TDF Policy Data Attributes are case sensitive

[imdominicreed]

TDF Policy Data Attributes seem to be case sensitive and do not get normalized to lower case when doing a keyRewrap, and authorization of getDecision.

If the TDF Policy Data Attributes is created with cases (example being: https://example.com/attr/Caps/value/Bad), the request will get denied even if the user is entitled with https://example.com/attr/caps/value/bad.

Steps to Reproduce:

1. Encrypt a TDF with an attribute that contains cases like https://example.com/attr/Caps/value/Bad.
2. Entitle a user with that attribute cases by creating a subject mapping, shouldn't matter I believe, and should be normalized down. Tested with OTDFCTL.
3. Decrypt the TDF and the request hitting Platform has the attributes with cases. (I am on an older version of SDK) so it could be possible that the new version of SDK cleans this up. But server-side should catch this in case a user is doing RPC call rather than using the sdk.

The request should be a denied by Platform.

[jrschumacher]

Verified that we have a test in the policy so we can focus on GetDecision or the SubjectMapping https://github.com/opentdf/platform/blob/main/service/integration/attribute_fqns_test.go#L136-L159

[jrschumacher]

Need to update these to use strings.EqualFold()

Code:

platform/service/internal/access/pdp.go

Line 372 in e6c76ee

func getIsValueFoundInFqnValuesSet(v *policy.Value, fqns []string, l *logger.Logger) bool {