/*
* @(#)UnresolvedPermission.java 1.31 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.io.IOException;
import java.io.ByteArrayInputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
import java.lang.reflect.*;
import java.security.cert.*;
/**
* The UnresolvedPermission class is used to hold Permissions that
* were "unresolved" when the Policy was initialized.
* An unresolved permission is one whose actual Permission class
* does not yet exist at the time the Policy is initialized (see below).
*
* <p>The policy for a Java runtime (specifying
* which permissions are available for code from various principals)
* is represented by a Policy object.
* Whenever a Policy is initialized or refreshed, Permission objects of
* appropriate classes are created for all permissions
* allowed by the Policy.
*
* <p>Many permission class types
* referenced by the policy configuration are ones that exist
* locally (i.e., ones that can be found on CLASSPATH).
* Objects for such permissions can be instantiated during
* Policy initialization. For example, it is always possible
* to instantiate a java.io.FilePermission, since the
* FilePermission class is found on the CLASSPATH.
*
* <p>Other permission classes may not yet exist during Policy
* initialization. For example, a referenced permission class may
* be in a JAR file that will later be loaded.
* For each such class, an UnresolvedPermission is instantiated.
* Thus, an UnresolvedPermission is essentially a "placeholder"
* containing information about the permission.
*
* <p>Later, when code calls AccessController.checkPermission
* on a permission of a type that was previously unresolved,
* but whose class has since been loaded, previously-unresolved
* permissions of that type are "resolved". That is,
* for each such UnresolvedPermission, a new object of
* the appropriate class type is instantiated, based on the
* information in the UnresolvedPermission.
*
* <p> To instantiate the new class, UnresolvedPermission assumes
* the class provides a zero, one, and/or two-argument constructor.
* The zero-argument constructor would be used to instantiate
* a permission without a name and without actions.
* A one-arg constructor is assumed to take a <code>String</code>
* name as input, and a two-arg constructor is assumed to take a
* <code>String</code> name and <code>String</code> actions
* as input. UnresolvedPermission may invoke a
* constructor with a <code>null</code> name and/or actions.
* If an appropriate permission constructor is not available,
* the UnresolvedPermission is ignored and the relevant permission
* will not be granted to executing code.
*
* <p> The newly created permission object replaces the
* UnresolvedPermission, which is removed.
*
* <p> Note that the <code>getName</code> method for an
* <code>UnresolvedPermission</code> returns the
* <code>type</code> (class name) for the underlying permission
* that has not been resolved.
*
* @see java.security.Permission
* @see java.security.Permissions
* @see java.security.PermissionCollection
* @see java.security.Policy
*
* @version 1.31 05/11/17
*
* @author Roland Schemers
*/
public final class UnresolvedPermission extends Permission
implements java.io.Serializable
{
private static final long serialVersionUID = -4821973115467008846L;
private static final sun.security.util.Debug debug =
sun.security.util.Debug.getInstance
("policy,access", "UnresolvedPermission");
/**
* The class name of the Permission class that will be
* created when this unresolved permission is resolved.
*
* @serial
*/
private String type;
/**
* The permission name.
*
* @serial
*/
private String name;
/**
* The actions of the permission.
*
* @serial
*/
private String actions;
private transient java.security.cert.Certificate certs[];
/**
* Creates a new UnresolvedPermission containing the permission
* information needed later to actually create a Permission of the
* specified class, when the permission is resolved.
*
* @param type the class name of the Permission class that will be
* created when this unresolved permission is resolved.
* @param name the name of the permission.
* @param actions the actions of the permission.
* @param certs the certificates the permission's class was signed with.
* This is a list of certificate chains, where each chain is composed of a
* signer certificate and optionally its supporting certificate chain.
* Each chain is ordered bottom-to-top (i.e., with the signer certificate
* first and the (root) certificate authority last). The signer
* certificates are copied from the array. Subsequent changes to
* the array will not affect this UnsolvedPermission.
*/
public UnresolvedPermission(String type,
String name,
String actions,
java.security.cert.Certificate certs[])
{
super(type);
if (type == null)
throw new NullPointerException("type can't be null");
this.type = type;
this.name = name;
this.actions = actions;
if (certs != null) {
// Extract the signer certs from the list of certificates.
for (int i=0; i<certs.length; i++) {
if (!(certs[i] instanceof X509Certificate)) {
// there is no concept of signer certs, so we store the
// entire cert array
this.certs =
(java.security.cert.Certificate[])certs.clone();
break;
}
}
if (this.certs == null) {
// Go through the list of certs and see if all the certs are
// signer certs.
int i = 0;
int count = 0;
while (i < certs.length) {
count++;
while (((i+1) < certs.length) &&
((X509Certificate)certs[i]).getIssuerDN().equals(
((X509Certificate)certs[i+1]).getSubjectDN())) {
i++;
}
i++;
}
if (count == certs.length) {
// All the certs are signer certs, so we store the entire
// array
this.certs =
(java.security.cert.Certificate[])certs.clone();
}
if (this.certs == null) {
// extract the signer certs
ArrayList signerCerts = new ArrayList();
i = 0;
while (i < certs.length) {
signerCerts.add(certs[i]);
while (((i+1) < certs.length) &&
((X509Certificate)certs[i]).getIssuerDN().equals(
((X509Certificate)certs[i+1]).getSubjectDN())) {
i++;
}
i++;
}
this.certs =
new java.security.cert.Certificate[signerCerts.size()];
signerCerts.toArray(this.certs);
}
}
}
}
private static final Class[] PARAMS0 = { };
private static final Class[] PARAMS1 = { String.class };
private static final Class[] PARAMS2 = { String.class, String.class };
/**
* try and resolve this permission using the class loader of the permission
* that was passed in.
*/
Permission resolve(Permission p, java.security.cert.Certificate certs[]) {
if (this.certs != null) {
// if p wasn't signed, we don't have a match
if (certs == null) {
return null;
}
// all certs in this.certs must be present in certs
boolean match;
for (int i = 0; i < this.certs.length; i++) {
match = false;
for (int j = 0; j < certs.length; j++) {
if (this.certs[i].equals(certs[j])) {
match = true;
break;
}
}
if (!match) return null;
}
}
try {
Class pc = p.getClass();
if (name == null && actions == null) {
try {
Constructor c = pc.getConstructor(PARAMS0);
return (Permission)c.newInstance(new Object[] {});
} catch (NoSuchMethodException ne) {
try {
Constructor c = pc.getConstructor(PARAMS1);
return (Permission) c.newInstance(
new Object[] { name});
} catch (NoSuchMethodException ne1) {
Constructor c = pc.getConstructor(PARAMS2);
return (Permission) c.newInstance(
new Object[] { name, actions });
}
}
} else {
if (name != null && actions == null) {
try {
Constructor c = pc.getConstructor(PARAMS1);
return (Permission) c.newInstance(
new Object[] { name});
} catch (NoSuchMethodException ne) {
Constructor c = pc.getConstructor(PARAMS2);
return (Permission) c.newInstance(
new Object[] { name, actions });
}
} else {
Constructor c = pc.getConstructor(PARAMS2);
return (Permission) c.newInstance(
new Object[] { name, actions });
}
}
} catch (NoSuchMethodException nsme) {
if (debug != null ) {
debug.println("NoSuchMethodException:\n could not find " +
"proper constructor for " + type);
nsme.printStackTrace();
}
return null;
} catch (Exception e) {
if (debug != null ) {
debug.println("unable to instantiate " + name);
e.printStackTrace();
}
return null;
}
}
/**
* This method always returns false for unresolved permissions.
* That is, an UnresolvedPermission is never considered to
* imply another permission.
*
* @param p the permission to check against.
*
* @return false.
*/
public boolean implies(Permission p) {
return false;
}
/**
* Checks two UnresolvedPermission objects for equality.
* Checks that <i>obj</i> is an UnresolvedPermission, and has
* the same type (class) name, permission name, actions, and
* certificates as this object.
*
* <p> To determine certificate equality, this method only compares
* actual signer certificates. Supporting certificate chains
* are not taken into consideration by this method.
*
* @param obj the object we are testing for equality with this object.
*
* @return true if obj is an UnresolvedPermission, and has the same
* type (class) name, permission name, actions, and
* certificates as this object.
*/
public boolean equals(Object obj) {
if (obj == this)
return true;
if (! (obj instanceof UnresolvedPermission))
return false;
UnresolvedPermission that = (UnresolvedPermission) obj;
// check type
if (!this.type.equals(that.type)) {
return false;
}
// check name
if (this.name == null) {
if (that.name != null) {
return false;
}
} else if (!this.name.equals(that.name)) {
return false;
}
// check actions
if (this.actions == null) {
if (that.actions != null) {
return false;
}
} else {
if (!this.actions.equals(that.actions)) {
return false;
}
}
// check certs
if ((this.certs == null && that.certs != null) ||
(this.certs != null && that.certs == null) ||
(this.certs != null && that.certs != null &&
this.certs.length != that.certs.length)) {
return false;
}
int i,j;
boolean match;
for (i = 0; this.certs != null && i < this.certs.length; i++) {
match = false;
for (j = 0; j < that.certs.length; j++) {
if (this.certs[i].equals(that.certs[j])) {
match = true;
break;
}
}
if (!match) return false;
}
for (i = 0; that.certs != null && i < that.certs.length; i++) {
match = false;
for (j = 0; j < this.certs.length; j++) {
if (that.certs[i].equals(this.certs[j])) {
match = true;
break;
}
}
if (!match) return false;
}
return true;
}
/**
* Returns the hash code value for this object.
*
* @return a hash code value for this object.
*/
public int hashCode() {
int hash = type.hashCode();
if (name != null)
hash ^= name.hashCode();
if (actions != null)
hash ^= actions.hashCode();
return hash;
}
/**
* Returns the canonical string representation of the actions,
* which currently is the empty string "", since there are no actions for
* an UnresolvedPermission. That is, the actions for the
* permission that will be created when this UnresolvedPermission
* is resolved may be non-null, but an UnresolvedPermission
* itself is never considered to have any actions.
*
* @return the empty string "".
*/
public String getActions()
{
return "";
}
/**
* Get the type (class name) of the underlying permission that
* has not been resolved.
*
* @return the type (class name) of the underlying permission that
* has not been resolved
*
* @since 1.5
*/
public String getUnresolvedType() {
return type;
}
/**
* Get the target name of the underlying permission that
* has not been resolved.
*
* @return the target name of the underlying permission that
* has not been resolved, or <code>null</code>,
* if there is no targe name
*
* @since 1.5
*/
public String getUnresolvedName() {
return name;
}
/**
* Get the actions for the underlying permission that
* has not been resolved.
*
* @return the actions for the underlying permission that
* has not been resolved, or <code>null</code>
* if there are no actions
*
* @since 1.5
*/
public String getUnresolvedActions() {
return actions;
}
/**
* Get the signer certificates (without any supporting chain)
* for the underlying permission that has not been resolved.
*
* @return the signer certificates for the underlying permission that
* has not been resolved, or null, if there are no signer certificates.
* Returns a new array each time this method is called.
*
* @since 1.5
*/
public java.security.cert.Certificate[] getUnresolvedCerts() {
return (certs == null) ? null :
(java.security.cert.Certificate[])certs.clone();
}
/**
* Returns a string describing this UnresolvedPermission. The convention
* is to specify the class name, the permission name, and the actions, in
* the following format: '(unresolved "ClassName" "name" "actions")'.
*
* @return information about this UnresolvedPermission.
*/
public String toString() {
return "(unresolved " + type + " " + name + " " + actions + ")";
}
/**
* Returns a new PermissionCollection object for storing
* UnresolvedPermission objects.
* <p>
* @return a new PermissionCollection object suitable for
* storing UnresolvedPermissions.
*/
public PermissionCollection newPermissionCollection() {
return new UnresolvedPermissionCollection();
}
/**
* Writes this object out to a stream (i.e., serializes it).
*
* @serialData An initial <code>String</code> denoting the
* <code>type</code> is followed by a <code>String</code> denoting the
* <code>name</code> is followed by a <code>String</code> denoting the
* <code>actions</code> is followed by an <code>int</code> indicating the
* number of certificates to follow
* (a value of "zero" denotes that there are no certificates associated
* with this object).
* Each certificate is written out starting with a <code>String</code>
* denoting the certificate type, followed by an
* <code>int</code> specifying the length of the certificate encoding,
* followed by the certificate encoding itself which is written out as an
* array of bytes.
*/
private void writeObject(java.io.ObjectOutputStream oos)
throws IOException
{
oos.defaultWriteObject();
if (certs==null || certs.length==0) {
oos.writeInt(0);
} else {
// write out the total number of certs
oos.writeInt(certs.length);
// write out each cert, including its type
for (int i=0; i < certs.length; i++) {
java.security.cert.Certificate cert = certs[i];
try {
oos.writeUTF(cert.getType());
byte[] encoded = cert.getEncoded();
oos.writeInt(encoded.length);
oos.write(encoded);
} catch (CertificateEncodingException cee) {
throw new IOException(cee.getMessage());
}
}
}
}
/**
* Restores this object from a stream (i.e., deserializes it).
*/
private void readObject(java.io.ObjectInputStream ois)
throws IOException, ClassNotFoundException
{
CertificateFactory cf;
Hashtable cfs=null;
ois.defaultReadObject();
if (type == null)
throw new NullPointerException("type can't be null");
// process any new-style certs in the stream (if present)
int size = ois.readInt();
if (size > 0) {
// we know of 3 different cert types: X.509, PGP, SDSI, which
// could all be present in the stream at the same time
cfs = new Hashtable(3);
this.certs = new java.security.cert.Certificate[size];
}
for (int i=0; i<size; i++) {
// read the certificate type, and instantiate a certificate
// factory of that type (reuse existing factory if possible)
String certType = ois.readUTF();
if (cfs.containsKey(certType)) {
// reuse certificate factory
cf = (CertificateFactory)cfs.get(certType);
} else {
// create new certificate factory
try {
cf = CertificateFactory.getInstance(certType);
} catch (CertificateException ce) {
throw new ClassNotFoundException
("Certificate factory for "+certType+" not found");
}
// store the certificate factory so we can reuse it later
cfs.put(certType, cf);
}
// parse the certificate
byte[] encoded=null;
try {
encoded = new byte[ois.readInt()];
} catch (OutOfMemoryError oome) {
throw new IOException("Certificate too big");
}
ois.readFully(encoded);
ByteArrayInputStream bais = new ByteArrayInputStream(encoded);
try {
this.certs[i] = cf.generateCertificate(bais);
} catch (CertificateException ce) {
throw new IOException(ce.getMessage());
}
bais.close();
}
}
}
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