Class semper.access.PassWordCapability
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Class semper.access.PassWordCapability

java.lang.Object
   |
   +----semper.access.Capability
           |
           +----semper.access.PassWordCapability

public class PassWordCapability
extends Capability
SEMPER Class of capability objects. Other managers must create and verify capabilities before performing potentially dangerous, compromising or undesirable operations. A password-capability is only valid if a correct password is/was entered sufficiently recently. The password expires after a certain time (as specified when creating the capability); after expiry it must be entered again when the capability is used.
Version:
$Revision: 1.6 $ $Date: 1996/08/21 07:40:35 $
Author:
Jaap-Henk Hoepman (jhh@cwi.nl)
See Also:
Capability

Constructor Index

 o PassWordCapability(String, String, int)
Creates a new PassWordCapability.

Method Index

 o getPassWord()
Check whether the capability is still valid and if so, return the true password.
 o isValid()
Check whether the capability is still valid.
 o myStreamSize()
Implementing the Streamable interface
 o readObject(StreamInputInterface)
Implementing the Streamable interface
 o writeObject(StreamOutputInterface)
Implementing the Streamable interface

Constructors

 o PassWordCapability
  public PassWordCapability(String desc,
                            String passwd,
                            int timeout)
Creates a new PassWordCapability. The capability is initially invalid.
Parameters:
desc - description of the capability.
passwd - encrypted passphrase to check against the password entered by the user.
timeout - timeout (in milliseconds) for the passphrase in this capability.
Returns:
the new object.

Methods

 o isValid
  protected boolean isValid()
Check whether the capability is still valid. When called for the first time, the user is asked to enter a password. On subsequent calls the previously entered password remains valid until it expires after the timeout specified when creating the capability. If that happens the user must enter the password again (which in turn is valid for at most timeout milliseconds).
Returns:
true if the capability is valid, false if not.
Overrides:
isValid in class Capability
See Also:
Capability
 o getPassWord
  public String getPassWord()
Check whether the capability is still valid and if so, return the true password. If not, the same procedure as for isValid() will be used. (function included on Torben's request)
Returns:
the password if valid, a null string otherwise
See Also:
isValid
 o writeObject
  public void writeObject(StreamOutputInterface s) throws StreamIOException
Implementing the Streamable interface
Throws: StreamIOException
as usual
See Also:
Streamable;
 o readObject
  public void readObject(StreamInputInterface s) throws StreamIOException
Implementing the Streamable interface
Throws: StreamIOException
as usual
See Also:
Streamable;
 o myStreamSize
  public int myStreamSize() throws StreamIOException
Implementing the Streamable interface
Throws: StreamIOException
as usual
See Also:
Streamable;

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