.\" Copyright (c) 2006, 2019 Robert N. M. Watson
.\" All rights reserved.
.\"
.\" This software was developed in part by BAE Systems, the University of
.\" Cambridge Computer Laboratory, and Memorial University under DARPA/AFRL
.\" contract FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent
.\" Computing (TC) research program.
.\"
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.Dd April 28, 2019
.Dt AUDIT 4
.Os
.Sh NAME
.Nm audit
.Nd Security Event Audit
.Sh SYNOPSIS
.Cd "options AUDIT"
.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
.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.
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 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.
.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.
.Ss DTrace Audit Provider
The DTrace Audit Provider,
.Xr dtaudit 4 ,
allows D scripts to enable capture of in-kernel audit records for kernel audit
event types, and then process their contents during audit commit or BSM
generation.
.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 dtaudit 4 ,
.Xr audit.log 5 ,
.Xr audit_class 5 ,
.Xr audit_control 5 ,
.Xr audit_event 5 ,
.Xr audit_user 5 ,
.Xr audit_warn 5 ,
.Xr rc.conf 5 ,
.Xr audit 8 ,
.Xr auditd 8 ,
.Xr auditdistd 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
.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 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 Mt rwatson@FreeBSD.org .
.Sh BUGS
The
.Fx
kernel does 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.
.Pp
Currently the
.Nm
syscalls are not supported for jailed processes.
However, if a process has
.Nm
session state associated with it, audit records will still be produced and a zonename token
containing the jail's ID or name will be present in the audit records.