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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: bojilova $'
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* '$Date: 2001-01-09 17:37:56 -0800 (Tue, 09 Jan 2001) $'
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* '$Revision: 652 $'
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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 resourceURL;
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private String resourceId;
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private Vector principalName;
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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.principalName = 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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/**
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* Set up the SAX parser for reading the XML serialized ACL
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*/
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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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resourceURL = inputString;
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resourceId = getDocid(inputString);
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// check permissions for @user on resourceId first
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// @user must have permission "all" on resourceId
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boolean hasPermission = false;
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try {
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hasPermission = hasPermission("ALL",user,resourceId);
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if ( !hasPermission && group != null ) {
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hasPermission = hasPermission("ALL",group,resourceId);
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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 " + resourceId);
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}
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// end of check for "all" perm on resourceId
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} else if (currentTag.equals("principalName")) {
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principalName.addElement(new String(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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}
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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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ticketCount = (new Integer(inputString.trim())).intValue();
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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 @resourceId
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if ( aclid != null ) {
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insertRelation(aclid, resourceURL);
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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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282
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} else if ( leaving.getTagName().equals("allow") ) {
|
283
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|
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if ( permission > 0 ) {
|
285
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// insert into db calculated permission for the list of principals
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try {
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288
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insertPermissions("allowed");
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} catch (SQLException sqle) {
|
290
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throw new SAXException(sqle);
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291
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}
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292
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}
|
293
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294
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// reset the allowed permission
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295
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principalName = new Vector();
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296
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permission = 0;
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beginTime = null;
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endTime = null;
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299
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ticketCount = 0;
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300
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301
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} else if ( leaving.getTagName().equals("deny") ) {
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302
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303
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if ( permission > 0 ) {
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304
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305
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// insert into db calculated permission for the list of principals
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306
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try {
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307
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insertPermissions("denied");
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308
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} catch (SQLException sqle) {
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309
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throw new SAXException(sqle);
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310
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}
|
311
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}
|
312
|
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313
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// reset the denied permission
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314
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principalName = new Vector();
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315
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permission = 0;
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316
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beginTime = null;
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317
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endTime = null;
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318
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ticketCount = 0;
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319
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320
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} else if ( leaving.getTagName().equals("resource") ) {
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321
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// reset the resource identifier
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322
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resourceId = null;
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323
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permOrder = null;
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324
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}
|
325
|
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326
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}
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327
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328
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/** SAX Handler that receives notification of DOCTYPE. Sets the DTD */
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329
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public void startDTD(String name, String publicId, String systemId)
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330
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throws SAXException {
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331
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docname = name;
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332
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doctype = publicId;
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333
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systemid = systemId;
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334
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// processingDTD = true;
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335
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}
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336
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337
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/**
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338
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* SAX Handler that receives notification of the start of entities
|
339
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*/
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340
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public void startEntity(String name) throws SAXException {
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341
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if (name.equals("[dtd]")) {
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342
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processingDTD = true;
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343
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}
|
344
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}
|
345
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346
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/**
|
347
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* SAX Handler that receives notification of the end of entities
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348
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*/
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349
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public void endEntity(String name) throws SAXException {
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350
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if (name.equals("[dtd]")) {
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351
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processingDTD = false;
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352
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}
|
353
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}
|
354
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|
355
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/**
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356
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* get the document name
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357
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*/
|
358
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public String getDocname() {
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359
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return docname;
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360
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}
|
361
|
|
362
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/**
|
363
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* get the document processing state
|
364
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*/
|
365
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public boolean processingDTD() {
|
366
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return processingDTD;
|
367
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}
|
368
|
|
369
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/** Delete from db all permission for resources related to @aclid if any */
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370
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private void deletePermissionsForRelatedResources(String aclid)
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371
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throws SQLException
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372
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{
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373
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// delete all acl records for resources related to @aclid if any
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374
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Statement stmt = conn.createStatement();
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375
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stmt.execute("DELETE FROM xml_access WHERE accessfileid = '" + aclid + "'");
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376
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stmt.close();
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377
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}
|
378
|
|
379
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/**
|
380
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* Deletes all of the relations with a docid of @docid.
|
381
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* @param docid the docid to delete.
|
382
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*/
|
383
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public void deleteRelations(String docid)
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384
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throws SQLException
|
385
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{
|
386
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Statement stmt = conn.createStatement();
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387
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stmt.execute("DELETE FROM xml_relation WHERE docid='" + docid + "'");
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388
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stmt.close();
|
389
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}
|
390
|
|
391
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/** Insert relationship into db for @aclid on @resourceURL */
|
392
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private void insertRelation(String aclid, String resourceURL)
|
393
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throws SQLException
|
394
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{
|
395
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String aclURL = "metacat://" + server + "/?docid=" + aclid;
|
396
|
|
397
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// insert relationship
|
398
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PreparedStatement pstmt;
|
399
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pstmt = conn.prepareStatement(
|
400
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"INSERT INTO xml_relation (docid,subject,relationship,object) " +
|
401
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"VALUES (?, ?, ?, ?)");
|
402
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pstmt.setString(1, aclid);
|
403
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pstmt.setString(2, aclURL);
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404
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pstmt.setString(3, "isaclfor");
|
405
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pstmt.setString(4, resourceURL);
|
406
|
|
407
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pstmt.execute();
|
408
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pstmt.close();
|
409
|
}
|
410
|
|
411
|
/** Insert into db calculated permission for the list of principals */
|
412
|
private void insertPermissions( String permType )
|
413
|
throws SQLException
|
414
|
{
|
415
|
PreparedStatement pstmt;
|
416
|
|
417
|
try {
|
418
|
pstmt = conn.prepareStatement(
|
419
|
"INSERT INTO xml_access " +
|
420
|
"(docid, principal_name, permission, perm_type, perm_order," +
|
421
|
"begin_time,end_time,ticket_count, accessfileid) VALUES " +
|
422
|
"(?,?,?,?,?,to_date(?,'mm/dd/yy'),to_date(?,'mm/dd/yy'),?,?)");
|
423
|
// Bind the values to the query
|
424
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pstmt.setString(1, resourceId);
|
425
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pstmt.setInt(3, permission);
|
426
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pstmt.setString(4, permType);
|
427
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pstmt.setString(5, permOrder);
|
428
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pstmt.setString(6, beginTime);
|
429
|
pstmt.setString(7, endTime);
|
430
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pstmt.setString(9, aclid);
|
431
|
if ( ticketCount > 0 ) {
|
432
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pstmt.setString(8, "" + ticketCount);
|
433
|
} else {
|
434
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pstmt.setString(8, "");
|
435
|
}
|
436
|
for ( int i = 0; i < principalName.size(); i++ ) {
|
437
|
pstmt.setString(2, (String)principalName.elementAt(i));
|
438
|
pstmt.execute();
|
439
|
}
|
440
|
|
441
|
} catch (SQLException e) {
|
442
|
throw new
|
443
|
SQLException("AccessControlList.insertPermissions(): " + e.getMessage());
|
444
|
}
|
445
|
}
|
446
|
|
447
|
/** Check for @permission for @principal on @resourceId from db connection */
|
448
|
public boolean hasPermission ( String permission,
|
449
|
String principal, String resourceId )
|
450
|
throws SQLException
|
451
|
{
|
452
|
PreparedStatement pstmt;
|
453
|
// check public access to @resourceId from xml_documents table
|
454
|
if ( permission.equals("READ") ) {
|
455
|
try {
|
456
|
pstmt = conn.prepareStatement(
|
457
|
"SELECT 'x' FROM xml_documents " +
|
458
|
"WHERE docid LIKE ? AND public_access = 1");
|
459
|
// Bind the values to the query
|
460
|
pstmt.setString(1, resourceId);
|
461
|
|
462
|
pstmt.execute();
|
463
|
ResultSet rs = pstmt.getResultSet();
|
464
|
boolean hasRow = rs.next();
|
465
|
pstmt.close();
|
466
|
if (hasRow) {
|
467
|
return true;
|
468
|
}
|
469
|
//System.out.println("Passed the check for public access");
|
470
|
|
471
|
} catch (SQLException e) {
|
472
|
throw new
|
473
|
SQLException("Error checking document's public access: "
|
474
|
+ e.getMessage());
|
475
|
}
|
476
|
}
|
477
|
|
478
|
// since owner of resource has all permission on it,
|
479
|
// check if @principal is owner of @resourceId in xml_documents table
|
480
|
if ( principal != null ) {
|
481
|
try {
|
482
|
pstmt = conn.prepareStatement(
|
483
|
"SELECT 'x' FROM xml_documents " +
|
484
|
"WHERE docid LIKE ? AND user_owner LIKE ?");
|
485
|
// Bind the values to the query
|
486
|
pstmt.setString(1, resourceId);
|
487
|
pstmt.setString(2, principal);
|
488
|
|
489
|
pstmt.execute();
|
490
|
ResultSet rs = pstmt.getResultSet();
|
491
|
boolean hasRow = rs.next();
|
492
|
pstmt.close();
|
493
|
if (hasRow) {
|
494
|
return true;
|
495
|
}
|
496
|
//System.out.println("Passed the check for ownership");
|
497
|
|
498
|
} catch (SQLException e) {
|
499
|
throw new
|
500
|
SQLException("AccessControlList.hasPermission(): " +
|
501
|
"Error checking document's ownership. " + e.getMessage());
|
502
|
}
|
503
|
|
504
|
// check @principal's @permission on @resourceId from xml_access table
|
505
|
int accessValue = 0;
|
506
|
int ticketCount = 0;
|
507
|
String permOrder = "";
|
508
|
try {
|
509
|
pstmt = conn.prepareStatement(
|
510
|
"SELECT permission, perm_order, ticket_count " +
|
511
|
"FROM xml_access " +
|
512
|
"WHERE docid LIKE ? " +
|
513
|
"AND principal_name LIKE ? " +
|
514
|
"AND sysdate BETWEEN nvl(begin_time,sysdate) " +
|
515
|
"AND nvl(end_time,sysdate) " +
|
516
|
"AND perm_type LIKE ?");
|
517
|
// check if it is "denied" first
|
518
|
// Bind the values to the query
|
519
|
pstmt.setString(1, resourceId);
|
520
|
pstmt.setString(2, principal);
|
521
|
pstmt.setString(3, "denied");
|
522
|
|
523
|
pstmt.execute();
|
524
|
ResultSet rs = pstmt.getResultSet();
|
525
|
boolean hasRows = rs.next();
|
526
|
while ( hasRows ) {
|
527
|
accessValue = rs.getInt(1);
|
528
|
permOrder = rs.getString(2);
|
529
|
ticketCount = rs.getInt(3);
|
530
|
if ( ( accessValue & intValue(permission) ) == intValue(permission) &&
|
531
|
( permOrder.equals("allowFirst") ) &&
|
532
|
( rs.wasNull() || ticketCount > 0 ) ) {
|
533
|
if ( !rs.wasNull() && ticketCount > 0 ) {
|
534
|
decreaseNumberOfAccess(accessValue,principal,resourceId,"denied");
|
535
|
}
|
536
|
pstmt.close();
|
537
|
return false;
|
538
|
}
|
539
|
hasRows = rs.next();
|
540
|
}
|
541
|
//System.out.println("Passed the check for denied access");
|
542
|
|
543
|
// it is not denied then check if it is "allowed"
|
544
|
// Bind the values to the query
|
545
|
pstmt.setString(1, resourceId);
|
546
|
pstmt.setString(2, principal);
|
547
|
pstmt.setString(3, "allowed");
|
548
|
|
549
|
pstmt.execute();
|
550
|
rs = pstmt.getResultSet();
|
551
|
hasRows = rs.next();
|
552
|
while ( hasRows ) {
|
553
|
accessValue = rs.getInt(1);
|
554
|
ticketCount = rs.getInt(3);
|
555
|
if ( ( accessValue & intValue(permission) )==intValue(permission) &&
|
556
|
( rs.wasNull() || ticketCount > 0 ) ) {
|
557
|
if ( !rs.wasNull() && ticketCount > 0 ) {
|
558
|
decreaseNumberOfAccess(accessValue,principal,resourceId,"allowed");
|
559
|
}
|
560
|
pstmt.close();
|
561
|
return true;
|
562
|
}
|
563
|
hasRows = rs.next();
|
564
|
}
|
565
|
//System.out.println("Passed the check for allowed access");
|
566
|
|
567
|
// ???
|
568
|
// here there could be a check for the group's permission like
|
569
|
// selfrecursive call to hasPermission(conn,permission,group,recourceId)
|
570
|
//
|
571
|
|
572
|
pstmt.close();
|
573
|
return false;
|
574
|
|
575
|
} catch (SQLException e) {
|
576
|
throw new
|
577
|
SQLException("AccessControlList.hasPermission(): " +
|
578
|
"Error checking document's permission. " + e.getMessage());
|
579
|
}
|
580
|
}
|
581
|
|
582
|
return false;
|
583
|
}
|
584
|
|
585
|
/** decrease the number of access to @resourceId for @principal */
|
586
|
private void decreaseNumberOfAccess(int permission, String principal,
|
587
|
String resourceId, String permType)
|
588
|
throws SQLException
|
589
|
{
|
590
|
PreparedStatement pstmt;
|
591
|
pstmt = conn.prepareStatement(
|
592
|
"UPDATE xml_access SET ticket_count = ticket_count - 1 " +
|
593
|
"WHERE docid LIKE ? " +
|
594
|
"AND principal_name LIKE ? " +
|
595
|
"AND permission LIKE ? " +
|
596
|
"AND sysdate BETWEEN nvl(begin_time,sysdate) " +
|
597
|
"AND nvl(end_time,sysdate) " +
|
598
|
"AND perm_type LIKE ?");
|
599
|
// Bind the values to the query
|
600
|
pstmt.setString(1, resourceId);
|
601
|
pstmt.setString(2, principal);
|
602
|
pstmt.setInt(3, permission);
|
603
|
pstmt.setString(4, permType);
|
604
|
|
605
|
pstmt.execute();
|
606
|
pstmt.close();
|
607
|
}
|
608
|
|
609
|
// get the int value of READ, WRITE or ALL
|
610
|
private int intValue ( String permission )
|
611
|
{
|
612
|
if ( permission.equals("READ") ) {
|
613
|
return READ;
|
614
|
} else if ( permission.equals("WRITE") ) {
|
615
|
return WRITE;
|
616
|
} else if ( permission.equals("ALL") ) {
|
617
|
return ALL;
|
618
|
}
|
619
|
|
620
|
return -1;
|
621
|
}
|
622
|
|
623
|
// get docid from @url
|
624
|
private String getDocid ( String url ) throws SAXException
|
625
|
{
|
626
|
MetaCatUtil util = new MetaCatUtil();
|
627
|
try {
|
628
|
URL urlobj = new URL(url);
|
629
|
Hashtable urlParams = util.parseQuery(urlobj.getQuery());
|
630
|
if ( urlParams.containsKey("docid") ) {
|
631
|
return (String)urlParams.get("docid"); // return the docid value
|
632
|
} else {
|
633
|
throw new
|
634
|
SAXException("\"docid\" not specified within " + url);
|
635
|
}
|
636
|
} catch (MalformedURLException e) {
|
637
|
throw new SAXException(e.getMessage());
|
638
|
}
|
639
|
}
|
640
|
|
641
|
}
|