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
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.
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=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 user_r staff_r secadm_r auditadm_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 user_r staff_r secadm_r auditadm_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 user_r staff_r secadm_r auditadm_r' sysadm_u
For more details you can see semanage man page.
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 user_r staff_r secadm_r auditadm_r' sysadm_u
For more details you can see semanage man page.
The SELinux type sysadm_t is not allowed to execute sudo.
The SELinux user sysadm_u is able to X Windows login.
all ports with out defined types
32768-60999
389,636,3268,3269,7389
all ports > 1024
all ports
5432,9898
8955
53,853
389,636,3268,3269,7389
32768-60999
all ports with out defined types
111
9080
all ports < 1024
88,750,4444
all ports with out defined types
32768-60999
123
all ports > 1024
all ports
5432,9898
8955
53,853
389,636,3268,3269,7389
32768-60999
all ports with out defined types
111
9080
all ports < 1024
88,750,4444
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 determine whether crond can execute jobs in the user domain as opposed to the the generic cronjob domain, you must turn on the cron_userdomain_transition boolean. Enabled by default.
setsebool -P cron_userdomain_transition 1
If you want to deny all system processes and Linux users to use bluetooth wireless technology, you must turn on the deny_bluetooth boolean. Disabled by default.
setsebool -P deny_bluetooth 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 boolean. Disabled 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. Disabled by default.
setsebool -P deny_ptrace 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_session_users boolean. Disabled by default.
setsebool -P git_session_users 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. Enabled 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 unconfined executables to make their stack executable. 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_execstack 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 selinuxuser_rw_noexattrfile boolean. Enabled 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 users to run UDP servers (bind to ports and accept connection from the same domain and outside users) disabling this may break avahi discovering services on the network and other udp related services, you must turn on the selinuxuser_udp_server boolean. Disabled by default.
setsebool -P selinuxuser_udp_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 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
The SELinux user sysadm_u is able execute home content files.
Three things can happen when sysadm_t attempts to execute a program.
1. SELinux Policy can deny sysadm_t from executing the program.
Execute the following to see the types that the SELinux user sysadm_t can execute without transitioning:
sesearch -A -s sysadm_t -c file -p execute_no_trans
Execute the following to see the types that the SELinux user sysadm_t can execute and transition:
$ sesearch -A -s sysadm_t -c process -p transition
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.
adjtime_t
/etc/adjtime
admin_home_t
/root(/.*)?
anon_inodefs_t
auditd_etc_t
/etc/audit(/.*)?
auditd_log_t
/var/log/audit(/.*)?
/var/log/audit.log.*
auth_cache_t
/var/cache/coolkey(/.*)?
boolean_type
cgroup_t
/sys/fs/cgroup
chrome_sandbox_tmpfs_t
cifs_t
default_context_t
/etc/selinux/([^/]*/)?contexts(/.*)?
/root/.default_contexts
dirsrv_config_t
/etc/dirsrv(/.*)?
dirsrv_var_lib_t
/var/lib/dirsrv(/.*)?
dirsrv_var_log_t
/var/log/dirsrv(/.*)?
dirsrv_var_run_t
/var/run/slapd.*
/var/run/dirsrv(/.*)?
dosfs_t
etc_aliases_t
/etc/mail/.*.db
/etc/mail/aliases.*
/etc/postfix/aliases.*
/etc/aliases
/etc/aliases.db
etc_runtime_t
/[^/]+
/etc/mtab.*
/etc/blkid(/.*)?
/etc/nologin.*
/etc/.fstab.hal..+
/halt
/fastboot
/poweroff
/.autofsck
/etc/cmtab
/forcefsck
/.suspended
/fsckoptions
/.autorelabel
/etc/.updated
/var/.updated
/etc/killpower
/etc/nohotplug
/etc/securetty
/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(/.*)?
gconf_tmp_t
/tmp/gconfd-[^/]+/.*
git_user_content_t
/home/[^/]+/public_git(/.*)?
gkeyringd_tmp_t
/var/run/user/[^/]*/keyring.*
gnome_home_type
hwloc_var_run_t
/var/run/hwloc(/.*)?
iceauth_home_t
/root/.DCOP.*
/root/.ICEauthority.*
/home/[^/]+/.DCOP.*
/home/[^/]+/.ICEauthority.*
irc_home_t
/home/[^/]+/.irssi(/.*)?
/home/[^/]+/irclog(/.*)?
/home/[^/]+/.ircmotd
irc_tmp_t
irssi_home_t
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
mail_spool_t
/var/mail(/.*)?
/var/spool/imap(/.*)?
/var/spool/mail(/.*)?
/var/spool/smtpd(/.*)?
mpd_user_data_t
mqueue_spool_t
/var/spool/(client)?mqueue(/.*)?
/var/spool/mqueue.in(/.*)?
nfs_t
non_security_file_type
noxattrfs
all files on file systems which do not support extended attributes
ntp_drift_t
/var/lib/ntp(/.*)?
/etc/ntp/data(/.*)?
/var/lib/sntp(/.*)?
/var/lib/sntp-kod(/.*)?
ntpd_key_t
/etc/ntp/crypto(/.*)?
/etc/ntp/keys
ntpd_log_t
/var/log/ntp.*
/var/log/xntpd.*
/var/log/ntpstats(/.*)?
ntpd_tmp_t
ntpd_unit_file_t
/usr/lib/systemd/system/ntpd.*
ntpd_var_run_t
/var/run/ntpd.pid
policy_src_t
/usr/lib/selinux(/.*)?
postfix_data_t
/var/lib/postfix.*
postfix_etc_t
/etc/postfix.*
postfix_map_tmp_t
postfix_prng_t
/etc/postfix/prng_exch
postfix_public_t
/var/spool/postfix/public(/.*)?
postfix_spool_type
postfix_var_run_t
/var/spool/postfix/pid/.*
postgresql_db_t
/var/lib/pgsql(/.*)?
/var/lib/sepgsql(/.*)?
/var/lib/postgres(ql)?(/.*)?
/usr/share/jonas/pgsql(/.*)?
/usr/lib/pgsql/test/regress(/.*)?
postgresql_etc_t
/etc/postgresql(/.*)?
/etc/sysconfig/pgsql(/.*)?
postgresql_log_t
/var/lib/pgsql/.*.log
/var/log/rhdb/rhdb(/.*)?
/var/log/postgresql(/.*)?
/var/log/postgres.log.*
/var/lib/pgsql/logfile(/.*)?
/var/lib/pgsql/data/log(/.*)?
/var/log/sepostgresql.log.*
/var/lib/pgsql/data/pg_log(/.*)?
/var/lib/sepgsql/pgstartup.log
postgresql_tmp_t
postgresql_var_run_t
/var/run/postgresql(/.*)?
screen_home_t
/root/.screen(/.*)?
/home/[^/]+/.screen(/.*)?
/home/[^/]+/.screenrc
/home/[^/]+/.tmux.conf
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_store_t
/etc/selinux/([^/]*/)?policy(/.*)?
/etc/selinux/(minimum|mls|targeted)/active(/.*)?
/etc/selinux/([^/]*/)?modules/(active|tmp|previous)(/.*)?
/var/lib/selinux(/.*)?
/etc/share/selinux/mls(/.*)?
/etc/share/selinux/targeted(/.*)?
slapd_cert_t
/etc/openldap/certs(/.*)?
slapd_db_t
/var/lib/ldap(/.*)?
/etc/openldap/slapd.d(/.*)?
/var/lib/openldap-data(/.*)?
/var/lib/openldap-ldbm(/.*)?
/var/lib/openldap-slurpd(/.*)?
slapd_etc_t
/etc/ldap/slapd.conf
slapd_keytab_t
slapd_lock_t
/var/lock/subsys/ldap
/var/lock/subsys/slapd
slapd_replog_t
/var/lib/ldap/replog(/.*)?
slapd_tmp_t
slapd_unit_file_t
/usr/lib/systemd/system/slapd.*
slapd_var_run_t
/var/run/openldap(/.*)?
/var/run/ldapi
/var/run/slapd.pid
/var/run/slapd.args
ssh_home_t
/var/lib/[^/]+/.ssh(/.*)?
/root/.ssh(/.*)?
/var/lib/one/.ssh(/.*)?
/var/lib/pgsql/.ssh(/.*)?
/var/lib/openshift/[^/]+/.ssh(/.*)?
/var/lib/amanda/.ssh(/.*)?
/var/lib/stickshift/[^/]+/.ssh(/.*)?
/var/lib/gitolite/.ssh(/.*)?
/var/lib/nocpulse/.ssh(/.*)?
/var/lib/gitolite3/.ssh(/.*)?
/var/lib/openshift/gear/[^/]+/.ssh(/.*)?
/root/.shosts
/home/[^/]+/.ssh(/.*)?
/home/[^/]+/.ansible/cp/.*
/home/[^/]+/.shosts
sysctl_type
systemd_passwd_var_run_t
/var/run/systemd/ask-password(/.*)?
/var/run/systemd/ask-password-block(/.*)?
systemd_unit_file_type
tracefs_t
usbfs_t
user_fonts_cache_t
/root/.fontconfig(/.*)?
/root/.fonts/auto(/.*)?
/root/.fonts.cache-.*
/home/[^/]+/.fontconfig(/.*)?
/home/[^/]+/.fonts/auto(/.*)?
/home/[^/]+/.fonts.cache-.*
user_fonts_config_t
/root/.fonts.d(/.*)?
/root/.fonts.conf
/home/[^/]+/.fonts.d(/.*)?
/home/[^/]+/.fonts.conf
user_fonts_t
/root/.fonts(/.*)?
/tmp/.font-unix(/.*)?
/home/[^/]+/.fonts(/.*)?
/home/[^/]+/.local/share/fonts(/.*)?
user_home_t
/home/[^/]+/.+
user_home_type
all user home files
user_tmp_t
/dev/shm/mono.*
/var/run/user(/.*)?
/tmp/.ICE-unix(/.*)?
/tmp/.X11-unix(/.*)?
/dev/shm/pulse-shm.*
/tmp/.X0-lock
/tmp/hsperfdata_root
/var/tmp/hsperfdata_root
/home/[^/]+/tmp
/home/[^/]+/.tmp
/tmp/gconfd-[^/]+
user_tmp_type
all user tmp files
vmware_conf_t
/home/[^/]+/.vmware[^/]*/.*.cfg
vmware_file_t
/home/[^/]+/vmware(/.*)?
/home/[^/]+/.vmware(/.*)?
vmware_tmp_t
vmware_tmpfs_t
wireshark_home_t
/home/[^/]+/.wireshark(/.*)?
wireshark_tmp_t
wireshark_tmpfs_t
xauth_home_t
/root/.Xauth.*
/root/.xauth.*
/root/.Xauthority.*
/root/.serverauth.*
/var/lib/pqsql/.xauth.*
/var/lib/pqsql/.Xauthority.*
/var/lib/nxserver/home/.xauth.*
/var/lib/nxserver/home/.Xauthority.*
/home/[^/]+/.Xauth.*
/home/[^/]+/.xauth.*
/home/[^/]+/.Xauthority.*
/home/[^/]+/.serverauth.*
xserver_tmpfs_t
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.