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fix(migtd): store digests as tagged event bodies #921

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fix(migtd): store digests as tagged event bodies #921

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47 changes: 43 additions & 4 deletions src/migtd/src/bin/migtd/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -240,15 +240,28 @@ fn get_policy_and_measure(event_log: &mut [u8]) {
}
};

let event_data = policy;
// Store only the policy digest as the tagged event body; RTMR is still
// extended with the full policy bytes above via `hash_data`. Keeps the
// RA-TLS cert (which embeds the event log) under rustls' 64 KiB
// MAX_HANDSHAKE_SIZE regardless of policy growth.
let event_data = match event_log::calculate_digest(policy) {
Ok(d) => d,
Err(e) => {
log::error!("Failed to digest migration policy: {:?}\n", e);
panic_with_guest_crash_reg_report(
MigrationResult::InitializationError as u64,
b"Failed to digest migration policy",
);
}
};

// Measure and extend the migration policy to RTMR
let _ = event_log::write_tagged_event_log(
event_log,
MR_INDEX_POLICY,
policy,
TAGGED_EVENT_ID_POLICY,
event_data,
&event_data,
)
.map_err(|e| {
log::error!("Failed to log migration policy: {:?}\n", e);
Expand Down Expand Up @@ -323,13 +336,26 @@ fn get_policy_issuer_chain_and_measure(event_log: &mut [u8]) {
}
};

// Store only the chain digest as the tagged event body; see comment in
// get_policy_and_measure.
let event_data = match event_log::calculate_digest(policy_issuer_chain) {
Ok(d) => d,
Err(e) => {
log::error!("Failed to digest policy issuer chain: {:?}\n", e);
panic_with_guest_crash_reg_report(
MigrationResult::InitializationError as u64,
b"Failed to digest policy issuer chain",
);
}
};

// Measure and extend the policy issuer chain to RTMR
let _ = event_log::write_tagged_event_log(
event_log,
MR_INDEX_POLICY_ISSUER_CHAIN,
policy_issuer_chain,
TAGGED_EVENT_ID_POLICY_ISSUER_CHAIN,
policy_issuer_chain,
&event_data,
)
.map_err(|e| {
log::error!("Failed to log policy issuer chain: {:?}\n", e);
Expand All @@ -353,13 +379,26 @@ fn get_ca_and_measure(event_log: &mut [u8]) {
}
};

// Store only the CA digest as the tagged event body; see comment in
// get_policy_and_measure.
let event_data = match event_log::calculate_digest(root_ca) {
Ok(d) => d,
Err(e) => {
log::error!("Failed to digest SGX root CA: {:?}\n", e);
panic_with_guest_crash_reg_report(
MigrationResult::InitializationError as u64,
b"Failed to digest SGX root CA",
);
}
};

// Measure and extend the root certificate to RTMR
let _ = event_log::write_tagged_event_log(
event_log,
MR_INDEX_ROOT_CA,
root_ca,
TAGGED_EVENT_ID_ROOT_CA,
root_ca,
&event_data,
)
.map_err(|e| {
log::error!("Failed to log SGX root CA: {:?}\n", e);
Expand Down
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