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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"
ASTERISK_FILE_VERSION(__FILE__, "$Revision: 398103 $");
#include "asterisk/module.h"
#include "asterisk/logger.h"
#include "asterisk/event.h"
#include "asterisk/threadstorage.h"
#include "asterisk/strings.h"
#include "asterisk/security_events.h"
static const char LOG_SECURITY_NAME[] = "SECURITY";
static int LOG_SECURITY;
static struct ast_event_sub *security_event_sub;
AST_THREADSTORAGE(security_event_buf);
static const size_t SECURITY_EVENT_BUF_INIT_LEN = 256;
enum ie_required {
NOT_REQUIRED,
REQUIRED
};
static int ie_is_present(const struct ast_event *event,
const enum ast_event_ie_type ie_type)
{
return (ast_event_get_ie_raw(event, ie_type) != NULL);
}
static void append_ie(struct ast_str **str, const struct ast_event *event,
const enum ast_event_ie_type ie_type, enum ie_required required)
{
if (!required && !ie_is_present(event, ie_type)) {
/* Optional IE isn't present. Ignore. */
return;
}
/* At this point, it _better_ be there! */
ast_assert(ie_is_present(event, ie_type));
switch (ast_event_get_ie_pltype(ie_type)) {
case AST_EVENT_IE_PLTYPE_UINT:
ast_str_append(str, 0, ",%s=\"%u\"",
ast_event_get_ie_type_name(ie_type),
ast_event_get_ie_uint(event, ie_type));
break;
case AST_EVENT_IE_PLTYPE_STR:
ast_str_append(str, 0, ",%s=\"%s\"",
ast_event_get_ie_type_name(ie_type),
ast_event_get_ie_str(event, ie_type));
break;
case AST_EVENT_IE_PLTYPE_BITFLAGS:
ast_str_append(str, 0, ",%s=\"%u\"",
ast_event_get_ie_type_name(ie_type),
ast_event_get_ie_bitflags(event, ie_type));
break;
case AST_EVENT_IE_PLTYPE_UNKNOWN:
case AST_EVENT_IE_PLTYPE_EXISTS:
case AST_EVENT_IE_PLTYPE_RAW:
ast_log(LOG_WARNING, "Unexpected payload type for IE '%s'\n",
ast_event_get_ie_type_name(ie_type));
break;
}
}
static void append_ies(struct ast_str **str, const struct ast_event *event,
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_ie(str, event, ies[i].ie_type, required);
}
}
static void security_event_cb(const struct ast_event *event, void *data)
{
struct ast_str *str;
enum ast_security_event_type event_type;
if (!(str = ast_str_thread_get(&security_event_buf,
SECURITY_EVENT_BUF_INIT_LEN))) {
return;
}
/* Note that the event type is guaranteed to be valid here. */
event_type = ast_event_get_ie_uint(event, AST_EVENT_IE_SECURITY_EVENT);
ast_assert(event_type >= 0 && event_type < AST_SECURITY_EVENT_NUM_TYPES);
ast_str_set(&str, 0, "%s=\"%s\"",
ast_event_get_ie_type_name(AST_EVENT_IE_SECURITY_EVENT),
ast_security_event_get_name(event_type));
append_ies(&str, event,
ast_security_event_get_required_ies(event_type), REQUIRED);
append_ies(&str, event,
ast_security_event_get_optional_ies(event_type), NOT_REQUIRED);
ast_log_dynamic_level(LOG_SECURITY, "%s\n", ast_str_buffer(str));
}
static int load_module(void)
{
if ((LOG_SECURITY = ast_logger_register_level(LOG_SECURITY_NAME)) == -1) {
return AST_MODULE_LOAD_DECLINE;
}
if (!(security_event_sub = ast_event_subscribe(AST_EVENT_SECURITY,
security_event_cb, "Security Event Logger",
NULL, AST_EVENT_IE_END))) {
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_event_sub) {
security_event_sub = ast_event_unsubscribe(security_event_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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