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/**
* Copyright 2012 JogAmp Community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied, of JogAmp Community.
*/
package com.jogamp.common.util;
import java.security.AccessController;
import java.security.AllPermission;
import java.security.CodeSource;
import java.security.Permission;
import java.security.PrivilegedAction;
import java.security.ProtectionDomain;
import java.security.cert.Certificate;
public class SecurityUtil {
private static final SecurityManager securityManager;
private static final Permission allPermissions;
private static final boolean DEBUG = false;
static {
allPermissions = new AllPermission();
securityManager = System.getSecurityManager();
if( DEBUG ) {
final boolean hasAllPermissions;
{
final ProtectionDomain insecPD = AccessController.doPrivileged(new PrivilegedAction<ProtectionDomain>() {
@Override
public ProtectionDomain run() {
return SecurityUtil.class.getProtectionDomain();
} } );
boolean _hasAllPermissions;
try {
insecPD.implies(allPermissions);
_hasAllPermissions = true;
} catch( final SecurityException ace ) {
_hasAllPermissions = false;
}
hasAllPermissions = _hasAllPermissions;
}
System.err.println("SecurityUtil: Has SecurityManager: "+ ( null != securityManager ) ) ;
System.err.println("SecurityUtil: Has AllPermissions: "+hasAllPermissions);
final Certificate[] certs = AccessController.doPrivileged(new PrivilegedAction<Certificate[]>() {
@Override
public Certificate[] run() {
return getCerts(SecurityUtil.class);
} } );
System.err.println("SecurityUtil: Cert count: "+ ( null != certs ? certs.length : 0 ));
if( null != certs ) {
for(int i=0; i<certs.length; i++) {
System.err.println("\t cert["+i+"]: "+certs[i].toString());
}
}
}
}
/**
* Returns <code>true</code> if no {@link SecurityManager} has been installed
* or the installed {@link SecurityManager}'s <code>checkPermission(new AllPermission())</code>
* passes. Otherwise method returns <code>false</code>.
*/
public static final boolean hasAllPermissions() {
return hasPermission(allPermissions);
}
/**
* Returns <code>true</code> if no {@link SecurityManager} has been installed
* or the installed {@link SecurityManager}'s <code>checkPermission(perm)</code>
* passes. Otherwise method returns <code>false</code>.
*/
public static final boolean hasPermission(final Permission perm) {
try {
checkPermission(perm);
return true;
} catch( final SecurityException ace ) {
return false;
}
}
/**
* Throws an {@link SecurityException} if an installed {@link SecurityManager}
* does not permit the requested {@link AllPermission}.
*/
public static final void checkAllPermissions() throws SecurityException {
checkPermission(allPermissions);
}
/**
* Throws an {@link SecurityException} if an installed {@link SecurityManager}
* does not permit the requested {@link Permission}.
*/
public static final void checkPermission(final Permission perm) throws SecurityException {
if( null != securityManager ) {
securityManager.checkPermission(perm);
}
}
/**
* Returns <code>true</code> if no {@link SecurityManager} has been installed
* or the installed {@link SecurityManager}'s <code>checkLink(libName)</code>
* passes. Otherwise method returns <code>false</code>.
*/
public static final boolean hasLinkPermission(final String libName) {
try {
checkLinkPermission(libName);
return true;
} catch( final SecurityException ace ) {
return false;
}
}
/**
* Throws an {@link SecurityException} if an installed {@link SecurityManager}
* does not permit to dynamically link the given libName.
*/
public static final void checkLinkPermission(final String libName) throws SecurityException {
if( null != securityManager ) {
securityManager.checkLink(libName);
}
}
/**
* Throws an {@link SecurityException} if an installed {@link SecurityManager}
* does not permit to dynamically link to all libraries.
*/
public static final void checkAllLinkPermission() throws SecurityException {
if( null != securityManager ) {
securityManager.checkPermission(allLinkPermission);
}
}
private static final RuntimePermission allLinkPermission = new RuntimePermission("loadLibrary.*");
/**
* @param clz
* @return
* @throws SecurityException if the caller has no permission to access the ProtectedDomain of the given class.
*/
public static final Certificate[] getCerts(final Class<?> clz) throws SecurityException {
final ProtectionDomain pd = clz.getProtectionDomain();
final CodeSource cs = (null != pd) ? pd.getCodeSource() : null;
final Certificate[] certs = (null != cs) ? cs.getCertificates() : null;
return (null != certs && certs.length>0) ? certs : null;
}
public static final boolean equals(final Certificate[] a, final Certificate[] b) {
if(a == b) {
return true;
}
if(a==null || b==null) {
return false;
}
if(a.length != b.length) {
return false;
}
int i = 0;
while( i < a.length && a[i].equals(b[i]) ) {
i++;
}
return i == a.length;
}
}
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