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feat(kas): Add nano policy binding to rewrap audit. #2870

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Merged
merged 2 commits into from
Nov 4, 2025
Merged

feat(kas): Add nano policy binding to rewrap audit. #2870

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fb0a3b6
feat(kas): Add nano policy binding to rewrap audit.
c-r33d Nov 3, 2025
3059c36
bump sdk version.
c-r33d Nov 4, 2025
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33 changes: 21 additions & 12 deletions service/kas/access/rewrap.go
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Original file line number Diff line number Diff line change
Expand Up @@ -84,8 +84,9 @@ type kaoResult struct {
EphemeralPublicKey []byte
RequiredObligations []string

// Only populated for Nano auditing, since policy is encrypted
KeyID string
// Only populated for Nano auditing
KeyID string
PolicyBinding string
}

// From policy ID to KAO ID to result
Expand Down Expand Up @@ -901,11 +902,12 @@ func (p *Provider) nanoTDFRewrap(ctx context.Context, requests []*kaspb.Unsigned
}

auditEventParams := audit.RewrapAuditEventParams{
Policy: kasPolicy,
IsSuccess: access,
TDFFormat: "Nano",
Algorithm: req.GetAlgorithm(),
KeyID: kaoInfo.KeyID,
Policy: kasPolicy,
IsSuccess: access,
TDFFormat: "Nano",
Algorithm: req.GetAlgorithm(),
KeyID: kaoInfo.KeyID,
PolicyBinding: kaoInfo.PolicyBinding,
}

if !access {
Expand Down Expand Up @@ -986,9 +988,15 @@ func (p *Provider) verifyNanoRewrapRequests(ctx context.Context, req *kaspb.Unsi
}

// check the policy binding
verify, err := header.VerifyPolicyBinding()
binding, err := header.PolicyBinding()
if err != nil {
failedKAORewrap(results, kao, fmt.Errorf("failed to retrieve policy binding: %w", err))
return nil, results
}

verify, err := binding.Verify()
if err != nil {
failedKAORewrap(results, kao, fmt.Errorf("failed to verify policy binding: %w", err))
failedKAORewrap(results, kao, fmt.Errorf("error verifying policy binding: %w", err))
return nil, results
}

Expand All @@ -997,9 +1005,10 @@ func (p *Provider) verifyNanoRewrapRequests(ctx context.Context, req *kaspb.Unsi
return nil, results
}
results[kao.GetKeyAccessObjectId()] = kaoResult{
ID: kao.GetKeyAccessObjectId(),
DEK: symmetricKey,
KeyID: kid,
ID: kao.GetKeyAccessObjectId(),
DEK: symmetricKey,
KeyID: kid,
PolicyBinding: binding.String(),
}
return policy, results
}
Expand Down
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