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audit_control - audit system parameters

 

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.
 
      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 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.
      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
      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.
 

Sections

Based on BSD UNIX
FreeBSD is an advanced operating system for x86 compatible (including Pentium and Athlon), amd64 compatible (including Opteron, Athlon64, and EM64T), UltraSPARC, IA-64, PC-98 and ARM architectures. It is derived from BSD, the version of UNIX developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.