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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 <errno.h>
#include <security/pam_modules.h>
#include "util/util.h"
#include "providers/dp_backend.h"
#include "db/sysdb.h"
#include "providers/simple/simple_access.h"
#define CONFDB_SIMPLE_ALLOW_USERS "simple_allow_users"
#define CONFDB_SIMPLE_DENY_USERS "simple_deny_users"
errno_t simple_access_check(struct simple_ctx *ctx, const char *username,
bool *access_granted)
{
int i;
*access_granted = false;
if (ctx->allow_users != NULL) {
for(i = 0; ctx->allow_users[i] != NULL; i++) {
if (strcmp(username, ctx->allow_users[i]) == 0) {
DEBUG(9, ("User [%s] found in allow list, access granted.\n",
username));
*access_granted = true;
return EOK;
}
}
} else {
*access_granted = true;
if (ctx->deny_users != NULL) {
for(i = 0; ctx->deny_users[i] != NULL; i++) {
if (strcmp(username, ctx->deny_users[i]) == 0) {
DEBUG(9, ("User [%s] found in deny list, access denied.\n",
username));
*access_granted = false;
return EOK;
}
}
}
}
return EOK;
}
void simple_access_handler(struct be_req *be_req)
{
int ret;
bool access_granted = false;
struct pam_data *pd;
struct simple_ctx *ctx;
pd = talloc_get_type(be_req->req_data, 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_req->be_ctx->bet_info[BET_ACCESS].pvt_bet_data,
struct simple_ctx);
ret = simple_access_check(ctx, pd->user, &access_granted);
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->fn(be_req, DP_ERR_OK, pd->pam_status, NULL);
}
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;
ctx = talloc_zero(bectx, struct simple_ctx);
if (ctx == NULL) {
DEBUG(1, ("talloc_zero failed.\n"));
return ENOMEM;
}
ret = confdb_get_string_as_list(bectx->cdb, ctx, bectx->conf_path,
CONFDB_SIMPLE_ALLOW_USERS,
&ctx->allow_users);
if (ret != EOK) {
if (ret == ENOENT) {
DEBUG(9, ("Allow user list is empty.\n"));
ctx->allow_users = NULL;
} else {
DEBUG(1, ("confdb_get_string_as_list failed.\n"));
goto failed;
}
}
ret = confdb_get_string_as_list(bectx->cdb, ctx, bectx->conf_path,
CONFDB_SIMPLE_DENY_USERS,
&ctx->deny_users);
if (ret != EOK) {
if (ret == ENOENT) {
DEBUG(9, ("Deny user list is empty.\n"));
ctx->deny_users = NULL;
} else {
DEBUG(1, ("confdb_get_string_as_list failed.\n"));
goto failed;
}
}
if (ctx->allow_users != NULL && ctx->deny_users != NULL) {
DEBUG(1, ("Access and deny list are defined, only one is allowed.\n"));
ret = EINVAL;
goto failed;
}
*ops = &simple_access_ops;
*pvt_data = ctx;
return EOK;
failed:
talloc_free(ctx);
return ret;
}
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