/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* 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.
*
* 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.
*/
/**
* An AccessControlContext is used to make system resource access decisions
* based on the context it encapsulates.
*
* <p>More specifically, it encapsulates a context and
* has a single method, <code>checkPermission</code>,
* that is equivalent to the <code>checkPermission</code> method
* in the AccessController class, with one difference: The AccessControlContext
* <code>checkPermission</code> method makes access decisions based on the
* context it encapsulates,
* rather than that of the current execution thread.
*
* <p>Thus, the purpose of AccessControlContext is for those situations where
* a security check that should be made within a given context
* actually needs to be done from within a
* <i>different</i> context (for example, from within a worker thread).
*
* <p> An AccessControlContext is created by calling the
* <code>AccessController.getContext</code> method.
* The <code>getContext</code> method takes a "snapshot"
* of the current calling context, and places
* it in an AccessControlContext object, which it returns. A sample call is
* the following:
*
* <pre>
* AccessControlContext acc = AccessController.getContext()
* </pre>
*
* <p>
* Code within a different context can subsequently call the
* <code>checkPermission</code> method on the
* previously-saved AccessControlContext object. A sample call is the
* following:
*
* <pre>
* acc.checkPermission(permission)
* </pre>
*
* @see AccessController
*
* @author Roland Schemers
*/
public final class AccessControlContext {
// isPrivileged and isAuthorized are referenced by the VM - do not remove
// or change their names
private boolean isPrivileged;
private boolean isAuthorized = false;
// Note: This field is directly used by the virtual machine
// native codes. Don't touch it.
private static boolean debugInit = false;
{
if (debugInit)
return debug;
else {
debugInit = true;
}
return debug;
}
}
/**
* Create an AccessControlContext with the given array of ProtectionDomains.
* Context must not be null. Duplicate domains will be removed from the
* context.
*
* @param context the ProtectionDomains associated with this context.
* The non-duplicate domains are copied from the array. Subsequent
* changes to the array will not affect this AccessControlContext.
* @throws NullPointerException if <code>context</code> is <code>null</code>
*/
{
} else {
}
} else {
}
if (!v.isEmpty()) {
}
}
}
/**
* Create a new <code>AccessControlContext</code> with the given
* <code>AccessControlContext</code> and <code>DomainCombiner</code>.
* This constructor associates the provided
* <code>DomainCombiner</code> with the provided
* <code>AccessControlContext</code>.
*
* <p>
*
* @param acc the <code>AccessControlContext</code> associated
* with the provided <code>DomainCombiner</code>.
*
* @param combiner the <code>DomainCombiner</code> to be associated
* with the provided <code>AccessControlContext</code>.
*
* @exception NullPointerException if the provided
* <code>context</code> is <code>null</code>.
*
* @exception SecurityException if a security manager is installed and the
* caller does not have the "createAccessControlContext"
* {@link SecurityPermission}
* @since 1.3
*/
this.isAuthorized = true;
}
// we do not need to run the combine method on the
// provided ACC. it was already "combined" when the
// context was originally retrieved.
//
// at this point in time, we simply throw away the old
// combiner and use the newly provided one.
}
/**
* package private for AccessController
*/
}
this.isAuthorized = true;
}
/**
* package private constructor for AccessController.getContext()
*/
boolean isPrivileged)
{
this.isPrivileged = isPrivileged;
this.isAuthorized = true;
}
/**
* Constructor for JavaSecurityAccess.doIntersectionPrivilege()
*/
{
this.privilegedContext = privilegedContext;
this.isPrivileged = true;
}
/**
* Returns this context's context.
*/
return context;
}
/**
* Returns true if this context is privileged.
*/
boolean isPrivileged()
{
return isPrivileged;
}
/**
* get the assigned combiner from the privileged or inherited context
*/
if (isPrivileged) {
} else {
}
}
return null;
}
/**
* Get the <code>DomainCombiner</code> associated with this
* <code>AccessControlContext</code>.
*
* <p>
*
* @return the <code>DomainCombiner</code> associated with this
* <code>AccessControlContext</code>, or <code>null</code>
* if there is none.
*
* @exception SecurityException if a security manager is installed and
* the caller does not have the "getDomainCombiner"
* {@link SecurityPermission}
* @since 1.3
*/
}
return combiner;
}
/**
* Determines whether the access request indicated by the
* specified permission should be allowed or denied, based on
* the security policy currently in effect, and the context in
* this object. The request is allowed only if every ProtectionDomain
* in the context implies the permission. Otherwise the request is
* denied.
*
* <p>
* This method quietly returns if the access request
* is permitted, or throws a suitable AccessControlException otherwise.
*
* @param perm the requested permission.
*
* @exception AccessControlException if the specified permission
* is not permitted, based on the current security policy and the
* context encapsulated by this object.
* @exception NullPointerException if the permission to check for is null.
*/
throws AccessControlException
{
boolean dumpDebug = false;
throw new NullPointerException("permission can't be null");
}
// If "codebase" is not specified, we dump the info by default.
if (!dumpDebug) {
// If "codebase" is specified, only dump if the specified code
// value is in the stack.
dumpDebug = true;
break;
}
}
}
}
} else {
}
}
}
}
/*
* iterate through the ProtectionDomains in the context.
* Stop at the first one that doesn't allow the
* requested permission (throwing an exception).
*
*/
/* if ctxt is null, all we had on the stack were system domains,
or the first domain was a Privileged system domain. This
is to make the common case for system code very fast */
return;
if (dumpDebug) {
}
// Want to make sure this is always displayed for failure,
// but do not want to display again if already displayed
// above.
if (!dumpDebug) {
}
return null;
}
});
}
}
}
// allow if all of them allowed access
if (dumpDebug) {
}
return;
}
/**
* Take the stack-based context (this) and combine it with the
* privileged or inherited context, if need be.
*/
// the assigned (privileged or inherited) context
if (isPrivileged) {
} else {
}
// this.context could be null if only system code is on the stack;
// in that case, ignore the stack context
// acc.context could be null if only system code was involved;
// in that case, ignore the assigned context
// let the assigned acc's combiner do its thing
}
// optimization: if neither have contexts; return acc if possible
// rather than this, because acc might have a combiner
if (skipAssigned && skipStack) {
return this;
}
// optimization: if there is no stack context; there is no reason
// to compress the assigned context, it already is compressed
if (skipStack) {
return acc;
}
// optimization: if there is no assigned context and the stack length
// is less then or equal to two; there is no reason to compress the
// stack context, it already is
return this;
}
// optimization: if there is a single stack domain and that domain
// is already in the assigned context; no need to combine
return acc;
}
// now we combine both of them, and create a new context
// first copy in the assigned context domains, no need to compress
if (!skipAssigned) {
}
// now add the stack context domains, discarding nulls and duplicates
for (int j = 0; j < n; j++) {
continue outer;
}
}
}
}
// if length isn't equal, we need to shorten the array
// optimization: if we didn't really combine anything
return acc;
} else if (skipAssigned && n == slen) {
return this;
}
}
// return new AccessControlContext(pd, false);
// Reuse existing ACC
this.isPrivileged = false;
return this;
}
// the assigned ACC's combiner is not null --
// let the combiner do its thing
// XXX we could add optimizations to 'current' here ...
}
// No need to clone current and assigned.context
// combine() will not update them
// return new AccessControlContext(combinedPds, assigned.combiner);
// Reuse existing ACC
this.context = combinedPds;
this.isPrivileged = false;
return this;
}
/**
* Checks two AccessControlContext objects for equality.
* Checks that <i>obj</i> is
* an AccessControlContext and has the same set of ProtectionDomains
* as this context.
* <P>
* @param obj the object we are testing for equality with this object.
* @return true if <i>obj</i> is an AccessControlContext, and has the
* same set of ProtectionDomains as this context, false otherwise.
*/
if (obj == this)
return true;
if (! (obj instanceof AccessControlContext))
return false;
}
return false;
return false;
return false;
return false;
return true;
}
boolean match = false;
//
// ProtectionDomains within an ACC currently cannot be null
// and this is enforced by the constructor and the various
// optimize methods. However, historically this logic made attempts
// to support the notion of a null PD and therefore this logic continues
// to support that notion.
match = false;
}
} else {
// Class check required to avoid PD exposure (4285406)
}
}
if (!match) return false;
}
return match;
}
/**
* Returns the hash code value for this context. The hash code
* is computed by exclusive or-ing the hash code of all the protection
* domains in the context together.
*
* @return a hash code value for this context.
*/
public int hashCode() {
int hashCode = 0;
return hashCode;
}
return hashCode;
}
}