bbende commented on a change in pull request #4095: NIFI-7018: Initial commit
of processors extending AbstractHadoopProce…
URL: https://github.com/apache/nifi/pull/4095#discussion_r385260904
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File path:
nifi-nar-bundles/nifi-extension-utils/nifi-hadoop-utils/src/main/java/org/apache/nifi/hadoop/SecurityUtil.java
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@@ -69,6 +79,37 @@ public static synchronized UserGroupInformation
loginKerberos(final Configuratio
return UserGroupInformation.getCurrentUser();
}
+ public static synchronized UserGroupInformation
loginKerberosWithPassword(final Configuration config, final String principal,
final String password) throws IOException {
+ Validate.notNull(config);
+ Validate.notNull(principal);
+ Validate.notNull(password);
+
+ KerberosPasswordUser kerberosPasswordUser = new
KerberosPasswordUser(principal, password);
+ return getUgiForKerberosUser(config, kerberosPasswordUser);
+ }
+
+ public static synchronized UserGroupInformation
getUgiForKerberosUser(final Configuration config, final KerberosUser
kerberosUser) throws IOException {
+ UserGroupInformation.setConfiguration(config);
+ try {
+ if (kerberosUser.isLoggedIn()) {
+ kerberosUser.checkTGTAndRelogin();
+ } else {
+ kerberosUser.login();
+ }
+ return
kerberosUser.doAs((PrivilegedExceptionAction<UserGroupInformation>) () -> {
+ AccessControlContext context = AccessController.getContext();
+ Subject subject = Subject.getSubject(context);
+ Validate.notEmpty(
+
subject.getPrincipals(KerberosPrincipal.class).stream().filter(p ->
p.getName().startsWith(kerberosUser.getPrincipal())).collect(Collectors.toSet()),
+ "No Subject was found matching the given principal");
+ return UserGroupInformation.getUGIFromSubject(subject);
+ });
+ } catch (PrivilegedActionException | LoginException e) {
+ throw new IOException("Unable to acquire UGI for KerberosUser: " +
e.getLocalizedMessage(),
Review comment:
In the case of PrivilegedActionException, the message is always null because
they expect you to get the message from first calling getException() or
getCause() and then getting the message from that, so you may want to do that
first here depending which type of exception.
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