named_selinux(8) SELinux Policy named named_selinux(8)NAMEnamed_selinux - Security Enhanced Linux Policy for the named processes
DESCRIPTION
Security-Enhanced Linux secures the named processes via flexible manda‐
tory 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_exec_t,
named_checkconf_exec_t file types.
The default entrypoint paths for the named_t domain are the following:
/usr/sbin/named, /usr/sbin/lwresd, /usr/sbin/unbound,
/usr/sbin/unbound-anchor, /usr/sbin/unbound-checkconf, /usr/sbin/named-
checkconf
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 pro‐
cesses in as secure a method as possible.
The following process types are defined for named:
named_t
Note: semanage permissive -a named_t can be used to make the process
type named_t permissive. SELinux does not deny access to permissive
process types, but the AVC (SELinux denials) messages are still gener‐
ated.
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 determine whether Bind can bind tcp socket to http
ports, you must turn on the named_tcp_bind_http_port boolean. Disabled
by default.
setsebool -P named_tcp_bind_http_port 1
If you want to determine whether Bind can write to master zone files.
Generally this is used for dynamic DNS or zone transfers, you must turn
on the named_write_master_zones boolean. Disabled by default.
setsebool -P named_write_master_zones 1
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 authlo‐
gin_nsswitch_use_ldap boolean. Disabled by default.
setsebool -P authlogin_nsswitch_use_ldap 1
If you want to allow all daemons to write corefiles to /, you must turn
on the daemons_dump_core boolean. Disabled by default.
setsebool -P daemons_dump_core 1
If you want to enable cluster mode for daemons, you must turn on the
daemons_enable_cluster_mode boolean. Enabled by default.
setsebool -P daemons_enable_cluster_mode 1
If you want to allow all daemons to use tcp wrappers, you must turn on
the daemons_use_tcp_wrapper boolean. Disabled by default.
setsebool -P daemons_use_tcp_wrapper 1
If you want to allow all daemons the ability to read/write terminals,
you must turn on the daemons_use_tty boolean. Disabled by default.
setsebool -P daemons_use_tty 1
If you want to deny any process from ptracing or debugging any other
processes, you must turn on the deny_ptrace boolean. Enabled by
default.
setsebool -P deny_ptrace 1
If you want to allow all domains to use other domains file descriptors,
you must turn on the domain_fd_use boolean. Enabled by default.
setsebool -P domain_fd_use 1
If you want to allow all domains to have the kernel load modules, you
must turn on the domain_kernel_load_modules boolean. Disabled by
default.
setsebool -P domain_kernel_load_modules 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 enable reading of urandom for all domains, you must turn
on the global_ssp boolean. Disabled by default.
setsebool -P global_ssp 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 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. Disabled by default.
setsebool -P nscd_use_shm 1
NSSWITCH DOMAIN
If you want to allow users to resolve user passwd entries directly from
ldap rather then using a sssd server for the named_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
named_t, you must turn on the kerberos_enabled boolean.
setsebool -P kerberos_enabled 1
MANAGED FILES
The SELinux process type named_t can manage files labeled with the fol‐
lowing file types. The paths listed are the default paths for these
file types. Note the processes UID still need to have DAC permissions.
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/cpglockd.pid
/var/run/corosync.pid
/var/run/rgmanager.pid
/var/run/cluster/rgmanager.sk
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
named_cache_t
/var/named/data(/.*)?
/var/lib/unbound(/.*)?
/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
named_var_run_t
/var/run/bind(/.*)?
/var/run/named(/.*)?
/var/run/unbound(/.*)?
/var/named/chroot/var/run/named.*
/var/run/ndc
named_zone_t
/var/named(/.*)?
/var/named/chroot/var/named(/.*)?
root_t
/
/initrd
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.
EQUIVALENCE DIRECTORIES
named policy stores data with multiple different file context types
under the /var/named 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/named /srv/named
restorecon -R -v /srv/named
STANDARD FILE CONTEXT
SELinux defines the file context types for the named, 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 named_cache_t '/srv/named/content(/.*)?'
restorecon -R -v /srv/mynamed_content
Note: SELinux often uses regular expressions to specify labels that
match multiple files.
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.
Paths:
/var/named/data(/.*)?, /var/lib/unbound(/.*)?,
/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_checkconf_exec_t
- Set files with the named_checkconf_exec_t type, if you want to tran‐
sition 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.
Paths:
/etc/rndc.*, /etc/unbound(/.*)?, /var/named/chroot(/.*)?,
/etc/named.rfc1912.zones,
/var/named/chroot/etc/named.rfc1912.zones, /etc/named.conf,
/var/named/named.ca, /etc/named.root.hints,
/var/named/chroot/etc/named.conf, /etc/named.caching-name‐
server.conf, /var/named/chroot/var/named/named.ca,
/var/named/chroot/etc/named.root.hints,
/var/named/chroot/etc/named.caching-nameserver.conf
named_exec_t
- Set files with the named_exec_t type, if you want to transition an
executable to the named_t domain.
Paths:
/usr/sbin/named, /usr/sbin/lwresd, /usr/sbin/unbound,
/usr/sbin/unbound-anchor, /usr/sbin/unbound-checkconf
named_initrc_exec_t
- Set files with the named_initrc_exec_t type, if you want to transi‐
tion an executable to the named_initrc_t domain.
Paths:
/etc/rc.d/init.d/named, /etc/rc.d/init.d/unbound
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.
Paths:
/var/log/named.*, /var/named/chroot/var/log/named.*
named_tmp_t
- Set files with the named_tmp_t type, if you want to store named tem‐
porary files in the /tmp directories.
named_unit_file_t
- Set files with the named_unit_file_t type, if you want to treat the
files as named unit content.
Paths:
/usr/lib/systemd/system/named.*, /usr/lib/systemd/system/unbound.*
named_var_run_t
- Set files with the named_var_run_t type, if you want to store the
named files under the /run or /var/run directory.
Paths:
/var/run/bind(/.*)?, /var/run/named(/.*)?, /var/run/unbound(/.*)?,
/var/named/chroot/var/run/named.*, /var/run/ndc
named_zone_t
- Set files with the named_zone_t type, if you want to treat the files
as named zone data.
Paths:
/var/named(/.*)?, /var/named/chroot/var/named(/.*)?
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 data‐
base. You will need to use restorecon to apply the labels.
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 pol‐
icy modules.
semanage boolean can also be used to manipulate the booleans
system-config-selinux is a GUI tool available to customize SELinux pol‐
icy settings.
AUTHOR
This manual page was auto-generated using sepolicy manpage .
SEE ALSOselinux(8), named(8), semanage(8), restorecon(8), chcon(1), sepolicy(8)
, setsebool(8)named 13-11-20 named_selinux(8)