/* Editor Settings: expandtabs and use 4 spaces for indentation
 * ex: set softtabstop=4 tabstop=8 expandtab shiftwidth=4: *
 * -*- mode: c, c-basic-offset: 4 -*- */

/*
 * Copyright Likewise Software    2004-2008
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program 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 General Public License
 * for more details.  You should have received a copy of the GNU General
 * Public License along with this program.  If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * LIKEWISE SOFTWARE MAKES THIS SOFTWARE AVAILABLE UNDER OTHER LICENSING
 * TERMS AS WELL.  IF YOU HAVE ENTERED INTO A SEPARATE LICENSE AGREEMENT
 * WITH LIKEWISE SOFTWARE, THEN YOU MAY ELECT TO USE THE SOFTWARE UNDER THE
 * TERMS OF THAT SOFTWARE LICENSE AGREEMENT INSTEAD OF THE TERMS OF THE GNU
 * GENERAL PUBLIC LICENSE, NOTWITHSTANDING THE ABOVE NOTICE.  IF YOU
 * HAVE QUESTIONS, OR WISH TO REQUEST A COPY OF THE ALTERNATE LICENSING
 * TERMS OFFERED BY LIKEWISE SOFTWARE, PLEASE CONTACT LIKEWISE SOFTWARE AT
 * license@likewisesoftware.com
 */

/*
 * Copyright (C) Likewise Software. All rights reserved.
 *
 * Module Name:
 *
 *        lpaccess.c
 *
 * Abstract:
 *
 *        Likewise Security and Authentication Subsystem (LSASS)
 *
 *        Local Authentication Provider
 *
 *        Access Check API
 *
 * Authors: Krishna Ganugapati (krishnag@likewisesoftware.com)
 *          Sriram Nambakam (snambakam@likewisesoftware.com)
 */

#include "includes.h"

DWORD
LocalCheckForAddAccess(
    HANDLE hProvider
    )
{
    DWORD dwError = 0;
    BOOLEAN bIsAdmin = FALSE;

    dwError = LocalCheckIsAdministrator(hProvider, &bIsAdmin);
    BAIL_ON_LSA_ERROR(dwError);

    if (!bIsAdmin)
    {
        dwError = EACCES;
    }

error:

    return dwError;
}

DWORD
LocalCheckForModifyAccess(
    HANDLE hProvider
    )
{
    DWORD dwError = 0;
    BOOLEAN bIsAdmin = FALSE;

    dwError = LocalCheckIsAdministrator(hProvider, &bIsAdmin);
    BAIL_ON_LSA_ERROR(dwError);

    if (!bIsAdmin)
    {
        dwError = EACCES;
    }

error:

    return dwError;
}

DWORD
LocalCheckForPasswordChangeAccess(
    HANDLE hProvider,
    uid_t  targetUid
    )
{
    DWORD dwError = 0;
    PLOCAL_PROVIDER_CONTEXT pContext = (PLOCAL_PROVIDER_CONTEXT)hProvider;

    if (pContext->uid != targetUid)
    {
        BOOLEAN bIsAdmin = FALSE;

        dwError = LocalCheckIsAdministrator(hProvider, &bIsAdmin);
        BAIL_ON_LSA_ERROR(dwError);

        if (!bIsAdmin)
        {
            dwError = EACCES;
        }
    }

error:

    return dwError;
}

DWORD
LocalCheckForQueryAccess(
    HANDLE hProvider
    )
{
    return LW_ERROR_SUCCESS;
}

DWORD
LocalCheckForDeleteAccess(
    HANDLE hProvider
    )
{
    DWORD dwError = 0;
    BOOLEAN bIsAdmin = FALSE;

    dwError = LocalCheckIsAdministrator(hProvider, &bIsAdmin);
    BAIL_ON_LSA_ERROR(dwError);

    if (!bIsAdmin)
    {
        dwError = EACCES;
    }

error:

    return dwError;
}

DWORD
LocalCheckIsAdministrator(
    HANDLE   hProvider,
    PBOOLEAN pbIsAdmin
    )
{
    DWORD dwError = 0;
    PLOCAL_PROVIDER_CONTEXT pContext = (PLOCAL_PROVIDER_CONTEXT)hProvider;
    BOOLEAN bIsAdmin = FALSE;
    BOOLEAN bInLock = FALSE;

    BAIL_ON_INVALID_HANDLE(hProvider);

    pthread_mutex_lock(&pContext->mutex);
    bInLock = TRUE;

    switch (pContext->localAdminState)
    {
        case LOCAL_ADMIN_STATE_NOT_DETERMINED:

            dwError = LocalDirCheckIfAdministrator(
                                hProvider,
                                pContext->uid,
                                &bIsAdmin);
            BAIL_ON_LSA_ERROR(dwError);

            pContext->localAdminState = (bIsAdmin ? LOCAL_ADMIN_STATE_IS_ADMIN :
                                                LOCAL_ADMIN_STATE_IS_NOT_ADMIN);

            break;

        case LOCAL_ADMIN_STATE_IS_ADMIN:

            bIsAdmin = TRUE;

            break;

        case LOCAL_ADMIN_STATE_IS_NOT_ADMIN:

            bIsAdmin = FALSE;

            break;
    }

    *pbIsAdmin = bIsAdmin;

cleanup:

    if (bInLock)
    {
        pthread_mutex_unlock(&pContext->mutex);
    }

    return dwError;

error:

    *pbIsAdmin = FALSE;

    goto cleanup;
}