auditd - The Linux Audit daemon
] [-s disable|enable|nochange
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
utilities. Configuring the audit
system or loading rules is done with the auditctl
startup, the rules in /etc/audit/audit.rules
are read by
and loaded into the kernel. Alternately, there is also an
program that reads rules located in
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
- leave the audit daemon in the foreground for debugging.
Messages also go to stderr rather than the audit log.
- allow the audit daemon to follow symlinks for config
- no fork. This is useful for running off of inittab or
- 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
- 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.
- caused auditd to discontinue processing audit events, write
a shutdown audit event, and exit.
- 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.
- causes auditd to attempt to resume logging. This is usually
needed after logging has been suspended.
- configuration file for audit daemon
- audit rules to be loaded at startup
- directory holding individual sets of rules to be
compiled into one file by augenrules.
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 audispd 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.