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/*
* Copyright (C) 2016, 2017 "IoT.bzh"
* Author "Fulup Ar Foll"
* Author José Bollo <jose.bollo@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define _GNU_SOURCE
#define AFB_BINDING_PRAGMA_NO_VERBOSE_MACRO
#include <stdlib.h>
#include <afb/afb-auth.h>
#include "afb-auth.h"
#include "afb-context.h"
#include "afb-xreq.h"
#include "afb-cred.h"
#include "verbose.h"
static int check_permission(const char *permission, struct afb_xreq *xreq);
int afb_auth_check(const struct afb_auth *auth, struct afb_xreq *xreq)
{
switch (auth->type) {
default:
case afb_auth_No:
return 0;
case afb_auth_Token:
return afb_context_check(&xreq->context);
case afb_auth_LOA:
return afb_context_check_loa(&xreq->context, auth->loa);
case afb_auth_Permission:
return xreq->cred && auth->text && check_permission(auth->text, xreq);
case afb_auth_Or:
return afb_auth_check(auth->first, xreq) || afb_auth_check(auth->next, xreq);
case afb_auth_And:
return afb_auth_check(auth->first, xreq) && afb_auth_check(auth->next, xreq);
case afb_auth_Not:
return !afb_auth_check(auth->first, xreq);
case afb_auth_Yes:
return 1;
}
}
/*********************************************************************************/
#ifdef BACKEND_PERMISSION_IS_CYNARA
#include <pthread.h>
#include <cynara-client.h>
static cynara *handle;
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
static int check_permission(const char *permission, struct afb_xreq *xreq)
{
int rc;
/* cynara isn't reentrant */
pthread_mutex_lock(&mutex);
/* lazy initialisation */
if (!handle) {
rc = cynara_initialize(&handle, NULL);
if (rc != CYNARA_API_SUCCESS) {
handle = NULL;
ERROR("cynara initialisation failed with code %d", rc);
return 0;
}
}
/* query cynara permission */
rc = cynara_check(handle, xreq->cred->label, afb_context_uuid(&xreq->context), xreq->cred->user, permission);
pthread_mutex_unlock(&mutex);
return rc == CYNARA_API_ACCESS_ALLOWED;
}
/*********************************************************************************/
#else
static int check_permission(const char *permission, struct afb_xreq *xreq)
{
WARNING("Granting permission %s by default of backend", permission);
return 1;
}
#endif
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