Security-Enhanced Linux secures the l2tpd processes via flexible mandatory access control.
The l2tpd processes execute with the l2tpd_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier.
ps -eZ | grep l2tpd_t
The l2tpd_t SELinux type can be entered via the l2tpd_exec_t file type.
The default entrypoint paths for the l2tpd_t domain are the following:
You can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux l2tpd policy is very flexible allowing users to setup their l2tpd processes in as secure a method as possible.
The following process types are defined for l2tpd:
Note: semanage permissive -a l2tpd_t can be used to make the process type l2tpd_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 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 use nscd shared memory, you must turn on the nscd_use_shm boolean. Enabled by default.
setsebool -P nscd_use_shm 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 l2tpd policy is very flexible allowing users to setup their l2tpd processes in as secure a method as possible.
The following port types are defined for l2tpd:
Default Defined Ports: tcp 1701 udp 1701
The SELinux process type l2tpd_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.
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 l2tpd policy is very flexible allowing users to setup their l2tpd processes in as secure a method as possible.
l2tpd policy stores data with multiple different file context types under the /var/run/.*l2tpd 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/run/.*l2tpd /srv/.*l2tpd
restorecon -R -v /srv/.*l2tpd
STANDARD FILE CONTEXT
SELinux defines the file context types for the l2tpd, 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 l2tpd_var_run_t '/srv/myl2tpd_content(/.*)?'
restorecon -R -v /srv/myl2tpd_content
Note: SELinux often uses regular expressions to specify labels that match multiple files.
The following file types are defined for l2tpd:
- Set files with the l2tpd_exec_t type, if you want to transition an executable to the l2tpd_t domain.
- Set files with the l2tpd_initrc_exec_t type, if you want to transition an executable to the l2tpd_initrc_t domain.
- Set files with the l2tpd_tmp_t type, if you want to store l2tpd temporary files in the /tmp directories.
- Set files with the l2tpd_var_run_t type, if you want to store the l2tpd 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 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.