Merge pull request #4128 from stianst/KEYCLOAK-4523

KEYCLOAK-4523 PBKDF2WithHmacSHA256 and PBKDF2WithHmacSHA512 providers
This commit is contained in:
Stian Thorgersen 2017-05-11 13:35:15 +02:00 committed by GitHub
commit 14908d9038
13 changed files with 402 additions and 60 deletions

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@ -17,11 +17,8 @@
package org.keycloak.credential.hash;
import org.keycloak.Config;
import org.keycloak.common.util.Base64;
import org.keycloak.credential.CredentialModel;
import org.keycloak.models.KeycloakSession;
import org.keycloak.models.KeycloakSessionFactory;
import org.keycloak.models.PasswordPolicy;
import org.keycloak.models.UserCredentialModel;
@ -35,42 +32,34 @@ import java.security.spec.KeySpec;
/**
* @author <a href="mailto:me@tsudot.com">Kunal Kerkar</a>
*/
public class Pbkdf2PasswordHashProvider implements PasswordHashProviderFactory, PasswordHashProvider {
public class Pbkdf2PasswordHashProvider implements PasswordHashProvider {
public static final String ID = "pbkdf2";
private final String providerId;
private static final String PBKDF2_ALGORITHM = "PBKDF2WithHmacSHA1";
private static final int DERIVED_KEY_SIZE = 512;
private final String pbkdf2Algorithm;
public CredentialModel encode(String rawPassword, int iterations) {
byte[] salt = getSalt();
String encodedPassword = encode(rawPassword, iterations, salt);
public static final int DERIVED_KEY_SIZE = 512;
CredentialModel credentials = new CredentialModel();
credentials.setAlgorithm(ID);
credentials.setType(UserCredentialModel.PASSWORD);
credentials.setSalt(salt);
credentials.setHashIterations(iterations);
credentials.setValue(encodedPassword);
return credentials;
public Pbkdf2PasswordHashProvider(String providerId, String pbkdf2Algorithm) {
this.providerId = providerId;
this.pbkdf2Algorithm = pbkdf2Algorithm;
}
@Override
public boolean policyCheck(PasswordPolicy policy, CredentialModel credential) {
return credential.getHashIterations() == policy.getHashIterations() && ID.equals(credential.getAlgorithm());
return credential.getHashIterations() == policy.getHashIterations() && providerId.equals(credential.getAlgorithm());
}
@Override
public void encode(String rawPassword, PasswordPolicy policy, CredentialModel credential) {
public void encode(String rawPassword, int iterations, CredentialModel credential) {
byte[] salt = getSalt();
String encodedPassword = encode(rawPassword, policy.getHashIterations(), salt);
String encodedPassword = encode(rawPassword, iterations, salt);
credential.setAlgorithm(ID);
credential.setAlgorithm(providerId);
credential.setType(UserCredentialModel.PASSWORD);
credential.setSalt(salt);
credential.setHashIterations(policy.getHashIterations());
credential.setHashIterations(iterations);
credential.setValue(encodedPassword);
}
@Override
@ -78,27 +67,9 @@ public class Pbkdf2PasswordHashProvider implements PasswordHashProviderFactory,
return encode(rawPassword, credential.getHashIterations(), credential.getSalt()).equals(credential.getValue());
}
@Override
public PasswordHashProvider create(KeycloakSession session) {
return this;
}
@Override
public void init(Config.Scope config) {
}
@Override
public void postInit(KeycloakSessionFactory factory) {
}
public void close() {
}
@Override
public String getId() {
return ID;
}
private String encode(String rawPassword, int iterations, byte[] salt) {
KeySpec spec = new PBEKeySpec(rawPassword.toCharArray(), salt, iterations, DERIVED_KEY_SIZE);
@ -122,10 +93,9 @@ public class Pbkdf2PasswordHashProvider implements PasswordHashProviderFactory,
private SecretKeyFactory getSecretKeyFactory() {
try {
return SecretKeyFactory.getInstance(PBKDF2_ALGORITHM);
return SecretKeyFactory.getInstance(pbkdf2Algorithm);
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException("PBKDF2 algorithm not found", e);
}
}
}

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@ -0,0 +1,54 @@
/*
* Copyright 2016 Red Hat, Inc. and/or its affiliates
* and other contributors as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.keycloak.credential.hash;
import org.keycloak.Config;
import org.keycloak.models.KeycloakSession;
import org.keycloak.models.KeycloakSessionFactory;
/**
* @author <a href="mailto:me@tsudot.com">Kunal Kerkar</a>
*/
public class Pbkdf2PasswordHashProviderFactory implements PasswordHashProviderFactory {
public static final String ID = "pbkdf2";
public static final String PBKDF2_ALGORITHM = "PBKDF2WithHmacSHA1";
@Override
public PasswordHashProvider create(KeycloakSession session) {
return new Pbkdf2PasswordHashProvider(ID, PBKDF2_ALGORITHM);
}
@Override
public void init(Config.Scope config) {
}
@Override
public void postInit(KeycloakSessionFactory factory) {
}
@Override
public String getId() {
return ID;
}
@Override
public void close() {
}
}

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@ -0,0 +1,39 @@
package org.keycloak.credential.hash;
import org.keycloak.Config;
import org.keycloak.models.KeycloakSession;
import org.keycloak.models.KeycloakSessionFactory;
/**
* PBKDF2 Password Hash provider with HMAC using SHA256
*
* @author <a href"mailto:abkaplan07@gmail.com">Adam Kaplan</a>
*/
public class Pbkdf2Sha256PasswordHashProviderFactory implements PasswordHashProviderFactory {
public static final String ID = "pbkdf2-sha256";
public static final String PBKDF2_ALGORITHM = "PBKDF2WithHmacSHA256";
@Override
public PasswordHashProvider create(KeycloakSession session) {
return new Pbkdf2PasswordHashProvider(ID, PBKDF2_ALGORITHM);
}
@Override
public void init(Config.Scope config) {
}
@Override
public void postInit(KeycloakSessionFactory factory) {
}
@Override
public String getId() {
return ID;
}
@Override
public void close() {
}
}

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@ -0,0 +1,39 @@
package org.keycloak.credential.hash;
import org.keycloak.Config;
import org.keycloak.models.KeycloakSession;
import org.keycloak.models.KeycloakSessionFactory;
/**
* Provider factory for SHA512 variant of the PBKDF2 password hash algorithm.
*
* @author @author <a href="mailto:abkaplan07@gmail.com">Adam Kaplan</a>
*/
public class Pbkdf2Sha512PasswordHashProviderFactory implements PasswordHashProviderFactory {
public static final String ID = "pbkdf2-sha512";
public static final String PBKDF2_ALGORITHM = "PBKDF2WithHmacSHA512";
@Override
public PasswordHashProvider create(KeycloakSession session) {
return new Pbkdf2PasswordHashProvider(ID, PBKDF2_ALGORITHM);
}
@Override
public void init(Config.Scope config) {
}
@Override
public void postInit(KeycloakSessionFactory factory) {
}
@Override
public String getId() {
return ID;
}
@Override
public void close() {
}
}

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@ -18,8 +18,10 @@
package org.keycloak.policy;
import org.keycloak.Config;
import org.keycloak.credential.hash.PasswordHashProvider;
import org.keycloak.models.KeycloakSession;
import org.keycloak.models.KeycloakSessionFactory;
import org.keycloak.models.ModelException;
import org.keycloak.models.PasswordPolicy;
import org.keycloak.models.RealmModel;
import org.keycloak.models.UserModel;
@ -29,8 +31,11 @@ import org.keycloak.models.UserModel;
*/
public class HashAlgorithmPasswordPolicyProviderFactory implements PasswordPolicyProviderFactory, PasswordPolicyProvider {
private KeycloakSession session;
@Override
public PasswordPolicyProvider create(KeycloakSession session) {
this.session = session;
return this;
}
@ -83,7 +88,12 @@ public class HashAlgorithmPasswordPolicyProviderFactory implements PasswordPolic
@Override
public Object parseConfig(String value) {
return value != null ? value : PasswordPolicy.HASH_ALGORITHM_DEFAULT;
String providerId = value != null && value.length() > 0 ? value : PasswordPolicy.HASH_ALGORITHM_DEFAULT;
PasswordHashProvider provider = session.getProvider(PasswordHashProvider.class, providerId);
if (provider == null) {
throw new ModelException("Password hashing provider not found");
}
return providerId;
}
}

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@ -27,8 +27,7 @@ import org.keycloak.provider.Provider;
public interface PasswordHashProvider extends Provider {
boolean policyCheck(PasswordPolicy policy, CredentialModel credentia);
void encode(String rawPassword, PasswordPolicy policy, CredentialModel credential);
void encode(String rawPassword, int iterations, CredentialModel credential);
boolean verify(String rawPassword, CredentialModel credential);
}

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@ -95,7 +95,7 @@ public class PasswordCredentialProvider implements CredentialProvider, Credentia
newPassword.setType(CredentialModel.PASSWORD);
long createdDate = Time.currentTimeMillis();
newPassword.setCreatedDate(createdDate);
hash.encode(cred.getValue(), policy, newPassword);
hash.encode(cred.getValue(), policy.getHashIterations(), newPassword);
getCredentialStore().createCredential(realm, user, newPassword);
UserCache userCache = session.userCache();
if (userCache != null) {
@ -207,7 +207,7 @@ public class PasswordCredentialProvider implements CredentialProvider, Credentia
return true;
}
hash.encode(cred.getValue(), policy, password);
hash.encode(cred.getValue(), policy.getHashIterations(), password);
getCredentialStore().updateCredential(realm, user, password);
UserCache userCache = session.userCache();
if (userCache != null) {

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@ -43,6 +43,7 @@ import org.keycloak.models.GroupModel;
import org.keycloak.models.KeycloakSession;
import org.keycloak.models.LDAPConstants;
import org.keycloak.models.ModelDuplicateException;
import org.keycloak.models.ModelException;
import org.keycloak.models.RealmModel;
import org.keycloak.models.UserSessionModel;
import org.keycloak.models.cache.CacheRealmProvider;
@ -328,6 +329,8 @@ public class RealmAdminResource {
return ErrorResponse.error("Specified regex pattern(s) is invalid.", Response.Status.BAD_REQUEST);
} catch (ModelDuplicateException e) {
return ErrorResponse.exists("Realm with same name exists");
} catch (ModelException e) {
return ErrorResponse.error(e.getMessage(), Status.BAD_REQUEST);
} catch (Exception e) {
logger.error(e.getMessage(), e);
return ErrorResponse.error("Failed to update realm", Response.Status.INTERNAL_SERVER_ERROR);

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@ -1 +1,3 @@
org.keycloak.credential.hash.Pbkdf2PasswordHashProvider
org.keycloak.credential.hash.Pbkdf2PasswordHashProviderFactory
org.keycloak.credential.hash.Pbkdf2Sha256PasswordHashProviderFactory
org.keycloak.credential.hash.Pbkdf2Sha512PasswordHashProviderFactory

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@ -0,0 +1,201 @@
/*
* Copyright 2016 Red Hat, Inc. and/or its affiliates
* and other contributors as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.keycloak.testsuite.forms;
import org.jboss.arquillian.container.test.api.Deployment;
import org.jboss.arquillian.graphene.page.Page;
import org.jboss.shrinkwrap.api.spec.WebArchive;
import org.junit.Assert;
import org.junit.Rule;
import org.junit.Test;
import org.keycloak.OAuth2Constants;
import org.keycloak.admin.client.resource.UserResource;
import org.keycloak.common.util.Base64;
import org.keycloak.credential.CredentialModel;
import org.keycloak.credential.hash.Pbkdf2PasswordHashProviderFactory;
import org.keycloak.credential.hash.Pbkdf2Sha256PasswordHashProviderFactory;
import org.keycloak.credential.hash.Pbkdf2Sha512PasswordHashProviderFactory;
import org.keycloak.events.Details;
import org.keycloak.events.EventType;
import org.keycloak.models.BrowserSecurityHeaders;
import org.keycloak.models.RealmModel;
import org.keycloak.models.UserModel;
import org.keycloak.models.utils.ModelToRepresentation;
import org.keycloak.models.utils.RepresentationToModel;
import org.keycloak.representations.idm.CredentialRepresentation;
import org.keycloak.representations.idm.ErrorRepresentation;
import org.keycloak.representations.idm.EventRepresentation;
import org.keycloak.representations.idm.RealmRepresentation;
import org.keycloak.representations.idm.UserRepresentation;
import org.keycloak.testsuite.AbstractTestRealmKeycloakTest;
import org.keycloak.testsuite.AssertEvents;
import org.keycloak.testsuite.admin.ApiUtil;
import org.keycloak.testsuite.client.KeycloakTestingClient;
import org.keycloak.testsuite.pages.AppPage;
import org.keycloak.testsuite.pages.AppPage.RequestType;
import org.keycloak.testsuite.pages.ErrorPage;
import org.keycloak.testsuite.pages.LoginPage;
import org.keycloak.testsuite.pages.LoginPasswordUpdatePage;
import org.keycloak.testsuite.runonserver.RunOnServerDeployment;
import org.keycloak.testsuite.util.RealmBuilder;
import org.keycloak.testsuite.util.UserBuilder;
import org.keycloak.util.JsonSerialization;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.ws.rs.BadRequestException;
import javax.ws.rs.InternalServerErrorException;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.core.Response;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.KeySpec;
import java.util.Map;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
/**
* @author <a href="mailto:sthorger@redhat.com">Stian Thorgersen</a>
*/
public class PasswordHashingTest extends AbstractTestRealmKeycloakTest {
@Deployment
public static WebArchive deploy() {
return RunOnServerDeployment.create(PasswordHashingTest.class, AbstractTestRealmKeycloakTest.class);
}
@Override
public void configureTestRealm(RealmRepresentation testRealm) {
}
@Page
protected LoginPage loginPage;
@Test
public void testSetInvalidProvider() throws Exception {
try {
setPasswordPolicy("hashAlgorithm(nosuch)");
fail("Expected error");
} catch (BadRequestException e) {
ErrorRepresentation error = e.getResponse().readEntity(ErrorRepresentation.class);
assertEquals("Password hashing provider not found", error.getErrorMessage());
}
}
@Test
public void testPasswordRehashedOnAlgorithmChanged() throws Exception {
String username = "testPasswordRehashedOnAlgorithmChanged";
createUser(username);
CredentialModel credential = fetchCredentials(username);
assertEquals(Pbkdf2PasswordHashProviderFactory.ID, credential.getAlgorithm());
assertEncoded(credential, "password", credential.getSalt(), "PBKDF2WithHmacSHA1", 20000);
setPasswordPolicy("hashAlgorithm(" + Pbkdf2Sha256PasswordHashProviderFactory.ID + ")");
loginPage.open();
loginPage.login(username, "password");
credential = fetchCredentials(username);
assertEquals(Pbkdf2Sha256PasswordHashProviderFactory.ID, credential.getAlgorithm());
assertEncoded(credential, "password", credential.getSalt(), "PBKDF2WithHmacSHA256", 20000);
}
@Test
public void testPasswordRehashedOnIterationsChanged() throws Exception {
String username = "testPasswordRehashedOnIterationsChanged";
createUser(username);
CredentialModel credential = fetchCredentials(username);
assertEquals(20000, credential.getHashIterations());
setPasswordPolicy("hashIterations(1)");
loginPage.open();
loginPage.login(username, "password");
credential = fetchCredentials(username);
assertEquals(1, credential.getHashIterations());
assertEncoded(credential, "password", credential.getSalt(), "PBKDF2WithHmacSHA1", 1);
}
@Test
public void testPbkdf2Sha1() throws Exception {
setPasswordPolicy("hashAlgorithm(" + Pbkdf2PasswordHashProviderFactory.ID + ")");
String username = "testPbkdf2Sha1";
createUser(username);
CredentialModel credential = fetchCredentials(username);
assertEncoded(credential, "password", credential.getSalt(), "PBKDF2WithHmacSHA1", 20000);
}
@Test
public void testPbkdf2Sha256() throws Exception {
setPasswordPolicy("hashAlgorithm(" + Pbkdf2Sha256PasswordHashProviderFactory.ID + ")");
String username = "testPbkdf2Sha256";
createUser(username);
CredentialModel credential = fetchCredentials(username);
assertEncoded(credential, "password", credential.getSalt(), "PBKDF2WithHmacSHA256", 20000);
}
@Test
public void testPbkdf2Sha512() throws Exception {
setPasswordPolicy("hashAlgorithm(" + Pbkdf2Sha512PasswordHashProviderFactory.ID + ")");
String username = "testPbkdf2Sha512";
createUser(username);
CredentialModel credential = fetchCredentials(username);
assertEncoded(credential, "password", credential.getSalt(), "PBKDF2WithHmacSHA512", 20000);
}
private void createUser(String username) {
ApiUtil.createUserAndResetPasswordWithAdminClient(adminClient.realm("test"), UserBuilder.create().username(username).build(), "password");
}
private void setPasswordPolicy(String policy) {
RealmRepresentation realmRep = testRealm().toRepresentation();
realmRep.setPasswordPolicy(policy);
testRealm().update(realmRep);
}
private CredentialModel fetchCredentials(String username) {
return testingClient.server("test").fetch(session -> {
RealmModel realm = session.getContext().getRealm();
UserModel user = session.users().getUserByUsername(username, realm);
return session.userCredentialManager().getStoredCredentialsByType(realm, user, CredentialRepresentation.PASSWORD).get(0);
}, CredentialModel.class);
}
private void assertEncoded(CredentialModel credential, String password, byte[] salt, String algorithm, int iterations) throws Exception {
KeySpec spec = new PBEKeySpec(password.toCharArray(), salt, iterations, 512);
byte[] key = SecretKeyFactory.getInstance(algorithm).generateSecret(spec).getEncoded();
assertEquals(Base64.encodeBytes(key), credential.getValue());
}
}

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@ -26,7 +26,7 @@ import org.junit.rules.TemporaryFolder;
import org.keycloak.admin.client.Keycloak;
import org.keycloak.admin.client.resource.RealmResource;
import org.keycloak.admin.client.resource.UserResource;
import org.keycloak.credential.hash.Pbkdf2PasswordHashProvider;
import org.keycloak.credential.hash.Pbkdf2PasswordHashProviderFactory;
import org.keycloak.models.Constants;
import org.keycloak.representations.idm.ClientRepresentation;
import org.keycloak.representations.idm.CredentialRepresentation;
@ -85,7 +85,7 @@ public class AddUserTest {
CredentialRepresentation credentials = user.getCredentials().get(0);
assertEquals(Pbkdf2PasswordHashProvider.ID, credentials.getAlgorithm());
assertEquals(Pbkdf2PasswordHashProviderFactory.ID, credentials.getAlgorithm());
assertEquals(new Integer(100000), credentials.getHashIterations());
KeycloakServer server = new KeycloakServer();

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@ -103,7 +103,7 @@ public class FederatedStorageExportImportTest {
session.userFederatedStorage().addRequiredAction(realm, userId, "UPDATE_PASSWORD");
CredentialModel credential = new CredentialModel();
getHashProvider(session, realm.getPasswordPolicy()).encode("password", realm.
getPasswordPolicy(), credential);
getPasswordPolicy().getHashIterations(), credential);
session.userFederatedStorage().createCredential(realm, userId, credential);
session.userFederatedStorage().grantRole(realm, userId, role);
session.userFederatedStorage().joinGroup(realm, userId, group);
@ -170,7 +170,7 @@ public class FederatedStorageExportImportTest {
session.userFederatedStorage().addRequiredAction(realm, userId, "UPDATE_PASSWORD");
CredentialModel credential = new CredentialModel();
getHashProvider(session, realm.getPasswordPolicy()).encode("password", realm.
getPasswordPolicy(), credential);
getPasswordPolicy().getHashIterations(), credential);
session.userFederatedStorage().createCredential(realm, userId, credential);
session.userFederatedStorage().grantRole(realm, userId, role);
session.userFederatedStorage().joinGroup(realm, userId, group);

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@ -30,7 +30,10 @@ import org.jboss.aesh.console.command.registry.AeshCommandRegistryBuilder;
import org.jboss.aesh.console.command.registry.CommandRegistry;
import org.keycloak.common.util.Base64;
import org.keycloak.credential.CredentialModel;
import org.keycloak.credential.hash.Pbkdf2PasswordHashProvider;
import org.keycloak.credential.hash.PasswordHashProvider;
import org.keycloak.credential.hash.PasswordHashProviderFactory;
import org.keycloak.credential.hash.Pbkdf2PasswordHashProviderFactory;
import org.keycloak.models.PasswordPolicy;
import org.keycloak.representations.idm.CredentialRepresentation;
import org.keycloak.representations.idm.RealmRepresentation;
import org.keycloak.representations.idm.UserRepresentation;
@ -44,6 +47,8 @@ import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.ServiceLoader;
/**
* @author <a href="mailto:sthorger@redhat.com">Stian Thorgersen</a>
@ -52,6 +57,7 @@ public class AddUser {
private static final String COMMAND_NAME = "add-user";
private static final int DEFAULT_HASH_ITERATIONS = 100000;
private static final String DEFAULT_HASH_ALGORITH = PasswordPolicy.HASH_ALGORITHM_DEFAULT;
public static void main(String[] args) throws Exception {
AddUserCommand command = new AddUserCommand();
@ -152,14 +158,23 @@ public class AddUser {
user.setUsername(userName);
user.setCredentials(new LinkedList<CredentialRepresentation>());
CredentialModel credentialValueModel = new Pbkdf2PasswordHashProvider().encode(password, iterations > 0 ? iterations : DEFAULT_HASH_ITERATIONS);
Map<String, Object> config = new HashMap<>();
if (iterations > 0) {
config.put("hashIterations", iterations);
}
PasswordHashProviderFactory hashProviderFactory = getHashProviderFactory(DEFAULT_HASH_ALGORITH);
PasswordHashProvider hashProvider = hashProviderFactory.create(null);
CredentialModel credentialModel = new CredentialModel();
hashProvider.encode(password, iterations > 0 ? iterations : DEFAULT_HASH_ITERATIONS, credentialModel);
CredentialRepresentation credentials = new CredentialRepresentation();
credentials.setType(credentialValueModel.getType());
credentials.setAlgorithm(credentialValueModel.getAlgorithm());
credentials.setHashIterations(credentialValueModel.getHashIterations());
credentials.setSalt(Base64.encodeBytes(credentialValueModel.getSalt()));
credentials.setHashedSaltedValue(credentialValueModel.getValue());
credentials.setType(credentialModel.getType());
credentials.setAlgorithm(credentialModel.getAlgorithm());
credentials.setHashIterations(credentialModel.getHashIterations());
credentials.setSalt(Base64.encodeBytes(credentialModel.getSalt()));
credentials.setHashedSaltedValue(credentialModel.getValue());
user.getCredentials().add(credentials);
@ -203,6 +218,16 @@ public class AddUser {
System.out.println("Added '" + userName + "' to '" + addUserFile + "', restart server to load user");
}
private static PasswordHashProviderFactory getHashProviderFactory(String providerId) {
ServiceLoader<PasswordHashProviderFactory> providerFactories = ServiceLoader.load(PasswordHashProviderFactory.class);
for (PasswordHashProviderFactory f : providerFactories) {
if (f.getId().equals(providerId)) {
return f;
}
}
return null;
}
private static void checkRequired(Command command, String field) throws Exception {
if (isEmpty(command, field)) {
Option option = command.getClass().getDeclaredField(field).getAnnotation(Option.class);