commit 0bf48476e1a66140950ab1c3ad67643f36cdf4a2
Author: Jan-Erik Rediger <janerik@fnordig.de>
Date:   Fri May 24 21:58:49 2024 +0200

    first things together

diff --git a/.gitignore b/.gitignore
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diff --git a/backend/Cargo.toml b/backend/Cargo.toml
new file mode 100644
index 0000000..9b28bb2
--- /dev/null
+++ b/backend/Cargo.toml
@@ -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"] }
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<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])!;
+        };
+};
+        "#);
+}
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<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);
+}