/*
* @(#)SubjectDomainCombiner.java 1.50 07/01/26
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package javax.security.auth;
import java.security.AccessController;
import java.security.AccessControlContext;
import java.security.AllPermission;
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.lang.ClassLoader;
import java.security.Security;
import java.util.Set;
import java.util.Iterator;
import java.util.WeakHashMap;
import java.lang.ref.WeakReference;
/**
* A <code>SubjectDomainCombiner</code> updates ProtectionDomains
* with Principals from the <code>Subject</code> associated with this
* <code>SubjectDomainCombiner</code>.
*
* @version 1.50, 01/26/07
*/
public class SubjectDomainCombiner implements java.security.DomainCombiner {
private Subject subject;
private WeakKeyValueMap<ProtectionDomain, ProtectionDomain> cachedPDs =
new WeakKeyValueMap<ProtectionDomain, ProtectionDomain>();
private Set principalSet;
private Principal[] principals;
private static final sun.security.util.Debug debug =
sun.security.util.Debug.getInstance("combiner",
"\t[SubjectDomainCombiner]");
// Note: check only at classloading time, not dynamically during combine()
private static final boolean useJavaxPolicy = compatPolicy();
// Relevant only when useJavaxPolicy is true
private static final boolean allowCaching =
(useJavaxPolicy && cachePolicy());
/**
* Associate the provided <code>Subject</code> with this
* <code>SubjectDomainCombiner</code>.
*
* <p>
*
* @param subject the <code>Subject</code> to be associated with
* with this <code>SubjectDomainCombiner</code>.
*/
public SubjectDomainCombiner(Subject subject) {
this.subject = subject;
if (subject.isReadOnly()) {
principalSet = subject.getPrincipals();
principals = (Principal[])principalSet.toArray
(new Principal[principalSet.size()]);
}
}
/**
* Get the <code>Subject</code> associated with this
* <code>SubjectDomainCombiner</code>.
*
* <p>
*
* @return the <code>Subject</code> associated with this
* <code>SubjectDomainCombiner</code>, or <code>null</code>
* if no <code>Subject</code> is associated with this
* <code>SubjectDomainCombiner</code>.
*
* @exception SecurityException if the caller does not have permission
* to get the <code>Subject</code> associated with this
* <code>SubjectDomainCombiner</code>.
*/
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</code> associated with this
* <code>SubjectDomainCombiner</code>.
*
* <p> A new <code>ProtectionDomain</code> instance is created
* for each <code>ProtectionDomain</code> in the
* <i>currentDomains</i> array. Each new <code>ProtectionDomain</code>
* instance is created using the <code>CodeSource</code>,
* <code>Permission</code>s and <code>ClassLoader</code>
* from the corresponding <code>ProtectionDomain</code> in
* <i>currentDomains</i>, as well as with the Principals from
* the <code>Subject</code> associated with this
* <code>SubjectDomainCombiner</code>.
*
* <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</code>.
* The ProtectionDomains are are listed in order of execution,
* with the most recently executing <code>ProtectionDomain</code>
* residing at the beginning of the array. This parameter may
* be <code>null</code> 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</code>
* 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</code>.
*/
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() {
public Object 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 people who provide
// their own 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 newSet = subject.getPrincipals();
synchronized(newSet) {
principalSet = new java.util.HashSet(newSet);
}
principals = (Principal[])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() {
public Object 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 newSet = subject.getPrincipals();
synchronized(newSet) {
principalSet = new java.util.HashSet(newSet);
}
principals = (Principal[])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 e;
if (coll != null) {
synchronized (coll) {
e = coll.elements();
while (e.hasMoreElements()) {
Permission newPerm =
(Permission)e.nextElement();
perms.add(newPerm);
}
}
}
// get perms from the policy
final java.security.CodeSource finalCs = pd.getCodeSource();
final Subject finalS = subject;
PermissionCollection newPerms = (PermissionCollection)
java.security.AccessController.doPrivileged
(new PrivilegedAction() {
public Object 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 = (Permission)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 = (String)AccessController.doPrivileged
(new PrivilegedAction() {
public Object run() {
return java.security.Security.getProperty
("cache.auth.policy");
}
});
if (s != null) {
return Boolean.parseBoolean(s);
}
// cache by default
return true;
}
// maintain backwards compatibility for people who provide
// their own javax.security.auth.Policy implementations
private static boolean compatPolicy() {
javax.security.auth.Policy javaxPolicy =
(javax.security.auth.Policy)AccessController.doPrivileged
(new PrivilegedAction() {
public Object run() {
return javax.security.auth.Policy.getPolicy();
}
});
if (!(javaxPolicy instanceof com.sun.security.auth.PolicyFile)) {
if (debug != null) {
debug.println("Providing backwards compatibility for " +
"javax.security.auth.policy implementation: " +
javaxPolicy.toString());
}
return true;
} else {
return false;
}
}
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 {
debug.println("assignedDomains = ");
for (int i = 0; assignedDomains != null &&
i < assignedDomains.length; i++) {
if (assignedDomains[i] == null) {
debug.println("assignedDomain " + i + ": SystemDomain");
} else {
debug.println("assignedDomain " + i + ": " +
printDomain(assignedDomains[i]));
}
}
}
}
private static String printDomain(final ProtectionDomain pd) {
if (pd == null) {
return "null";
}
return (String)AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
return pd.toString();
}
});
}
/**
* A HashMap that has weak keys and values.
*
* Key objects in this map are the "current" ProtectionDomain instances
* received via the combine method. Each "current" PD is mapped to a
* new PD instance that holds both the contents of the "current" PD,
* as well as the principals from the Subject associated with this combiner.
*
* The newly created "principal-based" PD values must be stored as
* WeakReferences since they contain strong references to the
* corresponding key object (the "current" non-principal-based PD),
* which will prevent the key from being GC'd. Specifically,
* a "principal-based" PD contains strong references to the CodeSource,
* signer certs, PermissionCollection and ClassLoader objects
* in the "current PD".
*/
private static class WeakKeyValueMap<K,V> extends
WeakHashMap<K,WeakReference<V>> {
public V getValue(K key) {
WeakReference<V> wr = super.get(key);
if (wr != null) {
return wr.get();
}
return null;
}
public V putValue(K key, V value) {
WeakReference<V> wr = super.put(key, new WeakReference<V>(value));
if (wr != null) {
return wr.get();
}
return null;
}
}
}
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