Security-Enhanced Linux secures the krb5kdc processes via flexible mandatory access control.
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 krb5kdc policy is very flexible allowing users to setup their krb5kdc processes in as secure a method as possible.
The following file types are defined for krb5kdc:
krb5kdc_conf_t
- Set files with the krb5kdc_conf_t type, if you want to treat the files as krb5kdc configuration data, usually stored under the /etc directory.
krb5kdc_exec_t
- Set files with the krb5kdc_exec_t type, if you want to transition an executable to the krb5kdc_t domain.
krb5kdc_lock_t
- Set files with the krb5kdc_lock_t type, if you want to treat the files as krb5kdc lock data, stored under the /var/lock directory
krb5kdc_log_t
- Set files with the krb5kdc_log_t type, if you want to treat the data as krb5kdc log data, usually stored under the /var/log directory.
krb5kdc_principal_t
- Set files with the krb5kdc_principal_t type, if you want to treat the files as krb5kdc principal data.
krb5kdc_tmp_t
- Set files with the krb5kdc_tmp_t type, if you want to store krb5kdc temporary files in the /tmp directories.
krb5kdc_var_run_t
- Set files with the krb5kdc_var_run_t type, if you want to store the krb5kdc files under the /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.
You can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux krb5kdc policy is very flexible allowing users to setup their krb5kdc processes in as secure a method as possible.
The following process types are defined for krb5kdc:
krb5kdc_t
Note: semanage permissive -a PROCESS_TYPE can be used to make a process type permissive. Permissive process types are not denied access by SELinux. AVC messages will still be generated.
The SELinux user type krb5kdc_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.
krb5kdc_lock_t
/var/kerberos/krb5kdc/principal.*.ok
/var/kerberos/krb5kdc/from_master.*
krb5kdc_log_t
/var/log/krb5kdc.log.*
krb5kdc_principal_t
/etc/krb5kdc/principal.*
/usr/var/krb5kdc/principal.*
/var/kerberos/krb5kdc/principal.*
krb5kdc_tmp_t
krb5kdc_var_run_t
security_t
/selinux
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.
system-config-selinux is a GUI tool available to customize SELinux policy settings.