JDK8/Java8源码在线阅读
/*
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* 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
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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.
*
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package javax.security.auth;
import java.security.AccessController;
import java.security.Permission;
import java.security.Permissions;
import java.security.PermissionCollection;
import java.security.Policy;
import java.security.Principal;
import java.security.PrivilegedAction;
import java.security.ProtectionDomain;
import java.security.Security;
import java.util.Set;
import java.util.WeakHashMap;
import java.lang.ref.WeakReference;
/**
* A {@code SubjectDomainCombiner} updates ProtectionDomains
* with Principals from the {@code Subject} associated with this
* {@code SubjectDomainCombiner}.
*
*/
public class SubjectDomainCombiner implements java.security.DomainCombiner {
private Subject subject;
private WeakKeyValueMap<ProtectionDomain, ProtectionDomain> cachedPDs =
new WeakKeyValueMap<>();
private Set<Principal> principalSet;
private Principal[] principals;
private static final sun.security.util.Debug debug =
sun.security.util.Debug.getInstance("combiner",
"\t[SubjectDomainCombiner]");
@SuppressWarnings("deprecation")
// Note: check only at classloading time, not dynamically during combine()
private static final boolean useJavaxPolicy =
javax.security.auth.Policy.isCustomPolicySet(debug);
// Relevant only when useJavaxPolicy is true
private static final boolean allowCaching =
(useJavaxPolicy && cachePolicy());
/**
* Associate the provided {@code Subject} with this
* {@code SubjectDomainCombiner}.
*
* <p>
*
* @param subject the {@code Subject} to be associated with
* with this {@code SubjectDomainCombiner}.
*/
public SubjectDomainCombiner(Subject subject) {
this.subject = subject;
if (subject.isReadOnly()) {
principalSet = subject.getPrincipals();
principals = principalSet.toArray
(new Principal[principalSet.size()]);
}
}
/**
* Get the {@code Subject} associated with this
* {@code SubjectDomainCombiner}.
*
* <p>
*
* @return the {@code Subject} associated with this
* {@code SubjectDomainCombiner}, or {@code null}
* if no {@code Subject} is associated with this
* {@code SubjectDomainCombiner}.
*
* @exception SecurityException if the caller does not have permission
* to get the {@code Subject} associated with this
* {@code SubjectDomainCombiner}.
*/
public Subject getSubject() {
java.lang.SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(new AuthPermission
("getSubjectFromDomainCombiner"));
}
return subject;
}
/**
* Update the relevant ProtectionDomains with the Principals
* from the {@code Subject} associated with this
* {@code SubjectDomainCombiner}.
*
* <p> A new {@code ProtectionDomain} instance is created
* for each {@code ProtectionDomain} in the
* <i>currentDomains</i> array. Each new {@code ProtectionDomain}
* instance is created using the {@code CodeSource},
* {@code Permission}s and {@code ClassLoader}
* from the corresponding {@code ProtectionDomain} in
* <i>currentDomains</i>, as well as with the Principals from
* the {@code Subject} associated with this
* {@code SubjectDomainCombiner}.
*
* <p> All of the newly instantiated ProtectionDomains are
* combined into a new array. The ProtectionDomains from the
* <i>assignedDomains</i> array are appended to this new array,
* and the result is returned.
*
* <p> Note that optimizations such as the removal of duplicate
* ProtectionDomains may have occurred.
* In addition, caching of ProtectionDomains may be permitted.
*
* <p>
*
* @param currentDomains the ProtectionDomains associated with the
* current execution Thread, up to the most recent
* privileged {@code ProtectionDomain}.
* The ProtectionDomains are are listed in order of execution,
* with the most recently executing {@code ProtectionDomain}
* residing at the beginning of the array. This parameter may
* be {@code null} if the current execution Thread
* has no associated ProtectionDomains.<p>
*
* @param assignedDomains the ProtectionDomains inherited from the
* parent Thread, or the ProtectionDomains from the
* privileged <i>context</i>, if a call to
* AccessController.doPrivileged(..., <i>context</i>)
* had occurred This parameter may be {@code null}
* if there were no ProtectionDomains inherited from the
* parent Thread, or from the privileged <i>context</i>.
*
* @return a new array consisting of the updated ProtectionDomains,
* or {@code null}.
*/
public ProtectionDomain[] combine(ProtectionDomain[] currentDomains,
ProtectionDomain[] assignedDomains) {
if (debug != null) {
if (subject == null) {
debug.println("null subject");
} else {
final Subject s = subject;
AccessController.doPrivileged
(new java.security.PrivilegedAction<Void>() {
public Void run() {
debug.println(s.toString());
return null;
}
});
}
printInputDomains(currentDomains, assignedDomains);
}
if (currentDomains == null || currentDomains.length == 0) {
// No need to optimize assignedDomains because it should
// have been previously optimized (when it was set).
// Note that we are returning a direct reference
// to the input array - since ACC does not clone
// the arrays when it calls combiner.combine,
// multiple ACC instances may share the same
// array instance in this case
return assignedDomains;
}
// optimize currentDomains
//
// No need to optimize assignedDomains because it should
// have been previously optimized (when it was set).
currentDomains = optimize(currentDomains);
if (debug != null) {
debug.println("after optimize");
printInputDomains(currentDomains, assignedDomains);
}
if (currentDomains == null && assignedDomains == null) {
return null;
}
// maintain backwards compatibility for developers who provide
// their own custom javax.security.auth.Policy implementations
if (useJavaxPolicy) {
return combineJavaxPolicy(currentDomains, assignedDomains);
}
int cLen = (currentDomains == null ? 0 : currentDomains.length);
int aLen = (assignedDomains == null ? 0 : assignedDomains.length);
// the ProtectionDomains for the new AccessControlContext
// that we will return
ProtectionDomain[] newDomains = new ProtectionDomain[cLen + aLen];
boolean allNew = true;
synchronized(cachedPDs) {
if (!subject.isReadOnly() &&
!subject.getPrincipals().equals(principalSet)) {
// if the Subject was mutated, clear the PD cache
Set<Principal> newSet = subject.getPrincipals();
synchronized(newSet) {
principalSet = new java.util.HashSet<Principal>(newSet);
}
principals = principalSet.toArray
(new Principal[principalSet.size()]);
cachedPDs.clear();
if (debug != null) {
debug.println("Subject mutated - clearing cache");
}
}
ProtectionDomain subjectPd;
for (int i = 0; i < cLen; i++) {
ProtectionDomain pd = currentDomains[i];
subjectPd = cachedPDs.getValue(pd);
if (subjectPd == null) {
subjectPd = new ProtectionDomain(pd.getCodeSource(),
pd.getPermissions(),
pd.getClassLoader(),
principals);
cachedPDs.putValue(pd, subjectPd);
} else {
allNew = false;
}
newDomains[i] = subjectPd;
}
}
if (debug != null) {
debug.println("updated current: ");
for (int i = 0; i < cLen; i++) {
debug.println("\tupdated[" + i + "] = " +
printDomain(newDomains[i]));
}
}
// now add on the assigned domains
if (aLen > 0) {
System.arraycopy(assignedDomains, 0, newDomains, cLen, aLen);
// optimize the result (cached PDs might exist in assignedDomains)
if (!allNew) {
newDomains = optimize(newDomains);
}
}
// if aLen == 0 || allNew, no need to further optimize newDomains
if (debug != null) {
if (newDomains == null || newDomains.length == 0) {
debug.println("returning null");
} else {
debug.println("combinedDomains: ");
for (int i = 0; i < newDomains.length; i++) {
debug.println("newDomain " + i + ": " +
printDomain(newDomains[i]));
}
}
}
// return the new ProtectionDomains
if (newDomains == null || newDomains.length == 0) {
return null;
} else {
return newDomains;
}
}
/**
* Use the javax.security.auth.Policy implementation
*/
private ProtectionDomain[] combineJavaxPolicy(
ProtectionDomain[] currentDomains,
ProtectionDomain[] assignedDomains) {
if (!allowCaching) {
java.security.AccessController.doPrivileged
(new PrivilegedAction<Void>() {
@SuppressWarnings("deprecation")
public Void run() {
// Call refresh only caching is disallowed
javax.security.auth.Policy.getPolicy().refresh();
return null;
}
});
}
int cLen = (currentDomains == null ? 0 : currentDomains.length);
int aLen = (assignedDomains == null ? 0 : assignedDomains.length);
// the ProtectionDomains for the new AccessControlContext
// that we will return
ProtectionDomain[] newDomains = new ProtectionDomain[cLen + aLen];
synchronized(cachedPDs) {
if (!subject.isReadOnly() &&
!subject.getPrincipals().equals(principalSet)) {
// if the Subject was mutated, clear the PD cache
Set<Principal> newSet = subject.getPrincipals();
synchronized(newSet) {
principalSet = new java.util.HashSet<Principal>(newSet);
}
principals = principalSet.toArray
(new Principal[principalSet.size()]);
cachedPDs.clear();
if (debug != null) {
debug.println("Subject mutated - clearing cache");
}
}
for (int i = 0; i < cLen; i++) {
ProtectionDomain pd = currentDomains[i];
ProtectionDomain subjectPd = cachedPDs.getValue(pd);
if (subjectPd == null) {
// XXX
// we must first add the original permissions.
// that way when we later add the new JAAS permissions,
// any unresolved JAAS-related permissions will
// automatically get resolved.
// get the original perms
Permissions perms = new Permissions();
PermissionCollection coll = pd.getPermissions();
java.util.Enumeration<Permission> e;
if (coll != null) {
synchronized (coll) {
e = coll.elements();
while (e.hasMoreElements()) {
Permission newPerm =
e.nextElement();
perms.add(newPerm);
}
}
}
// get perms from the policy
final java.security.CodeSource finalCs = pd.getCodeSource();
final Subject finalS = subject;
PermissionCollection newPerms =
java.security.AccessController.doPrivileged
(new PrivilegedAction<PermissionCollection>() {
@SuppressWarnings("deprecation")
public PermissionCollection run() {
return
javax.security.auth.Policy.getPolicy().getPermissions
(finalS, finalCs);
}
});
// add the newly granted perms,
// avoiding duplicates
synchronized (newPerms) {
e = newPerms.elements();
while (e.hasMoreElements()) {
Permission newPerm = e.nextElement();
if (!perms.implies(newPerm)) {
perms.add(newPerm);
if (debug != null)
debug.println (
"Adding perm " + newPerm + "\n");
}
}
}
subjectPd = new ProtectionDomain
(finalCs, perms, pd.getClassLoader(), principals);
if (allowCaching)
cachedPDs.putValue(pd, subjectPd);
}
newDomains[i] = subjectPd;
}
}
if (debug != null) {
debug.println("updated current: ");
for (int i = 0; i < cLen; i++) {
debug.println("\tupdated[" + i + "] = " + newDomains[i]);
}
}
// now add on the assigned domains
if (aLen > 0) {
System.arraycopy(assignedDomains, 0, newDomains, cLen, aLen);
}
if (debug != null) {
if (newDomains == null || newDomains.length == 0) {
debug.println("returning null");
} else {
debug.println("combinedDomains: ");
for (int i = 0; i < newDomains.length; i++) {
debug.println("newDomain " + i + ": " +
newDomains[i].toString());
}
}
}
// return the new ProtectionDomains
if (newDomains == null || newDomains.length == 0) {
return null;
} else {
return newDomains;
}
}
private static ProtectionDomain[] optimize(ProtectionDomain[] domains) {
if (domains == null || domains.length == 0)
return null;
ProtectionDomain[] optimized = new ProtectionDomain[domains.length];
ProtectionDomain pd;
int num = 0;
for (int i = 0; i < domains.length; i++) {
// skip domains with AllPermission
// XXX
//
// if (domains[i].implies(ALL_PERMISSION))
// continue;
// skip System Domains
if ((pd = domains[i]) != null) {
// remove duplicates
boolean found = false;
for (int j = 0; j < num && !found; j++) {
found = (optimized[j] == pd);
}
if (!found) {
optimized[num++] = pd;
}
}
}
// resize the array if necessary
if (num > 0 && num < domains.length) {
ProtectionDomain[] downSize = new ProtectionDomain[num];
System.arraycopy(optimized, 0, downSize, 0, downSize.length);
optimized = downSize;
}
return ((num == 0 || optimized.length == 0) ? null : optimized);
}
private static boolean cachePolicy() {
String s = AccessController.doPrivileged
(new PrivilegedAction<String>() {
public String run() {
return Security.getProperty("cache.auth.policy");
}
});
if (s != null) {
return Boolean.parseBoolean(s);
}
// cache by default
return true;
}
private static void printInputDomains(ProtectionDomain[] currentDomains,
ProtectionDomain[] assignedDomains) {
if (currentDomains == null || currentDomains.length == 0) {
debug.println("currentDomains null or 0 length");
} else {
for (int i = 0; currentDomains != null &&
i < currentDomains.length; i++) {
if (currentDomains[i] == null) {
debug.println("currentDomain " + i + ": SystemDomain");
} else {
debug.println("currentDomain " + i + ": " +
printDomain(currentDomains[i]));
}
}
}
if (assignedDomains == null || assignedDomains.length == 0) {
debug.println("assignedDomains null or 0 length");
} else {
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