JDK8/Java8源码在线阅读
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package javax.security.auth.login;
import javax.security.auth.AuthPermission;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedExceptionAction;
import java.security.PrivilegedActionException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Provider;
import java.security.Security;
import java.util.Objects;
import sun.security.jca.GetInstance;
/**
* A Configuration object is responsible for specifying which LoginModules
* should be used for a particular application, and in what order the
* LoginModules should be invoked.
*
* <p> A login configuration contains the following information.
* Note that this example only represents the default syntax for the
* {@code Configuration}. Subclass implementations of this class
* may implement alternative syntaxes and may retrieve the
* {@code Configuration} from any source such as files, databases,
* or servers.
*
* <pre>
* Name {
* ModuleClass Flag ModuleOptions;
* ModuleClass Flag ModuleOptions;
* ModuleClass Flag ModuleOptions;
* };
* Name {
* ModuleClass Flag ModuleOptions;
* ModuleClass Flag ModuleOptions;
* };
* other {
* ModuleClass Flag ModuleOptions;
* ModuleClass Flag ModuleOptions;
* };
* </pre>
*
* <p> Each entry in the {@code Configuration} is indexed via an
* application name, <i>Name</i>, and contains a list of
* LoginModules configured for that application. Each {@code LoginModule}
* is specified via its fully qualified class name.
* Authentication proceeds down the module list in the exact order specified.
* If an application does not have a specific entry,
* it defaults to the specific entry for "<i>other</i>".
*
* <p> The <i>Flag</i> value controls the overall behavior as authentication
* proceeds down the stack. The following represents a description of the
* valid values for <i>Flag</i> and their respective semantics:
*
* <pre>
* 1) Required - The {@code LoginModule} is required to succeed.
* If it succeeds or fails, authentication still continues
* to proceed down the {@code LoginModule} list.
*
* 2) Requisite - The {@code LoginModule} is required to succeed.
* If it succeeds, authentication continues down the
* {@code LoginModule} list. If it fails,
* control immediately returns to the application
* (authentication does not proceed down the
* {@code LoginModule} list).
*
* 3) Sufficient - The {@code LoginModule} is not required to
* succeed. If it does succeed, control immediately
* returns to the application (authentication does not
* proceed down the {@code LoginModule} list).
* If it fails, authentication continues down the
* {@code LoginModule} list.
*
* 4) Optional - The {@code LoginModule} is not required to
* succeed. If it succeeds or fails,
* authentication still continues to proceed down the
* {@code LoginModule} list.
* </pre>
*
* <p> The overall authentication succeeds only if all <i>Required</i> and
* <i>Requisite</i> LoginModules succeed. If a <i>Sufficient</i>
* {@code LoginModule} is configured and succeeds,
* then only the <i>Required</i> and <i>Requisite</i> LoginModules prior to
* that <i>Sufficient</i> {@code LoginModule} need to have succeeded for
* the overall authentication to succeed. If no <i>Required</i> or
* <i>Requisite</i> LoginModules are configured for an application,
* then at least one <i>Sufficient</i> or <i>Optional</i>
* {@code LoginModule} must succeed.
*
* <p> <i>ModuleOptions</i> is a space separated list of
* {@code LoginModule}-specific values which are passed directly to
* the underlying LoginModules. Options are defined by the
* {@code LoginModule} itself, and control the behavior within it.
* For example, a {@code LoginModule} may define options to support
* debugging/testing capabilities. The correct way to specify options in the
* {@code Configuration} is by using the following key-value pairing:
* <i>debug="true"</i>. The key and value should be separated by an
* 'equals' symbol, and the value should be surrounded by double quotes.
* If a String in the form, ${system.property}, occurs in the value,
* it will be expanded to the value of the system property.
* Note that there is no limit to the number of
* options a {@code LoginModule} may define.
*
* <p> The following represents an example {@code Configuration} entry
* based on the syntax above:
*
* <pre>
* Login {
* com.sun.security.auth.module.UnixLoginModule required;
* com.sun.security.auth.module.Krb5LoginModule optional
* useTicketCache="true"
* ticketCache="${user.home}${/}tickets";
* };
* </pre>
*
* <p> This {@code Configuration} specifies that an application named,
* "Login", requires users to first authenticate to the
* <i>com.sun.security.auth.module.UnixLoginModule</i>, which is
* required to succeed. Even if the <i>UnixLoginModule</i>
* authentication fails, the
* <i>com.sun.security.auth.module.Krb5LoginModule</i>
* still gets invoked. This helps hide the source of failure.
* Since the <i>Krb5LoginModule</i> is <i>Optional</i>, the overall
* authentication succeeds only if the <i>UnixLoginModule</i>
* (<i>Required</i>) succeeds.
*
* <p> Also note that the LoginModule-specific options,
* <i>useTicketCache="true"</i> and
* <i>ticketCache=${user.home}${/}tickets"</i>,
* are passed to the <i>Krb5LoginModule</i>.
* These options instruct the <i>Krb5LoginModule</i> to
* use the ticket cache at the specified location.
* The system properties, <i>user.home</i> and <i>/</i>
* (file.separator), are expanded to their respective values.
*
* <p> There is only one Configuration object installed in the runtime at any
* given time. A Configuration object can be installed by calling the
* {@code setConfiguration} method. The installed Configuration object
* can be obtained by calling the {@code getConfiguration} method.
*
* <p> If no Configuration object has been installed in the runtime, a call to
* {@code getConfiguration} installs an instance of the default
* Configuration implementation (a default subclass implementation of this
* abstract class).
* The default Configuration implementation can be changed by setting the value
* of the {@code login.configuration.provider} security property to the fully
* qualified name of the desired Configuration subclass implementation.
*
* <p> Application code can directly subclass Configuration to provide a custom
* implementation. In addition, an instance of a Configuration object can be
* constructed by invoking one of the {@code getInstance} factory methods
* with a standard type. The default policy type is "JavaLoginConfig".
* See the Configuration section in the <a href=
* "{@docRoot}/../technotes/guides/security/StandardNames.html#Configuration">
* Java Cryptography Architecture Standard Algorithm Name Documentation</a>
* for a list of standard Configuration types.
*
* @see javax.security.auth.login.LoginContext
* @see java.security.Security security properties
*/
public abstract class Configuration {
private static Configuration configuration;
private final java.security.AccessControlContext acc =
java.security.AccessController.getContext();
private static void checkPermission(String type) {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(new AuthPermission
("createLoginConfiguration." + type));
}
}
/**
* Sole constructor. (For invocation by subclass constructors, typically
* implicit.)
*/
protected Configuration() { }
/**
* Get the installed login Configuration.
*
* <p>
*
* @return the login Configuration. If a Configuration object was set
* via the {@code Configuration.setConfiguration} method,
* then that object is returned. Otherwise, a default
* Configuration object is returned.
*
* @exception SecurityException if the caller does not have permission
* to retrieve the Configuration.
*
* @see #setConfiguration
*/
public static Configuration getConfiguration() {
SecurityManager sm = System.getSecurityManager();
if (sm != null)
sm.checkPermission(new AuthPermission("getLoginConfiguration"));
synchronized (Configuration.class) {
if (configuration == null) {
String config_class = null;
config_class = AccessController.doPrivileged
(new PrivilegedAction<String>() {
public String run() {
return java.security.Security.getProperty
("login.configuration.provider");
}
});
if (config_class == null) {
config_class = "sun.security.provider.ConfigFile";
}
try {
final String finalClass = config_class;
Configuration untrustedImpl = AccessController.doPrivileged(
new PrivilegedExceptionAction<Configuration>() {
public Configuration run() throws ClassNotFoundException,
InstantiationException,
IllegalAccessException {
Class<? extends Configuration> implClass = Class.forName(
finalClass, false,
Thread.currentThread().getContextClassLoader()
).asSubclass(Configuration.class);
return implClass.newInstance();
}
});
AccessController.doPrivileged(
new PrivilegedExceptionAction<Void>() {
public Void run() {
setConfiguration(untrustedImpl);
return null;
}
}, Objects.requireNonNull(untrustedImpl.acc)
);
} catch (PrivilegedActionException e) {
Exception ee = e.getException();
if (ee instanceof InstantiationException) {
throw (SecurityException) new
SecurityException
("Configuration error:" +
ee.getCause().getMessage() +
"\n").initCause(ee.getCause());
} else {
throw (SecurityException) new
SecurityException
("Configuration error: " +
ee.toString() +
"\n").initCause(ee);
}
}
}
return configuration;
}
}
/**
* Set the login {@code Configuration}.
*
* <p>
*
* @param configuration the new {@code Configuration}
*
* @exception SecurityException if the current thread does not have
* Permission to set the {@code Configuration}.
*
* @see #getConfiguration
*/
public static void setConfiguration(Configuration configuration) {
SecurityManager sm = System.getSecurityManager();
if (sm != null)
sm.checkPermission(new AuthPermission("setLoginConfiguration"));
Configuration.configuration = configuration;
}
/**
* Returns a Configuration object of the specified type.
*
* <p> This method traverses the list of registered security providers,
* starting with the most preferred Provider.
* A new Configuration object encapsulating the
* ConfigurationSpi implementation from the first
* Provider that supports the specified type is returned.
*
* <p> Note that the list of registered providers may be retrieved via
* the {@link Security#getProviders() Security.getProviders()} method.
*
* @param type the specified Configuration type. See the Configuration
* section in the <a href=
* "{@docRoot}/../technotes/guides/security/StandardNames.html#Configuration">
* Java Cryptography Architecture Standard Algorithm Name
* Documentation</a> for a list of standard Configuration types.
*
* @param params parameters for the Configuration, which may be null.
*
* @return the new Configuration object.
*
* @exception SecurityException if the caller does not have permission
* to get a Configuration instance for the specified type.
*
* @exception NullPointerException if the specified type is null.
*
* @exception IllegalArgumentException if the specified parameters
* are not understood by the ConfigurationSpi implementation
* from the selected Provider.
*
* @exception NoSuchAlgorithmException if no Provider supports a
* ConfigurationSpi implementation for the specified type.
*
* @see Provider
* @since 1.6
*/
public static Configuration getInstance(String type,
Configuration.Parameters params)
throws NoSuchAlgorithmException {
checkPermission(type);
try {
GetInstance.Instance instance = GetInstance.getInstance
("Configuration",
ConfigurationSpi.class,
type,
params);
return new ConfigDelegate((ConfigurationSpi)instance.impl,
instance.provider,
type,
params);
} catch (NoSuchAlgorithmException nsae) {
return handleException (nsae);
}
}
/**
* Returns a Configuration object of the specified type.
*
* <p> A new Configuration object encapsulating the
* ConfigurationSpi implementation from the specified provider
* is returned. The specified provider must be registered
* in the provider list.
*
* <p> Note that the list of registered providers may be retrieved via
* the {@link Security#getProviders() Security.getProviders()} method.
*
* @param type the specified Configuration type. See the Configuration
* section in the <a href=
* "{@docRoot}/../technotes/guides/security/StandardNames.html#Configuration">
* Java Cryptography Architecture Standard Algorithm Name
* Documentation</a> for a list of standard Configuration types.
*
* @param params parameters for the Configuration, which may be null.
*
* @param provider the provider.
*
* @return the new Configuration object.
*
* @exception SecurityException if the caller does not have permission
* to get a Configuration instance for the specified type.
*
* @exception NullPointerException if the specified type is null.
*
* @exception IllegalArgumentException if the specified provider
* is null or empty,
* or if the specified parameters are not understood by
* the ConfigurationSpi implementation from the specified provider.
*
* @exception NoSuchProviderException if the specified provider is not
* registered in the security provider list.
*
* @exception NoSuchAlgorithmException if the specified provider does not
* support a ConfigurationSpi implementation for the specified
* type.
*
* @see Provider
* @since 1.6
*/
public static Configuration getInstance(String type,
Configuration.Parameters params,
String provider)
throws NoSuchProviderException, NoSuchAlgorithmException {
if (provider == null || provider.length() == 0) {
throw new IllegalArgumentException("missing provider");
}
checkPermission(type);
try {
GetInstance.Instance instance = GetInstance.getInstance
("Configuration",
ConfigurationSpi.class,
type,
params,
provider);
return new ConfigDelegate((ConfigurationSpi)instance.impl,
instance.provider,
type,
params);
} catch (NoSuchAlgorithmException nsae) {
return handleException (nsae);
}
}
/**
* Returns a Configuration object of the specified type.
*
* <p> A new Configuration object encapsulating the
* ConfigurationSpi implementation from the specified Provider
* object is returned. Note that the specified Provider object
* does not have to be registered in the provider list.
*
* @param type the specified Configuration type. See the Configuration
* section in the <a href=
* "{@docRoot}/../technotes/guides/security/StandardNames.html#Configuration">
* Java Cryptography Architecture Standard Algorithm Name
* Documentation</a> for a list of standard Configuration types.
*
* @param params parameters for the Configuration, which may be null.
*
* @param provider the Provider.
*
* @return the new Configuration object.
*
* @exception SecurityException if the caller does not have permission
* to get a Configuration instance for the specified type.
*
* @exception NullPointerException if the specified type is null.
*
* @exception IllegalArgumentException if the specified Provider is null,
* or if the specified parameters are not understood by
* the ConfigurationSpi implementation from the specified Provider.
*
* @exception NoSuchAlgorithmException if the specified Provider does not
* support a ConfigurationSpi implementation for the specified
* type.
*
* @see Provider
* @since 1.6
*/
public static Configuration getInstance(String type,
Configuration.Parameters params,
Provider provider)
throws NoSuchAlgorithmException {
if (provider == null) {
throw new IllegalArgumentException("missing provider");
}
checkPermission(type);
try {
GetInstance.Instance instance = GetInstance.getInstance
("Configuration",
ConfigurationSpi.class,
type,
params,
provider);
return new ConfigDelegate((ConfigurationSpi)instance.impl,
instance.provider,
type,
params);
} catch (NoSuchAlgorithmException nsae) {
return handleException (nsae);
}
}
private static Configuration handleException(NoSuchAlgorithmException nsae)
throws NoSuchAlgorithmException {
Throwable cause = nsae.getCause();
if (cause instanceof IllegalArgumentException) {
throw (IllegalArgumentException)cause;
}
throw nsae;
}
/**
* Return the Provider of this Configuration.
*
* <p> This Configuration instance will only have a Provider if it
* was obtained via a call to {@code Configuration.getInstance}.
* Otherwise this method returns null.
*
* @return the Provider of this Configuration, or null.
*
* @since 1.6
*/
public Provider getProvider() {
return null;
}
/**
* Return the type of this Configuration.
*
* <p> This Configuration instance will only have a type if it
* was obtained via a call to {@code Configuration.getInstance}.
* Otherwise this method returns null.
*
* @return the type of this Configuration, or null.
*
* @since 1.6
*/
public String getType() {
return null;
}
/**
* Return Configuration parameters.
*
* <p> This Configuration instance will only have parameters if it
* was obtained via a call to {@code Configuration.getInstance}.
* Otherwise this method returns null.
*
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