sysadm_selinux(8) sysadm SELinux Policy documentation sysadm_selinux(8)NAME
sysadm_u - General system administration role - Security Enhanced Linux
Policy
DESCRIPTION
sysadm_u is an SELinux User defined in the SELinux policy. SELinux
users have default roles, sysadm_r. The default role has a default
type, sysadm_t, associated with it.
The SELinux user will usually login to a system with a context that
looks like:
sysadm_u:sysadm_r:sysadm_t:s0 - s0:c0.c1023
Linux users are automatically assigned an SELinux users at login.
Login programs use the SELinux User to assign initial context to the
user's shell.
SELinux policy uses the context to control the user's access.
By default all users are assigned to the SELinux user via the
__default__ flag
On Targeted policy systems the __default__ user is assigned to the
unconfined_u SELinux user.
You can list all Linux User to SELinux user mapping using:
semanage login -l
If you wanted to change the default user mapping to use the sysadm_u
user, you would execute:
semanage login -m -s sysadm_u __default__
If you want to map the one Linux user (joe) to the SELinux user sysadm,
you would execute:
$ semanage login -a -s sysadm_u joe
USER DESCRIPTION
The SELinux user sysadm_u is an admin user. It means that a mapped
Linux user to this SELinux user is intended for administrative actions.
Usually this is assigned to a root Linux user.
SUDO
The SELinux user sysadm can execute sudo.
You can set up sudo to allow sysadm to transition to an administrative
domain:
Add one or more of the following record to sudoers using visudo.
USERNAME ALL=(ALL) ROLE=auditadm_r TYPE=auditadm_t COMMAND
sudo will run COMMAND as sysadm_u:auditadm_r:auditadm_t:LEVEL
You might also need to add one or more of these new roles to your
SELinux user record.
List the SELinux roles your SELinux user can reach by executing:
$ semanage user -l |grep selinux_name
Modify the roles list and add sysadm_r to this list.
$ semanage user -m-R 'sysadm_r auditadm_r secadm_r staff_r user_r'
sysadm_u
For more details you can see semanage man page.
USERNAME ALL=(ALL) ROLE=secadm_r TYPE=secadm_t COMMAND
sudo will run COMMAND as sysadm_u:secadm_r:secadm_t:LEVEL
You might also need to add one or more of these new roles to your
SELinux user record.
List the SELinux roles your SELinux user can reach by executing:
$ semanage user -l |grep selinux_name
Modify the roles list and add sysadm_r to this list.
$ semanage user -m-R 'sysadm_r auditadm_r secadm_r staff_r user_r'
sysadm_u
For more details you can see semanage man page.
USERNAME ALL=(ALL) ROLE=staff_r TYPE=staff_t COMMAND
sudo will run COMMAND as sysadm_u:staff_r:staff_t:LEVEL
You might also need to add one or more of these new roles to your
SELinux user record.
List the SELinux roles your SELinux user can reach by executing:
$ semanage user -l |grep selinux_name
Modify the roles list and add sysadm_r to this list.
$ semanage user -m-R 'sysadm_r auditadm_r secadm_r staff_r user_r'
sysadm_u
For more details you can see semanage man page.
USERNAME ALL=(ALL) ROLE=user_r TYPE=user_t COMMAND
sudo will run COMMAND as sysadm_u:user_r:user_t:LEVEL
You might also need to add one or more of these new roles to your
SELinux user record.
List the SELinux roles your SELinux user can reach by executing:
$ semanage user -l |grep selinux_name
Modify the roles list and add sysadm_r to this list.
$ semanage user -m-R 'sysadm_r auditadm_r secadm_r staff_r user_r'
sysadm_u
For more details you can see semanage man page.
The SELinux type sysadm_t is not allowed to execute sudo.
X WINDOWS LOGIN
The SELinux user sysadm_u is able to X Windows login.
NETWORK
The SELinux user sysadm_u is able to listen on the following tcp ports.
all ports with out defined types
32768-61000
all ports > 1024
The SELinux user sysadm_u is able to connect to the following tcp
ports.
all ports
5432
53
32768-61000
88,750,4444
9080
111
all ports with out defined types
all ports < 1024
389,636,3268,7389
The SELinux user sysadm_u is able to listen on the following udp ports.
all ports with out defined types
123
32768-61000
The SELinux user sysadm_u is able to connect to the following tcp
ports.
all ports
5432
53
32768-61000
88,750,4444
9080
111
all ports with out defined types
all ports < 1024
389,636,3268,7389
BOOLEANS
SELinux policy is customizable based on least access required. sysadm
policy is extremely flexible and has several booleans that allow you to
manipulate the policy and run sysadm with the tightest access possible.
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 deny user domains applications to map a memory region as
both executable and writable, this is dangerous and the executable
should be reported in bugzilla, you must turn on the deny_execmem bool‐
ean. Enabled by default.
setsebool -P deny_execmem 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 determine whether calling user domains can execute Git
daemon in the git_session_t domain, you must turn on the git_ses‐
sion_users boolean. Enabled by default.
setsebool -P git_session_users 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 logging in and using the system from /dev/console,
you must turn on the login_console_enabled boolean. Enabled by default.
setsebool -P login_console_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 determine whether calling user domains can execute
Polipo daemon in the polipo_session_t domain, you must turn on the
polipo_session_users boolean. Disabled by default.
setsebool -P polipo_session_users 1
If you want to allow database admins to execute DML statement, you must
turn on the postgresql_selinux_unconfined_dbadm boolean. Enabled by
default.
setsebool -P postgresql_selinux_unconfined_dbadm 1
If you want to disallow programs, such as newrole, from transitioning
to administrative user domains, you must turn on the secure_mode bool‐
ean. Enabled by default.
setsebool -P secure_mode 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 allow regular users direct dri device access, you must
turn on the selinuxuser_direct_dri_enabled boolean. Enabled by default.
setsebool -P selinuxuser_direct_dri_enabled 1
If you want to allow unconfined executables to make their stack exe‐
cutable. This should never, ever be necessary. Probably indicates a
badly coded executable, but could indicate an attack. This executable
should be reported in bugzilla, you must turn on the selinuxuser_exec‐
stack boolean. Enabled by default.
setsebool -P selinuxuser_execstack 1
If you want to allow users to connect to the local mysql server, you
must turn on the selinuxuser_mysql_connect_enabled boolean. Disabled by
default.
setsebool -P selinuxuser_mysql_connect_enabled 1
If you want to allow users to connect to PostgreSQL, you must turn on
the selinuxuser_postgresql_connect_enabled boolean. Disabled by
default.
setsebool -P selinuxuser_postgresql_connect_enabled 1
If you want to allow user to r/w files on filesystems that do not have
extended attributes (FAT, CDROM, FLOPPY), you must turn on the selin‐
uxuser_rw_noexattrfile boolean. Disabled by default.
setsebool -P selinuxuser_rw_noexattrfile 1
If you want to allow users to run TCP servers (bind to ports and accept
connection from the same domain and outside users) disabling this
forces FTP passive mode and may change other protocols, you must turn
on the selinuxuser_tcp_server boolean. Disabled by default.
setsebool -P selinuxuser_tcp_server 1
If you want to allow user to use ssh chroot environment, you must turn
on the selinuxuser_use_ssh_chroot boolean. Disabled by default.
setsebool -P selinuxuser_use_ssh_chroot 1
If you want to allow ssh logins as sysadm_r:sysadm_t, you must turn on
the ssh_sysadm_login boolean. Disabled by default.
setsebool -P ssh_sysadm_login 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
If you want to allow the graphical login program to login directly as
sysadm_r:sysadm_t, you must turn on the xdm_sysadm_login boolean. Dis‐
abled by default.
setsebool -P xdm_sysadm_login 1
If you want to allows clients to write to the X server shared memory
segments, you must turn on the xserver_clients_write_xshm boolean. Dis‐
abled by default.
setsebool -P xserver_clients_write_xshm 1
If you want to support X userspace object manager, you must turn on the
xserver_object_manager boolean. Enabled by default.
setsebool -P xserver_object_manager 1
HOME_EXEC
The SELinux user sysadm_u is able execute home content files.
TRANSITIONS
Three things can happen when sysadm_t attempts to execute a program.
1. SELinux Policy can deny sysadm_t from executing the program.
2. SELinux Policy can allow sysadm_t to execute the program in the cur‐
rent user type.
Execute the following to see the types that the SELinux user
sysadm_t can execute without transitioning:
search -A -s sysadm_t -c file -p execute_no_trans
3. SELinux can allow sysadm_t to execute the program and transition to
a new type.
Execute the following to see the types that the SELinux user
sysadm_t can execute and transition:
$ search -A -s sysadm_t -c process -p transition
MANAGED FILES
The SELinux process type sysadm_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.
auditd_etc_t
/etc/audit(/.*)?
auditd_log_t
/var/log/audit(/.*)?
/var/log/audit.log
boolean_type
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
file_context_t
/etc/selinux/([^/]*/)?contexts/files(/.*)?
git_user_content_t
/home/[^/]*/public_git(/.*)?
iceauth_home_t
/root/.DCOP.*
/root/.ICEauthority.*
/home/[^/]*/.DCOP.*
/home/[^/]*/.ICEauthority.*
irc_home_t
/home/[^/]*/.irssi(/.*)?
/home/[^/]*/.ircmotd
krb5_host_rcache_t
/var/cache/krb5rcache(/.*)?
/var/tmp/nfs_0
/var/tmp/DNS_25
/var/tmp/host_0
/var/tmp/imap_0
/var/tmp/HTTP_23
/var/tmp/HTTP_48
/var/tmp/ldap_55
/var/tmp/ldap_487
/var/tmp/ldapmap1_0
krb5_keytab_t
/etc/krb5.keytab
/etc/krb5kdc/kadm5.keytab
/var/kerberos/krb5kdc/kadm5.keytab
non_security_file_type
noxattrfs
all files on file systems which do not support extended attributes
postfix_spool_type
screen_home_t
/root/.screen(/.*)?
/home/[^/]*/.screen(/.*)?
/home/[^/]*/.screenrc
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_store_t
/etc/selinux/([^/]*/)?policy(/.*)?
/etc/selinux/([^/]*/)?modules/(active|tmp|previous)(/.*)?
/etc/share/selinux/mls(/.*)?
/etc/share/selinux/targeted(/.*)?
sysctl_type
systemd_passwd_var_run_t
/var/run/systemd/ask-password(/.*)?
/var/run/systemd/ask-password-block(/.*)?
systemd_unit_file_type
usbfs_t
user_fonts_cache_t
/root/.fontconfig(/.*)?
/root/.fonts/auto(/.*)?
/root/.fonts.cache-.*
/home/[^/]*/.fontconfig(/.*)?
/home/[^/]*/.fonts/auto(/.*)?
/home/[^/]*/.fonts.cache-.*
user_fonts_t
/root/.fonts(/.*)?
/tmp/.font-unix(/.*)?
/home/[^/]*/.fonts(/.*)?
user_home_t
/home/[^/]*/.+
user_home_type
all user home files
user_tmp_type
all user tmp files
user_tmpfs_type
all user content in tmpfs file systems
vmware_conf_t
/home/[^/]*/.vmware[^/]*/.*.cfg
vmware_tmp_t
vmware_tmpfs_t
xauth_home_t
/root/.xauth.*
/root/.Xauth.*
/root/.serverauth.*
/root/.Xauthority.*
/var/lib/pqsql/.xauth.*
/var/lib/pqsql/.Xauthority.*
/var/lib/nxserver/home/.xauth.*
/var/lib/nxserver/home/.Xauthority.*
/home/[^/]*/.xauth.*
/home/[^/]*/.Xauth.*
/home/[^/]*/.serverauth.*
/home/[^/]*/.Xauthority.*
xserver_tmpfs_t
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), sysadm(8), semanage(8), restorecon(8), chcon(1), sepol‐
icy(8) , setsebool(8), sysadm_dbusd_selinux(8),
sysadm_dbusd_selinux(8), sysadm_passwd_selinux(8),
sysadm_passwd_selinux(8), sysadm_screen_selinux(8),
sysadm_screen_selinux(8), sysadm_seunshare_selinux(8), sysadm_seun‐
share_selinux(8), sysadm_ssh_agent_selinux(8),
sysadm_ssh_agent_selinux(8), sysadm_su_selinux(8),
sysadm_su_selinux(8), sysadm_sudo_selinux(8), sysadm_sudo_selinux(8)mgrepl@redhat.com sysadm sysadm_selinux(8)
