1 files changed, 93 insertions, 0 deletions
diff --git a/src/afb-perm.c b/src/afb-perm.c
new file mode 100644
index 00000000..e3fab4b6
--- /dev/null
+++ b/src/afb-perm.c
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2017-2019 "IoT.bzh"
+ * 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.
+ */
+
+#include <stdint.h>
+
+#include "afb-context.h"
+#include "afb-cred.h"
+#include "afb-token.h"
+#include "afb-session.h"
+#include "verbose.h"
+
+/*********************************************************************************/
+
+static inline const char *session_of_context(struct afb_context *context)
+{
+	return context->token ? afb_token_string(context->token)
+                : context->session ? afb_session_uuid(context->session)
+                : "";
+}
+
+/*********************************************************************************/
+#ifdef BACKEND_PERMISSION_IS_CYNARA
+
+#include <pthread.h>
+#include <cynara-client.h>
+
+static cynara *handle;
+static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+
+int afb_perm_check(struct afb_context *context, const char *permission)
+{
+	int rc;
+
+	if (!context->credentials) {
+		/* case of permission for self */
+		return 1;
+	}
+	if (!permission) {
+		ERROR("Got a null permission!");
+		return 0;
+	}
+
+	/* 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, context->credentials->label, session_of_context(context), context->credentials->user, permission);
+
+	pthread_mutex_unlock(&mutex);
+	return rc == CYNARA_API_ACCESS_ALLOWED;
+}
+/*********************************************************************************/
+#else
+int afb_perm_check(struct afb_context *context, const char *permission)
+{
+	NOTICE("Granting permission %s by default of backend", permission ?: "(null)");
+	return !!permission;
+}
+#endif
+
+void afb_perm_check_async(
+	struct afb_context *context,
+	const char *permission,
+	void (*callback)(void *closure, int status),
+	void *closure
+)
+{
+	callback(closure, afb_perm_check(context, permission));
+}