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Posted to notifications@accumulo.apache.org by "William Slacum (JIRA)" <ji...@apache.org> on 2016/02/11 08:40:18 UTC
[jira] [Created] (ACCUMULO-4140) SecurityOperation checks for root
usernames fail when using Kerberos
William Slacum created ACCUMULO-4140:
----------------------------------------
Summary: SecurityOperation checks for root usernames fail when using Kerberos
Key: ACCUMULO-4140
URL: https://issues.apache.org/jira/browse/ACCUMULO-4140
Project: Accumulo
Issue Type: Bug
Components: core
Affects Versions: 1.7.0
Reporter: William Slacum
Assignee: William Slacum
Priority: Blocker
Fix For: 1.7.1
I'm currently extending the {{KerberosAuthenticator}}, since {{SecurityOperation}} depends on it for a few checks (see uses of {{SecurityOperation#isKerberos}}). I relied on {{KerberosAuthenticator#initializeSecurity}} to create the root user's ZooKeeper entry for me. When the KerberosAuthenticator creates principals, it base64 encodes them. This causes the root entry under {{/accumulo/instance/users}} to also be base64 encoded.
In a few spots, {{SecurityOperation}} will try to short circuit things by checking if the user has the root user name. This will fail because the principal will be in plain-form (ie, {{root@EXAMPLE.COM}}), and the data from ZooKeeper is base-64 encoded.
This opens up a security hole where the root user can have its permissions altered. I had a small test where I created a new user, gave it {{SystemPermission.GRANT}}, then revoked the root user's ability to create a table (this is explicitly disallowed in {{SecurityOperation#canRevokeSystem}}).
Test:
{code}
"Accumulo" should "revoke app2's attempt to modify the root user" in {
val root = UserGroupInformation.loginUserFromKeytabAndReturnUGI("root@EXAMPLE.COM", kdc.getRootUser.getKeytab.getAbsolutePath)
val con = accumulo.getConnector(root.getUserName, new KerberosToken)
con.securityOperations.grantSystemPermission(app1.getUserName, SystemPermission.GRANT)
doAs(app1, () => {
val con = accumulo.getConnector(app1.getUserName, new KerberosToken)
con.securityOperations.revokeSystemPermission(root.getUserName, SystemPermission.CREATE_TABLE)
})
// this will now throw an error
con.tableOperations.create("hopefully_I_can_create_ this")
}
{code}
Output:
{noformat}
- should revoke app2's attempt to modify the root user *** FAILED ***
org.apache.accumulo.core.client.AccumuloSecurityException: Error PERMISSION_DENIED for user root@EXAMPLE.COM on table hopefully_I_can_create_this(?) - User does not have permission to perform this action
at org.apache.accumulo.core.client.impl.TableOperationsImpl.doFateOperation(TableOperationsImpl.java:285)
at org.apache.accumulo.core.client.impl.TableOperationsImpl.doFateOperation(TableOperationsImpl.java:261)
at org.apache.accumulo.core.client.impl.TableOperationsImpl.doTableFateOperation(TableOperationsImpl.java:1427)
at org.apache.accumulo.core.client.impl.TableOperationsImpl.create(TableOperationsImpl.java:188)
at org.apache.accumulo.core.client.impl.TableOperationsImpl.create(TableOperationsImpl.java:155)
at KerbSpec$$anonfun$8.apply$mcV$sp(ServerTest.scala:131)
at KerbSpec$$anonfun$8.apply(ServerTest.scala:122)
at KerbSpec$$anonfun$8.apply(ServerTest.scala:122)
at org.scalatest.Transformer$$anonfun$apply$1.apply$mcV$sp(Transformer.scala:22)
at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85)
...
Cause: org.apache.accumulo.core.client.impl.thrift.ThriftSecurityException:
at org.apache.accumulo.core.master.thrift.FateService$executeFateOperation_result$executeFateOperation_resultStandardScheme.read(FateService.java:3129)
at org.apache.accumulo.core.master.thrift.FateService$executeFateOperation_result$executeFateOperation_resultStandardScheme.read(FateService.java:3115)
at org.apache.accumulo.core.master.thrift.FateService$executeFateOperation_result.read(FateService.java:3057)
at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:78)
at org.apache.accumulo.core.master.thrift.FateService$Client.recv_executeFateOperation(FateService.java:146)
at org.apache.accumulo.core.master.thrift.FateService$Client.executeFateOperation(FateService.java:127)
at org.apache.accumulo.core.client.impl.TableOperationsImpl.executeFateOperation(TableOperationsImpl.java:217)
at org.apache.accumulo.core.client.impl.TableOperationsImpl.doFateOperation(TableOperationsImpl.java:270)
at org.apache.accumulo.core.client.impl.TableOperationsImpl.doFateOperation(TableOperationsImpl.java:261)
at org.apache.accumulo.core.client.impl.TableOperationsImpl.doTableFateOperation(TableOperationsImpl.java:1427)
...
{noformat}
I'm reasonably certain the that the fix is to just have the {{KerberosAuthenticator}} not base64 encode the root principal when {{initializeSecurity}} is called.
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