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fix(config)!: refuse a malformed deployment UUID at load without quoting it (LAB-8772) - #570
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…ing it CACHEKIT_DEPLOYMENT_UUID had no validator, so any string loaded, printed in the settings' repr/str/get_safe_repr(), and was quoted, with Python's own parse error, in the ConfigurationError raised when an encrypting cache was built. A master key pasted into the wrong variable ended up in logs (CWE-532). The setting now refuses what uuid.UUID() refuses, at load and on assignment, and returns every other value unchanged, so each deployment that encrypts today derives the same tenant. The handler's message for the deployment_uuid= parameter names its source only and has no exception chained to it. BREAKING CHANGE: a CACHEKIT_DEPLOYMENT_UUID that does not parse as a UUID now fails when cachekit loads its settings (at import), in any process, including one that never encrypts. It used to fail only when an encrypting cache was built.
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Summary by CodeRabbit
WalkthroughSettings now validate deployment UUID values. Tenant resolution accepts parseable UUID forms and uses the default tenant when the setting is absent or empty. Handler errors identify the invalid UUID source without quoting the value or retaining the parser exception as context. ChangesDeployment UUID handling
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Merge Risk: ⚪ Minimal · up to Malformed UUID settings now fail early, while errors avoid echoing rejected values. The documentation explains that valid UUIDs may appear in logs and warns against using secrets as deployment UUIDs; no merge-blocking risk remains. Pre-merge checks |
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| Check name | Status | Explanation | Resolution |
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Docstring coverage is 52.94% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 17 functions across 4 files. (2 skipped: … | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation 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. Title check The title clearly identifies the main change: rejecting malformed deployment UUIDs during configuration load without exposing the value. Description check The description is detailed and covers the motivation, breaking behaviour, implementation, tests, security impact, and documentation. It does not reproduce the template headings or explicitly complete…
Full details: Docstring Coverage
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Docstring coverage is 52.94% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 17 functions across 4 files. (2 skipped: 2 unsupported.)
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Inline comments:
Review comments at @docs/error-codes.md:
- Line 666: Update the logging assurance in the deployment_uuid documentation to
state that rejected values are omitted from the error messages, rather than
implying all supplied values are excluded from logs; add a warning not to use a
secret as a deployment UUID.
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📒 Files selected for processing (7)
SECURITY.mddocs/configuration.mddocs/error-codes.mdsrc/cachekit/cache_handler.pysrc/cachekit/config/settings.pytests/unit/config/test_redacting_settings.pytests/unit/test_single_tenant_mode.py
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…riable Also trims the validator docstring and drops two tests that duplicate existing coverage.
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A value that parses as a UUID is a tenant name, not a secret: it shows in the settings repr and in the single-tenant INFO log. Any 32 hex digits parse, so say so and warn against setting a secret there.
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CACHEKIT_DEPLOYMENT_UUIDhad no validator. Any string loaded, showed up in the settings'repr,strandget_safe_repr(), and was quoted, together with Python's own UUID parse error (which quotes it too), in theConfigurationErrorraised when an encrypting cache was built. A master key pasted into the wrong variable therefore ended up in logs and error trackers (CWE-532).Change
CachekitConfig.deployment_uuidgets a field validator. It refuses exactly whatuuid.UUID()refuses, at load and on assignment toget_settings(), and returns every other value unchanged. The value is a key-derivation input, so nothing is narrowed or rewritten: upper case, braces,urn:uuid:and unhyphenated forms still load byte-identical and derive the same tenant in auto mode, and interop mode still refuses a non-canonical form.Noneand""still mean unset (the protocol literal"default"). The message names the field, never the value, and is raised outside theexcept, so the parse error is not its__context__.deployment_uuid=parameter is nowInvalid deployment_uuid parameter (must be valid UUID), with no value and no chained exception.Behaviour change (breaking)
A
CACHEKIT_DEPLOYMENT_UUIDthat does not parse as a UUID now fails when cachekit loads its settings, whichimport cachekitdoes. That applies to every process, including one that never encrypts, as it already does for any other malformedCACHEKIT_variable. Before this change it failed only when an encrypting cache was built.Tests
tests/unit/test_single_tenant_mode.py: a table of accepted forms (load and assignment unchanged, same tenant asstr(uuid.UUID(value))), the interop canonical-form refusal per non-canonical form, unset and empty values, and refused forms at load and on assignment, where a refused assignment leaves the setting unchanged.tests/unit/config/test_redacting_settings.py: a non-repeating 64-hex key as the deployment UUID through the environment (constructor,from_env(),get_settings()), through assignment (a new row in the existing assignment-refusal table, which also runs the frame-locals checks), and through thedeployment_uuid=parameter. The env and assignment routes assert that no 16-character window of the key appears instr(),errors()orjson()and that no frame local below the caller holds it. The parameter route asserts the message carries no window of the key and that nothing is chained to it; frame locals on that route hold the caller's own argument and are out of scope here.Docs:
docs/configuration.md,docs/error-codes.md(new Invalid deployment UUID entry) andSECURITY.md. Companion docs-site change: cachekit-io/docs#171.Closes LAB-8772