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/**
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* '$RCSfile$'
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* Purpose: A Class that loads eml-access.xml file containing ACL
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* for a metadata document into relational DB
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* Copyright: 2000 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* Authors: Jivka Bojilova
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* Release: @release@
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*
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* '$Author: jones $'
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* '$Date: 2001-01-18 11:52:00 -0800 (Thu, 18 Jan 2001) $'
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* '$Revision: 669 $'
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.metacat;
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import java.io.*;
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import java.sql.*;
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import java.util.Stack;
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import java.util.Vector;
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import java.util.Hashtable;
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import java.net.URL;
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import java.net.MalformedURLException;
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import org.xml.sax.Attributes;
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import org.xml.sax.InputSource;
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import org.xml.sax.ContentHandler;
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import org.xml.sax.EntityResolver;
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import org.xml.sax.ErrorHandler;
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import org.xml.sax.SAXException;
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import org.xml.sax.SAXParseException;
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import org.xml.sax.XMLReader;
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import org.xml.sax.helpers.XMLReaderFactory;
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import org.xml.sax.helpers.DefaultHandler;
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/**
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* A Class that loads eml-access.xml file containing ACL for a metadata
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* document into relational DB. It extends DefaultHandler class to handle
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* SAX parsing events when processing the XML stream.
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*/
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public class AccessControlList extends DefaultHandler {
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static final int ALL = 1;
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static final int WRITE = 2;
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static final int READ = 4;
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private Connection conn;
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private String parserName;
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private Stack elementStack;
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private String server;
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private boolean processingDTD;
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private String user;
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private String group;
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private String aclid;
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private String docname;
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private String doctype;
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private String systemid;
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private String docurl;
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private Vector resourceURL;
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private Vector resourceID;
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private Vector principal;
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private int permission;
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private String permType;
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private String permOrder;
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private String beginTime;
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private String endTime;
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private int ticketCount;
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/**
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* Construct an instance of the AccessControlList class.
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* It is used by the permission check up from DBQuery and DocumentImpl
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*
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* @param conn the JDBC connection where acl data are loaded
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*/
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public AccessControlList ( Connection conn ) throws SQLException
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{
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this.conn = conn;
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}
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/**
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* Construct an instance of the AccessControlList class.
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* It parse acl file and loads acl data into db connection.
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*
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* @param conn the JDBC connection where acl data are loaded
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* @param docid the Accession# of the document with the acl data
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* @param acl the acl file containing acl data
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*/
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public AccessControlList(Connection conn, String aclid, Reader acl,
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String user, String group)
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throws SAXException, IOException, ClassNotFoundException
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{
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// Get an instance of the parser
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MetaCatUtil util = new MetaCatUtil();
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String parserName = util.getOption("saxparser");
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this.server = util.getOption("server");
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this.conn = conn;
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this.parserName = parserName;
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this.processingDTD = false;
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this.elementStack = new Stack();
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this.user = user;
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this.group = group;
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this.aclid = aclid;
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this.resourceURL = new Vector();
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this.resourceID = new Vector();
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this.principal = new Vector();
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this.permission = 0;
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this.ticketCount = 0;
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// Initialize the parser and read the queryspec
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XMLReader parser = initializeParser();
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parser.parse(new InputSource(acl));
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}
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/**
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* Construct an instance of the AccessControlList class.
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* It parse acl file and loads acl data into db connection.
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*
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* @param conn the JDBC connection where acl data are loaded
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* @param docid the Accession# of the document with the acl data
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* @param aclfilename the name of acl file containing acl data
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*/
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public AccessControlList( Connection conn, String aclid, String aclfilename,
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String user, String group )
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throws SAXException, IOException, ClassNotFoundException
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{
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this(conn, aclid, new FileReader(new File(aclfilename).toString()),
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user, group);
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}
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/* Set up the SAX parser for reading the XML serialized ACL */
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private XMLReader initializeParser() throws SAXException
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{
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XMLReader parser = null;
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// Get an instance of the parser
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parser = XMLReaderFactory.createXMLReader(parserName);
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// Turn off validation
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parser.setFeature("http://xml.org/sax/features/validation", true);
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// Set Handlers in the parser
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// Set the ContentHandler to this instance
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parser.setContentHandler((ContentHandler)this);
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// make a DBEntityResolver instance
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// Set the EntityReslover to DBEntityResolver instance
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EntityResolver eresolver = new DBEntityResolver(conn,this,null);
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parser.setEntityResolver((EntityResolver)eresolver);
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// Set the ErrorHandler to this instance
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parser.setErrorHandler((ErrorHandler)this);
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return parser;
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}
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/**
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* callback method used by the SAX Parser when beginning of the document
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*/
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public void startDocument() throws SAXException
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{
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//delete all previously submitted permissions @ relations
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//this happens only on UPDATE of the access file
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try {
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if ( aclid != null ) {
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//first delete all permissions for resources related to @aclid if any
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deletePermissionsForRelatedResources(aclid);
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//then delete all relations with docid of @aclid if any
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deleteRelations(aclid);
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}
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} catch (SQLException sqle) {
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throw new SAXException(sqle);
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}
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}
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/**
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* callback method used by the SAX Parser when the start tag of an
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* element is detected. Used in this context to parse and store
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* the acl information in class variables.
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*/
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public void startElement (String uri, String localName,
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String qName, Attributes atts)
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throws SAXException
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{
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BasicNode currentNode = new BasicNode(localName);
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if (atts != null) {
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int len = atts.getLength();
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for (int i = 0; i < len; i++) {
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currentNode.setAttribute(atts.getLocalName(i), atts.getValue(i));
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}
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}
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if ( currentNode.getTagName().equals("resource") ) {
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permOrder = currentNode.getAttribute("order");
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}
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elementStack.push(currentNode);
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}
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/**
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* callback method used by the SAX Parser when the text sequences of an
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* xml stream are detected. Used in this context to parse and store
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* the acl information in class variables.
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*/
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public void characters(char ch[], int start, int length)
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throws SAXException
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{
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String inputString = new String(ch, start, length);
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BasicNode currentNode = (BasicNode)elementStack.peek();
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String currentTag = currentNode.getTagName();
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if (currentTag.equals("resourceIdentifier")) {
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// docid of the current resource
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String docid = getDocid(inputString);
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// URL string of the current resource
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// docurl is declared in the class
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try {
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docurl = (new URL(inputString)).toString();
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} catch (MalformedURLException murle) {
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throw new SAXException(murle.getMessage());
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}
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// collect them in Vector variables
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resourceID.addElement(docid);
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resourceURL.addElement(docurl);
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// check permissions for @user on the current resource first
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// @user must have permission "all" on it(docid)
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boolean hasPermission = false;
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try {
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hasPermission = hasPermission("ALL",user,docid);
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if ( !hasPermission && group != null ) {
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hasPermission = hasPermission("ALL",group,docid);
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}
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} catch (SQLException e) {
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throw new SAXException(e.getMessage());
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}
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if ( !hasPermission ) {
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throw new SAXException(
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"Permission denied for setting access control on " + docid);
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}
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// end of check for "all" perm on docid
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} else if (currentTag.equals("principal")) {
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principal.addElement(inputString);
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} else if (currentTag.equals("permission")) {
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if ( inputString.trim().toUpperCase().equals("READ") ) {
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permission = permission | READ;
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} else if ( inputString.trim().toUpperCase().equals("WRITE") ) {
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permission = permission | WRITE;
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} else if ( inputString.trim().toUpperCase().equals("ALL") ) {
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permission = permission | ALL;
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} else {
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throw new SAXException("Unknown permission type: " + inputString);
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}
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} else if (currentTag.equals("duration") &&
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beginTime == null && endTime == null ) {
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try {
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beginTime = inputString.substring(0, inputString.indexOf(" "));
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endTime = inputString.substring(inputString.indexOf(" ")+1);
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} catch (StringIndexOutOfBoundsException se) {
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beginTime = inputString;
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}
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} else if (currentTag.equals("ticketCount") && ticketCount == 0 ) {
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try {
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ticketCount = (new Integer(inputString.trim())).intValue();
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} catch (NumberFormatException nfe) {
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throw new SAXException("Wrong integer format for:" + inputString);
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}
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}
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}
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/**
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* callback method used by the SAX Parser when the end tag of an
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* element is detected. Used in this context to parse and store
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* the acl information in class variables.
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*/
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public void endElement (String uri, String localName, String qName)
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throws SAXException
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{
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BasicNode leaving = (BasicNode)elementStack.pop();
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if ( leaving.getTagName().equals("resourceIdentifier") ) {
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try {
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// make a relationship for @aclid on the current resource(docurl)
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if ( aclid != null ) {
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insertRelation(aclid, docurl);
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}
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} catch (SQLException sqle) {
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throw new SAXException(sqle);
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}
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} else if ( leaving.getTagName().equals("allow") ) {
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if ( permission > 0 ) {
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// insert into db calculated permission for the list of principals
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try {
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insertPermissions("allowed");
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} catch (SQLException sqle) {
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throw new SAXException(sqle);
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}
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}
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// reset the allowed permission
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principal = new Vector();
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permission = 0;
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beginTime = null;
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endTime = null;
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ticketCount = 0;
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} else if ( leaving.getTagName().equals("deny") ) {
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if ( permission > 0 ) {
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// insert into db calculated permission for the list of principals
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try {
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insertPermissions("denied");
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} catch (SQLException sqle) {
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throw new SAXException(sqle);
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}
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}
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// reset the denied permission
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principal = new Vector();
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permission = 0;
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beginTime = null;
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endTime = null;
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ticketCount = 0;
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} else if ( leaving.getTagName().equals("resource") ) {
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// reset the resource identifier
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resourceID = new Vector();
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resourceURL = new Vector();
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permOrder = null;
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}
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}
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/** SAX Handler that receives notification of DOCTYPE. Sets the DTD */
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public void startDTD(String name, String publicId, String systemId)
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throws SAXException {
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docname = name;
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doctype = publicId;
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systemid = systemId;
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// processingDTD = true;
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}
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369
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/**
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* SAX Handler that receives notification of the start of entities
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*/
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public void startEntity(String name) throws SAXException {
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if (name.equals("[dtd]")) {
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processingDTD = true;
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}
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}
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377
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378
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/**
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379
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* SAX Handler that receives notification of the end of entities
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380
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*/
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381
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public void endEntity(String name) throws SAXException {
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382
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if (name.equals("[dtd]")) {
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processingDTD = false;
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384
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}
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385
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}
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386
|
|
387
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/**
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388
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* get the document name
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389
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*/
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390
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public String getDocname() {
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391
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return docname;
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392
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}
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393
|
|
394
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/**
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395
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* get the document processing state
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396
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*/
|
397
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public boolean processingDTD() {
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398
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return processingDTD;
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399
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}
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400
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|
401
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/** Delete from db all permission for resources related to @aclid if any */
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private void deletePermissionsForRelatedResources(String aclid)
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throws SQLException
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{
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// delete all acl records for resources related to @aclid if any
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Statement stmt = conn.createStatement();
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stmt.execute("DELETE FROM xml_access WHERE accessfileid = '" + aclid + "'");
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408
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stmt.close();
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409
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}
|
410
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|
411
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/**
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412
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* Deletes all of the relations with a docid of @docid.
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413
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* @param docid the docid to delete.
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414
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*/
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415
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public void deleteRelations(String docid)
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416
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throws SQLException
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417
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{
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418
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Statement stmt = conn.createStatement();
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419
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stmt.execute("DELETE FROM xml_relation WHERE docid='" + docid + "'");
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stmt.close();
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}
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422
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|
423
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/** Insert relationship into db for @aclid on @resourceURL */
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424
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private void insertRelation(String aclid, String resourceURL)
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425
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throws SQLException
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426
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{
|
427
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String aclURL = "metacat://" + server + "/?docid=" + aclid;
|
428
|
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429
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// insert relationship
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430
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PreparedStatement pstmt;
|
431
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pstmt = conn.prepareStatement(
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432
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"INSERT INTO xml_relation (docid,subject,relationship,object) " +
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"VALUES (?, ?, ?, ?)");
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434
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pstmt.setString(1, aclid);
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435
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pstmt.setString(2, aclURL);
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436
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pstmt.setString(3, "isaclfor");
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pstmt.setString(4, resourceURL);
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438
|
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439
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pstmt.execute();
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440
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pstmt.close();
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441
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}
|
442
|
|
443
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/** Insert into db calculated permission for the list of principals */
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444
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private void insertPermissions( String permType )
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445
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throws SQLException
|
446
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{
|
447
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PreparedStatement pstmt = null;
|
448
|
|
449
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try {
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450
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pstmt = conn.prepareStatement(
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451
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"INSERT INTO xml_access " +
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452
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"(docid, principal_name, permission, perm_type, perm_order," +
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453
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"begin_time,end_time,ticket_count, accessfileid) VALUES " +
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454
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"(?,?,?,?,?,to_date(?,'mm/dd/yy'),to_date(?,'mm/dd/yy'),?,?)");
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455
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// Bind the values to the query
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456
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pstmt.setInt(3, permission);
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457
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pstmt.setString(4, permType);
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458
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pstmt.setString(5, permOrder);
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459
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pstmt.setString(6, beginTime);
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460
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pstmt.setString(7, endTime);
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461
|
pstmt.setString(9, aclid);
|
462
|
if ( ticketCount > 0 ) {
|
463
|
pstmt.setString(8, "" + ticketCount);
|
464
|
} else {
|
465
|
pstmt.setString(8, "");
|
466
|
}
|
467
|
for ( int i = 0; i < resourceID.size(); i++ ) {
|
468
|
pstmt.setString(1, (String)resourceID.elementAt(i));
|
469
|
for ( int j = 0; j < principal.size(); j++ ) {
|
470
|
pstmt.setString(2, (String)principal.elementAt(j));
|
471
|
pstmt.execute();
|
472
|
}
|
473
|
}
|
474
|
|
475
|
} catch (SQLException e) {
|
476
|
throw new
|
477
|
SQLException("AccessControlList.insertPermissions(): " + e.getMessage());
|
478
|
} finally {
|
479
|
pstmt.close();
|
480
|
}
|
481
|
}
|
482
|
|
483
|
/** Check for @permission for @principal on @resourceID from db connection */
|
484
|
public boolean hasPermission ( String permission,
|
485
|
String principal, String resourceID )
|
486
|
throws SQLException
|
487
|
{
|
488
|
PreparedStatement pstmt;
|
489
|
// check public access to @resourceID from xml_documents table
|
490
|
if ( permission.equals("READ") ) {
|
491
|
try {
|
492
|
pstmt = conn.prepareStatement(
|
493
|
"SELECT 'x' FROM xml_documents " +
|
494
|
"WHERE docid LIKE ? AND public_access = 1");
|
495
|
// Bind the values to the query
|
496
|
pstmt.setString(1, resourceID);
|
497
|
|
498
|
pstmt.execute();
|
499
|
ResultSet rs = pstmt.getResultSet();
|
500
|
boolean hasRow = rs.next();
|
501
|
pstmt.close();
|
502
|
if (hasRow) {
|
503
|
return true;
|
504
|
}
|
505
|
//System.out.println("Passed the check for public access");
|
506
|
|
507
|
} catch (SQLException e) {
|
508
|
throw new
|
509
|
SQLException("Error checking document's public access: "
|
510
|
+ e.getMessage());
|
511
|
}
|
512
|
}
|
513
|
|
514
|
// since owner of resource has all permission on it,
|
515
|
// check if @principal is owner of @resourceID in xml_documents table
|
516
|
if ( principal != null ) {
|
517
|
try {
|
518
|
pstmt = conn.prepareStatement(
|
519
|
"SELECT 'x' FROM xml_documents " +
|
520
|
"WHERE docid LIKE ? AND user_owner LIKE ?");
|
521
|
// Bind the values to the query
|
522
|
pstmt.setString(1, resourceID);
|
523
|
pstmt.setString(2, principal);
|
524
|
|
525
|
pstmt.execute();
|
526
|
ResultSet rs = pstmt.getResultSet();
|
527
|
boolean hasRow = rs.next();
|
528
|
pstmt.close();
|
529
|
if (hasRow) {
|
530
|
return true;
|
531
|
}
|
532
|
//System.out.println("Passed the check for ownership");
|
533
|
|
534
|
} catch (SQLException e) {
|
535
|
throw new
|
536
|
SQLException("AccessControlList.hasPermission(): " +
|
537
|
"Error checking document's ownership. " + e.getMessage());
|
538
|
}
|
539
|
|
540
|
// check @principal's @permission on @resourceID from xml_access table
|
541
|
int accessValue = 0;
|
542
|
int ticketCount = 0;
|
543
|
String permOrder = "";
|
544
|
try {
|
545
|
pstmt = conn.prepareStatement(
|
546
|
"SELECT permission, perm_order, ticket_count " +
|
547
|
"FROM xml_access " +
|
548
|
"WHERE docid LIKE ? " +
|
549
|
"AND principal_name LIKE ? " +
|
550
|
"AND sysdate BETWEEN nvl(begin_time,sysdate) " +
|
551
|
"AND nvl(end_time,sysdate) " +
|
552
|
"AND perm_type LIKE ?");
|
553
|
// check if it is "denied" first
|
554
|
// Bind the values to the query
|
555
|
pstmt.setString(1, resourceID);
|
556
|
pstmt.setString(2, principal);
|
557
|
pstmt.setString(3, "denied");
|
558
|
|
559
|
pstmt.execute();
|
560
|
ResultSet rs = pstmt.getResultSet();
|
561
|
boolean hasRows = rs.next();
|
562
|
while ( hasRows ) {
|
563
|
accessValue = rs.getInt(1);
|
564
|
permOrder = rs.getString(2);
|
565
|
ticketCount = rs.getInt(3);
|
566
|
if ( ( accessValue & intValue(permission) ) == intValue(permission) &&
|
567
|
( permOrder.equals("allowFirst") ) &&
|
568
|
( rs.wasNull() || ticketCount > 0 ) ) {
|
569
|
if ( !rs.wasNull() && ticketCount > 0 ) {
|
570
|
decreaseNumberOfAccess(accessValue,principal,resourceID,"denied");
|
571
|
}
|
572
|
pstmt.close();
|
573
|
return false;
|
574
|
}
|
575
|
hasRows = rs.next();
|
576
|
}
|
577
|
//System.out.println("Passed the check for denied access");
|
578
|
|
579
|
// it is not denied then check if it is "allowed"
|
580
|
// Bind the values to the query
|
581
|
pstmt.setString(1, resourceID);
|
582
|
pstmt.setString(2, principal);
|
583
|
pstmt.setString(3, "allowed");
|
584
|
|
585
|
pstmt.execute();
|
586
|
rs = pstmt.getResultSet();
|
587
|
hasRows = rs.next();
|
588
|
while ( hasRows ) {
|
589
|
accessValue = rs.getInt(1);
|
590
|
ticketCount = rs.getInt(3);
|
591
|
if ( ( accessValue & intValue(permission) )==intValue(permission) &&
|
592
|
( rs.wasNull() || ticketCount > 0 ) ) {
|
593
|
if ( !rs.wasNull() && ticketCount > 0 ) {
|
594
|
decreaseNumberOfAccess(accessValue,principal,resourceID,"allowed");
|
595
|
}
|
596
|
pstmt.close();
|
597
|
return true;
|
598
|
}
|
599
|
hasRows = rs.next();
|
600
|
}
|
601
|
//System.out.println("Passed the check for allowed access");
|
602
|
|
603
|
// ???
|
604
|
// here there could be a check for the group's permission like
|
605
|
// selfrecursive call to hasPermission(conn,permission,group,recourceId)
|
606
|
//
|
607
|
|
608
|
pstmt.close();
|
609
|
return false;
|
610
|
|
611
|
} catch (SQLException e) {
|
612
|
throw new
|
613
|
SQLException("AccessControlList.hasPermission(): " +
|
614
|
"Error checking document's permission. " + e.getMessage());
|
615
|
}
|
616
|
}
|
617
|
|
618
|
return false;
|
619
|
}
|
620
|
|
621
|
/** decrease the number of access to @resourceID for @principal */
|
622
|
private void decreaseNumberOfAccess(int permission, String principal,
|
623
|
String resourceID, String permType)
|
624
|
throws SQLException
|
625
|
{
|
626
|
PreparedStatement pstmt;
|
627
|
pstmt = conn.prepareStatement(
|
628
|
"UPDATE xml_access SET ticket_count = ticket_count - 1 " +
|
629
|
"WHERE docid LIKE ? " +
|
630
|
"AND principal_name LIKE ? " +
|
631
|
"AND permission LIKE ? " +
|
632
|
"AND sysdate BETWEEN nvl(begin_time,sysdate) " +
|
633
|
"AND nvl(end_time,sysdate) " +
|
634
|
"AND perm_type LIKE ?");
|
635
|
// Bind the values to the query
|
636
|
pstmt.setString(1, resourceID);
|
637
|
pstmt.setString(2, principal);
|
638
|
pstmt.setInt(3, permission);
|
639
|
pstmt.setString(4, permType);
|
640
|
|
641
|
pstmt.execute();
|
642
|
pstmt.close();
|
643
|
}
|
644
|
|
645
|
// get the int value of READ, WRITE or ALL
|
646
|
private int intValue ( String permission )
|
647
|
{
|
648
|
if ( permission.equals("READ") ) {
|
649
|
return READ;
|
650
|
} else if ( permission.equals("WRITE") ) {
|
651
|
return WRITE;
|
652
|
} else if ( permission.equals("ALL") ) {
|
653
|
return ALL;
|
654
|
}
|
655
|
|
656
|
return -1;
|
657
|
}
|
658
|
|
659
|
// get docid from @url
|
660
|
private String getDocid ( String url ) throws SAXException
|
661
|
{
|
662
|
MetaCatUtil util = new MetaCatUtil();
|
663
|
try {
|
664
|
URL urlobj = new URL(url);
|
665
|
Hashtable urlParams = util.parseQuery(urlobj.getQuery());
|
666
|
if ( urlParams.containsKey("docid") ) {
|
667
|
return (String)urlParams.get("docid"); // return the docid value
|
668
|
} else {
|
669
|
throw new
|
670
|
SAXException("\"docid\" not specified within " + url);
|
671
|
}
|
672
|
} catch (MalformedURLException e) {
|
673
|
throw new SAXException(e.getMessage());
|
674
|
}
|
675
|
}
|
676
|
|
677
|
}
|