.\" Copyright (c) 2006 Robert N. M. Watson
.\" Copyright (c) 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.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND 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 THE AUTHORS OR 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)
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.\" $FreeBSD: src/share/man/man4/audit.4,v 1.10 2006/12/14 16:40:57 mpp Exp $
.\"
.Dd March 23, 2009 
.Os
.Dt AUDIT 4
.Sh NAME
.Nm audit
.Nd Security Event Audit
.Sh SYNOPSIS
.\" .Cd "options AUDIT"
.Fd #include <bsm/audit.h>
.Fd #include <bsm/audit_internal.h>
.Fd #include <bsm/audit_kevents.h>
.Sh DESCRIPTION
Security Event Audit is a facility to provide fine-grained, configurable
logging of security-relevant events, and is intended to meet the requirements
of the Common Criteria (CC) Common Access Protection Profile (CAPP)
evaluation.
The
.Fx
and Mac OS X
.Nm
facility implements the de facto industry standard BSM API, file
formats, and command line interface, first found in the Solaris operating
system.
Information on the user space implementation can be found in
.Xr libbsm 3 .
.Pp
Audit support is enabled at boot, if present in the kernel, using an
.Xr rc.conf 5
flag or, on Mac OS X, by editing the
.Pa /System/Library/LaunchDaemons/com.apple.auditd.plist 
launchd plist file and removing the disabled key or changing its value
to false.
The audit daemon,
.Xr auditd 8 ,
is responsible for configuring the kernel to perform
.Nm ,
pushing
configuration data from the various audit configuration files into the
kernel.
.Ss Audit Special Device
The 
.Fx
kernel
.Nm
facility provides a special device,
.Pa /dev/audit ,
which is used by
.Xr auditd 8
to monitor for
.Nm
events, such as requests to cycle the log, low disk
space conditions, and requests to terminate auditing.
This device is not intended for use by applications.
Mac OS X provides this same functionality using Mach IPC and 
a host special port.
.Ss Audit Pipe Special Devices
Audit pipe special devices, discussed in
.Xr auditpipe 4 ,
provide a configurable live tracking mechanism to allow applications to
tee the audit trail, as well as to configure custom preselection parameters
to track users and events in a fine-grained manner.
.Sh SEE ALSO
.Xr auditreduce 1 ,
.Xr praudit 1 ,
.Xr audit 2 ,
.Xr auditctl 2 ,
.Xr auditon 2 ,
.Xr getaudit 2 ,
.Xr getauid 2 ,
.Xr poll 2 ,
.Xr select 2 ,
.Xr setaudit 2 ,
.Xr setauid 2 ,
.Xr libbsm 3 ,
.Xr auditpipe 4 ,
.Xr audit_class 5 ,
.Xr audit_control 5 ,
.Xr audit_event 5 ,
.Xr audit.log 5 ,
.Xr audit_user 5 ,
.Xr audit_warn 5 ,
.Xr launchd.plist 5 ,
.Xr rc.conf 5 ,
.Xr audit 8 ,
.Xr auditd 8 
.Sh HISTORY
The
.Tn OpenBSM
implementation was created by McAfee Research, the security
division of McAfee Inc., under contract to Apple Computer Inc.\& in 2004.
It was subsequently adopted by the TrustedBSD Project as the foundation for
the OpenBSM distribution.
.Pp
Support for kernel
.Nm
first appeared in Mac OS X 10.3 and
.Fx 6.2 .
.Sh AUTHORS
.An -nosplit
This software was created by McAfee Research, the security research division
of McAfee, Inc., under contract to Apple Computer Inc.
Additional authors include
.An Wayne Salamon ,
.An Stacey Son ,
.An Robert Watson ,
and SPARTA Inc.
.Pp
The Basic Security Module (BSM) interface to audit records and audit event
stream format were defined by Sun Microsystems.
.Pp
This manual page was written by
.An Robert Watson Aq rwatson@FreeBSD.org .
.Sh BUGS
The
.Nm
facility in
.Fx
is considered experimental, and production deployment should occur only after
careful consideration of the risks of deploying experimental software.
.Pp
The Mac OS X and
.Fx
kernel do not fully validate that audit records submitted by user
applications are syntactically valid BSM; as submission of records is limited
to privileged processes, this is not a critical bug.
.Pp
Instrumentation of auditable events in the kernel is not complete, as some
system calls do not generate audit records, or generate audit records with
incomplete argument information.
.Pp
Mandatory Access Control (MAC) labels, as provided by the
.Xr mac 4
facility, are not audited as part of records involving MAC decisions.