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routing::post, - Json, Router, -}; -use serde::{Deserialize, Serialize}; -use tower_http::trace::TraceLayer; -use tower_http::cors::CorsLayer; -use tracing::info_span; -use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt}; - -mod sandbox; - -#[derive(Default, Debug, Clone, PartialEq, Deserialize)] -pub struct ExecRequest { - pub sandbox: String, - pub command: String, - pub files: HashMap, -} - -#[derive(Default, Debug, Clone, PartialEq, Serialize)] -pub struct ExecResponse { - pub id: String, - pub ok: bool, - pub duration: u64, - pub stdout: String, - pub stderr: String, -} - -async fn exec(Json(req): Json) -> (StatusCode, Json) { - let code = req.files.get("").unwrap(); - - let now = Instant::now(); - let output = sandbox::run_code(code); - - let duration = now.elapsed().as_millis() as u64; - let ok = output.status.success(); - let stdout = String::from_utf8_lossy(&output.stdout).to_string(); - let stderr = String::from_utf8_lossy(&output.stderr).to_string(); - - let resp = ExecResponse { - id: "random".to_string(), - ok, - duration, - stdout, - stderr, - }; - - (StatusCode::OK, Json(resp)) -} - -#[tokio::main] -async fn main() { - tracing_subscriber::registry() - .with( - tracing_subscriber::EnvFilter::try_from_default_env().unwrap_or_else(|_| { - // axum logs rejections from built-in extractors with the `axum::rejection` - // target, at `TRACE` level. `axum::rejection=trace` enables showing those events - "backend=debug,tower_http=debug,axum::rejection=trace".into() - }), - ) - .with(tracing_subscriber::fmt::layer()) - .init(); - - let app = Router::new().route("/v1/exec", post(exec)) - .layer(CorsLayer::permissive()) - .layer( - TraceLayer::new_for_http().make_span_with(|request: &Request<_>| { - let matched_path = request - .extensions() - .get::() - .map(MatchedPath::as_str); - - info_span!( - "http_request", - method = ?request.method(), - matched_path, - some_other_field = tracing::field::Empty, - ) - }), - ); - - let listener = tokio::net::TcpListener::bind("0.0.0.0:8080").await.unwrap(); - tracing::debug!("listening on {}", listener.local_addr().unwrap()); - axum::serve(listener, app).await.unwrap(); -} diff --git a/src/sandbox.rs b/src/sandbox.rs deleted file mode 100644 index ebcfe25..0000000 --- a/src/sandbox.rs +++ /dev/null @@ -1,136 +0,0 @@ -use std::fs::File; -use std::io::Write; -use std::process::Command; - -use tempfile::{TempDir, NamedTempFile}; - -#[rustfmt::skip] -const STATIC_ARGS: &[&str] = &[ - "--ro-bind", "/usr", "/usr", - "--dir", "/tmp", - "--dir", "/var", - "--symlink", "../tmp", "/var/tmp", - "--proc", "/proc", - "--dev", "/dev", - "--ro-bind", "/etc/resolv.conf", "/etc/resolv.conf", - "--symlink", "usr/lib", "/lib", - "--symlink", "usr/lib64", "/lib64", - "--symlink", "usr/bin", "/bin", - "--symlink", "usr/sbin", "/sbin", - "--unshare-all", - "--die-with-parent", - "--clearenv", - "--setenv", "PATH", "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", - "--setenv", "HAREPATH", "/usr/local/src/hare/stdlib", -]; - -const HARE_COMMAND: &str = "/usr/local/bin/hare"; - -/// Default command timeout in seconds. -const DEFAULT_TIMEOUT: u32 = 30; - -fn passwd_files(uid: u32, gid: u32) -> (NamedTempFile, NamedTempFile, Vec) { - let uid = uid.to_string(); - let passwd = Command::new("getent") - .args(["passwd", &uid, "65534"]) - .output() - .expect("failed to run getent passwd"); - - let gid = gid.to_string(); - let group = Command::new("getent") - .args(["group", &gid, "65534"]) - .output() - .expect("failed to run getent passwd"); - - let mut passwd_file = tempfile::NamedTempFile::new().unwrap(); - passwd_file.write_all(&passwd.stdout).unwrap(); - passwd_file.flush().unwrap(); - - let mut group_file = tempfile::NamedTempFile::new().unwrap(); - group_file.write_all(&group.stdout).unwrap(); - group_file.flush().unwrap(); - - let args = vec![ - "--ro-bind".to_string(), - passwd_file.path().display().to_string(), - "/etc/passwd".to_string(), - "--ro-bind".to_string(), - group_file.path().display().to_string(), - "/etc/group".to_string(), - ]; - - (passwd_file, group_file, args) -} - -fn home_dir(uid: u32) -> Vec { - let user_dir = format!("/run/user/{uid}"); - let home_dir = format!("{user_dir}/home"); - - vec![ - "--dir".to_string(), - home_dir.clone(), - "--setenv".to_string(), - "HOME".to_string(), - home_dir, - "--setenv".to_string(), - "XDG_RUNTIME_DIR".to_string(), - user_dir, - ] -} - -fn shared_app_dir() -> (TempDir, Vec) { - let tmp_app_dir = tempfile::tempdir().unwrap(); - let app_dir_path = tmp_app_dir.path().display().to_string(); - - ( - tmp_app_dir, - vec![ - "--bind".to_string(), - app_dir_path, - "/app".to_string(), - "--chdir".to_string(), - "/app".to_string(), - ], - ) -} - -fn command(app_file: &str) -> Vec { - vec![ - "/usr/bin/timeout".to_string(), DEFAULT_TIMEOUT.to_string(), - HARE_COMMAND.to_string(), - "run".to_string(), - app_file.to_string(), - ] -} - -fn getids() -> (u32, u32) { - unsafe { (libc::getuid(), libc::getgid()) } -} - -pub fn run_code(code: &str) -> std::process::Output { - let (uid, gid) = getids(); - - let mut bwrap_cmd = Command::new("bwrap"); - bwrap_cmd.args(STATIC_ARGS); - - let (app_dir, dir_arg) = shared_app_dir(); - bwrap_cmd.args(dir_arg); - - let home_args = home_dir(uid); - bwrap_cmd.args(home_args); - - let (_passwd, _group, file_args) = passwd_files(uid, gid); - bwrap_cmd.args(file_args); - - { - let code_path = app_dir.path().join("main.ha"); - let mut code_file = File::create(code_path).unwrap(); - code_file.write_all(code.as_bytes()).unwrap(); - } - - let cmd_args = command("/app/main.ha"); - bwrap_cmd.args(cmd_args); - - let output = bwrap_cmd.output().expect("running bwrap failed"); - output -}