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feat(xtest): cover hexless policy bindings, Base64(HMAC) - #648
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly identifies the main change: adding xtests for hexless policy bindings that use Base64(HMAC). Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
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pflynn-virtru
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October 14, 2026 19:27
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Inline comments:
Review comments at @xtest/test_tdfs.py:
- Line 734: Update the filecmp.cmp assertion to pass shallow=False so the test
compares the plaintext bytes instead of relying on matching file metadata.
- Around line 716-718: Gate the spec-form success test using the platform
capability mechanism so it runs only when the tested platform includes
opentdf/platform#4223; keep released-platform matrix entries from running this
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xtest/test_tdfs.pyxtest/test_tdfs_units.py
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dmihalcik-virtru
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| #: Platform releases in [BUG, FIX) reject the spec's Base64(HMAC) policy binding | ||
| #: and accept only legacy Base64(hex(HMAC)): opentdf/platform#2095 introduced | ||
| #: the bug, opentdf/platform#4223 fixed it. | ||
| PLATFORM_SPEC_POLICY_BINDING_BUG = (0, 5, 3) | ||
| PLATFORM_SPEC_POLICY_BINDING_FIX = (0, 29, 1) |
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| #: Platform releases in [BUG, FIX) reject the spec's Base64(HMAC) policy binding | |
| #: and accept only legacy Base64(hex(HMAC)): opentdf/platform#2095 introduced | |
| #: the bug, opentdf/platform#4223 fixed it. | |
| PLATFORM_SPEC_POLICY_BINDING_BUG = (0, 5, 3) | |
| PLATFORM_SPEC_POLICY_BINDING_FIX = (0, 29, 1) | |
| #: Platform 0.5.3 introduced a bug that rejects the spec's Base64(HMAC) policy binding | |
| #: and accepts only legacy Base64(hex(HMAC)); 0.29.1 and later include a fix. | |
| #: opentdf/platform#2095 introduced the bug | |
| #: opentdf/platform#4223 fixed it | |
| PLATFORM_SPEC_POLICY_BINDING_BUG = (0, 5, 3) | |
| PLATFORM_SPEC_POLICY_BINDING_FIX = (0, 29, 1) |
2 of 3 tasks
KAS must accept a policy binding in the spec's Base64(HMAC) form as well as the legacy Base64(hex(HMAC)) every SDK writes. No released KAS did (opentdf/platform#2095 compared an untrimmed buffer); fixed in opentdf/platform#4223. test_tdf_with_spec_policy_binding re-encodes the binding to the spec form, which needs no key, and expects decrypt to succeed. It is gated on the new platform-only feature spec_policy_binding, force-only until a release carries the fix. test_tdf_with_altered_spec_policy_binding expects a well-formed spec binding with a wrong HMAC to be rejected, so the new path cannot fail open. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Signed-off-by: Paul Flynn <pflynn-virtru@users.noreply.github.com>
The point is to show that a real KAS -- the current release and main -- rejects an on-spec policy binding. A force-only gate skipped exactly those cells, so drop it. The test fails until a platform carrying opentdf/platform#4223 is under test. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Signed-off-by: Paul Flynn <pflynn-virtru@users.noreply.github.com>
change_policy_binding stored str(bytes) -- the literal "b'...'" -- so test_tdf_with_altered_policy_binding sent invalid base64 and only showed that KAS rejects a malformed binding, never that it checks the HMAC. Flip a bit of the HMAC instead and re-encode in the binding's own form, so a legacy hex binding stays well-formed hex. The spec-form tamper helper now reuses it. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Signed-off-by: Paul Flynn <pflynn-virtru@users.noreply.github.com>
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Signed-off-by: Paul Flynn <pflynn-virtru@users.noreply.github.com>
Platform releases from opentdf/platform#2095 (v0.5.3) until #4223 reject a Base64(HMAC) policy binding. Against those, assert the decrypt fails with a KAS error instead of failing the cell, keyed on PLATFORM_TAG since a source build reports the last release's PLATFORM_VERSION. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Signed-off-by: Paul Flynn <pflynn-virtru@users.noreply.github.com>
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Signed-off-by: Paul Flynn <pflynn-virtru@users.noreply.github.com>
Signed-off-by: Paul Flynn <pflynn-virtru@users.noreply.github.com> Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Covers hexless policy bindings,
Base64(HMAC), the form the TDF spec defines. Released KAS from opentdf/platform v0.5.3 until opentdf/platform#4223 only accept the legacyBase64(hex(HMAC)).test_tdf_with_hexless_policy_binding: rewrites a normal TDF's bindings to the hexless form. On platforms in the affected range it expects a KAS rejection; elsewhere it expects decrypt to succeed. The range is detected fromPLATFORM_TAG, because source builds report a stale version.test_tdf_with_altered_hexless_policy_binding: a wrong HMAC in the hexless form is rejected.test_tdf_with_altered_policy_bindingnow flips an HMAC bit and keeps the encoding well-formed. Before, it produced a malformed binding, so the test passed on the format check rather than the HMAC check.Helpers and tests are named for the format (
hexless), matching the SDK opt-ins (WithHexlessPolicyBinding, opentdf/platform#4232). A follow-up (#600) adjusts the decrypt expectation for SDK readers that re-encode hexless bindings.🤖 Generated with Claude Code
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