Hakoniwa

Process isolation for Linux using namespaces, resource limits and seccomp. It works by creating a new, completely empty, mount namespace where the root is on a tmpdir, and will be automatically cleaned up when the last process exits.

It uses the following techniques:

• Linux namespaces: Create an isolated environment for the process.
• MNT namespace + pivot_root: Create a new root file system for the process.
• setrlimit: Limit the amount of resources that can be used by the process.
• seccomp: Limit the set of system calls that can be used by the process.

Installation

Cargo

• Install libseccomp by following this guide.
• Install the rust toolchain in order to have cargo installed by following this guide.
• Run cargo install hakoniwa-cli.

Usage

CLI

$ hakoniwa run -- sh
sh-5.2$ pwd
/
sh-5.2$ ls
bin  etc  lib  lib64  proc  sbin  usr
sh-5.2$ ls /proc
1           bus        crypto         execdomains  ioports    kmsg         meminfo  net           self      sysrq-trigger  version
3           cgroups    devices        fb           irq        kpagecgroup  misc     pagetypeinfo  slabinfo  sysvipc        vmallocinfo
acpi        cmdline    diskstats      filesystems  kallsyms   kpagecount   modules  partitions    softirqs  thread-self    vmstat
asound      config.gz  dma            fs           kcore      kpageflags   mounts   pressure      stat      timer_list     zoneinfo
bootconfig  consoles   driver         interrupts   key-users  loadavg      mtd      schedstat     swaps     tty
buddyinfo   cpuinfo    dynamic_debug  iomem        keys       locks        mtrr     scsi          sys       uptime
sh-5.2$ ps aux
USER         PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
johndoe        1  0.0  0.0   4708  4020 ?        S    21:22   0:00 /usr/bin/sh
johndoe        4  0.0  0.0   6620  3896 ?        R+   21:22   0:00 ps aux
sh-5.2$ exit
exit

$ hakoniwa run -vv --config ~/.config/hakoniwa.d/firefox.toml
[2025-03-14T11:11:36Z DEBUG] CONFIG: /home/johndoe/.config/hakoniwa.d/firefox.toml
[2025-03-14T11:11:36Z TRACE] CONFIG: Including /home/johndoe/.config/hakoniwa.d/abstractions/base.toml
[2025-03-14T11:11:36Z TRACE] CONFIG: Including /home/johndoe/.config/hakoniwa.d/abstractions/dbus-session.toml
[2025-03-14T11:11:36Z TRACE] CONFIG: Including /home/johndoe/.config/hakoniwa.d/abstractions/dbus-system.toml
[2025-03-14T11:11:36Z TRACE] CONFIG: Including /home/johndoe/.config/hakoniwa.d/abstractions/x11.toml
[2025-03-14T11:11:36Z TRACE] CONFIG: Including /home/johndoe/.config/hakoniwa.d/abstractions/audio.toml
[2025-03-14T11:11:36Z TRACE] CONFIG: Including /home/johndoe/.config/hakoniwa.d/abstractions/graphics.toml
[2025-03-14T11:11:36Z DEBUG] Unshare namespaces: CloneFlags(CLONE_NEWNS | CLONE_NEWCGROUP | CLONE_NEWUTS | CLONE_NEWIPC | CLONE_NEWUSER | CLONE_NEWPID)
[2025-03-14T11:11:36Z DEBUG] RootDir: "/tmp/hakoniwa-WrEI5a" -> "/"
...
[2025-03-14T11:11:36Z TRACE] Seccomp rule: perf_event_open(...) -> Allow
[2025-03-14T11:11:36Z DEBUG] Execve: "/usr/bin/firefox", []
...

More examples can be found in hakoniwa-cli/examples.

Rust Library

The code below is almost eq to hakoniwa run -- sh:

use hakoniwa::Container;

fn main() {
    _ = Container::new()        // Create Container with new namespaces via unshare
        .rootfs("/")            // Mount necessary directories, e.g. `/bin`
        // .devfsmount("/dev")     // Mount `devfs` on `/dev`, it contains a minimal set of device files, like `/dev/null`
        // .tmpfsmount("/tmp")     // Mount `tmpfs` on `/tmp`
        // .setrlimit(..)          // Set resource limits
        .command("/bin/sh")     // Create Command
        .status()               // Execute
        .expect("failed to execute process witnin container");
}

More examples can be found in hakoniwa/examples.

Implementation of Command::status

Acknowledgements

• Special thanks to bubblewrap.

License

The CLI is licensed under the GPL-3.0-only.

The Library is licensed under the LGPL-3.0 WITH LGPL-3.0-linking-exception.