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Jan-Erik Rediger 2024-05-24 21:58:49 +02:00
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14
backend/Cargo.toml Normal file
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@ -0,0 +1,14 @@
[package]
name = "backend"
version = "0.1.0"
edition = "2021"
[dependencies]
axum = "0.7.5"
libc = "0.2.155"
serde = { version = "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"] }

96
backend/src/main.rs Normal file
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@ -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<String, String>,
}
#[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<ExecRequest>) -> (StatusCode, Json<ExecResponse>) {
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::<MatchedPath>()
.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])!;
};
};
"#);
}

131
backend/src/sandbox.rs Normal file
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@ -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<String>) {
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<String> {
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<String>) {
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<String> {
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);
}