/* Security.java --- Java base security class implmentation Copyright (C) 1999, 2001, 2002 Free Software Foundation, Inc. This file is part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Classpath 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 for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; see the file COPYING. If not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version. */ package java.security; import java.io.File; import java.io.InputStream; import java.io.IOException; import java.io.FileNotFoundException; import java.net.URL; import java.security.Provider; import java.util.Vector; import java.util.Enumeration; import java.util.Properties; /** Security class that loads the Providers and provides an interface to security properties. @author Mark Benvenuto <ivymccough@worldnet.att.net> */ public final class Security extends Object { private static Vector providers = new Vector(); private static Properties secprops; static { String base = System.getProperty("gnu.classpath.home.url"); loadProviders(base, System.getProperty("gnu.classpath.vm.shortname")); loadProviders(base, "classpath"); } // This class can't be instantiated. private Security () { } private static void loadProviders(String baseUrl, String vendor) { if (baseUrl == null || vendor == null) return; String secfilestr = baseUrl + "/security/" + vendor + ".security"; try { InputStream fin = new URL(secfilestr).openStream(); secprops = new Properties(); secprops.load(fin); int i = 1; String name; while ((name = secprops.getProperty("security.provider." + i)) != null) { Exception exception = null; try { providers.addElement(Class.forName(name).newInstance()); } catch (ClassNotFoundException x) { exception = x; } catch (InstantiationException x) { exception = x; } catch (IllegalAccessException x) { exception = x; } if (exception != null) System.err.println ("Error loading security provider " + name + ": " + exception); i++; } } catch (FileNotFoundException ignored) { // Actually we probibly shouldn't ignore these, once the security // properties file is actually installed somewhere. } catch (IOException ignored) { } } /** Gets a specific property for an algorithm. This is used to produce specialized algorithm parsers. @deprecated it used to a return the value of a propietary property for the "SUN" Cryptographic Service Provider to obtain algorithm-specific parameters. Used AlogorithmParameters and KeyFactory instead. @param algName name of algorithm to get property of @param propName name of property to check @return a string containing the value of the property */ public static String getAlgorithmProperty(String algName, String propName) { /* TODO: Figure out what this actually does */ return null; } /** Adds a new provider, at a specified position. The position is the preference order in which providers are searched for requested algorithms. Note that it is not guaranteed that this preference will be respected. The position is 1-based, that is, 1 is most preferred, followed by 2, and so on. <p> If the given provider is installed at the requested position, the provider that used to be at that position, and all providers with a position greater than position, are shifted up one position (towards the end of the list of installed providers). <p> A provider cannot be added if it is already installed. <p> <b>NOT IMPLEMENTED YET:</b>[ First, if there is a security manager, its <code>checkSecurityAccess</code> method is called with the string <code>"insertProvider."+provider.getName()</code> to see if it's ok to add a new provider. If the default implementation of <code>checkSecurityAccess</code> is used (i.e., that method is not overriden), then this will result in a call to the security manager's <code>checkPermission</code> method with a <code>SecurityPermission( "insertProvider."+provider.getName())</code> permission.] @param provider the provider to be added. @param position the preference position that the caller would like for this provider. @return the actual preference position (1-based) in which the provider was added, or -1 if the provider was not added because it is already installed. @throws SecurityException if a security manager exists and its <code> SecurityManager.checkSecurityAccess(java.lang.String)</code> method denies access to add a new provider. */ public static int insertProviderAt(Provider provider, int position) { SecurityManager sm = System.getSecurityManager(); if (sm != null) sm.checkSecurityAccess("insertProvider." + provider.getName()); position--; int max = providers.size (); for (int i = 0; i < max; i++) { if (((Provider) providers.elementAt(i)).getName() == provider.getName()) return -1; } if (position < 0) position = 0; if (position > max) position = max; providers.insertElementAt(provider, position); return position + 1; } /** Adds a provider to the next position available. <p> <b>NOT IMPLEMENTED YET:</b> [ First, if there is a security manager, its <code>checkSecurityAccess</code> method is called with the string <code>"insertProvider."+provider.getName()</code> to see if it's ok to add a new provider. If the default implementation of <code>checkSecurityAccess</code> is used (i.e., that method is not overriden), then this will result in a call to the security manager's <code>checkPermission</code> method with a <code>SecurityPermission( "insertProvider."+provider.getName())</code> permission.] @param provider the provider to be added. @return the preference position in which the provider was added, or <code> -1</code> if the provider was not added because it is already installed. @throws SecurityException if a security manager exists and its <code> SecurityManager.checkSecurityAccess(java.lang.String)</code> method denies access to add a new provider. */ public static int addProvider(Provider provider) { return insertProviderAt (provider, providers.size () + 1); } /** Removes a provider. This allows dynamic unloading of providers. It will automatically shift up providers to a higher ranking. If the provider is not installed, it fails silently. This method checks the security manager with the call checkSecurityAccess with "removeProvider."+provider.getName() to see if the user can remove this provider. @param name name of the provider to add @throws SecurityException - if the security manager denies access to remove a new provider */ public static void removeProvider(String name) { SecurityManager sm = System.getSecurityManager(); if (sm != null) sm.checkSecurityAccess("removeProvider." + name); Provider p = null; int max = providers.size (); for (int i = 0; i < max; i++) { if (((Provider) providers.elementAt(i)).getName() == name) { providers.remove(i); break; } } } /** Returns array containing all the providers. It is in the preference order of the providers. @return an array of installed providers */ public static Provider[] getProviders() { Provider array[] = new Provider[providers.size ()]; providers.copyInto (array); return array; } /** Returns the provider with the specified name. It will return null if the provider cannot be found. @param name name of the requested provider @return requested provider */ public static Provider getProvider(String name) { Provider p; int max = providers.size (); for (int i = 0; i < max; i++) { p = (Provider) providers.elementAt(i); if (p.getName() == name) return p; } return null; } /** Gets the value of a security property. This method checks the security manager with the call checkSecurityAccess with "getProperty."+key to see if the user can get this property. @param key property to get @return value of the property @throws SecurityException - if the security manager denies access to getting a property */ public static String getProperty(String key) { SecurityManager sm = System.getSecurityManager(); if (sm != null) sm.checkSecurityAccess("getProperty." + key); return secprops.getProperty(key); } /** Sets the value of a security property. This method checks the security manager with the call checkSecurityAccess with "setProperty."+key to see if the user can get this property. @param key property to set @param datnum new value of property @throws SecurityException - if the security manager denies access to setting a property */ public static void setProperty(String key, String datnum) { SecurityManager sm = System.getSecurityManager(); if (sm != null) sm.checkSecurityAccess("setProperty." + key); secprops.put(key, datnum); } }