Attestor abstraction

enclaves/quartz/src/attestor.rs

@@ -0,0 +1,27 @@
+use std::{
+    fs::{read, File},
+    io::{Error as IoError, Write},
+};
+
+use quartz_cw::msg::execute::attested::HasUserData;
+
+pub trait Attestor {
+    type Error: ToString;
+
+    fn quote(&self, user_data: impl HasUserData) -> Result<Vec<u8>, Self::Error>;
+}
+
+#[derive(Clone, PartialEq, Debug)]
+pub struct EpidAttestor;
+
+impl Attestor for EpidAttestor {
+    type Error = IoError;
+
+    fn quote(&self, user_data: impl HasUserData) -> Result<Vec<u8>, Self::Error> {
+        let user_data = user_data.user_data();
+        let mut user_report_data = File::create("/dev/attestation/user_report_data")?;
+        user_report_data.write_all(user_data.as_slice())?;
+        user_report_data.flush()?;
+        read("/dev/attestation/quote")
+    }
+}

enclaves/quartz/src/main.rs

@@ -14,6 +14,7 @@
     unused_qualifications
 )]
 
+mod attestor;
 mod cli;
 mod server;
 
@@ -24,7 +25,7 @@ use quartz_cw::state::{Config, LightClientOpts};
 use quartz_proto::quartz::core_server::CoreServer;
 use tonic::transport::Server;
 
-use crate::{cli::Cli, server::CoreService};
+use crate::{attestor::EpidAttestor, cli::Cli, server::CoreService};
 
 #[tokio::main(flavor = "current_thread")]
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
@@ -46,7 +47,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     );
 
     Server::builder()
-        .add_service(CoreServer::new(CoreService::new(config)))
+        .add_service(CoreServer::new(CoreService::new(config, EpidAttestor)))
         .serve(args.rpc_addr)
         .await?;