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1
25 package org.objectweb.carol.util.csiv2.gss;
26
27 import java.io.ByteArrayInputStream  ;
28 import java.io.ByteArrayOutputStream ;
29 import java.io.IOException ;
30 import java.io.UnsupportedEncodingException ;
31
32 import org.ietf.jgss.GSSException ;
33 import org.ietf.jgss.Oid ;
34 import org.omg.GSSUP.GSSUPMechOID;
35
36 import org.objectweb.carol.util.configuration.TraceCarol;
37
38
39
40
44 public class GSSHelper {
45
46
49 private static final byte[] EXPORTED_NAME_TOK_ID = new byte[]{0x04, 0x01};
50
51
54 private static final int[] TWO_BYTES = {0xFF00, 0xFF};
55
56
59 private static final int[] FOUR_BYTES = {0xFF000000, 0xFF0000, 0xFF00, 0xFF};
60
61
64 private static final int BYTES = 0xFF;
65
66
69 private static final int SEQUENCE = 0x60;
70
71
74 private static final int OBJECT_IDENTIFIER = 0x06;
75
76
77
80 private GSSHelper() {
81
82 }
83
84
85
146
147
153 public static byte[] encodeExported(String name) {
154
155 byte[] mechOidDer = GSSHelper.getMechOidDer();
156 byte[] nameBytes = null;
157 try {
158 nameBytes = name.getBytes("UTF-8");
160 } catch (UnsupportedEncodingException uee) {
161 throw new IllegalStateException ("Cannot get utf-8 encoding" + uee.getMessage());
162 }
163 int nameLength = name.length();
164
165 ByteArrayOutputStream bos = new ByteArrayOutputStream ();
168 bos.write(EXPORTED_NAME_TOK_ID[0]);
169 bos.write(EXPORTED_NAME_TOK_ID[1]);
170
171 int mechOidLength = mechOidDer.length;
173 bos.write(mechOidLength & TWO_BYTES[0]);
174 bos.write(mechOidLength & TWO_BYTES[1]);
175
176 bos.write(mechOidDer, 0, mechOidDer.length);
178
179 bos.write(nameLength & FOUR_BYTES[0]);
181 bos.write(nameLength & FOUR_BYTES[1]);
182 bos.write(nameLength & FOUR_BYTES[2]);
183 bos.write(nameLength & FOUR_BYTES[3]);
184
185 bos.write(nameBytes, 0, nameBytes.length);
187 return bos.toByteArray();
188
189 }
190
191
196 public static String decodeExported(byte[] toDecode) throws Exception {
197
198 ByteArrayInputStream bis = new ByteArrayInputStream (toDecode);
199
200 if (bis.read() != EXPORTED_NAME_TOK_ID[0] || bis.read() != EXPORTED_NAME_TOK_ID[1]) {
202 throw new IllegalArgumentException ("Invalid header, this is not an exported name");
203 }
204
205 int mechOidLength = bis.read() * 8 + bis.read();
207
208 byte[] mechOidDerTemplate = GSSHelper.getMechOidDer();
210 byte[] mechOidDer = new byte[mechOidLength];
211 int success = bis.read(mechOidDer);
212 if (success == -1 || success != mechOidDerTemplate.length) {
213 throw new IllegalArgumentException ("Not able to decode name, length is incorrect");
214 } else {
215 for (int b = 0; b < mechOidDerTemplate.length; b++) {
217 if (mechOidDer[b] != mechOidDerTemplate[b]) {
218 throw new IllegalArgumentException ("Not a valid MechoID");
219 }
220 }
221 }
222
223 int nameLength = bis.read() * 24 + bis.read() * 16 + bis.read() * 8 + bis.read();
225
226 byte[] name = new byte[nameLength];
227 success = bis.read(name);
228 if (success == -1 || success != nameLength) {
229 throw new IllegalArgumentException ("Not able to decode name, length is incorrect");
230 }
231 return new String (name);
232 }
233
234
238 private static String getMechOID() {
239 return GSSUPMechOID.value.substring(4);
240 }
241
242
243
325 public static byte[] decodeToken(byte[] toExtract) {
326 int b = 0;
327
328 if (toExtract[b++] != SEQUENCE) {
330 throw new IllegalArgumentException ("Invalid token");
331 }
332
333 int tokenLegnth = 0;
336 int lengthTmp = toExtract[b++];
337
338 if ((lengthTmp & 128) == 128) { int additionalOctets = lengthTmp & 0x7f;
344 for (int i = 0; i < additionalOctets; i++) {
345 tokenLegnth = (tokenLegnth << 8) + (toExtract[b++] & BYTES);
346 }
347 } else {
348 tokenLegnth = lengthTmp;
350 }
351
352
353 if (toExtract[b] != OBJECT_IDENTIFIER) { throw new IllegalArgumentException ("Invalid object identifier");
356 }
357
358 byte[] mechOidDerTemplate = GSSHelper.getMechOidDer();
360 for (int i = 0; i < mechOidDerTemplate.length; i++) {
362 if (toExtract[b++] != mechOidDerTemplate[i]) {
363 throw new IllegalArgumentException ("Not a valid MechoID");
364 }
365 }
366
367 int objLength = toExtract.length - b;
370 byte[] objId = new byte[objLength];
371 System.arraycopy(toExtract, b, objId, 0, objLength);
372
373 return objId;
374
375 }
376
377
383 public static byte[] encodeToken(byte[] contextData) throws IOException {
384
385 byte[] mechOidDer = GSSHelper.getMechOidDer();
386 int mechOidLength = mechOidDer.length;
387 int contextDataLength = contextData.length;
388
389 ByteArrayOutputStream bos = new ByteArrayOutputStream ();
390
391 bos.write(SEQUENCE);
393
394
395 bos.write(mechOidLength + contextDataLength);
397
398 bos.write(mechOidDer);
400
401 bos.write(contextData);
403
404 return bos.toByteArray();
405 }
406
407
408
411 public static byte[] getMechOidDer() {
412 Oid oid = null;
413 byte[] gssupDerEncoding = null;
414 try {
415 oid = new Oid (getMechOID());
416 gssupDerEncoding = oid.getDER();
417 } catch (GSSException gsse) {
418 TraceCarol.error("Error while getting MechOID");
419 return null;
420 }
421 return gssupDerEncoding;
422 }
423
424 }
425 |
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