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     audit — Security Event Audit


     options AUDIT


     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 FreeBSD audit 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 libbsm(3).

     Audit support is enabled at boot, if present in the kernel, using an rc.conf(5) flag.  The
     audit daemon, auditd(8), is responsible for configuring the kernel to perform audit, pushing
     configuration data from the various audit configuration files into the kernel.

   Audit Special Device
     The kernel audit facility provides a special device, /dev/audit, which is used by auditd(8)
     to monitor for audit 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.

   Audit Pipe Special Devices
     Audit pipe special devices, discussed in 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.

   DTrace Audit Provider
     The DTrace Audit Provider, 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.


     auditreduce(1), praudit(1), audit(2), auditctl(2), auditon(2), getaudit(2), getauid(2),
     poll(2), select(2), setaudit(2), setauid(2), libbsm(3), auditpipe(4), dtaudit(4),
     audit.log(5), audit_class(5), audit_control(5), audit_event(5), audit_user(5),
     audit_warn(5), rc.conf(5), audit(8), auditd(8), auditdistd(8)


     The 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.

     Support for kernel audit first appeared in FreeBSD 6.2.


     This software was created by McAfee Research, the security research division of McAfee,
     Inc., under contract to Apple Computer Inc.  Additional authors include Wayne Salamon,
     Robert Watson, and SPARTA Inc.

     The Basic Security Module (BSM) interface to audit records and audit event stream format
     were defined by Sun Microsystems.

     This manual page was written by Robert Watson <>.


     The FreeBSD 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.

     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.

     Mandatory Access Control (MAC) labels, as provided by the mac(4) facility, are not audited
     as part of records involving MAC decisions.

     Currently the audit syscalls are not supported for jailed processes.  However, if a process
     has audit 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.