pull up r19221 from trunk

pull up r19221 from trunk

 r19221@cathode-dark-space:  jaltman | 2007-03-13 02:35:13 -0400
 ticket: new
 subject: KFW: Vista Integrated Logon
 component: windows

         On Windows Vista the GINA architecture was removed.  As a side
         effect the support for the Logon Event Handlers was also removed.
         The KFW Integrated Logon functionality relies on the "Logon"
         event handler to migrate the user's tickets from a secure FILE:
         ccache to an API: ccache so that the tickets will be available
         to NetIDMgr and all other Kerberos applications.

         This functionality is especially important on Vista for
         accounts that are members of the Administrators group because
         the User Account Control (UAC) restricts access to the session
         keys of all tickets in the MSLSA ccache.  The only way for
         tickets to be made available to MIT Kerberos applications is
         by obtaining them within the Network Provider and pushing them
         into the Logon Session.

         This patch replaces the missing Logon Event Handler support
         with a new exported function "LogonEventHandler" which adheres
         to the rundll32.exe specifications.  The "LogonEventHandler"
         function accepts as input the name of a FILE ccache and moves
         the contents into an API: ccache and then deletes the FILE
         ccache.

         In order for this to work the FILE ccache must be owned by
         the account that was used to logon to the current session.
         The NPLogonNotify() function must therefore lookup the SID
         for the active account, assign an appropriate DACL to the
         ccache file, and change the owner.  In addition, when Vista
         is in use a LogonScript must be constructed that will perform
         the call to rundll32.exe.

         Other changes include altering the prototype of
         KFW_copy_ccache_system_file to accept a filename instead of
         the LogonID.  This improves the abstraction and allows the
         filename to be computed once and passed into multiple
         functions from NPLogonNotify().

         Many debugging calls were added to assist with implementation.
         #define DEBUG 1 at the top of kfwcommon.c when you wish to
         build with debugging that generates entries in the Windows
         Application Event Viewer.

 	It is important to note that Integrated Logon attempts to
 	logon the username within the default realm within the
 	krb5.ini file using the provided password.  This is so
 	a local machine account name matching the default realm
 	can obtain Kerberos tickets by synchronizing the password.

ticket: 5469

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-6@19334 dc483132-0cff-0310-8789-dd5450dbe970