Module java.security.jgss
Package javax.security.auth.kerberos

Class KerberosTicket

  • All Implemented Interfaces:
    Serializable, Destroyable, Refreshable
    public class KerberosTicket
extends Object
implements Destroyable, Refreshable, Serializable
    This class encapsulates a Kerberos ticket and associated information as viewed from the client's point of view. It captures all information that the Key Distribution Center (KDC) sends to the client in the reply message KDC-REP defined in the Kerberos Protocol Specification (RFC 4120).

    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 Subject.

    It might be necessary for the application to be granted a 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 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.

    Implementation Note:
    The JAAS login module in the JDK reference implementation destroys all tickets after logout.
    Since:
    1.4
    See Also:
    Subject, PrivateCredentialPermission, LoginContext, GSSCredential, GSSManager, Serialized Form

    • Constructor Summary

      Constructors 
      Constructor Description
      KerberosTicket​(byte[] asn1Encoding, KerberosPrincipal client, KerberosPrincipal server, byte[] sessionKey, int keyType, boolean[] flags, Date authTime, Date startTime, Date endTime, Date renewTill, InetAddress[] clientAddresses)
      Constructs a KerberosTicket using credentials information that a client either receives from a KDC or reads from a cache.

    • Method Summary

      Modifier and Type Method Description
      void destroy()
      Destroys the ticket and destroys any sensitive information stored in it.
      boolean equals​(Object other)
      Compares the specified object with this KerberosTicket for equality.
      Date getAuthTime()
      Returns the time that the client was authenticated.
      KerberosPrincipal getClient()
      Returns the client principal associated with this ticket.
      InetAddress[] getClientAddresses()
      Returns a list of addresses from where the ticket can be used.
      byte[] getEncoded()
      Returns an ASN.1 encoding of the entire ticket.
      Date getEndTime()
      Returns the expiration time for this ticket's validity period.
      boolean[] getFlags()
      Returns the flags associated with this ticket.
      Date getRenewTill()
      Returns the latest expiration time for this ticket, including all renewals.
      KerberosPrincipal getServer()
      Returns the service principal associated with this ticket.
      SecretKey getSessionKey()
      Returns the session key associated with this ticket.
      int getSessionKeyType()
      Returns the key type of the session key associated with this ticket as defined by the Kerberos Protocol Specification.
      Date getStartTime()
      Returns the start time for this ticket's validity period.
      int hashCode()
      Returns a hash code for this KerberosTicket.
      boolean isCurrent()
      Determines if this ticket is still current.
      boolean isDestroyed()
      Determines if this ticket has been destroyed.
      boolean isForwardable()
      Determines if this ticket is forwardable.
      boolean isForwarded()
      Determines if this ticket had been forwarded or was issued based on authentication involving a forwarded ticket-granting ticket.
      boolean isInitial()
      Determines if this ticket was issued using the Kerberos AS-Exchange protocol, and not issued based on some ticket-granting ticket.
      boolean isPostdated()
      Determines is this ticket is post-dated.
      boolean isProxiable()
      Determines if this ticket is proxiable.
      boolean isProxy()
      Determines is this ticket is a proxy-ticket.
      boolean isRenewable()
      Determines is this ticket is renewable.
      void refresh()
      Extends the validity period of this ticket.
      String toString()
      Returns an informative textual representation of this KerberosTicket.

    • Constructor Detail

      • KerberosTicket

        public KerberosTicket​(byte[] asn1Encoding,
                      KerberosPrincipal client,
                      KerberosPrincipal server,
                      byte[] sessionKey,
                      int keyType,
                      boolean[] flags,
                      Date authTime,
                      Date startTime,
                      Date endTime,
                      Date renewTill,
                      InetAddress[] clientAddresses)
        Constructs a KerberosTicket using credentials information that a client either receives from a KDC or reads from a cache.
        Parameters:
        asn1Encoding - the ASN.1 encoding of the ticket as defined by the Kerberos protocol specification.
        client - the client that owns this service ticket
        server - the service that this ticket is for
        sessionKey - the raw bytes for the session key that must be used to encrypt the authenticator that will be sent to the server
        keyType - the key type for the session key as defined by the Kerberos protocol specification.
        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.
        authTime - the time of initial authentication for the client
        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.
        endTime - the time after which the ticket will no longer be valid
        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.
        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.

    • Method Detail

      • getClient

        public final KerberosPrincipal getClient()
        Returns the client principal associated with this ticket.
        Returns:
        the client principal, or null if destroyed.

      • getServer

        public final KerberosPrincipal getServer()
        Returns the service principal associated with this ticket.
        Returns:
        the service principal, or null if destroyed.

      • getSessionKey

        public final SecretKey getSessionKey()
        Returns the session key associated with this ticket. The return value is always a EncryptionKey object.
        Returns:
        the session key.
        Throws:
        IllegalStateException - if this ticket is destroyed

      • getSessionKeyType

        public final int getSessionKeyType()
        Returns the key type of the session key associated with this ticket as defined by the Kerberos Protocol Specification.
        Returns:
        the key type of the session key associated with this ticket.
        Throws:
        IllegalStateException - if this ticket is destroyed
        See Also:
        getSessionKey()

      • isForwardable

        public final boolean isForwardable()
        Determines if this ticket is forwardable.
        Returns:
        true if this ticket is forwardable, or false if not forwardable or destroyed.

      • isForwarded

        public final boolean isForwarded()
        Determines if this ticket had been forwarded or was issued based on authentication involving a forwarded ticket-granting ticket.
        Returns:
        true if this ticket had been forwarded or was issued based on authentication involving a forwarded ticket-granting ticket, or false otherwise or destroyed.

      • isProxiable

        public final boolean isProxiable()
        Determines if this ticket is proxiable.
        Returns:
        true if this ticket is proxiable, or false if not proxiable or destroyed.

      • isProxy

        public final boolean isProxy()
        Determines is this ticket is a proxy-ticket.
        Returns:
        true if this ticket is a proxy-ticket, or false if not a proxy-ticket or destroyed.

      • isPostdated

        public final boolean isPostdated()
        Determines is this ticket is post-dated.
        Returns:
        true if this ticket is post-dated, or false if not post-dated or destroyed.

      • isRenewable

        public final boolean isRenewable()
        Determines is this ticket is renewable. If so, the refresh method can be called, assuming the validity period for renewing is not already over.
        Returns:
        true if this ticket is renewable, or false if not renewable or destroyed.

      • isInitial

        public final boolean isInitial()
        Determines if this ticket was issued using the Kerberos AS-Exchange protocol, and not issued based on some ticket-granting ticket.
        Returns:
        true if this ticket was issued using the Kerberos AS-Exchange protocol, or false if not issued this way or destroyed.

      • getFlags

        public final boolean[] getFlags()
        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.
        Returns:
        the flags associated with this ticket, or null if destroyed.

      • getAuthTime

        public final Date getAuthTime()
        Returns the time that the client was authenticated.
        Returns:
        the time that the client was authenticated or null if the field is not set or this ticket is destroyed.

      • getStartTime

        public final Date getStartTime()
        Returns the start time for this ticket's validity period.
        Returns:
        the start time for this ticket's validity period or null if the field is not set or this ticket is destroyed.

      • getEndTime

        public final Date getEndTime()
        Returns the expiration time for this ticket's validity period.
        Returns:
        the expiration time for this ticket's validity period, or null if destroyed.

      • getRenewTill

        public final Date getRenewTill()
        Returns the latest expiration time for this ticket, including all renewals. This will return a null value for non-renewable tickets.
        Returns:
        the latest expiration time for this ticket, or null if destroyed.

      • getClientAddresses

        public final InetAddress[] getClientAddresses()
        Returns a list of addresses from where the ticket can be used.
        Returns:
        the list of addresses, or null if the field was not provided or this ticket is destroyed.

      • getEncoded

        public final byte[] getEncoded()
        Returns an ASN.1 encoding of the entire ticket.
        Returns:
        an ASN.1 encoding of the entire ticket. A new byte array is returned each time this method is called.
        Throws:
        IllegalStateException - if this ticket is destroyed

      • isCurrent

        public boolean isCurrent()
        Determines if this ticket is still current.
        Specified by:
        isCurrent in interface Refreshable
        Returns:
        true if this ticket is still current, or false if not current or destroyed.

      • refresh

        public void refresh()
             throws RefreshFailedException
        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 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.
        Specified by:
        refresh in interface Refreshable
        Throws:
        IllegalStateException - if this ticket is destroyed
        RefreshFailedException - if the ticket is not renewable, or the latest allowable renew time has passed, or the KDC returns some error.
        See Also:
        isRenewable(), getRenewTill()

      • isDestroyed

        public boolean isDestroyed()
        Determines if this ticket has been destroyed.
        Specified by:
        isDestroyed in interface Destroyable
        Returns:
        true if this Object has been destroyed, false otherwise.

      • toString

        public String toString()
        Returns an informative textual representation of this KerberosTicket.
        Overrides:
        toString in class Object
        Returns:
        an informative textual representation of this KerberosTicket.

      • equals

        public boolean equals​(Object other)
        Compares the specified object with this KerberosTicket for equality. Returns true if the given object is also a KerberosTicket and the two KerberosTicket instances are equivalent. A destroyed KerberosTicket object is only equal to itself.
        Overrides:
        equals in class Object
        Parameters:
        other - the object to compare to
        Returns:
        true if the specified object is equal to this KerberosTicket, false otherwise.
        Since:
        1.6
        See Also:
        Object.hashCode(), HashMap