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attester: tdx: strip CCEL #575

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attester: tdx: strip CCEL #575

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30 changes: 29 additions & 1 deletion attestation-agent/attester/src/tdx/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -106,6 +106,22 @@ impl TdxAttester {
}
}

fn find_stop_pos(buffer: &[u8]) -> usize {
let mut stop_pos: usize = 0;

const CHUNK_SIZE: usize = std::mem::size_of::<u64>();

for chunk in buffer.chunks_exact(CHUNK_SIZE) {
stop_pos += CHUNK_SIZE;

if u64::from_ne_bytes(chunk.try_into().unwrap()) == u64::MAX {
break;
}
}

stop_pos
}

#[async_trait::async_trait]
impl Attester for TdxAttester {
async fn get_evidence(&self, mut report_data: Vec<u8>) -> Result<String> {
Expand All @@ -130,7 +146,19 @@ impl Attester for TdxAttester {
let quote = engine.encode(quote_bytes);

let cc_eventlog = match std::fs::read(CCEL_PATH) {
Result::Ok(el) => Some(engine.encode(el)),
Result::Ok(el) => {
let stop_pos = find_stop_pos(&el);

log::debug!(
"Squeezed from {} to {} bytes",
std::fs::metadata(CCEL_PATH)?.len(),
stop_pos,
);

let (data, _) = el.split_at(stop_pos);

Some(engine.encode(data))
}
Result::Err(e) => {
log::warn!("Read CC Eventlog failed: {:?}", e);
None
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