демон аудита Linux (The Linux Audit daemon)
Имя (Name)
auditd - The Linux Audit daemon
Синопсис (Synopsis)
auditd
[-f] [-l] [-n] [-s disable|enable|nochange] [-c <config_dir>]
Описание (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.
Параметры (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/)
Сигналы (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.
Файлы (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.
Примечание (Note)
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.
Смотри также (See also)
auditd.conf(5), auditd-plugins(5), ausearch(8), aureport(8),
auditctl(8), augenrules(8), audit.rules(7).
