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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2009, Digium, Inc.
*
* Russell Bryant <russell@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*!
* \file
*
* \author Russell Bryant <russell@digium.com>
*
* \brief Security Event Logging
*
* \todo Make informational security events optional
* \todo Escape quotes in string payload IE contents
*/
/*** MODULEINFO
<support_level>core</support_level>
***/
#include "asterisk.h"
#include "asterisk/module.h"
#include "asterisk/logger.h"
#include "asterisk/threadstorage.h"
#include "asterisk/strings.h"
#include "asterisk/security_events.h"
#include "asterisk/stasis.h"
#include "asterisk/json.h"
static const char LOG_SECURITY_NAME[] = "SECURITY";
static int LOG_SECURITY;
static struct stasis_subscription *security_stasis_sub;
AST_THREADSTORAGE(security_event_buf);
static const size_t SECURITY_EVENT_BUF_INIT_LEN = 256;
enum ie_required {
NOT_REQUIRED,
REQUIRED
};
static void append_json_single(struct ast_str **str, struct ast_json *json,
const enum ast_event_ie_type ie_type, enum ie_required required)
{
const char *ie_type_key = ast_event_get_ie_type_name(ie_type);
struct ast_json *json_string;
json_string = ast_json_object_get(json, ie_type_key);
if (!required && !json_string) {
/* Optional IE isn't present. Ignore. */
return;
}
/* At this point, it _better_ be there! */
ast_assert(json_string != NULL);
ast_str_append(str, 0, ",%s=\"%s\"",
ie_type_key,
ast_json_string_get(json_string));
}
static void append_json(struct ast_str **str, struct ast_json *json,
const struct ast_security_event_ie_type *ies, enum ie_required required)
{
unsigned int i;
for (i = 0; ies[i].ie_type != AST_EVENT_IE_END; i++) {
append_json_single(str, json, ies[i].ie_type, required);
}
}
static void security_event_stasis_cb(struct ast_json *json)
{
struct ast_str *str;
struct ast_json *event_type_json;
enum ast_security_event_type event_type;
event_type_json = ast_json_object_get(json, "SecurityEvent");
event_type = ast_json_integer_get(event_type_json);
ast_assert((unsigned int)event_type < AST_SECURITY_EVENT_NUM_TYPES);
if (!(str = ast_str_thread_get(&security_event_buf,
SECURITY_EVENT_BUF_INIT_LEN))) {
return;
}
ast_str_set(&str, 0, "SecurityEvent=\"%s\"",
ast_security_event_get_name(event_type));
append_json(&str, json,
ast_security_event_get_required_ies(event_type), REQUIRED);
append_json(&str, json,
ast_security_event_get_optional_ies(event_type), NOT_REQUIRED);
ast_log_dynamic_level(LOG_SECURITY, "%s\n", ast_str_buffer(str));
}
static void security_stasis_cb(void *data, struct stasis_subscription *sub,
struct stasis_message *message)
{
struct ast_json_payload *payload = stasis_message_data(message);
if (stasis_message_type(message) != ast_security_event_type()) {
return;
}
if (!payload) {
return;
}
security_event_stasis_cb(payload->json);
}
static int load_module(void)
{
if ((LOG_SECURITY = ast_logger_register_level(LOG_SECURITY_NAME)) == -1) {
return AST_MODULE_LOAD_DECLINE;
}
if (!(security_stasis_sub = stasis_subscribe(ast_security_topic(), security_stasis_cb, NULL))) {
ast_logger_unregister_level(LOG_SECURITY_NAME);
LOG_SECURITY = -1;
return AST_MODULE_LOAD_DECLINE;
}
ast_verb(3, "Security Logging Enabled\n");
return AST_MODULE_LOAD_SUCCESS;
}
static int unload_module(void)
{
if (security_stasis_sub) {
security_stasis_sub = stasis_unsubscribe_and_join(security_stasis_sub);
}
ast_logger_unregister_level(LOG_SECURITY_NAME);
ast_verb(3, "Security Logging Disabled\n");
return 0;
}
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Security Event Logging");
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