YARN-1115: Provide optional means for a scheduler to check real user ACLs. Contributed by Eric Payne (epayne)

This commit is contained in:
Ahmed Hussein 2021-10-21 17:04:29 +00:00
parent bd077c3814
commit 742d88b1c6
15 changed files with 284 additions and 20 deletions

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@ -597,10 +597,12 @@ public SubmitApplicationResponse submitApplication(
// checked here, those that are dependent on RM configuration are validated
// in RMAppManager.
UserGroupInformation userUgi = null;
String user = null;
try {
// Safety
user = UserGroupInformation.getCurrentUser().getShortUserName();
userUgi = UserGroupInformation.getCurrentUser();
user = userUgi.getShortUserName();
} catch (IOException ie) {
LOG.warn("Unable to get the current user.", ie);
RMAuditLogger.logFailure(user, AuditConstants.SUBMIT_APP_REQUEST,
@ -691,7 +693,7 @@ public SubmitApplicationResponse submitApplication(
try {
// call RMAppManager to submit application directly
rmAppManager.submitApplication(submissionContext,
System.currentTimeMillis(), user);
System.currentTimeMillis(), userUgi);
LOG.info("Application with id " + applicationId.getId() +
" submitted by user " + user);

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@ -352,16 +352,26 @@ protected synchronized void checkAppNumCompletedLimit() {
}
}
@SuppressWarnings("unchecked")
@VisibleForTesting
@Deprecated
protected void submitApplication(
ApplicationSubmissionContext submissionContext, long submitTime,
String user) throws YarnException {
submitApplication(submissionContext, submitTime,
UserGroupInformation.createRemoteUser(user));
}
@VisibleForTesting
@SuppressWarnings("unchecked")
protected void submitApplication(
ApplicationSubmissionContext submissionContext, long submitTime,
UserGroupInformation userUgi) throws YarnException {
ApplicationId applicationId = submissionContext.getApplicationId();
// Passing start time as -1. It will be eventually set in RMAppImpl
// constructor.
RMAppImpl application = createAndPopulateNewRMApp(
submissionContext, submitTime, user, false, -1, null);
submissionContext, submitTime, userUgi, false, -1, null);
try {
if (UserGroupInformation.isSecurityEnabled()) {
this.rmContext.getDelegationTokenRenewer()
@ -394,11 +404,21 @@ protected void recoverApplication(ApplicationStateData appState,
ApplicationSubmissionContext appContext =
appState.getApplicationSubmissionContext();
ApplicationId appId = appContext.getApplicationId();
UserGroupInformation userUgi = null;
if (appState.getRealUser() != null) {
UserGroupInformation realUserUgi = null;
realUserUgi =
UserGroupInformation.createRemoteUser(appState.getRealUser());
userUgi = UserGroupInformation.createProxyUser(appState.getUser(),
realUserUgi);
} else {
userUgi = UserGroupInformation.createRemoteUser(appState.getUser());
}
// create and recover app.
RMAppImpl application =
createAndPopulateNewRMApp(appContext, appState.getSubmitTime(),
appState.getUser(), true, appState.getStartTime(),
userUgi, true, appState.getStartTime(),
appState.getState());
application.handle(new RMAppRecoverEvent(appId, rmState));
@ -406,8 +426,9 @@ protected void recoverApplication(ApplicationStateData appState,
private RMAppImpl createAndPopulateNewRMApp(
ApplicationSubmissionContext submissionContext, long submitTime,
String user, boolean isRecovery, long startTime,
UserGroupInformation userUgi, boolean isRecovery, long startTime,
RMAppState recoveredFinalState) throws YarnException {
String user = userUgi.getShortUserName();
ApplicationPlacementContext placementContext = null;
if (recoveredFinalState == null) {
@ -431,7 +452,6 @@ private RMAppImpl createAndPopulateNewRMApp(
// Verify and get the update application priority and set back to
// submissionContext
UserGroupInformation userUgi = UserGroupInformation.createRemoteUser(user);
// Application priority needed to be validated only while submitting. During
// recovery, validated priority could be recovered from submission context.
@ -503,7 +523,7 @@ private RMAppImpl createAndPopulateNewRMApp(
// Create RMApp
RMAppImpl application =
new RMAppImpl(applicationId, rmContext, this.conf,
submissionContext.getApplicationName(), user,
submissionContext.getApplicationName(), userUgi,
submissionContext.getQueue(),
submissionContext, this.scheduler, this.masterService,
submitTime, submissionContext.getApplicationType(),

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@ -937,7 +937,8 @@ public void storeNewApplication(RMApp app) {
assert context instanceof ApplicationSubmissionContextPBImpl;
ApplicationStateData appState =
ApplicationStateData.newInstance(app.getSubmitTime(),
app.getStartTime(), context, app.getUser(), app.getCallerContext());
app.getStartTime(), context, app.getUser(), app.getRealUser(),
app.getCallerContext());
appState.setApplicationTimeouts(app.getApplicationTimeouts());
getRMStateStoreEventHandler().handle(new RMStateStoreAppEvent(appState));
}
@ -1170,7 +1171,7 @@ public void removeApplication(RMApp app) {
ApplicationStateData appState =
ApplicationStateData.newInstance(app.getSubmitTime(),
app.getStartTime(), app.getApplicationSubmissionContext(),
app.getUser(), app.getCallerContext());
app.getUser(), app.getRealUser(), app.getCallerContext());
for(RMAppAttempt appAttempt : app.getAppAttempts().values()) {
appState.attempts.put(appAttempt.getAppAttemptId(), null);
}

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@ -92,9 +92,46 @@ public static ApplicationStateData newInstance(long submitTime,
public static ApplicationStateData newInstance(long submitTime,
long startTime, ApplicationSubmissionContext context, String user) {
return newInstance(submitTime, startTime, context, user, null);
return newInstance(submitTime, startTime, context, user,
(CallerContext) null);
}
public static ApplicationStateData newInstance(long submitTime,
long startTime, String user, String realUser,
ApplicationSubmissionContext submissionContext, RMAppState state,
String diagnostics, long launchTime, long finishTime,
CallerContext callerContext) {
ApplicationStateData appState =
newInstance(submitTime, startTime, user, submissionContext, state,
diagnostics, launchTime, finishTime, callerContext);
if (realUser != null) {
appState.setRealUser(realUser);
}
return appState;
}
public static ApplicationStateData newInstance(long submitTime,
long startTime, String user, String realUser,
ApplicationSubmissionContext submissionContext, RMAppState state,
String diagnostics, long launchTime, long finishTime,
CallerContext callerContext,
Map<ApplicationTimeoutType, Long> applicationTimeouts) {
ApplicationStateData appState =
newInstance(submitTime, startTime, user, submissionContext, state,
diagnostics, launchTime, finishTime, callerContext, applicationTimeouts);
if (realUser != null) {
appState.setRealUser(realUser);
}
return appState;
}
public static ApplicationStateData newInstance(long submitTime,
long startTime, ApplicationSubmissionContext context, String user,
String realUser, CallerContext callerContext) {
return newInstance(submitTime, startTime, user, realUser, context, null, "",
0, 0, callerContext);
}
public int getAttemptCount() {
return attempts.size();
}
@ -213,4 +250,8 @@ public abstract void setApplicationSubmissionContext(
@Public
public abstract void setApplicationTimeouts(
Map<ApplicationTimeoutType, Long> applicationTimeouts);
public abstract String getRealUser();
public abstract void setRealUser(String realUser);
}

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@ -148,7 +148,22 @@ public void setUser(String user) {
maybeInitBuilder();
builder.setUser(user);
}
@Override
public String getRealUser() {
ApplicationStateDataProtoOrBuilder p = viaProto ? proto : builder;
if (!p.hasRealUser()) {
return null;
}
return (p.getRealUser());
}
@Override
public void setRealUser(String realUser) {
maybeInitBuilder();
builder.setRealUser(realUser);
}
@Override
public ApplicationSubmissionContext getApplicationSubmissionContext() {
ApplicationStateDataProtoOrBuilder p = viaProto ? proto : builder;

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@ -325,4 +325,6 @@ ApplicationReport createAndGetApplicationReport(String clientUserName,
* @return Map of envs related to application scheduling preferences.
*/
Map<String, String> getApplicationSchedulingEnvs();
String getRealUser();
}

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@ -133,6 +133,7 @@ public class RMAppImpl implements RMApp, Recoverable {
private final RMContext rmContext;
private final Configuration conf;
private final String user;
private final UserGroupInformation userUgi;
private final String name;
private final ApplicationSubmissionContext submissionContext;
private final Dispatcher dispatcher;
@ -420,7 +421,19 @@ public RMAppImpl(ApplicationId applicationId, RMContext rmContext,
String applicationType, Set<String> applicationTags,
List<ResourceRequest> amReqs, ApplicationPlacementContext
placementContext, long startTime) {
this(applicationId, rmContext, config, name,
(user != null ? UserGroupInformation.createRemoteUser(user) : null),
queue, submissionContext, scheduler, masterService, submitTime,
applicationType, applicationTags, amReqs, placementContext, startTime);
}
public RMAppImpl(ApplicationId applicationId, RMContext rmContext,
Configuration config, String name, UserGroupInformation userUgi,
String queue, ApplicationSubmissionContext submissionContext,
YarnScheduler scheduler, ApplicationMasterService masterService,
long submitTime, String applicationType, Set<String> applicationTags,
List<ResourceRequest> amReqs, ApplicationPlacementContext
placementContext, long startTime) {
this.systemClock = SystemClock.getInstance();
this.applicationId = applicationId;
@ -429,7 +442,9 @@ public RMAppImpl(ApplicationId applicationId, RMContext rmContext,
this.dispatcher = rmContext.getDispatcher();
this.handler = dispatcher.getEventHandler();
this.conf = config;
this.user = StringInterner.weakIntern(user);
this.user = StringInterner.weakIntern(
(userUgi != null) ? userUgi.getShortUserName() : null);
this.userUgi = userUgi;
this.queue = queue;
this.submissionContext = submissionContext;
this.scheduler = scheduler;
@ -1309,7 +1324,7 @@ private void rememberTargetTransitionsAndStoreState(RMAppEvent event,
ApplicationStateData appState =
ApplicationStateData.newInstance(this.submitTime, this.startTime,
this.user, this.submissionContext,
this.getUser(), this.getRealUser(), this.submissionContext,
stateToBeStored, diags, this.launchTime, this.storedFinishTime,
this.callerContext);
appState.setApplicationTimeouts(this.applicationTimeouts);
@ -1898,4 +1913,10 @@ long getLogAggregationStartTime() {
Clock getSystemClock() {
return systemClock;
}
@Override
public String getRealUser() {
UserGroupInformation realUserUgi = this.userUgi.getRealUser();
return (realUserUgi != null) ? realUserUgi.getShortUserName() : null;
}
}

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@ -883,6 +883,10 @@ private void addApplicationOnRecovery(ApplicationId applicationId,
} catch (AccessControlException ace) {
// Ignore the exception for recovered app as the app was previously
// accepted.
LOG.warn("AccessControlException received when trying to recover "
+ applicationId + " in queue " + queueName + " for user " + user
+ ". Since the app was in the queue prior to recovery, the Capacity"
+ " Scheduler will recover the app anyway.", ace);
}
queue.getMetrics().submitApp(user);
SchedulerApplication<FiCaSchedulerApp> application =
@ -2777,7 +2781,7 @@ public Priority updateApplicationPriority(Priority newPriority,
ApplicationStateData appState = ApplicationStateData.newInstance(
rmApp.getSubmitTime(), rmApp.getStartTime(),
rmApp.getApplicationSubmissionContext(), rmApp.getUser(),
rmApp.getCallerContext());
rmApp.getRealUser(), rmApp.getCallerContext());
appState.setApplicationTimeouts(rmApp.getApplicationTimeouts());
appState.setLaunchTime(rmApp.getLaunchTime());
rmContext.getStateStore().updateApplicationStateSynchronously(appState,

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@ -72,6 +72,7 @@ message ApplicationStateDataProto {
optional hadoop.common.RPCCallerContextProto caller_context = 8;
repeated ApplicationTimeoutMapProto application_timeouts = 9;
optional int64 launch_time = 10;
optional string real_user = 11;
}
message ApplicationAttemptStateDataProto {

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@ -19,6 +19,7 @@
package org.apache.hadoop.yarn.server.resourcemanager;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.apache.hadoop.yarn.api.records.ApplicationSubmissionContext;
import org.apache.hadoop.yarn.exceptions.YarnException;
@ -71,7 +72,7 @@ public void submitApplication(
ApplicationSubmissionContext submissionContext, String user)
throws YarnException {
super.submitApplication(submissionContext, System.currentTimeMillis(),
user);
UserGroupInformation.createRemoteUser(user));
}
public String getUserNameForPlacement(final String user,

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@ -26,6 +26,7 @@
import org.apache.hadoop.ha.HAServiceProtocol;
import org.apache.hadoop.ha.HAServiceProtocol.HAServiceState;
import org.apache.hadoop.ha.HAServiceProtocol.StateChangeRequestInfo;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.yarn.api.records.ApplicationSubmissionContext;
import org.apache.hadoop.yarn.conf.HAUtil;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
@ -169,7 +170,8 @@ public MyRMAppManager(RMContext context, YarnScheduler scheduler,
@Override
protected void submitApplication(
ApplicationSubmissionContext submissionContext, long submitTime,
String user) throws YarnException {
UserGroupInformation userUgi) throws YarnException {
String user = userUgi.getShortUserName();
//Do nothing, just add the application to RMContext
RMAppImpl application =
new RMAppImpl(submissionContext.getApplicationId(), this.rmContext,

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@ -68,6 +68,10 @@ public String getUser() {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public String getRealUser() {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public ApplicationSubmissionContext getApplicationSubmissionContext() {
throw new UnsupportedOperationException("Not supported yet.");

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@ -119,6 +119,11 @@ public String getUser() {
return user;
}
@Override
public String getRealUser() {
return null;
}
public void setUser(String user) {
this.user = user;
}

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@ -56,11 +56,15 @@
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.security.AccessControlException;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.authorize.AccessControlList;
import org.apache.hadoop.util.Time;
import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.apache.hadoop.yarn.api.records.ApplicationSubmissionContext;
import org.apache.hadoop.yarn.api.records.ContainerExitStatus;
import org.apache.hadoop.yarn.api.records.ContainerLaunchContext;
import org.apache.hadoop.yarn.api.records.ContainerState;
import org.apache.hadoop.yarn.api.records.ContainerStatus;
import org.apache.hadoop.yarn.api.records.NodeId;
@ -72,9 +76,13 @@
import org.apache.hadoop.yarn.api.records.Resource;
import org.apache.hadoop.yarn.api.records.ResourceRequest;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.exceptions.YarnException;
import org.apache.hadoop.yarn.factories.RecordFactory;
import org.apache.hadoop.yarn.factory.providers.RecordFactoryProvider;
import org.apache.hadoop.yarn.security.AccessType;
import org.apache.hadoop.yarn.server.resourcemanager.ApplicationMasterService;
import org.apache.hadoop.yarn.server.resourcemanager.MockRM;
import org.apache.hadoop.yarn.server.resourcemanager.RMAppManager;
import org.apache.hadoop.yarn.server.resourcemanager.RMContext;
import org.apache.hadoop.yarn.server.resourcemanager.nodelabels.RMNodeLabelsManager;
import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMApp;
@ -91,8 +99,10 @@
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.QueueStateManager;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceLimits;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceUsage;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.YarnScheduler;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.policy.FifoOrderingPolicyWithExclusivePartitions;
import org.apache.hadoop.yarn.server.scheduler.SchedulerRequestKey;
import org.apache.hadoop.yarn.server.security.ApplicationACLsManager;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.UsersManager.User;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.preemption.PreemptionManager;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.ResourceCommitRequest;
@ -4812,4 +4822,139 @@ public void tearDown() throws Exception {
cs.stop();
}
}
private static class TestRMAppManager extends RMAppManager {
TestRMAppManager(RMContext context, YarnScheduler scheduler,
ApplicationMasterService masterService,
ApplicationACLsManager applicationACLsManager, Configuration conf) {
super(context, scheduler, masterService, applicationACLsManager, conf);
}
@Override
public void submitApplication(
ApplicationSubmissionContext submissionContext, long submitTime,
UserGroupInformation userUgi) throws YarnException {
super.submitApplication(submissionContext, submitTime, userUgi);
}
}
@Test
public void testSubmitUsingRealUserAcls() throws Exception {
final String realUser = "AdminUser";
final String user0 = "user0";
final String user1 = "user1";
final String queue = "default";
YarnConfiguration conf = new YarnConfiguration();
MockRM rm = new MockRM();
rm.init(conf);
rm.start();
rm.getConfig().setBoolean(YarnConfiguration.YARN_ACL_ENABLE, true);
UserGroupInformation realUserUgi =
UserGroupInformation.createRemoteUser(realUser);
UserGroupInformation ugi0 =
UserGroupInformation.createProxyUserForTesting("user0", realUserUgi,
new String[] {"group1"});
UserGroupInformation ugi1 =
UserGroupInformation.createProxyUserForTesting("user1", realUserUgi,
new String[] {"group1"});
ApplicationId applicationId0 = TestUtils.getMockApplicationId(0);
ApplicationId applicationId1 = TestUtils.getMockApplicationId(1);
CapacityScheduler cSched = (CapacityScheduler) rm.getResourceScheduler();
ParentQueue rootQueue = (ParentQueue) cSched.getRootQueue();
Map<AccessType, AccessControlList> rootAcls = rootQueue.acls;
rootAcls.put(AccessType.SUBMIT_APP, new AccessControlList(realUser));
rootAcls.put(AccessType.ADMINISTER_QUEUE, new AccessControlList(realUser));
LeafQueue defaultQueue = (LeafQueue)cSched.getQueue(queue);
Map<AccessType, AccessControlList> a = defaultQueue.acls;
a.put(AccessType.SUBMIT_APP, new AccessControlList(realUser));
a.put(AccessType.ADMINISTER_QUEUE, new AccessControlList(realUser));
TestRMAppManager testRmAppManager =
new TestRMAppManager(rmContext, cSched, rm.getApplicationMasterService(),
rm.getApplicationACLsManager(), rm.getConfig());
ContainerLaunchContext clc =
mock(ContainerLaunchContext.class);
ApplicationSubmissionContext asc =
ApplicationSubmissionContext.newInstance(
applicationId0, "myApp0", "default", Priority.newInstance(0),
clc, false, false, 1, Resource.newInstance(1024, 1));
// Each of the following test cases has a proxied user and a real user.
// The proxied users are user0 and user1, depending on the test. The real
// user is always AdminUser.
// Ensure that user0 is not allowed to submit to the default queue when only
// the admin user is in the submit ACL and the admin user does not have the
// USE_REAL_ACLS character prepended.
try {
testRmAppManager.submitApplication(asc, System.currentTimeMillis(), ugi0);
Assert.fail(user0 + " should not be allowed to submit to the "
+ queue + " queue when only admin user is in submit ACL.");
} catch (YarnException e) {
// This is the expected behavior.
assertTrue("Should have received an AccessControlException.",
e.getCause() instanceof AccessControlException);
}
// With only user0 in the list of users authorized to submit apps to the
// queue, ensure that user0 is allowed to submit to the default queue.
a.put(AccessType.SUBMIT_APP, new AccessControlList(user0));
a.put(AccessType.ADMINISTER_QUEUE, new AccessControlList(realUser));
try {
testRmAppManager.submitApplication(asc, System.currentTimeMillis(), ugi0);
} catch (YarnException e) {
Assert.fail(user0 + " should be allowed to submit to the "
+ queue + " queue.");
}
// With only user0 in the list of users authorized to submit apps to the
// queue, ensure that user1 is NOT allowed to submit to the default queue
try {
testRmAppManager.submitApplication(asc, System.currentTimeMillis(), ugi1);
Assert.fail(user1 + " should not be allowed to submit to the "
+ queue + " queue.");
} catch (YarnException e) {
// This is the expected behavior.
assertTrue("Should have received an AccessControlException.",
e.getCause() instanceof AccessControlException);
}
// Even though the admin user is in the list of users allowed to submit to
// the default queue and user1's real user is the admin user, user1 should
// not be allowed to submit to queue because the ACL entry does not have the
// special character prepended in the list.
a.put(AccessType.SUBMIT_APP,
new AccessControlList(user0 + "," + realUser));
try {
testRmAppManager.submitApplication(asc, System.currentTimeMillis(), ugi1);
Assert.fail(user1 + " should not be allowed to submit to the "
+ queue + " queue.");
} catch (YarnException e) {
// This is the expected behavior.
assertTrue("Should have received an AccessControlException.",
e.getCause() instanceof AccessControlException);
}
// user1 should now be allowed to submit to the default queue because the
// admin user is in the ACL list and has the USE_REAL_ACLS character
// prepended.
a.put(AccessType.SUBMIT_APP,
new AccessControlList(user0 + ","
+ AccessControlList.USE_REAL_ACLS + realUser));
asc.setApplicationId(applicationId1);
try {
testRmAppManager.submitApplication(asc, System.currentTimeMillis(), ugi1);
} catch (YarnException e) {
LOG.error("failed to submit", e);
Assert.fail(user1 + " should be allowed to submit to the "
+ queue + " queue when real user is" + realUser + ".");
}
rm.stop();
rm.close();
}
}

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@ -167,8 +167,8 @@ Configuration
| Property | Description |
|:---- |:---- |
| `yarn.scheduler.capacity.<queue-path>.state` | The *state* of the queue. Can be one of `RUNNING` or `STOPPED`. If a queue is in `STOPPED` state, new applications cannot be submitted to *itself* or *any of its child queues*. Thus, if the *root* queue is `STOPPED` no applications can be submitted to the entire cluster. Existing applications continue to completion, thus the queue can be *drained* gracefully. Value is specified as Enumeration. |
| `yarn.scheduler.capacity.root.<queue-path>.acl_submit_applications` | The *ACL* which controls who can *submit* applications to the given queue. If the given user/group has necessary ACLs on the given queue or *one of the parent queues in the hierarchy* they can submit applications. *ACLs* for this property *are* inherited from the parent queue if not specified. |
| `yarn.scheduler.capacity.root.<queue-path>.acl_administer_queue` | The *ACL* which controls who can *administer* applications on the given queue. If the given user/group has necessary ACLs on the given queue or *one of the parent queues in the hierarchy* they can administer applications. *ACLs* for this property *are* inherited from the parent queue if not specified. |
| `yarn.scheduler.capacity.root.<queue-path>.acl_submit_applications` | The *ACL* which controls who can *submit* applications to the given queue. If the given user/group has necessary ACLs on the given queue or *one of the parent queues in the hierarchy* they can submit applications. *ACLs* for this property *are* inherited from the parent queue if not specified. If a tilde (~) is prepended to a user name in this list, the real user's ACLs will allow the proxied user to submit to the queue. |
| `yarn.scheduler.capacity.root.<queue-path>.acl_administer_queue` | The *ACL* which controls who can *administer* applications on the given queue. If the given user/group has necessary ACLs on the given queue or *one of the parent queues in the hierarchy* they can administer applications. *ACLs* for this property *are* inherited from the parent queue if not specified. If a tilde (~) is prepended to a user name in this list, the real user's ACLs will allow the proxied user to administer apps the queue. |
**Note:** An *ACL* is of the form *user1*,*user2* *space* *group1*,*group2*. The special value of * implies *anyone*. The special value of *space* implies *no one*. The default is * for the root queue if not specified.