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audit_control

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AUDIT_CONTROL(5) FreeBSD File Formats Manual AUDIT_CONTROL(5)

NAME
audit_control -- contains audit system parameters

DESCRIPTION
The audit_control file contains several audit system parameters. Each
line of this file is of the form:

parameter:value

The parameters are:

dir The directory where audit log files are stored. There may be
more than one of these entries. Changes to this entry can only
be enacted by restarting the audit system. See audit(1) for a
description of how to restart the audit system.

flags Specifies which audit event classes are audited for all users.
audit_user(5) describes how to audit events for individual users.
See the information below for the format of the audit flags.

naflags
Contains the audit flags that define what classes of events are
audited when an action cannot be attributed to a specific user.

minfree
The minimum free space required on the file system audit logs are
being written to. When the free space falls below this limit a
warning will be issued. Not currently used as the value of 20
percent is chosen by the kernel.

policy A list of global audit policy flags specifying various behaviors,
such as fail stop, auditing of paths and arguments, etc.

filesz Maximum trail size in bytes; if set to a non-0 value, the audit
daemon will rotate the audit trail file at around this size.
Sizes less than the minimum trail size (default of 512K) will be
rejected as invalid. If 0, trail files will not be automatically
rotated based on file size.

AUDIT FLAGS
Audit flags are a comma-delimited list of audit classes as defined in the
audit_class file. See audit_class(5) for details. Event classes may be
preceded by a prefix which changes their interpretation. The following
prefixes may be used for each class:

(none) Record both successful and failed events
+ Record successful events
- Record failed events
^ Record neither successful nor failed events
^+ Do not record successful events
^- Do not record failed events

AUDIT POLICY FLAGS
The policy flags field is a comma-delimited list of policy flags from the
following list:

cnt Allow processes to continue running even though events
are not being audited. If not set, processes will be
suspended when the audit store space is exhausted. Cur-
rently, this is not a recoverable state.
ahlt Fail stop the system if unable to audit an event--this
consists of first draining pending records to disk, and
then halting the operating system.
argv Audit command line arguments to execve(2).
arge Audit environmental variable arguments to execve(2).
seq Include a unique audit sequence number token in generated
audit records (not implemented on FreeBSD or Darwin).
group Include supplementary groups list in generated audit
records (not implemented on FreeBSD or Darwin; supplemen-
tary groups are never included in records on these sys-
tems).
trail Append a trailer token to each audit record (not imple-
mented on FreeBSD or Darwin; trailers are always included
in records on these systems).
path Include secondary file paths in audit records (not imple-
mented on FreeBSD or Darwin; secondary paths are never
included in records on these systems).
zonename Include a zone ID token with each audit record (not
implemented on FreeBSD or Darwin; FreeBSD audit records
do not currently include the jail ID or name.)
perzone Enable auditing for each local zone (not implemented on
FreeBSD or Darwin; on FreeBSD, audit records are col-
lected from all jails and placed in a single global
trail, and only limited audit controls are permitted
within a jail.)

It is recommended that installations set the cnt flag but not ahlt flag
unless it is intended that audit logs exceeding available disk space halt
the system.

DEFAULT
The following settings appear in the default audit_control file:

dir:/var/audit
flags:lo
minfree:20
naflags:lo
policy:cnt
filesz:0

The flags parameter above specifies the system-wide mask corresponding to
login/logout events. The policy parameter specifies that the system
should neither fail stop nor suspend processes when the audit store
fills. The trail file will not be automatically rotated by the audit
daemon based on file size.

FILES
/etc/security/audit_control

SEE ALSO
audit_class(5), audit_user(5), audit(8), auditd(8)

AUTHORS
This software was created by McAfee Research, the security research divi-
sion 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.

HISTORY
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.

FreeBSD 6.2 January 4, 2006 FreeBSD 6.2

Copyright ©2006 TheBestISP.com

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