krb5kdc_selinux(8) SELinux Policy krb5kdc krb5kdc_selinux(8)NAMEkrb5kdc_selinux - Security Enhanced Linux Policy for the krb5kdc pro‐
cesses
DESCRIPTION
Security-Enhanced Linux secures the krb5kdc processes via flexible
mandatory access control.
The krb5kdc processes execute with the krb5kdc_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 krb5kdc_t
ENTRYPOINTS
The krb5kdc_t SELinux type can be entered via the krb5kdc_exec_t file
type.
The default entrypoint paths for the krb5kdc_t domain are the follow‐
ing:
/usr/(kerberos/)?sbin/krb5kdc
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
krb5kdc policy is very flexible allowing users to setup their krb5kdc
processes in as secure a method as possible.
The following process types are defined for krb5kdc:
krb5kdc_t
Note: semanage permissive -a krb5kdc_t can be used to make the process
type krb5kdc_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. krb5kdc
policy is extremely flexible and has several booleans that allow you to
manipulate the policy and run krb5kdc with the tightest access possi‐
ble.
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 system to run with NIS, you must turn on the
nis_enabled boolean. Disabled by default.
setsebool -P nis_enabled 1
MANAGED FILES
The SELinux process type krb5kdc_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.
anon_inodefs_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
krb5kdc_lock_t
/var/kerberos/krb5kdc/principal.*.ok
/var/kerberos/krb5kdc/from_master.*
krb5kdc_log_t
/var/log/krb5kdc.log.*
krb5kdc_principal_t
/etc/krb5kdc/principal.*
/usr/var/krb5kdc/principal.*
/var/kerberos/krb5kdc/principal.*
krb5kdc_tmp_t
krb5kdc_var_run_t
root_t
/
/initrd
security_t
/selinux
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 krb5kdc policy is very flexible allowing users to setup their
krb5kdc processes in as secure a method as possible.
EQUIVALENCE DIRECTORIES
krb5kdc policy stores data with multiple different file context types
under the /var/kerberos/krb5kdc 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/kerberos/krb5kdc /srv/krb5kdc
restorecon -R -v /srv/krb5kdc
STANDARD FILE CONTEXT
SELinux defines the file context types for the krb5kdc, 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 krb5kdc_conf_t '/srv/krb5kdc/content(/.*)?'
restorecon -R -v /srv/mykrb5kdc_content
Note: SELinux often uses regular expressions to specify labels that
match multiple files.
The following file types are defined for krb5kdc:
krb5kdc_conf_t
- Set files with the krb5kdc_conf_t type, if you want to treat the
files as krb5kdc configuration data, usually stored under the /etc
directory.
Paths:
/etc/krb5kdc(/.*)?, /usr/var/krb5kdc(/.*)?, /var/ker‐
beros/krb5kdc(/.*)?
krb5kdc_exec_t
- Set files with the krb5kdc_exec_t type, if you want to transition an
executable to the krb5kdc_t domain.
krb5kdc_lock_t
- Set files with the krb5kdc_lock_t type, if you want to treat the
files as krb5kdc lock data, stored under the /var/lock directory
Paths:
/var/kerberos/krb5kdc/principal.*.ok, /var/ker‐
beros/krb5kdc/from_master.*
krb5kdc_log_t
- Set files with the krb5kdc_log_t type, if you want to treat the data
as krb5kdc log data, usually stored under the /var/log directory.
krb5kdc_principal_t
- Set files with the krb5kdc_principal_t type, if you want to treat the
files as krb5kdc principal data.
Paths:
/etc/krb5kdc/principal.*, /usr/var/krb5kdc/principal.*, /var/ker‐
beros/krb5kdc/principal.*
krb5kdc_tmp_t
- Set files with the krb5kdc_tmp_t type, if you want to store krb5kdc
temporary files in the /tmp directories.
krb5kdc_var_run_t
- Set files with the krb5kdc_var_run_t type, if you want to store the
krb5kdc 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), krb5kdc(8), semanage(8), restorecon(8), chcon(1), sepol‐
icy(8) , setsebool(8)krb5kdc 13-11-20 krb5kdc_selinux(8)
