136 lines
3.5 KiB
Rust
136 lines
3.5 KiB
Rust
use std::fs::File;
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use std::io::Write;
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use std::os::fd::AsRawFd;
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use std::process::Command;
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use tempfile::{TempDir, NamedTempFile};
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#[rustfmt::skip]
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const STATIC_ARGS: &[&str] = &[
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"--ro-bind", "/usr", "/usr",
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"--dir", "/tmp",
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"--dir", "/var",
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"--symlink", "../tmp", "/var/tmp",
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"--proc", "/proc",
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"--dev", "/dev",
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"--ro-bind", "/etc/resolv.conf", "/etc/resolv.conf",
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"--ro-bind", "/nix", "/nix",
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"--unshare-all",
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"--die-with-parent",
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"--clearenv",
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];
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const HARE_COMMAND: &str = "/nix/store/cnysps4xzry4g26zyz7mmxfjj6wagpa6-hare-0.24.0/bin/hare";
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/// Default command timeout in seconds.
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const DEFAULT_TIMEOUT: u32 = 10;
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fn passwd_files(uid: u32, gid: u32) -> (NamedTempFile, NamedTempFile, Vec<String>) {
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let uid = uid.to_string();
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let passwd = Command::new("getent")
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.args(["passwd", &uid, "65534"])
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.output()
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.expect("failed to run getent passwd");
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let gid = gid.to_string();
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let group = Command::new("getent")
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.args(["group", &gid, "65534"])
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.output()
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.expect("failed to run getent passwd");
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let mut passwd_file = tempfile::NamedTempFile::new().unwrap();
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passwd_file.write_all(&passwd.stdout).unwrap();
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passwd_file.flush().unwrap();
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let mut group_file = tempfile::NamedTempFile::new().unwrap();
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group_file.write_all(&group.stdout).unwrap();
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group_file.flush().unwrap();
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let args = vec![
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"--ro-bind".to_string(),
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passwd_file.path().display().to_string(),
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"/etc/passwd".to_string(),
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"--ro-bind".to_string(),
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group_file.path().display().to_string(),
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"/etc/group".to_string(),
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];
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(passwd_file, group_file, args)
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}
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fn home_dir(uid: u32) -> Vec<String> {
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let user_dir = format!("/run/user/{uid}");
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let home_dir = format!("{user_dir}/home");
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vec![
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"--dir".to_string(),
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user_dir.clone(),
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"--setenv".to_string(),
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"HOME".to_string(),
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home_dir,
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"--setenv".to_string(),
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"XDG_RUNTIME_DIR".to_string(),
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user_dir,
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]
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}
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fn shared_app_dir() -> (TempDir, Vec<String>) {
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let tmp_app_dir = tempfile::tempdir().unwrap();
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let app_dir_path = tmp_app_dir.path().display().to_string();
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(
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tmp_app_dir,
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vec![
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"--bind".to_string(),
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app_dir_path,
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"/app".to_string(),
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"--chdir".to_string(),
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"/app".to_string(),
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],
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)
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}
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fn command(app_file: &str) -> Vec<String> {
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vec![
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HARE_COMMAND.to_string(),
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"run".to_string(),
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app_file.to_string(),
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]
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}
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fn getids() -> (u32, u32) {
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unsafe { (libc::getuid(), libc::getgid()) }
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}
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pub fn run_code(code: &str) {
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let (uid, gid) = getids();
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let mut bwrap_cmd = Command::new("bwrap");
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bwrap_cmd.args(STATIC_ARGS);
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let (app_dir, dir_arg) = shared_app_dir();
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bwrap_cmd.args(dir_arg);
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let home_args = home_dir(uid);
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bwrap_cmd.args(home_args);
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let (_passwd, _group, file_args) = passwd_files(uid, gid);
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bwrap_cmd.args(file_args);
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{
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let code_path = app_dir.path().join("main.ha");
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let mut code_file = File::create(code_path).unwrap();
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code_file.write_all(code.as_bytes()).unwrap();
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}
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let cmd_args = command("/app/main.ha");
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bwrap_cmd.args(cmd_args);
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let output = bwrap_cmd.output().expect("running bwrap failed");
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let stdout = String::from_utf8_lossy(&output.stdout);
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let stderr = String::from_utf8_lossy(&output.stderr);
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println!("stdout:\n{stdout}");
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println!("stderr:\n{stderr}");
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}
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