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"1.0.202", features = ["derive"] } +tempfile = "3.10.1" +tokio = { version = "1.37.0", features = ["rt-multi-thread"] } +tower-http = { version = "0.5.2", features = ["trace"] } +tracing = "0.1.40" +tracing-subscriber = { version = "0.3.18", features = ["env-filter"] } diff --git a/backend/src/main.rs b/backend/src/main.rs new file mode 100644 index 0000000..7666cf4 --- /dev/null +++ b/backend/src/main.rs @@ -0,0 +1,96 @@ +mod sandbox; + +/* +use std::collections::HashMap; +use axum::{ + extract::MatchedPath, + http::{Request, StatusCode}, + routing::post, + Json, Router, +}; +use serde::{Deserialize, Serialize}; +use tower_http::trace::TraceLayer; +use tracing::info_span; +use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt}; + +#[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: i64, + pub stdout: String, + pub stderr: String, +} + +async fn exec(Json(req): Json) -> (StatusCode, Json) { + let resp = ExecResponse { + id: "random".to_string(), + ok: true, + duration: 10, + stdout: "none".to_string(), + stderr: "".to_string(), + }; + + (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( + 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(); +} +*/ + +fn main() { + sandbox::run_code(r#" +use fmt; + +export fn main() void = { + const greetings = [ + "Hello, world!", + "¡Hola Mundo!", + "Γειά σου Κόσμε!", + "Привіт, світ!", + "こんにちは世界!", + ]; + for (let i = 0z; i < len(greetings); i+= 1) { + fmt::println(greetings[i])!; + }; +}; + "#); +} diff --git a/backend/src/sandbox.rs b/backend/src/sandbox.rs new file mode 100644 index 0000000..2cbb176 --- /dev/null +++ b/backend/src/sandbox.rs @@ -0,0 +1,131 @@ +use std::fs::File; +use std::io::Write; +use std::os::fd::AsRawFd; +use std::process::Command; + +use tempfile::TempDir; + +#[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", + "--ro-bind", "/nix", "/nix", + "--symlink", "usr/lib", "/lib", + "--symlink", "usr/lib64 /lib64", + "--symlink", "usr/bin", "/bin", + "--symlink", "usr/sbin", "/sbin", + "--chdir", "/app", + "--unshare-all", + "--die-with-parent", + "--clearenv", +]; + +const HARE_COMMAND: &str = "/nix/store/cnysps4xzry4g26zyz7mmxfjj6wagpa6-hare-0.24.0/bin/hare"; + +/// Default command timeout in seconds. +const DEFAULT_TIMEOUT: u32 = 10; + +fn passwd_files(uid: u32, gid: u32) -> (File, File, 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::tempfile().unwrap(); + passwd_file.write_all(&passwd.stdout).unwrap(); + passwd_file.flush().unwrap(); + + let mut group_file = tempfile::tempfile().unwrap(); + group_file.write_all(&group.stdout).unwrap(); + group_file.flush().unwrap(); + + let args = vec![ + "--file".to_string(), + passwd_file.as_raw_fd().to_string(), + "/etc/passwd".to_string(), + "--file".to_string(), + group_file.as_raw_fd().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(), + user_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()], + ) +} + +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) { + 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().with_file_name("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); +}