//%2003////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2000, 2001, 2002  BMC Software, Hewlett-Packard Development
// Company, L. P., IBM Corp., The Open Group, Tivoli Systems.
// Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L. P.;
// IBM Corp.; EMC Corporation, The Open Group.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN
// ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED
// "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
// LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//==============================================================================
//
// Author: Nag Boranna, Hewlett-Packard Company(nagaraja_boranna@hp.com)
//
// Modified By:
//
//%/////////////////////////////////////////////////////////////////////////////


#include <Pegasus/Common/System.h>
#include <Pegasus/Common/Tracer.h>
#include <Pegasus/Common/Destroyer.h>
#include <Pegasus/Config/ConfigManager.h>
#include <Pegasus/Security/UserManager/UserExceptions.h>

#include "SecureBasicAuthenticator.h"

#ifdef PEGASUS_OS_OS400
#include "qycmutiltyUtility.H"
#include "OS400ConvertChar.h"
#endif
#ifdef PEGASUS_OS_ZOS
#include <pwd.h>
#endif

PEGASUS_USING_STD;

PEGASUS_NAMESPACE_BEGIN


/**
    Constant representing the Basic authentication challenge header.
*/
static const String BASIC_CHALLENGE_HEADER = "WWW-Authenticate: Basic \"";



/* constructor. */
SecureBasicAuthenticator::SecureBasicAuthenticator() 
{ 
    PEG_METHOD_ENTER(TRC_AUTHENTICATION,
        "SecureBasicAuthenticator::SecureBasicAuthenticator()");

    //
    // get the local system name
    //
    _realm.assign(System::getHostName());

    //
    // get the configured port number
    //
    ConfigManager* configManager = ConfigManager::getInstance();

    String port = configManager->getCurrentValue("httpPort");

    //
    // Create realm that will be used for Basic challenges
    //
    _realm.append(":");
    _realm.append(port);

    //
    // Get a user manager instance handler
    //
    _userManager = UserManager::getInstance();

    PEG_METHOD_EXIT();
}

/* destructor. */
SecureBasicAuthenticator::~SecureBasicAuthenticator() 
{ 
    PEG_METHOD_ENTER(TRC_AUTHENTICATION,
        "SecureBasicAuthenticator::~SecureBasicAuthenticator()");

    PEG_METHOD_EXIT();
}

Boolean SecureBasicAuthenticator::authenticate(
    const String& userName, 
    const String& password) 
{
    PEG_METHOD_ENTER(TRC_AUTHENTICATION,
        "SecureBasicAuthenticator::authenticate()");

    Boolean authenticated = false;

#ifdef PEGASUS_OS_OS400
    // Use OS400 APIs to do user name and password verification
    // (note - need to convert to EBCDIC before calling ycm)
    CString userCStr = userName.getCString();
    const char * user = (const char *)userCStr;
    AtoE((char *)user);
    CString pwCStr = password.getCString();
    const char * pw = (const char *)pwCStr;
    AtoE((char *)pw);
    int os400auth =
      ycmVerifyUserAuthorization(user, pw);
    if (os400auth == TRUE) 
		authenticated = true;
	#else
	#if defined(PEGASUS_OS_ZOS)
		// use zOS API to do the user name and password verification
		// note: write possible errors to the tracelog
		if (__passwd((const char*) userName.getCString(), (const char*) password.getCString(), NULL) == 0) 
		{
			authenticated = true;
		}
		else
		{
			authenticated = false;
			PEG_TRACE_STRING(TRC_AUTHENTICATION, Tracer::LEVEL4,"Authentication failed.");
		}
#else
    //
    // Check if the user is a valid system user
    //
    if ( !System::isSystemUser( userName.getCString() ) )
    {
        PEG_METHOD_EXIT();
        return (authenticated);
    }

    try
    {
        //
        // Verify the CIM user password
        //
        if (_userManager->verifyCIMUserPassword( userName, password ))
        {
            authenticated = true;
        }
    }
    catch (InvalidUser& iu)
    {
        PEG_METHOD_EXIT();
        return (authenticated);
    }
    catch (Exception& e)
    {
        PEG_METHOD_EXIT();
        throw e;
    }
#endif	// PEGASUS_OS_ZOS
#endif

    PEG_METHOD_EXIT();

    return (authenticated);
}


//
// Create authentication response header
//
String SecureBasicAuthenticator::getAuthResponseHeader()
{
    PEG_METHOD_ENTER(TRC_AUTHENTICATION,
        "SecureBasicAuthenticator::getAuthResponseHeader()");

    // 
    // build response header using realm
    //
    String responseHeader = BASIC_CHALLENGE_HEADER;
    responseHeader.append(_realm);
    responseHeader.append("\"");

    PEG_METHOD_EXIT();

    return (responseHeader);
}


PEGASUS_NAMESPACE_END
