#
# 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;

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

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 };
can_ypbind($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 };
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)
') 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)
ifdef(`chkpwd.te', `
# Run chkpwd.
can_exec($1_su_t, chkpwd_exec_t)
')

# 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;
}

# 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',`')

')