JDK8/Java8源码在线阅读
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* accompanied this code).
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package javax.security.auth.login;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;
import java.util.LinkedList;
import java.util.Map;
import java.util.HashMap;
import java.text.MessageFormat;
import javax.security.auth.Subject;
import javax.security.auth.AuthPermission;
import javax.security.auth.callback.*;
import java.security.AccessController;
import java.security.AccessControlContext;
import sun.security.util.PendingException;
import sun.security.util.ResourcesMgr;
/**
* <p> The {@code LoginContext} class describes the basic methods used
* to authenticate Subjects and provides a way to develop an
* application independent of the underlying authentication technology.
* A {@code Configuration} specifies the authentication technology, or
* {@code LoginModule}, to be used with a particular application.
* Different LoginModules can be plugged in under an application
* without requiring any modifications to the application itself.
*
* <p> In addition to supporting <i>pluggable</i> authentication, this class
* also supports the notion of <i>stacked</i> authentication.
* Applications may be configured to use more than one
* LoginModule. For example, one could
* configure both a Kerberos LoginModule and a smart card
* LoginModule under an application.
*
* <p> A typical caller instantiates a LoginContext with
* a <i>name</i> and a {@code CallbackHandler}.
* LoginContext uses the <i>name</i> as the index into a
* Configuration to determine which LoginModules should be used,
* and which ones must succeed in order for the overall authentication to
* succeed. The {@code CallbackHandler} is passed to the underlying
* LoginModules so they may communicate and interact with users
* (prompting for a username and password via a graphical user interface,
* for example).
*
* <p> Once the caller has instantiated a LoginContext,
* it invokes the {@code login} method to authenticate
* a {@code Subject}. The {@code login} method invokes
* the configured modules to perform their respective types of authentication
* (username/password, smart card pin verification, etc.).
* Note that the LoginModules will not attempt authentication retries nor
* introduce delays if the authentication fails.
* Such tasks belong to the LoginContext caller.
*
* <p> If the {@code login} method returns without
* throwing an exception, then the overall authentication succeeded.
* The caller can then retrieve
* the newly authenticated Subject by invoking the
* {@code getSubject} method. Principals and Credentials associated
* with the Subject may be retrieved by invoking the Subject's
* respective {@code getPrincipals}, {@code getPublicCredentials},
* and {@code getPrivateCredentials} methods.
*
* <p> To logout the Subject, the caller calls
* the {@code logout} method. As with the {@code login}
* method, this {@code logout} method invokes the {@code logout}
* method for the configured modules.
*
* <p> A LoginContext should not be used to authenticate
* more than one Subject. A separate LoginContext
* should be used to authenticate each different Subject.
*
* <p> The following documentation applies to all LoginContext constructors:
* <ol>
*
* <li> {@code Subject}
* <ul>
* <li> If the constructor has a Subject
* input parameter, the LoginContext uses the caller-specified
* Subject object.
*
* <li> If the caller specifies a {@code null} Subject
* and a {@code null} value is permitted,
* the LoginContext instantiates a new Subject.
*
* <li> If the constructor does <b>not</b> have a Subject
* input parameter, the LoginContext instantiates a new Subject.
* <p>
* </ul>
*
* <li> {@code Configuration}
* <ul>
* <li> If the constructor has a Configuration
* input parameter and the caller specifies a non-null Configuration,
* the LoginContext uses the caller-specified Configuration.
* <p>
* If the constructor does <b>not</b> have a Configuration
* input parameter, or if the caller specifies a {@code null}
* Configuration object, the constructor uses the following call to
* get the installed Configuration:
* <pre>
* config = Configuration.getConfiguration();
* </pre>
* For both cases,
* the <i>name</i> argument given to the constructor is passed to the
* {@code Configuration.getAppConfigurationEntry} method.
* If the Configuration has no entries for the specified <i>name</i>,
* then the {@code LoginContext} calls
* {@code getAppConfigurationEntry} with the name, "<i>other</i>"
* (the default entry name). If there is no entry for "<i>other</i>",
* then a {@code LoginException} is thrown.
*
* <li> When LoginContext uses the installed Configuration, the caller
* requires the createLoginContext.<em>name</em> and possibly
* createLoginContext.other AuthPermissions. Furthermore, the
* LoginContext will invoke configured modules from within an
* {@code AccessController.doPrivileged} call so that modules that
* perform security-sensitive tasks (such as connecting to remote hosts,
* and updating the Subject) will require the respective permissions, but
* the callers of the LoginContext will not require those permissions.
*
* <li> When LoginContext uses a caller-specified Configuration, the caller
* does not require any createLoginContext AuthPermission. The LoginContext
* saves the {@code AccessControlContext} for the caller,
* and invokes the configured modules from within an
* {@code AccessController.doPrivileged} call constrained by that context.
* This means the caller context (stored when the LoginContext was created)
* must have sufficient permissions to perform any security-sensitive tasks
* that the modules may perform.
* <p>
* </ul>
*
* <li> {@code CallbackHandler}
* <ul>
* <li> If the constructor has a CallbackHandler
* input parameter, the LoginContext uses the caller-specified
* CallbackHandler object.
*
* <li> If the constructor does <b>not</b> have a CallbackHandler
* input parameter, or if the caller specifies a {@code null}
* CallbackHandler object (and a {@code null} value is permitted),
* the LoginContext queries the
* {@code auth.login.defaultCallbackHandler} security property for the
* fully qualified class name of a default handler
* implementation. If the security property is not set,
* then the underlying modules will not have a
* CallbackHandler for use in communicating
* with users. The caller thus assumes that the configured
* modules have alternative means for authenticating the user.
*
*
* <li> When the LoginContext uses the installed Configuration (instead of
* a caller-specified Configuration, see above),
* then this LoginContext must wrap any
* caller-specified or default CallbackHandler implementation
* in a new CallbackHandler implementation
* whose {@code handle} method implementation invokes the
* specified CallbackHandler's {@code handle} method in a
* {@code java.security.AccessController.doPrivileged} call
* constrained by the caller's current {@code AccessControlContext}.
* </ul>
* </ol>
*
* @see java.security.Security
* @see javax.security.auth.AuthPermission
* @see javax.security.auth.Subject
* @see javax.security.auth.callback.CallbackHandler
* @see javax.security.auth.login.Configuration
* @see javax.security.auth.spi.LoginModule
* @see java.security.Security security properties
*/
public class LoginContext {
private static final String INIT_METHOD = "initialize";
private static final String LOGIN_METHOD = "login";
private static final String COMMIT_METHOD = "commit";
private static final String ABORT_METHOD = "abort";
private static final String LOGOUT_METHOD = "logout";
private static final String OTHER = "other";
private static final String DEFAULT_HANDLER =
"auth.login.defaultCallbackHandler";
private Subject subject = null;
private boolean subjectProvided = false;
private boolean loginSucceeded = false;
private CallbackHandler callbackHandler;
private Map<String,?> state = new HashMap<String,Object>();
private Configuration config;
private AccessControlContext creatorAcc = null; // customized config only
private ModuleInfo[] moduleStack;
private ClassLoader contextClassLoader = null;
private static final Class<?>[] PARAMS = { };
// state saved in the event a user-specified asynchronous exception
// was specified and thrown
private int moduleIndex = 0;
private LoginException firstError = null;
private LoginException firstRequiredError = null;
private boolean success = false;
private static final sun.security.util.Debug debug =
sun.security.util.Debug.getInstance("logincontext", "\t[LoginContext]");
private void init(String name) throws LoginException {
SecurityManager sm = System.getSecurityManager();
if (sm != null && creatorAcc == null) {
sm.checkPermission(new AuthPermission
("createLoginContext." + name));
}
if (name == null)
throw new LoginException
(ResourcesMgr.getString("Invalid.null.input.name"));
// get the Configuration
if (config == null) {
config = java.security.AccessController.doPrivileged
(new java.security.PrivilegedAction<Configuration>() {
public Configuration run() {
return Configuration.getConfiguration();
}
});
}
// get the LoginModules configured for this application
AppConfigurationEntry[] entries = config.getAppConfigurationEntry(name);
if (entries == null) {
if (sm != null && creatorAcc == null) {
sm.checkPermission(new AuthPermission
("createLoginContext." + OTHER));
}
entries = config.getAppConfigurationEntry(OTHER);
if (entries == null) {
MessageFormat form = new MessageFormat(ResourcesMgr.getString
("No.LoginModules.configured.for.name"));
Object[] source = {name};
throw new LoginException(form.format(source));
}
}
moduleStack = new ModuleInfo[entries.length];
for (int i = 0; i < entries.length; i++) {
// clone returned array
moduleStack[i] = new ModuleInfo
(new AppConfigurationEntry
(entries[i].getLoginModuleName(),
entries[i].getControlFlag(),
entries[i].getOptions()),
null);
}
contextClassLoader = java.security.AccessController.doPrivileged
(new java.security.PrivilegedAction<ClassLoader>() {
public ClassLoader run() {
ClassLoader loader =
Thread.currentThread().getContextClassLoader();
if (loader == null) {
// Don't use bootstrap class loader directly to ensure
// proper package access control!
loader = ClassLoader.getSystemClassLoader();
}
return loader;
}
});
}
private void loadDefaultCallbackHandler() throws LoginException {
// get the default handler class
try {
final ClassLoader finalLoader = contextClassLoader;
this.callbackHandler = java.security.AccessController.doPrivileged(
new java.security.PrivilegedExceptionAction<CallbackHandler>() {
public CallbackHandler run() throws Exception {
String defaultHandler = java.security.Security.getProperty
(DEFAULT_HANDLER);
if (defaultHandler == null || defaultHandler.length() == 0)
return null;
Class<? extends CallbackHandler> c = Class.forName(
defaultHandler, true,
finalLoader).asSubclass(CallbackHandler.class);
return c.newInstance();
}
});
} catch (java.security.PrivilegedActionException pae) {
throw new LoginException(pae.getException().toString());
}
// secure it with the caller's ACC
if (this.callbackHandler != null && creatorAcc == null) {
this.callbackHandler = new SecureCallbackHandler
(java.security.AccessController.getContext(),
this.callbackHandler);
}
}
/**
* Instantiate a new {@code LoginContext} object with a name.
*
* @param name the name used as the index into the
* {@code Configuration}.
*
* @exception LoginException if the caller-specified {@code name}
* does not appear in the {@code Configuration}
* and there is no {@code Configuration} entry
* for "<i>other</i>", or if the
* <i>auth.login.defaultCallbackHandler</i>
* security property was set, but the implementation
* class could not be loaded.
* <p>
* @exception SecurityException if a SecurityManager is set and
* the caller does not have
* AuthPermission("createLoginContext.<i>name</i>"),
* or if a configuration entry for <i>name</i> does not exist and
* the caller does not additionally have
* AuthPermission("createLoginContext.other")
*/
public LoginContext(String name) throws LoginException {
init(name);
loadDefaultCallbackHandler();
}
/**
* Instantiate a new {@code LoginContext} object with a name
* and a {@code Subject} object.
*
* <p>
*
* @param name the name used as the index into the
* {@code Configuration}. <p>
*
* @param subject the {@code Subject} to authenticate.
*
* @exception LoginException if the caller-specified {@code name}
* does not appear in the {@code Configuration}
* and there is no {@code Configuration} entry
* for "<i>other</i>", if the caller-specified {@code subject}
* is {@code null}, or if the
* <i>auth.login.defaultCallbackHandler</i>
* security property was set, but the implementation
* class could not be loaded.
* <p>
* @exception SecurityException if a SecurityManager is set and
* the caller does not have
* AuthPermission("createLoginContext.<i>name</i>"),
* or if a configuration entry for <i>name</i> does not exist and
* the caller does not additionally have
* AuthPermission("createLoginContext.other")
*/
public LoginContext(String name, Subject subject)
throws LoginException {
init(name);
if (subject == null)
throw new LoginException
(ResourcesMgr.getString("invalid.null.Subject.provided"));
this.subject = subject;
subjectProvided = true;
loadDefaultCallbackHandler();
}
/**
* Instantiate a new {@code LoginContext} object with a name
* and a {@code CallbackHandler} object.
*
* <p>
*
* @param name the name used as the index into the
* {@code Configuration}. <p>
*
* @param callbackHandler the {@code CallbackHandler} object used by
* LoginModules to communicate with the user.
*
* @exception LoginException if the caller-specified {@code name}
* does not appear in the {@code Configuration}
* and there is no {@code Configuration} entry
* for "<i>other</i>", or if the caller-specified
* {@code callbackHandler} is {@code null}.
* <p>
* @exception SecurityException if a SecurityManager is set and
* the caller does not have
* AuthPermission("createLoginContext.<i>name</i>"),
* or if a configuration entry for <i>name</i> does not exist and
* the caller does not additionally have
* AuthPermission("createLoginContext.other")
*/
public LoginContext(String name, CallbackHandler callbackHandler)
throws LoginException {
init(name);
if (callbackHandler == null)
throw new LoginException(ResourcesMgr.getString
("invalid.null.CallbackHandler.provided"));
this.callbackHandler = new SecureCallbackHandler
(java.security.AccessController.getContext(),
callbackHandler);
}
/**
* Instantiate a new {@code LoginContext} object with a name,
* a {@code Subject} to be authenticated, and a
* {@code CallbackHandler} object.
*
* <p>
*
* @param name the name used as the index into the
* {@code Configuration}. <p>
*
* @param subject the {@code Subject} to authenticate. <p>
*
* @param callbackHandler the {@code CallbackHandler} object used by
* LoginModules to communicate with the user.
*
* @exception LoginException if the caller-specified {@code name}
* does not appear in the {@code Configuration}
* and there is no {@code Configuration} entry
* for "<i>other</i>", or if the caller-specified
* {@code subject} is {@code null},
* or if the caller-specified
* {@code callbackHandler} is {@code null}.
* <p>
* @exception SecurityException if a SecurityManager is set and
* the caller does not have
* AuthPermission("createLoginContext.<i>name</i>"),
* or if a configuration entry for <i>name</i> does not exist and
* the caller does not additionally have
* AuthPermission("createLoginContext.other")
*/
public LoginContext(String name, Subject subject,
CallbackHandler callbackHandler) throws LoginException {
this(name, subject);
if (callbackHandler == null)
throw new LoginException(ResourcesMgr.getString
("invalid.null.CallbackHandler.provided"));
this.callbackHandler = new SecureCallbackHandler
(java.security.AccessController.getContext(),
callbackHandler);
}
/**
* Instantiate a new {@code LoginContext} object with a name,
* a {@code Subject} to be authenticated,
* a {@code CallbackHandler} object, and a login
* {@code Configuration}.
*
* <p>
*
* @param name the name used as the index into the caller-specified
* {@code Configuration}. <p>
*
* @param subject the {@code Subject} to authenticate,
* or {@code null}. <p>
*
* @param callbackHandler the {@code CallbackHandler} object used by
* LoginModules to communicate with the user, or {@code null}.
* <p>
*
* @param config the {@code Configuration} that lists the
* login modules to be called to perform the authentication,
* or {@code null}.
*
* @exception LoginException if the caller-specified {@code name}
* does not appear in the {@code Configuration}
* and there is no {@code Configuration} entry
* for "<i>other</i>".
* <p>
* @exception SecurityException if a SecurityManager is set,
* <i>config</i> is {@code null},
* and either the caller does not have
* AuthPermission("createLoginContext.<i>name</i>"),
* or if a configuration entry for <i>name</i> does not exist and
* the caller does not additionally have
* AuthPermission("createLoginContext.other")
*
* @since 1.5
*/
public LoginContext(String name, Subject subject,
CallbackHandler callbackHandler,
Configuration config) throws LoginException {
this.config = config;
if (config != null) {
creatorAcc = java.security.AccessController.getContext();
}
init(name);
if (subject != null) {
this.subject = subject;
subjectProvided = true;
}
if (callbackHandler == null) {
loadDefaultCallbackHandler();
} else if (creatorAcc == null) {
this.callbackHandler = new SecureCallbackHandler
(java.security.AccessController.getContext(),
callbackHandler);
} else {
this.callbackHandler = callbackHandler;
}
}
/**
* Perform the authentication.
*
* <p> This method invokes the {@code login} method for each
* LoginModule configured for the <i>name</i> specified to the
* {@code LoginContext} constructor, as determined by the login
* {@code Configuration}. Each {@code LoginModule}
* then performs its respective type of authentication
* (username/password, smart card pin verification, etc.).
*
* <p> This method completes a 2-phase authentication process by
* calling each configured LoginModule's {@code commit} method
* if the overall authentication succeeded (the relevant REQUIRED,
* REQUISITE, SUFFICIENT, and OPTIONAL LoginModules succeeded),
* or by calling each configured LoginModule's {@code abort} method
* if the overall authentication failed. If authentication succeeded,
* each successful LoginModule's {@code commit} method associates
* the relevant Principals and Credentials with the {@code Subject}.
* If authentication failed, each LoginModule's {@code abort} method
* removes/destroys any previously stored state.
*
* <p> If the {@code commit} phase of the authentication process
* fails, then the overall authentication fails and this method
* invokes the {@code abort} method for each configured
* {@code LoginModule}.
*
* <p> If the {@code abort} phase
* fails for any reason, then this method propagates the
* original exception thrown either during the {@code login} phase
* or the {@code commit} phase. In either case, the overall
* authentication fails.
*
* <p> In the case where multiple LoginModules fail,
* this method propagates the exception raised by the first
* {@code LoginModule} which failed.
*
* <p> Note that if this method enters the {@code abort} phase
* (either the {@code login} or {@code commit} phase failed),
* this method invokes all LoginModules configured for the
* application regardless of their respective {@code Configuration}
* flag parameters. Essentially this means that {@code Requisite}
* and {@code Sufficient} semantics are ignored during the
* {@code abort} phase. This guarantees that proper cleanup
* and state restoration can take place.
*
* <p>
*
* @exception LoginException if the authentication fails.
*/
public void login() throws LoginException {
loginSucceeded = false;
if (subject == null) {
subject = new Subject();
}
try {
// module invoked in doPrivileged
invokePriv(LOGIN_METHOD);
invokePriv(COMMIT_METHOD);
loginSucceeded = true;
} catch (LoginException le) {
try {
invokePriv(ABORT_METHOD);
} catch (LoginException le2) {
throw le;
}
throw le;
}
}
/**
* Logout the {@code Subject}.
*
* <p> This method invokes the {@code logout} method for each
* {@code LoginModule} configured for this {@code LoginContext}.
* Each {@code LoginModule} performs its respective logout procedure
* which may include removing/destroying
* {@code Principal} and {@code Credential} information
* from the {@code Subject} and state cleanup.
*
* <p> Note that this method invokes all LoginModules configured for the
* application regardless of their respective
* {@code Configuration} flag parameters. Essentially this means
* that {@code Requisite} and {@code Sufficient} semantics are
* ignored for this method. This guarantees that proper cleanup
* and state restoration can take place.
*
* <p>
*
* @exception LoginException if the logout fails.
*/
public void logout() throws LoginException {
if (subject == null) {
throw new LoginException(ResourcesMgr.getString
("null.subject.logout.called.before.login"));
}
// module invoked in doPrivileged
invokePriv(LOGOUT_METHOD);
}
/**
* Return the authenticated Subject.
*
* <p>
*
* @return the authenticated Subject. If the caller specified a
* Subject to this LoginContext's constructor,
* this method returns the caller-specified Subject.
* If a Subject was not specified and authentication succeeds,
* this method returns the Subject instantiated and used for
* authentication by this LoginContext.
* If a Subject was not specified, and authentication fails or
* has not been attempted, this method returns null.
*/
public Subject getSubject() {
if (!loginSucceeded && !subjectProvided)
return null;
return subject;
}
private void clearState() {
moduleIndex = 0;
firstError = null;
firstRequiredError = null;
success = false;
}
private void throwException(LoginException originalError, LoginException le)
throws LoginException {
// first clear state
clearState();
// throw the exception
LoginException error = (originalError != null) ? originalError : le;
throw error;
}
/**
* Invokes the login, commit, and logout methods
* from a LoginModule inside a doPrivileged block restricted
* by creatorAcc (may be null).
*
* This version is called if the caller did not instantiate
* the LoginContext with a Configuration object.
*/
private void invokePriv(final String methodName) throws LoginException {
try {
java.security.AccessController.doPrivileged
(new java.security.PrivilegedExceptionAction<Void>() {
public Void run() throws LoginException {
invoke(methodName);
return null;
}
}, creatorAcc);
} catch (java.security.PrivilegedActionException pae) {
throw (LoginException)pae.getException();
}
}
private void invoke(String methodName) throws LoginException {
// start at moduleIndex
// - this can only be non-zero if methodName is LOGIN_METHOD
for (int i = moduleIndex; i < moduleStack.length; i++, moduleIndex++) {
try {
int mIndex = 0;
Method[] methods = null;
if (moduleStack[i].module != null) {
methods = moduleStack[i].module.getClass().getMethods();
} else {
// instantiate the LoginModule
//
// Allow any object to be a LoginModule as long as it
// conforms to the interface.
Class<?> c = Class.forName(
moduleStack[i].entry.getLoginModuleName(),
true,
contextClassLoader);
Constructor<?> constructor = c.getConstructor(PARAMS);
Object[] args = { };
moduleStack[i].module = constructor.newInstance(args);
// call the LoginModule's initialize method
methods = moduleStack[i].module.getClass().getMethods();
for (mIndex = 0; mIndex < methods.length; mIndex++) {
if (methods[mIndex].getName().equals(INIT_METHOD)) {
break;
}
}
Object[] initArgs = {subject,
callbackHandler,
state,
moduleStack[i].entry.getOptions() };
// invoke the LoginModule initialize method
//
// Throws ArrayIndexOutOfBoundsException if no such
// method defined. May improve to use LoginException in
// the future.
methods[mIndex].invoke(moduleStack[i].module, initArgs);
}
// find the requested method in the LoginModule
for (mIndex = 0; mIndex < methods.length; mIndex++) {
if (methods[mIndex].getName().equals(methodName)) {
break;
}
}
// set up the arguments to be passed to the LoginModule method
Object[] args = { };
// invoke the LoginModule method
//
// Throws ArrayIndexOutOfBoundsException if no such
// method defined. May improve to use LoginException in
// the future.
boolean status = ((Boolean)methods[mIndex].invoke
(moduleStack[i].module, args)).booleanValue();
if (status == true) {
// if SUFFICIENT, return if no prior REQUIRED errors
if (!methodName.equals(ABORT_METHOD) &&
!methodName.equals(LOGOUT_METHOD) &&
moduleStack[i].entry.getControlFlag() ==
AppConfigurationEntry.LoginModuleControlFlag.SUFFICIENT &&
firstRequiredError == null) {
// clear state
clearState();
if (debug != null)
debug.println(methodName + " SUFFICIENT success");
return;
}
if (debug != null)
debug.println(methodName + " success");
success = true;
} else {
if (debug != null)
debug.println(methodName + " ignored");
}
} catch (NoSuchMethodException nsme) {
MessageFormat form = new MessageFormat(ResourcesMgr.getString
("unable.to.instantiate.LoginModule.module.because.it.does.not.provide.a.no.argument.constructor"));
Object[] source = {moduleStack[i].entry.getLoginModuleName()};
throwException(null, new LoginException(form.format(source)));
} catch (InstantiationException ie) {
throwException(null, new LoginException(ResourcesMgr.getString
("unable.to.instantiate.LoginModule.") +
ie.getMessage()));
} catch (ClassNotFoundException cnfe) {
throwException(null, new LoginException(ResourcesMgr.getString
("unable.to.find.LoginModule.class.") +
cnfe.getMessage()));
} catch (IllegalAccessException iae) {
throwException(null, new LoginException(ResourcesMgr.getString
("unable.to.access.LoginModule.") +
iae.getMessage()));
} catch (InvocationTargetException ite) {
// failure cases
LoginException le;
if (ite.getCause() instanceof PendingException &&
methodName.equals(LOGIN_METHOD)) {
// XXX
//
// if a module's LOGIN_METHOD threw a PendingException
// then immediately throw it.
//
// when LoginContext is called again,
// the module that threw the exception is invoked first
// (the module list is not invoked from the start).
// previously thrown exception state is still present.
//
// it is assumed that the module which threw
// the exception can have its
// LOGIN_METHOD invoked twice in a row
// without any commit/abort in between.
//
// in all cases when LoginContext returns
// (either via natural return or by throwing an exception)
// we need to call clearState before returning.
// the only time that is not true is in this case -
// do not call throwException here.
throw (PendingException)ite.getCause();
} else if (ite.getCause() instanceof LoginException) {
le = (LoginException)ite.getCause();
} else if (ite.getCause() instanceof SecurityException) {
// do not want privacy leak
// (e.g., sensitive file path in exception msg)
le = new LoginException("Security Exception");
le.initCause(new SecurityException());
if (debug != null) {
debug.println
("original security exception with detail msg " +
"replaced by new exception with empty detail msg");
debug.println("original security exception: " +
ite.getCause().toString());
}
} else {
// capture an unexpected LoginModule exception
java.io.StringWriter sw = new java.io.StringWriter();
ite.getCause().printStackTrace
(new java.io.PrintWriter(sw));
sw.flush();
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