diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/UserGroupInformation.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/UserGroupInformation.java index d37da72192d..dcee9f4bc25 100644 --- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/UserGroupInformation.java +++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/UserGroupInformation.java @@ -1233,7 +1233,29 @@ public class UserGroupInformation { reloginFromKeytab(false); } + /** + * Force re-Login a user in from a keytab file irrespective of the last login + * time. Loads a user identity from a keytab file and logs them in. They + * become the currently logged-in user. This method assumes that + * {@link #loginUserFromKeytab(String, String)} had happened already. The + * Subject field of this UserGroupInformation object is updated to have the + * new credentials. + * + * @throws IOException + * @throws KerberosAuthException on a failure + */ + @InterfaceAudience.Public + @InterfaceStability.Evolving + public void forceReloginFromKeytab() throws IOException { + reloginFromKeytab(false, true); + } + private void reloginFromKeytab(boolean checkTGT) throws IOException { + reloginFromKeytab(checkTGT, false); + } + + private void reloginFromKeytab(boolean checkTGT, boolean ignoreLastLoginTime) + throws IOException { if (!shouldRelogin() || !isFromKeytab()) { return; } @@ -1248,7 +1270,7 @@ public class UserGroupInformation { return; } } - relogin(login); + relogin(login, ignoreLastLoginTime); } /** @@ -1269,25 +1291,27 @@ public class UserGroupInformation { if (login == null) { throw new KerberosAuthException(MUST_FIRST_LOGIN); } - relogin(login); + relogin(login, false); } - private void relogin(HadoopLoginContext login) throws IOException { + private void relogin(HadoopLoginContext login, boolean ignoreLastLoginTime) + throws IOException { // ensure the relogin is atomic to avoid leaving credentials in an // inconsistent state. prevents other ugi instances, SASL, and SPNEGO // from accessing or altering credentials during the relogin. synchronized(login.getSubjectLock()) { // another racing thread may have beat us to the relogin. if (login == getLogin()) { - unprotectedRelogin(login); + unprotectedRelogin(login, ignoreLastLoginTime); } } } - private void unprotectedRelogin(HadoopLoginContext login) throws IOException { + private void unprotectedRelogin(HadoopLoginContext login, + boolean ignoreLastLoginTime) throws IOException { assert Thread.holdsLock(login.getSubjectLock()); long now = Time.now(); - if (!hasSufficientTimeElapsed(now)) { + if (!hasSufficientTimeElapsed(now) && !ignoreLastLoginTime) { return; } // register most recent relogin attempt diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestUGILoginFromKeytab.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestUGILoginFromKeytab.java index d233234c26c..db0095f2171 100644 --- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestUGILoginFromKeytab.java +++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestUGILoginFromKeytab.java @@ -158,6 +158,42 @@ public class TestUGILoginFromKeytab { Assert.assertNotSame(login1, login2); } + /** + * Force re-login from keytab using the MiniKDC and verify the UGI can + * successfully relogin from keytab as well. + */ + @Test + public void testUGIForceReLoginFromKeytab() throws Exception { + // Set this to false as we are testing force re-login anyways + UserGroupInformation.setShouldRenewImmediatelyForTests(false); + String principal = "foo"; + File keytab = new File(workDir, "foo.keytab"); + kdc.createPrincipal(keytab, principal); + + UserGroupInformation.loginUserFromKeytab(principal, keytab.getPath()); + UserGroupInformation ugi = UserGroupInformation.getLoginUser(); + Assert.assertTrue("UGI should be configured to login from keytab", + ugi.isFromKeytab()); + + // Verify relogin from keytab. + User user = getUser(ugi.getSubject()); + final long firstLogin = user.getLastLogin(); + final LoginContext login1 = user.getLogin(); + Assert.assertNotNull(login1); + + // Sleep for 2 secs to have a difference between first and second login + Thread.sleep(2000); + + // Force relogin from keytab + ugi.forceReloginFromKeytab(); + final long secondLogin = user.getLastLogin(); + final LoginContext login2 = user.getLogin(); + Assert.assertTrue("User should have been able to relogin from keytab", + secondLogin > firstLogin); + Assert.assertNotNull(login2); + Assert.assertNotSame(login1, login2); + } + @Test public void testGetUGIFromKnownSubject() throws Exception { KerberosPrincipal principal = new KerberosPrincipal("user");