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/* * @(#)ProtectionDomain.java 1.47 05/11/17 * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package java.security; import java.util.Enumeration; import java.util.List; import java.util.ArrayList; import sun.security.util.Debug; import sun.security.util.SecurityConstants; /** * *<p> * This ProtectionDomain class encapsulates the characteristics of a domain, * which encloses a set of classes whose instances are granted a set * of permissions when being executed on behalf of a given set of Principals. * <p> * A static set of permissions can be bound to a ProtectionDomain when it is * constructed; such permissions are granted to the domain regardless of the * Policy in force. However, to support dynamic security policies, a * ProtectionDomain can also be constructed such that it is dynamically * mapped to a set of permissions by the current Policy whenever a permission * is checked. * <p> * * @version 1.47, 11/17/05 * @author Li Gong * @author Roland Schemers * @author Gary Ellison */ public class ProtectionDomain { /* CodeSource */ private CodeSource codesource ; /* ClassLoader the protection domain was consed from */ private ClassLoader classloader; /* Principals running-as within this protection domain */ private Principal[] principals; /* the rights this protection domain is granted */ private PermissionCollection permissions; /* if the permissions object has AllPermission */ private boolean hasAllPerm = false; /* the PermissionCollection is static (pre 1.4 constructor) or dynamic (via a policy refresh) */ private boolean staticPermissions; private static final Debug debug = Debug.getInstance("domain"); /** * Creates a new ProtectionDomain with the given CodeSource and * Permissions. If the permissions object is not null, then * <code>setReadOnly())</code> will be called on the passed in * Permissions object. The only permissions granted to this domain * are the ones specified; the current Policy will not be consulted. * * @param codesource the codesource associated with this domain * @param permissions the permissions granted to this domain */ public ProtectionDomain(CodeSource codesource, PermissionCollection permissions) { this.codesource = codesource; if (permissions != null) { this.permissions = permissions; this.permissions.setReadOnly(); if (permissions instanceof Permissions && ((Permissions)permissions).allPermission != null) { hasAllPerm = true; } } this.classloader = null; this.principals = new Principal[0]; staticPermissions = true; } /** * Creates a new ProtectionDomain qualified by the given CodeSource, * Permissions, ClassLoader and array of Principals. If the * permissions object is not null, then <code>setReadOnly()</code> * will be called on the passed in Permissions object. * The permissions granted to this domain are dynamic; they include * both the static permissions passed to this constructor, and any * permissions granted to this domain by the current Policy at the * time a permission is checked. * <p> * This constructor is typically used by * {@link SecureClassLoader ClassLoaders} * and {@link DomainCombiner DomainCombiners} which delegate to * <code>Policy</code> to actively associate the permissions granted to * this domain. This constructor affords the * Policy provider the opportunity to augment the supplied * PermissionCollection to reflect policy changes. * <p> * * @param codesource the CodeSource associated with this domain * @param permissions the permissions granted to this domain * @param classloader the ClassLoader associated with this domain * @param principals the array of Principals associated with this * domain. The contents of the array are copied to protect against * subsequent modification. * @see Policy#refresh * @see Policy#getPermissions(ProtectionDomain) * @since 1.4 */ public ProtectionDomain(CodeSource codesource, PermissionCollection permissions, ClassLoader classloader, Principal[] principals) { this.codesource = codesource; if (permissions != null) { this.permissions = permissions; this.permissions.setReadOnly(); if (permissions instanceof Permissions && ((Permissions)permissions).allPermission != null) { hasAllPerm = true; } } this.classloader = classloader; this.principals = (principals != null ? (Principal[])principals.clone(): new Principal[0]); staticPermissions = false; } /** * Returns the CodeSource of this domain. * @return the CodeSource of this domain which may be null. * @since 1.2 */ public final CodeSource getCodeSource() { return this.codesource; } /** * Returns the ClassLoader of this domain. * @return the ClassLoader of this domain which may be null. * * @since 1.4 */ public final ClassLoader getClassLoader() { return this.classloader; } /** * Returns an array of principals for this domain. * @return a non-null array of principals for this domain. * Returns a new array each time this method is called. * * @since 1.4 */ public final Principal[] getPrincipals() { return (Principal[])this.principals.clone(); } /** * Returns the static permissions granted to this domain. * * @return the static set of permissions for this domain which may be null. * @see Policy#refresh * @see Policy#getPermissions(ProtectionDomain) */ public final PermissionCollection getPermissions() { return permissions; } /** * Check and see if this ProtectionDomain implies the permissions * expressed in the Permission object. * <p> * The set of permissions evaluated is a function of whether the * ProtectionDomain was constructed with a static set of permissions * or it was bound to a dynamically mapped set of permissions. * <p> * If the ProtectionDomain was constructed to a * {@link #ProtectionDomain(CodeSource, PermissionCollection) * statically bound} PermissionCollection then the permission will * only be checked against the PermissionCollection supplied at * construction. * <p> * However, if the ProtectionDomain was constructed with * the constructor variant which supports * {@link #ProtectionDomain(CodeSource, PermissionCollection, * ClassLoader, java.security.Principal[]) dynamically binding} * permissions, then the permission will be checked against the * combination of the PermissionCollection supplied at construction and * the current Policy binding. * <p> * * @param permission the Permission object to check. * * @return true if "permission" is implicit to this ProtectionDomain. */ public boolean implies(Permission permission) { if (hasAllPerm) { // internal permission collection already has AllPermission - // no need to go to policy return true; } if (!staticPermissions && Policy.getPolicyNoCheck().implies(this, permission)) return true; if (permissions != null) return permissions.implies(permission); return false; } /** * Convert a ProtectionDomain to a String. */ public String toString() { String pals = "<no principals>"; if (principals != null && principals.length > 0) { StringBuilder palBuf = new StringBuilder("(principals "); for (int i = 0; i < principals.length; i++) { palBuf.append(principals[i].getClass().getName() + " \"" + principals[i].getName() + "\""); if (i < principals.length-1) palBuf.append(",\n"); else palBuf.append(")\n"); } pals = palBuf.toString(); } // Check if policy is set; we don't want to load // the policy prematurely here PermissionCollection pc = Policy.isSet() && seeAllp() ? mergePermissions(): getPermissions(); return "ProtectionDomain "+ " "+codesource+"\n"+ " "+classloader+"\n"+ " "+pals+"\n"+ " "+pc+"\n"; } /** * Return true (merge policy permissions) in the following cases: * * . SecurityManager is null * * . SecurityManager is not null, * debug is not null, * SecurityManager impelmentation is in bootclasspath, * Policy implementation is in bootclasspath * (the bootclasspath restrictions avoid recursion) * * . SecurityManager is not null, * debug is null, * caller has Policy.getPolicy permission */ private static boolean seeAllp() { SecurityManager sm = System.getSecurityManager(); if (sm == null) { return true; } else { if (debug != null) { if (sm.getClass().getClassLoader() == null && Policy.getPolicyNoCheck().getClass().getClassLoader() == null) { return true; } } else { try { sm.checkPermission(SecurityConstants.GET_POLICY_PERMISSION); return true; } catch (SecurityException se) { // fall thru and return false } } } return false; } private PermissionCollection mergePermissions() { if (staticPermissions) return permissions; PermissionCollection perms = (PermissionCollection) java.security.AccessController.doPrivileged (new java.security.PrivilegedAction() { public Object run() { Policy p = Policy.getPolicyNoCheck(); return p.getPermissions(ProtectionDomain.this); } }); Permissions mergedPerms = new Permissions(); int swag = 32; int vcap = 8; Enumeration e; List pdVector = new ArrayList(vcap); List plVector = new ArrayList(swag); // // Build a vector of domain permissions for subsequent merge if (permissions != null) { synchronized (permissions) { e = permissions.elements(); while (e.hasMoreElements()) { Permission p = (Permission)e.nextElement(); pdVector.add(p); } } } // // Build a vector of Policy permissions for subsequent merge if (perms != null) { synchronized (perms) { e = perms.elements(); while (e.hasMoreElements()) { plVector.add(e.nextElement()); vcap++; } } } if (perms != null && permissions != null) { // // Weed out the duplicates from the policy. Unless a refresh // has occured since the pd was consed this should result in // an empty vector. synchronized (permissions) { e = permissions.elements(); // domain vs policy while (e.hasMoreElements()) { Permission pdp = (Permission)e.nextElement(); Class pdpClass = pdp.getClass(); String pdpActions = pdp.getActions(); String pdpName = pdp.getName(); for (int i = 0; i < plVector.size(); i++) { Permission pp = (Permission) plVector.get(i); if (pdpClass.isInstance(pp)) { // The equals() method on some permissions // have some side effects so this manual // comparison is sufficient. if (pdpName.equals(pp.getName()) && pdpActions.equals(pp.getActions())) { plVector.remove(i); break; } } } } } } if (perms !=null) { // the order of adding to merged perms and permissions // needs to preserve the bugfix 4301064 for (int i = plVector.size()-1; i >= 0; i--) { mergedPerms.add((Permission)plVector.get(i)); } } if (permissions != null) { for (int i = pdVector.size()-1; i >= 0; i--) { mergedPerms.add((Permission)pdVector.get(i)); } } return mergedPerms; } }