auditd(8) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | SIGNALS | FILES | NOTES | SEE ALSO | AUTHOR | COLOPHON

AUDITD(8)            System Administration Utilities           AUDITD(8)

NAME         top

       auditd - The Linux Audit daemon

SYNOPSIS         top

       auditd
       [-f] [-l] [-n] [-s disable|enable|nochange] [-c <config_dir>]

DESCRIPTION         top

       auditd is the userspace component to the Linux Auditing System.
       It's responsible for writing audit records to the disk. Viewing
       the logs is done with the ausearch or aureport utilities.
       Configuring the audit system or loading rules is done with the
       auditctl utility. During startup, the rules in
       /etc/audit/audit.rules are read by auditctl and loaded into the
       kernel. Alternately, there is also an augenrules program that
       reads rules located in /etc/audit/rules.d/ and compiles them into
       an audit.rules file. The audit daemon itself has some
       configuration options that the admin may wish to customize. They
       are found in the auditd.conf file.

OPTIONS         top

       -f     leave the audit daemon in the foreground for debugging.
              Messages also go to stderr rather than the audit log.

       -l     allow the audit daemon to follow symlinks for config
              files.

       -n     no fork. This is useful for running off of inittab or
              systemd.

       -s=ENABLE_STATE
              specify when starting if auditd should change the current
              value for the kernel enabled flag. Valid values for
              ENABLE_STATE are "disable", "enable" or "nochange". The
              default is to enable (and disable when auditd terminates).
              The value of the enabled flag may be changed during the
              lifetime of auditd using 'auditctl -e'.

       -c     Specify alternate config file directory. Note that this
              same directory will be passed to the dispatcher. (default:
              /etc/audit/)

SIGNALS         top

       SIGHUP causes auditd to reconfigure. This means that auditd re-
              reads the configuration file. If there are no syntax
              errors, it will proceed to implement the requested
              changes. If the reconfigure is successful, a DAEMON_CONFIG
              event is recorded in the logs. If not successful, error
              handling is controlled by space_left_action,
              admin_space_left_action, disk_full_action, and
              disk_error_action parameters in auditd.conf.

       SIGTERM
              caused auditd to discontinue processing audit events,
              write a shutdown audit event, and exit.

       SIGUSR1
              causes auditd to immediately rotate the logs. It will
              consult the max_log_file_action to see if it should keep
              the logs or not.

       SIGUSR2
              causes auditd to attempt to resume logging and passing
              events to plugins. This is usually needed after logging
              has been suspended or the internal queue is overflowed.
              Either of these conditions depends on the applicable
              configuration settings.

       SIGCONT
              causes auditd to dump a report of internal state to
              /var/run/auditd.state.

FILES         top

       /etc/audit/auditd.conf - configuration file for audit daemon

       /etc/audit/audit.rules - audit rules to be loaded at startup

       /etc/audit/rules.d/ - directory holding individual sets of rules
       to be compiled into one file by augenrules.

       /etc/audit/plugins.d/ - directory holding individual plugin
       configuration files.

       /var/run/auditd.state - report about internal state.

NOTES         top

       A boot param of audit=1 should be added to ensure that all
       processes that run before the audit daemon starts is marked as
       auditable by the kernel. Not doing that will make a few processes
       impossible to properly audit.

       The audit daemon can receive audit events from other audit
       daemons via the audisp-remote plugin. The audit daemon may be
       linked with tcp_wrappers to control which machines can connect.
       If this is the case, you can add an entry to hosts.allow and
       deny.

SEE ALSO         top

       auditd.conf(5), auditd-plugins(5), ausearch(8), aureport(8),
       auditctl(8), augenrules(8), audit.rules(7).

AUTHOR         top

       Steve Grubb

COLOPHON         top

       This page is part of the audit (Linux Audit) project.
       Information about the project can be found at 
       ⟨http://people.redhat.com/sgrubb/audit/⟩.  If you have a bug
       report for this manual page, send it to linux-audit@redhat.com.
       This page was obtained from the project's upstream Git repository
       ⟨https://github.com/linux-audit/audit-userspace.git⟩ on
       2021-04-01.  (At that time, the date of the most recent commit
       that was found in the repository was 2021-03-29.)  If you
       discover any rendering problems in this HTML version of the page,
       or you believe there is a better or more up-to-date source for
       the page, or you have corrections or improvements to the
       information in this COLOPHON (which is not part of the original
       manual page), send a mail to man-pages@man7.org

Red Hat                         Sept 2013                      AUDITD(8)

Pages that refer to this page: audit_request_status(3)audit_set_backlog_limit(3)audit_set_backlog_wait_time(3)audit_set_enabled(3)audit_set_failure(3)audit_set_pid(3)audit_set_rate_limit(3)get_auditfail_action(3)set_aumessage_mode(3)auditd.conf(5)auditd-plugins(5)zos-remote.conf(5)audit.rules(7)audispd-zos-remote(8)auditctl(8)augenrules(8)aureport(8)ausearch(8)pam_loginuid(8)systemd-update-utmp.service(8)