freebsd-skq/contrib/openbsm/libbsm/bsm_notify.c
rwatson 3fdf6fa244 Initial vendor import of the TrustedBSD OpenBSM distribution, version
1.0 alpha 1, an implementation of the documented Sun Basic Security
Module (BSM) Audit API and file format, as well as local extensions to
support the Mac OS X and FreeBSD operating systems.  Also included are
command line tools for audit trail reduction and conversion to text,
as well as documentation of the commands, file format, and APIs.  This
distribution is the foundation for the TrustedBSD Audit implementation,
and is a pre-release.

This is the first in a series of commits to introduce support for
Common Criteria CAPP security event audit support.

This software has been made possible through the generous
contributions of Apple Computer, Inc., SPARTA, Inc., as well as
members of the TrustedBSD Project, including Wayne Salamon <wsalamon>
and Tom Rhodes <trhodes>.  The original OpenBSM implementation was
created by McAfee Research under contract to Apple Computer, Inc., as
part of their CC CAPP security evaluation.

Many thanks to:	wsalamon, trhodes
Obtained from:	TrustedBSD Project
2006-01-31 19:40:12 +00:00

150 lines
4.4 KiB
C

/*
* Copyright (c) 2004 Apple Computer, 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 Computer, 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#8 $
*/
#ifdef __APPLE__
/*
* Based on sample code from Marc Majka.
*/
#include <notify.h>
#include <string.h> /* strerror() */
#include <sys/errno.h> /* errno */
#include <bsm/libbsm.h>
#include <stdint.h> /* uint32_t */
#include <syslog.h> /* syslog() */
#include <stdarg.h> /* syslog() */
/* 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 long au_cond = AUC_UNSET; /* <bsm/audit.h> */
uint32_t
au_notify_initialize(void)
{
#if AUDIT_NOTIFICATION_ENABLED
uint32_t status, 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 (auditon(A_GETCOND, &au_cond, sizeof(long)) < 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
uint32_t 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 (auditon(A_GETCOND, &au_cond, sizeof(long)) < 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__ */