Refactor attestation generation, verification and measurement logic to separate crate

Cargo.toml

@@ -1,5 +1,5 @@
 [workspace]
-members = [".", "attestation-provider-server", "attested-tls"]
+members = [".", "attestation-provider-server", "attested-tls", "attestation"]
 
 [package]
 name = "attested-tls-proxy"

attestation/Cargo.toml

@@ -0,0 +1,59 @@
+[package]
+name = "attestation"
+version = "0.0.1"
+edition = "2024"
+license = "MIT"
+description = "Attestation generation and verification, and measurement policy handling"
+repository = "https://github.com/flashbots/attested-tls-proxy"
+keywords = ["attestation", "CVM", "TDX"]
+
+[dependencies]
+tokio = { version = "1.48.0", features = ["fs"] }
+tokio-rustls = { version = "0.26.4", default-features = false, features = [
+  "ring",
+] }
+x509-parser = "0.18.0"
+thiserror = "2.0.17"
+anyhow = "1.0.100"
+pem-rfc7468 = { version = "0.7.0", features = ["std"] }
+configfs-tsm = "0.0.2"
+rand_core = { version = "0.6.4", features = ["getrandom"] }
+dcap-qvl = { git = "https://github.com/flashbots/dcap-qvl.git", branch = "peg/azure-outdated-tcp-override", features = ["danger-allow-tcb-override"] }
+hex = "0.4.3"
+http = "1.3.1"
+serde_json = "1.0.145"
+serde = "1.0.228"
+base64 = "0.22.1"
+reqwest = { version = "0.12.23", default-features = false, features = [
+  "rustls-tls-webpki-roots-no-provider",
+] }
+tracing = "0.1.41"
+parity-scale-codec = "3.7.5"
+openssl = "0.10.75"
+num-bigint = "0.4.6"
+webpki = { package = "rustls-webpki", version = "0.103.8" }
+time = "0.3.47"
+once_cell = "1.21.3"
+
+# Used for azure vTPM attestation support
+az-tdx-vtpm = { version = "0.7.4", optional = true }
+tss-esapi = { version = "7.6.0", optional = true }
+
+# Used by test helpers
+tdx-quote = { version = "0.0.5", features = ["mock"], optional = true }
+
+[dev-dependencies]
+tempfile = "3.23.0"
+tdx-quote = { version = "0.0.5", features = ["mock"] }
+
+[features]
+default = []
+
+# Adds support for Microsoft Azure attestation generation and verification
+azure = ["tss-esapi", "az-tdx-vtpm"]
+
+# Exposes helper functions for testing - do not enable in production as this allows dangerous configuration
+test-helpers = []
+
+# Allows mock quotes used in tests
+mock = ["tdx-quote"]

attested-tls/src/attestation/azure/ak_certificate.rs → attestation/src/azure/ak_certificate.rs

@@ -1,5 +1,5 @@
 //! Generation and verification of AK certificates from the vTPM
-use crate::attestation::azure::{MaaError, nv_index};
+use crate::azure::{MaaError, nv_index};
 use once_cell::sync::Lazy;
 use std::time::Duration;
 use tokio_rustls::rustls::pki_types::{CertificateDer, TrustAnchor, UnixTime};

attested-tls/src/attestation/azure/mod.rs → attestation/src/azure/mod.rs

@@ -12,9 +12,7 @@ use serde::{Deserialize, Serialize};
 use thiserror::Error;
 use x509_parser::prelude::*;
 
-use crate::attestation::{
-    dcap::verify_dcap_attestation_with_given_timestamp, measurements::MultiMeasurements,
-};
+use crate::{dcap::verify_dcap_attestation_with_given_timestamp, measurements::MultiMeasurements};
 
 /// The attestation evidence payload that gets sent over the channel
 #[derive(Debug, Serialize, Deserialize)]
@@ -339,12 +337,12 @@ pub enum MaaError {
     #[error("HCL runtime claims user-data does not match expected report input data")]
     ClaimsUserDataInputMismatch,
     #[error("DCAP verification: {0}")]
-    DcapVerification(#[from] crate::attestation::dcap::DcapVerificationError),
+    DcapVerification(#[from] crate::dcap::DcapVerificationError),
 }
 
 #[cfg(test)]
 mod tests {
-    use crate::attestation::measurements::MeasurementPolicy;
+    use crate::measurements::MeasurementPolicy;
 
     use super::*;
 
@@ -363,7 +361,7 @@ mod tests {
     #[tokio::test]
     async fn test_decode_hcl() {
         // From cvm-reverse-proxy/internal/attestation/azure/tdx/testdata/hclreport.bin
-        let hcl_bytes: &'static [u8] = include_bytes!("../../../test-assets/hclreport.bin");
+        let hcl_bytes: &'static [u8] = include_bytes!("../../test-assets/hclreport.bin");
 
         let hcl_report = hcl::HclReport::new(hcl_bytes.to_vec()).unwrap();
         let hcl_var_data = hcl_report.var_data();
@@ -382,7 +380,7 @@ mod tests {
     #[tokio::test]
     async fn test_verify() {
         let attestation_bytes: &'static [u8] =
-            include_bytes!("../../../test-assets/azure-tdx-1764662251380464271");
+            include_bytes!("../../test-assets/azure-tdx-1764662251380464271");
 
         // To avoid this test stopping working when the certificate is no longer valid we pass in a
         // timestamp
@@ -411,7 +409,7 @@ mod tests {
             .unwrap();
 
         let collateral_bytes: &'static [u8] =
-            include_bytes!("../../../test-assets/azure-collateral02.json");
+            include_bytes!("../../test-assets/azure-collateral02.json");
 
         let collateral = serde_json::from_slice(collateral_bytes).unwrap();
 
@@ -432,14 +430,14 @@ mod tests {
     #[tokio::test]
     async fn test_verify_fails_on_input_mismatch() {
         let attestation_bytes: &'static [u8] =
-            include_bytes!("../../../test-assets/azure-tdx-1764662251380464271");
+            include_bytes!("../../test-assets/azure-tdx-1764662251380464271");
         let now = 1771423480;
 
         let mut expected_input_data = input_data_from_attestation(attestation_bytes);
         expected_input_data[63] ^= 0x01;
 
         let collateral_bytes: &'static [u8] =
-            include_bytes!("../../../test-assets/azure-collateral02.json");
+            include_bytes!("../../test-assets/azure-collateral02.json");
         let collateral = serde_json::from_slice(collateral_bytes).unwrap();
 
         let err = verify_azure_attestation_with_given_timestamp(

attested-tls/src/attestation/dcap.rs → attestation/src/dcap.rs

@@ -1,5 +1,5 @@
 //! Data Center Attestation Primitives (DCAP) evidence generation and verification
-use crate::attestation::{AttestationError, measurements::MultiMeasurements};
+use crate::{AttestationError, measurements::MultiMeasurements};
 
 use configfs_tsm::QuoteGenerationError;
 use dcap_qvl::{
@@ -168,13 +168,13 @@ pub enum DcapVerificationError {
 
 #[cfg(test)]
 mod tests {
-    use crate::attestation::measurements::MeasurementPolicy;
+    use crate::measurements::MeasurementPolicy;
 
     use super::*;
     #[tokio::test]
     async fn test_dcap_verify() {
         let attestation_bytes: &'static [u8] =
-            include_bytes!("../../test-assets/dcap-tdx-1766059550570652607");
+            include_bytes!("../test-assets/dcap-tdx-1766059550570652607");
 
         // To avoid this test stopping working when the certificate is no longer valid we pass in a
         // timestamp
@@ -199,7 +199,7 @@ mod tests {
             .unwrap();
 
         let collateral_bytes: &'static [u8] =
-            include_bytes!("../../test-assets/dcap-quote-collateral-00.json");
+            include_bytes!("../test-assets/dcap-quote-collateral-00.json");
 
         let collateral = serde_json::from_slice(collateral_bytes).unwrap();
 
@@ -226,14 +226,14 @@ mod tests {
     #[tokio::test]
     async fn test_dcap_verify_azure_override() {
         let attestation_bytes: &'static [u8] =
-            include_bytes!("../../test-assets/azure_failed_dcap_quote_10.bin");
+            include_bytes!("../test-assets/azure_failed_dcap_quote_10.bin");
 
         // To avoid this test stopping working when the certificate is no longer valid we pass in a
         // timestamp
         let now = 1771414156;
 
         let collateral_bytes: &'static [u8] =
-            include_bytes!("../../test-assets/azure-collateral.json");
+            include_bytes!("../test-assets/azure-collateral.json");
 
         let collateral = serde_json::from_slice(collateral_bytes).unwrap();
 

attested-tls/src/attestation/mod.rs → attestation/src/lib.rs

@@ -5,6 +5,9 @@ pub mod azure;
 pub mod dcap;
 pub mod measurements;
 
+#[cfg(any(test, feature = "test-helpers"))]
+pub mod test_helpers;
+
 use measurements::MultiMeasurements;
 use parity_scale_codec::{Decode, Encode};
 use serde::{Deserialize, Serialize};
@@ -16,7 +19,7 @@ use std::{
 
 use thiserror::Error;
 
-use crate::attestation::{dcap::DcapVerificationError, measurements::MeasurementPolicy};
+use crate::{dcap::DcapVerificationError, measurements::MeasurementPolicy};
 
 const GCP_METADATA_API: &str =
     "http://metadata.google.internal/computeMetadata/v1/project/project-id";

attested-tls/src/attestation/measurements.rs → attestation/src/measurements.rs

@@ -1,5 +1,5 @@
 //! Measurements and policy for enforcing them when validating a remote attestation
-use crate::attestation::{AttestationError, AttestationType, dcap::DcapVerificationError};
+use crate::{AttestationError, AttestationType, dcap::DcapVerificationError};
 use std::{collections::HashMap, path::PathBuf};
 use std::{fmt, fmt::Formatter};
 

attestation/src/test_helpers.rs

@@ -0,0 +1,13 @@
+use crate::{MultiMeasurements, measurements::DcapMeasurementRegister};
+use std::collections::HashMap;
+
+/// All-zero measurment values used in some tests
+pub fn mock_dcap_measurements() -> MultiMeasurements {
+    MultiMeasurements::Dcap(HashMap::from([
+        (DcapMeasurementRegister::MRTD, [0u8; 48]),
+        (DcapMeasurementRegister::RTMR0, [0u8; 48]),
+        (DcapMeasurementRegister::RTMR1, [0u8; 48]),
+        (DcapMeasurementRegister::RTMR2, [0u8; 48]),
+        (DcapMeasurementRegister::RTMR3, [0u8; 48]),
+    ]))
+}

attested-tls/Cargo.toml

@@ -16,30 +16,11 @@ sha2 = "0.10.9"
 x509-parser = "0.18.0"
 thiserror = "2.0.17"
 webpki-roots = "1.0.4"
-anyhow = "1.0.100"
-pem-rfc7468 = { version = "0.7.0", features = ["std"] }
-configfs-tsm = "0.0.2"
-rand_core = { version = "0.6.4", features = ["getrandom"] }
-dcap-qvl = { git = "https://github.com/flashbots/dcap-qvl.git", branch = "peg/azure-outdated-tcp-override", features = ["danger-allow-tcb-override"] }
-hex = "0.4.3"
 http = "1.3.1"
 serde_json = "1.0.145"
-serde = "1.0.228"
-base64 = "0.22.1"
-reqwest = { version = "0.12.23", default-features = false, features = [
-  "rustls-tls-webpki-roots-no-provider",
-] }
 tracing = "0.1.41"
 parity-scale-codec = "3.7.5"
-openssl = "0.10.75"
-num-bigint = "0.4.6"
-webpki = { package = "rustls-webpki", version = "0.103.8" }
-time = "0.3.47"
-once_cell = "1.21.3"
-
-# Used for azure vTPM attestation support
-az-tdx-vtpm = { version = "0.7.4", optional = true }
-tss-esapi = { version = "7.6.0", optional = true }
+attestation = { path = "../attestation" }
 
 # Used for websocket support
 tokio-tungstenite = { version = "0.28.0", optional = true }
@@ -57,18 +38,17 @@ http-body-util = { version = "0.1.3", optional = true }
 
 # Used by test helpers
 rcgen = { version = "0.14.5", optional = true }
-tdx-quote = { version = "0.0.5", features = ["mock"], optional = true }
 
 [dev-dependencies]
 rcgen = "0.14.5"
 tempfile = "3.23.0"
-tdx-quote = { version = "0.0.5", features = ["mock"] }
+attestation = { path = "../attestation", features = ["test-helpers", "mock"] }
 
 [features]
 default = ["ws", "rpc"]
 
 # Adds support for Microsoft Azure attestation generation and verification
-azure = ["tss-esapi", "az-tdx-vtpm"]
+azure = ["attestation/azure"]
 
 # Adds websocket support
 ws = ["tokio-tungstenite", "futures-util"]
@@ -87,6 +67,6 @@ rpc = [
 ]
 
 # Exposes helper functions for testing - do not enable in production as this allows dangerous configuration
-test-helpers = ["rcgen"]
+test-helpers = ["rcgen", "attestation/test-helpers"]
 
-mock = ["tdx-quote"]
+mock = ["attestation/mock"]