* All Kerberos JAAS login modules that authenticate a user to a KDC should * use this class. Where available, the login module might even read this * information from a ticket cache in the operating system instead of * directly communicating with the KDC. During the commit phase of the JAAS * authentication process, the JAAS login module should instantiate this * class and store the instance in the private credential set of a * {@link javax.security.auth.Subject Subject}.
* * It might be necessary for the application to be granted a * {@link javax.security.auth.PrivateCredentialPermission * PrivateCredentialPermission} if it needs to access a KerberosTicket * instance from a Subject. This permission is not needed when the * application depends on the default JGSS Kerberos mechanism to access the * KerberosTicket. In that case, however, the application will need an * appropriate * {@link javax.security.auth.kerberos.ServicePermission ServicePermission}. *
* Note that this class is applicable to both ticket granting tickets and
* other regular service tickets. A ticket granting ticket is just a
* special case of a more generalized service ticket.
*
* @see javax.security.auth.Subject
* @see javax.security.auth.PrivateCredentialPermission
* @see javax.security.auth.login.LoginContext
* @see org.ietf.jgss.GSSCredential
* @see org.ietf.jgss.GSSManager
*
* @author Mayank Upadhyay
* @version 1.16, 06/02/04
* @since 1.4
*/
public class KerberosTicket implements Destroyable, Refreshable,
java.io.Serializable {
private static final long serialVersionUID = 7395334370157380539L;
// TBD: Make these flag indices public
private static final int FORWARDABLE_TICKET_FLAG = 1;
private static final int FORWARDED_TICKET_FLAG = 2;
private static final int PROXIABLE_TICKET_FLAG = 3;
private static final int PROXY_TICKET_FLAG = 4;
private static final int POSTDATED_TICKET_FLAG = 6;
private static final int RENEWABLE_TICKET_FLAG = 8;
private static final int INITIAL_TICKET_FLAG = 9;
private static final int NUM_FLAGS = 32;
/**
*
* ASN.1 DER Encoding of the Ticket as defined in the
* Kerberos Protocol Specification RFC1510.
*
* @serial
*/
private byte[] asn1Encoding;
/**
*KeyImpl is serialized by writing out the ASN1 Encoded bytes
* of the encryption key. The ASN1 encoding is defined in RFC1510 and as
* follows:
*
* EncryptionKey ::= SEQUENCE {
* keytype[0] INTEGER,
* keyvalue[1] OCTET STRING
* }
*
*
* @serial
*/
private KeyImpl sessionKey;
/**
*
* Ticket Flags as defined in the Kerberos Protocol Specification RFC1510.
*
* @serial
*/
private boolean[] flags;
/**
*
* Time of initial authentication
*
* @serial
*/
private Date authTime;
/**
*
* Time after which the ticket is valid.
* @serial
*/
private Date startTime;
/**
*
* Time after which the ticket will not be honored. (its expiration time).
*
* @serial
*/
private Date endTime;
/**
*
* For renewable Tickets it indicates the maximum endtime that may be
* included in a renewal. It can be thought of as the absolute expiration
* time for the ticket, including all renewals. This field may be null
* for tickets that are not renewable.
*
* @serial
*/
private Date renewTill;
/**
*
* Client that owns the service ticket
*
* @serial
*/
private KerberosPrincipal client;
/**
*
* The service for which the ticket was issued.
*
* @serial
*/
private KerberosPrincipal server;
/**
*
* The addresses from where the ticket may be used by the client.
* This field may be null when the ticket is usable from any address.
*
* @serial
*/
private InetAddress[] clientAddresses;
private transient boolean destroyed = false;
/**
* Constructs a KerberosTicket using credentials information that a
* client either receives from a KDC or reads from a cache.
*
* @param asn1Encoding the ASN.1 encoding of the ticket as defined by
* the Kerberos protocol specification.
* @param client the client that owns this service
* ticket
* @param server the service that this ticket is for
* @param sessionKey the raw bytes for the session key that must be
* used to encrypt the authenticator that will be sent to the server
* @param keyType the key type for the session key as defined by the
* Kerberos protocol specification.
* @param flags the ticket flags. Each element in this array indicates
* the value for the corresponding bit in the ASN.1 BitString that
* represents the ticket flags. If the number of elements in this array
* is less than the number of flags used by the Kerberos protocol,
* then the missing flags will be filled in with false.
* @param authTime the time of initial authentication for the client
* @param startTime the time after which the ticket will be valid. This
* may be null in which case the value of authTime is treated as the
* startTime.
* @param endTime the time after which the ticket will no longer be
* valid
* @param renewTill an absolute expiration time for the ticket,
* including all renewal that might be possible. This field may be null
* for tickets that are not renewable.
* @param clientAddresses the addresses from where the ticket may be
* used by the client. This field may be null when the ticket is usable
* from any address.
*/
public KerberosTicket(byte[] asn1Encoding,
KerberosPrincipal client,
KerberosPrincipal server,
byte[] sessionKey,
int keyType,
boolean[] flags,
Date authTime,
Date startTime,
Date endTime,
Date renewTill,
InetAddress[] clientAddresses) {
init(asn1Encoding, client, server, sessionKey, keyType, flags,
authTime, startTime, endTime, renewTill, clientAddresses);
}
private void init(byte[] asn1Encoding,
KerberosPrincipal client,
KerberosPrincipal server,
byte[] sessionKey,
int keyType,
boolean[] flags,
Date authTime,
Date startTime,
Date endTime,
Date renewTill,
InetAddress[] clientAddresses) {
if (asn1Encoding == null)
throw new IllegalArgumentException("ASN.1 encoding of ticket"
+ " cannot be null");
this.asn1Encoding = asn1Encoding.clone();
if (client == null)
throw new IllegalArgumentException("Client name in ticket"
+ " cannot be null");
this.client = client;
if (server == null)
throw new IllegalArgumentException("Server name in ticket"
+ " cannot be null");
this.server = server;
if (sessionKey == null)
throw new IllegalArgumentException("Session key for ticket"
+ " cannot be null");
this.sessionKey = new KeyImpl(sessionKey, keyType);
if (flags != null) {
if (flags.length >= NUM_FLAGS)
this.flags = (boolean[]) flags.clone();
else {
this.flags = new boolean[NUM_FLAGS];
// Fill in whatever we have
for (int i = 0; i < flags.length; i++)
this.flags[i] = flags[i];
}
} else
this.flags = new boolean[NUM_FLAGS];
if (this.flags[RENEWABLE_TICKET_FLAG]) {
if (renewTill == null)
throw new IllegalArgumentException("The renewable period "
+ "end time cannot be null for renewable tickets.");
this.renewTill = renewTill;
}
if (authTime == null)
throw new IllegalArgumentException("Authentication time of ticket"
+ " cannot be null");
this.authTime = authTime;
this.startTime = (startTime != null? startTime: authTime);
if (endTime == null)
throw new IllegalArgumentException("End time for ticket validity"
+ " cannot be null");
this.endTime = endTime;
if (clientAddresses != null)
this.clientAddresses = (InetAddress[]) clientAddresses.clone();
}
/**
* Returns the client principal associated with this ticket.
*
* @return the client principal.
*/
public final KerberosPrincipal getClient() {
return client;
}
/**
* Returns the service principal associated with this ticket.
*
* @return the service principal.
*/
public final KerberosPrincipal getServer() {
return server;
}
/**
* Returns the session key associated with this ticket.
*
* @return the session key.
*/
public final SecretKey getSessionKey() {
if (destroyed)
throw new IllegalStateException("This ticket is no longer valid");
return sessionKey;
}
/**
* Returns the key type of the session key associated with this
* ticket as defined by the Kerberos Protocol Specification.
*
* @return the key type of the session key associated with this
* ticket.
*
* @see #getSessionKey()
*/
public final int getSessionKeyType() {
if (destroyed)
throw new IllegalStateException("This ticket is no longer valid");
return sessionKey.getKeyType();
}
/**
* Determines if this ticket is forwardable.
*
* @return true if this ticket is forwardable, false if not.
*/
public final boolean isForwardable() {
return flags[FORWARDABLE_TICKET_FLAG];
}
/**
* Determines if this ticket had been forwarded or was issued based on
* authentication involving a forwarded ticket-granting ticket.
*
* @return true if this ticket had been forwarded or was issued based on
* authentication involving a forwarded ticket-granting ticket,
* false otherwise.
*/
public final boolean isForwarded() {
return flags[FORWARDED_TICKET_FLAG];
}
/**
* Determines if this ticket is proxiable.
*
* @return true if this ticket is proxiable, false if not.
*/
public final boolean isProxiable() {
return flags[PROXIABLE_TICKET_FLAG];
}
/**
* Determines is this ticket is a proxy-ticket.
*
* @return true if this ticket is a proxy-ticket, false if not.
*/
public final boolean isProxy() {
return flags[PROXY_TICKET_FLAG];
}
/**
* Determines is this ticket is post-dated.
*
* @return true if this ticket is post-dated, false if not.
*/
public final boolean isPostdated() {
return flags[POSTDATED_TICKET_FLAG];
}
/**
* Determines is this ticket is renewable. If so, the {@link #refresh()
* refresh} method can be called, assuming the validity period for
* renewing is not already over.
*
* @return true if this ticket is renewable, false if not.
*/
public final boolean isRenewable() {
return flags[RENEWABLE_TICKET_FLAG];
}
/**
* Determines if this ticket was issued using the Kerberos AS-Exchange
* protocol, and not issued based on some ticket-granting ticket.
*
* @return true if this ticket was issued using the Kerberos AS-Exchange
* protocol, false if not.
*/
public final boolean isInitial() {
return flags[INITIAL_TICKET_FLAG];
}
/**
* Returns the flags associated with this ticket. Each element in the
* returned array indicates the value for the corresponding bit in the
* ASN.1 BitString that represents the ticket flags.
*
* @return the flags associated with this ticket.
*/
public final boolean[] getFlags() {
return (flags == null? null: (boolean[]) flags.clone());
}
/**
* Returns the time that the client was authenticated.
*
* @return the time that the client was authenticated.
*/
public final java.util.Date getAuthTime() {
return (authTime == null) ? null : new Date(authTime.getTime());
}
/**
* Returns the start time for this ticket's validity period.
*
* @return the start time for this ticket's validity period.
*/
public final java.util.Date getStartTime() {
return (startTime == null) ? null : new Date(startTime.getTime());
}
/**
* Returns the expiration time for this ticket's validity period.
*
* @return the expiration time for this ticket's validity period.
*/
public final java.util.Date getEndTime() {
return (endTime == null) ? null : new Date(endTime.getTime());
}
/**
* Returns the latest expiration time for this ticket, including all
* renewals. This will return a null value for non-renewable tickets.
*
* @return the latest expiration time for this ticket.
*/
public final java.util.Date getRenewTill() {
return (renewTill == null) ? null: new Date(renewTill.getTime());
}
/**
* Returns a list of addresses from where the ticket can be used.
*
* @return ths list of addresses or null, if the field was not
* provided.
*/
public final java.net.InetAddress[] getClientAddresses() {
return (clientAddresses == null?
null: (InetAddress[]) clientAddresses.clone());
}
/**
* Returns an ASN.1 encoding of the entire ticket.
*
* @return an ASN.1 encoding of the entire ticket.
*/
public final byte[] getEncoded() {
if (destroyed)
throw new IllegalStateException("This ticket is no longer valid");
return (byte[]) asn1Encoding.clone();
}
/** Determines if this ticket is still current. */
public boolean isCurrent() {
return (System.currentTimeMillis() <= getEndTime().getTime());
}
/**
* Extends the validity period of this ticket. The ticket will contain
* a new session key if the refresh operation succeeds. The refresh
* operation will fail if the ticket is not renewable or the latest
* allowable renew time has passed. Any other error returned by the
* KDC will also cause this method to fail.
*
* Note: This method is not synchronized with the the accessor
* methods of this object. Hence callers need to be aware of multiple
* threads that might access this and try to renew it at the same
* time.
*
* @throws RefreshFailedException if the ticket is not renewable, or
* the latest allowable renew time has passed, or the KDC returns some
* error.
*
* @see #isRenewable()
* @see #getRenewTill()
*/
public void refresh() throws RefreshFailedException {
if (destroyed)
throw new RefreshFailedException("A destroyed ticket "
+ "cannot be renewd.");
if (!isRenewable())
throw new RefreshFailedException("This ticket is not renewable");
if (System.currentTimeMillis() > getRenewTill().getTime())
throw new RefreshFailedException("This ticket is past "
+ "its last renewal time.");
Throwable e = null;
sun.security.krb5.Credentials krb5Creds = null;
try {
krb5Creds = new sun.security.krb5.Credentials(asn1Encoding,
client.toString(),
server.toString(),
sessionKey.getEncoded(),
sessionKey.getKeyType(),
flags,
authTime,
startTime,
endTime,
renewTill,
clientAddresses);
krb5Creds = krb5Creds.renew();
} catch (sun.security.krb5.KrbException krbException) {
e = krbException;
} catch (java.io.IOException ioException) {
e = ioException;
}
if (e != null) {
RefreshFailedException rfException
= new RefreshFailedException("Failed to renew Kerberos Ticket "
+ "for client " + client
+ " and server " + server
+ " - " + e.getMessage());
rfException.initCause(e);
throw rfException;
}
/*
* In case multiple threads try to refresh it at the same time.
*/
synchronized (this) {
try {
this.destroy();
} catch (DestroyFailedException dfException) {
// Squelch it since we don't care about the old ticket.
}
init(krb5Creds.getEncoded(),
new KerberosPrincipal(krb5Creds.getClient().getName()),
new KerberosPrincipal(krb5Creds.getServer().getName()),
krb5Creds.getSessionKey().getBytes(),
krb5Creds.getSessionKey().getEType(),
krb5Creds.getFlags(),
krb5Creds.getAuthTime(),
krb5Creds.getStartTime(),
krb5Creds.getEndTime(),
krb5Creds.getRenewTill(),
krb5Creds.getClientAddresses());
destroyed = false;
}
}
/**
* Destroys the ticket and destroys any sensitive information stored in
* it.
*/
public void destroy() throws DestroyFailedException {
if (!destroyed) {
Arrays.fill(asn1Encoding, (byte) 0);
client = null;
server = null;
sessionKey.destroy();
flags = null;
authTime = null;
startTime = null;
endTime = null;
renewTill = null;
clientAddresses = null;
destroyed = true;
}
}
/**
* Determines if this ticket has been destroyed.
*/
public boolean isDestroyed() {
return destroyed;
}
public String toString() {
if (destroyed)
throw new IllegalStateException("This ticket is no longer valid");
StringBuffer caddrBuf = new StringBuffer();
if (clientAddresses != null) {
for (int i = 0; i < clientAddresses.length; i++) {
caddrBuf.append("clientAddresses[" + i + "] = " +
clientAddresses[i].toString());
}
}
return ("Ticket (hex) = " + "\n" +
(new HexDumpEncoder()).encode(asn1Encoding) + "\n" +
"Client Principal = " + client.toString() + "\n" +
"Server Principal = " + server.toString() + "\n" +
"Session Key = " + sessionKey.toString() + "\n" +
"Forwardable Ticket " + flags[FORWARDABLE_TICKET_FLAG] + "\n" +
"Forwarded Ticket " + flags[FORWARDED_TICKET_FLAG] + "\n" +
"Proxiable Ticket " + flags[PROXIABLE_TICKET_FLAG] + "\n" +
"Proxy Ticket " + flags[PROXY_TICKET_FLAG] + "\n" +
"Postdated Ticket " + flags[POSTDATED_TICKET_FLAG] + "\n" +
"Renewable Ticket " + flags[RENEWABLE_TICKET_FLAG] + "\n" +
"Initial Ticket " + flags[RENEWABLE_TICKET_FLAG] + "\n" +
"Auth Time = " + authTime.toString() + "\n" +
"Start Time = " + startTime.toString() + "\n" +
"End Time = " + endTime.toString() + "\n" +
"Renew Till = " +
(renewTill == null ? "Null " : renewTill.toString()) + "\n" +
"Client Addresses " +
(clientAddresses == null ? " Null " : caddrBuf.toString() +
"\n"));
}
}