mirror of
https://github.com/openjdk/jdk.git
synced 2025-08-27 06:45:07 +02:00
8338411: Implement JEP 486: Permanently Disable the Security Manager
Co-authored-by: Sean Mullan <mullan@openjdk.org> Co-authored-by: Alan Bateman <alanb@openjdk.org> Co-authored-by: Weijun Wang <weijun@openjdk.org> Co-authored-by: Aleksei Efimov <aefimov@openjdk.org> Co-authored-by: Brian Burkhalter <bpb@openjdk.org> Co-authored-by: Daniel Fuchs <dfuchs@openjdk.org> Co-authored-by: Harshitha Onkar <honkar@openjdk.org> Co-authored-by: Joe Wang <joehw@openjdk.org> Co-authored-by: Jorn Vernee <jvernee@openjdk.org> Co-authored-by: Justin Lu <jlu@openjdk.org> Co-authored-by: Kevin Walls <kevinw@openjdk.org> Co-authored-by: Lance Andersen <lancea@openjdk.org> Co-authored-by: Naoto Sato <naoto@openjdk.org> Co-authored-by: Roger Riggs <rriggs@openjdk.org> Co-authored-by: Brent Christian <bchristi@openjdk.org> Co-authored-by: Stuart Marks <smarks@openjdk.org> Co-authored-by: Ian Graves <igraves@openjdk.org> Co-authored-by: Phil Race <prr@openjdk.org> Co-authored-by: Erik Gahlin <egahlin@openjdk.org> Co-authored-by: Jaikiran Pai <jpai@openjdk.org> Reviewed-by: kevinw, aivanov, rriggs, lancea, coffeys, dfuchs, ihse, erikj, cjplummer, coleenp, naoto, mchung, prr, weijun, joehw, azvegint, psadhukhan, bchristi, sundar, attila
This commit is contained in:
Sean Mullan
parent
c12b386d19
commit
db85090553
1885 changed files with 5528 additions and 65650 deletions
|
|
@ -1,5 +1,5 @@
|
|||
/*
|
||||
* Copyright (c) 1997, 2023, Oracle and/or its affiliates. All rights reserved.
|
||||
* Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
|
||||
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
||||
*
|
||||
* This code is free software; you can redistribute it and/or modify it
|
||||
|
|
@ -28,58 +28,16 @@ package java.security;
|
|||
import java.util.ArrayList;
|
||||
import java.util.List;
|
||||
|
||||
import sun.security.util.Debug;
|
||||
import sun.security.util.FilePermCompat;
|
||||
import sun.security.util.SecurityConstants;
|
||||
|
||||
|
||||
/**
|
||||
* An {@code 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},
|
||||
* that is equivalent to the {@code checkPermission} method
|
||||
* in the {@code AccessController} class, with one difference:
|
||||
* The {@code checkPermission} method makes access decisions based on the
|
||||
* context it encapsulates,
|
||||
* rather than that of the current execution thread.
|
||||
*
|
||||
* <p>Thus, the purpose of {@code 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 {@code AccessControlContext} is created by calling the
|
||||
* {@code AccessController.getContext} method.
|
||||
* The {@code getContext} method takes a "snapshot"
|
||||
* of the current calling context, and places
|
||||
* it in an {@code 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} method on the
|
||||
* previously-saved {@code AccessControlContext} object. A sample call is the
|
||||
* following:
|
||||
*
|
||||
* <pre>
|
||||
* acc.checkPermission(permission)
|
||||
* </pre>
|
||||
*
|
||||
* @see AccessController
|
||||
* {@code AccessControlContext} was used with the Security Manager for access
|
||||
* control decisions based on context that it encapsulated. This feature no
|
||||
* longer exists.
|
||||
*
|
||||
* @author Roland Schemers
|
||||
* @since 1.2
|
||||
* @deprecated This class is only useful in conjunction with
|
||||
* {@linkplain SecurityManager the Security Manager}, which is deprecated
|
||||
* and subject to removal in a future release. Consequently, this class
|
||||
* is also deprecated and subject to removal. There is no replacement for
|
||||
* the Security Manager or this class.
|
||||
* @deprecated This class was only useful in conjunction with the {@linkplain
|
||||
* SecurityManager the Security Manager}, which is no longer supported.
|
||||
* There is no replacement for the Security Manager or this class.
|
||||
*/
|
||||
|
||||
@Deprecated(since="17", forRemoval=true)
|
||||
|
|
@ -98,32 +56,6 @@ public final class AccessControlContext {
|
|||
@SuppressWarnings("removal")
|
||||
private DomainCombiner combiner = null;
|
||||
|
||||
// limited privilege scope
|
||||
private Permission[] permissions;
|
||||
private AccessControlContext parent;
|
||||
private boolean isWrapped;
|
||||
|
||||
// is constrained by limited privilege scope?
|
||||
private boolean isLimited;
|
||||
private ProtectionDomain[] limitedContext;
|
||||
|
||||
private static boolean debugInit = false;
|
||||
private static Debug debug = null;
|
||||
|
||||
@SuppressWarnings("removal")
|
||||
static Debug getDebug()
|
||||
{
|
||||
if (debugInit)
|
||||
return debug;
|
||||
else {
|
||||
if (Policy.isSet()) {
|
||||
debug = Debug.getInstance("access");
|
||||
debugInit = true;
|
||||
}
|
||||
return debug;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Create an {@code AccessControlContext} with the given array of
|
||||
* {@code ProtectionDomain} objects.
|
||||
|
|
@ -148,7 +80,7 @@ public final class AccessControlContext {
|
|||
} else {
|
||||
List<ProtectionDomain> v = new ArrayList<>(context.length);
|
||||
for (int i =0; i< context.length; i++) {
|
||||
if ((context[i] != null) && (!v.contains(context[i])))
|
||||
if ((context[i] != null) && (!v.contains(context[i])))
|
||||
v.add(context[i]);
|
||||
}
|
||||
if (!v.isEmpty()) {
|
||||
|
|
@ -174,179 +106,14 @@ public final class AccessControlContext {
|
|||
* @throws NullPointerException if the provided
|
||||
* {@code context} is {@code null}.
|
||||
*
|
||||
* @throws SecurityException if a security manager is installed and the
|
||||
* caller does not have the "createAccessControlContext"
|
||||
* {@link SecurityPermission}
|
||||
* @since 1.3
|
||||
*/
|
||||
public AccessControlContext(AccessControlContext acc,
|
||||
@SuppressWarnings("removal") DomainCombiner combiner) {
|
||||
|
||||
this(acc, combiner, false);
|
||||
}
|
||||
|
||||
/**
|
||||
* package private to allow calls from {@code ProtectionDomain} without
|
||||
* performing the security check for
|
||||
* {@linkplain SecurityConstants#CREATE_ACC_PERMISSION} permission
|
||||
*/
|
||||
AccessControlContext(AccessControlContext acc,
|
||||
@SuppressWarnings("removal") DomainCombiner combiner,
|
||||
boolean preauthorized) {
|
||||
if (!preauthorized) {
|
||||
@SuppressWarnings("removal")
|
||||
SecurityManager sm = System.getSecurityManager();
|
||||
if (sm != null) {
|
||||
sm.checkPermission(SecurityConstants.CREATE_ACC_PERMISSION);
|
||||
this.isAuthorized = true;
|
||||
}
|
||||
} else {
|
||||
this.isAuthorized = true;
|
||||
}
|
||||
|
||||
this.context = acc.context;
|
||||
|
||||
// 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.
|
||||
this.combiner = combiner;
|
||||
}
|
||||
|
||||
/**
|
||||
* package private for {@code AccessController}
|
||||
*
|
||||
* This "argument wrapper" context will be passed as the actual context
|
||||
* parameter on an internal doPrivileged() call used in the implementation.
|
||||
*/
|
||||
AccessControlContext(ProtectionDomain caller, @SuppressWarnings("removal") DomainCombiner combiner,
|
||||
AccessControlContext parent, AccessControlContext context,
|
||||
Permission[] perms)
|
||||
{
|
||||
/*
|
||||
* Combine the domains from the doPrivileged() context into our
|
||||
* wrapper context, if necessary.
|
||||
*/
|
||||
ProtectionDomain[] callerPDs = null;
|
||||
if (caller != null) {
|
||||
callerPDs = new ProtectionDomain[] { caller };
|
||||
}
|
||||
if (context != null) {
|
||||
if (combiner != null) {
|
||||
this.context = combiner.combine(callerPDs, context.context);
|
||||
} else {
|
||||
this.context = combine(callerPDs, context.context);
|
||||
}
|
||||
} else {
|
||||
/*
|
||||
* Call combiner even if there is seemingly nothing to combine.
|
||||
*/
|
||||
if (combiner != null) {
|
||||
this.context = combiner.combine(callerPDs, null);
|
||||
} else {
|
||||
this.context = combine(callerPDs, null);
|
||||
}
|
||||
}
|
||||
this.combiner = combiner;
|
||||
|
||||
Permission[] tmp = null;
|
||||
if (perms != null) {
|
||||
tmp = new Permission[perms.length];
|
||||
for (int i=0; i < perms.length; i++) {
|
||||
if (perms[i] == null) {
|
||||
throw new NullPointerException("permission can't be null");
|
||||
}
|
||||
|
||||
/*
|
||||
* An AllPermission argument is equivalent to calling
|
||||
* doPrivileged() without any limit permissions.
|
||||
*/
|
||||
if (perms[i].getClass() == AllPermission.class) {
|
||||
parent = null;
|
||||
}
|
||||
// Add altPath into permission for compatibility.
|
||||
tmp[i] = FilePermCompat.newPermPlusAltPath(perms[i]);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* For a doPrivileged() with limited privilege scope, initialize
|
||||
* the relevant fields.
|
||||
*
|
||||
* The limitedContext field contains the union of all domains which
|
||||
* are enclosed by this limited privilege scope. In other words,
|
||||
* it contains all of the domains which could potentially be checked
|
||||
* if none of the limiting permissions implied a requested permission.
|
||||
*/
|
||||
if (parent != null) {
|
||||
this.limitedContext = combine(parent.context, parent.limitedContext);
|
||||
this.isLimited = true;
|
||||
this.isWrapped = true;
|
||||
this.permissions = tmp;
|
||||
this.parent = parent;
|
||||
this.privilegedContext = context; // used in checkPermission2()
|
||||
}
|
||||
this.isAuthorized = true;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* package private constructor for {@code AccessController.getContext()}
|
||||
*/
|
||||
|
||||
AccessControlContext(ProtectionDomain[] context,
|
||||
boolean isPrivileged)
|
||||
{
|
||||
this.context = context;
|
||||
this.isPrivileged = isPrivileged;
|
||||
this.isAuthorized = true;
|
||||
}
|
||||
|
||||
/**
|
||||
* Constructor for {@code JavaSecurityAccess.doIntersectionPrivilege()}
|
||||
*/
|
||||
AccessControlContext(ProtectionDomain[] context,
|
||||
AccessControlContext privilegedContext)
|
||||
{
|
||||
this.context = context;
|
||||
this.privilegedContext = privilegedContext;
|
||||
this.isPrivileged = true;
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns this context's context.
|
||||
*/
|
||||
ProtectionDomain[] getContext() {
|
||||
return context;
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns {@code true} if this context is privileged.
|
||||
*/
|
||||
boolean isPrivileged()
|
||||
{
|
||||
return isPrivileged;
|
||||
}
|
||||
|
||||
/**
|
||||
* get the assigned combiner from the privileged or inherited context
|
||||
*/
|
||||
@SuppressWarnings("removal")
|
||||
DomainCombiner getAssignedCombiner() {
|
||||
AccessControlContext acc;
|
||||
if (isPrivileged) {
|
||||
acc = privilegedContext;
|
||||
} else {
|
||||
acc = AccessController.getInheritedAccessControlContext();
|
||||
}
|
||||
if (acc != null) {
|
||||
return acc.combiner;
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
/**
|
||||
* Get the {@code DomainCombiner} associated with this
|
||||
* {@code AccessControlContext}.
|
||||
|
|
@ -355,404 +122,26 @@ public final class AccessControlContext {
|
|||
* {@code AccessControlContext}, or {@code null}
|
||||
* if there is none.
|
||||
*
|
||||
* @throws SecurityException if a security manager is installed and
|
||||
* the caller does not have the "getDomainCombiner"
|
||||
* {@link SecurityPermission}
|
||||
* @since 1.3
|
||||
*/
|
||||
@SuppressWarnings("removal")
|
||||
public DomainCombiner getDomainCombiner() {
|
||||
|
||||
SecurityManager sm = System.getSecurityManager();
|
||||
if (sm != null) {
|
||||
sm.checkPermission(SecurityConstants.GET_COMBINER_PERMISSION);
|
||||
}
|
||||
return getCombiner();
|
||||
}
|
||||
|
||||
/**
|
||||
* package private for {@code AccessController}
|
||||
*/
|
||||
@SuppressWarnings("removal")
|
||||
DomainCombiner getCombiner() {
|
||||
return combiner;
|
||||
}
|
||||
|
||||
boolean isAuthorized() {
|
||||
return isAuthorized;
|
||||
}
|
||||
|
||||
/**
|
||||
* 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
|
||||
* {@code ProtectionDomain} in the context implies the permission.
|
||||
* Otherwise the request is denied.
|
||||
* Throws {@code AccessControlException}.
|
||||
*
|
||||
* <p>
|
||||
* This method quietly returns if the access request
|
||||
* is permitted, or throws a suitable {@code AccessControlException}
|
||||
* otherwise.
|
||||
*
|
||||
* @param perm the requested permission.
|
||||
*
|
||||
* @throws AccessControlException if the specified permission
|
||||
* is not permitted, based on the current security policy and the
|
||||
* context encapsulated by this object.
|
||||
* @throws NullPointerException if the permission to check for is
|
||||
* {@code null}.
|
||||
* @param perm ignored
|
||||
* @throws AccessControlException always
|
||||
*/
|
||||
@SuppressWarnings("removal")
|
||||
public void checkPermission(Permission perm)
|
||||
throws AccessControlException
|
||||
{
|
||||
boolean dumpDebug = false;
|
||||
|
||||
if (perm == null) {
|
||||
throw new NullPointerException("permission can't be null");
|
||||
}
|
||||
if (getDebug() != null) {
|
||||
// If "codebase" is not specified, we dump the info by default.
|
||||
dumpDebug = !Debug.isOn("codebase=");
|
||||
if (!dumpDebug) {
|
||||
// If "codebase" is specified, only dump if the specified code
|
||||
// value is in the stack.
|
||||
for (int i = 0; context != null && i < context.length; i++) {
|
||||
if (context[i].getCodeSource() != null &&
|
||||
context[i].getCodeSource().getLocation() != null &&
|
||||
Debug.isOn("codebase=" + context[i].getCodeSource().getLocation().toString())) {
|
||||
dumpDebug = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
dumpDebug &= !Debug.isOn("permission=") ||
|
||||
Debug.isOn("permission=" + perm.getClass().getCanonicalName());
|
||||
|
||||
if (dumpDebug && Debug.isOn("stack")) {
|
||||
Thread.dumpStack();
|
||||
}
|
||||
|
||||
if (dumpDebug && Debug.isOn("domain")) {
|
||||
if (context == null) {
|
||||
debug.println("domain (context is null)");
|
||||
} else {
|
||||
for (int i=0; i< context.length; i++) {
|
||||
debug.println("domain "+i+" "+context[i]);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* 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 */
|
||||
|
||||
if (context == null) {
|
||||
checkPermission2(perm);
|
||||
return;
|
||||
}
|
||||
|
||||
for (int i=0; i< context.length; i++) {
|
||||
if (context[i] != null && !context[i].impliesWithAltFilePerm(perm)) {
|
||||
if (dumpDebug) {
|
||||
debug.println("access denied " + perm);
|
||||
}
|
||||
|
||||
if (Debug.isOn("failure") && debug != null) {
|
||||
// Want to make sure this is always displayed for failure,
|
||||
// but do not want to display again if already displayed
|
||||
// above.
|
||||
if (!dumpDebug) {
|
||||
debug.println("access denied " + perm);
|
||||
}
|
||||
Thread.dumpStack();
|
||||
final ProtectionDomain pd = context[i];
|
||||
final Debug db = debug;
|
||||
AccessController.doPrivileged (new PrivilegedAction<>() {
|
||||
public Void run() {
|
||||
db.println("domain that failed "+pd);
|
||||
return null;
|
||||
}
|
||||
});
|
||||
}
|
||||
throw new AccessControlException("access denied "+perm, perm);
|
||||
}
|
||||
}
|
||||
|
||||
// allow if all of them allowed access
|
||||
if (dumpDebug) {
|
||||
debug.println("access allowed "+perm);
|
||||
}
|
||||
|
||||
checkPermission2(perm);
|
||||
throw new AccessControlException("checking permissions is not supported");
|
||||
}
|
||||
|
||||
/*
|
||||
* Check the domains associated with the limited privilege scope.
|
||||
*/
|
||||
private void checkPermission2(Permission perm) {
|
||||
if (!isLimited) {
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* Check the doPrivileged() context parameter, if present.
|
||||
*/
|
||||
if (privilegedContext != null) {
|
||||
privilegedContext.checkPermission2(perm);
|
||||
}
|
||||
|
||||
/*
|
||||
* Ignore the limited permissions and parent fields of a wrapper
|
||||
* context since they were already carried down into the unwrapped
|
||||
* context.
|
||||
*/
|
||||
if (isWrapped) {
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* Try to match any limited privilege scope.
|
||||
*/
|
||||
if (permissions != null) {
|
||||
Class<?> permClass = perm.getClass();
|
||||
for (int i=0; i < permissions.length; i++) {
|
||||
Permission limit = permissions[i];
|
||||
if (limit.getClass().equals(permClass) && limit.implies(perm)) {
|
||||
return;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Check the limited privilege scope up the call stack or the inherited
|
||||
* parent thread call stack of this ACC.
|
||||
*/
|
||||
if (parent != null) {
|
||||
/*
|
||||
* As an optimization, if the parent context is the inherited call
|
||||
* stack context from a parent thread then checking the protection
|
||||
* domains of the parent context is redundant since they have
|
||||
* already been merged into the child thread's context by
|
||||
* optimize(). When parent is set to an inherited context this
|
||||
* context was not directly created by a limited scope
|
||||
* doPrivileged() and it does not have its own limited permissions.
|
||||
*/
|
||||
if (permissions == null) {
|
||||
parent.checkPermission2(perm);
|
||||
} else {
|
||||
parent.checkPermission(perm);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Take the stack-based context (this) and combine it with the
|
||||
* privileged or inherited context, if need be. Any limited
|
||||
* privilege scope is flagged regardless of whether the assigned
|
||||
* context comes from an immediately enclosing limited doPrivileged().
|
||||
* The limited privilege scope can indirectly flow from the inherited
|
||||
* parent thread or an assigned context previously captured by getContext().
|
||||
*/
|
||||
@SuppressWarnings("removal")
|
||||
AccessControlContext optimize() {
|
||||
// the assigned (privileged or inherited) context
|
||||
AccessControlContext acc;
|
||||
DomainCombiner combiner = null;
|
||||
AccessControlContext parent = null;
|
||||
Permission[] permissions = null;
|
||||
|
||||
if (isPrivileged) {
|
||||
acc = privilegedContext;
|
||||
if (acc != null) {
|
||||
/*
|
||||
* If the context is from a limited scope doPrivileged() then
|
||||
* copy the permissions and parent fields out of the wrapper
|
||||
* context that was created to hold them.
|
||||
*/
|
||||
if (acc.isWrapped) {
|
||||
permissions = acc.permissions;
|
||||
parent = acc.parent;
|
||||
}
|
||||
}
|
||||
} else {
|
||||
acc = AccessController.getInheritedAccessControlContext();
|
||||
if (acc != null) {
|
||||
/*
|
||||
* If the inherited context is constrained by a limited scope
|
||||
* doPrivileged() then set it as our parent so we will process
|
||||
* the non-domain-related state.
|
||||
*/
|
||||
if (acc.isLimited) {
|
||||
parent = acc;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// this.context could be null if only system code is on the stack;
|
||||
// in that case, ignore the stack context
|
||||
boolean skipStack = (context == null);
|
||||
|
||||
// acc.context could be null if only system code was involved;
|
||||
// in that case, ignore the assigned context
|
||||
boolean skipAssigned = (acc == null || acc.context == null);
|
||||
ProtectionDomain[] assigned = (skipAssigned) ? null : acc.context;
|
||||
ProtectionDomain[] pd;
|
||||
|
||||
// if there is no enclosing limited privilege scope on the stack or
|
||||
// inherited from a parent thread
|
||||
boolean skipLimited = ((acc == null || !acc.isWrapped) && parent == null);
|
||||
|
||||
if (acc != null && acc.combiner != null) {
|
||||
// let the assigned acc's combiner do its thing
|
||||
if (getDebug() != null) {
|
||||
debug.println("AccessControlContext invoking the Combiner");
|
||||
}
|
||||
|
||||
// No need to clone current and assigned.context
|
||||
// combine() will not update them
|
||||
combiner = acc.combiner;
|
||||
pd = combiner.combine(context, assigned);
|
||||
} else {
|
||||
if (skipStack) {
|
||||
if (skipAssigned) {
|
||||
calculateFields(acc, parent, permissions);
|
||||
return this;
|
||||
} else if (skipLimited) {
|
||||
return acc;
|
||||
}
|
||||
} else if (assigned != null) {
|
||||
if (skipLimited) {
|
||||
// optimization: if there is a single stack domain and
|
||||
// that domain is already in the assigned context; no
|
||||
// need to combine
|
||||
if (context.length == 1 && context[0] == assigned[0]) {
|
||||
return acc;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pd = combine(context, assigned);
|
||||
if (skipLimited && !skipAssigned && pd == assigned) {
|
||||
return acc;
|
||||
} else if (skipAssigned && pd == context) {
|
||||
calculateFields(acc, parent, permissions);
|
||||
return this;
|
||||
}
|
||||
}
|
||||
|
||||
// Reuse existing ACC
|
||||
this.context = pd;
|
||||
this.combiner = combiner;
|
||||
this.isPrivileged = false;
|
||||
|
||||
calculateFields(acc, parent, permissions);
|
||||
return this;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Combine the current (stack) and assigned domains.
|
||||
*/
|
||||
private static ProtectionDomain[] combine(ProtectionDomain[] current,
|
||||
ProtectionDomain[] assigned) {
|
||||
|
||||
// current could be null if only system code is on the stack;
|
||||
// in that case, ignore the stack context
|
||||
boolean skipStack = (current == null);
|
||||
|
||||
// assigned could be null if only system code was involved;
|
||||
// in that case, ignore the assigned context
|
||||
boolean skipAssigned = (assigned == null);
|
||||
|
||||
int slen = (skipStack) ? 0 : current.length;
|
||||
|
||||
// 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
|
||||
if (skipAssigned && slen <= 2) {
|
||||
return current;
|
||||
}
|
||||
|
||||
int n = (skipAssigned) ? 0 : assigned.length;
|
||||
|
||||
// now we combine both of them, and create a new context
|
||||
ProtectionDomain[] pd = new ProtectionDomain[slen + n];
|
||||
|
||||
// first copy in the assigned context domains, no need to compress
|
||||
if (!skipAssigned) {
|
||||
System.arraycopy(assigned, 0, pd, 0, n);
|
||||
}
|
||||
|
||||
// now add the stack context domains, discarding nulls and duplicates
|
||||
outer:
|
||||
for (int i = 0; i < slen; i++) {
|
||||
ProtectionDomain sd = current[i];
|
||||
if (sd != null) {
|
||||
for (int j = 0; j < n; j++) {
|
||||
if (sd == pd[j]) {
|
||||
continue outer;
|
||||
}
|
||||
}
|
||||
pd[n++] = sd;
|
||||
}
|
||||
}
|
||||
|
||||
// if length isn't equal, we need to shorten the array
|
||||
if (n != pd.length) {
|
||||
// optimization: if we didn't really combine anything
|
||||
if (!skipAssigned && n == assigned.length) {
|
||||
return assigned;
|
||||
} else if (skipAssigned && n == slen) {
|
||||
return current;
|
||||
}
|
||||
ProtectionDomain[] tmp = new ProtectionDomain[n];
|
||||
System.arraycopy(pd, 0, tmp, 0, n);
|
||||
pd = tmp;
|
||||
}
|
||||
|
||||
return pd;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Calculate the additional domains that could potentially be reached via
|
||||
* limited privilege scope. Mark the context as being subject to limited
|
||||
* privilege scope unless the reachable domains (if any) are already
|
||||
* contained in this domain context (in which case any limited
|
||||
* privilege scope checking would be redundant).
|
||||
*/
|
||||
private void calculateFields(AccessControlContext assigned,
|
||||
AccessControlContext parent, Permission[] permissions)
|
||||
{
|
||||
ProtectionDomain[] parentLimit = null;
|
||||
ProtectionDomain[] assignedLimit = null;
|
||||
ProtectionDomain[] newLimit;
|
||||
|
||||
parentLimit = (parent != null)? parent.limitedContext: null;
|
||||
assignedLimit = (assigned != null)? assigned.limitedContext: null;
|
||||
newLimit = combine(parentLimit, assignedLimit);
|
||||
if (newLimit != null) {
|
||||
if (context == null || !containsAllPDs(newLimit, context)) {
|
||||
this.limitedContext = newLimit;
|
||||
this.permissions = permissions;
|
||||
this.parent = parent;
|
||||
this.isLimited = true;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Checks two {@code AccessControlContext} objects for equality.
|
||||
* Checks that {@code obj} is
|
||||
|
|
@ -770,8 +159,7 @@ public final class AccessControlContext {
|
|||
return true;
|
||||
|
||||
return obj instanceof AccessControlContext that
|
||||
&& equalContext(that)
|
||||
&& equalLimitedContext(that);
|
||||
&& equalContext(that);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -805,87 +193,6 @@ public final class AccessControlContext {
|
|||
return true;
|
||||
}
|
||||
|
||||
/*
|
||||
* Compare for equality based on state that is captured during a
|
||||
* call to AccessController.getContext() when a limited privilege
|
||||
* scope is in effect.
|
||||
*/
|
||||
private boolean equalLimitedContext(AccessControlContext that) {
|
||||
if (that == null)
|
||||
return false;
|
||||
|
||||
/*
|
||||
* If neither instance has limited privilege scope then we're done.
|
||||
*/
|
||||
if (!this.isLimited && !that.isLimited)
|
||||
return true;
|
||||
|
||||
/*
|
||||
* If only one instance has limited privilege scope then we're done.
|
||||
*/
|
||||
if (!(this.isLimited && that.isLimited))
|
||||
return false;
|
||||
|
||||
/*
|
||||
* Wrapped instances should never escape outside the implementation
|
||||
* this class and AccessController so this will probably never happen
|
||||
* but it only makes any sense to compare if they both have the same
|
||||
* isWrapped state.
|
||||
*/
|
||||
if ((this.isWrapped && !that.isWrapped) ||
|
||||
(!this.isWrapped && that.isWrapped)) {
|
||||
return false;
|
||||
}
|
||||
|
||||
if (this.permissions == null && that.permissions != null)
|
||||
return false;
|
||||
|
||||
if (this.permissions != null && that.permissions == null)
|
||||
return false;
|
||||
|
||||
if (!(this.containsAllLimits(that) && that.containsAllLimits(this)))
|
||||
return false;
|
||||
|
||||
/*
|
||||
* Skip through any wrapped contexts.
|
||||
*/
|
||||
AccessControlContext thisNextPC = getNextPC(this);
|
||||
AccessControlContext thatNextPC = getNextPC(that);
|
||||
|
||||
/*
|
||||
* The protection domains and combiner of a privilegedContext are
|
||||
* not relevant because they have already been included in the context
|
||||
* of this instance by optimize() so we only care about any limited
|
||||
* privilege state they may have.
|
||||
*/
|
||||
if (thisNextPC == null && thatNextPC != null && thatNextPC.isLimited)
|
||||
return false;
|
||||
|
||||
if (thisNextPC != null && !thisNextPC.equalLimitedContext(thatNextPC))
|
||||
return false;
|
||||
|
||||
if (this.parent == null && that.parent != null)
|
||||
return false;
|
||||
|
||||
if (this.parent != null && !this.parent.equals(that.parent))
|
||||
return false;
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
/*
|
||||
* Follow the privilegedContext link making our best effort to skip
|
||||
* through any wrapper contexts.
|
||||
*/
|
||||
private static AccessControlContext getNextPC(AccessControlContext acc) {
|
||||
while (acc != null && acc.privilegedContext != null) {
|
||||
acc = acc.privilegedContext;
|
||||
if (!acc.isWrapped)
|
||||
return acc;
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
private static boolean containsAllPDs(ProtectionDomain[] thisContext,
|
||||
ProtectionDomain[] thatContext) {
|
||||
boolean match = false;
|
||||
|
|
@ -919,27 +226,6 @@ public final class AccessControlContext {
|
|||
return match;
|
||||
}
|
||||
|
||||
private boolean containsAllLimits(AccessControlContext that) {
|
||||
boolean match = false;
|
||||
|
||||
if (this.permissions == null && that.permissions == null)
|
||||
return true;
|
||||
|
||||
for (int i = 0; i < this.permissions.length; i++) {
|
||||
Permission limit = this.permissions[i];
|
||||
Class <?> limitClass = limit.getClass();
|
||||
match = false;
|
||||
for (int j = 0; (j < that.permissions.length) && !match; j++) {
|
||||
Permission perm = that.permissions[j];
|
||||
match = (limitClass.equals(perm.getClass()) &&
|
||||
limit.equals(perm));
|
||||
}
|
||||
if (!match) return false;
|
||||
}
|
||||
return match;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* {@return the hash code value for this context}
|
||||
* The hash code is computed by exclusive or-ing the hash code of all the
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue