source: vendor/3.6.9/source3/winbindd/wb_sid2uid.c

/*
   Unix SMB/CIFS implementation.
   async sid2uid
   Copyright (C) Volker Lendecke 2009

   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 "librpc/gen_ndr/ndr_wbint_c.h"
#include "idmap_cache.h"
#include "../libcli/security/security.h"

struct wb_sid2uid_state {
        struct tevent_context *ev;
        struct dom_sid sid;
        char *dom_name;
        uint64 uid64;
        uid_t uid;
};

static void wb_sid2uid_lookup_done(struct tevent_req *subreq);
static void wb_sid2uid_done(struct tevent_req *subreq);

struct tevent_req *wb_sid2uid_send(TALLOC_CTX *mem_ctx,
                                   struct tevent_context *ev,
                                   const struct dom_sid *sid)
{
        struct tevent_req *req, *subreq;
        struct wb_sid2uid_state *state;
        bool expired;

        req = tevent_req_create(mem_ctx, &state, struct wb_sid2uid_state);
        if (req == NULL) {
                return NULL;
        }
        sid_copy(&state->sid, sid);
        state->ev = ev;

        if (winbindd_use_idmap_cache()
            && idmap_cache_find_sid2uid(sid, &state->uid, &expired)) {

                DEBUG(10, ("idmap_cache_find_sid2uid found %d%s\n",
                           (int)state->uid, expired ? " (expired)": ""));

                if (!expired || is_domain_offline(find_our_domain())) {
                        if (state->uid == -1) {
                                tevent_req_nterror(req, NT_STATUS_NONE_MAPPED);
                        } else {
                                tevent_req_done(req);
                        }
                        return tevent_req_post(req, ev);
                }
        }

        /*
         * We need to make sure the sid is of the right type to not flood
         * idmap with wrong entries
         */

        subreq = wb_lookupsid_send(state, ev, &state->sid);
        if (tevent_req_nomem(subreq, req)) {
                return tevent_req_post(req, ev);
        }
        tevent_req_set_callback(subreq, wb_sid2uid_lookup_done, req);
        return req;
}

static void wb_sid2uid_lookup_done(struct tevent_req *subreq)
{
        struct tevent_req *req = tevent_req_callback_data(
                subreq, struct tevent_req);
        struct wb_sid2uid_state *state = tevent_req_data(
                req, struct wb_sid2uid_state);
        struct winbindd_domain *domain;
        const char *domname;
        const char *name;
        enum lsa_SidType type;
        NTSTATUS status;
        struct winbindd_child *child;

        status = wb_lookupsid_recv(subreq, talloc_tos(), &type, &domname,
                                   &name);
        if (tevent_req_nterror(req, status)) {
                return;
        }

        if ((type != SID_NAME_USER) && (type != SID_NAME_COMPUTER)) {
                DEBUG(5, ("Sid %s is not a user or a computer.\n",
                          sid_string_dbg(&state->sid)));
                /*
                 * We have to set the cache ourselves here, the child
                 * which is normally responsible was not queried yet.
                 */
                idmap_cache_set_sid2uid(&state->sid, -1);
                tevent_req_nterror(req, NT_STATUS_INVALID_SID);
                return;
        }

        domain = find_domain_from_sid_noinit(&state->sid);

        /*
         * TODO: Issue a gettrustinfo here in case we don't have "domain" yet?
         */

        if ((domain != NULL) && domain->have_idmap_config) {
                state->dom_name = domain->name;
        } else {
                state->dom_name = NULL;
        }

        child = idmap_child();

        subreq = dcerpc_wbint_Sid2Uid_send(state, state->ev, child->binding_handle,
                                           state->dom_name, &state->sid,
                                           &state->uid64);
        if (tevent_req_nomem(subreq, req)) {
                return;
        }
        tevent_req_set_callback(subreq, wb_sid2uid_done, req);
}

static void wb_sid2uid_done(struct tevent_req *subreq)
{
        struct tevent_req *req = tevent_req_callback_data(
                subreq, struct tevent_req);
        struct wb_sid2uid_state *state = tevent_req_data(
                req, struct wb_sid2uid_state);
        NTSTATUS status, result;

        status = dcerpc_wbint_Sid2Uid_recv(subreq, state, &result);
        TALLOC_FREE(subreq);
        if (any_nt_status_not_ok(status, result, &status)) {
                tevent_req_nterror(req, status);
                return;
        }

        state->uid = state->uid64;
        tevent_req_done(req);
}

NTSTATUS wb_sid2uid_recv(struct tevent_req *req, uid_t *uid)
{
        struct wb_sid2uid_state *state = tevent_req_data(
                req, struct wb_sid2uid_state);
        NTSTATUS status;

        if (tevent_req_is_nterror(req, &status)) {
                return status;
        }
        *uid = state->uid;
        return NT_STATUS_OK;
}