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

Class KerberosPrincipal

java.lang.Object
javax.security.auth.kerberos.KerberosPrincipal
All Implemented Interfaces:
Serializable, Principal
public final class KerberosPrincipal
extends Object
implements Principal, Serializable
This class encapsulates a Kerberos principal.
Since:
1.4
See Also:
Serialized Form

  • Field Summary

    Fields 
    Modifier and Type Field Description
    static int KRB_NT_ENTERPRISE
    Enterprise name (alias)
    static int KRB_NT_PRINCIPAL
    user principal name type.
    static int KRB_NT_SRV_HST
    service with host name as instance (telnet, rcommands) name type.
    static int KRB_NT_SRV_INST
    service and other unique instance (krbtgt) name type.
    static int KRB_NT_SRV_XHST
    service with host as remaining components name type.
    static int KRB_NT_UID
    unique ID name type.
    static int KRB_NT_UNKNOWN
    unknown name type.

  • Constructor Summary

    Constructors 
    Constructor Description
    KerberosPrincipal​(String name)
    Constructs a KerberosPrincipal from the provided string input.
    KerberosPrincipal​(String name, int nameType)
    Constructs a KerberosPrincipal from the provided string and name type input.

  • Method Summary

    Modifier and Type Method Description
    boolean equals​(Object other)
    Compares the specified object with this principal for equality.
    String getName()
    The returned string corresponds to the single-string representation of a Kerberos Principal name as specified in Section 2.1 of RFC 1964.
    int getNameType()
    Returns the name type of the KerberosPrincipal.
    String getRealm()
    Returns the realm component of this Kerberos principal.
    int hashCode()
    Returns a hash code for this KerberosPrincipal.
    String toString()
    Returns an informative textual representation of this KerberosPrincipal.

    Methods declared in class java.lang.Object

    clone, finalize, getClass, notify, notifyAll, wait, wait, wait

    Methods declared in interface java.security.Principal

    implies

  • Field Details

  • Constructor Details

    • KerberosPrincipal

      public KerberosPrincipal​(String name)
      Constructs a KerberosPrincipal from the provided string input. The name type for this principal defaults to KRB_NT_PRINCIPAL This string is assumed to contain a name in the format that is specified in Section 2.1.1. (Kerberos Principal Name Form) of RFC 1964 (for example, duke@FOO.COM, where duke represents a principal, and FOO.COM represents a realm).

      If the input name does not contain a realm, the default realm is used. The default realm can be specified either in a Kerberos configuration file or via the system property. For more information, see the Kerberos Requirements.

      Note that when this class or any other Kerberos-related class is initially loaded and initialized, it may read and cache the default realm from the Kerberos configuration file or via the java.security.krb5.realm system property (the value will be empty if no default realm is specified), such that any subsequent calls to set or change the default realm by setting the java.security.krb5.realm system property may be ignored.

      Additionally, if a security manager is installed, a ServicePermission must be granted and the service principal of the permission must minimally be inside the KerberosPrincipal's realm. For example, if the result of new KerberosPrincipal("user") is user@EXAMPLE.COM, then a ServicePermission with service principal host/www.example.com@EXAMPLE.COM (and any action) must be granted.

      Parameters:
      name - the principal name
      Throws:
      IllegalArgumentException - if name is improperly formatted, if name is null, or if name does not contain the realm to use and the default realm is not specified in either a Kerberos configuration file or via the java.security.krb5.realm system property.
      SecurityException - if a security manager is installed and name does not contain the realm to use, and a proper ServicePermission as described above is not granted.

    • KerberosPrincipal

      public KerberosPrincipal​(String name, int nameType)
      Constructs a KerberosPrincipal from the provided string and name type input. The string is assumed to contain a name in the format that is specified in Section 2.1 (Mandatory Name Forms) of RFC 1964. Valid name types are specified in Section 6.2 (Principal Names) of RFC 4120. The input name must be consistent with the provided name type. (for example, duke@FOO.COM, is a valid input string for the name type, KRB_NT_PRINCIPAL where duke represents a principal, and FOO.COM represents a realm).

      If the input name does not contain a realm, the default realm is used. The default realm can be specified either in a Kerberos configuration file or via the system property. For more information, see the Kerberos Requirements.

      Note that when this class or any other Kerberos-related class is initially loaded and initialized, it may read and cache the default realm from the Kerberos configuration file or via the java.security.krb5.realm system property (the value will be empty if no default realm is specified), such that any subsequent calls to set or change the default realm by setting the java.security.krb5.realm system property may be ignored.

      Additionally, if a security manager is installed, a ServicePermission must be granted and the service principal of the permission must minimally be inside the KerberosPrincipal's realm. For example, if the result of new KerberosPrincipal("user") is user@EXAMPLE.COM, then a ServicePermission with service principal host/www.example.com@EXAMPLE.COM (and any action) must be granted.

      Parameters:
      name - the principal name
      nameType - the name type of the principal
      Throws:
      IllegalArgumentException - if name is improperly formatted, if name is null, if the nameType is not supported, or if name does not contain the realm to use and the default realm is not specified in either a Kerberos configuration file or via the java.security.krb5.realm system property.
      SecurityException - if a security manager is installed and name does not contain the realm to use, and a proper ServicePermission as described above is not granted.

  • Method Details

    • getRealm

      public String getRealm()
      Returns the realm component of this Kerberos principal.
      Returns:
      the realm component of this Kerberos principal.

    • hashCode

      public int hashCode()
      Returns a hash code for this KerberosPrincipal. The hash code is defined to be the result of the following calculation: 
      
  hashCode = getName().hashCode();
      Specified by:
      hashCode in interface Principal
      Overrides:
      hashCode in class Object
      Returns:
      a hash code for this KerberosPrincipal.
      See Also:
      Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)

    • equals

      public boolean equals​(Object other)
      Compares the specified object with this principal for equality. Returns true if the given object is also a KerberosPrincipal and the two KerberosPrincipal instances are equivalent. More formally two KerberosPrincipal instances are equal if the values returned by getName() are equal.
      Specified by:
      equals in interface Principal
      Overrides:
      equals in class Object
      Parameters:
      other - the object to compare to
      Returns:
      true if the object passed in represents the same principal as this one, false otherwise.
      See Also:
      Object.hashCode(), HashMap

    • getName

      public String getName()
      The returned string corresponds to the single-string representation of a Kerberos Principal name as specified in Section 2.1 of RFC 1964.
      Specified by:
      getName in interface Principal
      Returns:
      the principal name.

    • getNameType

      public int getNameType()
      Returns the name type of the KerberosPrincipal. Valid name types are specified in Section 6.2 of RFC4120.
      Returns:
      the name type.

    • toString

      public String toString()
      Returns an informative textual representation of this KerberosPrincipal.
      Specified by:
      toString in interface Principal
      Overrides:
      toString in class Object
      Returns:
      an informative textual representation of this KerberosPrincipal.