new(&mut self.tty).poll_read(cx, buf) + } +} + +impl AsyncWrite for ChildHandle { + fn poll_write( + mut self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &[u8], + ) -> Poll<Result<usize, io::Error>> { + Pin::new(&mut self.tty).poll_write(cx, buf) + } + + fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), io::Error>> { + Pin::new(&mut self.tty).poll_flush(cx) + } + + fn poll_shutdown( + mut self: Pin<&mut Self>, + cx: &mut Context<'_>, + ) -> Poll<Result<(), io::Error>> { + Pin::new(&mut self.tty).poll_shutdown(cx) + } +} |