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/*
SSSD
Simple access control
Copyright (C) Sumit Bose <sbose@redhat.com> 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 <security/pam_modules.h>
#include "providers/simple/simple_access.h"
#include "util/sss_utf8.h"
#include "providers/dp_backend.h"
#include "db/sysdb.h"
#define CONFDB_SIMPLE_ALLOW_USERS "simple_allow_users"
#define CONFDB_SIMPLE_DENY_USERS "simple_deny_users"
#define CONFDB_SIMPLE_ALLOW_GROUPS "simple_allow_groups"
#define CONFDB_SIMPLE_DENY_GROUPS "simple_deny_groups"
static void simple_access_check(struct tevent_req *req);
void simple_access_handler(struct be_req *be_req)
{
struct be_ctx *be_ctx = be_req_get_be_ctx(be_req);
struct pam_data *pd;
struct tevent_req *req;
struct simple_ctx *ctx;
pd = talloc_get_type(be_req_get_data(be_req), struct pam_data);
pd->pam_status = PAM_SYSTEM_ERR;
if (pd->cmd != SSS_PAM_ACCT_MGMT) {
DEBUG(4, ("simple access does not handles pam task %d.\n", pd->cmd));
pd->pam_status = PAM_MODULE_UNKNOWN;
goto done;
}
ctx = talloc_get_type(be_ctx->bet_info[BET_ACCESS].pvt_bet_data,
struct simple_ctx);
req = simple_access_check_send(be_req, be_ctx->ev, ctx, pd->user);
if (!req) {
pd->pam_status = PAM_SYSTEM_ERR;
goto done;
}
tevent_req_set_callback(req, simple_access_check, be_req);
return;
done:
be_req_terminate(be_req, DP_ERR_OK, pd->pam_status, NULL);
}
static void simple_access_check(struct tevent_req *req)
{
bool access_granted = false;
errno_t ret;
struct pam_data *pd;
struct be_req *be_req;
be_req = tevent_req_callback_data(req, struct be_req);
pd = talloc_get_type(be_req_get_data(be_req), struct pam_data);
ret = simple_access_check_recv(req, &access_granted);
talloc_free(req);
if (ret != EOK) {
pd->pam_status = PAM_SYSTEM_ERR;
goto done;
}
if (access_granted) {
pd->pam_status = PAM_SUCCESS;
} else {
pd->pam_status = PAM_PERM_DENIED;
}
done:
be_req_terminate(be_req, DP_ERR_OK, pd->pam_status, NULL);
}
static errno_t simple_access_parse_names(TALLOC_CTX *mem_ctx,
struct be_ctx *be_ctx,
char **list,
char ***_out)
{
TALLOC_CTX *tmp_ctx = NULL;
char **out = NULL;
char *domain = NULL;
char *name = NULL;
size_t size;
size_t i;
errno_t ret;
if (list == NULL) {
*_out = NULL;
return EOK;
}
tmp_ctx = talloc_new(NULL);
if (tmp_ctx == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_new() failed\n"));
ret = ENOMEM;
goto done;
}
for (size = 0; list[size] != NULL; size++) {
/* count size */
}
out = talloc_zero_array(tmp_ctx, char*, size + 1);
if (out == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_zero_array() failed\n"));
ret = ENOMEM;
goto done;
}
/* Since this is access provider, we should fail on any error so we don't
* allow unauthorized access. */
for (i = 0; i < size; i++) {
ret = sss_parse_name(tmp_ctx, be_ctx->domain->names, list[i],
&domain, &name);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, ("Unable to parse name '%s' [%d]: %s\n",
list[i], ret, sss_strerror(ret)));
goto done;
}
if (domain == NULL || strcasecmp(domain, be_ctx->domain->name) == 0) {
/* This object belongs to main SSSD domain. Those users and groups
* are stored without domain part, so we will strip it off.
* */
out[i] = talloc_move(out, &name);
} else {
/* Subdomain users and groups are stored as fully qualified names,
* thus we will remember the domain part.
*
* Since subdomains may come and go, we will look for their
* existence later, during each access check.
*/
out[i] = talloc_move(out, &list[i]);
}
}
*_out = talloc_steal(mem_ctx, out);
ret = EOK;
done:
talloc_free(tmp_ctx);
return ret;
}
struct bet_ops simple_access_ops = {
.handler = simple_access_handler,
.finalize = NULL
};
int sssm_simple_access_init(struct be_ctx *bectx, struct bet_ops **ops,
void **pvt_data)
{
int ret = EINVAL;
struct simple_ctx *ctx;
int i;
struct {
const char *name;
const char *option;
char **orig_list;
char ***ctx_list;
} lists[] = {{"Allow users", CONFDB_SIMPLE_ALLOW_USERS, NULL, NULL},
{"Deny users", CONFDB_SIMPLE_DENY_USERS, NULL, NULL},
{"Allow groups", CONFDB_SIMPLE_ALLOW_GROUPS, NULL, NULL},
{"Deny groups", CONFDB_SIMPLE_DENY_GROUPS, NULL, NULL},
{NULL, NULL, NULL, NULL}};
ctx = talloc_zero(bectx, struct simple_ctx);
if (ctx == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_zero failed.\n"));
return ENOMEM;
}
ctx->domain = bectx->domain;
ctx->be_ctx = bectx;
lists[0].ctx_list = &ctx->allow_users;
lists[1].ctx_list = &ctx->deny_users;
lists[2].ctx_list = &ctx->allow_groups;
lists[3].ctx_list = &ctx->deny_groups;
for (i = 0; lists[i].name != NULL; i++) {
ret = confdb_get_string_as_list(bectx->cdb, ctx, bectx->conf_path,
lists[i].option, &lists[i].orig_list);
if (ret == ENOENT) {
DEBUG(SSSDBG_FUNC_DATA, ("%s list is empty.\n", lists[i].name));
*lists[i].ctx_list = NULL;
continue;
} else if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, ("confdb_get_string_as_list failed.\n"));
goto failed;
}
ret = simple_access_parse_names(ctx, bectx, lists[i].orig_list,
lists[i].ctx_list);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, ("Unable to parse %s list [%d]: %s\n",
lists[i].name, ret, sss_strerror(ret)));
goto failed;
}
}
if (!ctx->allow_users &&
!ctx->allow_groups &&
!ctx->deny_users &&
!ctx->deny_groups) {
DEBUG(SSSDBG_OP_FAILURE, ("No rules supplied for simple access provider. "
"Access will be granted for all users.\n"));
}
*ops = &simple_access_ops;
*pvt_data = ctx;
return EOK;
failed:
talloc_free(ctx);
return ret;
}
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