Subject.java 53.3 KB
Newer Older
D
duke 已提交
1
/*
2
 * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved.
D
duke 已提交
3 4 5 6
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
7
 * published by the Free Software Foundation.  Oracle designates this
D
duke 已提交
8
 * particular file as subject to the "Classpath" exception as provided
9
 * by Oracle in the LICENSE file that accompanied this code.
D
duke 已提交
10 11 12 13 14 15 16 17 18 19 20
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
21 22 23
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
D
duke 已提交
24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206
 */

package javax.security.auth;

import java.util.*;
import java.io.*;
import java.lang.reflect.*;
import java.text.MessageFormat;
import java.security.AccessController;
import java.security.AccessControlContext;
import java.security.DomainCombiner;
import java.security.Permission;
import java.security.PermissionCollection;
import java.security.Principal;
import java.security.PrivilegedAction;
import java.security.PrivilegedExceptionAction;
import java.security.PrivilegedActionException;
import java.security.ProtectionDomain;
import sun.security.util.ResourcesMgr;

/**
 * <p> A <code>Subject</code> represents a grouping of related information
 * for a single entity, such as a person.
 * Such information includes the Subject's identities as well as
 * its security-related attributes
 * (passwords and cryptographic keys, for example).
 *
 * <p> Subjects may potentially have multiple identities.
 * Each identity is represented as a <code>Principal</code>
 * within the <code>Subject</code>.  Principals simply bind names to a
 * <code>Subject</code>.  For example, a <code>Subject</code> that happens
 * to be a person, Alice, might have two Principals:
 * one which binds "Alice Bar", the name on her driver license,
 * to the <code>Subject</code>, and another which binds,
 * "999-99-9999", the number on her student identification card,
 * to the <code>Subject</code>.  Both Principals refer to the same
 * <code>Subject</code> even though each has a different name.
 *
 * <p> A <code>Subject</code> may also own security-related attributes,
 * which are referred to as credentials.
 * Sensitive credentials that require special protection, such as
 * private cryptographic keys, are stored within a private credential
 * <code>Set</code>.  Credentials intended to be shared, such as
 * public key certificates or Kerberos server tickets are stored
 * within a public credential <code>Set</code>.  Different permissions
 * are required to access and modify the different credential Sets.
 *
 * <p> To retrieve all the Principals associated with a <code>Subject</code>,
 * invoke the <code>getPrincipals</code> method.  To retrieve
 * all the public or private credentials belonging to a <code>Subject</code>,
 * invoke the <code>getPublicCredentials</code> method or
 * <code>getPrivateCredentials</code> method, respectively.
 * To modify the returned <code>Set</code> of Principals and credentials,
 * use the methods defined in the <code>Set</code> class.
 * For example:
 * <pre>
 *      Subject subject;
 *      Principal principal;
 *      Object credential;
 *
 *      // add a Principal and credential to the Subject
 *      subject.getPrincipals().add(principal);
 *      subject.getPublicCredentials().add(credential);
 * </pre>
 *
 * <p> This <code>Subject</code> class implements <code>Serializable</code>.
 * While the Principals associated with the <code>Subject</code> are serialized,
 * the credentials associated with the <code>Subject</code> are not.
 * Note that the <code>java.security.Principal</code> class
 * does not implement <code>Serializable</code>.  Therefore all concrete
 * <code>Principal</code> implementations associated with Subjects
 * must implement <code>Serializable</code>.
 *
 * @see java.security.Principal
 * @see java.security.DomainCombiner
 */
public final class Subject implements java.io.Serializable {

    private static final long serialVersionUID = -8308522755600156056L;

    /**
     * A <code>Set</code> that provides a view of all of this
     * Subject's Principals
     *
     * <p>
     *
     * @serial Each element in this set is a
     *          <code>java.security.Principal</code>.
     *          The set is a <code>Subject.SecureSet</code>.
     */
    Set<Principal> principals;

    /**
     * Sets that provide a view of all of this
     * Subject's Credentials
     */
    transient Set<Object> pubCredentials;
    transient Set<Object> privCredentials;

    /**
     * Whether this Subject is read-only
     *
     * @serial
     */
    private volatile boolean readOnly = false;

    private static final int PRINCIPAL_SET = 1;
    private static final int PUB_CREDENTIAL_SET = 2;
    private static final int PRIV_CREDENTIAL_SET = 3;

    private static final ProtectionDomain[] NULL_PD_ARRAY
        = new ProtectionDomain[0];

    /**
     * Create an instance of a <code>Subject</code>
     * with an empty <code>Set</code> of Principals and empty
     * Sets of public and private credentials.
     *
     * <p> The newly constructed Sets check whether this <code>Subject</code>
     * has been set read-only before permitting subsequent modifications.
     * The newly created Sets also prevent illegal modifications
     * by ensuring that callers have sufficient permissions.
     *
     * <p> To modify the Principals Set, the caller must have
     * <code>AuthPermission("modifyPrincipals")</code>.
     * To modify the public credential Set, the caller must have
     * <code>AuthPermission("modifyPublicCredentials")</code>.
     * To modify the private credential Set, the caller must have
     * <code>AuthPermission("modifyPrivateCredentials")</code>.
     */
    public Subject() {

        this.principals = Collections.synchronizedSet
                        (new SecureSet<Principal>(this, PRINCIPAL_SET));
        this.pubCredentials = Collections.synchronizedSet
                        (new SecureSet<Object>(this, PUB_CREDENTIAL_SET));
        this.privCredentials = Collections.synchronizedSet
                        (new SecureSet<Object>(this, PRIV_CREDENTIAL_SET));
    }

    /**
     * Create an instance of a <code>Subject</code> with
     * Principals and credentials.
     *
     * <p> The Principals and credentials from the specified Sets
     * are copied into newly constructed Sets.
     * These newly created Sets check whether this <code>Subject</code>
     * has been set read-only before permitting subsequent modifications.
     * The newly created Sets also prevent illegal modifications
     * by ensuring that callers have sufficient permissions.
     *
     * <p> To modify the Principals Set, the caller must have
     * <code>AuthPermission("modifyPrincipals")</code>.
     * To modify the public credential Set, the caller must have
     * <code>AuthPermission("modifyPublicCredentials")</code>.
     * To modify the private credential Set, the caller must have
     * <code>AuthPermission("modifyPrivateCredentials")</code>.
     * <p>
     *
     * @param readOnly true if the <code>Subject</code> is to be read-only,
     *          and false otherwise. <p>
     *
     * @param principals the <code>Set</code> of Principals
     *          to be associated with this <code>Subject</code>. <p>
     *
     * @param pubCredentials the <code>Set</code> of public credentials
     *          to be associated with this <code>Subject</code>. <p>
     *
     * @param privCredentials the <code>Set</code> of private credentials
     *          to be associated with this <code>Subject</code>.
     *
     * @exception NullPointerException if the specified
     *          <code>principals</code>, <code>pubCredentials</code>,
     *          or <code>privCredentials</code> are <code>null</code>.
     */
    public Subject(boolean readOnly, Set<? extends Principal> principals,
                   Set<?> pubCredentials, Set<?> privCredentials)
    {

        if (principals == null ||
            pubCredentials == null ||
            privCredentials == null)
            throw new NullPointerException
207
                (ResourcesMgr.getString("invalid.null.input.s."));
D
duke 已提交
208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240

        this.principals = Collections.synchronizedSet(new SecureSet<Principal>
                                (this, PRINCIPAL_SET, principals));
        this.pubCredentials = Collections.synchronizedSet(new SecureSet<Object>
                                (this, PUB_CREDENTIAL_SET, pubCredentials));
        this.privCredentials = Collections.synchronizedSet(new SecureSet<Object>
                                (this, PRIV_CREDENTIAL_SET, privCredentials));
        this.readOnly = readOnly;
    }

    /**
     * Set this <code>Subject</code> to be read-only.
     *
     * <p> Modifications (additions and removals) to this Subject's
     * <code>Principal</code> <code>Set</code> and
     * credential Sets will be disallowed.
     * The <code>destroy</code> operation on this Subject's credentials will
     * still be permitted.
     *
     * <p> Subsequent attempts to modify the Subject's <code>Principal</code>
     * and credential Sets will result in an
     * <code>IllegalStateException</code> being thrown.
     * Also, once a <code>Subject</code> is read-only,
     * it can not be reset to being writable again.
     *
     * <p>
     *
     * @exception SecurityException if the caller does not have permission
     *          to set this <code>Subject</code> to be read-only.
     */
    public void setReadOnly() {
        java.lang.SecurityManager sm = System.getSecurityManager();
        if (sm != null) {
241
            sm.checkPermission(AuthPermissionHolder.SET_READ_ONLY_PERMISSION);
D
duke 已提交
242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286
        }

        this.readOnly = true;
    }

    /**
     * Query whether this <code>Subject</code> is read-only.
     *
     * <p>
     *
     * @return true if this <code>Subject</code> is read-only, false otherwise.
     */
    public boolean isReadOnly() {
        return this.readOnly;
    }

    /**
     * Get the <code>Subject</code> associated with the provided
     * <code>AccessControlContext</code>.
     *
     * <p> The <code>AccessControlContext</code> may contain many
     * Subjects (from nested <code>doAs</code> calls).
     * In this situation, the most recent <code>Subject</code> associated
     * with the <code>AccessControlContext</code> is returned.
     *
     * <p>
     *
     * @param  acc the <code>AccessControlContext</code> from which to retrieve
     *          the <code>Subject</code>.
     *
     * @return  the <code>Subject</code> associated with the provided
     *          <code>AccessControlContext</code>, or <code>null</code>
     *          if no <code>Subject</code> is associated
     *          with the provided <code>AccessControlContext</code>.
     *
     * @exception SecurityException if the caller does not have permission
     *          to get the <code>Subject</code>. <p>
     *
     * @exception NullPointerException if the provided
     *          <code>AccessControlContext</code> is <code>null</code>.
     */
    public static Subject getSubject(final AccessControlContext acc) {

        java.lang.SecurityManager sm = System.getSecurityManager();
        if (sm != null) {
287
            sm.checkPermission(AuthPermissionHolder.GET_SUBJECT_PERMISSION);
D
duke 已提交
288 289 290 291
        }

        if (acc == null) {
            throw new NullPointerException(ResourcesMgr.getString
292
                ("invalid.null.AccessControlContext.provided"));
D
duke 已提交
293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344
        }

        // return the Subject from the DomainCombiner of the provided context
        return AccessController.doPrivileged
            (new java.security.PrivilegedAction<Subject>() {
            public Subject run() {
                DomainCombiner dc = acc.getDomainCombiner();
                if (!(dc instanceof SubjectDomainCombiner))
                    return null;
                SubjectDomainCombiner sdc = (SubjectDomainCombiner)dc;
                return sdc.getSubject();
            }
        });
    }

    /**
     * Perform work as a particular <code>Subject</code>.
     *
     * <p> This method first retrieves the current Thread's
     * <code>AccessControlContext</code> via
     * <code>AccessController.getContext</code>,
     * and then instantiates a new <code>AccessControlContext</code>
     * using the retrieved context along with a new
     * <code>SubjectDomainCombiner</code> (constructed using
     * the provided <code>Subject</code>).
     * Finally, this method invokes <code>AccessController.doPrivileged</code>,
     * passing it the provided <code>PrivilegedAction</code>,
     * as well as the newly constructed <code>AccessControlContext</code>.
     *
     * <p>
     *
     * @param subject the <code>Subject</code> that the specified
     *                  <code>action</code> will run as.  This parameter
     *                  may be <code>null</code>. <p>
     *
     * @param action the code to be run as the specified
     *                  <code>Subject</code>. <p>
     *
     * @return the value returned by the PrivilegedAction's
     *                  <code>run</code> method.
     *
     * @exception NullPointerException if the <code>PrivilegedAction</code>
     *                  is <code>null</code>. <p>
     *
     * @exception SecurityException if the caller does not have permission
     *                  to invoke this method.
     */
    public static <T> T doAs(final Subject subject,
                        final java.security.PrivilegedAction<T> action) {

        java.lang.SecurityManager sm = System.getSecurityManager();
        if (sm != null) {
345
            sm.checkPermission(AuthPermissionHolder.DO_AS_PERMISSION);
D
duke 已提交
346 347 348
        }
        if (action == null)
            throw new NullPointerException
349
                (ResourcesMgr.getString("invalid.null.action.provided"));
D
duke 已提交
350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403

        // set up the new Subject-based AccessControlContext
        // for doPrivileged
        final AccessControlContext currentAcc = AccessController.getContext();

        // call doPrivileged and push this new context on the stack
        return java.security.AccessController.doPrivileged
                                        (action,
                                        createContext(subject, currentAcc));
    }

    /**
     * Perform work as a particular <code>Subject</code>.
     *
     * <p> This method first retrieves the current Thread's
     * <code>AccessControlContext</code> via
     * <code>AccessController.getContext</code>,
     * and then instantiates a new <code>AccessControlContext</code>
     * using the retrieved context along with a new
     * <code>SubjectDomainCombiner</code> (constructed using
     * the provided <code>Subject</code>).
     * Finally, this method invokes <code>AccessController.doPrivileged</code>,
     * passing it the provided <code>PrivilegedExceptionAction</code>,
     * as well as the newly constructed <code>AccessControlContext</code>.
     *
     * <p>
     *
     * @param subject the <code>Subject</code> that the specified
     *                  <code>action</code> will run as.  This parameter
     *                  may be <code>null</code>. <p>
     *
     * @param action the code to be run as the specified
     *                  <code>Subject</code>. <p>
     *
     * @return the value returned by the
     *                  PrivilegedExceptionAction's <code>run</code> method.
     *
     * @exception PrivilegedActionException if the
     *                  <code>PrivilegedExceptionAction.run</code>
     *                  method throws a checked exception. <p>
     *
     * @exception NullPointerException if the specified
     *                  <code>PrivilegedExceptionAction</code> is
     *                  <code>null</code>. <p>
     *
     * @exception SecurityException if the caller does not have permission
     *                  to invoke this method.
     */
    public static <T> T doAs(final Subject subject,
                        final java.security.PrivilegedExceptionAction<T> action)
                        throws java.security.PrivilegedActionException {

        java.lang.SecurityManager sm = System.getSecurityManager();
        if (sm != null) {
404
            sm.checkPermission(AuthPermissionHolder.DO_AS_PERMISSION);
D
duke 已提交
405 406 407 408
        }

        if (action == null)
            throw new NullPointerException
409
                (ResourcesMgr.getString("invalid.null.action.provided"));
D
duke 已提交
410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457

        // set up the new Subject-based AccessControlContext for doPrivileged
        final AccessControlContext currentAcc = AccessController.getContext();

        // call doPrivileged and push this new context on the stack
        return java.security.AccessController.doPrivileged
                                        (action,
                                        createContext(subject, currentAcc));
    }

    /**
     * Perform privileged work as a particular <code>Subject</code>.
     *
     * <p> This method behaves exactly as <code>Subject.doAs</code>,
     * except that instead of retrieving the current Thread's
     * <code>AccessControlContext</code>, it uses the provided
     * <code>AccessControlContext</code>.  If the provided
     * <code>AccessControlContext</code> is <code>null</code>,
     * this method instantiates a new <code>AccessControlContext</code>
     * with an empty collection of ProtectionDomains.
     *
     * <p>
     *
     * @param subject the <code>Subject</code> that the specified
     *                  <code>action</code> will run as.  This parameter
     *                  may be <code>null</code>. <p>
     *
     * @param action the code to be run as the specified
     *                  <code>Subject</code>. <p>
     *
     * @param acc the <code>AccessControlContext</code> to be tied to the
     *                  specified <i>subject</i> and <i>action</i>. <p>
     *
     * @return the value returned by the PrivilegedAction's
     *                  <code>run</code> method.
     *
     * @exception NullPointerException if the <code>PrivilegedAction</code>
     *                  is <code>null</code>. <p>
     *
     * @exception SecurityException if the caller does not have permission
     *                  to invoke this method.
     */
    public static <T> T doAsPrivileged(final Subject subject,
                        final java.security.PrivilegedAction<T> action,
                        final java.security.AccessControlContext acc) {

        java.lang.SecurityManager sm = System.getSecurityManager();
        if (sm != null) {
458
            sm.checkPermission(AuthPermissionHolder.DO_AS_PRIVILEGED_PERMISSION);
D
duke 已提交
459 460 461 462
        }

        if (action == null)
            throw new NullPointerException
463
                (ResourcesMgr.getString("invalid.null.action.provided"));
D
duke 已提交
464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521

        // set up the new Subject-based AccessControlContext
        // for doPrivileged
        final AccessControlContext callerAcc =
                (acc == null ?
                new AccessControlContext(NULL_PD_ARRAY) :
                acc);

        // call doPrivileged and push this new context on the stack
        return java.security.AccessController.doPrivileged
                                        (action,
                                        createContext(subject, callerAcc));
    }

    /**
     * Perform privileged work as a particular <code>Subject</code>.
     *
     * <p> This method behaves exactly as <code>Subject.doAs</code>,
     * except that instead of retrieving the current Thread's
     * <code>AccessControlContext</code>, it uses the provided
     * <code>AccessControlContext</code>.  If the provided
     * <code>AccessControlContext</code> is <code>null</code>,
     * this method instantiates a new <code>AccessControlContext</code>
     * with an empty collection of ProtectionDomains.
     *
     * <p>
     *
     * @param subject the <code>Subject</code> that the specified
     *                  <code>action</code> will run as.  This parameter
     *                  may be <code>null</code>. <p>
     *
     * @param action the code to be run as the specified
     *                  <code>Subject</code>. <p>
     *
     * @param acc the <code>AccessControlContext</code> to be tied to the
     *                  specified <i>subject</i> and <i>action</i>. <p>
     *
     * @return the value returned by the
     *                  PrivilegedExceptionAction's <code>run</code> method.
     *
     * @exception PrivilegedActionException if the
     *                  <code>PrivilegedExceptionAction.run</code>
     *                  method throws a checked exception. <p>
     *
     * @exception NullPointerException if the specified
     *                  <code>PrivilegedExceptionAction</code> is
     *                  <code>null</code>. <p>
     *
     * @exception SecurityException if the caller does not have permission
     *                  to invoke this method.
     */
    public static <T> T doAsPrivileged(final Subject subject,
                        final java.security.PrivilegedExceptionAction<T> action,
                        final java.security.AccessControlContext acc)
                        throws java.security.PrivilegedActionException {

        java.lang.SecurityManager sm = System.getSecurityManager();
        if (sm != null) {
522
            sm.checkPermission(AuthPermissionHolder.DO_AS_PRIVILEGED_PERMISSION);
D
duke 已提交
523 524 525 526
        }

        if (action == null)
            throw new NullPointerException
527
                (ResourcesMgr.getString("invalid.null.action.provided"));
D
duke 已提交
528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605

        // set up the new Subject-based AccessControlContext for doPrivileged
        final AccessControlContext callerAcc =
                (acc == null ?
                new AccessControlContext(NULL_PD_ARRAY) :
                acc);

        // call doPrivileged and push this new context on the stack
        return java.security.AccessController.doPrivileged
                                        (action,
                                        createContext(subject, callerAcc));
    }

    private static AccessControlContext createContext(final Subject subject,
                                        final AccessControlContext acc) {


        return java.security.AccessController.doPrivileged
            (new java.security.PrivilegedAction<AccessControlContext>() {
            public AccessControlContext run() {
                if (subject == null)
                    return new AccessControlContext(acc, null);
                else
                    return new AccessControlContext
                                        (acc,
                                        new SubjectDomainCombiner(subject));
            }
        });
    }

    /**
     * Return the <code>Set</code> of Principals associated with this
     * <code>Subject</code>.  Each <code>Principal</code> represents
     * an identity for this <code>Subject</code>.
     *
     * <p> The returned <code>Set</code> is backed by this Subject's
     * internal <code>Principal</code> <code>Set</code>.  Any modification
     * to the returned <code>Set</code> affects the internal
     * <code>Principal</code> <code>Set</code> as well.
     *
     * <p>
     *
     * @return  The <code>Set</code> of Principals associated with this
     *          <code>Subject</code>.
     */
    public Set<Principal> getPrincipals() {

        // always return an empty Set instead of null
        // so LoginModules can add to the Set if necessary
        return principals;
    }

    /**
     * Return a <code>Set</code> of Principals associated with this
     * <code>Subject</code> that are instances or subclasses of the specified
     * <code>Class</code>.
     *
     * <p> The returned <code>Set</code> is not backed by this Subject's
     * internal <code>Principal</code> <code>Set</code>.  A new
     * <code>Set</code> is created and returned for each method invocation.
     * Modifications to the returned <code>Set</code>
     * will not affect the internal <code>Principal</code> <code>Set</code>.
     *
     * <p>
     *
     * @param c the returned <code>Set</code> of Principals will all be
     *          instances of this class.
     *
     * @return a <code>Set</code> of Principals that are instances of the
     *          specified <code>Class</code>.
     *
     * @exception NullPointerException if the specified <code>Class</code>
     *                  is <code>null</code>.
     */
    public <T extends Principal> Set<T> getPrincipals(Class<T> c) {

        if (c == null)
            throw new NullPointerException
606
                (ResourcesMgr.getString("invalid.null.Class.provided"));
D
duke 已提交
607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699

        // always return an empty Set instead of null
        // so LoginModules can add to the Set if necessary
        return new ClassSet<T>(PRINCIPAL_SET, c);
    }

    /**
     * Return the <code>Set</code> of public credentials held by this
     * <code>Subject</code>.
     *
     * <p> The returned <code>Set</code> is backed by this Subject's
     * internal public Credential <code>Set</code>.  Any modification
     * to the returned <code>Set</code> affects the internal public
     * Credential <code>Set</code> as well.
     *
     * <p>
     *
     * @return  A <code>Set</code> of public credentials held by this
     *          <code>Subject</code>.
     */
    public Set<Object> getPublicCredentials() {

        // always return an empty Set instead of null
        // so LoginModules can add to the Set if necessary
        return pubCredentials;
    }

    /**
     * Return the <code>Set</code> of private credentials held by this
     * <code>Subject</code>.
     *
     * <p> The returned <code>Set</code> is backed by this Subject's
     * internal private Credential <code>Set</code>.  Any modification
     * to the returned <code>Set</code> affects the internal private
     * Credential <code>Set</code> as well.
     *
     * <p> A caller requires permissions to access the Credentials
     * in the returned <code>Set</code>, or to modify the
     * <code>Set</code> itself.  A <code>SecurityException</code>
     * is thrown if the caller does not have the proper permissions.
     *
     * <p> While iterating through the <code>Set</code>,
     * a <code>SecurityException</code> is thrown
     * if the caller does not have permission to access a
     * particular Credential.  The <code>Iterator</code>
     * is nevertheless advanced to next element in the <code>Set</code>.
     *
     * <p>
     *
     * @return  A <code>Set</code> of private credentials held by this
     *          <code>Subject</code>.
     */
    public Set<Object> getPrivateCredentials() {

        // XXX
        // we do not need a security check for
        // AuthPermission(getPrivateCredentials)
        // because we already restrict access to private credentials
        // via the PrivateCredentialPermission.  all the extra AuthPermission
        // would do is protect the set operations themselves
        // (like size()), which don't seem security-sensitive.

        // always return an empty Set instead of null
        // so LoginModules can add to the Set if necessary
        return privCredentials;
    }

    /**
     * Return a <code>Set</code> of public credentials associated with this
     * <code>Subject</code> that are instances or subclasses of the specified
     * <code>Class</code>.
     *
     * <p> The returned <code>Set</code> is not backed by this Subject's
     * internal public Credential <code>Set</code>.  A new
     * <code>Set</code> is created and returned for each method invocation.
     * Modifications to the returned <code>Set</code>
     * will not affect the internal public Credential <code>Set</code>.
     *
     * <p>
     *
     * @param c the returned <code>Set</code> of public credentials will all be
     *          instances of this class.
     *
     * @return a <code>Set</code> of public credentials that are instances
     *          of the  specified <code>Class</code>.
     *
     * @exception NullPointerException if the specified <code>Class</code>
     *          is <code>null</code>.
     */
    public <T> Set<T> getPublicCredentials(Class<T> c) {

        if (c == null)
            throw new NullPointerException
700
                (ResourcesMgr.getString("invalid.null.Class.provided"));
D
duke 已提交
701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744

        // always return an empty Set instead of null
        // so LoginModules can add to the Set if necessary
        return new ClassSet<T>(PUB_CREDENTIAL_SET, c);
    }

    /**
     * Return a <code>Set</code> of private credentials associated with this
     * <code>Subject</code> that are instances or subclasses of the specified
     * <code>Class</code>.
     *
     * <p> The caller must have permission to access all of the
     * requested Credentials, or a <code>SecurityException</code>
     * will be thrown.
     *
     * <p> The returned <code>Set</code> is not backed by this Subject's
     * internal private Credential <code>Set</code>.  A new
     * <code>Set</code> is created and returned for each method invocation.
     * Modifications to the returned <code>Set</code>
     * will not affect the internal private Credential <code>Set</code>.
     *
     * <p>
     *
     * @param c the returned <code>Set</code> of private credentials will all be
     *          instances of this class.
     *
     * @return a <code>Set</code> of private credentials that are instances
     *          of the  specified <code>Class</code>.
     *
     * @exception NullPointerException if the specified <code>Class</code>
     *          is <code>null</code>.
     */
    public <T> Set<T> getPrivateCredentials(Class<T> c) {

        // XXX
        // we do not need a security check for
        // AuthPermission(getPrivateCredentials)
        // because we already restrict access to private credentials
        // via the PrivateCredentialPermission.  all the extra AuthPermission
        // would do is protect the set operations themselves
        // (like size()), which don't seem security-sensitive.

        if (c == null)
            throw new NullPointerException
745
                (ResourcesMgr.getString("invalid.null.Class.provided"));
D
duke 已提交
746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834

        // always return an empty Set instead of null
        // so LoginModules can add to the Set if necessary
        return new ClassSet<T>(PRIV_CREDENTIAL_SET, c);
    }

    /**
     * Compares the specified Object with this <code>Subject</code>
     * for equality.  Returns true if the given object is also a Subject
     * and the two <code>Subject</code> instances are equivalent.
     * More formally, two <code>Subject</code> instances are
     * equal if their <code>Principal</code> and <code>Credential</code>
     * Sets are equal.
     *
     * <p>
     *
     * @param o Object to be compared for equality with this
     *          <code>Subject</code>.
     *
     * @return true if the specified Object is equal to this
     *          <code>Subject</code>.
     *
     * @exception SecurityException if the caller does not have permission
     *          to access the private credentials for this <code>Subject</code>,
     *          or if the caller does not have permission to access the
     *          private credentials for the provided <code>Subject</code>.
     */
    public boolean equals(Object o) {

        if (o == null)
            return false;

        if (this == o)
            return true;

        if (o instanceof Subject) {

            final Subject that = (Subject)o;

            // check the principal and credential sets
            Set<Principal> thatPrincipals;
            synchronized(that.principals) {
                // avoid deadlock from dual locks
                thatPrincipals = new HashSet<Principal>(that.principals);
            }
            if (!principals.equals(thatPrincipals)) {
                return false;
            }

            Set<Object> thatPubCredentials;
            synchronized(that.pubCredentials) {
                // avoid deadlock from dual locks
                thatPubCredentials = new HashSet<Object>(that.pubCredentials);
            }
            if (!pubCredentials.equals(thatPubCredentials)) {
                return false;
            }

            Set<Object> thatPrivCredentials;
            synchronized(that.privCredentials) {
                // avoid deadlock from dual locks
                thatPrivCredentials = new HashSet<Object>(that.privCredentials);
            }
            if (!privCredentials.equals(thatPrivCredentials)) {
                return false;
            }
            return true;
        }
        return false;
    }

    /**
     * Return the String representation of this <code>Subject</code>.
     *
     * <p>
     *
     * @return the String representation of this <code>Subject</code>.
     */
    public String toString() {
        return toString(true);
    }

    /**
     * package private convenience method to print out the Subject
     * without firing off a security check when trying to access
     * the Private Credentials
     */
    String toString(boolean includePrivateCredentials) {

835
        String s = ResourcesMgr.getString("Subject.");
D
duke 已提交
836 837 838 839 840 841
        String suffix = "";

        synchronized(principals) {
            Iterator<Principal> pI = principals.iterator();
            while (pI.hasNext()) {
                Principal p = pI.next();
842 843
                suffix = suffix + ResourcesMgr.getString(".Principal.") +
                        p.toString() + ResourcesMgr.getString("NEWLINE");
D
duke 已提交
844 845 846 847 848 849 850 851
            }
        }

        synchronized(pubCredentials) {
            Iterator<Object> pI = pubCredentials.iterator();
            while (pI.hasNext()) {
                Object o = pI.next();
                suffix = suffix +
852 853
                        ResourcesMgr.getString(".Public.Credential.") +
                        o.toString() + ResourcesMgr.getString("NEWLINE");
D
duke 已提交
854 855 856 857 858 859 860 861 862 863
            }
        }

        if (includePrivateCredentials) {
            synchronized(privCredentials) {
                Iterator<Object> pI = privCredentials.iterator();
                while (pI.hasNext()) {
                    try {
                        Object o = pI.next();
                        suffix += ResourcesMgr.getString
864
                                        (".Private.Credential.") +
D
duke 已提交
865
                                        o.toString() +
866
                                        ResourcesMgr.getString("NEWLINE");
D
duke 已提交
867 868
                    } catch (SecurityException se) {
                        suffix += ResourcesMgr.getString
869
                                (".Private.Credential.inaccessible.");
D
duke 已提交
870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038
                        break;
                    }
                }
            }
        }
        return s + suffix;
    }

    /**
     * Returns a hashcode for this <code>Subject</code>.
     *
     * <p>
     *
     * @return a hashcode for this <code>Subject</code>.
     *
     * @exception SecurityException if the caller does not have permission
     *          to access this Subject's private credentials.
     */
    public int hashCode() {

        /**
         * The hashcode is derived exclusive or-ing the
         * hashcodes of this Subject's Principals and credentials.
         *
         * If a particular credential was destroyed
         * (<code>credential.hashCode()</code> throws an
         * <code>IllegalStateException</code>),
         * the hashcode for that credential is derived via:
         * <code>credential.getClass().toString().hashCode()</code>.
         */

        int hashCode = 0;

        synchronized(principals) {
            Iterator<Principal> pIterator = principals.iterator();
            while (pIterator.hasNext()) {
                Principal p = pIterator.next();
                hashCode ^= p.hashCode();
            }
        }

        synchronized(pubCredentials) {
            Iterator<Object> pubCIterator = pubCredentials.iterator();
            while (pubCIterator.hasNext()) {
                hashCode ^= getCredHashCode(pubCIterator.next());
            }
        }
        return hashCode;
    }

    /**
     * get a credential's hashcode
     */
    private int getCredHashCode(Object o) {
        try {
            return o.hashCode();
        } catch (IllegalStateException ise) {
            return o.getClass().toString().hashCode();
        }
    }

    /**
     * Writes this object out to a stream (i.e., serializes it).
     */
    private void writeObject(java.io.ObjectOutputStream oos)
                throws java.io.IOException {
        synchronized(principals) {
            oos.defaultWriteObject();
        }
    }

    /**
     * Reads this object from a stream (i.e., deserializes it)
     */
    private void readObject(java.io.ObjectInputStream s)
                throws java.io.IOException, ClassNotFoundException {

        s.defaultReadObject();

        // The Credential <code>Set</code> is not serialized, but we do not
        // want the default deserialization routine to set it to null.
        this.pubCredentials = Collections.synchronizedSet
                        (new SecureSet<Object>(this, PUB_CREDENTIAL_SET));
        this.privCredentials = Collections.synchronizedSet
                        (new SecureSet<Object>(this, PRIV_CREDENTIAL_SET));
    }

    /**
     * Prevent modifications unless caller has permission.
     *
     * @serial include
     */
    private static class SecureSet<E>
        extends AbstractSet<E>
        implements java.io.Serializable {

        private static final long serialVersionUID = 7911754171111800359L;

        /**
         * @serialField this$0 Subject The outer Subject instance.
         * @serialField elements LinkedList The elements in this set.
         */
        private static final ObjectStreamField[] serialPersistentFields = {
            new ObjectStreamField("this$0", Subject.class),
            new ObjectStreamField("elements", LinkedList.class),
            new ObjectStreamField("which", int.class)
        };

        Subject subject;
        LinkedList<E> elements;

        /**
         * @serial An integer identifying the type of objects contained
         *      in this set.  If <code>which == 1</code>,
         *      this is a Principal set and all the elements are
         *      of type <code>java.security.Principal</code>.
         *      If <code>which == 2</code>, this is a public credential
         *      set and all the elements are of type <code>Object</code>.
         *      If <code>which == 3</code>, this is a private credential
         *      set and all the elements are of type <code>Object</code>.
         */
        private int which;

        SecureSet(Subject subject, int which) {
            this.subject = subject;
            this.which = which;
            this.elements = new LinkedList<E>();
        }

        SecureSet(Subject subject, int which, Set<? extends E> set) {
            this.subject = subject;
            this.which = which;
            this.elements = new LinkedList<E>(set);
        }

        public int size() {
            return elements.size();
        }

        public Iterator<E> iterator() {
            final LinkedList<E> list = elements;
            return new Iterator<E>() {
                ListIterator<E> i = list.listIterator(0);

                public boolean hasNext() {return i.hasNext();}

                public E next() {
                    if (which != Subject.PRIV_CREDENTIAL_SET) {
                        return i.next();
                    }

                    SecurityManager sm = System.getSecurityManager();
                    if (sm != null) {
                        try {
                            sm.checkPermission(new PrivateCredentialPermission
                                (list.get(i.nextIndex()).getClass().getName(),
                                subject.getPrincipals()));
                        } catch (SecurityException se) {
                            i.next();
                            throw (se);
                        }
                    }
                    return i.next();
                }

                public void remove() {

                    if (subject.isReadOnly()) {
                        throw new IllegalStateException(ResourcesMgr.getString
1039
                                ("Subject.is.read.only"));
D
duke 已提交
1040 1041 1042 1043 1044 1045
                    }

                    java.lang.SecurityManager sm = System.getSecurityManager();
                    if (sm != null) {
                        switch (which) {
                        case Subject.PRINCIPAL_SET:
1046
                            sm.checkPermission(AuthPermissionHolder.MODIFY_PRINCIPALS_PERMISSION);
D
duke 已提交
1047 1048
                            break;
                        case Subject.PUB_CREDENTIAL_SET:
1049
                            sm.checkPermission(AuthPermissionHolder.MODIFY_PUBLIC_CREDENTIALS_PERMISSION);
D
duke 已提交
1050 1051
                            break;
                        default:
1052
                            sm.checkPermission(AuthPermissionHolder.MODIFY_PRIVATE_CREDENTIALS_PERMISSION);
D
duke 已提交
1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064
                            break;
                        }
                    }
                    i.remove();
                }
            };
        }

        public boolean add(E o) {

            if (subject.isReadOnly()) {
                throw new IllegalStateException
1065
                        (ResourcesMgr.getString("Subject.is.read.only"));
D
duke 已提交
1066 1067 1068 1069 1070 1071
            }

            java.lang.SecurityManager sm = System.getSecurityManager();
            if (sm != null) {
                switch (which) {
                case Subject.PRINCIPAL_SET:
1072
                    sm.checkPermission(AuthPermissionHolder.MODIFY_PRINCIPALS_PERMISSION);
D
duke 已提交
1073 1074
                    break;
                case Subject.PUB_CREDENTIAL_SET:
1075
                    sm.checkPermission(AuthPermissionHolder.MODIFY_PUBLIC_CREDENTIALS_PERMISSION);
D
duke 已提交
1076 1077
                    break;
                default:
1078
                    sm.checkPermission(AuthPermissionHolder.MODIFY_PRIVATE_CREDENTIALS_PERMISSION);
D
duke 已提交
1079 1080 1081 1082 1083 1084 1085 1086
                    break;
                }
            }

            switch (which) {
            case Subject.PRINCIPAL_SET:
                if (!(o instanceof Principal)) {
                    throw new SecurityException(ResourcesMgr.getString
1087
                        ("attempting.to.add.an.object.which.is.not.an.instance.of.java.security.Principal.to.a.Subject.s.Principal.Set"));
D
duke 已提交
1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389
                }
                break;
            default:
                // ok to add Objects of any kind to credential sets
                break;
            }

            // check for duplicates
            if (!elements.contains(o))
                return elements.add(o);
            else
                return false;
        }

        public boolean remove(Object o) {

            final Iterator<E> e = iterator();
            while (e.hasNext()) {
                E next;
                if (which != Subject.PRIV_CREDENTIAL_SET) {
                    next = e.next();
                } else {
                    next = java.security.AccessController.doPrivileged
                        (new java.security.PrivilegedAction<E>() {
                        public E run() {
                            return e.next();
                        }
                    });
                }

                if (next == null) {
                    if (o == null) {
                        e.remove();
                        return true;
                    }
                } else if (next.equals(o)) {
                    e.remove();
                    return true;
                }
            }
            return false;
        }

        public boolean contains(Object o) {
            final Iterator<E> e = iterator();
            while (e.hasNext()) {
                E next;
                if (which != Subject.PRIV_CREDENTIAL_SET) {
                    next = e.next();
                } else {

                    // For private credentials:
                    // If the caller does not have read permission for
                    // for o.getClass(), we throw a SecurityException.
                    // Otherwise we check the private cred set to see whether
                    // it contains the Object

                    SecurityManager sm = System.getSecurityManager();
                    if (sm != null) {
                        sm.checkPermission(new PrivateCredentialPermission
                                                (o.getClass().getName(),
                                                subject.getPrincipals()));
                    }
                    next = java.security.AccessController.doPrivileged
                        (new java.security.PrivilegedAction<E>() {
                        public E run() {
                            return e.next();
                        }
                    });
                }

                if (next == null) {
                    if (o == null) {
                        return true;
                    }
                } else if (next.equals(o)) {
                    return true;
                }
            }
            return false;
        }

        public boolean removeAll(Collection<?> c) {

            boolean modified = false;
            final Iterator<E> e = iterator();
            while (e.hasNext()) {
                E next;
                if (which != Subject.PRIV_CREDENTIAL_SET) {
                    next = e.next();
                } else {
                    next = java.security.AccessController.doPrivileged
                        (new java.security.PrivilegedAction<E>() {
                        public E run() {
                            return e.next();
                        }
                    });
                }

                Iterator<?> ce = c.iterator();
                while (ce.hasNext()) {
                    Object o = ce.next();
                    if (next == null) {
                        if (o == null) {
                            e.remove();
                            modified = true;
                            break;
                        }
                    } else if (next.equals(o)) {
                        e.remove();
                        modified = true;
                        break;
                    }
                }
            }
            return modified;
        }

        public boolean retainAll(Collection<?> c) {

            boolean modified = false;
            boolean retain = false;
            final Iterator<E> e = iterator();
            while (e.hasNext()) {
                retain = false;
                E next;
                if (which != Subject.PRIV_CREDENTIAL_SET) {
                    next = e.next();
                } else {
                    next = java.security.AccessController.doPrivileged
                        (new java.security.PrivilegedAction<E>() {
                        public E run() {
                            return e.next();
                        }
                    });
                }

                Iterator<?> ce = c.iterator();
                while (ce.hasNext()) {
                    Object o = ce.next();
                    if (next == null) {
                        if (o == null) {
                            retain = true;
                            break;
                        }
                    } else if (next.equals(o)) {
                        retain = true;
                        break;
                    }
                }

                if (!retain) {
                    e.remove();
                    retain = false;
                    modified = true;
                }
            }
            return modified;
        }

        public void clear() {
            final Iterator<E> e = iterator();
            while (e.hasNext()) {
                E next;
                if (which != Subject.PRIV_CREDENTIAL_SET) {
                    next = e.next();
                } else {
                    next = java.security.AccessController.doPrivileged
                        (new java.security.PrivilegedAction<E>() {
                        public E run() {
                            return e.next();
                        }
                    });
                }
                e.remove();
            }
        }

        /**
         * Writes this object out to a stream (i.e., serializes it).
         *
         * <p>
         *
         * @serialData If this is a private credential set,
         *      a security check is performed to ensure that
         *      the caller has permission to access each credential
         *      in the set.  If the security check passes,
         *      the set is serialized.
         */
        private void writeObject(java.io.ObjectOutputStream oos)
                throws java.io.IOException {

            if (which == Subject.PRIV_CREDENTIAL_SET) {
                // check permissions before serializing
                Iterator<E> i = iterator();
                while (i.hasNext()) {
                    i.next();
                }
            }
            ObjectOutputStream.PutField fields = oos.putFields();
            fields.put("this$0", subject);
            fields.put("elements", elements);
            fields.put("which", which);
            oos.writeFields();
        }

        private void readObject(ObjectInputStream ois)
            throws IOException, ClassNotFoundException
        {
            ObjectInputStream.GetField fields = ois.readFields();
            subject = (Subject) fields.get("this$0", null);
            elements = (LinkedList<E>) fields.get("elements", null);
            which = fields.get("which", 0);
        }
    }

    /**
     * This class implements a <code>Set</code> which returns only
     * members that are an instance of a specified Class.
     */
    private class ClassSet<T> extends AbstractSet<T> {

        private int which;
        private Class<T> c;
        private Set<T> set;

        ClassSet(int which, Class<T> c) {
            this.which = which;
            this.c = c;
            set = new HashSet<T>();

            switch (which) {
            case Subject.PRINCIPAL_SET:
                synchronized(principals) { populateSet(); }
                break;
            case Subject.PUB_CREDENTIAL_SET:
                synchronized(pubCredentials) { populateSet(); }
                break;
            default:
                synchronized(privCredentials) { populateSet(); }
                break;
            }
        }

        private void populateSet() {
            final Iterator<?> iterator;
            switch(which) {
            case Subject.PRINCIPAL_SET:
                iterator = Subject.this.principals.iterator();
                break;
            case Subject.PUB_CREDENTIAL_SET:
                iterator = Subject.this.pubCredentials.iterator();
                break;
            default:
                iterator = Subject.this.privCredentials.iterator();
                break;
            }

            // Check whether the caller has permisson to get
            // credentials of Class c

            while (iterator.hasNext()) {
                Object next;
                if (which == Subject.PRIV_CREDENTIAL_SET) {
                    next = java.security.AccessController.doPrivileged
                        (new java.security.PrivilegedAction<Object>() {
                        public Object run() {
                            return iterator.next();
                        }
                    });
                } else {
                    next = iterator.next();
                }
                if (c.isAssignableFrom(next.getClass())) {
                    if (which != Subject.PRIV_CREDENTIAL_SET) {
                        set.add((T)next);
                    } else {
                        // Check permission for private creds
                        SecurityManager sm = System.getSecurityManager();
                        if (sm != null) {
                            sm.checkPermission(new PrivateCredentialPermission
                                                (next.getClass().getName(),
                                                Subject.this.getPrincipals()));
                        }
                        set.add((T)next);
                    }
                }
            }
        }

        public int size() {
            return set.size();
        }

        public Iterator<T> iterator() {
            return set.iterator();
        }

        public boolean add(T o) {

            if (!o.getClass().isAssignableFrom(c)) {
                MessageFormat form = new MessageFormat(ResourcesMgr.getString
1390
                        ("attempting.to.add.an.object.which.is.not.an.instance.of.class"));
D
duke 已提交
1391 1392 1393 1394 1395 1396 1397
                Object[] source = {c.toString()};
                throw new SecurityException(form.format(source));
            }

            return set.add(o);
        }
    }
1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420

    static class AuthPermissionHolder {
        static final AuthPermission DO_AS_PERMISSION =
            new AuthPermission("doAs");

        static final AuthPermission DO_AS_PRIVILEGED_PERMISSION =
            new AuthPermission("doAsPrivileged");

        static final AuthPermission SET_READ_ONLY_PERMISSION =
            new AuthPermission("setReadOnly");

        static final AuthPermission GET_SUBJECT_PERMISSION =
            new AuthPermission("getSubject");

        static final AuthPermission MODIFY_PRINCIPALS_PERMISSION =
            new AuthPermission("modifyPrincipals");

        static final AuthPermission MODIFY_PUBLIC_CREDENTIALS_PERMISSION =
            new AuthPermission("modifyPublicCredentials");

        static final AuthPermission MODIFY_PRIVATE_CREDENTIALS_PERMISSION =
            new AuthPermission("modifyPrivateCredentials");
    }
D
duke 已提交
1421
}