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AppOS

https://github.com/distrust-foundation/appos

About

A minimal, immutable, and deterministic Linux unikernel build system targeting various Trusted Execution Environments for use cases that require high security and accountability.

This is intended as a reference repository which could serve as a boilerplate to build your own hardened and immutable operating system images for high security applications.

Platforms

Platform	Target	Status	Verified boot Method
Generic/Qemu	generic	working	Safeboot or Heads
AWS Nitro Enclaves	aws	building	HOTP via Nitrokey
GCP Confidential Compute	gcp	research	vTPM 2.0 attestation
Azure Confidential VMs	azure	research	vTPM 2.0 attestation

Features

Immutability
- Root filesystem is a CPIO filesystem extracted to a RamFS at boot
Minimalism
- < 5MB footprint
- Nothing is included but a kernel and your target binary by default
- Sample "hello world" included as a default reference
- Debug builds include busybox init shim and drop to a shell
Determinism
- Multiple people can build artifacts and get identical hashes
- Allows one to prove distributed artifacts correspond to published sources
Hardening
- No TCP/IP network support
  - Favor using a virtual socket or physical interface to a gateway system
- Most unessesary kernel features are disabled at compile time
- Follow Kernel Self Protection Project recommendations

Development

Requirements

10GB+ free RAM
Docker 20+
GNU Make

Examples

Build given target

make TARGET=generic

Boot generic image in Qemu

make run

Enter shell in toolchain environment

make toolchain-shell

Update toolchain depedendency pins

make toolchain-update

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