#DESC Userhelper - SELinux utility to run a shell with a new role

#

# Authors:  Dan Walsh (Red Hat)

# Maintained by Dan Walsh <dwalsh@redhat.com>

#

#

# userhelper_domain(domain_prefix)

#

# Define a derived domain for the userhelper/userhelper program when executed by

# a user domain.  

#

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

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

#

define(`userhelper_domain',`

type $1_userhelper_t, domain, userhelperdomain, privlog, privrole, privowner, auth_chkpwd, privfd, privuser, nscd_client_domain;

in_user_role($1_userhelper_t)

role sysadm_r types $1_userhelper_t;

ifelse($1, sysadm, `

typealias sysadm_userhelper_t alias userhelper_t;

domain_auto_trans(initrc_t, userhelper_exec_t, sysadm_userhelper_t)

')

general_domain_access($1_userhelper_t);

uses_shlib($1_userhelper_t)

read_locale($1_userhelper_t)

read_sysctl($1_userhelper_t)

# for when the user types "exec userhelper" at the command line

allow $1_userhelper_t privfd:process sigchld;

domain_auto_trans($1_t, userhelper_exec_t, $1_userhelper_t)

# Inherit descriptors from the current session.

allow $1_userhelper_t { init_t privfd }:fd use;

can_exec($1_userhelper_t, { bin_t sbin_t userhelper_exec_t })

# Execute shells

allow $1_userhelper_t { sbin_t bin_t }:dir r_dir_perms;

allow $1_userhelper_t { sbin_t bin_t }:lnk_file read;

allow $1_userhelper_t shell_exec_t:file r_file_perms;

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

domain_auto_trans($1_userhelper_t, { bin_t sbin_t }, $1_t)

# Allow $1_userhelper_t to transition to user domains.

domain_trans($1_userhelper_t, { bin_t sbin_t exec_type }, unpriv_userdomain)

if (!secure_mode) {

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

	domain_trans($1_userhelper_t, { bin_t sbin_t exec_type }, sysadm_t)

}

can_setexec($1_userhelper_t)

ifdef(`distro_redhat', `

ifdef(`rpm.te', `

# Allow transitioning to rpm_t, for up2date

allow $1_userhelper_t rpm_t:process { transition siginh rlimitinh noatsecure };

')

')

# Use capabilities.

allow $1_userhelper_t self:capability { setuid setgid net_bind_service dac_override chown sys_tty_config };

# Write to utmp.

file_type_auto_trans($1_userhelper_t, var_run_t, initrc_var_run_t, file)

# Read the devpts root directory.

allow $1_userhelper_t devpts_t:dir r_dir_perms;

# Read the /etc/security/default_type file

allow $1_userhelper_t etc_t:file r_file_perms;

# Read /var.

r_dir_file($1_userhelper_t, var_t)

# Read /dev directories and any symbolic links.

allow $1_userhelper_t device_t:dir r_dir_perms;

# Relabel terminals.

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

# Access terminals.

allow $1_userhelper_t { ttyfile ptyfile devtty_t }:chr_file rw_file_perms;

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

#

# Allow $1_userhelper to obtain contexts to relabel TTYs

#

can_getsecurity($1_userhelper_t)

allow $1_userhelper_t fs_t:filesystem getattr;

# for some PAM modules and for cwd

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

allow $1_userhelper_t proc_t:dir search;

allow $1_userhelper_t proc_t:file { getattr read };

# for when the network connection is killed

dontaudit unpriv_userdomain $1_userhelper_t:process signal;

allow $1_userhelper_t userhelper_conf_t:file rw_file_perms;

allow $1_userhelper_t userhelper_conf_t:dir rw_dir_perms;

ifdef(`pam.te', `

allow $1_userhelper_t pam_var_run_t:dir create_dir_perms;

allow $1_userhelper_t pam_var_run_t:file create_file_perms;

')

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

allow $1_userhelper_t autofs_t:dir search;

role system_r types $1_userhelper_t;

r_dir_file($1_userhelper_t, nfs_t)

ifdef(`xdm.te', `

can_pipe_xdm($1_userhelper_t)

allow $1_userhelper_t xdm_var_run_t:dir search;

')

r_dir_file($1_userhelper_t, selinux_config_t)

r_dir_file($1_userhelper_t, default_context_t)

ifdef(`xauth.te', `

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

allow $1_userhelper_t $1_xauth_home_t:file { getattr read };

')

ifdef(`pamconsole.te', `

allow $1_userhelper_t pam_var_console_t:dir { search };

')

ifdef(`mozilla.te', `

domain_auto_trans($1_mozilla_t, userhelper_exec_t, $1_userhelper_t)

')

')dnl end userhelper macro