/*
* @(#)file AclImpl.java
* @(#)author Sun Microsystems, Inc.
* @(#)version 4.11
* @(#)date 05/08/26
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
*/
package com.sun.jmx.snmp.IPAcl;
import java.security.Principal;
import java.security.acl.Acl;
import java.security.acl.AclEntry;
import java.security.acl.NotOwnerException;
import java.io.Serializable;
import java.util.Vector;
import java.util.Enumeration;
/**
* Represent an Access Control List (ACL) which is used to guard access to http adaptor.
* <P>
* It is a data structure with multiple ACL entries. Each ACL entry, of interface type
* AclEntry, contains a set of permissions and a set of communities associated with a
* particular principal. (A principal represents an entity such as a host or a group of host).
* Additionally, each ACL entry is specified as being either positive or negative.
* If positive, the permissions are to be granted to the associated principal.
* If negative, the permissions are to be denied.
*
* @see java.security.acl.Acl
* @version 4.11 12/19/03
* @author Sun Microsystems, Inc
*/
class AclImpl extends OwnerImpl implements Acl, Serializable {
private Vector entryList = null;
private String aclName = null;
/**
* Constructs the ACL with a specified owner
*
* @param owner owner of the ACL.
* @param name name of this ACL.
*/
public AclImpl (PrincipalImpl owner, String name) {
super(owner);
entryList = new Vector();
aclName = name;
}
/**
* Sets the name of this ACL.
*
* @param caller the principal invoking this method. It must be an owner
* of this ACL.
* @param name the name to be given to this ACL.
*
* @exception NotOwnerException if the caller principal is not an owner
* of this ACL.
* @see java.security.Principal
*/
public void setName(Principal caller, String name)
throws NotOwnerException {
if (!isOwner(caller))
throw new NotOwnerException();
aclName = name;
}
/**
* Returns the name of this ACL.
*
* @return the name of this ACL.
*/
public String getName(){
return aclName;
}
/**
* Adds an ACL entry to this ACL. An entry associates a principal (e.g., an individual or a group)
* with a set of permissions. Each principal can have at most one positive ACL entry
* (specifying permissions to be granted to the principal) and one negative ACL entry
* (specifying permissions to be denied). If there is already an ACL entry
* of the same type (negative or positive) already in the ACL, false is returned.
*
* @param caller the principal invoking this method. It must be an owner
* of this ACL.
* @param entry the ACL entry to be added to this ACL.
* @return true on success, false if an entry of the same type (positive
* or negative) for the same principal is already present in this ACL.
* @exception NotOwnerException if the caller principal is not an owner of
* this ACL.
* @see java.security.Principal
*/
public boolean addEntry(Principal caller, AclEntry entry)
throws NotOwnerException {
if (!isOwner(caller))
throw new NotOwnerException();
if (entryList.contains(entry))
return false;
/*
for (Enumeration e = entryList.elements();e.hasMoreElements();){
AclEntry ent = (AclEntry) e.nextElement();
if (ent.getPrincipal().equals(entry.getPrincipal()))
return false;
}
*/
entryList.addElement(entry);
return true;
}
/**
* Removes an ACL entry from this ACL.
*
* @param caller the principal invoking this method. It must be an owner
* of this ACL.
* @param entry the ACL entry to be removed from this ACL.
* @return true on success, false if the entry is not part of this ACL.
* @exception NotOwnerException if the caller principal is not an owner
* of this Acl.
* @see java.security.Principal
* @see java.security.acl.AclEntry
*/
public boolean removeEntry(Principal caller, AclEntry entry)
throws NotOwnerException {
if (!isOwner(caller))
throw new NotOwnerException();
return (entryList.removeElement(entry));
}
/**
* Removes all ACL entries from this ACL.
*
* @param caller the principal invoking this method. It must be an owner
* of this ACL.
* @exception NotOwnerException if the caller principal is not an owner of
* this Acl.
* @see java.security.Principal
*/
public void removeAll(Principal caller)
throws NotOwnerException {
if (!isOwner(caller))
throw new NotOwnerException();
entryList.removeAllElements();
}
/**
* Returns an enumeration for the set of allowed permissions for
* the specified principal
* (representing an entity such as an individual or a group).
* This set of allowed permissions is calculated as follows:
* <UL>
* <LI>If there is no entry in this Access Control List for the specified
* principal, an empty permission set is returned.</LI>
* <LI>Otherwise, the principal's group permission sets are determined.
* (A principal can belong to one or more groups, where a group is a group
* of principals, represented by the Group interface.)</LI>
* </UL>
* @param user the principal whose permission set is to be returned.
* @return the permission set specifying the permissions the principal
* is allowed.
* @see java.security.Principal
*/
public Enumeration getPermissions(Principal user){
Vector empty = new Vector();
for (Enumeration e = entryList.elements();e.hasMoreElements();){
AclEntry ent = (AclEntry) e.nextElement();
if (ent.getPrincipal().equals(user))
return ent.permissions();
}
return empty.elements();
}
/**
* Returns an enumeration of the entries in this ACL. Each element in the
* enumeration is of type AclEntry.
*
* @return an enumeration of the entries in this ACL.
*/
public Enumeration entries(){
return entryList.elements();
}
/**
* Checks whether or not the specified principal has the specified
* permission.
* If it does, true is returned, otherwise false is returned.
* More specifically, this method checks whether the passed permission
* is a member of the allowed permission set of the specified principal.
* The allowed permission set is determined by the same algorithm as is
* used by the getPermissions method.
*
* @param user the principal, assumed to be a valid authenticated Principal.
* @param perm the permission to be checked for.
* @return true if the principal has the specified permission,
* false otherwise.
* @see java.security.Principal
* @see java.security.Permission
*/
public boolean checkPermission(Principal user,
java.security.acl.Permission perm) {
for (Enumeration e = entryList.elements();e.hasMoreElements();){
AclEntry ent = (AclEntry) e.nextElement();
if (ent.getPrincipal().equals(user))
if (ent.checkPermission(perm)) return true;
}
return false;
}
/**
* Checks whether or not the specified principal has the specified
* permission.
* If it does, true is returned, otherwise false is returned.
* More specifically, this method checks whether the passed permission
* is a member of the allowed permission set of the specified principal.
* The allowed permission set is determined by the same algorithm as is
* used by the getPermissions method.
*
* @param user the principal, assumed to be a valid authenticated Principal.
* @param community the community name associated with the principal.
* @param perm the permission to be checked for.
* @return true if the principal has the specified permission, false
* otherwise.
* @see java.security.Principal
* @see java.security.Permission
*/
public boolean checkPermission(Principal user, String community,
java.security.acl.Permission perm) {
for (Enumeration e = entryList.elements();e.hasMoreElements();){
AclEntryImpl ent = (AclEntryImpl) e.nextElement();
if (ent.getPrincipal().equals(user))
if (ent.checkPermission(perm) && ent.checkCommunity(community)) return true;
}
return false;
}
/**
* Checks whether or not the specified community string is defined.
*
* @param community the community name associated with the principal.
*
* @return true if the specified community string is defined, false
* otherwise.
* @see java.security.Principal
* @see java.security.Permission
*/
public boolean checkCommunity(String community) {
for (Enumeration e = entryList.elements();e.hasMoreElements();){
AclEntryImpl ent = (AclEntryImpl) e.nextElement();
if (ent.checkCommunity(community)) return true;
}
return false;
}
/**
* Returns a string representation of the ACL contents.
*
* @return a string representation of the ACL contents.
*/
public String toString(){
return ("AclImpl: "+ getName());
}
}
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