source: branches/samba-3.5.x/source4/dsdb/samdb/samdb_privilege.c

/* 
   Unix SMB/CIFS implementation.

   manipulate privilege records in samdb

   Copyright (C) Andrew Tridgell 2004
   
   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/>.
*/

#include "includes.h"
#include "libcli/ldap/ldap_ndr.h"
#include "dsdb/samdb/samdb.h"
#include "auth/auth.h"
#include "libcli/security/security.h"
#include "../lib/util/util_ldb.h"
#include "param/param.h"

/*
  add privilege bits for one sid to a security_token
*/
static NTSTATUS samdb_privilege_setup_sid(void *samctx, TALLOC_CTX *mem_ctx,
                                          struct security_token *token,
                                          const struct dom_sid *sid)
{
        const char * const attrs[] = { "privilege", NULL };
        struct ldb_message **res = NULL;
        struct ldb_message_element *el;
        int ret, i;
        char *sidstr;

        sidstr = ldap_encode_ndr_dom_sid(mem_ctx, sid);
        NT_STATUS_HAVE_NO_MEMORY(sidstr);

        ret = gendb_search(samctx, mem_ctx, NULL, &res, attrs, "objectSid=%s", sidstr);
        talloc_free(sidstr);
        if (ret != 1) {
                /* not an error to not match */
                return NT_STATUS_OK;
        }

        el = ldb_msg_find_element(res[0], "privilege");
        if (el == NULL) {
                return NT_STATUS_OK;
        }

        for (i=0;i<el->num_values;i++) {
                const char *priv_str = (const char *)el->values[i].data;
                enum sec_privilege privilege = sec_privilege_id(priv_str);
                if (privilege == -1) {
                        DEBUG(1,("Unknown privilege '%s' in samdb\n",
                                 priv_str));
                        continue;
                }
                security_token_set_privilege(token, privilege);
        }

        return NT_STATUS_OK;
}

/*
  setup the privilege mask for this security token based on our
  local SAM
*/
NTSTATUS samdb_privilege_setup(struct tevent_context *ev_ctx, 
                               struct loadparm_context *lp_ctx, struct security_token *token)
{
        void *samctx;
        TALLOC_CTX *mem_ctx;
        int i;
        NTSTATUS status;

        /* Shortcuts to prevent recursion and avoid lookups */
        if (token->user_sid == NULL) {
                token->privilege_mask = 0;
                return NT_STATUS_OK;
        }

        if (security_token_is_system(token)) {
                token->privilege_mask = ~0;
                return NT_STATUS_OK;
        }

        if (security_token_is_anonymous(token)) {
                token->privilege_mask = 0;
                return NT_STATUS_OK;
        }

        mem_ctx = talloc_new(token);
        samctx = samdb_connect(mem_ctx, ev_ctx, lp_ctx, system_session(mem_ctx, lp_ctx));
        if (samctx == NULL) {
                talloc_free(mem_ctx);
                return NT_STATUS_INTERNAL_DB_CORRUPTION;
        }

        token->privilege_mask = 0;
        
        for (i=0;i<token->num_sids;i++) {
                status = samdb_privilege_setup_sid(samctx, mem_ctx,
                                                   token, token->sids[i]);
                if (!NT_STATUS_IS_OK(status)) {
                        talloc_free(mem_ctx);
                        return status;
                }
        }

        talloc_free(mem_ctx);

        return NT_STATUS_OK;    
}