useradd_selinux(8) SELinux Policy useradd useradd_selinux(8)NAMEuseradd_selinux - Security Enhanced Linux Policy for the useradd pro‐
cesses
DESCRIPTION
Security-Enhanced Linux secures the useradd processes via flexible
mandatory access control.
The useradd processes execute with the useradd_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 useradd_t
ENTRYPOINTS
The useradd_t SELinux type can be entered via the user_home_t, user‐
add_exec_t file types.
The default entrypoint paths for the useradd_t domain are the follow‐
ing:
/home/[^/]*/.+, /usr/sbin/useradd, /usr/sbin/userdel, /usr/sbin/user‐
mod, /usr/sbin/newusers
PROCESS TYPES
SELinux defines process types (domains) for each process running on the
system
You can see the context of a process using the -Z option to ps
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 useradd_t can be used to make the process
type useradd_t permissive. SELinux does not deny access to permissive
process types, but the AVC (SELinux denials) messages are still gener‐
ated.
BOOLEANS
SELinux policy is customizable based on least access required. useradd
policy is extremely flexible and has several booleans that allow you to
manipulate the policy and run useradd with the tightest access possi‐
ble.
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 authlo‐
gin_nsswitch_use_ldap boolean. Disabled by default.
setsebool -P authlogin_nsswitch_use_ldap 1
If you want to allow all daemons the ability to read/write terminals,
you must turn on the daemons_use_tty boolean. Disabled by default.
setsebool -P daemons_use_tty 1
If you want to deny any process from ptracing or debugging any other
processes, you must turn on the deny_ptrace boolean. Enabled by
default.
setsebool -P deny_ptrace 1
If you want to allow all domains to use other domains file descriptors,
you must turn on the domain_fd_use boolean. Enabled by default.
setsebool -P domain_fd_use 1
If you want to allow all domains to have the kernel load modules, you
must turn on the domain_kernel_load_modules boolean. Disabled by
default.
setsebool -P domain_kernel_load_modules 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 enable reading of urandom for all domains, you must turn
on the global_ssp boolean. Disabled by default.
setsebool -P global_ssp 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. Disabled by default.
setsebool -P nscd_use_shm 1
If you want to allow samba to act as the domain controller, add users,
groups and change passwords, you must turn on the samba_domain_con‐
troller boolean. Disabled by default.
setsebool -P samba_domain_controller 1
If you want to boolean to determine whether the system permits loading
policy, setting enforcing mode, and changing boolean values. Set this
to true and you have to reboot to set it back, you must turn on the
secure_mode_policyload boolean. Enabled by default.
setsebool -P secure_mode_policyload 1
If you want to support NFS home directories, you must turn on the
use_nfs_home_dirs boolean. Disabled by default.
setsebool -P use_nfs_home_dirs 1
If you want to support SAMBA home directories, you must turn on the
use_samba_home_dirs boolean. Disabled by default.
setsebool -P use_samba_home_dirs 1
NSSWITCH DOMAIN
If you want to allow users to resolve user passwd entries directly from
ldap rather then using a sssd server 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
MANAGED FILES
The SELinux process 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.
cifs_t
default_context_t
/etc/selinux/([^/]*/)?contexts(/.*)?
/root/.default_contexts
etc_runtime_t
/[^/]+
/etc/mtab.*
/etc/blkid(/.*)?
/etc/nologin.*
/etc/.fstab.hal..+
/halt
/fastboot
/poweroff
/etc/cmtab
/forcefsck
/.autofsck
/.suspended
/fsckoptions
/.autorelabel
/etc/killpower
/etc/securetty
/etc/nohotplug
/etc/ioctl.save
/etc/fstab.REVOKE
/etc/network/ifstate
/etc/sysconfig/hwconf
/etc/ptal/ptal-printd-like
/etc/sysconfig/iptables.save
/etc/xorg.conf.d/00-system-setup-keyboard.conf
/etc/X11/xorg.conf.d/00-system-setup-keyboard.conf
etc_t
/etc/.*
/var/db/.*.db
/usr/etc(/.*)?
/var/ftp/etc(/.*)?
/var/lib/openshift/.limits.d(/.*)?
/var/lib/openshift/.openshift-proxy.d(/.*)?
/var/lib/openshift/.stickshift-proxy.d(/.*)?
/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/cups/client.conf
faillog_t
/var/log/btmp.*
/var/log/faillog.*
/var/log/tallylog.*
/var/run/faillock(/.*)?
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(/.*)?
nfs_t
openshift_file_type
passwd_file_t
/etc/group[-+]?
/etc/passwd[-+]?
/etc/passwd.adjunct.*
/etc/ptmptmp
/etc/.pwd.lock
/etc/group.lock
/etc/passwd.OLD
/etc/passwd.lock
security_t
/selinux
selinux_config_t
/etc/selinux(/.*)?
/etc/selinux/([^/]*/)?seusers
/etc/selinux/([^/]*/)?users(/.*)?
/etc/selinux/([^/]*/)?setrans.conf
/var/lib/sepolgen(/.*)?
selinux_login_config_t
/etc/selinux/([^/]*/)?logins(/.*)?
semanage_read_lock_t
/etc/selinux/([^/]*/)?modules/semanage.read.LOCK
semanage_store_t
/etc/selinux/([^/]*/)?policy(/.*)?
/etc/selinux/([^/]*/)?modules/(active|tmp|previous)(/.*)?
/etc/share/selinux/mls(/.*)?
/etc/share/selinux/targeted(/.*)?
semanage_tmp_t
semanage_trans_lock_t
/etc/selinux/([^/]*/)?modules/semanage.trans.LOCK
shadow_t
/etc/shadow.*
/etc/gshadow.*
/etc/nshadow.*
/var/db/shadow.*
/etc/security/opasswd
/etc/security/opasswd.old
smsd_var_lib_t
/var/lib/smstools(/.*)?
stapserver_var_lib_t
/var/lib/stap-server(/.*)?
user_home_type
all user home files
useradd_var_run_t
FILE CONTEXTS
SELinux requires files to have an extended attribute to define the file
type.
You can see the context of a file using the -Z option to ls
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.
STANDARD FILE CONTEXT
SELinux defines the file context types for the useradd, 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 useradd_exec_t '/srv/useradd/content(/.*)?'
restorecon -R -v /srv/myuseradd_content
Note: SELinux often uses regular expressions to specify labels that
match multiple files.
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.
Paths:
/usr/sbin/useradd, /usr/sbin/userdel, /usr/sbin/usermod,
/usr/sbin/newusers
useradd_var_run_t
- Set files with the useradd_var_run_t type, if you want to store the
useradd 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 data‐
base. You will need to use restorecon to apply the labels.
COMMANDS
semanage fcontext can also be used to manipulate default file context
mappings.
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 pol‐
icy modules.
semanage boolean can also be used to manipulate the booleans
system-config-selinux is a GUI tool available to customize SELinux pol‐
icy settings.
AUTHOR
This manual page was auto-generated using sepolicy manpage .
SEE ALSOselinux(8), useradd(8), semanage(8), restorecon(8), chcon(1), sepol‐
icy(8) , setsebool(8)useradd 13-11-20 useradd_selinux(8)
