/*
* @(#)Policy.java 1.50 04/05/18
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package javax.security.auth;
/**
* <p> This is an abstract class for representing the system policy for
* Subject-based authorization. A subclass implementation
* of this class provides a means to specify a Subject-based
* access control <code>Policy</code>.
*
* <p> A <code>Policy</code> object can be queried for the set of
* Permissions granted to code running as a
* <code>Principal</code> in the following manner:
*
* <pre>
* policy = Policy.getPolicy();
* PermissionCollection perms = policy.getPermissions(subject,
* codeSource);
* </pre>
*
* The <code>Policy</code> object consults the local policy and returns
* and appropriate <code>Permissions</code> object with the
* Permissions granted to the Principals associated with the
* provided <i>subject</i>, and granted to the code specified
* by the provided <i>codeSource</i>.
*
* <p> A <code>Policy</code> contains the following information.
* Note that this example only represents the syntax for the default
* <code>Policy</code> implementation. Subclass implementations of this class
* may implement alternative syntaxes and may retrieve the
* <code>Policy</code> from any source such as files, databases,
* or servers.
*
* <p> Each entry in the <code>Policy</code> is represented as
* a <b><i>grant</i></b> entry. Each <b><i>grant</i></b> entry
* specifies a codebase, code signers, and Principals triplet,
* as well as the Permissions granted to that triplet.
*
* <pre>
* grant CodeBase ["URL"], Signedby ["signers"],
* Principal [Principal_Class] "Principal_Name" {
* Permission Permission_Class ["Target_Name"]
* [, "Permission_Actions"]
* [, signedBy "SignerName"];
* };
* </pre>
*
* The CodeBase and Signedby components of the triplet name/value pairs
* are optional. If they are not present, then any any codebase will match,
* and any signer (including unsigned code) will match.
* For Example,
*
* <pre>
* grant CodeBase "foo.com", Signedby "foo",
* Principal com.sun.security.auth.SolarisPrincipal "duke" {
* permission java.io.FilePermission "/home/duke", "read, write";
* };
* </pre>
*
* This <b><i>grant</i></b> entry specifies that code from "foo.com",
* signed by "foo', and running as a <code>SolarisPrincipal</code> with the
* name, duke, has one <code>Permission</code>. This <code>Permission</code>
* permits the executing code to read and write files in the directory,
* "/home/duke".
*
* <p> To "run" as a particular <code>Principal</code>,
* code invokes the <code>Subject.doAs(subject, ...)</code> method.
* After invoking that method, the code runs as all the Principals
* associated with the specified <code>Subject</code>.
* Note that this <code>Policy</code> (and the Permissions
* granted in this <code>Policy</code>) only become effective
* after the call to <code>Subject.doAs</code> has occurred.
*
* <p> Multiple Principals may be listed within one <b><i>grant</i></b> entry.
* All the Principals in the grant entry must be associated with
* the <code>Subject</code> provided to <code>Subject.doAs</code>
* for that <code>Subject</code> to be granted the specified Permissions.
*
* <pre>
* grant Principal com.sun.security.auth.SolarisPrincipal "duke",
* Principal com.sun.security.auth.SolarisNumericUserPrincipal "0" {
* permission java.io.FilePermission "/home/duke", "read, write";
* permission java.net.SocketPermission "duke.com", "connect";
* };
* </pre>
*
* This entry grants any code running as both "duke" and "0"
* permission to read and write files in duke's home directory,
* as well as permission to make socket connections to "duke.com".
*
* <p> Note that non Principal-based grant entries are not permitted
* in this <code>Policy</code>. Therefore, grant entries such as:
*
* <pre>
* grant CodeBase "foo.com", Signedby "foo" {
* permission java.io.FilePermission "/tmp/scratch", "read, write";
* };
* </pre>
*
* are rejected. Such permission must be listed in the
* <code>java.security.Policy</code>.
*
* <p> The default <code>Policy</code> implementation can be changed by
* setting the value of the "auth.policy.provider" security property
* (in the Java security properties file) to the fully qualified name of
* the desired <code>Policy</code> implementation class.
* The Java security properties file is located in the file named
* <JAVA_HOME>/lib/security/java.security, where <JAVA_HOME>
* refers to the directory where the JDK was installed.
*
* @deprecated as of JDK version 1.4 -- Replaced by java.security.Policy.
* java.security.Policy has a method:
* <pre>
* public PermissionCollection getPermissions
* (java.security.ProtectionDomain pd)
*
* </pre>
* and ProtectionDomain has a constructor:
* <pre>
* public ProtectionDomain
* (CodeSource cs,
* PermissionCollection permissions,
* ClassLoader loader,
* Principal[] principals)
* </pre>
*
* These two APIs provide callers the means to query the
* Policy for Principal-based Permission entries.
*
*
* @version 1.50, 05/18/04
*/
@Deprecated
public abstract class Policy {
private static Policy policy;
private static ClassLoader contextClassLoader;
static {
contextClassLoader =
(ClassLoader)java.security.AccessController.doPrivileged
(new java.security.PrivilegedAction() {
public Object run() {
return Thread.currentThread().getContextClassLoader();
}
});
};
/**
* Sole constructor. (For invocation by subclass constructors, typically
* implicit.)
*/
protected Policy() { }
/**
* Returns the installed Policy object.
* This method first calls
* <code>SecurityManager.checkPermission</code> with the
* <code>AuthPermission("getPolicy")</code> permission
* to ensure the caller has permission to get the Policy object.
*
* <p>
*
* @return the installed Policy. The return value cannot be
* <code>null</code>.
*
* @exception java.lang.SecurityException if the current thread does not
* have permission to get the Policy object.
*
* @see #setPolicy
*/
public static Policy getPolicy() {
java.lang.SecurityManager sm = System.getSecurityManager();
if (sm != null) sm.checkPermission(new AuthPermission("getPolicy"));
return getPolicyNoCheck();
}
/**
* Returns the installed Policy object, skipping the security check.
*
* @return the installed Policy.
*
*/
static Policy getPolicyNoCheck() {
if (policy == null) {
synchronized(Policy.class) {
if (policy == null) {
String policy_class = null;
policy_class = (String)
java.security.AccessController.doPrivileged
(new java.security.PrivilegedAction() {
public Object run() {
return java.security.Security.getProperty
("auth.policy.provider");
}
});
if (policy_class == null) {
policy_class = "com.sun.security.auth.PolicyFile";
}
try {
final String finalClass = policy_class;
policy = (Policy)
java.security.AccessController.doPrivileged
(new java.security.PrivilegedExceptionAction() {
public Object run() throws ClassNotFoundException,
InstantiationException,
IllegalAccessException {
return Class.forName
(finalClass,
true,
contextClassLoader).newInstance();
}
});
} catch (Exception e) {
throw new SecurityException
(sun.security.util.ResourcesMgr.getString
("unable to instantiate Subject-based policy"));
}
}
}
}
return policy;
}
/**
* Sets the system-wide Policy object. This method first calls
* <code>SecurityManager.checkPermission</code> with the
* <code>AuthPermission("setPolicy")</code>
* permission to ensure the caller has permission to set the Policy.
*
* <p>
*
* @param policy the new system Policy object.
*
* @exception java.lang.SecurityException if the current thread does not
* have permission to set the Policy.
*
* @see #getPolicy
*/
public static void setPolicy(Policy policy) {
java.lang.SecurityManager sm = System.getSecurityManager();
if (sm != null) sm.checkPermission(new AuthPermission("setPolicy"));
Policy.policy = policy;
}
/**
* Retrieve the Permissions granted to the Principals associated with
* the specified <code>CodeSource</code>.
*
* <p>
*
* @param subject the <code>Subject</code>
* whose associated Principals,
* in conjunction with the provided
* <code>CodeSource</code>, determines the Permissions
* returned by this method. This parameter
* may be <code>null</code>. <p>
*
* @param cs the code specified by its <code>CodeSource</code>
* that determines, in conjunction with the provided
* <code>Subject</code>, the Permissions
* returned by this method. This parameter may be
* <code>null</code>.
*
* @return the Collection of Permissions granted to all the
* <code>Subject</code> and code specified in
* the provided <i>subject</i> and <i>cs</i>
* parameters.
*/
public abstract java.security.PermissionCollection getPermissions
(Subject subject,
java.security.CodeSource cs);
/**
* Refresh and reload the Policy.
*
* <p>This method causes this object to refresh/reload its current
* Policy. This is implementation-dependent.
* For example, if the Policy object is stored in
* a file, calling <code>refresh</code> will cause the file to be re-read.
*
* <p>
*
* @exception SecurityException if the caller does not have permission
* to refresh the Policy.
*/
public abstract void refresh();
}
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