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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 writ-
ing 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 util-
ity. 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. This is usually needed after logging
has been suspended.
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.
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
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.
SEE ALSO
auditd.conf(5), audispd(8), ausearch(8), aureport(8), auditctl(8), augenrules(8),
audit.rules(7).
AUTHOR
Steve Grubb
Red Hat Sept 2013 AUDITD(8)
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