CASA/CASA-auth-token/non-java/client/authpolicy.c

/***********************************************************************
 * 
 *  Copyright (C) 2006 Novell, Inc. All Rights Reserved.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; version 2.1
 *  of the License.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Library Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, Novell, Inc.
 * 
 *  To contact Novell about this file by physical or electronic mail, 
 *  you may find current contact information at www.novell.com.
 * 
 *  Author: Juan Carlos Luciani <jluciani@novell.com>
 *
 ***********************************************************************/


//===[ Include files ]=====================================================

#include "internal.h"

//===[ Type definitions ]==================================================

//
// Parse states
//
#define AWAITING_ROOT_ELEMENT_START             0x0
#define AWAITING_ROOT_ELEMENT_END               0x1
#define AWAITING_AUTH_POLICY_ELEMENT_START      0x2
#define AWAITING_AUTH_POLICY_ELEMENT_END        0x3
#define AWAITING_AUTH_POLICY_DATA               0x4
#define AWAITING_AUTH_SOURCE_ELEMENT_START      0x5
#define AWAITING_AUTH_SOURCE_ELEMENT_END        0x6
#define AWAITING_AUTH_SOURCE_CHILD_START        0x7
#define AWAITING_REALM_DATA                     0x8
#define AWAITING_REALM_ELEMENT_END              0x9
#define AWAITING_MECHANISM_DATA                 0xA
#define AWAITING_MECHANISM_ELEMENT_END          0xB
#define AWAITING_MECHANISM_INFO_DATA            0xC
#define AWAITING_MECHANISM_INFO_ELEMENT_END     0xD
#define AWAITING_UNKNOWN_DATA                   0xE
#define AWAITING_UNKNOWN_ELEMENT_END            0xF
#define DONE_PARSING                            0x10

//
// Authentication Policy Parse Structure
//
typedef struct _AuthPolicyParse
{
   XML_Parser              p;
   int                     state;
   int                     elementDataProcessed;
   AuthPolicy              *pAuthPolicy;
   CasaStatus              status;

} AuthPolicyParse, *PAuthPolicyParse;


//===[ Function prototypes ]===============================================

//===[ Global variables ]==================================================

//++=======================================================================
static
void XMLCALL
AuthPolicyStartElementHandler(
   IN    AuthPolicyParse *pAuthPolicyParse,
   IN    const XML_Char *name,
   IN    const XML_Char **atts)
//
//  Arguments: 
//
//  Returns:   
//
//  Abstract:  
//
//  Notes:
//
// L2
//=======================================================================--
{
   DbgTrace(2, "-AuthPolicyStartElementHandler- Start\n", 0);

   // Proceed based on the state
   switch (pAuthPolicyParse->state)
   {
      case AWAITING_ROOT_ELEMENT_START:

         // In this state, we are only expecting the Authentication
         // Policy Element.
         if (strcmp(name, AUTH_POLICY_ELEMENT_NAME) == 0)
         {
            // Good, advance to the next state.
            pAuthPolicyParse->state = AWAITING_AUTH_SOURCE_ELEMENT_START;
         }
         else
         {
            DbgTrace(0, "-AuthPolicyStartElementHandler- Un-expected start element\n", 0);
            XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
         }
         break;

      case AWAITING_AUTH_SOURCE_ELEMENT_START:
      case AWAITING_ROOT_ELEMENT_END:
   
         // In this state, we are only expecting the start of an Authentication
         // Source Element.
         if (strcmp(name, AUTH_SOURCE_ELEMENT_NAME) == 0)
         {
            AuthContext *pAuthContext;
   
            // Create an authentication context structure
            pAuthContext = (AuthContext*) malloc(sizeof(AuthContext));
            if (pAuthContext)
            {
               // Initialize the allocated AuthContext structure and associate it
               // with the AuthPolicy structure.
               memset(pAuthContext, 0, sizeof(*pAuthContext));
               InsertTailList(&pAuthPolicyParse->pAuthPolicy->authContextListHead, &pAuthContext->listEntry);

               // Good, advance to the next state.
               pAuthPolicyParse->state = AWAITING_AUTH_SOURCE_CHILD_START;
            }
            else
            {
               DbgTrace(0, "-AuthPolicyStartElementHandler- Buffer allocation error\n", 0);
               XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
            }
         }
         else
         {
            DbgTrace(0, "-AuthPolicyStartElementHandler- Un-expected start element\n", 0);
            XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
         }
         break;

      case AWAITING_AUTH_SOURCE_CHILD_START:

         // Proceed based on the name of the element
         if (strcmp(name, REALM_ELEMENT_NAME) == 0)
         {
            // Advance to the next state.
            pAuthPolicyParse->state = AWAITING_REALM_DATA;
         }
         else if (strcmp(name, MECHANISM_ELEMENT_NAME) == 0)
         {
            // Advance to the next state.
            pAuthPolicyParse->state = AWAITING_MECHANISM_DATA;
         }
         else if (strcmp(name, MECHANISM_INFO_ELEMENT_NAME) == 0)
         {
            // Advance to the next state.
            pAuthPolicyParse->state = AWAITING_MECHANISM_INFO_DATA;
         }
         else if (strcmp(name, AUTH_SOURCE_ELEMENT_NAME) == 0)
         {
            // We are starting a new auth source entry, create an authentication
            // context structure to hold its information.
            AuthContext *pAuthContext;

            // Create an authentication context structure
            pAuthContext = (AuthContext*) malloc(sizeof(AuthContext));
            if (pAuthContext)
            {
               // Initialize the allocated AuthContext structure and associate it
               // with the AuthPolicy structure.
               memset(pAuthContext, 0, sizeof(*pAuthContext));
               InsertTailList(&pAuthPolicyParse->pAuthPolicy->authContextListHead, &pAuthContext->listEntry);
            }
            else
            {
               DbgTrace(0, "-AuthPolicyStartElementHandler- Buffer allocation error\n", 0);
               XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
            }
         }
         else
         {
            // Advance to the next state.
            pAuthPolicyParse->state = AWAITING_UNKNOWN_DATA;
         }
         break;
   
      default:
         DbgTrace(0, "-AuthPolicyStartElementHandler- Un-expected state = %d\n", pAuthPolicyParse->state);
         XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
         break;
   }

   DbgTrace(2, "-AuthPolicyStartElementHandler- End\n", 0);
}


//++=======================================================================
static
CasaStatus
ConsumeElementData(
   IN    AuthPolicyParse *pAuthPolicyParse,
   IN    const XML_Char *s,
   IN    int len,
   INOUT char **ppElementData,
   INOUT int *pElementDataLen)
//
//  Arguments: 
//
//  Returns:   
//
//  Abstract:  
//
//  Notes:
//
// L2
//=======================================================================--
{
   CasaStatus  retStatus = CASA_STATUS_SUCCESS;

   DbgTrace(3, "-ConsumeElementData- Start\n", 0);

   // Proceed based on whether or not we have already consumed data
   // for this element.
   if (*ppElementData == NULL)
   {
      // We have not yet consumed data for this element
      pAuthPolicyParse->elementDataProcessed = len;

      // Allocate a buffer to hold this element data (null terminated).
      *ppElementData = (char*) malloc(len + 1);
      if (*ppElementData)
      {
         memset(*ppElementData, 0, len + 1);
         memcpy(*ppElementData, s, len);

         // Return the length of the element data buffer
         *pElementDataLen = pAuthPolicyParse->elementDataProcessed + 1;
      }
      else
      {
         DbgTrace(0, "-ConsumeElementData- Buffer allocation failure\n", 0);
         retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
                                     CASA_FACILITY_AUTHTOKEN,
                                     CASA_STATUS_INSUFFICIENT_RESOURCES);
      }
   }
   else
   {
      char  *pNewBuf;

      // We have already received token data, append this data to it.
      pNewBuf = (char*) malloc(pAuthPolicyParse->elementDataProcessed + len + 1);
      if (pNewBuf)
      {
         memset(pNewBuf,
                0,
                pAuthPolicyParse->elementDataProcessed + len + 1);
         memcpy(pNewBuf,
                *ppElementData,
                pAuthPolicyParse->elementDataProcessed);
         memcpy(pNewBuf + pAuthPolicyParse->elementDataProcessed, s, len);
         pAuthPolicyParse->elementDataProcessed += len;

         // Swap the buffers
         free(*ppElementData);
         *ppElementData = pNewBuf;

         // Return the length of the element data buffer
         *pElementDataLen = pAuthPolicyParse->elementDataProcessed + 1;
      }
      else
      {
         DbgTrace(0, "-ConsumeElementData- Buffer allocation failure\n", 0);
         retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
                                     CASA_FACILITY_AUTHTOKEN,
                                     CASA_STATUS_INSUFFICIENT_RESOURCES);
      }
   }

   DbgTrace(3, "-ConsumeElementData- End, retStatus = %08X\n", retStatus);

   return retStatus;
}


//++=======================================================================
static
void XMLCALL
AuthPolicyCharDataHandler(
   IN    AuthPolicyParse *pAuthPolicyParse,
   IN    const XML_Char *s,
   IN    int len)
//
//  Arguments: 
//
//  Returns:   
//
//  Abstract:  
//
//  Notes:
//
// L2
//=======================================================================--
{
   AuthContext *pAuthContext;

   DbgTrace(2, "-AuthPolicyCharDataHandler- Start\n", 0);

   // Just exit if being called to process white space
   if (*s == '\n' || *s == '\r' || *s == '\t' || *s == ' ')
   {
      goto exit;
   }

   // Proceed based on the state
   switch (pAuthPolicyParse->state)
   {
      case AWAITING_REALM_DATA:

         // Get access to the AuthContext at the tail of the list
         pAuthContext = CONTAINING_RECORD(pAuthPolicyParse->pAuthPolicy->authContextListHead.Blink,
                                          AuthContext,
                                          listEntry);

         // Consume the data
         pAuthPolicyParse->status = ConsumeElementData(pAuthPolicyParse,
                                                       s,
                                                       len,
                                                       &pAuthContext->pContext,
                                                       &pAuthContext->contextLen);
         if (CASA_SUCCESS(pAuthPolicyParse->status))
         {
            // Advanced to the next state
            pAuthPolicyParse->state = AWAITING_REALM_ELEMENT_END;
         }
         else
         {
            XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
         }
         break;

      case AWAITING_MECHANISM_DATA:
      case AWAITING_MECHANISM_ELEMENT_END:

         // Get access to the AuthContext at the tail of the list
         pAuthContext = CONTAINING_RECORD(pAuthPolicyParse->pAuthPolicy->authContextListHead.Blink,
                                          AuthContext,
                                          listEntry);
   
         // Consume the data
         pAuthPolicyParse->status = ConsumeElementData(pAuthPolicyParse,
                                                       s,
                                                       len,
                                                       &pAuthContext->pMechanism,
                                                       &pAuthContext->mechanismLen);
         if (CASA_SUCCESS(pAuthPolicyParse->status))
         {
            // Advanced to the next state
            pAuthPolicyParse->state = AWAITING_MECHANISM_ELEMENT_END;
         }
         else
         {
            XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
         }
         break;

      case AWAITING_MECHANISM_INFO_DATA:
      case AWAITING_MECHANISM_INFO_ELEMENT_END:

         // Get access to the AuthContext at the tail of the list
         pAuthContext = CONTAINING_RECORD(pAuthPolicyParse->pAuthPolicy->authContextListHead.Blink,
                                          AuthContext,
                                          listEntry);
   
         // Consume the data
         pAuthPolicyParse->status = ConsumeElementData(pAuthPolicyParse,
                                                       s,
                                                       len,
                                                       &pAuthContext->pMechInfo,
                                                       &pAuthContext->mechInfoLen);
         if (CASA_SUCCESS(pAuthPolicyParse->status))
         {
            // Advanced to the next state
            pAuthPolicyParse->state = AWAITING_MECHANISM_INFO_ELEMENT_END;
         }
         else
         {
            XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
         }
         break;

      case AWAITING_UNKNOWN_DATA:
      case AWAITING_UNKNOWN_ELEMENT_END:

         // Just advance the state
         pAuthPolicyParse->state = AWAITING_UNKNOWN_ELEMENT_END;
         break;

      default:
         DbgTrace(0, "-AuthPolicyCharDataHandler- Un-expected state = %d\n", pAuthPolicyParse->state);
         XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
         break;
   }

exit:

   DbgTrace(2, "-AuthPolicyCharDataHandler- End\n", 0);
}


//++=======================================================================
static
void XMLCALL
AuthPolicyEndElementHandler(
   IN    AuthPolicyParse *pAuthPolicyParse,
   IN    const XML_Char *name)
//
//  Arguments: 
//
//  Returns:   
//
//  Abstract:  
//
//  Notes:
//
// L2
//=======================================================================--
{
   AuthContext *pAuthContext;

   DbgTrace(2, "-AuthPolicyEndElementHandler- Start\n", 0);

   // Proceed based on the state
   switch (pAuthPolicyParse->state)
   {
      case AWAITING_ROOT_ELEMENT_END:
   
         // In this state, we are only expecting the Authentication
         // Policy Element.
         if (strcmp(name, AUTH_POLICY_ELEMENT_NAME) == 0)
         {
            // Done.
            pAuthPolicyParse->state = DONE_PARSING;
         }
         else
         {
            DbgTrace(0, "-AuthPolicyEndElementHandler- Un-expected end element\n", 0);
            XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
         }
         break;

      case AWAITING_AUTH_SOURCE_CHILD_START:

         // In this state, we are only expecting the Authentication
         // Source Response Element.
         if (strcmp(name, AUTH_SOURCE_ELEMENT_NAME) == 0)
         {
            // Good, advance to the next state.
            pAuthPolicyParse->state = AWAITING_ROOT_ELEMENT_END;
         }
         else
         {
            DbgTrace(0, "-AuthPolicyEndHandler- Un-expected end element\n", 0);
            XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
         }
         break;

      case AWAITING_REALM_ELEMENT_END:
   
         // In this state, we are only expecting the Realm Element.
         if (strcmp(name, REALM_ELEMENT_NAME) == 0)
         {
            // Good, advance to the next state.
            pAuthPolicyParse->state = AWAITING_AUTH_SOURCE_CHILD_START;
         }
         else
         {
            DbgTrace(0, "-AuthPolicyEndElementHandler- Un-expected end element\n", 0);
            XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
         }
         break;

      case AWAITING_MECHANISM_ELEMENT_END:
   
         // In this state, we are only expecting the Mechanism Element.
         if (strcmp(name, MECHANISM_ELEMENT_NAME) == 0)
         {
            // Good, advance to the next state.
            pAuthPolicyParse->state = AWAITING_AUTH_SOURCE_CHILD_START;
         }
         else
         {
            DbgTrace(0, "-AuthPolicyEndElementHandler- Un-expected end element\n", 0);
            XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
         }
         break;

      case AWAITING_MECHANISM_INFO_DATA:
   
         // Get access to the AuthContext at the tail of the list
         pAuthContext = CONTAINING_RECORD(pAuthPolicyParse->pAuthPolicy->authContextListHead.Blink,
                                          AuthContext,
                                          listEntry);
   
         // There was no mechanism info data. Set it to an empty string.
         pAuthContext->pMechInfo = (char*) malloc(1);
         if (pAuthContext->pMechInfo)
         {
            *pAuthContext->pMechInfo = '\0';
         }
         else
         {
            DbgTrace(0, "-AuthPolicyEndElementHandler- Buffer allocation failure\n", 0);
            pAuthPolicyParse->status = CasaStatusBuild(CASA_SEVERITY_ERROR,
                                                       CASA_FACILITY_AUTHTOKEN,
                                                       CASA_STATUS_INSUFFICIENT_RESOURCES);
            XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
            break;
         }
         // Fall through

      case AWAITING_MECHANISM_INFO_ELEMENT_END:
   
         // In this state, we are only expecting the Mechanism Info Element.
         if (strcmp(name, MECHANISM_INFO_ELEMENT_NAME) == 0)
         {
            // Good, advance to the next state.
            pAuthPolicyParse->state = AWAITING_AUTH_SOURCE_CHILD_START;
         }
         else
         {
            DbgTrace(0, "-AuthPolicyEndElementHandler- Un-expected end element\n", 0);
            XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
         }
         break;
   
      case AWAITING_UNKNOWN_ELEMENT_END:
   
         // Advance to the next state.
         pAuthPolicyParse->state = AWAITING_AUTH_SOURCE_CHILD_START;
         break;

      default:
         DbgTrace(0, "-AuthPolicyEndElementHandler- Un-expected state = %d\n", pAuthPolicyParse->state);
         XML_StopParser(pAuthPolicyParse->p, XML_FALSE);
         break;
   }

   DbgTrace(2, "-AuthPolicyEndElementHandler- End\n", 0);
}


//++=======================================================================
CasaStatus
CreateAuthPolicy(
   IN    char *pEncodedData,
   IN    int encodedDataLen,
   INOUT AuthPolicy **ppAuthPolicy)
//
//  Arguments: 
//
//  Returns:   
//
//  Abstract:  
//
//  Notes:
//
// L2
//=======================================================================--
{
   CasaStatus        retStatus;
   AuthPolicy        *pAuthPolicy = NULL;
   AuthPolicyParse   authPolicyParse = {0};
   char              *pData = NULL;
   int               dataLen = 0;

   DbgTrace(1, "-CreateAuthPolicy- Start\n", 0);

   /*
   * An authentication policy document has the following format:
   * 
   * <?xml version="1.0" encoding="ISO-8859-1"?>
   * <auth_policy>
   * <auth_source>
   * <realm>realm name</realm>
   * <mechanism>authentication mechanism type</mechanism>
   * <mechanism_info>authentication mechanism context data</mechanism_info>
   * </auth_source>
   * ...
   * </auth_policy>
   *
   * The authentication policy document can contain multiple auth_source
   * elements. These auth_source elements can be for different authentication
   * sources or for the same authentication source but specifying a different
   * authentication mechanism. The mechanism_info element is optional.
   *
   * The following is a sample authentication policy document:
   *
   * <?xml version="1.0" encoding="ISO-8859-1"?>
   * <auth_policy>
   * <auth_source>
   * <realm>Corp_eDirTree</realm>
   * <mechanism>Krb5Authenticate</mechanism>
   * <mechanism_info>host/hostname</mechanism_info>
   * </auth_source>
   * <auth_source>
   * <realm>Corp_eDirTree</realm>
   * <mechanism>PwdAuthenticate</mechanism>
   * <mechanism_info></mechanism_info>
   * </auth_source>
   * </auth_policy>
   *
   * This authentication policy would tell the CASA client that it can
   * authenticate to the CASA Authentication Token Service using
   * credentials for the Corp_eDirTree and utilizing either the
   * Krb5 authentication mechanism or the Pwd authentication mechanism.
   * The Krb5 authentication mechanism context data specifies the
   * name of the Kerberos service principal.
   * 
   */

   // Initialize output parameter
   *ppAuthPolicy = NULL;

   // Decode the data
   retStatus = DecodeData(pEncodedData,
                          encodedDataLen,
                          (void**) &pData,
                          &dataLen);
   if (CASA_SUCCESS(retStatus))
   {
      // Allocate space for the AuthPolicy structure
      pAuthPolicy = (AuthPolicy*) malloc(sizeof(*pAuthPolicy));
      if (pAuthPolicy)
      {
         XML_Parser  p;

         // Initialize the AuthPolicy object
         memset(pAuthPolicy, 0, sizeof(*pAuthPolicy));
         InitializeListHead(&pAuthPolicy->authContextListHead);

         // Set the AuthPolicy object in the parse object
         authPolicyParse.pAuthPolicy = pAuthPolicy;

         // Create parser
         p = XML_ParserCreate(NULL);
         if (p)
         {
            // Keep track of the parser in our parse object
            authPolicyParse.p = p;

            // Initialize the status within the parse object
            authPolicyParse.status = CASA_STATUS_SUCCESS;

            // Set the start and end element handlers
            XML_SetElementHandler(p,
                                  (XML_StartElementHandler) AuthPolicyStartElementHandler,
                                  (XML_EndElementHandler) AuthPolicyEndElementHandler);

            // Set the character data handler
            XML_SetCharacterDataHandler(p, (XML_CharacterDataHandler) AuthPolicyCharDataHandler);

            // Set our user data
            XML_SetUserData(p, &authPolicyParse);

            // Parse the document
            if (XML_Parse(p, pData, dataLen, 1) == XML_STATUS_OK)
            {
               // Verify that the parse operation completed successfully
               if (authPolicyParse.state == DONE_PARSING)
               {
                  // The parse operation succeded
                  retStatus = CASA_STATUS_SUCCESS;
               }
               else
               {
                  DbgTrace(0, "-CreateAuthPolicy- Parse operation did not complete\n", 0);

                  retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
                                              CASA_FACILITY_AUTHTOKEN,
                                              CASA_STATUS_PROTOCOL_ERROR);
               }
            }
            else
            {
               DbgTrace(0, "-CreateAuthPolicy- Parse error %d\n", XML_GetErrorCode(p));
               retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
                                           CASA_FACILITY_AUTHTOKEN,
                                           CASA_STATUS_PROTOCOL_ERROR);
            }

            // Free the parser
            XML_ParserFree(p);
         }
         else
         {
            DbgTrace(0, "-CreateAuthPolicy- Parser creation error\n", 0);
            retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
                                        CASA_FACILITY_AUTHTOKEN,
                                        CASA_STATUS_INSUFFICIENT_RESOURCES);
         }

         // Return the AuthPolicy object to the caller if necessary
         if (CASA_SUCCESS(retStatus))
         {
            *ppAuthPolicy = pAuthPolicy;

            // Forget about the AuthPolicy object so that it is not release down below
            pAuthPolicy = NULL;
         }
      }
      else
      {
         DbgTrace(0, "-CreateAuthPolicy- Buffer allocation error\n", 0);
         retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
                                     CASA_FACILITY_AUTHTOKEN,
                                     CASA_STATUS_INSUFFICIENT_RESOURCES);
      }
   }
   else
   {
      DbgTrace(0, "-CreateAuthPolicy- Buffer allocation error\n", 0);
      retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
                                  CASA_FACILITY_AUTHTOKEN,
                                  CASA_STATUS_INSUFFICIENT_RESOURCES);
   }

   // Release necessary allocated resources
   if (pAuthPolicy)
      RelAuthPolicy(pAuthPolicy);

   if (pData)
      free(pData);

   DbgTrace(1, "-CreateAuthPolicy- End, retStatus = %08X\n", retStatus);

   return retStatus;
}


//++=======================================================================
void
RelAuthPolicy(
   IN    AuthPolicy *pAuthPolicy)
//
//  Arguments: 
//
//  Returns:   
//
//  Abstract:  
//
//  Notes:
//
// L2
//=======================================================================--
{
   LIST_ENTRY  *pListEntry;

   DbgTrace(1, "-RelAuthPolicy- Start\n", 0);

   // Free all of the associated AuthContexts
   pListEntry = pAuthPolicy->authContextListHead.Flink;
   while (pListEntry != &pAuthPolicy->authContextListHead)
   {
      AuthContext *pAuthContext;

      // Get pointer to AuthContext structure
      pAuthContext = CONTAINING_RECORD(pListEntry, AuthContext, listEntry);

      // Free associated buffers
      if (pAuthContext->pContext)
         free(pAuthContext->pContext);
         
      if (pAuthContext->pMechanism)
         free(pAuthContext->pMechanism);
         
      if (pAuthContext->pMechInfo)
         free(pAuthContext->pMechInfo);

      // Remove the entry from the list
      RemoveEntryList(&pAuthContext->listEntry);

      // Free the AuthContext
      free(pAuthContext);

      // Advance to the next entry
      pListEntry = pAuthPolicy->authContextListHead.Flink;
   }

   // Free the AuthPolicy
   free(pAuthPolicy);

   DbgTrace(1, "-RelAuthPolicy- End\n", 0);
}


//++=======================================================================
//++=======================================================================
//++=======================================================================