JDK8/Java8源码在线阅读
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*
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* accompanied this code).
*
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package javax.security.auth;
import java.util.*;
import java.io.*;
import java.lang.reflect.*;
import java.text.MessageFormat;
import java.security.AccessController;
import java.security.AccessControlContext;
import java.security.DomainCombiner;
import java.security.Permission;
import java.security.PermissionCollection;
import java.security.Principal;
import java.security.PrivilegedAction;
import java.security.PrivilegedExceptionAction;
import java.security.PrivilegedActionException;
import java.security.ProtectionDomain;
import sun.security.util.ResourcesMgr;
/**
* <p> A {@code Subject} represents a grouping of related information
* for a single entity, such as a person.
* Such information includes the Subject's identities as well as
* its security-related attributes
* (passwords and cryptographic keys, for example).
*
* <p> Subjects may potentially have multiple identities.
* Each identity is represented as a {@code Principal}
* within the {@code Subject}. Principals simply bind names to a
* {@code Subject}. For example, a {@code Subject} that happens
* to be a person, Alice, might have two Principals:
* one which binds "Alice Bar", the name on her driver license,
* to the {@code Subject}, and another which binds,
* "999-99-9999", the number on her student identification card,
* to the {@code Subject}. Both Principals refer to the same
* {@code Subject} even though each has a different name.
*
* <p> A {@code Subject} may also own security-related attributes,
* which are referred to as credentials.
* Sensitive credentials that require special protection, such as
* private cryptographic keys, are stored within a private credential
* {@code Set}. Credentials intended to be shared, such as
* public key certificates or Kerberos server tickets are stored
* within a public credential {@code Set}. Different permissions
* are required to access and modify the different credential Sets.
*
* <p> To retrieve all the Principals associated with a {@code Subject},
* invoke the {@code getPrincipals} method. To retrieve
* all the public or private credentials belonging to a {@code Subject},
* invoke the {@code getPublicCredentials} method or
* {@code getPrivateCredentials} method, respectively.
* To modify the returned {@code Set} of Principals and credentials,
* use the methods defined in the {@code Set} class.
* For example:
* <pre>
* Subject subject;
* Principal principal;
* Object credential;
*
* // add a Principal and credential to the Subject
* subject.getPrincipals().add(principal);
* subject.getPublicCredentials().add(credential);
* </pre>
*
* <p> This {@code Subject} class implements {@code Serializable}.
* While the Principals associated with the {@code Subject} are serialized,
* the credentials associated with the {@code Subject} are not.
* Note that the {@code java.security.Principal} class
* does not implement {@code Serializable}. Therefore all concrete
* {@code Principal} implementations associated with Subjects
* must implement {@code Serializable}.
*
* @see java.security.Principal
* @see java.security.DomainCombiner
*/
public final class Subject implements java.io.Serializable {
private static final long serialVersionUID = -8308522755600156056L;
/**
* A {@code Set} that provides a view of all of this
* Subject's Principals
*
* <p>
*
* @serial Each element in this set is a
* {@code java.security.Principal}.
* The set is a {@code Subject.SecureSet}.
*/
Set<Principal> principals;
/**
* Sets that provide a view of all of this
* Subject's Credentials
*/
transient Set<Object> pubCredentials;
transient Set<Object> privCredentials;
/**
* Whether this Subject is read-only
*
* @serial
*/
private volatile boolean readOnly = false;
private static final int PRINCIPAL_SET = 1;
private static final int PUB_CREDENTIAL_SET = 2;
private static final int PRIV_CREDENTIAL_SET = 3;
private static final ProtectionDomain[] NULL_PD_ARRAY
= new ProtectionDomain[0];
/**
* Create an instance of a {@code Subject}
* with an empty {@code Set} of Principals and empty
* Sets of public and private credentials.
*
* <p> The newly constructed Sets check whether this {@code Subject}
* has been set read-only before permitting subsequent modifications.
* The newly created Sets also prevent illegal modifications
* by ensuring that callers have sufficient permissions.
*
* <p> To modify the Principals Set, the caller must have
* {@code AuthPermission("modifyPrincipals")}.
* To modify the public credential Set, the caller must have
* {@code AuthPermission("modifyPublicCredentials")}.
* To modify the private credential Set, the caller must have
* {@code AuthPermission("modifyPrivateCredentials")}.
*/
public Subject() {
this.principals = Collections.synchronizedSet
(new SecureSet<Principal>(this, PRINCIPAL_SET));
this.pubCredentials = Collections.synchronizedSet
(new SecureSet<Object>(this, PUB_CREDENTIAL_SET));
this.privCredentials = Collections.synchronizedSet
(new SecureSet<Object>(this, PRIV_CREDENTIAL_SET));
}
/**
* Create an instance of a {@code Subject} with
* Principals and credentials.
*
* <p> The Principals and credentials from the specified Sets
* are copied into newly constructed Sets.
* These newly created Sets check whether this {@code Subject}
* has been set read-only before permitting subsequent modifications.
* The newly created Sets also prevent illegal modifications
* by ensuring that callers have sufficient permissions.
*
* <p> To modify the Principals Set, the caller must have
* {@code AuthPermission("modifyPrincipals")}.
* To modify the public credential Set, the caller must have
* {@code AuthPermission("modifyPublicCredentials")}.
* To modify the private credential Set, the caller must have
* {@code AuthPermission("modifyPrivateCredentials")}.
* <p>
*
* @param readOnly true if the {@code Subject} is to be read-only,
* and false otherwise. <p>
*
* @param principals the {@code Set} of Principals
* to be associated with this {@code Subject}. <p>
*
* @param pubCredentials the {@code Set} of public credentials
* to be associated with this {@code Subject}. <p>
*
* @param privCredentials the {@code Set} of private credentials
* to be associated with this {@code Subject}.
*
* @exception NullPointerException if the specified
* {@code principals}, {@code pubCredentials},
* or {@code privCredentials} are {@code null}.
*/
public Subject(boolean readOnly, Set<? extends Principal> principals,
Set<?> pubCredentials, Set<?> privCredentials)
{
if (principals == null ||
pubCredentials == null ||
privCredentials == null)
throw new NullPointerException
(ResourcesMgr.getString("invalid.null.input.s."));
this.principals = Collections.synchronizedSet(new SecureSet<Principal>
(this, PRINCIPAL_SET, principals));
this.pubCredentials = Collections.synchronizedSet(new SecureSet<Object>
(this, PUB_CREDENTIAL_SET, pubCredentials));
this.privCredentials = Collections.synchronizedSet(new SecureSet<Object>
(this, PRIV_CREDENTIAL_SET, privCredentials));
this.readOnly = readOnly;
}
/**
* Set this {@code Subject} to be read-only.
*
* <p> Modifications (additions and removals) to this Subject's
* {@code Principal} {@code Set} and
* credential Sets will be disallowed.
* The {@code destroy} operation on this Subject's credentials will
* still be permitted.
*
* <p> Subsequent attempts to modify the Subject's {@code Principal}
* and credential Sets will result in an
* {@code IllegalStateException} being thrown.
* Also, once a {@code Subject} is read-only,
* it can not be reset to being writable again.
*
* <p>
*
* @exception SecurityException if the caller does not have permission
* to set this {@code Subject} to be read-only.
*/
public void setReadOnly() {
java.lang.SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(AuthPermissionHolder.SET_READ_ONLY_PERMISSION);
}
this.readOnly = true;
}
/**
* Query whether this {@code Subject} is read-only.
*
* <p>
*
* @return true if this {@code Subject} is read-only, false otherwise.
*/
public boolean isReadOnly() {
return this.readOnly;
}
/**
* Get the {@code Subject} associated with the provided
* {@code AccessControlContext}.
*
* <p> The {@code AccessControlContext} may contain many
* Subjects (from nested {@code doAs} calls).
* In this situation, the most recent {@code Subject} associated
* with the {@code AccessControlContext} is returned.
*
* <p>
*
* @param acc the {@code AccessControlContext} from which to retrieve
* the {@code Subject}.
*
* @return the {@code Subject} associated with the provided
* {@code AccessControlContext}, or {@code null}
* if no {@code Subject} is associated
* with the provided {@code AccessControlContext}.
*
* @exception SecurityException if the caller does not have permission
* to get the {@code Subject}. <p>
*
* @exception NullPointerException if the provided
* {@code AccessControlContext} is {@code null}.
*/
public static Subject getSubject(final AccessControlContext acc) {
java.lang.SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(AuthPermissionHolder.GET_SUBJECT_PERMISSION);
}
if (acc == null) {
throw new NullPointerException(ResourcesMgr.getString
("invalid.null.AccessControlContext.provided"));
}
// return the Subject from the DomainCombiner of the provided context
return AccessController.doPrivileged
(new java.security.PrivilegedAction<Subject>() {
public Subject run() {
DomainCombiner dc = acc.getDomainCombiner();
if (!(dc instanceof SubjectDomainCombiner))
return null;
SubjectDomainCombiner sdc = (SubjectDomainCombiner)dc;
return sdc.getSubject();
}
});
}
/**
* Perform work as a particular {@code Subject}.
*
* <p> This method first retrieves the current Thread's
* {@code AccessControlContext} via
* {@code AccessController.getContext},
* and then instantiates a new {@code AccessControlContext}
* using the retrieved context along with a new
* {@code SubjectDomainCombiner} (constructed using
* the provided {@code Subject}).
* Finally, this method invokes {@code AccessController.doPrivileged},
* passing it the provided {@code PrivilegedAction},
* as well as the newly constructed {@code AccessControlContext}.
*
* <p>
*
* @param subject the {@code Subject} that the specified
* {@code action} will run as. This parameter
* may be {@code null}. <p>
*
* @param <T> the type of the value returned by the PrivilegedAction's
* {@code run} method.
*
* @param action the code to be run as the specified
* {@code Subject}. <p>
*
* @return the value returned by the PrivilegedAction's
* {@code run} method.
*
* @exception NullPointerException if the {@code PrivilegedAction}
* is {@code null}. <p>
*
* @exception SecurityException if the caller does not have permission
* to invoke this method.
*/
public static <T> T doAs(final Subject subject,
final java.security.PrivilegedAction<T> action) {
java.lang.SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(AuthPermissionHolder.DO_AS_PERMISSION);
}
if (action == null)
throw new NullPointerException
(ResourcesMgr.getString("invalid.null.action.provided"));
// set up the new Subject-based AccessControlContext
// for doPrivileged
final AccessControlContext currentAcc = AccessController.getContext();
// call doPrivileged and push this new context on the stack
return java.security.AccessController.doPrivileged
(action,
createContext(subject, currentAcc));
}
/**
* Perform work as a particular {@code Subject}.
*
* <p> This method first retrieves the current Thread's
* {@code AccessControlContext} via
* {@code AccessController.getContext},
* and then instantiates a new {@code AccessControlContext}
* using the retrieved context along with a new
* {@code SubjectDomainCombiner} (constructed using
* the provided {@code Subject}).
* Finally, this method invokes {@code AccessController.doPrivileged},
* passing it the provided {@code PrivilegedExceptionAction},
* as well as the newly constructed {@code AccessControlContext}.
*
* <p>
*
* @param subject the {@code Subject} that the specified
* {@code action} will run as. This parameter
* may be {@code null}. <p>
*
* @param <T> the type of the value returned by the
* PrivilegedExceptionAction's {@code run} method.
*
* @param action the code to be run as the specified
* {@code Subject}. <p>
*
* @return the value returned by the
* PrivilegedExceptionAction's {@code run} method.
*
* @exception PrivilegedActionException if the
* {@code PrivilegedExceptionAction.run}
* method throws a checked exception. <p>
*
* @exception NullPointerException if the specified
* {@code PrivilegedExceptionAction} is
* {@code null}. <p>
*
* @exception SecurityException if the caller does not have permission
* to invoke this method.
*/
public static <T> T doAs(final Subject subject,
final java.security.PrivilegedExceptionAction<T> action)
throws java.security.PrivilegedActionException {
java.lang.SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(AuthPermissionHolder.DO_AS_PERMISSION);
}
if (action == null)
throw new NullPointerException
(ResourcesMgr.getString("invalid.null.action.provided"));
// set up the new Subject-based AccessControlContext for doPrivileged
final AccessControlContext currentAcc = AccessController.getContext();
// call doPrivileged and push this new context on the stack
return java.security.AccessController.doPrivileged
(action,
createContext(subject, currentAcc));
}
/**
* Perform privileged work as a particular {@code Subject}.
*
* <p> This method behaves exactly as {@code Subject.doAs},
* except that instead of retrieving the current Thread's
* {@code AccessControlContext}, it uses the provided
* {@code AccessControlContext}. If the provided
* {@code AccessControlContext} is {@code null},
* this method instantiates a new {@code AccessControlContext}
* with an empty collection of ProtectionDomains.
*
* <p>
*
* @param subject the {@code Subject} that the specified
* {@code action} will run as. This parameter
* may be {@code null}. <p>
*
* @param <T> the type of the value returned by the PrivilegedAction's
* {@code run} method.
*
* @param action the code to be run as the specified
* {@code Subject}. <p>
*
* @param acc the {@code AccessControlContext} to be tied to the
* specified <i>subject</i> and <i>action</i>. <p>
*
* @return the value returned by the PrivilegedAction's
* {@code run} method.
*
* @exception NullPointerException if the {@code PrivilegedAction}
* is {@code null}. <p>
*
* @exception SecurityException if the caller does not have permission
* to invoke this method.
*/
public static <T> T doAsPrivileged(final Subject subject,
final java.security.PrivilegedAction<T> action,
final java.security.AccessControlContext acc) {
java.lang.SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(AuthPermissionHolder.DO_AS_PRIVILEGED_PERMISSION);
}
if (action == null)
throw new NullPointerException
(ResourcesMgr.getString("invalid.null.action.provided"));
// set up the new Subject-based AccessControlContext
// for doPrivileged
final AccessControlContext callerAcc =
(acc == null ?
new AccessControlContext(NULL_PD_ARRAY) :
acc);
// call doPrivileged and push this new context on the stack
return java.security.AccessController.doPrivileged
(action,
createContext(subject, callerAcc));
}
/**
* Perform privileged work as a particular {@code Subject}.
*
* <p> This method behaves exactly as {@code Subject.doAs},
* except that instead of retrieving the current Thread's
* {@code AccessControlContext}, it uses the provided
* {@code AccessControlContext}. If the provided
* {@code AccessControlContext} is {@code null},
* this method instantiates a new {@code AccessControlContext}
* with an empty collection of ProtectionDomains.
*
* <p>
*
* @param subject the {@code Subject} that the specified
* {@code action} will run as. This parameter
* may be {@code null}. <p>
*
* @param <T> the type of the value returned by the
* PrivilegedExceptionAction's {@code run} method.
*
* @param action the code to be run as the specified
* {@code Subject}. <p>
*
* @param acc the {@code AccessControlContext} to be tied to the
* specified <i>subject</i> and <i>action</i>. <p>
*
* @return the value returned by the
* PrivilegedExceptionAction's {@code run} method.
*
* @exception PrivilegedActionException if the
* {@code PrivilegedExceptionAction.run}
* method throws a checked exception. <p>
*
* @exception NullPointerException if the specified
* {@code PrivilegedExceptionAction} is
* {@code null}. <p>
*
* @exception SecurityException if the caller does not have permission
* to invoke this method.
*/
public static <T> T doAsPrivileged(final Subject subject,
final java.security.PrivilegedExceptionAction<T> action,
final java.security.AccessControlContext acc)
throws java.security.PrivilegedActionException {
java.lang.SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(AuthPermissionHolder.DO_AS_PRIVILEGED_PERMISSION);
}
if (action == null)
throw new NullPointerException
(ResourcesMgr.getString("invalid.null.action.provided"));
// set up the new Subject-based AccessControlContext for doPrivileged
final AccessControlContext callerAcc =
(acc == null ?
new AccessControlContext(NULL_PD_ARRAY) :
acc);
// call doPrivileged and push this new context on the stack
return java.security.AccessController.doPrivileged
(action,
createContext(subject, callerAcc));
}
private static AccessControlContext createContext(final Subject subject,
final AccessControlContext acc) {
return java.security.AccessController.doPrivileged
(new java.security.PrivilegedAction<AccessControlContext>() {
public AccessControlContext run() {
if (subject == null)
return new AccessControlContext(acc, null);
else
return new AccessControlContext
(acc,
new SubjectDomainCombiner(subject));
}
});
}
/**
* Return the {@code Set} of Principals associated with this
* {@code Subject}. Each {@code Principal} represents
* an identity for this {@code Subject}.
*
* <p> The returned {@code Set} is backed by this Subject's
* internal {@code Principal} {@code Set}. Any modification
* to the returned {@code Set} affects the internal
* {@code Principal} {@code Set} as well.
*
* <p>
*
* @return The {@code Set} of Principals associated with this
* {@code Subject}.
*/
public Set<Principal> getPrincipals() {
// always return an empty Set instead of null
// so LoginModules can add to the Set if necessary
return principals;
}
/**
* Return a {@code Set} of Principals associated with this
* {@code Subject} that are instances or subclasses of the specified
* {@code Class}.
*
* <p> The returned {@code Set} is not backed by this Subject's
* internal {@code Principal} {@code Set}. A new
* {@code Set} is created and returned for each method invocation.
* Modifications to the returned {@code Set}
* will not affect the internal {@code Principal} {@code Set}.
*
* <p>
*
* @param <T> the type of the class modeled by {@code c}
*
* @param c the returned {@code Set} of Principals will all be
* instances of this class.
*
* @return a {@code Set} of Principals that are instances of the
* specified {@code Class}.
*
* @exception NullPointerException if the specified {@code Class}
* is {@code null}.
*/
public <T extends Principal> Set<T> getPrincipals(Class<T> c) {
if (c == null)
throw new NullPointerException
(ResourcesMgr.getString("invalid.null.Class.provided"));
// always return an empty Set instead of null
// so LoginModules can add to the Set if necessary
return new ClassSet<T>(PRINCIPAL_SET, c);
}
/**
* Return the {@code Set} of public credentials held by this
* {@code Subject}.
*
* <p> The returned {@code Set} is backed by this Subject's
* internal public Credential {@code Set}. Any modification
* to the returned {@code Set} affects the internal public
* Credential {@code Set} as well.
*
* <p>
*
* @return A {@code Set} of public credentials held by this
* {@code Subject}.
*/
public Set<Object> getPublicCredentials() {
// always return an empty Set instead of null
// so LoginModules can add to the Set if necessary
return pubCredentials;
}
/**
* Return the {@code Set} of private credentials held by this
* {@code Subject}.
*
* <p> The returned {@code Set} is backed by this Subject's
* internal private Credential {@code Set}. Any modification
* to the returned {@code Set} affects the internal private
* Credential {@code Set} as well.
*
* <p> A caller requires permissions to access the Credentials
* in the returned {@code Set}, or to modify the
* {@code Set} itself. A {@code SecurityException}
* is thrown if the caller does not have the proper permissions.
*
* <p> While iterating through the {@code Set},
* a {@code SecurityException} is thrown
* if the caller does not have permission to access a
* particular Credential. The {@code Iterator}
* is nevertheless advanced to next element in the {@code Set}.
*
* <p>
*
* @return A {@code Set} of private credentials held by this
* {@code Subject}.
*/
public Set<Object> getPrivateCredentials() {
// XXX
// we do not need a security check for
// AuthPermission(getPrivateCredentials)
// because we already restrict access to private credentials
// via the PrivateCredentialPermission. all the extra AuthPermission
// would do is protect the set operations themselves
// (like size()), which don't seem security-sensitive.
// always return an empty Set instead of null
// so LoginModules can add to the Set if necessary
return privCredentials;
}
/**
* Return a {@code Set} of public credentials associated with this
* {@code Subject} that are instances or subclasses of the specified
* {@code Class}.
*
* <p> The returned {@code Set} is not backed by this Subject's
* internal public Credential {@code Set}. A new
* {@code Set} is created and returned for each method invocation.
* Modifications to the returned {@code Set}
* will not affect the internal public Credential {@code Set}.
*
* <p>
*
* @param <T> the type of the class modeled by {@code c}
*
* @param c the returned {@code Set} of public credentials will all be
* instances of this class.
*
* @return a {@code Set} of public credentials that are instances
* of the specified {@code Class}.
*
* @exception NullPointerException if the specified {@code Class}
* is {@code null}.
*/
public <T> Set<T> getPublicCredentials(Class<T> c) {
if (c == null)
throw new NullPointerException
(ResourcesMgr.getString("invalid.null.Class.provided"));
// always return an empty Set instead of null
// so LoginModules can add to the Set if necessary
return new ClassSet<T>(PUB_CREDENTIAL_SET, c);
}
/**
* Return a {@code Set} of private credentials associated with this
* {@code Subject} that are instances or subclasses of the specified
* {@code Class}.
*
* <p> The caller must have permission to access all of the
* requested Credentials, or a {@code SecurityException}
* will be thrown.
*
* <p> The returned {@code Set} is not backed by this Subject's
* internal private Credential {@code Set}. A new
* {@code Set} is created and returned for each method invocation.
* Modifications to the returned {@code Set}
* will not affect the internal private Credential {@code Set}.
*
* <p>
*
* @param <T> the type of the class modeled by {@code c}
*
* @param c the returned {@code Set} of private credentials will all be
* instances of this class.
*
* @return a {@code Set} of private credentials that are instances
* of the specified {@code Class}.
*
* @exception NullPointerException if the specified {@code Class}
* is {@code null}.
*/
public <T> Set<T> getPrivateCredentials(Class<T> c) {
// XXX
// we do not need a security check for
// AuthPermission(getPrivateCredentials)
// because we already restrict access to private credentials
// via the PrivateCredentialPermission. all the extra AuthPermission
// would do is protect the set operations themselves
// (like size()), which don't seem security-sensitive.
if (c == null)
throw new NullPointerException
(ResourcesMgr.getString("invalid.null.Class.provided"));
// always return an empty Set instead of null
// so LoginModules can add to the Set if necessary
return new ClassSet<T>(PRIV_CREDENTIAL_SET, c);
}
/**
* Compares the specified Object with this {@code Subject}
* for equality. Returns true if the given object is also a Subject
* and the two {@code Subject} instances are equivalent.
* More formally, two {@code Subject} instances are
* equal if their {@code Principal} and {@code Credential}
* Sets are equal.
*
* <p>
*
* @param o Object to be compared for equality with this
* {@code Subject}.
*
* @return true if the specified Object is equal to this
* {@code Subject}.
*
* @exception SecurityException if the caller does not have permission
* to access the private credentials for this {@code Subject},
* or if the caller does not have permission to access the
* private credentials for the provided {@code Subject}.
*/
public boolean equals(Object o) {
if (o == null)
return false;
if (this == o)
return true;
if (o instanceof Subject) {
final Subject that = (Subject)o;
// check the principal and credential sets
Set<Principal> thatPrincipals;
synchronized(that.principals) {
// avoid deadlock from dual locks
thatPrincipals = new HashSet<Principal>(that.principals);
}
if (!principals.equals(thatPrincipals)) {
return false;
}
Set<Object> thatPubCredentials;
synchronized(that.pubCredentials) {
// avoid deadlock from dual locks
thatPubCredentials = new HashSet<Object>(that.pubCredentials);
}
if (!pubCredentials.equals(thatPubCredentials)) {
return false;
}
Set<Object> thatPrivCredentials;
synchronized(that.privCredentials) {
// avoid deadlock from dual locks
thatPrivCredentials = new HashSet<Object>(that.privCredentials);
}
if (!privCredentials.equals(thatPrivCredentials)) {
return false;
}
return true;
}
return false;
}
/**
* Return the String representation of this {@code Subject}.
*
* <p>
*
* @return the String representation of this {@code Subject}.
*/
public String toString() {
return toString(true);
}
/**
* package private convenience method to print out the Subject
* without firing off a security check when trying to access
* the Private Credentials
*/
String toString(boolean includePrivateCredentials) {
String s = ResourcesMgr.getString("Subject.");
String suffix = "";
synchronized(principals) {
Iterator<Principal> pI = principals.iterator();
while (pI.hasNext()) {
Principal p = pI.next();
suffix = suffix + ResourcesMgr.getString(".Principal.") +
p.toString() + ResourcesMgr.getString("NEWLINE");
}
}
synchronized(pubCredentials) {
Iterator<Object> pI = pubCredentials.iterator();
while (pI.hasNext()) {
Object o = pI.next();
suffix = suffix +
ResourcesMgr.getString(".Public.Credential.") +
o.toString() + ResourcesMgr.getString("NEWLINE");
}
}
if (includePrivateCredentials) {
synchronized(privCredentials) {
Iterator<Object> pI = privCredentials.iterator();
while (pI.hasNext()) {
try {
Object o = pI.next();
suffix += ResourcesMgr.getString
(".Private.Credential.") +
o.toString() +
ResourcesMgr.getString("NEWLINE");
} catch (SecurityException se) {
suffix += ResourcesMgr.getString
(".Private.Credential.inaccessible.");
break;
}
}
}
}
return s + suffix;
}
/**
* Returns a hashcode for this {@code Subject}.
*
* <p>
*
* @return a hashcode for this {@code Subject}.
*
* @exception SecurityException if the caller does not have permission
* to access this Subject's private credentials.
*/
public int hashCode() {
/**
* The hashcode is derived exclusive or-ing the
* hashcodes of this Subject's Principals and credentials.
*
* If a particular credential was destroyed
* ({@code credential.hashCode()} throws an
* {@code IllegalStateException}),
* the hashcode for that credential is derived via:
* {@code credential.getClass().toString().hashCode()}.
*/
int hashCode = 0;
synchronized(principals) {
Iterator<Principal> pIterator = principals.iterator();
while (pIterator.hasNext()) {
Principal p = pIterator.next();
hashCode ^= p.hashCode();
}
}
synchronized(pubCredentials) {
Iterator<Object> pubCIterator = pubCredentials.iterator();
while (pubCIterator.hasNext()) {
hashCode ^= getCredHashCode(pubCIterator.next());
}
}
return hashCode;
}
/**
* get a credential's hashcode
*/
private int getCredHashCode(Object o) {
try {
return o.hashCode();
} catch (IllegalStateException ise) {
return o.getClass().toString().hashCode();
}
}
/**
* Writes this object out to a stream (i.e., serializes it).
*/
private void writeObject(java.io.ObjectOutputStream oos)
throws java.io.IOException {
synchronized(principals) {
oos.defaultWriteObject();
}
}
/**
* Reads this object from a stream (i.e., deserializes it)
*/
@SuppressWarnings("unchecked")
private void readObject(java.io.ObjectInputStream s)
throws java.io.IOException, ClassNotFoundException {
ObjectInputStream.GetField gf = s.readFields();
readOnly = gf.get("readOnly", false);
Set<Principal> inputPrincs = (Set<Principal>)gf.get("principals", null);
// Rewrap the principals into a SecureSet
if (inputPrincs == null) {
throw new NullPointerException
(ResourcesMgr.getString("invalid.null.input.s."));
}
try {
principals = Collections.synchronizedSet(new SecureSet<Principal>
(this, PRINCIPAL_SET, inputPrincs));
} catch (NullPointerException npe) {
// Sometimes people deserialize the principals set only.
// Subject is not accessible, so just don't fail.
principals = Collections.synchronizedSet
(new SecureSet<Principal>(this, PRINCIPAL_SET));
}
// The Credential {@code Set} is not serialized, but we do not
// want the default deserialization routine to set it to null.
this.pubCredentials = Collections.synchronizedSet
(new SecureSet<Object>(this, PUB_CREDENTIAL_SET));
this.privCredentials = Collections.synchronizedSet
(new SecureSet<Object>(this, PRIV_CREDENTIAL_SET));
}
/**
* Prevent modifications unless caller has permission.
*
* @serial include
*/
private static class SecureSet<E>
extends AbstractSet<E>
implements java.io.Serializable {
private static final long serialVersionUID = 7911754171111800359L;
/**
* @serialField this$0 Subject The outer Subject instance.
* @serialField elements LinkedList The elements in this set.
*/
private static final ObjectStreamField[] serialPersistentFields = {
new ObjectStreamField("this$0", Subject.class),
new ObjectStreamField("elements", LinkedList.class),
new ObjectStreamField("which", int.class)
};
Subject subject;
LinkedList<E> elements;
/**
* @serial An integer identifying the type of objects contained
* in this set. If {@code which == 1},
* this is a Principal set and all the elements are
* of type {@code java.security.Principal}.
* If {@code which == 2}, this is a public credential
* set and all the elements are of type {@code Object}.
* If {@code which == 3}, this is a private credential
* set and all the elements are of type {@code Object}.
*/
private int which;
SecureSet(Subject subject, int which) {
this.subject = subject;
this.which = which;
this.elements = new LinkedList<E>();
}
SecureSet(Subject subject, int which, Set<? extends E> set) {
this.subject = subject;
this.which = which;
this.elements = new LinkedList<E>(set);
}
public int size() {
return elements.size();
}
public Iterator<E> iterator() {
final LinkedList<E> list = elements;
return new Iterator<E>() {
ListIterator<E> i = list.listIterator(0);
public boolean hasNext() {return i.hasNext();}
public E next() {
if (which != Subject.PRIV_CREDENTIAL_SET) {
return i.next();
}
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
try {
sm.checkPermission(new PrivateCredentialPermission
(list.get(i.nextIndex()).getClass().getName(),
subject.getPrincipals()));
} catch (SecurityException se) {
i.next();
throw (se);
}
}
return i.next();
}
public void remove() {
if (subject.isReadOnly()) {
throw new IllegalStateException(ResourcesMgr.getString
("Subject.is.read.only"));
}
java.lang.SecurityManager sm = System.getSecurityManager();
if (sm != null) {
switch (which) {
case Subject.PRINCIPAL_SET:
sm.checkPermission(AuthPermissionHolder.MODIFY_PRINCIPALS_PERMISSION);
break;
case Subject.PUB_CREDENTIAL_SET:
sm.checkPermission(AuthPermissionHolder.MODIFY_PUBLIC_CREDENTIALS_PERMISSION);
break;
default:
sm.checkPermission(AuthPermissionHolder.MODIFY_PRIVATE_CREDENTIALS_PERMISSION);
break;
}
}
i.remove();
}
};
}
public boolean add(E o) {
if (subject.isReadOnly()) {
throw new IllegalStateException
(ResourcesMgr.getString("Subject.is.read.only"));
}
java.lang.SecurityManager sm = System.getSecurityManager();
if (sm != null) {
switch (which) {
case Subject.PRINCIPAL_SET:
sm.checkPermission(AuthPermissionHolder.MODIFY_PRINCIPALS_PERMISSION);
break;
case Subject.PUB_CREDENTIAL_SET:
sm.checkPermission(AuthPermissionHolder.MODIFY_PUBLIC_CREDENTIALS_PERMISSION);
break;
default:
sm.checkPermission(AuthPermissionHolder.MODIFY_PRIVATE_CREDENTIALS_PERMISSION);
break;
}
}
switch (which) {
case Subject.PRINCIPAL_SET:
if (!(o instanceof Principal)) {
throw new SecurityException(ResourcesMgr.getString
("attempting.to.add.an.object.which.is.not.an.instance.of.java.security.Principal.to.a.Subject.s.Principal.Set"));
}
break;
default:
// ok to add Objects of any kind to credential sets
break;
}
// check for duplicates
if (!elements.contains(o))
return elements.add(o);
else
return false;
}
public boolean remove(Object o) {
final Iterator<E> e = iterator();
while (e.hasNext()) {
E next;
if (which != Subject.PRIV_CREDENTIAL_SET) {
next = e.next();
} else {
next = java.security.AccessController.doPrivileged
(new java.security.PrivilegedAction<E>() {
public E run() {
return e.next();
}
});
}
if (next == null) {
if (o == null) {
e.remove();
return true;
}
} else if (next.equals(o)) {
e.remove();
return true;
}
}
return false;
}
public boolean contains(Object o) {
final Iterator<E> e = iterator();
while (e.hasNext()) {
E next;
if (which != Subject.PRIV_CREDENTIAL_SET) {
next = e.next();
} else {
// For private credentials:
// If the caller does not have read permission for
// for o.getClass(), we throw a SecurityException.
// Otherwise we check the private cred set to see whether
// it contains the Object
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(new PrivateCredentialPermission
(o.getClass().getName(),
subject.getPrincipals()));
}
next = java.security.AccessController.doPrivileged
(new java.security.PrivilegedAction<E>() {
public E run() {
return e.next();
}
});
}
if (next == null) {
if (o == null) {
return true;
}
} else if (next.equals(o)) {
return true;
}
}
return false;
}
public boolean removeAll(Collection<?> c) {
Objects.requireNonNull(c);
boolean modified = false;
final Iterator<E> e = iterator();
while (e.hasNext()) {
E next;
if (which != Subject.PRIV_CREDENTIAL_SET) {
next = e.next();
} else {
next = java.security.AccessController.doPrivileged
(new java.security.PrivilegedAction<E>() {
public E run() {
return e.next();
}
});
}
Iterator<?> ce = c.iterator();
while (ce.hasNext()) {
Object o = ce.next();
if (next == null) {
if (o == null) {
e.remove();
modified = true;
break;
}
} else if (next.equals(o)) {
e.remove();
modified = true;
break;
}
}
}
return modified;
}
public boolean retainAll(Collection<?> c) {
Objects.requireNonNull(c);
boolean modified = false;
boolean retain = false;
final Iterator<E> e = iterator();
while (e.hasNext()) {
retain = false;
E next;
if (which != Subject.PRIV_CREDENTIAL_SET) {
next = e.next();
} else {
next = java.security.AccessController.doPrivileged
(new java.security.PrivilegedAction<E>() {
public E run() {
return e.next();
}
});
}
Iterator<?> ce = c.iterator();
while (ce.hasNext()) {
Object o = ce.next();
if (next == null) {
if (o == null) {
retain = true;
break;
}
} else if (next.equals(o)) {
retain = true;
break;
}
}
if (!retain) {
e.remove();
retain = false;
modified = true;
}
}
return modified;
}
public void clear() {
final Iterator<E> e = iterator();
while (e.hasNext()) {
E next;
if (which != Subject.PRIV_CREDENTIAL_SET) {
next = e.next();
} else {
next = java.security.AccessController.doPrivileged
(new java.security.PrivilegedAction<E>() {
public E run() {
return e.next();
}
});
}
e.remove();
}
}
/**
* Writes this object out to a stream (i.e., serializes it).
*
* <p>
*
* @serialData If this is a private credential set,
* a security check is performed to ensure that
* the caller has permission to access each credential
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