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/*
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 "util/debug.h"
#include "winbindd.h"
#include "lib/global_contexts.h"
#include "librpc/gen_ndr/ndr_winbind_c.h"
#include "lib/util/string_wrappers.h"
struct winbindd_pam_logoff_state {
struct wbint_PamLogOff r;
};
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;
char *name_namespace = NULL;
char *name_domain = NULL;
char *user = NULL;
char *logoff_user = NULL;
uid_t caller_uid;
gid_t caller_gid;
int res;
bool ok;
req = tevent_req_create(mem_ctx, &state,
struct winbindd_pam_logoff_state);
if (req == NULL) {
return NULL;
}
D_NOTICE("[%s (%u)] Winbind external command PAM_LOGOFF start.\n"
"Username '%s' is used during logoff.\n",
cli->client_name,
(unsigned int)cli->pid,
request->data.auth.user);
/* 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';
if (request->data.logoff.uid == (uid_t)-1) {
goto failed;
}
logoff_user = request->data.logoff.user;
ok = canonicalize_username(req,
&logoff_user,
&name_namespace,
&name_domain,
&user);
if (!ok) {
goto failed;
}
fstrcpy(request->data.logoff.user, logoff_user);
domain = find_auth_domain(request->flags, name_namespace);
if (domain == NULL) {
goto failed;
}
caller_uid = (uid_t)-1;
res = getpeereid(cli->sock, &caller_uid, &caller_gid);
if (res != 0) {
D_WARNING("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) {
D_WARNING("caller requested invalid uid\n");
goto failed;
}
break;
}
state->r.in.client_name = talloc_strdup(state, request->client_name);
if (tevent_req_nomem(state->r.in.client_name, req)) {
return tevent_req_post(req, ev);
}
state->r.in.client_pid = request->pid;
state->r.in.flags = request->flags;
state->r.in.user = talloc_strdup(state, request->data.logoff.user);
if (tevent_req_nomem(state->r.in.user, req)) {
return tevent_req_post(req, ev);
}
state->r.in.uid = request->data.logoff.uid;
state->r.in.krb5ccname = talloc_strdup(state,
request->data.logoff.krb5ccname);
if (tevent_req_nomem(state->r.in.krb5ccname, req)) {
return tevent_req_post(req, ev);
}
subreq = dcerpc_wbint_PamLogOff_r_send(state,
global_event_context(),
dom_child_handle(domain),
&state->r);
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);
NTSTATUS status;
status = dcerpc_wbint_PamLogOff_r_recv(subreq, state);
TALLOC_FREE(subreq);
if (tevent_req_nterror(req, status)) {
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 = NT_STATUS_OK;
D_NOTICE("Winbind external command PAM_LOGOFF end.\n");
if (tevent_req_is_nterror(req, &status)) {
set_auth_errors(response, status);
return status;
}
response->result = WINBINDD_PENDING;
set_auth_errors(response, state->r.out.result);
if (NT_STATUS_IS_OK(state->r.out.result)) {
winbindd_delete_memory_creds(state->r.in.user);
}
return NT_STATUS(response->data.auth.nt_status);
}
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