| /* |
| * Copyright (c) 2000, 2009, Oracle and/or its affiliates. All rights reserved. |
| * 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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. |
| */ |
| |
| package sun.security.jgss.krb5; |
| |
| import org.ietf.jgss.*; |
| import sun.security.jgss.GSSUtil; |
| import sun.security.jgss.GSSCaller; |
| import sun.security.jgss.spi.*; |
| import javax.security.auth.kerberos.ServicePermission; |
| import java.security.Provider; |
| import java.util.Vector; |
| |
| /** |
| * Krb5 Mechanism plug in for JGSS |
| * This is the properties object required by the JGSS framework. |
| * All mechanism specific information is defined here. |
| * |
| * @author Mayank Upadhyay |
| */ |
| |
| public final class Krb5MechFactory implements MechanismFactory { |
| |
| private static final boolean DEBUG = Krb5Util.DEBUG; |
| |
| static final Provider PROVIDER = |
| new sun.security.jgss.SunProvider(); |
| |
| static final Oid GSS_KRB5_MECH_OID = |
| createOid("1.2.840.113554.1.2.2"); |
| |
| static final Oid NT_GSS_KRB5_PRINCIPAL = |
| createOid("1.2.840.113554.1.2.2.1"); |
| |
| private static Oid[] nameTypes = |
| new Oid[] { GSSName.NT_USER_NAME, |
| GSSName.NT_HOSTBASED_SERVICE, |
| GSSName.NT_EXPORT_NAME, |
| NT_GSS_KRB5_PRINCIPAL}; |
| |
| final private GSSCaller caller; |
| |
| private static Krb5CredElement getCredFromSubject(GSSNameSpi name, |
| boolean initiate) |
| throws GSSException { |
| Vector<Krb5CredElement> creds = |
| GSSUtil.searchSubject(name, GSS_KRB5_MECH_OID, initiate, |
| (initiate ? |
| Krb5InitCredential.class : |
| Krb5AcceptCredential.class)); |
| |
| Krb5CredElement result = ((creds == null || creds.isEmpty()) ? |
| null : creds.firstElement()); |
| |
| // Force permission check before returning the cred to caller |
| if (result != null) { |
| if (initiate) { |
| checkInitCredPermission((Krb5NameElement) result.getName()); |
| } else { |
| checkAcceptCredPermission |
| ((Krb5NameElement) result.getName(), name); |
| } |
| } |
| return result; |
| } |
| |
| public Krb5MechFactory(GSSCaller caller) { |
| this.caller = caller; |
| } |
| |
| public GSSNameSpi getNameElement(String nameStr, Oid nameType) |
| throws GSSException { |
| return Krb5NameElement.getInstance(nameStr, nameType); |
| } |
| |
| public GSSNameSpi getNameElement(byte[] name, Oid nameType) |
| throws GSSException { |
| // At this point, even an exported name is stripped down to safe |
| // bytes only |
| // XXX Use encoding here |
| return Krb5NameElement.getInstance(new String(name), nameType); |
| } |
| |
| public GSSCredentialSpi getCredentialElement(GSSNameSpi name, |
| int initLifetime, int acceptLifetime, |
| int usage) throws GSSException { |
| |
| if (name != null && !(name instanceof Krb5NameElement)) { |
| name = Krb5NameElement.getInstance(name.toString(), |
| name.getStringNameType()); |
| } |
| |
| Krb5CredElement credElement = getCredFromSubject |
| (name, (usage != GSSCredential.ACCEPT_ONLY)); |
| |
| if (credElement == null) { |
| if (usage == GSSCredential.INITIATE_ONLY || |
| usage == GSSCredential.INITIATE_AND_ACCEPT) { |
| credElement = Krb5InitCredential.getInstance |
| (caller, (Krb5NameElement) name, initLifetime); |
| checkInitCredPermission |
| ((Krb5NameElement) credElement.getName()); |
| } else if (usage == GSSCredential.ACCEPT_ONLY) { |
| credElement = |
| Krb5AcceptCredential.getInstance(caller, |
| (Krb5NameElement) name); |
| checkAcceptCredPermission |
| ((Krb5NameElement) credElement.getName(), name); |
| } else |
| throw new GSSException(GSSException.FAILURE, -1, |
| "Unknown usage mode requested"); |
| } |
| return credElement; |
| } |
| |
| public static void checkInitCredPermission(Krb5NameElement name) { |
| SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| String realm = (name.getKrb5PrincipalName()).getRealmAsString(); |
| String tgsPrincipal = |
| new String("krbtgt/" + realm + '@' + realm); |
| ServicePermission perm = |
| new ServicePermission(tgsPrincipal, "initiate"); |
| try { |
| sm.checkPermission(perm); |
| } catch (SecurityException e) { |
| if (DEBUG) { |
| System.out.println("Permission to initiate" + |
| "kerberos init credential" + e.getMessage()); |
| } |
| throw e; |
| } |
| } |
| } |
| |
| public static void checkAcceptCredPermission(Krb5NameElement name, |
| GSSNameSpi originalName) { |
| SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| ServicePermission perm = new ServicePermission |
| (name.getKrb5PrincipalName().getName(), "accept"); |
| try { |
| sm.checkPermission(perm); |
| } catch (SecurityException e) { |
| if (originalName == null) { |
| // Don't disclose the name of the principal |
| e = new SecurityException("No permission to acquire " |
| + "Kerberos accept credential"); |
| // Don't call e.initCause() with caught exception |
| } |
| throw e; |
| } |
| } |
| } |
| |
| public GSSContextSpi getMechanismContext(GSSNameSpi peer, |
| GSSCredentialSpi myInitiatorCred, int lifetime) |
| throws GSSException { |
| if (peer != null && !(peer instanceof Krb5NameElement)) { |
| peer = Krb5NameElement.getInstance(peer.toString(), |
| peer.getStringNameType()); |
| } |
| // XXX Convert myInitiatorCred to Krb5CredElement |
| if (myInitiatorCred == null) { |
| myInitiatorCred = getCredentialElement(null, lifetime, 0, |
| GSSCredential.INITIATE_ONLY); |
| } |
| return new Krb5Context(caller, (Krb5NameElement)peer, |
| (Krb5CredElement)myInitiatorCred, lifetime); |
| } |
| |
| public GSSContextSpi getMechanismContext(GSSCredentialSpi myAcceptorCred) |
| throws GSSException { |
| // XXX Convert myAcceptorCred to Krb5CredElement |
| if (myAcceptorCred == null) { |
| myAcceptorCred = getCredentialElement(null, 0, |
| GSSCredential.INDEFINITE_LIFETIME, GSSCredential.ACCEPT_ONLY); |
| } |
| return new Krb5Context(caller, (Krb5CredElement)myAcceptorCred); |
| } |
| |
| public GSSContextSpi getMechanismContext(byte[] exportedContext) |
| throws GSSException { |
| return new Krb5Context(caller, exportedContext); |
| } |
| |
| |
| public final Oid getMechanismOid() { |
| return GSS_KRB5_MECH_OID; |
| } |
| |
| public Provider getProvider() { |
| return PROVIDER; |
| } |
| |
| public Oid[] getNameTypes() { |
| // nameTypes is cloned in GSSManager.getNamesForMech |
| return nameTypes; |
| } |
| |
| private static Oid createOid(String oidStr) { |
| Oid retVal = null; |
| try { |
| retVal = new Oid(oidStr); |
| } catch (GSSException e) { |
| // Should not happen! |
| } |
| return retVal; |
| } |
| } |
