[jira] [Created] (KNOX-2527) Support HMAC signature/verification in JWT tokens

["Sandor Molnar (Jira)" <ji...@apache.org>]

Sandor Molnar created KNOX-2527:
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             Summary: Support HMAC signature/verification in JWT tokens
                 Key: KNOX-2527
                 URL: https://issues.apache.org/jira/browse/KNOX-2527
             Project: Apache Knox
          Issue Type: New Feature
          Components: KnoxSSO, Server
    Affects Versions: 1.5.0
            Reporter: Sandor Molnar
            Assignee: Sandor Molnar
             Fix For: 1.6.0


As of now, in {{DefaultTokenAuthorityService}}, the generated JWT token is signed by RSA (PKI). It would be beneficial to add support for HMAC as well so that token signature/verification would not require a keystore being set but using a secret stored via Knox's alias service. The recommended alias name is {{gateway.signing.hmac.secret}}
 To support backward compatibility, the implementation should use HMAC signature/verification only if:
 - the HMAC secret is configured via the alias service for the gateway
 - there is no previously pre-configured {{gateway.signing.keystore.name}} which is a clear indication of end-user preference of using PKI signatures.

The default HMAC algorithm would be {{HS256}} (HMAC using SHA-256 hash algorithm), but this might be overridden by the already existing request parameter called {{knoxsso.token.sigalg}}. Other valid values are:
 - {{HS384}}
 - {{HS512}}



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