Security-Enhanced Linux secures the dhcpc processes via flexible mandatory access control.
If you want to allow dhcpc client applications to execute iptables commands, you must turn on the dhcpc_exec_iptables boolean.
setsebool -P dhcpc_exec_iptables 1
If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd serve for the dhcpc_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 dhcpc_t, you must turn on the kerberos_enabled boolean.
setsebool -P kerberos_enabled 1
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 dhcpc policy is very flexible allowing users to setup their dhcpc processes in as secure a method as possible.
The following file types are defined for dhcpc:
dhcpc_exec_t
- Set files with the dhcpc_exec_t type, if you want to transition an executable to the dhcpc_t domain.
dhcpc_helper_exec_t
- Set files with the dhcpc_helper_exec_t type, if you want to transition an executable to the dhcpc_helper_t domain.
dhcpc_state_t
- Set files with the dhcpc_state_t type, if you want to treat the files as dhcpc state data.
dhcpc_tmp_t
- Set files with the dhcpc_tmp_t type, if you want to store dhcpc temporary files in the /tmp directories.
dhcpc_var_run_t
- Set files with the dhcpc_var_run_t type, if you want to store the dhcpc files under the /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.
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 dhcpc policy is very flexible allowing users to setup their dhcpc processes in as secure a method as possible.
The following port types are defined for dhcpc:
Default Defined Ports: tcp 68,546 udp 68,546
You can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux dhcpc policy is very flexible allowing users to setup their dhcpc processes in as secure a method as possible.
The following process types are defined for dhcpc:
dhcpc_t
Note: semanage permissive -a PROCESS_TYPE can be used to make a process type permissive. Permissive process types are not denied access by SELinux. AVC messages will still be generated.
The SELinux user type dhcpc_t can manage files labeled with