Security-Enhanced Linux secures the syslogd processes via flexible mandatory access control.
The syslogd processes execute with the syslogd_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier.
For example:
ps -eZ | grep syslogd_t
The syslogd_t SELinux type can be entered via the syslogd_exec_t file type.
The default entrypoint paths for the syslogd_t domain are the following:
/sbin/syslogd, /sbin/minilogd, /sbin/rsyslogd, /sbin/syslog-ng, /usr/sbin/metalog, /usr/sbin/syslogd, /usr/sbin/minilogd, /usr/sbin/rsyslogd, /usr/sbin/syslog-ng, /usr/lib/systemd/systemd-journald, /usr/lib/systemd/systemd-kmsg-syslogd
You can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux syslogd policy is very flexible allowing users to setup their syslogd processes in as secure a method as possible.
The following process types are defined for syslogd:
syslogd_t
Note: semanage permissive -a syslogd_t can be used to make the process type syslogd_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated.
If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd server, you must turn on the authlogin_nsswitch_use_ldap boolean. Disabled by default.
setsebool -P authlogin_nsswitch_use_ldap 1
If you want to allow all domains to execute in fips_mode, you must turn on the fips_mode boolean. Enabled by default.
setsebool -P fips_mode 1
If you want to allow confined applications to run with kerberos, you must turn on the kerberos_enabled boolean. Enabled by default.
setsebool -P kerberos_enabled 1
If you want to allow syslogd daemon to send mail, you must turn on the logging_syslogd_can_sendmail boolean. Disabled by default.
setsebool -P logging_syslogd_can_sendmail 1
If you want to allow syslogd the ability to call nagios plugins. It is turned on by omprog rsyslog plugin, you must turn on the logging_syslogd_run_nagios_plugins boolean. Disabled by default.
setsebool -P logging_syslogd_run_nagios_plugins 1
If you want to allow syslogd the ability to read/write terminals, you must turn on the logging_syslogd_use_tty boolean. Enabled by default.
setsebool -P logging_syslogd_use_tty 1
If you want to allow system to run with NIS, you must turn on the nis_enabled boolean. Disabled by default.
setsebool -P nis_enabled 1
If you want to allow confined applications to use nscd shared memory, you must turn on the nscd_use_shm boolean. Enabled by default.
setsebool -P nscd_use_shm 1
You can see the types associated with a port by using the following command:
semanage port -l
Policy governs the access confined processes have to these ports. SELinux syslogd policy is very flexible allowing users to setup their syslogd processes in as secure a method as possible.
The following port types are defined for syslogd:
Default Defined Ports: tcp 6514,10514 udp 6514,10514
Default Defined Ports: tcp 601,20514 udp 514,601,20514
The SELinux process type syslogd_t can manage files labeled with the following file types. The paths listed are the default paths for these file types. Note the processes UID still need to have DAC permissions.
cert_t
/etc/(letsencrypt|certbot)/(live|archive)(/.*)?
/etc/pki(/.*)?
/etc/ssl(/.*)?
/etc/ipa/nssdb(/.*)?
/etc/httpd/alias(/.*)?
/etc/docker/certs.d(/.*)?
/usr/share/ssl/certs(/.*)?
/var/lib/letsencrypt(/.*)?
/usr/share/ssl/private(/.*)?
/var/named/chroot/etc/pki(/.*)?
/usr/share/ca-certificates(/.*)?
/usr/share/pki/ca-certificates(/.*)?
/usr/share/pki/ca-trust-source(/.*)?
cluster_conf_t
/etc/cluster(/.*)?
cluster_var_lib_t
/var/lib/pcsd(/.*)?
/var/lib/cluster(/.*)?
/var/lib/openais(/.*)?
/var/lib/pengine(/.*)?
/var/lib/corosync(/.*)?
/usr/lib/heartbeat(/.*)?
/var/lib/heartbeat(/.*)?
/var/lib/pacemaker(/.*)?
cluster_var_run_t
/var/run/crm(/.*)?
/var/run/cman_.*
/var/run/rsctmp(/.*)?
/var/run/aisexec.*
/var/run/heartbeat(/.*)?
/var/run/corosync-qnetd(/.*)?
/var/run/corosync-qdevice(/.*)?
/var/run/corosync.pid
/var/run/cpglockd.pid
/var/run/rgmanager.pid
/var/run/cluster/rgmanager.sk
cron_log_t
/var/log/cron.*
/var/log/rpmpkgs.*
innd_log_t
/var/log/news(/.*)?
krb5_host_rcache_t
/var/cache/krb5rcache(/.*)?
/var/tmp/nfs_0
/var/tmp/DNS_25
/var/tmp/host_0
/var/tmp/imap_0
/var/tmp/HTTP_23
/var/tmp/HTTP_48
/var/tmp/ldap_55
/var/tmp/ldap_487
/var/tmp/ldapmap1_0
logfile
all log files
plymouthd_var_log_t
/var/log/boot.log.*
root_t
/sysroot/ostree/deploy/.*-atomic/deploy(/.*)?
/
/initrd
security_t
/selinux
syslogd_tmp_t
syslogd_tmpfs_t
syslogd_var_lib_t
/var/lib/r?syslog(/.*)?
/var/lib/syslog-ng(/.*)?
/var/lib/syslog-ng.persist
/var/lib/misc/syslog-ng.persist-?
syslogd_var_run_t
/var/run/log(/.*)?
/var/run/syslog-ng.ctl
/var/run/syslog-ng(/.*)?
/var/run/systemd/journal(/.*)?
/var/run/metalog.pid
/var/run/syslogd.pid
systemd_coredump_tmpfs_t
var_log_t
/var/log/.*
/nsr/logs(/.*)?
/var/webmin(/.*)?
/var/log/secure[^/]*
/opt/zimbra/log(/.*)?
/var/log/maillog[^/]*
/var/log/spooler[^/]*
/var/log/messages[^/]*
/usr/centreon/log(/.*)?
/var/spool/rsyslog(/.*)?
/var/axfrdns/log/main(/.*)?
/var/spool/bacula/log(/.*)?
/var/tinydns/log/main(/.*)?
/var/dnscache/log/main(/.*)?
/var/stockmaniac/templates_cache(/.*)?
/opt/Symantec/scspagent/IDS/system(/.*)?
/var/log
/var/log/dmesg
/var/log/syslog
/var/named/chroot/var/log
You can see the context of a file using the -Z option to lsP Policy governs the access confined processes have to these files. SELinux syslogd policy is very flexible allowing users to setup their syslogd processes in as secure a method as possible.
EQUIVALENCE DIRECTORIES
syslogd policy stores data with multiple different file context types under the /var/lib/syslog-ng directory. If you would like to store the data in a different directory you can use the semanage command to create an equivalence mapping. If you wanted to store this data under the /srv dirctory you would execute the following command:
semanage fcontext -a -e /var/lib/syslog-ng /srv/syslog-ng
restorecon -R -v /srv/syslog-ng
syslogd policy stores data with multiple different file context types under the /var/run/syslog-ng directory. If you would like to store the data in a different directory you can use the semanage command to create an equivalence mapping. If you wanted to store this data under the /srv dirctory you would execute the following command:
semanage fcontext -a -e /var/run/syslog-ng /srv/syslog-ng
restorecon -R -v /srv/syslog-ng
STANDARD FILE CONTEXT
SELinux defines the file context types for the syslogd, if you wanted to store files with these types in a diffent paths, you need to execute the semanage command to sepecify alternate labeling and then use restorecon to put the labels on disk.
semanage fcontext -a -t syslogd_unit_file_t '/srv/mysyslogd_content(/.*)?'
restorecon -R -v /srv/mysyslogd_content
Note: SELinux often uses regular expressions to specify labels that match multiple files.
The following file types are defined for syslogd:
syslogd_exec_t
- Set files with the syslogd_exec_t type, if you want to transition an executable to the syslogd_t domain.
syslogd_initrc_exec_t
- Set files with the syslogd_initrc_exec_t type, if you want to transition an executable to the syslogd_initrc_t domain.
syslogd_tmp_t
- Set files with the syslogd_tmp_t type, if you want to store syslogd temporary files in the /tmp directories.
syslogd_tmpfs_t
- Set files with the syslogd_tmpfs_t type, if you want to store syslogd files on a tmpfs file system.
syslogd_unit_file_t
- Set files with the syslogd_unit_file_t type, if you want to treat the files as syslogd unit content.
syslogd_var_lib_t
- Set files with the syslogd_var_lib_t type, if you want to store the syslogd files under the /var/lib directory.
syslogd_var_run_t
- Set files with the syslogd_var_run_t type, if you want to store the syslogd files under the /run or /var/run directory.
Note: File context can be temporarily modified with the chcon command. If you want to permanently change the file context you need to use the semanage fcontext command. This will modify the SELinux labeling database. You will need to use restorecon to apply the labels.
semanage permissive can also be used to manipulate whether or not a process type is permissive.
semanage module can also be used to enable/disable/install/remove policy modules.
semanage port can also be used to manipulate the port definitions
semanage boolean can also be used to manipulate the booleans
system-config-selinux is a GUI tool available to customize SELinux policy settings.