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Cloud Key Store - secure storage for private credentials

Introduction

Cloud Key Store (CKS) is a tool to protect private cryptographic keys in the cloud. It performs cryptographic operations using the keys based on user requests. The user authentication is password based. An example usage is to store GnuPG private keys.

A detailed discussion of our motivation, threat model, design decisions, and evaluation of the CKS is presented in our technical paper: https://arxiv.org/abs/1804.08569

Building instructions

Prerequisites

  • Install SGX SDK:

    • Download and install Intel SGX SDK for Linux
    • Set the SGX_SDK variable in the Makefile to the location of your SGX SDK
    • Set the SIGNING_KEY variable in the Makefile to point to an enclave signing key. If needed, generate a signing key following Intel's OpenSSL Examples

  • Build the 3rd party libraries

    • Clone sgx-utils
    • Build libraries by running make.
    • Copy them to ./libs directory, or modify Makefile Lib_Dir variable.
    • The required libraries are lib_tke and lib_uke.

Building CKS server

  • Make sure that the Makefile libdir variable points to the right directory (sgx-utils/libs), and the paths to the 3rd party libraries are correct.
  • Run make. This will generate objects under build directory and keystore and client executables. The enclave will be put under build/enclave.
  • To test the build run ./keystore, connect to the server by running ./client.
  • To build tests run cmake in the test directory. Run make check to run the unit tests.

Installation

In order verify the quote recieved during remote attestation, you need access to the Intel Attestation Service (IAS). This requires registering with Intel via this form. Once registered, set your assigned Service Provider ID (SPID) in the ias.cpp file.