iptables_selinux(8) SELinux Policy iptables iptables_selinux(8)NAMEiptables_selinux - Security Enhanced Linux Policy for the iptables pro‐
cesses
DESCRIPTION
Security-Enhanced Linux secures the iptables processes via flexible
mandatory access control.
The iptables processes execute with the iptables_t SELinux type. You
can check if you have these processes running by executing the ps com‐
mand with the -Z qualifier.
For example:
ps -eZ | grep iptables_t
ENTRYPOINTS
The iptables_t SELinux type can be entered via the iptables_exec_t file
type.
The default entrypoint paths for the iptables_t domain are the follow‐
ing:
/sbin/ip6?tables.*, /sbin/ip6?tables-multi.*, /sbin/ip6?tables-
restore.*, /usr/sbin/ip6?tables.*, /usr/sbin/ip6?tables-multi.*,
/usr/sbin/ip6?tables-restore.*, /sbin/ipchains.*, /usr/sbin/ipchains.*,
/sbin/ipset, /sbin/ipvsadm, /sbin/ebtables, /usr/sbin/ipset,
/usr/sbin/ipvsadm, /usr/libexec/ipset, /sbin/ipvsadm-save,
/usr/sbin/ebtables, /sbin/xtables-multi, /sbin/ipvsadm-restore,
/sbin/ebtables-restore, /usr/sbin/ipvsadm-save, /usr/sbin/xtables-
multi, /usr/sbin/ipvsadm-restore, /usr/sbin/ebtables-restore
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
iptables policy is very flexible allowing users to setup their iptables
processes in as secure a method as possible.
The following process types are defined for iptables:
iptables_t
Note: semanage permissive -a iptables_t can be used to make the process
type iptables_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. ipta‐
bles policy is extremely flexible and has several booleans that allow
you to manipulate the policy and run iptables with the tightest access
possible.
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 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 dhcpc client applications to execute iptables com‐
mands, you must turn on the dhcpc_exec_iptables boolean. Disabled by
default.
setsebool -P dhcpc_exec_iptables 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 iptables_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
iptables_t, you must turn on the kerberos_enabled boolean.
setsebool -P kerberos_enabled 1
MANAGED FILES
The SELinux process type iptables_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.
etc_runtime_t
/[^/]+
/etc/mtab.*
/etc/blkid(/.*)?
/etc/nologin.*
/etc/.fstab.hal..+
/halt
/poweroff
/fastboot
/etc/cmtab
/forcefsck
/.autofsck
/.suspended
/fsckoptions
/.autorelabel
/etc/killpower
/etc/securetty
/etc/nohotplug
/etc/ioctl.save
/etc/fstab.REVOKE
/etc/network/ifstate
/etc/sysconfig/hwconf
/etc/ptal/ptal-printd-like
/etc/sysconfig/iptables.save
/etc/xorg.conf.d/00-system-setup-keyboard.conf
/etc/X11/xorg.conf.d/00-system-setup-keyboard.conf
initrc_tmp_t
iptables_tmp_t
iptables_var_run_t
psad_tmp_t
psad_var_log_t
/var/log/psad(/.*)?
shorewall_var_lib_t
/var/lib/shorewall(/.*)?
/var/lib/shorewall6(/.*)?
/var/lib/shorewall-lite(/.*)?
system_conf_t
/etc/yum.repos.d(/.*)?
/etc/sysctl.conf(.old)?
/etc/sysconfig/ip6?tables.*
/etc/sysconfig/ipvsadm.*
/etc/sysconfig/ebtables.*
/etc/sysconfig/system-config-firewall.*
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 iptables policy is very flexible allowing users to setup their
iptables processes in as secure a method as possible.
STANDARD FILE CONTEXT
SELinux defines the file context types for the iptables, 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 iptables_exec_t '/srv/iptables/content(/.*)?'
restorecon -R -v /srv/myiptables_content
Note: SELinux often uses regular expressions to specify labels that
match multiple files.
The following file types are defined for iptables:
iptables_exec_t
- Set files with the iptables_exec_t type, if you want to transition an
executable to the iptables_t domain.
Paths:
/sbin/ip6?tables.*, /sbin/ip6?tables-multi.*, /sbin/ip6?tables-
restore.*, /usr/sbin/ip6?tables.*, /usr/sbin/ip6?tables-multi.*,
/usr/sbin/ip6?tables-restore.*, /sbin/ipchains.*,
/usr/sbin/ipchains.*, /sbin/ipset, /sbin/ipvsadm, /sbin/ebtables,
/usr/sbin/ipset, /usr/sbin/ipvsadm, /usr/libexec/ipset,
/sbin/ipvsadm-save, /usr/sbin/ebtables, /sbin/xtables-multi,
/sbin/ipvsadm-restore, /sbin/ebtables-restore, /usr/sbin/ipvsadm-
save, /usr/sbin/xtables-multi, /usr/sbin/ipvsadm-restore,
/usr/sbin/ebtables-restore
iptables_initrc_exec_t
- Set files with the iptables_initrc_exec_t type, if you want to tran‐
sition an executable to the iptables_initrc_t domain.
Paths:
/etc/rc.d/init.d/ip6?tables, /etc/rc.d/init.d/ebtables
iptables_tmp_t
- Set files with the iptables_tmp_t type, if you want to store iptables
temporary files in the /tmp directories.
iptables_unit_file_t
- Set files with the iptables_unit_file_t type, if you want to treat
the files as iptables unit content.
Paths:
/usr/lib/systemd/system/ppp.*, /usr/lib/systemd/system/ipset.*,
/usr/lib/systemd/system/vsftpd.*, /usr/lib/systemd/sys‐
tem/proftpd.*, /usr/lib/systemd/system/iptables.*, /usr/lib/sys‐
temd/system/ip6tables.*
iptables_var_run_t
- Set files with the iptables_var_run_t type, if you want to store the
iptables files under the /run or /var/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 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), iptables(8), semanage(8), restorecon(8), chcon(1), sepol‐
icy(8) , setsebool(8)iptables 14-05-08 iptables_selinux(8)
