walterddr commented on a change in pull request #10891:
[FLINK-15561][Security][hotfix] Add Delegation Token checker in
YarnClusterDescriptor
URL: https://github.com/apache/flink/pull/10891#discussion_r376642304
##########
File path:
flink-filesystems/flink-hadoop-fs/src/main/java/org/apache/flink/runtime/util/HadoopUtils.java
##########
@@ -112,6 +112,27 @@ public static Configuration
getHadoopConfiguration(org.apache.flink.configuratio
return result;
}
+ public static boolean isCredentialsConfigured(boolean useTicketCache)
throws Exception {
+ UserGroupInformation loginUser =
UserGroupInformation.getCurrentUser();
Review comment:
Hmm. I might be zeroing in on this problem. Although the
[documentation](https://hadoop.apache.org/docs/r2.8.3/api/org/apache/hadoop/security/UserGroupInformation.html)
is pretty vague --> seems like `getLoginUser` returns the actual user logged
in via keytab or ticket; and `getCurrentUser` return the actual user (login, or
the impersonated user via delegation token).
In short, say I am logged in as userA and then use a `UGI.doAs` section as a
proxy userB. inside the `doAs` section. getLoginUser returns userA and
getCurrentUser returns userB.. This might be the cause of the delegation token
based security problem -- it might result in UGI differences
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