source: trunk/server/source3/winbindd/idmap_rid.c

/*
 *  idmap_rid: static map between Active Directory/NT RIDs and RFC 2307 accounts
 *  Copyright (C) Guenther Deschner, 2004
 *  Copyright (C) Sumit Bose, 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 "winbindd.h"
#include "idmap.h"
#include "../libcli/security/dom_sid.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_IDMAP

struct idmap_rid_context {
        uint32_t base_rid;
};

/******************************************************************************
  compat params can't be used because of the completely different way
  we support multiple domains in the new idmap
 *****************************************************************************/

static NTSTATUS idmap_rid_initialize(struct idmap_domain *dom)
{
        NTSTATUS ret;
        struct idmap_rid_context *ctx;
        char *config_option = NULL;

        ctx = TALLOC_ZERO_P(dom, struct idmap_rid_context);
        if (ctx == NULL) {
                DEBUG(0, ("Out of memory!\n"));
                return NT_STATUS_NO_MEMORY;
        }

        config_option = talloc_asprintf(ctx, "idmap config %s", dom->name);
        if ( ! config_option) {
                DEBUG(0, ("Out of memory!\n"));
                ret = NT_STATUS_NO_MEMORY;
                goto failed;
        }

        ctx->base_rid = lp_parm_int(-1, config_option, "base_rid", 0);

        dom->private_data = ctx;

        talloc_free(config_option);
        return NT_STATUS_OK;

failed:
        talloc_free(ctx);
        return ret;
}

static NTSTATUS idmap_rid_id_to_sid(struct idmap_domain *dom, struct id_map *map)
{
        struct winbindd_domain *domain;
        struct idmap_rid_context *ctx;

        ctx = talloc_get_type(dom->private_data, struct idmap_rid_context);

        /* apply filters before checking */
        if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
                DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
                                map->xid.id, dom->low_id, dom->high_id));
                return NT_STATUS_NONE_MAPPED;
        }

        domain = find_domain_from_name_noinit(dom->name);
        if (domain == NULL ) {
                return NT_STATUS_NO_SUCH_DOMAIN;
        }

        sid_compose(map->sid, &domain->sid, map->xid.id - dom->low_id + ctx->base_rid);

        /* We **really** should have some way of validating 
           the SID exists and is the correct type here.  But 
           that is a deficiency in the idmap_rid design. */

        map->status = ID_MAPPED;

        return NT_STATUS_OK;
}

/**********************************
 Single sid to id lookup function. 
**********************************/

static NTSTATUS idmap_rid_sid_to_id(struct idmap_domain *dom, struct id_map *map)
{
        uint32_t rid;
        struct idmap_rid_context *ctx;

        ctx = talloc_get_type(dom->private_data, struct idmap_rid_context);

        sid_peek_rid(map->sid, &rid);
        map->xid.id = rid - ctx->base_rid + dom->low_id;

        /* apply filters before returning result */

        if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
                DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
                                map->xid.id, dom->low_id, dom->high_id));
                map->status = ID_UNMAPPED;
                return NT_STATUS_NONE_MAPPED;
        }

        map->status = ID_MAPPED;

        return NT_STATUS_OK;
}

/**********************************
 lookup a set of unix ids. 
**********************************/

static NTSTATUS idmap_rid_unixids_to_sids(struct idmap_domain *dom, struct id_map **ids)
{
        NTSTATUS ret;
        int i;

        /* initialize the status to avoid suprise */
        for (i = 0; ids[i]; i++) {
                ids[i]->status = ID_UNKNOWN;
        }

        for (i = 0; ids[i]; i++) {

                ret = idmap_rid_id_to_sid(dom, ids[i]);

                if (( ! NT_STATUS_IS_OK(ret)) &&
                    ( ! NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
                        /* some fatal error occurred, log it */
                        DEBUG(3, ("Unexpected error resolving an ID (%d)\n", ids[i]->xid.id));
                }
        }

        return NT_STATUS_OK;
}

/**********************************
 lookup a set of sids. 
**********************************/

static NTSTATUS idmap_rid_sids_to_unixids(struct idmap_domain *dom, struct id_map **ids)
{
        NTSTATUS ret;
        int i;

        /* initialize the status to avoid suprise */
        for (i = 0; ids[i]; i++) {
                ids[i]->status = ID_UNKNOWN;
        }

        for (i = 0; ids[i]; i++) {

                ret = idmap_rid_sid_to_id(dom, ids[i]);

                if (( ! NT_STATUS_IS_OK(ret)) &&
                    ( ! NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
                        /* some fatal error occurred, log it */
                        DEBUG(3, ("Unexpected error resolving a SID (%s)\n",
                                  sid_string_dbg(ids[i]->sid)));
                }
        }

        return NT_STATUS_OK;
}

static struct idmap_methods rid_methods = {
        .init = idmap_rid_initialize,
        .unixids_to_sids = idmap_rid_unixids_to_sids,
        .sids_to_unixids = idmap_rid_sids_to_unixids,
};

NTSTATUS idmap_rid_init(void)
{
        return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "rid", &rid_methods);
}