auditd

AUDITD(8)                System Administration Utilities               AUDITD(8)



NAME
       auditd - The Linux Audit daemon

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

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


AUTHOR
       Steve Grubb



Red Hat                             Sept 2013                          AUDITD(8)