feat: configuration for attestation

Co-authored-by: Roman Volosatovs <roman@profian.com>
Signed-off-by: Richard Zak <richard@profian.com>

Cargo.toml

@@ -30,6 +30,8 @@ anyhow = { version = "^1.0.66", default-features = false }
 base64 = { version = "^0.13.1", default-features = false }
 mime = { version = "^0.3.16", default-features = false }
 confargs = { version = "^0.1.3", default-features = false }
+serde = { version = "1.0", features = ["derive"], default-features = false }
+toml = { version = "0.5", default-features = false }
 
 [target.'cfg(not(target_os = "wasi"))'.dependencies]
 tokio = { version = "^1.21.2", features = ["rt-multi-thread", "macros"], default-features = false }
@@ -51,7 +53,8 @@ strip = true
 [workspace]
 resolver = '2'
 members = [
+    'crates/cryptography',
     'crates/sgx_validation',
     'crates/snp_validation',
-    'crates/cryptography',
+    'crates/validation_common',
 ]

crates/cryptography/Cargo.toml

@@ -13,6 +13,7 @@ rand = { version = "0.8", features = ["std"], default-features = false }
 rsa = {version = "0.7.2", features = ["std"], default-features = false }
 rustls-pemfile = {version = "1.0.1", default-features = false }
 sec1 = { version = "0.3", features = ["std", "pkcs8"], default-features = false }
+serde = { version = "1.0", features = ["derive", "std"], default-features = false }
 sha2 = { version = "^0.10.2", default-features = false }
 signature = {version = "1.6", default-features = false }
 spki = { version = "0.6", default-features = false }

crates/sgx_validation/Cargo.toml

@@ -7,9 +7,12 @@ description = "Intel SGX Attestation validation library for Steward"
 
 [dependencies]
 cryptography = { path = "../cryptography" }
+validation_common = { path = "../validation_common" }
 anyhow = { version = "^1.0.55", default-features = false }
 der = { version = "0.6", features = ["std"], default-features = false }
+serde = { version = "1.0", features = ["derive", "std"], default-features = false }
 sgx = { version = "0.6.0", default-features = false }
 
 [dev-dependencies]
 testaso = { version = "0.1", default-features = false }
+toml = { version = "0.5", default-features = false }

crates/sgx_validation/src/config.rs

@@ -0,0 +1,117 @@
+// SPDX-FileCopyrightText: 2022 Profian Inc. <opensource@profian.com>
+// SPDX-License-Identifier: AGPL-3.0-only
+
+use serde::{Deserialize, Deserializer, Serialize};
+use sgx::parameters::Features;
+use validation_common::Measurements;
+
+#[derive(Clone, Deserialize, Debug, Serialize)]
+pub enum SgxFeatures {
+    CET,
+    Debug,
+    EIntKey,
+    KSS,
+    ProvisioningKey,
+}
+
+#[derive(Clone, Deserialize, Debug, Default)]
+pub struct Config {
+    /// Values for `mrsigner` in the report body, as `Measurements::signer()`
+    /// This is the list of public keys which have signed the Enarx binary.
+    /// Values for `mrenclave` in the report body, as `Measurements::hash()`
+    /// This is the hash of the Enclave environment after the Enarx binary is loaded
+    /// but before any workload is loaded, so this is a hash of the Enarx binary
+    /// in memory.
+    #[serde(default, flatten)]
+    pub measurements: Measurements<32>,
+
+    /// Values for `features`.
+    #[serde(default)]
+    #[serde(deserialize_with = "from_features")]
+    pub features: u64,
+
+    /// Minimum value for `isv_svn`.
+    pub enclave_security_version: Option<u16>,
+
+    /// Value for `isv_prodid`, do not allow versions below this.
+    pub enclave_product_id: Option<u16>,
+}
+
+fn from_features<'de, D>(deserializer: D) -> Result<u64, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    let s: Vec<SgxFeatures> = Deserialize::deserialize(deserializer)?;
+
+    let mut flags = Features::empty();
+
+    // Must be set according to Intel SGX documentation, this indicates permission
+    // to create SGX enclaves.
+    flags |= Features::INIT;
+
+    // Required by Enarx, as Wasmtime requires 64-bit, and modern systems are all 64-bit anyway
+    flags |= Features::MODE64BIT;
+
+    for flag in s {
+        match flag {
+            SgxFeatures::CET => {
+                flags |= Features::CET;
+            }
+            SgxFeatures::Debug => {
+                flags |= Features::DEBUG;
+            }
+            SgxFeatures::EIntKey => {
+                flags |= Features::EINIT_KEY;
+            }
+            SgxFeatures::KSS => {
+                flags |= Features::KSS;
+            }
+            SgxFeatures::ProvisioningKey => {
+                flags |= Features::PROVISIONING_KEY;
+            }
+        }
+    }
+
+    Ok(flags.bits())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use validation_common::Digest;
+
+    #[test]
+    fn empty_config() {
+        assert!(toml::from_str::<Config>("").is_err());
+    }
+
+    #[test]
+    fn list_of_hashes() {
+        const SIGNER: &str = r#"enarx_signer = ["2eba0f494f428e799c22d6f12778aebea4dc8d991f9e63fd3cddd57ac6eb5dd9"]"#;
+        let signer = Digest([
+            0x2e, 0xba, 0x0f, 0x49, 0x4f, 0x42, 0x8e, 0x79, 0x9c, 0x22, 0xd6, 0xf1, 0x27, 0x78,
+            0xae, 0xbe, 0xa4, 0xdc, 0x8d, 0x99, 0x1f, 0x9e, 0x63, 0xfd, 0x3c, 0xdd, 0xd5, 0x7a,
+            0xc6, 0xeb, 0x5d, 0xd9,
+        ]);
+
+        let config: Config = toml::from_str(&format!(
+            r#"
+{SIGNER}
+"#,
+        ))
+        .expect("Couldn't deserialize");
+
+        assert_eq!(config.measurements.signer.len(), 1);
+        assert!(config.measurements.signer.contains(&signer));
+    }
+
+    #[test]
+    fn too_short() {
+        let config: Result<Config, toml::de::Error> = toml::from_str(
+            r#"
+        enarx_signer = ["41c179d5c0d5bc4915752ccf9bbd2baa574716832235ef5bb998fadcda1e46"]
+        "#,
+        );
+        assert!(config.is_err());
+    }
+}