Lib.rs

Syd is a rock-solid user-space kernel to sandbox applications on Linux>=5.19. Syd is similar to Bubblewrap, Firejail, GVisor, and minijail. Syd is secure by default, and intends to provide a simple interface over various intricate Linux sandboxing mechanisms such as LandLock, Namespaces, ptrace, and seccomp-{bpf,notify}. You may run Syd as a regular user, with no extra privileges, and you can even set Syd as your login shell. A brief overview of Syd's capabilities are as follows:

• Read sandboxing
• Write sandboxing (and Path Masking)
• Stat sandboxing (aka Path Hiding)
• Exec sandboxing (and SegvGuard)
• Force sandboxing (aka Binary verification)
• Network sandboxing (feat. UNIX, IPv4, IPv6, and KCAPI sockets)
• Lock sandboxing (uses Landlock LSM)
• Memory sandboxing
• PID sandboxing (simpler alternatives to Control Groups)
• Namespaces and Containerization

Read the fine manuals of syd, libsyd, gosyd, plsyd, pysyd, rbsyd, syd.el and watch the asciicasts Memory Sandboxing, PID Sandboxing, Network Sandboxing, and Sandboxing Emacs with syd. Join the CTF event at https://ctftime.org/event/2178 and try to read the file /etc/CTF¹ on syd.chesswob.org with ssh user/pass: syd.

• Use cargo to install from source, requires libseccomp.
• To use with Docker or Podman build with the "oci" feature, see: https://man.exherbolinux.org/syd-oci.1.html
• Packaged on Exherbo as sys-apps/sydbox.
• Packaged on Gentoo as sys-apps/syd.
• Binary releases located at https://distfiles.exherbolinux.org/#sydbox/
• Releases are signed with this key: https://keybase.io/alip/pgp_keys.asc
• Change Log is here: https://gitlab.exherbo.org/sydbox/sydbox/-/blob/main/ChangeLog.md
• VIM syntax highlighting file for Syd profiles is here: https://gitlab.exherbo.org/sydbox/sydbox/-/tree/main/vim
• Tested on arm64, armv7, x86, and x86-64 with GitLab Pipelines, and SourceHut Builds.

Maintained by Ali Polatel. Up-to-date sources can be found at https://gitlab.exherbo.org/sydbox/sydbox.git and bugs/patches can be submitted to https://gitlab.exherbo.org/groups/sydbox/-/issues. Follow toots with the #sydbox hashtag and discuss in #sydbox on Libera Chat.

¹: The SHA256 checksum is f1af8d3946546f9d3b1af4fe15f0209b2298166208d51a481cf51ac8c5f4b294.

²: That cat's something I can't explain!