source: vendor/3.5.11/source3/lib/util_nttoken.c

/* 
 *  Unix SMB/CIFS implementation.
 *  Authentication utility functions
 *  Copyright (C) Andrew Tridgell 1992-1998
 *  Copyright (C) Andrew Bartlett 2001
 *  Copyright (C) Jeremy Allison 2000-2001
 *  Copyright (C) Rafal Szczesniak 2002
 *  Copyright (C) Volker Lendecke 2006
 *  Copyright (C) Michael Adam 2007
 *  Copyright (C) Guenther Deschner 2007
 *
 *  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 3 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/>.
 */

/* function(s) moved from auth/auth_util.c to minimize linker deps */

#include "includes.h"

/****************************************************************************
 Duplicate a SID token.
****************************************************************************/

NT_USER_TOKEN *dup_nt_token(TALLOC_CTX *mem_ctx, const NT_USER_TOKEN *ptoken)
{
        NT_USER_TOKEN *token;

        if (!ptoken)
                return NULL;

        token = TALLOC_ZERO_P(mem_ctx, NT_USER_TOKEN);
        if (token == NULL) {
                DEBUG(0, ("talloc failed\n"));
                return NULL;
        }

        if (ptoken->user_sids && ptoken->num_sids) {
                token->user_sids = (DOM_SID *)talloc_memdup(
                        token, ptoken->user_sids, sizeof(DOM_SID) * ptoken->num_sids );

                if (token->user_sids == NULL) {
                        DEBUG(0, ("talloc_memdup failed\n"));
                        TALLOC_FREE(token);
                        return NULL;
                }
                token->num_sids = ptoken->num_sids;
        }
        
        /* copy the privileges; don't consider failure to be critical here */
        
        if ( !se_priv_copy( &token->privileges, &ptoken->privileges ) ) {
                DEBUG(0,("dup_nt_token: Failure to copy SE_PRIV!.  "
                         "Continuing with 0 privileges assigned.\n"));
        }

        return token;
}

/****************************************************************************
 merge NT tokens
****************************************************************************/

NTSTATUS merge_nt_token(TALLOC_CTX *mem_ctx,
                        const struct nt_user_token *token_1,
                        const struct nt_user_token *token_2,
                        struct nt_user_token **token_out)
{
        struct nt_user_token *token = NULL;
        NTSTATUS status;
        int i;

        if (!token_1 || !token_2 || !token_out) {
                return NT_STATUS_INVALID_PARAMETER;
        }

        token = TALLOC_ZERO_P(mem_ctx, struct nt_user_token);
        NT_STATUS_HAVE_NO_MEMORY(token);

        for (i=0; i < token_1->num_sids; i++) {
                status = add_sid_to_array_unique(mem_ctx,
                                                 &token_1->user_sids[i],
                                                 &token->user_sids,
                                                 &token->num_sids);
                if (!NT_STATUS_IS_OK(status)) {
                        TALLOC_FREE(token);
                        return status;
                }
        }

        for (i=0; i < token_2->num_sids; i++) {
                status = add_sid_to_array_unique(mem_ctx,
                                                 &token_2->user_sids[i],
                                                 &token->user_sids,
                                                 &token->num_sids);
                if (!NT_STATUS_IS_OK(status)) {
                        TALLOC_FREE(token);
                        return status;
                }
        }

        se_priv_add(&token->privileges, &token_1->privileges);
        se_priv_add(&token->privileges, &token_2->privileges);

        *token_out = token;

        return NT_STATUS_OK;
}

/*******************************************************************
 Check if this ACE has a SID in common with the token.
********************************************************************/

bool token_sid_in_ace(const NT_USER_TOKEN *token, const struct security_ace *ace)
{
        size_t i;

        for (i = 0; i < token->num_sids; i++) {
                if (sid_equal(&ace->trustee, &token->user_sids[i]))
                        return true;
        }

        return false;
}