| /* |
| * Copyright (c) 2019, 2021, Red Hat, Inc. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 8215032 |
| * @library /test/lib |
| * @run main/othervm/timeout=120 -Dsun.security.krb5.debug=true ReferralsTest |
| * @summary Test Kerberos cross-realm referrals (RFC 6806) |
| */ |
| |
| import java.io.File; |
| import java.security.Principal; |
| import java.util.Arrays; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import javax.security.auth.kerberos.KerberosTicket; |
| import javax.security.auth.Subject; |
| import javax.security.auth.login.LoginException; |
| |
| import org.ietf.jgss.GSSName; |
| |
| import sun.security.jgss.GSSUtil; |
| import sun.security.krb5.Config; |
| import sun.security.krb5.PrincipalName; |
| |
| public class ReferralsTest { |
| private static final boolean DEBUG = true; |
| private static final String krbConfigName = "krb5-localkdc.conf"; |
| private static final String krbConfigNameNoCanonicalize = |
| "krb5-localkdc-nocanonicalize.conf"; |
| private static final String realmKDC1 = "RABBIT.HOLE"; |
| private static final String realmKDC2 = "DEV.RABBIT.HOLE"; |
| private static final char[] password = "123qwe@Z".toCharArray(); |
| |
| // Names |
| private static final String clientName = "test"; |
| private static final String userName = "user"; |
| private static final String serviceName = "http" + |
| PrincipalName.NAME_COMPONENT_SEPARATOR_STR + |
| "server.dev.rabbit.hole"; |
| private static final String backendServiceName = "cifs" + |
| PrincipalName.NAME_COMPONENT_SEPARATOR_STR + |
| "backend.rabbit.hole"; |
| |
| // Alias |
| private static final String clientAlias = clientName + |
| PrincipalName.NAME_REALM_SEPARATOR_STR + realmKDC1; |
| |
| // Names + realms |
| private static final String clientKDC1Name = clientAlias.replaceAll( |
| PrincipalName.NAME_REALM_SEPARATOR_STR, "\\\\" + |
| PrincipalName.NAME_REALM_SEPARATOR_STR) + |
| PrincipalName.NAME_REALM_SEPARATOR_STR + realmKDC1; |
| private static final String clientKDC2Name = clientName + |
| PrincipalName.NAME_REALM_SEPARATOR_STR + realmKDC2; |
| private static final String userKDC1Name = userName + |
| PrincipalName.NAME_REALM_SEPARATOR_STR + realmKDC1; |
| private static final String serviceKDC2Name = serviceName + |
| PrincipalName.NAME_REALM_SEPARATOR_STR + realmKDC2; |
| private static final String backendKDC1Name = backendServiceName + |
| PrincipalName.NAME_REALM_SEPARATOR_STR + realmKDC1; |
| private static final String krbtgtKDC1 = |
| PrincipalName.TGS_DEFAULT_SRV_NAME + |
| PrincipalName.NAME_COMPONENT_SEPARATOR_STR + realmKDC1; |
| private static final String krbtgtKDC2 = |
| PrincipalName.TGS_DEFAULT_SRV_NAME + |
| PrincipalName.NAME_COMPONENT_SEPARATOR_STR + realmKDC2; |
| private static final String krbtgtKDC1toKDC2 = |
| PrincipalName.TGS_DEFAULT_SRV_NAME + |
| PrincipalName.NAME_COMPONENT_SEPARATOR_STR + realmKDC2 + |
| PrincipalName.NAME_REALM_SEPARATOR_STR + realmKDC1; |
| private static final String krbtgtKDC2toKDC1 = |
| PrincipalName.TGS_DEFAULT_SRV_NAME + |
| PrincipalName.NAME_COMPONENT_SEPARATOR_STR + realmKDC1 + |
| PrincipalName.NAME_REALM_SEPARATOR_STR + realmKDC2; |
| |
| public static void main(String[] args) throws Exception { |
| try { |
| initializeKDCs(); |
| testSubjectCredentials(); |
| testDelegation(); |
| testImpersonation(); |
| testDelegationWithReferrals(); |
| testNoCanonicalize(); |
| } finally { |
| cleanup(); |
| } |
| } |
| |
| private static void initializeKDCs() throws Exception { |
| KDC kdc1 = KDC.create(realmKDC1, "localhost", 0, true); |
| kdc1.addPrincipalRandKey(krbtgtKDC1); |
| kdc1.addPrincipal(krbtgtKDC2toKDC1, password); |
| kdc1.addPrincipal(krbtgtKDC2, password); |
| kdc1.addPrincipal(userKDC1Name, password); |
| kdc1.addPrincipal(backendServiceName, password); |
| |
| KDC kdc2 = KDC.create(realmKDC2, "localhost", 0, true); |
| kdc2.addPrincipalRandKey(krbtgtKDC2); |
| kdc2.addPrincipal(clientKDC2Name, password); |
| kdc2.addPrincipal(serviceName, password); |
| kdc2.addPrincipal(krbtgtKDC1, password); |
| kdc2.addPrincipal(krbtgtKDC1toKDC2, password); |
| |
| kdc1.registerAlias(clientAlias, kdc2); |
| kdc1.registerAlias(serviceName, kdc2); |
| kdc2.registerAlias(clientAlias, clientKDC2Name); |
| kdc2.registerAlias(backendServiceName, kdc1); |
| |
| kdc1.setOption(KDC.Option.ALLOW_S4U2SELF, Arrays.asList( |
| new String[]{serviceName + "@" + realmKDC2})); |
| Map<String,List<String>> mapKDC1 = new HashMap<>(); |
| mapKDC1.put(serviceName + "@" + realmKDC2, Arrays.asList( |
| new String[]{backendKDC1Name})); |
| kdc1.setOption(KDC.Option.ALLOW_S4U2PROXY, mapKDC1); |
| |
| Map<String,List<String>> mapKDC2 = new HashMap<>(); |
| mapKDC2.put(serviceName + "@" + realmKDC2, Arrays.asList( |
| new String[]{serviceName + "@" + realmKDC2, |
| krbtgtKDC2toKDC1})); |
| kdc2.setOption(KDC.Option.ALLOW_S4U2PROXY, mapKDC2); |
| |
| KDC.saveConfig(krbConfigName, kdc1, kdc2, |
| "forwardable=true", "canonicalize=true"); |
| KDC.saveConfig(krbConfigNameNoCanonicalize, kdc1, kdc2, |
| "forwardable=true"); |
| System.setProperty("java.security.krb5.conf", krbConfigName); |
| } |
| |
| private static void cleanup() { |
| String[] configFiles = new String[]{krbConfigName, |
| krbConfigNameNoCanonicalize}; |
| for (String configFile : configFiles) { |
| File f = new File(configFile); |
| if (f.exists()) { |
| f.delete(); |
| } |
| } |
| } |
| |
| /* |
| * The client subject (whose principal is |
| * test@RABBIT.HOLE@RABBIT.HOLE) will obtain a TGT after |
| * realm referral and name canonicalization (TGT cname |
| * will be test@DEV.RABBIT.HOLE). With this TGT, the client will request |
| * a TGS for service http/server.dev.rabbit.hole@RABBIT.HOLE. After |
| * realm referral, a http/server.dev.rabbit.hole@DEV.RABBIT.HOLE TGS |
| * will be obtained. |
| * |
| * Assert that we get the proper TGT and TGS tickets, and that they are |
| * associated to the client subject. |
| * |
| * Assert that if we request a TGS for the same service again (based on the |
| * original service name), we don't get a new one but the previous, |
| * already in the subject credentials. |
| */ |
| private static void testSubjectCredentials() throws Exception { |
| Subject clientSubject = new Subject(); |
| Context clientContext = Context.fromUserPass(clientSubject, |
| clientKDC1Name, password, false); |
| |
| Set<Principal> clientPrincipals = clientSubject.getPrincipals(); |
| if (clientPrincipals.size() != 1) { |
| throw new Exception("Only one client subject principal expected"); |
| } |
| Principal clientPrincipal = clientPrincipals.iterator().next(); |
| if (DEBUG) { |
| System.out.println("Client subject principal: " + |
| clientPrincipal.getName()); |
| } |
| if (!clientPrincipal.getName().equals(clientKDC1Name)) { |
| throw new Exception("Unexpected client subject principal."); |
| } |
| |
| clientContext.startAsClient(serviceName, GSSUtil.GSS_KRB5_MECH_OID); |
| clientContext.take(new byte[0]); |
| Set<KerberosTicket> clientTickets = |
| clientSubject.getPrivateCredentials(KerberosTicket.class); |
| boolean tgtFound = false; |
| boolean tgsFound = false; |
| for (KerberosTicket clientTicket : clientTickets) { |
| String cname = clientTicket.getClient().getName(); |
| String sname = clientTicket.getServer().getName(); |
| if (cname.equals(clientKDC2Name)) { |
| if (sname.equals(krbtgtKDC2 + |
| PrincipalName.NAME_REALM_SEPARATOR_STR + realmKDC2)) { |
| tgtFound = true; |
| } else if (sname.equals(serviceKDC2Name)) { |
| tgsFound = true; |
| } |
| } |
| if (DEBUG) { |
| System.out.println("Client subject KerberosTicket:"); |
| System.out.println(clientTicket); |
| } |
| } |
| if (!tgtFound || !tgsFound) { |
| throw new Exception("client subject tickets (TGT/TGS) not found."); |
| } |
| int numOfTickets = clientTickets.size(); |
| clientContext.startAsClient(serviceName, GSSUtil.GSS_KRB5_MECH_OID); |
| clientContext.take(new byte[0]); |
| clientContext.status(); |
| int newNumOfTickets = |
| clientSubject.getPrivateCredentials(KerberosTicket.class).size(); |
| if (DEBUG) { |
| System.out.println("client subject number of tickets: " + |
| numOfTickets); |
| System.out.println("client subject new number of tickets: " + |
| newNumOfTickets); |
| } |
| if (numOfTickets != newNumOfTickets) { |
| throw new Exception("Useless client subject TGS request because" + |
| " TGS was not found in private credentials."); |
| } |
| } |
| |
| /* |
| * The server (http/server.dev.rabbit.hole@DEV.RABBIT.HOLE) |
| * will authenticate on itself on behalf of the client |
| * (test@DEV.RABBIT.HOLE). Cross-realm referrals will occur |
| * when requesting different TGTs and TGSs (including the |
| * request for delegated credentials). |
| */ |
| private static void testDelegation() throws Exception { |
| Context c = Context.fromUserPass(clientKDC2Name, |
| password, false); |
| c.startAsClient(serviceName, GSSUtil.GSS_KRB5_MECH_OID); |
| Context s = Context.fromUserPass(serviceKDC2Name, |
| password, true); |
| s.startAsServer(GSSUtil.GSS_KRB5_MECH_OID); |
| Context.handshake(c, s); |
| Context delegatedContext = s.delegated(); |
| delegatedContext.startAsClient(serviceName, GSSUtil.GSS_KRB5_MECH_OID); |
| delegatedContext.x().requestMutualAuth(false); |
| Context s2 = Context.fromUserPass(serviceKDC2Name, |
| password, true); |
| s2.startAsServer(GSSUtil.GSS_KRB5_MECH_OID); |
| |
| // Test authentication |
| Context.handshake(delegatedContext, s2); |
| if (!delegatedContext.x().isEstablished() || !s2.x().isEstablished()) { |
| throw new Exception("Delegated authentication failed"); |
| } |
| |
| // Test identities |
| GSSName contextInitiatorName = delegatedContext.x().getSrcName(); |
| GSSName contextAcceptorName = delegatedContext.x().getTargName(); |
| if (DEBUG) { |
| System.out.println("Context initiator: " + contextInitiatorName); |
| System.out.println("Context acceptor: " + contextAcceptorName); |
| } |
| if (!contextInitiatorName.toString().equals(clientKDC2Name) || |
| !contextAcceptorName.toString().equals(serviceName)) { |
| throw new Exception("Unexpected initiator or acceptor names"); |
| } |
| } |
| |
| /* |
| * The server (http/server.dev.rabbit.hole@DEV.RABBIT.HOLE) |
| * will get a TGS ticket for itself on behalf of the client |
| * (user@RABBIT.HOLE). Cross-realm referrals will be handled |
| * in S4U2Self requests because the user and the server are |
| * on different realms. |
| */ |
| private static void testImpersonation() throws Exception { |
| testImpersonationSingle(); |
| |
| // Try a second time to force the use of the Referrals Cache. |
| // During this execution, the referral ticket from RABBIT.HOLE |
| // to DEV.RABBIT.HOLE (upon the initial S4U2Self message) will |
| // be obtained from the Cache. |
| testImpersonationSingle(); |
| } |
| |
| private static void testImpersonationSingle() throws Exception { |
| Context s = Context.fromUserPass(serviceKDC2Name, password, true); |
| s.startAsServer(GSSUtil.GSS_KRB5_MECH_OID); |
| GSSName impName = s.impersonate(userKDC1Name).cred().getName(); |
| if (DEBUG) { |
| System.out.println("Impersonated name: " + impName); |
| } |
| if (!impName.toString().equals(userKDC1Name)) { |
| throw new Exception("Unexpected impersonated name"); |
| } |
| } |
| |
| /* |
| * The server (http/server.dev.rabbit.hole@DEV.RABBIT.HOLE) |
| * will use delegated credentials (user@RABBIT.HOLE) to |
| * authenticate in the backend (cifs/backend.rabbit.hole@RABBIT.HOLE). |
| * Cross-realm referrals will be handled in S4U2Proxy requests |
| * because the server and the backend are on different realms. |
| */ |
| private static void testDelegationWithReferrals() throws Exception { |
| testDelegationWithReferralsSingle(); |
| |
| // Try a second time to force the use of the Referrals Cache. |
| // During this execution, the referral ticket from RABBIT.HOLE |
| // to DEV.RABBIT.HOLE (upon the initial S4U2Proxy message) will |
| // be obtained from the Cache. |
| testDelegationWithReferralsSingle(); |
| } |
| |
| private static void testDelegationWithReferralsSingle() throws Exception { |
| Context c = Context.fromUserPass(userKDC1Name, password, false); |
| c.startAsClient(serviceName, GSSUtil.GSS_KRB5_MECH_OID); |
| Context s = Context.fromUserPass(serviceKDC2Name, password, true); |
| s.startAsServer(GSSUtil.GSS_KRB5_MECH_OID); |
| Context.handshake(c, s); |
| Context delegatedContext = s.delegated(); |
| delegatedContext.startAsClient(backendServiceName, |
| GSSUtil.GSS_KRB5_MECH_OID); |
| delegatedContext.x().requestMutualAuth(false); |
| Context b = Context.fromUserPass(backendKDC1Name, password, true); |
| b.startAsServer(GSSUtil.GSS_KRB5_MECH_OID); |
| |
| // Test authentication |
| Context.handshake(delegatedContext, b); |
| if (!delegatedContext.x().isEstablished() || !b.x().isEstablished()) { |
| throw new Exception("Delegated authentication failed"); |
| } |
| |
| // Test identities |
| GSSName contextInitiatorName = delegatedContext.x().getSrcName(); |
| GSSName contextAcceptorName = delegatedContext.x().getTargName(); |
| if (DEBUG) { |
| System.out.println("Context initiator: " + contextInitiatorName); |
| System.out.println("Context acceptor: " + contextAcceptorName); |
| } |
| if (!contextInitiatorName.toString().equals(userKDC1Name) || |
| !contextAcceptorName.toString().equals(backendServiceName)) { |
| throw new Exception("Unexpected initiator or acceptor names"); |
| } |
| } |
| |
| /* |
| * The client tries to get a TGT (AS protocol) as in testSubjectCredentials |
| * but without the canonicalize setting in krb5.conf. The KDC |
| * must not return a referral but a failure because the client |
| * is not in the local database. |
| */ |
| private static void testNoCanonicalize() throws Exception { |
| System.setProperty("java.security.krb5.conf", |
| krbConfigNameNoCanonicalize); |
| Config.refresh(); |
| try { |
| Context.fromUserPass(new Subject(), |
| clientKDC1Name, password, false); |
| throw new Exception("should not succeed"); |
| } catch (LoginException e) { |
| // expected |
| } |
| } |
| } |