diff options
author | Aspen Smith <grfn@gws.fyi> | 2024-02-12T03·00-0500 |
---|---|---|
committer | clbot <clbot@tvl.fyi> | 2024-02-14T19·37+0000 |
commit | 82ecd61f5c699cf3af6c4eadf47a1c52b1d696c6 (patch) | |
tree | 429c5e078528000591742ec3211bc768ae913a78 /users/grfn/xanthous/server | |
parent | 0ba476a4266015f278f18d74094299de74a5a111 (diff) |
chore(users): grfn -> aspen r/7511
Change-Id: I6c6847fac56f0a9a1a2209792e00a3aec5e672b9 Reviewed-on: https://cl.tvl.fyi/c/depot/+/10809 Autosubmit: aspen <root@gws.fyi> Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI Reviewed-by: lukegb <lukegb@tvl.fyi>
Diffstat (limited to 'users/grfn/xanthous/server')
-rw-r--r-- | users/grfn/xanthous/server/.envrc | 1 | ||||
-rw-r--r-- | users/grfn/xanthous/server/.gitignore | 1 | ||||
-rw-r--r-- | users/grfn/xanthous/server/Cargo.lock | 1874 | ||||
-rw-r--r-- | users/grfn/xanthous/server/Cargo.toml | 29 | ||||
-rw-r--r-- | users/grfn/xanthous/server/default.nix | 24 | ||||
-rw-r--r-- | users/grfn/xanthous/server/docker.nix | 21 | ||||
-rw-r--r-- | users/grfn/xanthous/server/module.nix | 49 | ||||
-rw-r--r-- | users/grfn/xanthous/server/shell.nix | 11 | ||||
-rw-r--r-- | users/grfn/xanthous/server/src/main.rs | 385 | ||||
-rw-r--r-- | users/grfn/xanthous/server/src/metrics.rs | 24 | ||||
-rw-r--r-- | users/grfn/xanthous/server/src/pty.rs | 172 |
11 files changed, 0 insertions, 2591 deletions
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-[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/grfn/xanthous/server/default.nix b/users/grfn/xanthous/server/default.nix deleted file mode 100644 index 572230a56c5e..000000000000 --- a/users/grfn/xanthous/server/default.nix +++ /dev/null @@ -1,24 +0,0 @@ -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/grfn/xanthous/server/docker.nix b/users/grfn/xanthous/server/docker.nix deleted file mode 100644 index 09054cb00fcf..000000000000 --- a/users/grfn/xanthous/server/docker.nix +++ /dev/null @@ -1,21 +0,0 @@ -{ depot ? import ../../../.. { } -, pkgs ? depot.third_party.nixpkgs -, ... -}: - -let - inherit (depot.users.grfn) 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/grfn/xanthous/server/module.nix b/users/grfn/xanthous/server/module.nix deleted file mode 100644 index 82de6e38e1af..000000000000 --- a/users/grfn/xanthous/server/module.nix +++ /dev/null @@ -1,49 +0,0 @@ -{ 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.grfn.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/grfn/xanthous/server/shell.nix b/users/grfn/xanthous/server/shell.nix deleted file mode 100644 index e01c0316a6b2..000000000000 --- a/users/grfn/xanthous/server/shell.nix +++ /dev/null @@ -1,11 +0,0 @@ -let - depot = import ../../../.. { }; - pkgs = depot.third_party.nixpkgs; -in - -pkgs.mkShell { - buildInputs = with pkgs; [ - rustup - rust-analyzer - ]; -} diff --git a/users/grfn/xanthous/server/src/main.rs b/users/grfn/xanthous/server/src/main.rs deleted file mode 100644 index 1b2c1c104b33..000000000000 --- a/users/grfn/xanthous/server/src/main.rs +++ /dev/null @@ -1,385 +0,0 @@ -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/grfn/xanthous/server/src/metrics.rs b/users/grfn/xanthous/server/src/metrics.rs deleted file mode 100644 index 6912cdd9c9ee..000000000000 --- a/users/grfn/xanthous/server/src/metrics.rs +++ /dev/null @@ -1,24 +0,0 @@ -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/grfn/xanthous/server/src/pty.rs b/users/grfn/xanthous/server/src/pty.rs deleted file mode 100644 index 234ecd8f2336..000000000000 --- a/users/grfn/xanthous/server/src/pty.rs +++ /dev/null @@ -1,172 +0,0 @@ -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) - } -} |