teepot

Key Value store in a TEE with Remote Attestation for Authentication

Introduction

This project is a key-value store that runs in a Trusted Execution Environment (TEE) and uses Remote Attestation for Authentication. The key-value store is implemented using Hashicorp Vault running in an Intel SGX enclave via the Gramine runtime.

Parts of this project

• teepot: The main rust crate that abstracts TEEs and key-value stores.
• tee-vault-unseal: An enclave that uses the Vault API to unseal a vault as a proxy.
• vault-unseal: A client utility, that talks to tee-vault-unseal to unseal a vault.
• tee-vault-admin: An enclave that uses the Vault API to administer a vault as a proxy.
• vault-admin: A client utility, that talks to tee-vault-admin to administer a vault.
• teepot-read : A pre-exec utility that reads from the key-value store and passes the key-value pairs as environment variables to the enclave.
• teepot-write : A pre-exec utility that reads key-values from the environment variables and writes them to the key-value store.
• verify-attestation: A client utility that verifies the attestation of an enclave.
• tee-key-preexec: A pre-exec utility that generates a p256 secret key and passes it as an environment variable to the enclave along with the attestation quote containing the hash of the public key.

Development

Prerequisites

Install nix.

In ~/.config/nix/nix.conf

experimental-features = nix-command flakes

or on nixos in /etc/nixos/configuration.nix add the following lines:

{
  nix = {
    extraOptions = ''
      experimental-features = nix-command flakes
    '';
  };
}

Optionally install cachix (to save build time) and use the nixsgx cache:

$ nix-env -iA cachix -f https://cachix.org/api/v1/install
$ cachix use nixsgx

Develop

$ nix develop --impure

optionally create .envrc for direnv to automatically load the environment when entering the directory:

$ cat <<EOF > .envrc
use flake .#teepot
EOF
$ direnv allow

Format for commit

$ nix run .#fmt

Build as the CI would

$ nix run nixpgks#ci

Build and test individual container

See the packages directory for the available packages.

$ nix build -L .#container-vault-sgx-azure
$ docker load -i result
$ docker build --progress plain --no-cache -f packages/container-vault-sgx-azure/Dockerfile -t vault-sgx-azure:latest  .
[...]
#8 5.966 Measurement:
#8 5.966     96602d8ae60673b3c44b6198b4b5f728480b1f00e9d48e7d3979cf1cf075bb5d
[...]