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The SnmpAcl.java Java example source code
/*
* Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
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*/
package com.sun.jmx.snmp.IPAcl;
// java import
//
import java.io.Serializable;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Hashtable;
import java.util.logging.Level;
import java.util.Vector;
import java.util.Enumeration;
import java.util.HashSet;
import java.security.acl.AclEntry;
import java.security.acl.NotOwnerException;
// SNMP Runtime import
//
import static com.sun.jmx.defaults.JmxProperties.SNMP_LOGGER;
import com.sun.jmx.snmp.InetAddressAcl;
/**
* Defines an implementation of the {@link com.sun.jmx.snmp.InetAddressAcl InetAddressAcl} interface.
* <p>
* In this implementation the ACL information is stored on a flat file and
* its default location is "$JRE/lib/snmp.acl" - See
* {@link #getDefaultAclFileName()}
* <p>
* <OL>
*
* <p>This API is a Sun Microsystems internal API and is subject
* to change without notice.</b>
*/
public class SnmpAcl implements InetAddressAcl, Serializable {
private static final long serialVersionUID = -6702287103824397063L;
static final PermissionImpl READ = new PermissionImpl("READ");
static final PermissionImpl WRITE = new PermissionImpl("WRITE");
/**
* Constructs the Java Dynamic Management(TM) Access Control List
* based on IP addresses. The ACL will take the given owner name.
* The current IP address will be the owner of the ACL.
*
* @param Owner The name of the ACL Owner.
*
* @exception UnknownHostException If the local host is unknown.
* @exception IllegalArgumentException If the ACL file doesn't exist.
*/
public SnmpAcl(String Owner)
throws UnknownHostException, IllegalArgumentException {
this(Owner,null);
}
/**
* Constructs the Java Dynamic Management(TM) Access Control List
* based on IP addresses. The ACL will take the given owner name.
* The current IP address will be the owner of the ACL.
*
* @param Owner The name of the ACL Owner.
* @param aclFileName The name of the ACL File.
*
* @exception UnknownHostException If the local host is unknown.
* @exception IllegalArgumentException If the ACL file doesn't exist.
*/
public SnmpAcl(String Owner, String aclFileName)
throws UnknownHostException, IllegalArgumentException {
trapDestList= new Hashtable<InetAddress, Vector();
informDestList= new Hashtable<InetAddress, Vector();
// PrincipalImpl() take the current host as entry
owner = new PrincipalImpl();
try {
acl = new AclImpl(owner,Owner);
AclEntry ownEntry = new AclEntryImpl(owner);
ownEntry.addPermission(READ);
ownEntry.addPermission(WRITE);
acl.addEntry(owner,ownEntry);
} catch (NotOwnerException ex) {
if (SNMP_LOGGER.isLoggable(Level.FINEST)) {
SNMP_LOGGER.logp(Level.FINEST, SnmpAcl.class.getName(),
"SnmpAcl(String,String)",
"Should never get NotOwnerException as the owner " +
"is built in this constructor");
}
}
if (aclFileName == null) setDefaultFileName();
else setAuthorizedListFile(aclFileName);
readAuthorizedListFile();
}
/**
* Returns an enumeration of the entries in this ACL. Each element in the
* enumeration is of type <CODE>java.security.acl.AclEntry.
*
* @return An enumeration of the entries in this ACL.
*/
public Enumeration<AclEntry> entries() {
return acl.entries();
}
/**
* Returns ann enumeration of community strings. Community strings are returned as String.
* @return The enumeration of community strings.
*/
public Enumeration<String> communities() {
HashSet<String> set = new HashSet();
Vector<String> res = new Vector();
for (Enumeration<AclEntry> e = acl.entries() ; e.hasMoreElements() ;) {
AclEntryImpl entry = (AclEntryImpl) e.nextElement();
for (Enumeration<String> cs = entry.communities();
cs.hasMoreElements() ;) {
set.add(cs.nextElement());
}
}
String[] objs = set.toArray(new String[0]);
for(int i = 0; i < objs.length; i++)
res.addElement(objs[i]);
return res.elements();
}
/**
* Returns the name of the ACL.
*
* @return The name of the ACL.
*/
public String getName() {
return acl.getName();
}
/**
* Returns the read permission instance used.
*
* @return The read permission instance.
*/
static public PermissionImpl getREAD() {
return READ;
}
/**
* Returns the write permission instance used.
*
* @return The write permission instance.
*/
static public PermissionImpl getWRITE() {
return WRITE;
}
/**
* Get the default name for the ACL file.
* In this implementation this is "$JRE/lib/snmp.acl"
* @return The default name for the ACL file.
**/
public static String getDefaultAclFileName() {
final String fileSeparator =
System.getProperty("file.separator");
final StringBuffer defaultAclName =
new StringBuffer(System.getProperty("java.home")).
append(fileSeparator).append("lib").append(fileSeparator).
append("snmp.acl");
return defaultAclName.toString();
}
/**
* Sets the full path of the file containing the ACL information.
*
* @param filename The full path of the file containing the ACL information.
* @throws IllegalArgumentException If the passed ACL file doesn't exist.
*/
public void setAuthorizedListFile(String filename)
throws IllegalArgumentException {
File file = new File(filename);
if (!file.isFile() ) {
if (SNMP_LOGGER.isLoggable(Level.FINEST)) {
SNMP_LOGGER.logp(Level.FINEST, SnmpAcl.class.getName(),
"setAuthorizedListFile", "ACL file not found: " + filename);
}
throw new
IllegalArgumentException("The specified file ["+file+"] "+
"doesn't exist or is not a file, "+
"no configuration loaded");
}
if (SNMP_LOGGER.isLoggable(Level.FINER)) {
SNMP_LOGGER.logp(Level.FINER, SnmpAcl.class.getName(),
"setAuthorizedListFile", "Default file set to " + filename);
}
authorizedListFile = filename;
}
/**
* Resets this ACL to the values contained in the configuration file.
*
* @exception NotOwnerException If the principal attempting the reset is not an owner of this ACL.
* @exception UnknownHostException If IP addresses for hosts contained in the ACL file couldn't be found.
*/
public void rereadTheFile() throws NotOwnerException, UnknownHostException {
alwaysAuthorized = false;
acl.removeAll(owner);
trapDestList.clear();
informDestList.clear();
AclEntry ownEntry = new AclEntryImpl(owner);
ownEntry.addPermission(READ);
ownEntry.addPermission(WRITE);
acl.addEntry(owner,ownEntry);
readAuthorizedListFile();
}
/**
* Returns the full path of the file used to get ACL information.
*
* @return The full path of the file used to get ACL information.
*/
public String getAuthorizedListFile() {
return authorizedListFile;
}
/**
* Checks whether or not the specified host has <CODE>READ access.
*
* @param address The host address to check.
*
* @return <CODE>true if the host has read permission, false otherwise.
*/
public boolean checkReadPermission(InetAddress address) {
if (alwaysAuthorized) return ( true );
PrincipalImpl p = new PrincipalImpl(address);
return acl.checkPermission(p, READ);
}
/**
* Checks whether or not the specified host and community have <CODE>READ access.
*
* @param address The host address to check.
* @param community The community associated with the host.
*
* @return <CODE>true if the pair (host, community) has read permission, false otherwise.
*/
public boolean checkReadPermission(InetAddress address, String community) {
if (alwaysAuthorized) return ( true );
PrincipalImpl p = new PrincipalImpl(address);
return acl.checkPermission(p, community, READ);
}
/**
* Checks whether or not a community string is defined.
*
* @param community The community to check.
*
* @return <CODE>true if the community is known, false otherwise.
*/
public boolean checkCommunity(String community) {
return acl.checkCommunity(community);
}
/**
* Checks whether or not the specified host has <CODE>WRITE access.
*
* @param address The host address to check.
*
* @return <CODE>true if the host has write permission, false otherwise.
*/
public boolean checkWritePermission(InetAddress address) {
if (alwaysAuthorized) return ( true );
PrincipalImpl p = new PrincipalImpl(address);
return acl.checkPermission(p, WRITE);
}
/**
* Checks whether or not the specified host and community have <CODE>WRITE access.
*
* @param address The host address to check.
* @param community The community associated with the host.
*
* @return <CODE>true if the pair (host, community) has write permission, false otherwise.
*/
public boolean checkWritePermission(InetAddress address, String community) {
if (alwaysAuthorized) return ( true );
PrincipalImpl p = new PrincipalImpl(address);
return acl.checkPermission(p, community, WRITE);
}
/**
* Returns an enumeration of trap destinations.
*
* @return An enumeration of the trap destinations (enumeration of <CODE>InetAddress).
*/
public Enumeration<InetAddress> getTrapDestinations() {
return trapDestList.keys();
}
/**
* Returns an enumeration of trap communities for a given host.
*
* @param i The address of the host.
*
* @return An enumeration of trap communities for a given host (enumeration of <CODE>String).
*/
public Enumeration<String> getTrapCommunities(InetAddress i) {
Vector<String> list = null;
if ((list = trapDestList.get(i)) != null ) {
if (SNMP_LOGGER.isLoggable(Level.FINER)) {
SNMP_LOGGER.logp(Level.FINER, SnmpAcl.class.getName(),
"getTrapCommunities", "["+i.toString()+"] is in list");
}
return list.elements();
} else {
list = new Vector<>();
if (SNMP_LOGGER.isLoggable(Level.FINER)) {
SNMP_LOGGER.logp(Level.FINER, SnmpAcl.class.getName(),
"getTrapCommunities", "["+i.toString()+"] is not in list");
}
return list.elements();
}
}
/**
* Returns an enumeration of inform destinations.
*
* @return An enumeration of the inform destinations (enumeration of <CODE>InetAddress).
*/
public Enumeration<InetAddress> getInformDestinations() {
return informDestList.keys();
}
/**
* Returns an enumeration of inform communities for a given host.
*
* @param i The address of the host.
*
* @return An enumeration of inform communities for a given host (enumeration of <CODE>String).
*/
public Enumeration<String> getInformCommunities(InetAddress i) {
Vector<String> list = null;
if ((list = informDestList.get(i)) != null ) {
if (SNMP_LOGGER.isLoggable(Level.FINER)) {
SNMP_LOGGER.logp(Level.FINER, SnmpAcl.class.getName(),
"getInformCommunities", "["+i.toString()+"] is in list");
}
return list.elements();
} else {
list = new Vector<>();
if (SNMP_LOGGER.isLoggable(Level.FINER)) {
SNMP_LOGGER.logp(Level.FINER, SnmpAcl.class.getName(),
"getInformCommunities", "["+i.toString()+"] is not in list");
}
return list.elements();
}
}
/**
* Converts the input configuration file into ACL.
*/
private void readAuthorizedListFile() {
alwaysAuthorized = false;
if (authorizedListFile == null) {
if (SNMP_LOGGER.isLoggable(Level.FINER)) {
SNMP_LOGGER.logp(Level.FINER, SnmpAcl.class.getName(),
"readAuthorizedListFile", "alwaysAuthorized set to true");
}
alwaysAuthorized = true ;
} else {
// Read the file content
Parser parser = null;
try {
parser= new Parser(new FileInputStream(getAuthorizedListFile()));
} catch (FileNotFoundException e) {
if (SNMP_LOGGER.isLoggable(Level.FINEST)) {
SNMP_LOGGER.logp(Level.FINEST, SnmpAcl.class.getName(),
"readAuthorizedListFile",
"The specified file was not found, authorize everybody");
}
alwaysAuthorized = true ;
return;
}
try {
JDMSecurityDefs n = parser.SecurityDefs();
n.buildAclEntries(owner, acl);
n.buildTrapEntries(trapDestList);
n.buildInformEntries(informDestList);
} catch (ParseException e) {
if (SNMP_LOGGER.isLoggable(Level.FINEST)) {
SNMP_LOGGER.logp(Level.FINEST, SnmpAcl.class.getName(),
"readAuthorizedListFile", "Got parsing exception", e);
}
throw new IllegalArgumentException(e.getMessage());
} catch (Error err) {
if (SNMP_LOGGER.isLoggable(Level.FINEST)) {
SNMP_LOGGER.logp(Level.FINEST, SnmpAcl.class.getName(),
"readAuthorizedListFile", "Got unexpected error", err);
}
throw new IllegalArgumentException(err.getMessage());
}
for(Enumeration<AclEntry> e = acl.entries(); e.hasMoreElements();) {
AclEntryImpl aa = (AclEntryImpl) e.nextElement();
if (SNMP_LOGGER.isLoggable(Level.FINER)) {
SNMP_LOGGER.logp(Level.FINER, SnmpAcl.class.getName(),
"readAuthorizedListFile",
"===> " + aa.getPrincipal().toString());
}
for (Enumeration<java.security.acl.Permission> eee = aa.permissions();eee.hasMoreElements();) {
java.security.acl.Permission perm = eee.nextElement();
if (SNMP_LOGGER.isLoggable(Level.FINER)) {
SNMP_LOGGER.logp(Level.FINER, SnmpAcl.class.getName(),
"readAuthorizedListFile", "perm = " + perm);
}
}
}
}
}
/**
* Set the default full path for "snmp.acl" input file.
* Do not complain if the file does not exists.
*/
private void setDefaultFileName() {
try {
setAuthorizedListFile(getDefaultAclFileName());
} catch (IllegalArgumentException x) {
// OK...
}
}
// PRIVATE VARIABLES
//------------------
/**
* Represents the Access Control List.
*/
private AclImpl acl = null;
/**
* Flag indicating whether the access is always authorized.
* <BR>This is the case if there is no flat file defined.
*/
private boolean alwaysAuthorized = false;
/**
* Represents the Access Control List flat file.
*/
private String authorizedListFile = null;
/**
* Contains the hosts list for trap destination.
*/
private Hashtable<InetAddress, Vector trapDestList = null;
/**
* Contains the hosts list for inform destination.
*/
private Hashtable<InetAddress, Vector informDestList = null;
private PrincipalImpl owner = null;
}
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