1 /*
2 * Copyright (c) 2005, 2006, 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 sun.security.smartcardio;
27
28 import java.nio.*;
29 import java.security.AccessController;
30 import java.security.PrivilegedAction;
31
32 import javax.smartcardio.*;
33
34 import static sun.security.smartcardio.PCSC.*;
35
36 /**
37 * CardChannel implementation.
38 *
39 * @since 1.6
40 * @author Andreas Sterbenz
41 */
42 final class ChannelImpl extends CardChannel {
43
44 // the card this channel is associated with
45 private final CardImpl card;
46
47 // the channel number, 0 for the basic logical channel
48 private final int channel;
49
50 // whether this channel has been closed. only logical channels can be closed
51 private volatile boolean isClosed;
52
53 ChannelImpl(CardImpl card, int channel) {
54 this.card = card;
55 this.channel = channel;
56 }
57
58 void checkClosed() {
59 card.checkState();
60 if (isClosed) {
61 throw new IllegalStateException("Logical channel has been closed");
62 }
63 }
64
65 public Card getCard() {
66 return card;
67 }
68
69 public int getChannelNumber() {
70 checkClosed();
71 return channel;
72 }
73
74 private static void checkManageChannel(byte[] b) {
75 if (b.length < 4) {
76 throw new IllegalArgumentException
77 ("Command APDU must be at least 4 bytes long");
78 }
79 if ((b[0] >= 0) && (b[1] == 0x70)) {
80 throw new IllegalArgumentException
81 ("Manage channel command not allowed, use openLogicalChannel()");
82 }
83 }
84
85 public ResponseAPDU transmit(CommandAPDU command) throws CardException {
86 checkClosed();
87 card.checkExclusive();
88 byte[] commandBytes = command.getBytes();
89 byte[] responseBytes = doTransmit(commandBytes);
90 return new ResponseAPDU(responseBytes);
91 }
92
93 public int transmit(ByteBuffer command, ByteBuffer response) throws CardException {
94 checkClosed();
95 card.checkExclusive();
96 if ((command == null) || (response == null)) {
97 throw new NullPointerException();
98 }
99 if (response.isReadOnly()) {
100 throw new ReadOnlyBufferException();
101 }
102 if (command == response) {
103 throw new IllegalArgumentException
104 ("command and response must not be the same object");
105 }
106 if (response.remaining() < 258) {
107 throw new IllegalArgumentException
108 ("Insufficient space in response buffer");
109 }
110 byte[] commandBytes = new byte[command.remaining()];
111 command.get(commandBytes);
112 byte[] responseBytes = doTransmit(commandBytes);
113 response.put(responseBytes);
114 return responseBytes.length;
115 }
116
117 private final static boolean t0GetResponse =
118 getBooleanProperty("sun.security.smartcardio.t0GetResponse", true);
119
120 private final static boolean t1GetResponse =
121 getBooleanProperty("sun.security.smartcardio.t1GetResponse", true);
122
123 private final static boolean t1StripLe =
124 getBooleanProperty("sun.security.smartcardio.t1StripLe", false);
125
126 private static boolean getBooleanProperty(String name, boolean def) {
127 String val = AccessController.doPrivileged(
128 (PrivilegedAction<String>) () -> System.getProperty(name));
129 if (val == null) {
130 return def;
131 }
132 if (val.equalsIgnoreCase("true")) {
133 return true;
134 } else if (val.equalsIgnoreCase("false")) {
135 return false;
136 } else {
137 throw new IllegalArgumentException
138 (name + " must be either 'true' or 'false'");
139 }
140 }
141
142 private byte[] concat(byte[] b1, byte[] b2, int n2) {
143 int n1 = b1.length;
144 if ((n1 == 0) && (n2 == b2.length)) {
145 return b2;
146 }
147 byte[] res = new byte[n1 + n2];
148 System.arraycopy(b1, 0, res, 0, n1);
149 System.arraycopy(b2, 0, res, n1, n2);
150 return res;
151 }
152
153 private final static byte[] B0 = new byte[0];
154
155 private byte[] doTransmit(byte[] command) throws CardException {
156 // note that we modify the 'command' array in some cases, so it must
157 // be a copy of the application provided data.
158 try {
159 checkManageChannel(command);
160 setChannel(command);
161 int n = command.length;
162 boolean t0 = card.protocol == SCARD_PROTOCOL_T0;
163 boolean t1 = card.protocol == SCARD_PROTOCOL_T1;
164 if (t0 && (n >= 7) && (command[4] == 0)) {
165 throw new CardException
166 ("Extended length forms not supported for T=0");
167 }
168 if ((t0 || (t1 && t1StripLe)) && (n >= 7)) {
169 int lc = command[4] & 0xff;
170 if (lc != 0) {
171 if (n == lc + 6) {
172 n--;
173 }
174 } else {
175 lc = ((command[5] & 0xff) << 8) | (command[6] & 0xff);
176 if (n == lc + 9) {
177 n -= 2;
178 }
179 }
180 }
181 boolean getresponse = (t0 && t0GetResponse) || (t1 && t1GetResponse);
182 int k = 0;
183 byte[] result = B0;
184 while (true) {
185 if (++k >= 32) {
186 throw new CardException("Could not obtain response");
187 }
188 byte[] response = SCardTransmit
189 (card.cardId, card.protocol, command, 0, n);
190 int rn = response.length;
191 if (getresponse && (rn >= 2)) {
192 // see ISO 7816/2005, 5.1.3
193 if ((rn == 2) && (response[0] == 0x6c)) {
194 // Resend command using SW2 as short Le field
195 command[n - 1] = response[1];
196 continue;
197 }
198 if (response[rn - 2] == 0x61) {
199 // Issue a GET RESPONSE command with the same CLA
200 // using SW2 as short Le field
201 if (rn > 2) {
202 result = concat(result, response, rn - 2);
203 }
204 command[1] = (byte)0xC0;
205 command[2] = 0;
206 command[3] = 0;
207 command[4] = response[rn - 1];
208 n = 5;
209 continue;
210 }
211
212 }
213 result = concat(result, response, rn);
214 break;
215 }
216 return result;
217 } catch (PCSCException e) {
218 card.handleError(e);
219 throw new CardException(e);
220 }
221 }
222
223 private static int getSW(byte[] res) throws CardException {
224 if (res.length < 2) {
225 throw new CardException("Invalid response length: " + res.length);
226 }
227 int sw1 = res[res.length - 2] & 0xff;
228 int sw2 = res[res.length - 1] & 0xff;
229 return (sw1 << 8) | sw2;
230 }
231
232 private static boolean isOK(byte[] res) throws CardException {
233 return (res.length == 2) && (getSW(res) == 0x9000);
234 }
235
236 private void setChannel(byte[] com) {
237 int cla = com[0];
238 if (cla < 0) {
239 // proprietary class format, cannot set or check logical channel
240 // for now, just return
241 return;
242 }
243 // classes 001x xxxx is reserved for future use in ISO, ignore
244 if ((cla & 0xe0) == 0x20) {
245 return;
246 }
247 // see ISO 7816/2005, table 2 and 3
248 if (channel <= 3) {
249 // mask of bits 7, 1, 0 (channel number)
250 // 0xbc == 1011 1100
251 com[0] &= 0xbc;
252 com[0] |= channel;
253 } else if (channel <= 19) {
254 // mask of bits 7, 3, 2, 1, 0 (channel number)
255 // 0xbc == 1011 0000
256 com[0] &= 0xb0;
257 com[0] |= 0x40;
258 com[0] |= (channel - 4);
259 } else {
260 throw new RuntimeException("Unsupported channel number: " + channel);
261 }
262 }
263
264 public void close() throws CardException {
265 if (getChannelNumber() == 0) {
266 throw new IllegalStateException("Cannot close basic logical channel");
267 }
268 if (isClosed) {
269 return;
270 }
271 card.checkExclusive();
272 try {
273 byte[] com = new byte[] {0x00, 0x70, (byte)0x80, 0};
274 com[3] = (byte)getChannelNumber();
275 setChannel(com);
276 byte[] res = SCardTransmit(card.cardId, card.protocol, com, 0, com.length);
277 if (isOK(res) == false) {
278 throw new CardException("close() failed: " + PCSC.toString(res));
279 }
280 } catch (PCSCException e) {
281 card.handleError(e);
282 throw new CardException("Could not close channel", e);
283 } finally {
284 isClosed = true;
285 }
286 }
287
288 public String toString() {
289 return "PC/SC channel " + channel;
290 }
291
292 }