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.
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, 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.
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
<
[email protected]>.
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.