bind_selinux(8) - Linux man page

Name

named_selinux - Security Enhanced Linux Policy for the named processes

Description

Security-Enhanced Linux secures the named processes via flexible mandatory access control.

The named processes execute with the named_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 named_t

Entrypoints

The named_t SELinux type can be entered via the "named_checkconf_exec_t,named_exec_t" file types. The default entrypoint paths for the named_t domain are the following:"

/usr/sbin/named-checkconf, /usr/sbin/named, /usr/sbin/lwresd, /usr/sbin/unbound

Process Types

SELinux defines process types (domains) for each process running on the system

You can see the context of a process using the -Z option to ps

Policy governs the access confined processes have to files. SELinux named policy is very flexible allowing users to setup their named processes in as secure a method as possible.

The following process types are defined for named:

named_t, namespace_init_t

Note: semanage permissive -a named_t

can be used to make the process type named_t permissive. Permissive process types are not denied access by SELinux. AVC messages will still be generated.

Booleans

SELinux policy is customizable based on least access required. named policy is extremely flexible and has several booleans that allow you to manipulate the policy and run named with the tightest access possible.

If you want to allow BIND to write the master zone files. Generally this is used for dynamic DNS or zone transfers, you must turn on the named_write_master_zones boolean.

setsebool -P named_write_master_zones 1

If you want to allow BIND to bind apache port, you must turn on the named_bind_http_port boolean.

setsebool -P named_bind_http_port 1

If you want to allow BIND to bind apache port, you must turn on the named_bind_http_port boolean.

setsebool -P named_bind_http_port 1

If you want to allow Git daemon session to bind tcp sockets to all unreserved ports, you must turn on the git_session_bind_all_unreserved_ports boolean.

setsebool -P git_session_bind_all_unreserved_ports 1

If you want to allow system to run with NIS, you must turn on the allow_ypbind boolean.

setsebool -P allow_ypbind 1

If you want to allow Apache to use mod_auth_ntlm_winbind, you must turn on the allow_httpd_mod_auth_ntlm_winbind boolean.

setsebool -P allow_httpd_mod_auth_ntlm_winbind 1

If you want to allow tor daemon to bind tcp sockets to all unreserved ports, you must turn on the tor_bind_all_unreserved_ports boolean.

setsebool -P tor_bind_all_unreserved_ports 1

If you want to allow BIND to write the master zone files. Generally this is used for dynamic DNS or zone transfers, you must turn on the named_write_master_zones boolean.

setsebool -P named_write_master_zones 1

If you want to allow BIND to bind apache port, you must turn on the named_bind_http_port boolean.

setsebool -P named_bind_http_port 1

File Contexts

SELinux requires files to have an extended attribute to define the file type.

You can see the context of a file using the -Z option to ls

Policy governs the access confined processes have to these files. SELinux named policy is very flexible allowing users to setup their named processes in as secure a method as possible.

The following file types are defined for named:

named_cache_t

- Set files with the named_cache_t type, if you want to store the files under the /var/cache directory.

named_checkconf_exec_t

- Set files with the named_checkconf_exec_t type, if you want to transition an executable to the named_checkconf_t domain.

named_conf_t

- Set files with the named_conf_t type, if you want to treat the files as named configuration data, usually stored under the /etc directory.

named_exec_t

- Set files with the named_exec_t type, if you want to transition an executable to the named_t domain.

named_initrc_exec_t

- Set files with the named_initrc_exec_t type, if you want to transition an executable to the named_initrc_t domain.

named_keytab_t

- Set files with the named_keytab_t type, if you want to treat the files as kerberos keytab files.

named_log_t

- Set files with the named_log_t type, if you want to treat the data as named log data, usually stored under the /var/log directory.

named_tmp_t

- Set files with the named_tmp_t type, if you want to store named temporary files in the /tmp directories.

named_var_run_t

- Set files with the named_var_run_t type, if you want to store the named files under the /run directory.

named_zone_t

- Set files with the named_zone_t type, if you want to treat the files as named zone data.

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.

Managed Files

The SELinux process type named_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.

initrc_tmp_t

mnt_t

/mnt(/[^/]*)

/mnt(/[^/]*)?

/rhev(/[^/]*)?

/media(/[^/]*)

/media(/[^/]*)?

/etc/rhgb(/.*)?

/media/.hal-.*

/net

/afs

/misc

/rhev

named_cache_t

/var/named/data(/.*)?

/var/named/slaves(/.*)?

/var/named/dynamic(/.*)?

/var/named/chroot/var/tmp(/.*)?

/var/named/chroot/var/named/data(/.*)?

/var/named/chroot/var/named/slaves(/.*)?

/var/named/chroot/var/named/dynamic(/.*)?

named_log_t

/var/log/named.*

/var/named/chroot/var/log/named.*

named_tmp_t

/var/tmp/DNS_25

named_var_run_t

/var/run/bind(/.*)?

/var/run/named(/.*)?

/var/run/unbound(/.*)?

/var/named/chroot/var/run/named.*

/var/run/ndc

root_t

/

/initrd

tmp_t

/tmp

/usr/tmp

/var/tmp

/var/tmp/vi.recover

Commands

semanage fcontext can also be used to manipulate default file context mappings.

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 boolean can also be used to manipulate the booleans

system-config-selinux is a GUI tool available to customize SELinux policy settings.

Author

This manual page was auto-generated using sepolicy manpage by mgrepl.

See Also

selinux(8), named(8), semanage(8), restorecon(8), chcon(1), sepolicy(8) , setsebool(8), namespace_init_selinux(8)