Aurora: Providing Trusted System Services for Enclaves On an Untrusted System

Intel SGX provisions shielded executions for securitysensitive computation, but lacks support for trusted system services (TSS), such as clock, network and filesystem. This makes enclaves vulnerable to Iago attacks [12] in the face of a powerful malicious system. To mitigate this problem, we present Aurora, a novel architecture that provides TSSes via a secure channel between enclaves and devices on top of an untrusted system, and implement two types of TSSes, i.e. clock and end-to-end network. We evaluate our solution by porting SQLite and OpenSSL into Aurora, experimental results show that SQLite benefits from a microsecond accuracy trusted clock and OpenSSL gains end-to-end secure network with about 1ms overhead.