[HADOOP-13316] Enforce Kerberos authentication for required ops in DelegationTokenAuthenticator

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 2.6.0
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Component/s: kms, security
• Target Version/s: 2.8.0
• Assignee: Xiao Chen
• Reporter: Xiao Chen
• Created: 24/Jun/16 03:26
• Updated: 30/Aug/16 01:13
• Resolved: 28/Jun/16 01:47

Description

Delegation tokens are supposed to be exchanged in a secure authentication, for security concerns.
For example, HDFS only distribute or renew a delegation token under kerberos authentication

DelegationTokenAuthenticationHandler used by KMS + HTTPFS doesn't follow this now, and poses security concerns. Details in comments.