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fix(sdk): DSPX-1561 verify assertion bindings only with the selected key - #434
Manifest.Assertion.verify checks an assertion binding only with the key the reader selected for that assertion, exactly as before: the per-ID key, otherwise defaultKey, otherwise the payload key with HS256. A jwk or x5c in the binding's JWS header no longer replaces that key. The writer may still embed them.
The JWS alg must equal the selected key's algorithm. RSASSAVerifier and MACVerifier accept the whole RS* or HS* family, so a binding that declares RS384 or HS512 is now refused when the selected key is RS256 or HS256. That failure is an SDK.AssertionException carrying the assertion id.
No new types or error codes; the public verify signature is unchanged.
Split out of #432 (draft; the complete change), which goes further: it also checks that an embedded key matches the selected one and reports a reason for each failure (#438). Cross-SDK counterparts: opentdf/platform#4303, opentdf/web-sdk#1137.
Compatibility: an assertion signed with RS256 and read with no verification key configured now fails, because the payload key with HS256 is selected. Configure the signer's public key, per assertion id or as the default key, to read it. Embedding the signer's jwk or x5c doesn't change this.
Checklist
I have added or updated unit tests
I have added or updated integration tests (if appropriate)
I have added or updated documentation
Testing Instructions
mvn -pl sdk,cmdline -am test. New cases in AssertionConfiguredKeyTest; TDFTest's jwk/x5c header tests now show the embedded key adds nothing until the signer's key is configured.
Summary by CodeRabbit
Bug Fixes
Assertion verification now uses the configured verification key and requires the JWS algorithm to match that key.
Keys included in assertion headers no longer establish trust. Assertions without a configured key, or with a mismatched key or algorithm, fail verification.
Verify each assertion binding with the key the reader selects for it, as
before: the per-ID key, else the default key, else the payload key with
HS256. A jwk or x5c in the binding's JWS header no longer replaces that
key. The Java writer may still embed them; readers just don't use them to
verify.
The JWS alg must also equal the selected key's algorithm. RSASSAVerifier
and MACVerifier accept every RS* or HS* algorithm, so a binding declaring
RS384 or HS512 is now refused when the selected key is RS256 or HS256.
That failure is an AssertionException carrying the assertion id.
A binding signed with RS256 and read with no key configured now fails,
because the payload key with HS256 is selected; configure the signer's
public key, per ID or as the default, to read it.
Signed-off-by: Dave Mihalcik <dmihalcik@virtru.com>
Assertion verification now uses only the supplied verification key and rejects JWS headers with a different algorithm. Tests cover embedded JWK and X.509 certificate headers, configured RSA and HMAC keys, and verification without a configured key.
Assertion.verify uses the supplied key and requires the JWS algorithm to match the key algorithm. Tests check that embedded JWK and x5c values do not establish trust, matching configured keys verify, and mismatched algorithms fail.
No merge-blocking issue is established for the selected-key verification change; proceed with normal checks.
Pre-merge checks: 4 · 1
Failed checks: 1 warning
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Docstring Coverage
Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta…
Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed checks: 4 passed
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Title check
The title clearly summarizes the main change: assertion bindings are verified only with the selected key.
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Check skipped because no linked issues were found for this pull request.
Full details: Docstring Coverage
Explanation
Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 3 functions across 3 files.
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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A rabbit checks the signed payload, The chosen key stays in command. No header key can take its place, The matching algorithm must stand. Then hops away with tests in hand.
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Failed pre-merge checks:
- Docstring Coverage:
Write docstrings for the functions missing them to satisfy the coverage
threshold.
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Proposed Changes
Manifest.Assertion.verifychecks an assertion binding only with the key the reader selected for that assertion, exactly as before: the per-ID key, otherwisedefaultKey, otherwise the payload key with HS256. Ajwkorx5cin the binding's JWS header no longer replaces that key. The writer may still embed them.algmust equal the selected key's algorithm.RSASSAVerifierandMACVerifieraccept the whole RS* or HS* family, so a binding that declares RS384 or HS512 is now refused when the selected key is RS256 or HS256. That failure is anSDK.AssertionExceptioncarrying the assertion id.verifysignature is unchanged.Split out of #432 (draft; the complete change), which goes further: it also checks that an embedded key matches the selected one and reports a reason for each failure (#438). Cross-SDK counterparts: opentdf/platform#4303, opentdf/web-sdk#1137.
Compatibility: an assertion signed with RS256 and read with no verification key configured now fails, because the payload key with HS256 is selected. Configure the signer's public key, per assertion id or as the default key, to read it. Embedding the signer's
jwkorx5cdoesn't change this.Checklist
Testing Instructions
mvn -pl sdk,cmdline -am test. New cases inAssertionConfiguredKeyTest;TDFTest'sjwk/x5cheader tests now show the embedded key adds nothing until the signer's key is configured.Summary by CodeRabbit