staff_selinux(8) staff SELinux Policy documentation staff_selinux(8)NAME
staff_u - Administrator's unprivileged user role - Security Enhanced
Linux Policy
DESCRIPTION
staff_u is an SELinux User defined in the SELinux policy. SELinux users
have default roles, staff_r. The default role has a default type,
staff_t, associated with it.
The SELinux user will usually login to a system with a context that
looks like:
staff_u:staff_r:staff_u: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 staff_u
user, you would execute:
semanage login -m -s staff_u __default__
If you want to map the one Linux user (joe) to the SELinux user staff,
you would execute:
$ semanage login -a -s staff_u joe
USER DESCRIPTION
The SELinux user staff_u is defined in policy as a unprivileged user.
SELinux prevents unprivileged users from doing administration tasks
without transitioning to a different role.
SUDO
The SELinux user staff can execute sudo.
You can set up sudo to allow staff to transition to an administrative
domain:
Add one or more of the following record to sudoers using visudo.
USERNAME ALL=(ALL) ROLE=ftpadmin_r TYPE=ftpadmin_t COMMAND
sudo will run COMMAND as staff_u:ftpadmin_r:ftpadmin_t:LEVEL
USERNAME ALL=(ALL) ROLE=auditadm_r TYPE=auditadm_t COMMAND
sudo will run COMMAND as staff_u:auditadm_r:auditadm_t:LEVEL
USERNAME ALL=(ALL) ROLE=dbadm_r TYPE=dbadm_t COMMAND
sudo will run COMMAND as staff_u:dbadm_r:dbadm_t:LEVEL
USERNAME ALL=(ALL) ROLE=logadm_r TYPE=logadm_t COMMAND
sudo will run COMMAND as staff_u:logadm_r:logadm_t:LEVEL
USERNAME ALL=(ALL) ROLE=secadm_r TYPE=secadm_t COMMAND
sudo will run COMMAND as staff_u:secadm_r:secadm_t:LEVEL
USERNAME ALL=(ALL) ROLE=sysadm_r TYPE=sysadm_t COMMAND
sudo will run COMMAND as staff_u:sysadm_r:sysadm_t:LEVEL
USERNAME ALL=(ALL) ROLE=unconfined_r TYPE=unconfined_t COMMAND
sudo will run COMMAND as staff_u:unconfined_r:unconfined_t:LEVEL
USERNAME ALL=(ALL) ROLE=webadm_r TYPE=webadm_t COMMAND
sudo will run COMMAND as staff_u:webadm_r:webadm_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 staff_r to this list.
$ semanage user -m -R 'staff_r ftpadmin_r auditadm_r dbadm_r logadm_r
secadm_r sysadm_r unconfined_r webadm_r' staff_u
For more details you can see semanage man page.
X WINDOWS LOGIN
The SELinux user staff_u is able to X Windows login.
TERMINAL LOGIN
The SELinux user staff_u is able to terminal login.
NETWORK
The SELinux user staff_u is able to listen on the following tcp ports.
xserver_port_t: 6000-6020
The SELinux user staff_u is able to listen on the following udp ports.
all ports with out defined types
The SELinux user staff_u is able to connect to the following tcp ports.
all ports
BOOLEANS
SELinux policy is customizable based on least access required. staff_t
policy is extremely flexible and has several booleans that allow you to
manipulate the policy and run staff_t with the tightest access possi‐
ble.
If you want to allow users to connect to the local mysql server, you
must turn on the allow_user_mysql_connect boolean.
setsebool -P allow_user_mysql_connect 1
If you want to control users use of ping and traceroute, you must turn
on the user_ping boolean.
setsebool -P user_ping 1
If you want to allow w to display everyone, you must turn on the
user_ttyfile_stat boolean.
setsebool -P user_ttyfile_stat 1
If you want to allow user music sharing, you must turn on the
user_share_music boolean.
setsebool -P user_share_music 1
If you want to allow regular users direct dri device access, you must
turn on the user_direct_dri boolean.
setsebool -P user_direct_dri 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
user_rw_noexattrfile boolean.
setsebool -P user_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 user_tcp_server boolean.
setsebool -P user_tcp_server 1
If you want to allow regular users direct mouse access, you must turn
on the user_direct_mouse boolean.
setsebool -P user_direct_mouse 1
If you want to allow user processes to change their priority, you must
turn on the user_setrlimit boolean.
setsebool -P user_setrlimit 1
If you want to allow users to connect to PostgreSQL, you must turn on
the allow_user_postgresql_connect boolean.
setsebool -P allow_user_postgresql_connect 1
If you want to allow users to read system messages, you must turn on
the user_dmesg boolean.
setsebool -P user_dmesg 1
HOME_EXEC
The SELinux user staff_u is able execute home content files.
TRANSITIONS
Three things can happen when staff_t attempts to execute a program.
1. SELinux Policy can deny staff_t from executing the program.
2. SELinux Policy can allow staff_t to execute the program in the cur‐
rent user type.
Execute the following to see the types that the SELinux user
staff_t can execute without transitioning:
sesearch -A -s staff_t -c file -p execute_no_trans
3. SELinux can allow staff_t to execute the program and transition to a
new type.
Execute the following to see the types that the SELinux user
staff_t can execute and transition:
$ sesearch -A -s staff_t -c process -p transition
COMMANDS
semanage login can also be used to manipulate the Linux User to SELinux
User mappings
semanage user can also be used to manipulate SELinux user definitions.
system-config-selinux is a GUI tool available to customize SELinux pol‐
icy settings.
AUTHOR
This manual page was autogenerated by genuserman.py.
SEE ALSOselinux(8), semanage(8).
mgrepl@redhat.com staff staff_selinux(8)
