Quanlong Huang created IMPALA-10192:
---------------------------------------
Summary: IllegalStateException in processing column masking audit
events
Key: IMPALA-10192
URL: https://issues.apache.org/jira/browse/IMPALA-10192
Project: IMPALA
Issue Type: Bug
Reporter: Quanlong Huang
Users reported an IllegalStateException about column masking. I can reproduce
it in the master branch:
{code:java}
I0925 21:42:09.684499 20809 jni-util.cc:288] ed44b3c5ca4a0e7d:8c4e884400000000]
java.lang.IllegalStateException
at
com.google.common.base.Preconditions.checkState(Preconditions.java:492)
at
org.apache.impala.authorization.ranger.RangerAuthorizationContext.stashAuditEvents(RangerAuthorizationContext.java:71)
at
org.apache.impala.authorization.ranger.RangerAuthorizationChecker.postAnalyze(RangerAuthorizationChecker.java:373)
at
org.apache.impala.analysis.AnalysisContext.analyzeAndAuthorize(AnalysisContext.java:440)
at
org.apache.impala.service.Frontend.doCreateExecRequest(Frontend.java:1562)
at
org.apache.impala.service.Frontend.getTExecRequest(Frontend.java:1529)
at
org.apache.impala.service.Frontend.createExecRequest(Frontend.java:1499)
at
org.apache.impala.service.JniFrontend.createExecRequest(JniFrontend.java:162)
{code}
*Reproducing*
Start Impala cluster with Ranger authz enabled
{code:java}
bin/start-impala-cluster.py --impalad_args="--server-name=server1
--ranger_service_type=hive --ranger_app_id=impala
--authorization_provider=ranger" --catalogd_args="--server-name=server1
--ranger_service_type=hive --ranger_app_id=impala
--authorization_provider=ranger"
{code}
Create a tmp table using your username.
{code:java}
$ bin/impala-shell.sh
[localhost:21050] default> create table tmp_tbl (id int, name string) stored as
parquet;
{code}
Open the Ranger WebUI at [http://localhost:6080/]. Add two column masking
policies
* Masking default.tmp_tbl.id using HASH for user "non_owner"
* Masking default.tmp_tbl.name using REDACT for your username (quanlong in my
case)
Refresh the policies in impala and query the table using your username.
{code:java}
bin/impala-shell.sh -u admin -q "refresh authorization"
bin/impala-shell.sh -q "select * from tmp_tbl"
{code}
The last query will fail with "ERROR: IllegalStateException: null".
*Clues*
In RangerAuthorizationContext.stashAuditEvents(), we deduplicate the column
masking audit events. There is a Precondition check that all events generated
are column masking events:
[https://github.com/apache/impala/blob/5c69e7ba583297dc886652ac5952816882b928af/fe/src/main/java/org/apache/impala/authorization/ranger/RangerAuthorizationContext.java#L71]
Codes:
{code:java}
public void stashAuditEvents(RangerImpalaPlugin plugin) {
Set<String> unfilteredMaskNames = plugin.getUnfilteredMaskNames(
Arrays.asList("MASK_NONE"));
for (AuthzAuditEvent event : auditHandler_.getAuthzEvents()) {
// We assume that all the logged events until now are column
masking-related. Since
// we remove those AuthzAuditEvent's corresponding to the "Unmasked"
policy of type
// "MASK_NONE", we exclude this type of mask.
Preconditions.checkState(unfilteredMaskNames
.contains(event.getAccessType().toUpperCase()));
// event.getEventKey() is the concatenation of the following fields in an
// AuthzAuditEvent: 'user', 'accessType', 'resourcePath', 'resourceType',
'action',
// 'accessResult', 'sessionId', and 'clientIP'. Recall that
'resourcePath' is the
// concatenation of 'dbName', 'tableName', and 'columnName' that were
used to
// instantiate a RangerAccessResourceImpl in order to create a
RangerAccessRequest
// to call RangerImpalaPlugin#evalDataMaskPolicies(). Refer to
// RangerAuthorizationChecker#evalColumnMask() for further details.
deduplicatedAuditEvents_.put(event.getEventKey(), event);
}
auditHandler_.getAuthzEvents().clear();
}
{code}
However, it's possible that some SELECT events are generated during the
analyzing phase at here:
[https://github.com/apache/impala/blob/5c69e7ba583297dc886652ac5952816882b928af/fe/src/main/java/org/apache/impala/authorization/ranger/RangerAuthorizationChecker.java#L308]
Looks like if there is a column masking policy on a column and the policy
doesn't target to the current user, Ranger plugin will generate a SELECT audit
event. In this case, the first masking policy is on "id" column for user
"non_owner". Then we get a SELECT event on this column. The second masking
policy is on "name" column for the current user. We get a mask event as we
expected.
We should deal with these non mask events correctly. On the other hand, we
should replace all Precondition checks on the audit code paths with error
loggings, since these should not fail a query.
cc [~fangyurao]
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