Security-Enhanced Linux secures the chkpwd processes via flexible mandatory access control.
The chkpwd processes execute with the chkpwd_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 chkpwd_t
The chkpwd_t SELinux type can be entered via the chkpwd_exec_t file type.
The default entrypoint paths for the chkpwd_t domain are the following:
/sbin/unix_chkpwd, /sbin/unix_verify, /usr/sbin/validate, /usr/sbin/unix_chkpwd, /usr/sbin/unix_verify
You can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux chkpwd policy is very flexible allowing users to setup their chkpwd processes in as secure a method as possible.
The following process types are defined for chkpwd:
chkpwd_t
Note: semanage permissive -a chkpwd_t can be used to make the process type chkpwd_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 Apache to use mod_auth_pam, you must turn on the httpd_mod_auth_pam boolean. Disabled by default.
setsebool -P httpd_mod_auth_pam 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 nagios/nrpe to call sudo from NRPE utils scripts, you must turn on the nagios_run_sudo boolean. Disabled by default.
setsebool -P nagios_run_sudo 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
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 chkpwd policy is very flexible allowing users to setup their chkpwd processes in as secure a method as possible.
The following file types are defined for chkpwd:
chkpwd_exec_t
- Set files with the chkpwd_exec_t type, if you want to transition an executable to the chkpwd_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 boolean can also be used to manipulate the booleans
system-config-selinux is a GUI tool available to customize SELinux policy settings.