Security-Enhanced Linux secures the traceroute processes via flexible mandatory access control.
The traceroute processes execute with the traceroute_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 traceroute_t
The traceroute_t SELinux type can be entered via the traceroute_exec_t file type.
The default entrypoint paths for the traceroute_t domain are the following:
/bin/tracepath.*, /bin/traceroute.*, /usr/bin/tracepath.*, /usr/bin/traceroute.*, /usr/sbin/traceroute.*, /usr/bin/lft, /usr/bin/mtr, /usr/bin/nmap, /usr/sbin/mtr
You can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux traceroute policy is very flexible allowing users to setup their traceroute processes in as secure a method as possible.
The following process types are defined for traceroute:
traceroute_t
Note: semanage permissive -a traceroute_t can be used to make the process type traceroute_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 traceroute policy is very flexible allowing users to setup their traceroute processes in as secure a method as possible.
The following port types are defined for traceroute:
Default Defined Ports: udp 64000-64010
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 traceroute policy is very flexible allowing users to setup their traceroute processes in as secure a method as possible.
The following file types are defined for traceroute:
traceroute_exec_t
- Set files with the traceroute_exec_t type, if you want to transition an executable to the traceroute_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 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.