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DCAP attestation: Add GCP provenence check to establish whether the associated PPID is endorsed by Google #54

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DCAP attestation: Add GCP provenence check to establish whether the associated PPID is endorsed by Google #54

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5d3c8ea
Basic GCP provenance check
ameba23 Jun 11, 2026
7e12021
Dont parse quote twice
ameba23 Jun 12, 2026
a4ebbb2
Cache known GCP PPIDs
ameba23 Jun 12, 2026
9a4ea50
Measurement checks should check attestation type
ameba23 Jun 12, 2026
cfcce9b
Fix azure tests, and avoid unneeded cloning
ameba23 Jun 12, 2026
8da4cc6
Merge main
ameba23 Jun 23, 2026
5abd134
Add test for PPID extraction from current DCAP fixture
ameba23 Jun 23, 2026
f2f479f
Add expiry timestamp for cached PPIDs
ameba23 Jun 23, 2026
157bf2c
Improve timestamp check
ameba23 Jun 23, 2026
37e5e29
Merge branch 'main' into peg/gcp-provenance
ameba23 Jul 6, 2026
034c1f6
Minor code quality fixes
ameba23 Jul 6, 2026
355cc90
Revert changes from merge commit which are unrelated to this PR
ameba23 Jul 6, 2026
18b5780
Improve code readability on cache check and tokio runtime check
ameba23 Jul 6, 2026
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41 changes: 22 additions & 19 deletions crates/attestation/src/dcap.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -33,7 +33,7 @@ pub async fn verify_dcap_attestation(
input: Vec<u8>,
expected_input_data: [u8; 64],
pccs: Option<Pccs>,
) -> Result<MultiMeasurements, DcapVerificationError> {
) -> Result<(MultiMeasurements, Quote), DcapVerificationError> {

@ameba23 ameba23 Jul 6, 2026

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To avoid parsing the quote a second time to extract the PPID after verification, the verifier function now returns the parsed quote.

let now = std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH)?.as_secs();
let override_azure_outdated_tcb = false;
verify_dcap_attestation_with_given_timestamp(
Expand All @@ -58,7 +58,7 @@ pub fn verify_dcap_attestation_sync(
input: Vec<u8>,
expected_input_data: [u8; 64],
pccs: Pccs,
) -> Result<MultiMeasurements, DcapVerificationError> {
) -> Result<(MultiMeasurements, Quote), DcapVerificationError> {
let now = std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH)?.as_secs();
let override_azure_outdated_tcb = false;
verify_dcap_attestation_with_timestamp_sync(
Expand All @@ -84,7 +84,7 @@ pub fn verify_dcap_attestation_with_timestamp_sync(
collateral: Option<QuoteCollateralV3>,
now: u64,
override_azure_outdated_tcb: bool,
) -> Result<MultiMeasurements, DcapVerificationError> {
) -> Result<(MultiMeasurements, Quote), DcapVerificationError> {
let quote = Quote::parse(&input)?;

let ca = quote.ca()?;
Expand Down Expand Up @@ -118,7 +118,7 @@ pub async fn verify_dcap_attestation_with_given_timestamp(
collateral: Option<QuoteCollateralV3>,
now: u64,
override_azure_outdated_tcb: bool,
) -> Result<MultiMeasurements, DcapVerificationError> {
) -> Result<(MultiMeasurements, Quote), DcapVerificationError> {
let quote = Quote::parse(&input)?;

let ca = quote.ca()?;
Expand Down Expand Up @@ -156,7 +156,7 @@ fn verify_dcap_attestation_with_collateral_and_timestamp(
collateral: QuoteCollateralV3,
now: u64,
override_azure_outdated_tcb: bool,
) -> Result<MultiMeasurements, DcapVerificationError> {
) -> Result<(MultiMeasurements, Quote), DcapVerificationError> {
tracing::info!("Verifying DCAP attestation: {quote:?}");

let fmspc = hex::encode_upper(quote.fmspc()?);
Expand Down Expand Up @@ -197,19 +197,19 @@ fn verify_dcap_attestation_with_collateral_and_timestamp(

let measurements = MultiMeasurements::from_dcap_qvl_quote(&quote)?;

if get_quote_input_data(quote.report) != expected_input_data {
if get_quote_input_data(&quote.report) != expected_input_data {
return Err(DcapVerificationError::InputMismatch);
}

Ok(measurements)
Ok((measurements, quote))
}

#[cfg(any(test, feature = "mock"))]
pub async fn verify_dcap_attestation(
input: Vec<u8>,
expected_input_data: [u8; 64],
pccs: Option<Pccs>,
) -> Result<MultiMeasurements, DcapVerificationError> {
) -> Result<(MultiMeasurements, Quote), DcapVerificationError> {
let quote = Quote::parse(&input)?;
let ca = quote.ca()?;
let fmspc = hex::encode_upper(quote.fmspc()?);
Expand All @@ -224,19 +224,19 @@ pub async fn verify_dcap_attestation(
verifier.verify(&input, &collateral, now)?;

let measurements = MultiMeasurements::from_dcap_qvl_quote(&quote)?;
if get_quote_input_data(quote.report) != expected_input_data {
if get_quote_input_data(&quote.report) != expected_input_data {
return Err(DcapVerificationError::InputMismatch);
}

Ok(measurements)
Ok((measurements, quote))
}

#[cfg(any(test, feature = "mock"))]
pub fn verify_dcap_attestation_sync(
input: Vec<u8>,
expected_input_data: [u8; 64],
pccs: Pccs,
) -> Result<MultiMeasurements, DcapVerificationError> {
) -> Result<(MultiMeasurements, Quote), DcapVerificationError> {
let quote = Quote::parse(&input)?;
let ca = quote.ca()?;
let fmspc = hex::encode_upper(quote.fmspc()?);
Expand All @@ -246,10 +246,11 @@ pub fn verify_dcap_attestation_sync(
verifier.verify(&input, &collateral, now)?;

let measurements = MultiMeasurements::from_dcap_qvl_quote(&quote)?;
if get_quote_input_data(quote.report.clone()) != expected_input_data {
if get_quote_input_data(&quote.report) != expected_input_data {
return Err(DcapVerificationError::InputMismatch);
}
Ok(measurements)

Ok((measurements, quote))
}

/// Create a mock quote for testing on non-confidential hardware
Expand All @@ -267,7 +268,7 @@ fn generate_quote(input: [u8; 64]) -> Result<Vec<u8>, tdx_attest::TdxAttestError
}

/// Given a [Report] get the input data regardless of report type
pub fn get_quote_input_data(report: Report) -> [u8; 64] {
pub fn get_quote_input_data(report: &Report) -> [u8; 64] {
match report {
Report::TD10(r) => r.report_data,
Report::TD15(r) => r.base.report_data,
Expand Down Expand Up @@ -297,7 +298,7 @@ mod tests {
use mock_tdx::{MockPcsConfig, spawn_mock_pcs_server};

use super::*;
use crate::measurements::MeasurementPolicy;
use crate::{AttestationType, measurements::MeasurementPolicy};

#[tokio::test]
async fn test_dcap_verify() {
Expand Down Expand Up @@ -331,7 +332,7 @@ mod tests {
let async_collateral = serde_saphyr::from_slice(collateral_bytes).unwrap();
let sync_collateral = serde_saphyr::from_slice(collateral_bytes).unwrap();

let async_measurements = verify_dcap_attestation_with_given_timestamp(
let (async_measurements, _) = verify_dcap_attestation_with_given_timestamp(
attestation_bytes.to_vec(),
[
116, 39, 106, 100, 143, 31, 212, 145, 244, 116, 162, 213, 44, 114, 216, 80, 227,
Expand All @@ -347,7 +348,7 @@ mod tests {
.await
.unwrap();

let sync_measurements = verify_dcap_attestation_with_timestamp_sync(
let (sync_measurements, _) = verify_dcap_attestation_with_timestamp_sync(
attestation_bytes.to_vec(),
[
116, 39, 106, 100, 143, 31, 212, 145, 244, 116, 162, 213, 44, 114, 216, 80, 227,
Expand All @@ -363,7 +364,9 @@ mod tests {
.unwrap();

assert_eq!(async_measurements, sync_measurements);
measurement_policy.check_measurement(&async_measurements).unwrap();
measurement_policy
.check_measurement(AttestationType::DcapTdx, &async_measurements)
.unwrap();
}

// This specifically tests a quote which has outdated TCB level from Azure
Expand Down Expand Up @@ -409,7 +412,7 @@ mod tests {
let expected_input_data = [0xA5; 64];
let attestation_bytes = create_dcap_attestation(expected_input_data).unwrap();

let measurements =
let (measurements, _) =
verify_dcap_attestation(attestation_bytes, expected_input_data, Some(pccs))
.await
.unwrap();
Expand Down
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