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NAME

     auditon — configure system audit parameters

SYNOPSIS

     #include <bsm/audit.h>

     int
     auditon(int cmd, void *data, u_int length);

DESCRIPTION

     The auditon() system call is used to manipulate various audit control operations.  The data
     argument should point to a structure whose type depends on the command.  The length argument
     specifies the size of *data in bytes.  The cmd argument may be any of the following:

     A_SETPOLICY      Set audit policy flags.  The data argument must point to a int value set to
                      one or more the following audit policy control values bitwise OR'ed
                      together: AUDIT_CNT, AUDIT_AHLT, AUDIT_ARGV, and AUDIT_ARGE.  If AUDIT_CNT
                      is set, the system will continue even if it becomes low on space and
                      discontinue logging events until the low space condition is remedied.  If
                      it is not set, audited events will block until the low space condition is
                      remedied.  Unaudited events, however, are unaffected.  If AUDIT_AHLT is
                      set, a panic(9) if it cannot write an event to the global audit log file.
                      If AUDIT_ARGV is set, then the argument list passed to the execve(2) system
                      call will be audited.  If AUDIT_ARGE is set, then the environment variables
                      passed to the execve(2) system call will be audited.  The default policy is
                      none of the audit policy control flags set.

     A_SETKAUDIT      Set the host information.  The data argument must point to a
                      auditinfo_addr_t structure containing the host IP address information.
                      After setting, audit records that are created as a result of kernel events
                      will contain this information.

     A_SETKMASK       Set the kernel preselection masks (success and failure).  The data argument
                      must point to a au_mask_t structure containing the mask values as defined
                      in <bsm/audit.h>.  These masks are used for non-attributable audit event
                      preselection.  The field am_success specifies which classes of successful
                      audit events are to be logged to the audit trail. The field am_failure
                      specifies which classes of failed audit events are to be logged. The value
                      of both fields is the bitwise OR'ing of the audit event classes specified
                      in bsm/audit.h.  The various audit classes are described more fully in
                      audit_class(5).

     A_SETQCTRL       Set kernel audit queue parameters.  The data argument must point to a
                      au_qctrl_t structure (defined in <bsm/audit.h>) containing the kernel audit
                      queue control settings: aq_hiwater, aq_lowater, aq_bufsz, aq_delay, and
                      aq_minfree.  The field aq_hiwater defines the maximum number of audit
                      record entries in the queue used to store the audit records ready for
                      delivery to disk.  New records are inserted at the tail of the queue and
                      removed from the head.  For new records which would exceed the high water
                      mark, the calling thread is inserted into the wait queue, waiting for the
                      audit queue to have enough space available as defined with the field
                      aq_lowater.  The field aq_bufsz defines the maximum length of the audit
                      record that can be supplied with audit(2).  The field aq_delay is unused.
                      The field aq_minfree specifies the minimum amount of free blocks on the
                      disk device used to store audit records.  If the value of free blocks falls
                      below the configured minimum amount, the kernel informs the audit daemon
                      about low disk space.  The value is to be specified in percent of free file
                      system blocks.  A value of 0 results in a disabling of the check.  The
                      default and maximum values (default/maximum) for the audit queue control
                      parameters are:

                            aq_hiwater    100/10000 (audit records)
                            aq_lowater    10/aq_hiwater (audit records)
                            aq_bufsz      32767/1048576 (bytes)
                            aq_delay      (Not currently used.)

     A_SETSTAT        Return ENOSYS.  (Not implemented.)

     A_SETUMASK       Return ENOSYS.  (Not implemented.)

     A_SETSMASK       Return ENOSYS.  (Not implemented.)

     A_SETCOND        Set the current auditing condition.  The data argument must point to a int
                      value containing the new audit condition, one of AUC_AUDITING, AUC_NOAUDIT,
                      or AUC_DISABLED.  If AUC_NOAUDIT is set, then auditing is temporarily
                      suspended. If AUC_AUDITING is set, auditing is resumed. If AUC_DISABLED is
                      set, the auditing system will shutdown, draining all audit records and
                      closing out the audit trail file.

     A_SETCLASS       Set the event class preselection mask for an audit event.  The data
                      argument must point to a au_evclass_map_t structure containing the audit
                      event and mask.  The field ec_number is the audit event and ec_class is the
                      audit class mask. See audit_event(5) for more information on audit event to
                      class mapping.

     A_SETPMASK       Set the preselection masks for a process.  The data argument must point to
                      a auditpinfo_t structure that contains the given process's audit
                      preselection masks for both success and failure.  The field ap_pid is the
                      process id of the target process.  The field ap_mask must point to a
                      au_mask_t structure which holds the preselection masks as described in the
                      section above.

     A_SETFSIZE       Set the maximum size of the audit log file.  The data argument must point
                      to a au_fstat_t structure with the af_filesz field set to the maximum audit
                      log file size.  A value of 0 indicates no limit to the size.

     A_GETCLASS       Return the event to class mapping for the designated audit event.  The data
                      argument must point to a au_evclass_map_t structure. See the A_SETCLASS
                      section above for more information.

     A_GETKAUDIT      Get the current host information.  The data argument must point to a
                      auditinfo_addr_t structure.

     A_GETPINFO       Return the audit settings for a process.  The data argument must point to a
                      auditpinfo_t structure which will be set to contain ap_auid (the audit ID),
                      ap_mask (the preselection mask), ap_termid (the terminal ID), and ap_asid
                      (the audit session ID) of the given target process.  The process ID of the
                      target process is passed into the kernel using the ap_pid field.  See the
                      section A_SETPMASK above and getaudit(2) for more information.

     A_GETPINFO_ADDR  Return the extended audit settings for a process.  The data argument must
                      point to a auditpinfo_addr_t structure which is similar to the
                      auditpinfo_addr_t structure described above.  The exception is the
                      ap_termid (the terminal ID) field which points to a au_tid_addr_t structure
                      can hold much a larger terminal address and an address type.  The process
                      ID of the target process is passed into the kernel using the ap_pid field.
                      See the section A_SETPMASK above and getaudit(2) for more information.

     A_GETSINFO_ADDR  Return the extended audit settings for a session.  The data argument must
                      point to a auditinfo_addr_t structure.  The audit session ID of the target
                      session is passed into the kernel using the ai_asid field.  See
                      getaudit_addr(2) for more information about the auditinfo_addr_t structure.

     A_GETKMASK       Return the current kernel preselection masks.  The data argument must point
                      to a au_mask_t structure which will be set to the current kernel
                      preselection masks for non-attributable events.

     A_GETPOLICY      Return the current audit policy setting.  The data argument must point to a
                      int value which will be set to one of the current audit policy flags.  The
                      audit policy flags are described in the A_SETPOLICY section above.

     A_GETQCTRL       Return the current kernel audit queue control parameters.  The data
                      argument must point to a au_qctrl_t structure which will be set to the
                      current kernel audit queue control parameters.  See the A_SETQCTL section
                      above for more information.

     A_GETFSIZE       Returns the maximum size of the audit log file.  The data argument must
                      point to a au_fstat_t structure.  The af_filesz field will be set to the
                      maximum audit log file size.  A value of 0 indicates no limit to the size.
                      The af_currsz field will be set to the current audit log file size.

     A_GETCWD         Return ENOSYS.  (Not implemented.)

     A_GETCAR         Return ENOSYS.  (Not implemented.)

     A_GETSTAT        Return ENOSYS.  (Not implemented.)

     A_GETCOND        Return the current auditing condition.  The data argument must point to a
                      int value which will be set to the current audit condition, one of
                      AUC_AUDITING, AUC_NOAUDIT or AUC_DISABLED.  See the A_SETCOND section above
                      for more information.

     A_SENDTRIGGER    Send a trigger to the audit daemon.  The data argument must point to a int
                      value set to one of the acceptable trigger values: AUDIT_TRIGGER_LOW_SPACE
                      (low disk space where the audit log resides), AUDIT_TRIGGER_OPEN_NEW (open
                      a new audit log file), AUDIT_TRIGGER_READ_FILE (read the audit_control
                      file), AUDIT_TRIGGER_CLOSE_AND_DIE (close the current log file and exit),
                      AUDIT_TRIGGER_NO_SPACE (no disk space left for audit log file).
                      AUDIT_TRIGGER_ROTATE_USER (request audit log file rotation).
                      AUDIT_TRIGGER_INITIALIZE (initialize audit subsystem for Mac OS X only).
                      or AUDIT_TRIGGER_EXPIRE_TRAILS (request audit log file expiration).

RETURN VALUES

     Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and
     the global variable errno is set to indicate the error.

ERRORS

     The auditon() function will fail if:

     [ENOSYS]           Returned by options not yet implemented.

     [EFAULT]           A failure occurred while data transferred to or from the kernel failed.

     [EINVAL]           Illegal argument was passed by a system call.

     [EPERM]            The process does not have sufficient permission to complete the
                        operation.

     The A_SENDTRIGGER command is specific to the FreeBSD and Mac OS X implementations, and is
     not present in Solaris.

SEE ALSO

     audit(2), auditctl(2), getaudit(2), getaudit_addr(2), getauid(2), setaudit(2),
     setaudit_addr(2), setauid(2), libbsm(3)

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 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 Tom Rhodes <trhodes@FreeBSD.org>, Robert Watson
     <rwatson@FreeBSD.org>, and Wayne Salamon <wsalamon@FreeBSD.org>.