/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jackrabbit.webdav.security;
import org.apache.jackrabbit.webdav.DavConstants;
import org.apache.jackrabbit.webdav.DavException;
import org.apache.jackrabbit.webdav.DavServletResponse;
import org.apache.jackrabbit.webdav.property.AbstractDavProperty;
import org.apache.jackrabbit.webdav.property.DavProperty;
import org.apache.jackrabbit.webdav.xml.DomUtil;
import org.apache.jackrabbit.webdav.xml.ElementIterator;
import org.apache.jackrabbit.webdav.xml.XmlSerializable;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* <code>AclProperty</code> defines a protected property that specifies the list
* of access control entries (ACEs). The set of ACEs define the privileges granted
* or denied to principals on the resource a given property instance belongs to.
* <br>
* RFC 3744 defines the following format for this property:
* <pre>
* <!ELEMENT acl (ace*) >
* <!ELEMENT ace ((principal | invert), (grant|deny), protected?, inherited?)>
* <!ELEMENT principal (href | all | authenticated | unauthenticated | property | self)>
* <!ELEMENT invert (principal)>
* <!ELEMENT grant (privilege+)>
* <!ELEMENT deny (privilege+)>
* <!ELEMENT protected EMPTY>
* <!ELEMENT inherited (href)>
* </pre>
*
* @see Principal for details regarding DAV:principal
* @see Privilege for details regarding DAV:privilege
*/
public class AclProperty extends AbstractDavProperty<List<AclProperty.Ace>> {
private final List<Ace> aces;
/**
* Create a new <code>AclProperty</code> from the given ACEs.
*
* @see AclProperty#createGrantAce(Principal, Privilege[], boolean, boolean, AclResource) for a factory method to create a grant ACE.
* @see AclProperty#createDenyAce(Principal, Privilege[], boolean, boolean, AclResource) for a factory method to create a deny ACE.
*/
public AclProperty(Ace[] accessControlElements) {
this((accessControlElements == null) ? new ArrayList<Ace>() : Arrays.asList(accessControlElements));
}
private AclProperty(List<Ace> aces) {
super(SecurityConstants.ACL, true);
this.aces = aces;
}
/**
* @return a List of <code>Ace</code> object. If this property defines no ACEs
* an empty list is returned.
* @see DavProperty#getValue()
*/
public List<Ace> getValue() {
return aces;
}
/**
* Build a new <code>AclProperty</code> object from the request body of the
* ACL method call.
*
* @param aclElement
* @return new <code>AclProperty</code>
* @throws DavException
*/
public static AclProperty createFromXml(Element aclElement) throws DavException {
if (!DomUtil.matches(aclElement, SecurityConstants.ACL.getName(), SecurityConstants.ACL.getNamespace())) {
throw new DavException(DavServletResponse.SC_BAD_REQUEST, "ACL request requires a DAV:acl body.");
}
List<Ace> aces = new ArrayList<Ace>();
ElementIterator it = DomUtil.getChildren(aclElement, Ace.XML_ACE, SecurityConstants.NAMESPACE);
while (it.hasNext()) {
Element aceElem = it.nextElement();
aces.add(Ace.createFromXml(aceElem));
}
return new AclProperty(aces);
}
public static Ace createGrantAce(Principal principal, Privilege[] privileges, boolean invert, boolean isProtected, AclResource inheritedFrom) {
return new Ace(principal, invert, privileges, true, isProtected, inheritedFrom);
}
public static Ace createDenyAce(Principal principal, Privilege[] privileges, boolean invert, boolean isProtected, AclResource inheritedFrom) {
return new Ace(principal, invert, privileges, false, isProtected, inheritedFrom);
}
//--------------------------------------------------------< inner class >---
/**
* Simple WebDAV ACE implementation
*/
public static class Ace implements XmlSerializable, SecurityConstants {
private static final String XML_ACE = "ace";
private static final String XML_INVERT = "invert";
private static final String XML_GRANT = "grant";
private static final String XML_DENY = "deny";
private static final String XML_PROTECTED = "protected";
private static final String XML_INHERITED = "inherited";
private final Principal principal;
private final boolean invert;
private final Privilege[] privileges;
private final boolean grant;
private final boolean isProtected;
private final String inheritedHref;
/**
* Private constructor
*
* @param principal
* @param invert
* @param privileges
* @param grant
* @param isProtected
* @param inherited
*/
private Ace(Principal principal, boolean invert, Privilege[] privileges,
boolean grant, boolean isProtected, AclResource inherited) {
this(principal, invert, privileges, grant, isProtected,
((inherited != null) ? inherited.getHref() : null));
}
/**
* Private constructor
*
* @param principal
* @param invert
* @param privileges
* @param grant
* @param isProtected
* @param inheritedHref
*/
private Ace(Principal principal, boolean invert, Privilege[] privileges,
boolean grant, boolean isProtected, String inheritedHref) {
if (principal == null) {
throw new IllegalArgumentException("Cannot create a new ACE with 'null' principal.");
}
if (privileges == null || privileges.length == 0) {
throw new IllegalArgumentException("Cannot create a new ACE: at least a single privilege must be specified.");
}
this.principal = principal;
this.invert = invert;
this.privileges = privileges;
this.grant = grant;
this.isProtected = isProtected;
this.inheritedHref = inheritedHref;
}
public Principal getPrincipal() {
return principal;
}
public boolean isInvert() {
return invert;
}
public Privilege[] getPrivileges() {
return privileges;
}
public boolean isGrant() {
return grant;
}
public boolean isDeny() {
return !grant;
}
public boolean isProtected() {
return isProtected;
}
public String getInheritedHref() {
return inheritedHref;
}
/**
* @see XmlSerializable#toXml(Document)
*/
public Element toXml(Document document) {
Element ace = DomUtil.createElement(document, XML_ACE, SecurityConstants.NAMESPACE);
if (invert) {
Element inv = DomUtil.addChildElement(ace, XML_INVERT, SecurityConstants.NAMESPACE);
inv.appendChild(principal.toXml(document));
} else {
ace.appendChild(principal.toXml(document));
}
Element gd = DomUtil.addChildElement(ace, ((grant) ? XML_GRANT : XML_DENY), SecurityConstants.NAMESPACE);
for (Privilege privilege : privileges) {
gd.appendChild(privilege.toXml(document));
}
if (isProtected) {
DomUtil.addChildElement(ace, XML_PROTECTED, SecurityConstants.NAMESPACE);
}
if (inheritedHref != null) {
Element inh = DomUtil.addChildElement(ace, XML_INHERITED, SecurityConstants.NAMESPACE);
inh.appendChild(DomUtil.hrefToXml(inheritedHref, document));
}
return ace;
}
private static Ace createFromXml(Element aceElement) throws DavException {
boolean invert = DomUtil.hasChildElement(aceElement, XML_INVERT, NAMESPACE);
Element pe;
if (invert) {
Element invertE = DomUtil.getChildElement(aceElement, XML_INVERT, NAMESPACE);
pe = DomUtil.getChildElement(invertE, Principal.XML_PRINCIPAL, NAMESPACE);
} else {
pe = DomUtil.getChildElement(aceElement, Principal.XML_PRINCIPAL, SecurityConstants.NAMESPACE);
}
Principal principal = Principal.createFromXml(pe);
boolean grant = DomUtil.hasChildElement(aceElement, Ace.XML_GRANT, SecurityConstants.NAMESPACE);
Element gdElem;
if (grant) {
gdElem = DomUtil.getChildElement(aceElement, XML_GRANT, NAMESPACE);
} else {
gdElem = DomUtil.getChildElement(aceElement, XML_DENY, NAMESPACE);
}
List<Privilege> privilegeList = new ArrayList<Privilege>();
ElementIterator privIt = DomUtil.getChildren(gdElem, Privilege.XML_PRIVILEGE, NAMESPACE);
while (privIt.hasNext()) {
Privilege pv = Privilege.getPrivilege(privIt.nextElement());
privilegeList.add(pv);
}
Privilege[] privileges = privilegeList.toArray(new Privilege[privilegeList.size()]);
boolean isProtected = DomUtil.hasChildElement(aceElement, XML_PROTECTED, NAMESPACE);
String inheritedHref = null;
if (DomUtil.hasChildElement(aceElement, XML_INHERITED, NAMESPACE)) {
Element inhE = DomUtil.getChildElement(aceElement, XML_INHERITED, NAMESPACE);
inheritedHref = DomUtil.getChildText(inhE, DavConstants.XML_HREF, DavConstants.NAMESPACE);
}
Ace ace = new Ace(principal, invert, privileges, grant, isProtected, inheritedHref);
return ace;
}
}
}