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/*-
* Copyright (c) 2004-2009 Apple Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* $P4: //depot/projects/trustedbsd/openbsm/libbsm/bsm_notify.c#17 $
*/
/*
* Based on sample code from Marc Majka.
*/
#include <sys/types.h>
#include <config/config.h>
#ifdef HAVE_FULL_QUEUE_H
#include <sys/queue.h>
#else /* !HAVE_FULL_QUEUE_H */
#include <compat/queue.h>
#endif /* !HAVE_FULL_QUEUE_H */
#include <bsm/audit_internal.h>
#include <bsm/libbsm.h>
#include <errno.h>
#include <inttypes.h>
#include <stdarg.h>
#include <string.h>
#include <syslog.h>
#ifdef __APPLE__
#include <notify.h>
/* If 1, assumes a kernel that sends the right notification. */
#define AUDIT_NOTIFICATION_ENABLED 1
#if AUDIT_NOTIFICATION_ENABLED
static int token = 0;
#endif /* AUDIT_NOTIFICATION_ENABLED */
static int au_cond = AUC_UNSET; /* <bsm/audit.h> */
uint32_t
au_notify_initialize(void)
{
#if AUDIT_NOTIFICATION_ENABLED
uint32_t status;
int ignore_first;
status = notify_register_check(__BSM_INTERNAL_NOTIFY_KEY, &token);
if (status != NOTIFY_STATUS_OK)
return (status);
status = notify_check(token, &ignore_first);
if (status != NOTIFY_STATUS_OK)
return (status);
#endif
if (audit_get_cond(&au_cond) != 0) {
syslog(LOG_ERR, "Initial audit status check failed (%s)",
strerror(errno));
if (errno == ENOSYS) /* auditon() unimplemented. */
return (AU_UNIMPL);
return (NOTIFY_STATUS_FAILED); /* Is there a better code? */
}
return (NOTIFY_STATUS_OK);
}
int
au_notify_terminate(void)
{
#if AUDIT_NOTIFICATION_ENABLED
return ((notify_cancel(token) == NOTIFY_STATUS_OK) ? 0 : -1);
#else
return (0);
#endif
}
/*
* On error of any notify(3) call, reset 'au_cond' to ensure we re-run
* au_notify_initialize() next time 'round--but assume auditing is on. This
* is a slight performance hit if auditing is off, but at least the system
* will behave correctly. The notification calls are unlikely to fail,
* anyway.
*/
int
au_get_state(void)
{
#if AUDIT_NOTIFICATION_ENABLED
int did_notify;
#endif
int status;
/*
* Don't make the client initialize this set of routines, but take the
* slight performance hit by checking ourselves every time.
*/
if (au_cond == AUC_UNSET) {
status = au_notify_initialize();
if (status != NOTIFY_STATUS_OK) {
if (status == AU_UNIMPL)
return (AU_UNIMPL);
return (AUC_AUDITING);
} else
return (au_cond);
}
#if AUDIT_NOTIFICATION_ENABLED
status = notify_check(token, &did_notify);
if (status != NOTIFY_STATUS_OK) {
au_cond = AUC_UNSET;
return (AUC_AUDITING);
}
if (did_notify == 0)
return (au_cond);
#endif
if (audit_get_cond(&au_cond) != 0) {
/* XXX Reset au_cond to AUC_UNSET? */
syslog(LOG_ERR, "Audit status check failed (%s)",
strerror(errno));
if (errno == ENOSYS) /* Function unimplemented. */
return (AU_UNIMPL);
return (errno);
}
switch (au_cond) {
case AUC_NOAUDIT: /* Auditing suspended. */
case AUC_DISABLED: /* Auditing shut off. */
return (AUC_NOAUDIT);
case AUC_UNSET: /* Uninitialized; shouldn't get here. */
case AUC_AUDITING: /* Audit on. */
default:
return (AUC_AUDITING);
}
}
#endif /* !__APPLE__ */
int
cannot_audit(int val __unused)
{
#ifdef __APPLE__
return (!(au_get_state() == AUC_AUDITING));
#else
int cond;
if (audit_get_cond(&cond) != 0) {
if (errno != ENOSYS) {
syslog(LOG_ERR, "Audit status check failed (%s)",
strerror(errno));
}
return (1);
}
if (cond == AUC_NOAUDIT || cond == AUC_DISABLED)
return (1);
return (0);
#endif /* !__APPLE__ */
}
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