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/*
* JBoss, Home of Professional Open Source.
* Copyright 2020 Red Hat, Inc., and individual 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.wildfly.security.auth.realm;
import org.wildfly.common.Assert;
import org.wildfly.security.auth.SupportLevel;
import org.wildfly.security.auth.server.RealmIdentity;
import org.wildfly.security.auth.server.RealmUnavailableException;
import org.wildfly.security.auth.server.SecurityRealm;
import org.wildfly.security.authz.AuthorizationIdentity;
import org.wildfly.security.credential.Credential;
import org.wildfly.security.evidence.AlgorithmEvidence;
import org.wildfly.security.evidence.Evidence;
import java.security.Principal;
import java.security.spec.AlgorithmParameterSpec;
/**
* A realm for authentication and authorization of identities distributed between multiple realms.
*
* @author Martin Mazanek
*/
public class DistributedSecurityRealm implements SecurityRealm {
private final SecurityRealm[] securityRealms;
public DistributedSecurityRealm(final SecurityRealm... securityRealms) {
Assert.checkNotNullParam("securityRealms", securityRealms);
this.securityRealms = securityRealms;
}
@Override
public RealmIdentity getRealmIdentity(final Evidence evidence) throws RealmUnavailableException {
return new EvidenceDistributedIdentity(evidence);
}
@Override
public RealmIdentity getRealmIdentity(final Principal principal) throws RealmUnavailableException {
return new PrincipalDistributedIdentity(principal);
}
@Override
public SupportLevel getCredentialAcquireSupport(final Class credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec) throws RealmUnavailableException {
SupportLevel max = SupportLevel.UNSUPPORTED;
for (SecurityRealm r : securityRealms) {
max = SupportLevel.max(max, r.getCredentialAcquireSupport(credentialType, algorithmName, parameterSpec));
}
return max;
}
@Override
public SupportLevel getEvidenceVerifySupport(final Class evidenceType, final String algorithmName) throws RealmUnavailableException {
SupportLevel max = SupportLevel.UNSUPPORTED;
for (SecurityRealm r : securityRealms) {
max = SupportLevel.max(max, r.getEvidenceVerifySupport(evidenceType, algorithmName));
}
return max;
}
final class EvidenceDistributedIdentity implements RealmIdentity {
private final Evidence evidence;
private final String evidenceAlgorithm;
private RealmIdentity currentIdentity = RealmIdentity.NON_EXISTENT;
private int nextRealm = 0;
private EvidenceDistributedIdentity(Evidence evidence) throws RealmUnavailableException {
this.evidence = evidence;
if (evidence instanceof AlgorithmEvidence) {
evidenceAlgorithm = ((AlgorithmEvidence) evidence).getAlgorithm();
} else {
evidenceAlgorithm = null;
}
nextIdentity();
}
private boolean nextIdentity() throws RealmUnavailableException {
currentIdentity.dispose();
if (nextRealm >= securityRealms.length) {
currentIdentity = RealmIdentity.NON_EXISTENT;
return false;
}
if (securityRealms[nextRealm].getEvidenceVerifySupport(evidence.getClass(), evidenceAlgorithm).mayBeSupported()) {
currentIdentity = securityRealms[nextRealm].getRealmIdentity(evidence);
nextRealm++;
if (currentIdentity.getEvidenceVerifySupport(evidence.getClass(), evidenceAlgorithm).isNotSupported()) {
return nextIdentity();
}
} else {
nextRealm++;
return nextIdentity();
}
return true;
}
@Override
public Principal getRealmIdentityPrincipal() {
return currentIdentity.getRealmIdentityPrincipal();
}
@Override
public SupportLevel getCredentialAcquireSupport(final Class credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec) throws RealmUnavailableException {
// Identity created from evidence will be verified using the evidence
return SupportLevel.UNSUPPORTED;
}
@Override
public SupportLevel getEvidenceVerifySupport(final Class evidenceType, final String algorithmName) throws RealmUnavailableException {
//as server verifies evidence with same evidence used for creating realm identity, we dont have to look into remaining realms for support (currentIdentity will always support evidence verification, unless none of the possible does)
return currentIdentity.getEvidenceVerifySupport(evidenceType, algorithmName);
}
@Override
public C getCredential(final Class credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec) throws RealmUnavailableException {
return null;
}
@Override
public C getCredential(final Class credentialType, final String algorithmName) throws RealmUnavailableException {
return null;
}
@Override
public C getCredential(final Class credentialType) throws RealmUnavailableException {
return null;
}
@Override
public boolean verifyEvidence(final Evidence evidence) throws RealmUnavailableException {
do {
if (currentIdentity.verifyEvidence(evidence)) {
return true;
}
} while (nextIdentity());
return false;
}
@Override
public boolean exists() throws RealmUnavailableException {
return currentIdentity.exists();
}
@Override
public AuthorizationIdentity getAuthorizationIdentity() throws RealmUnavailableException {
return currentIdentity.getAuthorizationIdentity();
}
@Override
public void dispose() {
currentIdentity.dispose();
}
}
final class PrincipalDistributedIdentity implements RealmIdentity {
private final Principal principal;
private RealmIdentity currentIdentity = RealmIdentity.NON_EXISTENT;
private int nextRealm = 0;
PrincipalDistributedIdentity(Principal principal) throws RealmUnavailableException {
this.principal = principal;
nextIdentity();
}
private boolean nextIdentity() throws RealmUnavailableException {
currentIdentity.dispose();
if (nextRealm >= securityRealms.length) {
currentIdentity = RealmIdentity.NON_EXISTENT;
return false;
}
currentIdentity = securityRealms[nextRealm].getRealmIdentity(principal);
nextRealm++;
if (!currentIdentity.exists()) {
return nextIdentity();
}
return true;
}
@Override
public Principal getRealmIdentityPrincipal() {
return currentIdentity.getRealmIdentityPrincipal();
}
@Override
public SupportLevel getCredentialAcquireSupport(final Class credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec) throws RealmUnavailableException {
return currentIdentity.getCredentialAcquireSupport(credentialType, algorithmName, parameterSpec);
}
@Override
public SupportLevel getEvidenceVerifySupport(final Class evidenceType, final String algorithmName) throws RealmUnavailableException {
return currentIdentity.getEvidenceVerifySupport(evidenceType, algorithmName);
}
@Override
public C getCredential(final Class credentialType, final String algorithmName, final AlgorithmParameterSpec parameterSpec) throws RealmUnavailableException {
do {
C credential = currentIdentity.getCredential(credentialType, algorithmName, parameterSpec);
if (credential != null) {
return credential;
}
} while (nextIdentity());
return null;
}
@Override
public C getCredential(final Class credentialType, final String algorithmName) throws RealmUnavailableException {
do {
C credential = currentIdentity.getCredential(credentialType, algorithmName);
if (credential != null) {
return credential;
}
} while (nextIdentity());
return null;
}
@Override
public C getCredential(final Class credentialType) throws RealmUnavailableException {
do {
C credential = currentIdentity.getCredential(credentialType);
if (credential != null) {
return credential;
}
} while (nextIdentity());
return null;
}
@Override
public boolean verifyEvidence(final Evidence evidence) throws RealmUnavailableException {
return currentIdentity.verifyEvidence(evidence);
}
@Override
public boolean exists() throws RealmUnavailableException {
return currentIdentity.exists();
}
@Override
public AuthorizationIdentity getAuthorizationIdentity() throws RealmUnavailableException {
return currentIdentity.getAuthorizationIdentity();
}
@Override
public void dispose() {
currentIdentity.dispose();
}
}
}
