Security-Enhanced Linux secures the portmap processes via flexible mandatory access control.
If you want to allow samba to act as a portmapper, you must turn on the samba_portmapper boolean.
setsebool -P samba_portmapper 1
If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd serve for the portmap_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 portmap_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 portmap policy is very flexible allowing users to setup their portmap processes in as secure a method as possible.
The following file types are defined for portmap:
portmap_exec_t
- Set files with the portmap_exec_t type, if you want to transition an executable to the portmap_t domain.
portmap_helper_exec_t
- Set files with the portmap_helper_exec_t type, if you want to transition an executable to the portmap_helper_t domain.
portmap_tmp_t
- Set files with the portmap_tmp_t type, if you want to store portmap temporary files in the /tmp directories.
portmap_var_run_t
- Set files with the portmap_var_run_t type, if you want to store the portmap 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 types associated with a port by using the following command:
semanage port -l
Policy governs the access confined processes have to these ports. SELinux portmap policy is very flexible allowing users to setup their portmap processes in as secure a method as possible.
The following port types are defined for portmap:
Default Defined Ports: tcp 111 udp 111
You can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux portmap policy is very flexible allowing users to setup their portmap processes in as secure a method as possible.
The following process types are defined for portmap:
portmap_helper_t, portmap_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 portmap_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.
portmap_tmp_t
portmap_var_run_t
/var/run/portmap.upgrade-state