1 /*
2 * Copyright 2005-2006 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 javax.smartcardio;
27
28 import java.io;
29
30 import java.security.Permission;
31
32 /**
33 * A permission for Smart Card operations. A CardPermission consists of the
34 * name of the card terminal the permission applies to and a set of actions
35 * that are valid for that terminal.
36 *
37 * <p>A CardPermission with a name of <code>*</code> applies to all
38 * card terminals. The actions string is a comma separated list of the actions
39 * listed below, or <code>*</code> to signify "all actions."
40 *
41 * <p>Individual actions are:
42 * <dl>
43 * <dt>connect
44 * <dd>connect to a card using
45 * {@linkplain CardTerminal#connect CardTerminal.connect()}
46 *
47 * <dt>reset
48 * <dd>reset the card using {@linkplain Card#disconnect Card.disconnect(true)}
49 *
50 * <dt>exclusive
51 * <dd>establish exclusive access to a card using
52 * {@linkplain Card#beginExclusive} and {@linkplain Card#endExclusive
53 * endExclusive()}
54 *
55 * <dt>transmitControl
56 * <dd>transmit a control command using
57 * {@linkplain Card#transmitControlCommand Card.transmitControlCommand()}
58 *
59 * <dt>getBasicChannel
60 * <dd>obtain the basic logical channel using
61 * {@linkplain Card#getBasicChannel}
62 *
63 * <dt>openLogicalChannel
64 * <dd>open a new logical channel using
65 * {@linkplain Card#openLogicalChannel}
66 *
67 * </dl>
68 *
69 * @since 1.6
70 * @author Andreas Sterbenz
71 * @author JSR 268 Expert Group
72 */
73 public class CardPermission extends Permission {
74
75 private static final long serialVersionUID = 7146787880530705613L;
76
77 private final static int A_CONNECT = 0x01;
78 private final static int A_EXCLUSIVE = 0x02;
79 private final static int A_GET_BASIC_CHANNEL = 0x04;
80 private final static int A_OPEN_LOGICAL_CHANNEL = 0x08;
81 private final static int A_RESET = 0x10;
82 private final static int A_TRANSMIT_CONTROL = 0x20;
83
84 // sum of all the actions above
85 private final static int A_ALL = 0x3f;
86
87 private final static int[] ARRAY_MASKS = {
88 A_ALL,
89 A_CONNECT,
90 A_EXCLUSIVE,
91 A_GET_BASIC_CHANNEL,
92 A_OPEN_LOGICAL_CHANNEL,
93 A_RESET,
94 A_TRANSMIT_CONTROL,
95 };
96
97 private final static String S_CONNECT = "connect";
98 private final static String S_EXCLUSIVE = "exclusive";
99 private final static String S_GET_BASIC_CHANNEL = "getBasicChannel";
100 private final static String S_OPEN_LOGICAL_CHANNEL = "openLogicalChannel";
101 private final static String S_RESET = "reset";
102 private final static String S_TRANSMIT_CONTROL = "transmitControl";
103
104 private final static String S_ALL = "*";
105
106 private final static String[] ARRAY_STRINGS = {
107 S_ALL,
108 S_CONNECT,
109 S_EXCLUSIVE,
110 S_GET_BASIC_CHANNEL,
111 S_OPEN_LOGICAL_CHANNEL,
112 S_RESET,
113 S_TRANSMIT_CONTROL,
114 };
115
116 private transient int mask;
117
118 /**
119 * @serial
120 */
121 private volatile String actions;
122
123 /**
124 * Constructs a new CardPermission with the specified actions.
125 * <code>terminalName</code> is the name of a CardTerminal or <code>*</code>
126 * if this permission applies to all terminals. <code>actions</code>
127 * contains a comma-separated list of the individual actions
128 * or <code>*</code> to signify all actions. For more information,
129 * see the documentation at the top of this {@linkplain CardPermission
130 * class}.
131 *
132 * @param terminalName the name of the card terminal, or <code>*</code>
133 * @param actions the action string (or null if the set of permitted
134 * actions is empty)
135 *
136 * @throws NullPointerException if terminalName is null
137 * @throws IllegalArgumentException if actions is an invalid actions
138 * specification
139 */
140 public CardPermission(String terminalName, String actions) {
141 super(terminalName);
142 if (terminalName == null) {
143 throw new NullPointerException();
144 }
145 mask = getMask(actions);
146 }
147
148 private static int getMask(String actions) {
149 if ((actions == null) || (actions.length() == 0)) {
150 throw new IllegalArgumentException("actions must not be empty");
151 }
152
153 // try exact matches for simple actions first
154 for (int i = 0; i < ARRAY_STRINGS.length; i++) {
155 if (actions == ARRAY_STRINGS[i]) {
156 return ARRAY_MASKS[i];
157 }
158 }
159
160 if (actions.endsWith(",")) {
161 throw new IllegalArgumentException("Invalid actions: '" + actions + "'");
162 }
163 int mask = 0;
164 String[] split = actions.split(",");
165 outer:
166 for (String s : split) {
167 for (int i = 0; i < ARRAY_STRINGS.length; i++) {
168 if (ARRAY_STRINGS[i].equalsIgnoreCase(s)) {
169 mask |= ARRAY_MASKS[i];
170 continue outer;
171 }
172 }
173 throw new IllegalArgumentException("Invalid action: '" + s + "'");
174 }
175
176 return mask;
177 }
178
179 private static String getActions(int mask) {
180 if (mask == A_ALL) {
181 return S_ALL;
182 }
183 boolean first = true;
184 StringBuilder sb = new StringBuilder();
185 for (int i = 0; i < ARRAY_MASKS.length; i++) {
186 int action = ARRAY_MASKS[i];
187 if ((mask & action) == action) {
188 if (first == false) {
189 sb.append(",");
190 } else {
191 first = false;
192 }
193 sb.append(ARRAY_STRINGS[i]);
194 }
195 }
196 return sb.toString();
197 }
198
199
200 /**
201 * Returns the canonical string representation of the actions.
202 * It is <code>*</code> to signify all actions defined by this class or
203 * the string concatenation of the comma-separated,
204 * lexicographically sorted list of individual actions.
205 *
206 * @return the canonical string representation of the actions.
207 */
208 public String getActions() {
209 if (actions == null) {
210 actions = getActions(mask);
211 }
212 return actions;
213 }
214
215 /**
216 * Checks if this CardPermission object implies the specified permission.
217 * That is the case, if and only if
218 * <ul>
219 * <li><p><code>permission</code> is an instance of CardPermission,</p>
220 * <li><p><code>permission</code>'s actions are a proper subset of this
221 * object's actions, and</p>
222 * <li><p>this object's <code>getName()</code> method is either
223 * <code>*</code> or equal to <code>permission</code>'s <code>name</code>.
224 * </p>
225 * </ul>
226 *
227 * @param permission the permission to check against
228 * @return true if and only if this CardPermission object implies the
229 * specified permission.
230 */
231 public boolean implies(Permission permission) {
232 if (permission instanceof CardPermission == false) {
233 return false;
234 }
235 CardPermission other = (CardPermission)permission;
236 if ((this.mask & other.mask) != other.mask) {
237 return false;
238 }
239 String thisName = getName();
240 if (thisName.equals("*")) {
241 return true;
242 }
243 if (thisName.equals(other.getName())) {
244 return true;
245 }
246 return false;
247 }
248
249 /**
250 * Compares the specified object with this CardPermission for equality.
251 * This CardPermission is equal to another Object <code>object</code>, if
252 * and only if
253 * <ul>
254 * <li><p><code>object</code> is an instance of CardPermission,</p>
255 * <li><p><code>this.getName()</code> is equal to
256 * <code>((CardPermission)object).getName()</code>, and</p>
257 * <li><p><code>this.getActions()</code> is equal to
258 * <code>((CardPermission)object).getActions()</code>.</p>
259 * </ul>
260 *
261 * @param obj the object to be compared for equality with this CardPermission
262 * @return true if and only if the specified object is equal to this
263 * CardPermission
264 */
265 public boolean equals(Object obj) {
266 if (this == obj) {
267 return true;
268 }
269 if (obj instanceof CardPermission == false) {
270 return false;
271 }
272 CardPermission other = (CardPermission)obj;
273 return this.getName().equals(other.getName()) && (this.mask == other.mask);
274 }
275
276 /**
277 * Returns the hash code value for this CardPermission object.
278 *
279 * @return the hash code value for this CardPermission object.
280 */
281 public int hashCode() {
282 return getName().hashCode() + 31 * mask;
283 }
284
285 private void writeObject(ObjectOutputStream s) throws IOException {
286 // Write out the actions. The superclass takes care of the name.
287 // Call getActions to make sure actions field is initialized
288 if (actions == null) {
289 getActions();
290 }
291 s.defaultWriteObject();
292 }
293
294 private void readObject(ObjectInputStream s)
295 throws IOException, ClassNotFoundException {
296 // Read in the actions, then restore the mask.
297 s.defaultReadObject();
298 mask = getMask(actions);
299 }
300
301 }
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