Security-Enhanced Linux secures the ping processes via flexible mandatory access control.
The ping processes execute with the ping_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 ping_t
The ping_t SELinux type can be entered via the ping_exec_t file type.
The default entrypoint paths for the ping_t domain are the following:
/bin/ping.*, /usr/bin/ping.*, /usr/sbin/fping.*, /usr/sbin/hping2, /usr/sbin/send_arp, /usr/lib/heartbeat/send_arp
You can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux ping policy is very flexible allowing users to setup their ping processes in as secure a method as possible.
The following process types are defined for ping:
ping_t, pingd_t
Note: semanage permissive -a ping_t can be used to make the process type ping_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated.
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 authlogin_nsswitch_use_ldap boolean. Disabled by default.
setsebool -P authlogin_nsswitch_use_ldap 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 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. Enabled by default.
setsebool -P nscd_use_shm 1
If you want to allow confined users the ability to execute the ping and traceroute commands, you must turn on the selinuxuser_ping boolean. Enabled by default.
setsebool -P selinuxuser_ping 1
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 ping policy is very flexible allowing users to setup their ping processes in as secure a method as possible.
The following port types are defined for ping:
Default Defined Ports: tcp 9125
You can see the context of a file using the -Z option to lsP Policy governs the access confined processes have to these files. SELinux ping policy is very flexible allowing users to setup their ping processes in as secure a method as possible.
STANDARD FILE CONTEXT
SELinux defines the file context types for the ping, 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 pingd_modules_t '/srv/myping_content(/.*)?'
restorecon -R -v /srv/myping_content
Note: SELinux often uses regular expressions to specify labels that match multiple files.
The following file types are defined for ping:
ping_exec_t
- Set files with the ping_exec_t type, if you want to transition an executable to the ping_t domain.
pingd_etc_t
- Set files with the pingd_etc_t type, if you want to store pingd files in the /etc directories.
pingd_exec_t
- Set files with the pingd_exec_t type, if you want to transition an executable to the pingd_t domain.
pingd_initrc_exec_t
- Set files with the pingd_initrc_exec_t type, if you want to transition an executable to the pingd_initrc_t domain.
pingd_modules_t
- Set files with the pingd_modules_t type, if you want to treat the files as pingd modules.
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.
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 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 policy settings.