#

# Macros for su domains.

#

#

# Authors:  Stephen Smalley <sds@epoch.ncsc.mil> and Timothy Fraser

#

#

# su_domain(domain_prefix)

#

# Define a derived domain for the su program when executed

# by a user domain.

#

# The type declaration for the executable type for this program is

# provided separately in domains/program/su.te. 

#

undefine(`su_restricted_domain')

undefine(`su_mini_domain')

undefine(`su_domain')

ifdef(`su.te', `

define(`su_restricted_domain', `

# Derived domain based on the calling user domain and the program.

type $1_su_t, domain, privlog, privrole, privuser, privowner, privfd, nscd_client_domain;

ifdef(`support_polyinstantiation', `

typeattribute $1_su_t mlsfileread;

typeattribute $1_su_t mlsfilewrite;

typeattribute $1_su_t mlsfileupgrade;

typeattribute $1_su_t mlsfiledowngrade;

typeattribute $1_su_t mlsprocsetsl;

')

# for SSP

allow $1_su_t urandom_device_t:chr_file { getattr read };

# Transition from the user domain to this domain.

domain_auto_trans($1_t, su_exec_t, $1_su_t)

allow $1_su_t sbin_t:dir search;

uses_shlib($1_su_t)

allow $1_su_t etc_t:file { getattr read };

read_locale($1_su_t)

read_sysctl($1_su_t)

allow $1_su_t self:unix_dgram_socket { connect create write };

allow $1_su_t self:unix_stream_socket create_stream_socket_perms;

allow $1_su_t self:fifo_file rw_file_perms;

allow $1_su_t proc_t:dir search;

allow $1_su_t proc_t:lnk_file read;

r_dir_file($1_su_t, self)

allow $1_su_t proc_t:file read;

allow $1_su_t self:process { setsched setrlimit };

allow $1_su_t device_t:dir search;

allow $1_su_t self:process { fork sigchld };

nsswitch_domain($1_su_t)

r_dir_file($1_su_t, selinux_config_t)

dontaudit $1_su_t shadow_t:file { getattr read };

dontaudit $1_su_t home_root_t:dir search;

dontaudit $1_su_t init_t:fd use;

allow $1_su_t var_lib_t:dir search;

allow $1_t $1_su_t:process signal;

ifdef(`crond.te', `

allow $1_su_t crond_t:fifo_file read;

')

# Use capabilities.

allow $1_su_t self:capability { setuid setgid net_bind_service chown dac_override fowner sys_nice sys_resource audit_control audit_write };

dontaudit $1_su_t self:capability sys_tty_config;

#

# Caused by su - init scripts

#

dontaudit $1_su_t initrc_devpts_t:chr_file { getattr ioctl };

# By default, revert to the calling domain when a shell is executed.

domain_auto_trans($1_su_t, shell_exec_t, $1_t)

allow $1_su_t bin_t:dir search;

allow $1_su_t bin_t:lnk_file read;

# But also allow transitions to unprivileged user domains.

domain_trans($1_su_t, shell_exec_t, unpriv_userdomain)

can_setexec($1_su_t)

# Get security decisions

can_getsecurity($1_su_t)

r_dir_file($1_su_t, default_context_t)

allow $1_su_t privfd:fd use;

# Write to utmp.

allow $1_su_t { var_t var_run_t }:dir search;

allow $1_su_t initrc_var_run_t:file rw_file_perms;

can_kerberos($1_su_t)

ifdef(`chkpwd.te', `

domain_auto_trans($1_su_t, chkpwd_exec_t, $2_chkpwd_t)

')

allow $1_su_t self:netlink_audit_socket { nlmsg_relay create_netlink_socket_perms };

') dnl end su_restricted_domain

define(`su_mini_domain', `

su_restricted_domain($1,$1)

if(!secure_mode)

{

	# if we are not in secure mode then we can transition to sysadm_t

	domain_trans($1_su_t, shell_exec_t, sysadm_t)

}

# Relabel ttys and ptys.

allow $1_su_t device_t:dir { getattr read search };

allow $1_su_t { ttyfile ptyfile }:chr_file { relabelfrom relabelto };

# Close and re-open ttys and ptys to get the fd into the correct domain.

allow $1_su_t { ttyfile ptyfile }:chr_file { read write };

')dnl end su_mini_domain

define(`su_domain', `

su_mini_domain($1)

# Inherit and use descriptors from gnome-pty-helper.

ifdef(`gnome-pty-helper.te', `allow $1_su_t $1_gph_t:fd use;')

# The user role is authorized for this domain.

role $1_r types $1_su_t;

# Write to the user domain tty.

access_terminal($1_su_t, $1)

allow $1_su_t { home_root_t $1_home_dir_t }:dir search;

allow $1_su_t $1_home_t:file create_file_perms;

ifdef(`user_canbe_sysadm', `

allow $1_su_t home_dir_type:dir { search write };

', `

dontaudit $1_su_t home_dir_type:dir { search write };

')

allow $1_su_t autofs_t:dir { search getattr };

if (use_nfs_home_dirs) {

allow $1_su_t nfs_t:dir search;

}

if (use_samba_home_dirs) {

allow $1_su_t cifs_t:dir search;

}

ifdef(`support_polyinstantiation', `

# Su can polyinstantiate

polyinstantiater($1_su_t)

# Su has to unmount polyinstantiated directories (like home)

# that should not be polyinstantiated under the new user

allow $1_su_t fs_t:filesystem unmount;

# Su needs additional permission to mount over a previous mount

allow $1_su_t polymember:dir mounton;

')

# Modify .Xauthority file (via xauth program).

ifdef(`xauth.te', `

file_type_auto_trans($1_su_t, staff_home_dir_t, staff_xauth_home_t, file)

file_type_auto_trans($1_su_t, user_home_dir_t, user_xauth_home_t, file)

file_type_auto_trans($1_su_t, sysadm_home_dir_t, sysadm_xauth_home_t, file)

domain_auto_trans($1_su_t, xauth_exec_t, $1_xauth_t)

')

ifdef(`cyrus.te', `

allow $1_su_t cyrus_var_lib_t:dir search;

')

ifdef(`ssh.te', `

# Access sshd cookie files.

allow $1_su_t sshd_tmp_t:dir rw_dir_perms;

allow $1_su_t sshd_tmp_t:file rw_file_perms;

file_type_auto_trans($1_su_t, sshd_tmp_t, $1_tmp_t)

')

allow $1_su_t var_lib_t:dir search;

dontaudit $1_su_t init_t:fd use;

')dnl end su_domain

', `

define(`su_domain',`')

')