Security-Enhanced Linux secures the useradd processes via flexible mandatory access control.
If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd serve for the useradd_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 useradd_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 useradd policy is very flexible allowing users to setup their useradd processes in as secure a method as possible.
The following file types are defined for useradd:
useradd_exec_t
- Set files with the useradd_exec_t type, if you want to transition an executable to the useradd_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.
You can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux useradd policy is very flexible allowing users to setup their useradd processes in as secure a method as possible.
The following process types are defined for useradd:
useradd_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 useradd_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.
default_context_t
/etc/selinux/([^/]*/)?contexts(/.*)?
/root/.default_contexts
etc_t
/etc/.*
/var/db/.*.db
/usr/etc(/.*)?
/var/ftp/etc(/.*)?
/var/lib/stickshift/.limits.d(/.*)?
/var/lib/stickshift/.stickshift-proxy.d(/.*)?
/var/named/chroot/etc(/.*)?
/etc/ipsec.d/examples(/.*)?
/var/spool/postfix/etc(/.*)?
/etc
/etc/localtime
/etc/cups/client.conf
faillog_t
/var/log/btmp.*
/var/run/faillock(/.*)?
/var/log/faillog
/var/log/tallylog
file_context_t
/etc/selinux/([^/]*/)?contexts/files(/.*)?
httpd_user_content_type
httpd_user_script_exec_type
initrc_var_run_t
/var/run/utmp
/var/run/random-seed
/var/run/runlevel.dir
/var/run/setmixer_flag
lastlog_t
/var/log/lastlog
mail_spool_t
/var/mail(/.*)?
/var/spool/imap(/.*)?
/var/spool/mail(/.*)?
passwd_file_t
/etc/group[-+]?
/etc/passwd[-+]?
/etc/ptmptmp
/etc/passwd.OLD
pcscd_var_run_t
/var/run/pcscd(/.*)?
/var/run/pcscd.events(/.*)?
/var/run/pcscd.pid
/var/run/pcscd.pub
/var/run/pcscd.comm
security_t
/selinux
selinux_config_t
/etc/selinux(/.*)?
/etc/selinux/([^/]*/)?seusers
/etc/selinux/([^/]*/)?users(/.*)?
/etc/selinux/([^/]*/)?setrans.conf
selinux_login_config_t
/etc/selinux/([^/]*/)?logins(/.*)?
semanage_read_lock_t