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

/*
   Unix SMB/CIFS implementation.
   async implementation of WINBINDD_PAM_LOGOFF
   Copyright (C) Volker Lendecke 2010

   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"

struct winbindd_pam_logoff_state {
        struct winbindd_request *request;
        struct winbindd_response *response;
};

static void winbindd_pam_logoff_done(struct tevent_req *subreq);

struct tevent_req *winbindd_pam_logoff_send(TALLOC_CTX *mem_ctx,
                                            struct tevent_context *ev,
                                            struct winbindd_cli_state *cli,
                                            struct winbindd_request *request)
{
        struct tevent_req *req, *subreq;
        struct winbindd_pam_logoff_state *state;
        struct winbindd_domain *domain;
        fstring name_domain, user;
        uid_t caller_uid;
        int res;

        req = tevent_req_create(mem_ctx, &state,
                                struct winbindd_pam_logoff_state);
        if (req == NULL) {
                return NULL;
        }
        state->request = request;

        /* Ensure null termination */
        /* Ensure null termination */
        request->data.logoff.user[sizeof(request->data.logoff.user)-1]='\0';
        request->data.logoff.krb5ccname[
                sizeof(request->data.logoff.krb5ccname)-1]='\0';

        DEBUG(3, ("[%5lu]: pam auth %s\n", (unsigned long)cli->pid,
                  request->data.auth.user));

        if (request->data.logoff.uid == (uid_t)-1) {
                goto failed;
        }

        if (!canonicalize_username(request->data.logoff.user, name_domain,
                                   user)) {
                goto failed;
        }

        domain = find_auth_domain(request->flags, name_domain);
        if (domain == NULL) {
                goto failed;
        }

        caller_uid = (uid_t)-1;

        res = sys_getpeereid(cli->sock, &caller_uid);
        if (res != 0) {
                DEBUG(1,("winbindd_pam_logoff: failed to check peerid: %s\n",
                        strerror(errno)));
                goto failed;
        }

        switch (caller_uid) {
        case -1:
                goto failed;
        case 0:
                /* root must be able to logoff any user - gd */
                break;
        default:
                if (caller_uid != request->data.logoff.uid) {
                        DEBUG(1,("winbindd_pam_logoff: caller requested "
                                 "invalid uid\n"));
                        goto failed;
                }
                break;
        }

        subreq = wb_domain_request_send(state, winbind_event_context(), domain,
                                        request);
        if (tevent_req_nomem(subreq, req)) {
                return tevent_req_post(req, ev);
        }
        tevent_req_set_callback(subreq, winbindd_pam_logoff_done, req);
        return req;

failed:
        tevent_req_nterror(req, NT_STATUS_NO_SUCH_USER);
        return tevent_req_post(req, ev);
}

static void winbindd_pam_logoff_done(struct tevent_req *subreq)
{
        struct tevent_req *req = tevent_req_callback_data(
                subreq, struct tevent_req);
        struct winbindd_pam_logoff_state *state = tevent_req_data(
                req, struct winbindd_pam_logoff_state);
        int res, err;

        res = wb_domain_request_recv(subreq, state, &state->response, &err);
        TALLOC_FREE(subreq);
        if (res == -1) {
                tevent_req_nterror(req, map_nt_error_from_unix(err));
                return;
        }
        tevent_req_done(req);
}

NTSTATUS winbindd_pam_logoff_recv(struct tevent_req *req,
                                  struct winbindd_response *response)
{
        struct winbindd_pam_logoff_state *state = tevent_req_data(
                req, struct winbindd_pam_logoff_state);
        NTSTATUS status;

        if (tevent_req_is_nterror(req, &status)) {
                set_auth_errors(response, status);
                return status;
        }
        *response = *state->response;
        response->result = WINBINDD_PENDING;
        state->response = talloc_move(response, &state->response);

        status = NT_STATUS(response->data.auth.nt_status);
        if (!NT_STATUS_IS_OK(status)) {
                return status;
        }
        winbindd_delete_memory_creds(state->request->data.logoff.user);
        return status;
}