1 /* 2 * Copyright (c) 2009, 2013, Oracle and/or its affiliates. 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package com.sun.security.jgss; 27 28 import org.ietf.jgss.*; 29 30 /** 31 * The extended GSSContext interface for supporting additional 32 * functionalities not defined by {@code org.ietf.jgss.GSSContext}, 33 * such as querying context-specific attributes. 34 */ 35 public interface ExtendedGSSContext extends GSSContext { 36 37 /** 38 * Return the mechanism-specific attribute associated with {@code type}. 39 * <p> 40 * If there is a security manager, an {@link InquireSecContextPermission} 41 * with the name {@code type.mech} must be granted. Otherwise, this could 42 * result in a {@link SecurityException}. 43 * <p> 44 * Example: 45 * <pre> 46 * GSSContext ctxt = m.createContext(...) 47 * // Establishing the context 48 * if (ctxt instanceof ExtendedGSSContext) { 49 * ExtendedGSSContext ex = (ExtendedGSSContext)ctxt; 50 * try { 51 * Key key = (key)ex.inquireSecContext( 52 * InquireType.KRB5_GET_SESSION_KEY); 53 * // read key info 54 * } catch (GSSException gsse) { 55 * // deal with exception 56 * } 57 * } 58 * </pre> 59 * @param type the type of the attribute requested 60 * @return the attribute, see the method documentation for details. 61 * @throws GSSException containing the following 62 * major error codes: 63 * {@link GSSException#BAD_MECH GSSException.BAD_MECH} if the mechanism 64 * does not support this method, 65 * {@link GSSException#UNAVAILABLE GSSException.UNAVAILABLE} if the 66 * type specified is not supported, 67 * {@link GSSException#NO_CONTEXT GSSException.NO_CONTEXT} if the 68 * security context is invalid, 69 * {@link GSSException#FAILURE GSSException.FAILURE} for other 70 * unspecified failures. 71 * @throws SecurityException if a security manager exists and a proper 72 * {@link InquireSecContextPermission} is not granted. 73 * @see InquireSecContextPermission 74 * @see InquireType 75 */ inquireSecContext(InquireType type)76 public Object inquireSecContext(InquireType type) 77 throws GSSException; 78 79 /** 80 * Requests that the delegation policy be respected. When a true value is 81 * requested, the underlying context would use the delegation policy 82 * defined by the environment as a hint to determine whether credentials 83 * delegation should be performed. This request can only be made on the 84 * context initiator's side and it has to be done prior to the first 85 * call to <code>initSecContext</code>. 86 * <p> 87 * When this flag is false, delegation will only be tried when the 88 * {@link GSSContext#requestCredDeleg(boolean) credentials delegation flag} 89 * is true. 90 * <p> 91 * When this flag is true but the 92 * {@link GSSContext#requestCredDeleg(boolean) credentials delegation flag} 93 * is false, delegation will be only tried if the delegation policy permits 94 * delegation. 95 * <p> 96 * When both this flag and the 97 * {@link GSSContext#requestCredDeleg(boolean) credentials delegation flag} 98 * are true, delegation will be always tried. However, if the delegation 99 * policy does not permit delegation, the value of 100 * {@link #getDelegPolicyState} will be false, even 101 * if delegation is performed successfully. 102 * <p> 103 * In any case, if the delegation is not successful, the value returned 104 * by {@link GSSContext#getCredDelegState()} is false, and the value 105 * returned by {@link #getDelegPolicyState()} is also false. 106 * <p> 107 * Not all mechanisms support delegation policy. Therefore, the 108 * application should check to see if the request was honored with the 109 * {@link #getDelegPolicyState() getDelegPolicyState} method. When 110 * delegation policy is not supported, <code>requestDelegPolicy</code> 111 * should return silently without throwing an exception. 112 * <p> 113 * Note: for the Kerberos 5 mechanism, the delegation policy is expressed 114 * through the OK-AS-DELEGATE flag in the service ticket. When it's true, 115 * the KDC permits delegation to the target server. In a cross-realm 116 * environment, in order for delegation be permitted, all cross-realm TGTs 117 * on the authentication path must also have the OK-AS-DELAGATE flags set. 118 * @param state true if the policy should be respected 119 * @throws GSSException containing the following 120 * major error codes: 121 * {@link GSSException#FAILURE GSSException.FAILURE} 122 */ requestDelegPolicy(boolean state)123 public void requestDelegPolicy(boolean state) throws GSSException; 124 125 /** 126 * Returns the delegation policy response. Called after a security context 127 * is established. This method can be only called on the initiator's side. 128 * See {@link ExtendedGSSContext#requestDelegPolicy}. 129 * @return the delegation policy response 130 */ getDelegPolicyState()131 public boolean getDelegPolicyState(); 132 } 133