Security-Enhanced Linux secures the fenced processes via flexible mandatory access control.
If you want to allow fenced domain to execute ssh, you must turn on the fenced_can_ssh boolean.
setsebool -P fenced_can_ssh 1
If you want to allow fenced domain to connect to the network using TCP, you must turn on the fenced_can_network_connect boolean.
setsebool -P fenced_can_network_connect 1
If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd serve for the fenced_t, you must turn on the authlogin_nsswitch_use_ldap boolean.
setsebool -P authlogin_nsswitch_use_ldap 1
If you want to allow confined applications to run with kerberos for the fenced_t, you must turn on the kerberos_enabled boolean.
setsebool -P kerberos_enabled 1
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 fenced policy is very flexible allowing users to setup their fenced processes in as secure a method as possible.
The following file types are defined for fenced:
fenced_exec_t
- Set files with the fenced_exec_t type, if you want to transition an executable to the fenced_t domain.
fenced_lock_t
- Set files with the fenced_lock_t type, if you want to treat the files as fenced lock data, stored under the /var/lock directory
fenced_tmp_t
- Set files with the fenced_tmp_t type, if you want to store fenced temporary files in the /tmp directories.
fenced_tmpfs_t
- Set files with the fenced_tmpfs_t type, if you want to store fenced files on a tmpfs file system.
fenced_var_log_t
- Set files with the fenced_var_log_t type, if you want to treat the data as fenced var log data, usually stored under the /var/log directory.
fenced_var_run_t
- Set files with the fenced_var_run_t type, if you want to store the fenced 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 fenced policy is very flexible allowing users to setup their fenced processes in as secure a method as possible.
The following process types are defined for fenced:
fenced_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 fenced_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.
cluster_var_lib_t
/var/lib/cluster(/.*)?
fenced_lock_t
/var/lock/fence_manual.lock
fenced_tmp_t