## <summary>Run shells with substitute user and group</summary>

#######################################

## <summary>

##	The per user domain template for the su module.

## </summary>

## <desc>

##	

##	This template creates a derived domain which is allowed

##	to change the linux user id, to run shells as a different

##	user.

##	

##	

##	This template is invoked automatically for each user, and

##	generally does not need to be invoked directly

##	by policy writers.

##	

## </desc>

## <param name="userdomain_prefix">

##	The prefix of the user domain (e.g., user

##	is the prefix for user_t).

## </param>

## <param name="user_domain">

##	The type of the user domain.

## </param>

## <param name="user_role">

##	The role associated with the user domain.

## </param>

#

template(`su_per_userdomain_template',`

	# in optional since loadable modules do not natively

	# support per-userdomain templates yet.

	optional_policy(`su.te',`

		gen_require(`

			type su_exec_t;

		')

		type $1_su_t;

		domain_entry_file($1_su_t,su_exec_t)

		domain_type($1_su_t)

		domain_role_change_exempt($1_su_t)

		domain_subj_id_change_exempt($1_su_t)

		domain_obj_id_change_exempt($1_su_t)

		domain_wide_inherit_fd($1_su_t)

		role $3 types $1_su_t;

		allow $2 $1_su_t:process signal;

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

		dontaudit $1_su_t self:capability sys_tty_config;

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

		allow $1_su_t self:fifo_file rw_file_perms;

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

		# Transition from the user domain to this domain.

		domain_auto_trans($2, su_exec_t, $1_su_t)

		allow $2 $1_su_t:fd use;

		allow $1_su_t $2:fd use;

		allow $1_su_t $2:fifo_file rw_file_perms;

		allow $1_su_t $2:process sigchld;

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

		corecmd_shell_domtrans($1_su_t,$2)

		allow $2 $1_su_t:fd use;

		allow $1_su_t $2:fd use;

		allow $1_su_t $2:fifo_file rw_file_perms;

		allow $1_su_t $2:process sigchld;

		kernel_read_system_state($1_su_t)

		kernel_read_kernel_sysctl($1_su_t)

		# for SSP

		dev_read_urand($1_su_t)

		fs_search_auto_mountpoints($1_su_t)

		selinux_get_fs_mount($1_su_t)

		selinux_validate_context($1_su_t)

		selinux_compute_access_vector($1_su_t)

		selinux_compute_create_context($1_su_t)

		selinux_compute_relabel_context($1_su_t)

		selinux_compute_user_contexts($1_su_t)

		# Relabel ttys and ptys.

		term_relabel_all_user_ttys($1_su_t)

		term_relabel_all_user_ptys($1_su_t)

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

		term_use_all_user_ttys($1_su_t)

		term_use_all_user_ptys($1_su_t)

		auth_domtrans_user_chk_passwd($1_su_t,$1)

		auth_dontaudit_read_shadow($1_su_t)

		domain_wide_inherit_fd($1_su_t)

		files_read_etc_files($1_su_t)

		files_search_var_lib($1_su_t)

		init_dontaudit_use_fd($1_su_t)

		# Write to utmp.

		init_rw_script_pid($1_su_t)

		libs_use_ld_so($1_su_t)

		libs_use_shared_libs($1_su_t)

		logging_send_syslog_msg($1_su_t)

		miscfiles_read_localization($1_su_t)

		seutil_read_config($1_su_t)

		seutil_read_default_contexts($1_su_t)

		userdom_use_user_terminals($1,$1_su_t)

		if(secure_mode)

		{

			# Only allow transitions to unprivileged user domains.

			userdom_spec_domtrans_unpriv_users($1_su_t)

		} else {

			# Allow transitions to all user domains

			userdom_spec_domtrans_all_users($1_su_t)

		}

		if (use_nfs_home_dirs) {

			fs_search_nfs($1_su_t)

		}

		if (use_samba_home_dirs) {

			fs_search_cifs($1_su_t)

		}

		optional_policy(`crond.te',`

			cron_read_pipe($1_su_t)

		')

		optional_policy(`kerberos.te',`

			kerberos_use($1_su_t)

		')

		optional_policy(`nis.te',`

			nis_use_ypbind($1_su_t)

		')

		optional_policy(`nscd.te',`

			nscd_use_socket($1_su_t)

		')

		ifdef(`TODO',`

		ifdef(`support_polyinstantiation', `

		mls_file_read_up($1_su_t)

		mls_file_write_down($1_su_t)

		mls_file_upgrade($1_su_t)

		mls_file_downgrade($1_su_t)

		mls_process_set_level($1_su_t)

		# 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;

		')

		# Caused by su - init scripts

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

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

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

		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 };

		')

		# 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:file rw_file_perms;

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

		')

		') dnl end TODO

	')

')