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4.2. Which Log File is Used
In Red Hat Enterprise Linux, the dbus and audit packages are installed by default, unless they are removed from the default package selection. The setroubleshoot-server must be installed using Yum (use the
yum install setroubleshoot-server command).
If the
auditd daemon is running, an SELinux denial message, such as the following, is written to /var/log/audit/audit.log by default:
type=AVC msg=audit(1223024155.684:49): avc: denied { getattr } for pid=2000 comm="httpd" path="/var/www/html/file1" dev=dm-0 ino=399185 scontext=unconfined_u:system_r:httpd_t:s0 tcontext=system_u:object_r:samba_share_t:s0 tclass=file
In addition, a message similar to the one below is written to the
/var/log/message file:
May 7 18:55:56 localhost setroubleshoot: SELinux is preventing httpd (httpd_t) "getattr" to /var/www/html/file1 (samba_share_t). For complete SELinux messages. run sealert -l de7e30d6-5488-466d-a606-92c9f40d316d
In Red Hat Enterprise Linux 7,
setroubleshootd no longer constantly runs as a service. However, it is still used to analyze the AVC messages. Two new programs act as a method to start setroubleshoot when needed:
- The
sedispatchutility runs as a part of theauditsubsystem. When an AVC denial message is returned,sedispatchsends a message usingdbus. These messages go straight tosetroubleshootdif it is already running. If it is not running,sedispatchstarts it automatically. - The
seappletutility runs in the system toolbar, waiting for dbus messages insetroubleshootd. It launches the notification bubble, allowing the user to review AVC messages.
Procedure 4.1. Starting Daemons Automatically
- To configure the
auditdandrsyslogdaemons to automatically start at boot, enter the following commands as the root user:~]#systemctl enable auditd.service~]#systemctl enable rsyslog.service - To ensure that the daemons are enabled, type the following commands at the shell prompt:
~]$systemctl is-enabled auditdenabled~]$systemctl is-enabled rsyslogenabledAlternatively, use thesystemctl status service-name.servicecommand and search for the keywordenabledin the command output, for example:~]$systemctl status auditd.service | grep enabledauditd.service - Security Auditing Service Loaded: loaded (/usr/lib/systemd/system/auditd.service; enabled)
To learn more on how the
systemd daemon manages system services, see the Managing System Services chapter in the System Administrator's Guide.
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