source: vendor/current/source3/winbindd/wb_sids2xids.c

/*
   Unix SMB/CIFS implementation.
   async sids2xids
   Copyright (C) Volker Lendecke 2011
   Copyright (C) Michael Adam 2012

   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 "../libcli/security/security.h"
#include "idmap_cache.h"
#include "librpc/gen_ndr/ndr_winbind_c.h"
#include "lsa.h"

struct wb_sids2xids_state {
        struct tevent_context *ev;

        struct dom_sid *sids;
        uint32_t num_sids;

        struct id_map *cached;

        struct dom_sid *non_cached;
        uint32_t num_non_cached;

        /*
         * Domain array to use for the idmap call. The output from
         * lookupsids cannot be used directly since for migrated
         * objects the returned domain SID can be different that the
         * original one. The new domain SID cannot be combined with
         * the RID from the previous domain.
         *
         * The proper way would be asking for the correct RID in the
         * new domain, but this approach avoids id mappings for
         * invalid SIDs.
         */
        struct lsa_RefDomainList *idmap_doms;

        struct wbint_TransIDArray ids;
};


static bool wb_sids2xids_in_cache(struct dom_sid *sid, struct id_map *map);
static void wb_sids2xids_lookupsids_done(struct tevent_req *subreq);
static void wb_sids2xids_done(struct tevent_req *subreq);

struct tevent_req *wb_sids2xids_send(TALLOC_CTX *mem_ctx,
                                     struct tevent_context *ev,
                                     const struct dom_sid *sids,
                                     const uint32_t num_sids)
{
        struct tevent_req *req, *subreq;
        struct wb_sids2xids_state *state;
        uint32_t i;

        req = tevent_req_create(mem_ctx, &state,
                                struct wb_sids2xids_state);
        if (req == NULL) {
                return NULL;
        }

        state->ev = ev;

        state->num_sids = num_sids;

        state->sids = talloc_zero_array(state, struct dom_sid, num_sids);
        if (tevent_req_nomem(state->sids, req)) {
                return tevent_req_post(req, ev);
        }

        for (i = 0; i < num_sids; i++) {
                sid_copy(&state->sids[i], &sids[i]);
        }

        state->cached = talloc_zero_array(state, struct id_map, num_sids);
        if (tevent_req_nomem(state->cached, req)) {
                return tevent_req_post(req, ev);
        }

        state->non_cached = talloc_array(state, struct dom_sid, num_sids);
        if (tevent_req_nomem(state->non_cached, req)) {
                return tevent_req_post(req, ev);
        }

        /*
         * Extract those sids that can not be resolved from cache
         * into a separate list to be handed to id mapping, keeping
         * the same index.
         */
        for (i=0; i<state->num_sids; i++) {

                DEBUG(10, ("SID %d: %s\n", (int)i,
                           sid_string_dbg(&state->sids[i])));

                if (wb_sids2xids_in_cache(&state->sids[i], &state->cached[i])) {
                        continue;
                }
                sid_copy(&state->non_cached[state->num_non_cached],
                         &state->sids[i]);
                state->num_non_cached += 1;
        }

        if (state->num_non_cached == 0) {
                tevent_req_done(req);
                return tevent_req_post(req, ev);
        }

        subreq = wb_lookupsids_send(state, ev, state->non_cached,
                                    state->num_non_cached);
        if (tevent_req_nomem(subreq, req)) {
                return tevent_req_post(req, ev);
        }
        tevent_req_set_callback(subreq, wb_sids2xids_lookupsids_done, req);
        return req;
}

static bool wb_sids2xids_in_cache(struct dom_sid *sid, struct id_map *map)
{
        struct unixid id;
        bool expired;

        if (!winbindd_use_idmap_cache()) {
                return false;
        }
        if (idmap_cache_find_sid2unixid(sid, &id, &expired)) {
                if (expired && is_domain_online(find_our_domain())) {
                        return false;
                }
                map->sid = sid;
                map->xid = id;
                map->status = ID_MAPPED;
                return true;
        }
        return false;
}

static enum id_type lsa_SidType_to_id_type(const enum lsa_SidType sid_type);

static void wb_sids2xids_lookupsids_done(struct tevent_req *subreq)
{
        struct tevent_req *req = tevent_req_callback_data(
                subreq, struct tevent_req);
        struct wb_sids2xids_state *state = tevent_req_data(
                req, struct wb_sids2xids_state);
        struct lsa_RefDomainList *domains = NULL;
        struct lsa_TransNameArray *names = NULL;
        struct winbindd_child *child;
        NTSTATUS status;
        int i;

        status = wb_lookupsids_recv(subreq, state, &domains, &names);
        TALLOC_FREE(subreq);
        if (tevent_req_nterror(req, status)) {
                return;
        }

        state->ids.num_ids = state->num_non_cached;
        state->ids.ids = talloc_array(state, struct wbint_TransID,
                                      state->num_non_cached);
        if (tevent_req_nomem(state->ids.ids, req)) {
                return;
        }

        state->idmap_doms = talloc_zero(state, struct lsa_RefDomainList);
        if (tevent_req_nomem(state->idmap_doms, req)) {
                return;
        }

        for (i=0; i<state->num_non_cached; i++) {
                struct dom_sid dom_sid;
                struct lsa_DomainInfo *info;
                struct lsa_TranslatedName *n = &names->names[i];
                struct wbint_TransID *t = &state->ids.ids[i];
                int domain_index;

                sid_copy(&dom_sid, &state->non_cached[i]);
                sid_split_rid(&dom_sid, &t->rid);

                info = &domains->domains[n->sid_index];
                t->type = lsa_SidType_to_id_type(n->sid_type);

                domain_index = init_lsa_ref_domain_list(
                        state, state->idmap_doms, info->name.string, &dom_sid);
                if (domain_index == -1) {
                        tevent_req_oom(req);
                        return;
                }
                t->domain_index = domain_index;

                t->xid.id = UINT32_MAX;
                t->xid.type = t->type;
        }

        TALLOC_FREE(names);
        TALLOC_FREE(domains);

        child = idmap_child();

        subreq = dcerpc_wbint_Sids2UnixIDs_send(
                state, state->ev, child->binding_handle, state->idmap_doms,
                &state->ids);
        if (tevent_req_nomem(subreq, req)) {
                return;
        }
        tevent_req_set_callback(subreq, wb_sids2xids_done, req);
}

static enum id_type lsa_SidType_to_id_type(const enum lsa_SidType sid_type)
{
        enum id_type type;

        switch(sid_type) {
        case SID_NAME_COMPUTER:
        case SID_NAME_USER:
                type = ID_TYPE_UID;
                break;
        case SID_NAME_DOM_GRP:
        case SID_NAME_ALIAS:
        case SID_NAME_WKN_GRP:
                type = ID_TYPE_GID;
                break;
        default:
                type = ID_TYPE_NOT_SPECIFIED;
                break;
        }

        return type;
}


static void wb_sids2xids_done(struct tevent_req *subreq)
{
        struct tevent_req *req = tevent_req_callback_data(
                subreq, struct tevent_req);
        struct wb_sids2xids_state *state = tevent_req_data(
                req, struct wb_sids2xids_state);
        NTSTATUS status, result;

        status = dcerpc_wbint_Sids2UnixIDs_recv(subreq, state, &result);
        TALLOC_FREE(subreq);
        if (any_nt_status_not_ok(status, result, &status)) {
                tevent_req_nterror(req, status);
                return;
        }
        tevent_req_done(req);
}

NTSTATUS wb_sids2xids_recv(struct tevent_req *req,
                           struct unixid xids[], uint32_t num_xids)
{
        struct wb_sids2xids_state *state = tevent_req_data(
                req, struct wb_sids2xids_state);
        NTSTATUS status;
        uint32_t i, num_non_cached;

        if (tevent_req_is_nterror(req, &status)) {
                DEBUG(5, ("wb_sids_to_xids failed: %s\n", nt_errstr(status)));
                return status;
        }

        if (num_xids != state->num_sids) {
                DEBUG(1, ("%s: Have %u xids, caller wants %u\n", __func__,
                          (unsigned)state->num_sids, num_xids));
                return NT_STATUS_INTERNAL_ERROR;
        }

        num_non_cached = 0;

        for (i=0; i<state->num_sids; i++) {
                struct unixid xid;

                xid.id = UINT32_MAX;

                if (state->cached[i].sid != NULL) {
                        xid = state->cached[i].xid;
                } else {
                        xid = state->ids.ids[num_non_cached].xid;

                        idmap_cache_set_sid2unixid(
                                &state->non_cached[num_non_cached],
                                &xid);

                        num_non_cached += 1;
                }

                xids[i] = xid;
        }

        return NT_STATUS_OK;
}