J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2000-2006 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.security.jgss.krb5; |
| 27 | |
| 28 | import org.ietf.jgss.*; |
| 29 | import sun.security.jgss.GSSUtil; |
| 30 | import sun.security.jgss.spi.*; |
| 31 | import javax.security.auth.kerberos.ServicePermission; |
| 32 | import java.security.Provider; |
| 33 | import sun.security.util.DerOutputStream; |
| 34 | import sun.security.util.ObjectIdentifier; |
| 35 | import java.io.IOException; |
| 36 | import java.util.Vector; |
| 37 | |
| 38 | /** |
| 39 | * Krb5 Mechanism plug in for JGSS |
| 40 | * This is the properties object required by the JGSS framework. |
| 41 | * All mechanism specific information is defined here. |
| 42 | * |
| 43 | * @author Mayank Upadhyay |
| 44 | */ |
| 45 | |
| 46 | public final class Krb5MechFactory implements MechanismFactory { |
| 47 | |
| 48 | private static final boolean DEBUG = Krb5Util.DEBUG; |
| 49 | |
| 50 | static final Provider PROVIDER = |
| 51 | new sun.security.jgss.SunProvider(); |
| 52 | |
| 53 | static final Oid GSS_KRB5_MECH_OID = |
| 54 | createOid("1.2.840.113554.1.2.2"); |
| 55 | |
| 56 | static final Oid NT_GSS_KRB5_PRINCIPAL = |
| 57 | createOid("1.2.840.113554.1.2.2.1"); |
| 58 | |
| 59 | private static Oid[] nameTypes = |
| 60 | new Oid[] { GSSName.NT_USER_NAME, |
| 61 | GSSName.NT_HOSTBASED_SERVICE, |
| 62 | GSSName.NT_EXPORT_NAME, |
| 63 | NT_GSS_KRB5_PRINCIPAL}; |
| 64 | |
| 65 | final private int caller; |
| 66 | |
| 67 | private static Krb5CredElement getCredFromSubject(GSSNameSpi name, |
| 68 | boolean initiate) |
| 69 | throws GSSException { |
| 70 | Vector<Krb5CredElement> creds = |
| 71 | GSSUtil.searchSubject(name, GSS_KRB5_MECH_OID, initiate, |
| 72 | (initiate ? |
| 73 | Krb5InitCredential.class : |
| 74 | Krb5AcceptCredential.class)); |
| 75 | |
| 76 | Krb5CredElement result = ((creds == null || creds.isEmpty()) ? |
| 77 | null : creds.firstElement()); |
| 78 | |
| 79 | // Force permission check before returning the cred to caller |
| 80 | if (result != null) { |
| 81 | if (initiate) { |
| 82 | checkInitCredPermission((Krb5NameElement) result.getName()); |
| 83 | } else { |
| 84 | checkAcceptCredPermission |
| 85 | ((Krb5NameElement) result.getName(), name); |
| 86 | } |
| 87 | } |
| 88 | return result; |
| 89 | } |
| 90 | |
| 91 | public Krb5MechFactory(int caller) { |
| 92 | this.caller = caller; |
| 93 | } |
| 94 | |
| 95 | public GSSNameSpi getNameElement(String nameStr, Oid nameType) |
| 96 | throws GSSException { |
| 97 | return Krb5NameElement.getInstance(nameStr, nameType); |
| 98 | } |
| 99 | |
| 100 | public GSSNameSpi getNameElement(byte[] name, Oid nameType) |
| 101 | throws GSSException { |
| 102 | // At this point, even an exported name is stripped down to safe |
| 103 | // bytes only |
| 104 | // XXX Use encoding here |
| 105 | return Krb5NameElement.getInstance(new String(name), nameType); |
| 106 | } |
| 107 | |
| 108 | public GSSCredentialSpi getCredentialElement(GSSNameSpi name, |
| 109 | int initLifetime, int acceptLifetime, |
| 110 | int usage) throws GSSException { |
| 111 | |
| 112 | if (name != null && !(name instanceof Krb5NameElement)) { |
| 113 | name = Krb5NameElement.getInstance(name.toString(), |
| 114 | name.getStringNameType()); |
| 115 | } |
| 116 | |
| 117 | Krb5CredElement credElement = getCredFromSubject |
| 118 | (name, (usage != GSSCredential.ACCEPT_ONLY)); |
| 119 | |
| 120 | if (credElement == null) { |
| 121 | if (usage == GSSCredential.INITIATE_ONLY || |
| 122 | usage == GSSCredential.INITIATE_AND_ACCEPT) { |
| 123 | credElement = Krb5InitCredential.getInstance |
| 124 | (caller, (Krb5NameElement) name, initLifetime); |
| 125 | checkInitCredPermission |
| 126 | ((Krb5NameElement) credElement.getName()); |
| 127 | } else if (usage == GSSCredential.ACCEPT_ONLY) { |
| 128 | credElement = |
| 129 | Krb5AcceptCredential.getInstance(caller, |
| 130 | (Krb5NameElement) name); |
| 131 | checkAcceptCredPermission |
| 132 | ((Krb5NameElement) credElement.getName(), name); |
| 133 | } else |
| 134 | throw new GSSException(GSSException.FAILURE, -1, |
| 135 | "Unknown usage mode requested"); |
| 136 | } |
| 137 | return credElement; |
| 138 | } |
| 139 | |
| 140 | public static void checkInitCredPermission(Krb5NameElement name) { |
| 141 | SecurityManager sm = System.getSecurityManager(); |
| 142 | if (sm != null) { |
| 143 | String realm = (name.getKrb5PrincipalName()).getRealmAsString(); |
| 144 | String tgsPrincipal = |
| 145 | new String("krbtgt/" + realm + '@' + realm); |
| 146 | ServicePermission perm = |
| 147 | new ServicePermission(tgsPrincipal, "initiate"); |
| 148 | try { |
| 149 | sm.checkPermission(perm); |
| 150 | } catch (SecurityException e) { |
| 151 | if (DEBUG) { |
| 152 | System.out.println("Permission to initiate" + |
| 153 | "kerberos init credential" + e.getMessage()); |
| 154 | } |
| 155 | throw e; |
| 156 | } |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | public static void checkAcceptCredPermission(Krb5NameElement name, |
| 161 | GSSNameSpi originalName) { |
| 162 | SecurityManager sm = System.getSecurityManager(); |
| 163 | if (sm != null) { |
| 164 | ServicePermission perm = new ServicePermission |
| 165 | (name.getKrb5PrincipalName().getName(), "accept"); |
| 166 | try { |
| 167 | sm.checkPermission(perm); |
| 168 | } catch (SecurityException e) { |
| 169 | if (originalName == null) { |
| 170 | // Don't disclose the name of the principal |
| 171 | e = new SecurityException("No permission to acquire " |
| 172 | + "Kerberos accept credential"); |
| 173 | // Don't call e.initCause() with caught exception |
| 174 | } |
| 175 | throw e; |
| 176 | } |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | public GSSContextSpi getMechanismContext(GSSNameSpi peer, |
| 181 | GSSCredentialSpi myInitiatorCred, int lifetime) |
| 182 | throws GSSException { |
| 183 | if (peer != null && !(peer instanceof Krb5NameElement)) { |
| 184 | peer = Krb5NameElement.getInstance(peer.toString(), |
| 185 | peer.getStringNameType()); |
| 186 | } |
| 187 | // XXX Convert myInitiatorCred to Krb5CredElement |
| 188 | if (myInitiatorCred == null) { |
| 189 | myInitiatorCred = getCredentialElement(null, lifetime, 0, |
| 190 | GSSCredential.INITIATE_ONLY); |
| 191 | } |
| 192 | return new Krb5Context(caller, (Krb5NameElement)peer, |
| 193 | (Krb5CredElement)myInitiatorCred, lifetime); |
| 194 | } |
| 195 | |
| 196 | public GSSContextSpi getMechanismContext(GSSCredentialSpi myAcceptorCred) |
| 197 | throws GSSException { |
| 198 | // XXX Convert myAcceptorCred to Krb5CredElement |
| 199 | if (myAcceptorCred == null) { |
| 200 | myAcceptorCred = getCredentialElement(null, 0, |
| 201 | GSSCredential.INDEFINITE_LIFETIME, GSSCredential.ACCEPT_ONLY); |
| 202 | } |
| 203 | return new Krb5Context(caller, (Krb5CredElement)myAcceptorCred); |
| 204 | } |
| 205 | |
| 206 | public GSSContextSpi getMechanismContext(byte[] exportedContext) |
| 207 | throws GSSException { |
| 208 | return new Krb5Context(caller, exportedContext); |
| 209 | } |
| 210 | |
| 211 | |
| 212 | public final Oid getMechanismOid() { |
| 213 | return GSS_KRB5_MECH_OID; |
| 214 | } |
| 215 | |
| 216 | public Provider getProvider() { |
| 217 | return PROVIDER; |
| 218 | } |
| 219 | |
| 220 | public Oid[] getNameTypes() { |
| 221 | // nameTypes is cloned in GSSManager.getNamesForMech |
| 222 | return nameTypes; |
| 223 | } |
| 224 | |
| 225 | private static Oid createOid(String oidStr) { |
| 226 | Oid retVal = null; |
| 227 | try { |
| 228 | retVal = new Oid(oidStr); |
| 229 | } catch (GSSException e) { |
| 230 | // Should not happen! |
| 231 | } |
| 232 | return retVal; |
| 233 | } |
| 234 | } |