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AUDIT_CONTROL(5)	    BSD File Formats Manual	      AUDIT_CONTROL(5)

NAME
     audit_control — 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(8) 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.

     host    Specify the hostname or IP address to be used when setting the
	     local systems's audit host information.  This hostname will be
	     converted into an IP or IPv6 address and will be included in the
	     header of each audit record.  Due to the possibility of transient
	     errors coupled with the security issues in the DNS protocol
	     itself, the use of DNS should be avoided.	Instead, it is
	     strongly recommended that the hostname be specified in the
	     /etc/hosts file.  For more information see hosts(5).

     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.  If no value for the minimum free space
	     is set, the default of 20 percent is applied 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.  For convenience, the trail size may
	     be expressed with suffix letters: B (Bytes), K (Kilobytes), M
	     (Megabytes), or G (Gigabytes).  For example, 2M is the same as
	     2097152.

     expire-after
	     Specifies when audit log files will expire and be removed.	 This
	     may be after a time period has passed since the file was last
	     written to or when the aggregate of all the trail files have
	     reached a specified size or a combination of both.	 If no expire-
	     after parameter is given then audit log files will not expire and
	     be removed by the audit control system.  See the information
	     below for the format of the expiration specification.

AUDIT FLAGS
     Audit flags are a comma-delimited list of audit classes as defined in the
     audit_class(5) file.  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.

AUDIT LOG EXPIRATION SPECIFICATION
     The expiration specification can be one value or two values with the log‐
     ical conjunction of AND/OR between them.  Values for the audit log file
     age are numbers with the following suffixes:

	   s	       Log file age in seconds.
	   h	       Log file age in hours.
	   d	       Log file age in days.
	   y	       Log file age in years.

     Values for the disk space used are numbers with the following suffixes:

	   (space) or
	   B	       Disk space used in Bytes.
	   K	       Disk space used in Kilobytes.
	   M	       Disk space used in Megabytes.
	   G	       Disk space used in Gigabytes.

     The suffixes on the values are case sensitive.  If both an age and disk
     space value are used they are seperated by AND or OR and both values are
     used to determine when audit log files expire.  In the case of AND, both
     the age and disk space conditions must be met before the log file is
     removed.  In the case of OR, either condition may expire the log file.
     For example:

	   expire-after: 60d AND 1G

     will expire files that are older than 60 days but only if 1 gigabyte of
     disk space total is being used by the audit logs.

DEFAULT
     The following settings appear in the default audit_control file:

	   dir:/var/audit
	   flags:lo,aa
	   minfree:5
	   naflags:lo,aa
	   policy:cnt,argv
	   filesz:2M
	   expire-after:10M

     The flags parameter above specifies the system-wide mask corresponding to
     login/logout as well as authentication and authorization events.  The
     policy parameter specifies that the system should neither fail stop nor
     suspend processes when the audit store fills and that command line argu‐
     ments should be audited for AUE_EXECVE events.  The trail file will be
     automatically rotated by the audit daemon when the file size reaches
     approximately 2MB.	 Trail files will expire when their aggregate size
     exceeds 10MB.

FILES
     /etc/security/audit_control

SEE ALSO
     auditon(2), audit(4), audit_class(5), audit_event(5), audit_user(5),
     audit(8), auditd(8)

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.

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.

BSD				 May 14, 2009				   BSD
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