1 /*
2 * Copyright (C) 2014 Laurent Goujon <lgoujon@twitter.com>
3 * and other copyright owners as documented in the project's IP log.
4 *
5 * This program and the accompanying materials are made available
6 * under the terms of the Eclipse Distribution License v1.0 which
7 * accompanies this distribution, is reproduced below, and is
8 * available at http://www.eclipse.org/org/documents/edl-v10.php
9 *
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials provided
22 * with the distribution.
23 *
24 * - Neither the name of the Eclipse Foundation, Inc. nor the
25 * names of its contributors may be used to endorse or promote
26 * products derived from this software without specific prior
27 * written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
30 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
31 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
34 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
35 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
37 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
38 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
40 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
41 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42 */
43
44 package org.eclipse.jgit.util;
45
46 import java.lang.reflect.Constructor;
47 import java.lang.reflect.InvocationTargetException;
48 import java.net.URL;
49
50 import org.ietf.jgss.GSSManager;
51
52 /**
53 * Factory to detect which GSSManager implementation should be used.
54 *
55 * @since 3.4
56 */
57 public abstract class GSSManagerFactory {
58 /**
59 * Auto-detects the GSSManager factory to use based on system.
60 *
61 * @return detected GSSManager factory
62 */
63 public static GSSManagerFactory detect() {
64 return (SunGSSManagerFactory.isSupported()) ? new SunGSSManagerFactory()
65 : new DefaultGSSManagerFactory();
66 }
67
68 /**
69 * Returns a GSS Manager instance for the provided url
70 *
71 * @param url
72 * the repository url
73 * @return a GSSManager instance
74 */
75 public abstract GSSManager newInstance(URL url);
76
77 /**
78 * DefaultGSSManagerFactory uses @link {@link GSSManager#getInstance()} but
79 * you might need to set
80 * <code>javax.security.auth.useSubjectCredsOnly</code> system property to
81 * <code>false</code> for authentication to work.
82 */
83 private static class DefaultGSSManagerFactory extends GSSManagerFactory {
84 private static final GSSManager INSTANCE = GSSManager.getInstance();
85
86 @Override
87 public GSSManager newInstance(URL url) {
88 return INSTANCE;
89 }
90 }
91
92 private static class SunGSSManagerFactory extends GSSManagerFactory {
93 private static boolean IS_SUPPORTED;
94 private static Constructor<?> HTTP_CALLER_INFO_CONSTRUCTOR;
95 private static Constructor<?> HTTP_CALLER_CONSTRUCTOR;
96
97 private static Constructor<?> GSS_MANAGER_IMPL_CONSTRUCTOR;
98
99 static {
100 try {
101 init();
102 IS_SUPPORTED = true;
103 } catch (Exception e) {
104 IS_SUPPORTED = false;
105 }
106 }
107
108 private static void init() throws ClassNotFoundException,
109 NoSuchMethodException {
110 Class<?> httpCallerInfoClazz = Class
111 .forName("sun.net.www.protocol.http.HttpCallerInfo"); //$NON-NLS-1$
112 HTTP_CALLER_INFO_CONSTRUCTOR = httpCallerInfoClazz
113 .getConstructor(URL.class);
114
115 Class<?> httpCallerClazz = Class
116 .forName("sun.security.jgss.HttpCaller"); //$NON-NLS-1$
117 HTTP_CALLER_CONSTRUCTOR = httpCallerClazz
118 .getConstructor(httpCallerInfoClazz);
119
120 Class<?> gssCallerClazz = Class
121 .forName("sun.security.jgss.GSSCaller"); //$NON-NLS-1$
122 Class<?> gssManagerImplClazz = Class
123 .forName("sun.security.jgss.GSSManagerImpl"); //$NON-NLS-1$
124 GSS_MANAGER_IMPL_CONSTRUCTOR = gssManagerImplClazz
125 .getConstructor(gssCallerClazz);
126
127 }
128
129 /**
130 * Detects if SunGSSManagerProvider is supported by the system
131 *
132 * @return true if it is supported
133 */
134 public static boolean isSupported() {
135 return IS_SUPPORTED;
136 }
137
138 @Override
139 public GSSManager newInstance(URL url) {
140 try {
141 Object httpCallerInfo = HTTP_CALLER_INFO_CONSTRUCTOR
142 .newInstance(url);
143 Object httpCaller = HTTP_CALLER_CONSTRUCTOR
144 .newInstance(httpCallerInfo);
145
146 return (GSSManager) GSS_MANAGER_IMPL_CONSTRUCTOR
147 .newInstance(httpCaller);
148 } catch (InstantiationException e) {
149 throw new Error(e);
150 } catch (IllegalAccessException e) {
151 throw new Error(e);
152 } catch (IllegalArgumentException e) {
153 throw new Error(e);
154 } catch (InvocationTargetException e) {
155 throw new Error(e);
156 }
157 }
158 }
159 }