cobblerd_selinux(8) SELinux Policy cobblerd cobblerd_selinux(8)NAMEcobblerd_selinux - Security Enhanced Linux Policy for the cobblerd pro‐
cesses
DESCRIPTION
Security-Enhanced Linux secures the cobblerd processes via flexible
mandatory access control.
The cobblerd processes execute with the cobblerd_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 cobblerd_t
ENTRYPOINTS
The cobblerd_t SELinux type can be entered via the cobblerd_exec_t file
type.
The default entrypoint paths for the cobblerd_t domain are the follow‐
ing:
/usr/bin/cobblerd
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
cobblerd policy is very flexible allowing users to setup their cobblerd
processes in as secure a method as possible.
The following process types are defined for cobblerd:
cobblerd_t
Note: semanage permissive -a cobblerd_t can be used to make the process
type cobblerd_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. cob‐
blerd policy is extremely flexible and has several booleans that allow
you to manipulate the policy and run cobblerd with the tightest access
possible.
If you want to determine whether Cobbler can connect to the network
using TCP, you must turn on the cobbler_can_network_connect boolean.
Disabled by default.
setsebool -P cobbler_can_network_connect 1
If you want to determine whether Cobbler can access cifs file systems,
you must turn on the cobbler_use_cifs boolean. Disabled by default.
setsebool -P cobbler_use_cifs 1
If you want to determine whether Cobbler can access nfs file systems,
you must turn on the cobbler_use_nfs boolean. Disabled by default.
setsebool -P cobbler_use_nfs 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 cobblerd_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
cobblerd_t, you must turn on the kerberos_enabled boolean.
setsebool -P kerberos_enabled 1
PORT TYPES
SELinux defines port types to represent TCP and UDP ports.
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 cobblerd policy is very flexible allowing users to setup their
cobblerd processes in as secure a method as possible.
The following port types are defined for cobblerd:
cobbler_port_t
Default Defined Ports:
tcp 25151
MANAGED FILES
The SELinux process type cobblerd_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.
cifs_t
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
cobbler_tmp_t
cobbler_var_lib_t
/var/lib/cobbler(/.*)?
/var/www/cobbler(/.*)?
/var/cache/cobbler(/.*)?
/var/lib/tftpboot/etc(/.*)?
/var/lib/tftpboot/ppc(/.*)?
/var/lib/tftpboot/grub(/.*)?
/var/lib/tftpboot/s390x(/.*)?
/var/lib/tftpboot/images(/.*)?
/var/lib/tftpboot/pxelinux.cfg(/.*)?
/var/lib/tftpboot/yaboot
/var/lib/tftpboot/memdisk
/var/lib/tftpboot/menu.c32
/var/lib/tftpboot/pxelinux.0
dhcp_etc_t
/etc/dhcpc.*
/etc/dhcp3?(/.*)?
/etc/dhcpd(6)?.conf
/etc/dhcp3?/dhclient.*
/etc/dhclient.*conf
/etc/dhcp/dhcpd(6)?.conf
/etc/dhclient-script
dnsmasq_etc_t
/etc/dnsmasq.d(/.*)?
/etc/dnsmasq.conf
named_conf_t
/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-nameserver.conf
/var/named/chroot/var/named/named.ca
/var/named/chroot/etc/named.root.hints
/var/named/chroot/etc/named.caching-nameserver.conf
named_zone_t
/var/named(/.*)?
/var/named/chroot/var/named(/.*)?
net_conf_t
/etc/hosts[^/]*
/etc/yp.conf.*
/etc/denyhosts.*
/etc/hosts.deny.*
/etc/resolv.conf.*
/etc/sysconfig/networking(/.*)?
/etc/sysconfig/network-scripts(/.*)?
/etc/sysconfig/network-scripts/.*resolv.conf
/etc/ethers
/etc/ntp.conf
nfs_t
public_content_rw_t
/var/spool/abrt-upload(/.*)?
root_t
/
/initrd
rsync_etc_t
/etc/rsyncd.conf
tftpd_etc_t
/etc/xinetd.d/tftp
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 cobblerd policy is very flexible allowing users to setup their
cobblerd processes in as secure a method as possible.
STANDARD FILE CONTEXT
SELinux defines the file context types for the cobblerd, 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 cobblerd_exec_t '/srv/cobblerd/content(/.*)?'
restorecon -R -v /srv/mycobblerd_content
Note: SELinux often uses regular expressions to specify labels that
match multiple files.
The following file types are defined for cobblerd:
cobblerd_exec_t
- Set files with the cobblerd_exec_t type, if you want to transition an
executable to the cobblerd_t domain.
cobblerd_initrc_exec_t
- Set files with the cobblerd_initrc_exec_t type, if you want to tran‐
sition an executable to the cobblerd_initrc_t domain.
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.
SHARING FILES
If you want to share files with multiple domains (Apache, FTP, rsync,
Samba), you can set a file context of public_content_t and public_con‐
tent_rw_t. These context allow any of the above domains to read the
content. If you want a particular domain to write to the public_con‐
tent_rw_t domain, you must set the appropriate boolean.
Allow cobblerd servers to read the /var/cobblerd directory by adding
the public_content_t file type to the directory and by restoring the
file type.
semanage fcontext -a -t public_content_t "/var/cobblerd(/.*)?"
restorecon -F -R -v /var/cobblerd
Allow cobblerd servers to read and write /var/cobblerd/incoming by
adding the public_content_rw_t type to the directory and by restoring
the file type. You also need to turn on the cobblerd_anon_write bool‐
ean.
semanage fcontext -a -t public_content_rw_t "/var/cobblerd/incom‐
ing(/.*)?"
restorecon -F -R -v /var/cobblerd/incoming
setsebool -P cobblerd_anon_write 1
If you want to determine whether Cobbler can modify public files used
for public file transfer services., you must turn on the cob‐
bler_anon_write boolean.
setsebool -P cobbler_anon_write 1
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 port can also be used to manipulate the port definitions
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), cobblerd(8), semanage(8), restorecon(8), chcon(1), sepol‐
icy(8) , setsebool(8)cobblerd 13-11-20 cobblerd_selinux(8)
