selinux-policy/policy/modules/apps/screen.if

## <summary>GNU terminal multiplexer</summary>

#######################################
## <summary>
##	The per role template for the screen module.
## </summary>
## <desc>
##	<p>
##	This template creates a derived domains which are used
##	for screen sessions.
##	</p>
##	<p>
##	This template is invoked automatically for each user, and
##	generally does not need to be invoked directly
##	by policy writers.
##	</p>
## </desc>
## <param name="userdomain_prefix">
##	<summary>
##	The prefix of the user domain (e.g., user
##	is the prefix for user_t).
##	</summary>
## </param>
## <param name="user_domain">
##	<summary>
##	The type of the user domain.
##	</summary>
## </param>
## <param name="user_role">
##	<summary>
##	The role associated with the user domain.
##	</summary>
## </param>
#
template(`screen_per_role_template',`
	gen_require(`
		type screen_dir_t, screen_exec_t;
	')

	########################################
	#
	# Declarations
	#

	type $1_screen_t;
	domain_type($1_screen_t)
	domain_entry_file($1_screen_t,screen_exec_t)
	domain_interactive_fd($1_screen_t)
	role $3 types $1_screen_t;

	type $1_screen_tmp_t;
	files_tmp_file($1_screen_tmp_t)

	type $1_screen_ro_home_t;
	files_type($1_screen_ro_home_t)

	type $1_screen_var_run_t;
	files_pid_file($1_screen_var_run_t)
	
	########################################
	#
	# Local policy
	#

	allow $1_screen_t self:capability { setuid setgid fsetid };
	allow $1_screen_t self:process signal_perms;
	allow $1_screen_t self:tcp_socket create_stream_socket_perms;
	allow $1_screen_t self:udp_socket create_socket_perms;
	# Internal screen networking
	allow $1_screen_t self:fd use;
	allow $1_screen_t self:unix_stream_socket create_socket_perms;
	allow $1_screen_t self:unix_dgram_socket create_socket_perms;

	allow $1_screen_t $1_screen_tmp_t:dir create_dir_perms;
	allow $1_screen_t $1_screen_tmp_t:file create_file_perms;
	allow $1_screen_t $1_screen_tmp_t:fifo_file create_file_perms;
	files_tmp_filetrans($1_screen_t, $1_screen_tmp_t, { file dir })

	# Create fifo
	allow $1_screen_t screen_dir_t:dir rw_dir_perms;
	allow $1_screen_t screen_dir_t:dir create_dir_perms;
	allow $1_screen_t $1_screen_var_run_t:fifo_file create_file_perms;
	type_transition $1_screen_t screen_dir_t:fifo_file $1_screen_var_run_t;
	files_pid_filetrans($1_screen_t,screen_dir_t,dir)

	allow $1_screen_t $1_screen_ro_home_t:dir r_dir_perms;
	allow $1_screen_t $1_screen_ro_home_t:file r_file_perms;
	allow $1_screen_t $1_screen_ro_home_t:lnk_file { read getattr };

	domain_auto_trans($2, screen_exec_t, $1_screen_t)
	allow $2 $1_screen_t:process signal;
	allow $1_screen_t $2:process { signal sigchld };
	allow $1_screen_t $2:fd use;
	allow $1_screen_t $2:fifo_file rw_file_perms;
	allow $1_screen_t $1_home_dir_t:dir { search getattr };

	allow $2 $1_screen_ro_home_t:dir create_dir_perms;
	allow $2 $1_screen_ro_home_t:file create_file_perms;
	allow $2 $1_screen_ro_home_t:lnk_file create_lnk_perms;
	allow $2 $1_screen_ro_home_t:{ dir file lnk_file } { relabelfrom relabelto };
	
	kernel_read_system_state($1_screen_t)
	kernel_read_kernel_sysctls($1_screen_t)

	corecmd_list_bin($1_screen_t)
	corecmd_read_bin_files($1_screen_t)
	corecmd_read_bin_symlinks($1_screen_t)
	corecmd_read_bin_pipes($1_screen_t)
	corecmd_read_bin_sockets($1_screen_t)
	corecmd_list_sbin($1_screen_t)
	corecmd_read_sbin_symlinks($1_screen_t)
	corecmd_read_sbin_files($1_screen_t)
	corecmd_read_sbin_pipes($1_screen_t)
	corecmd_read_sbin_sockets($1_screen_t)
	# Revert to the user domain when a shell is executed.
	corecmd_shell_domtrans($1_screen_t,$2)
	corecmd_bin_domtrans($1_screen_t,$2)

	corenet_non_ipsec_sendrecv($1_screen_t)
	corenet_tcp_sendrecv_generic_if($1_screen_t)
	corenet_udp_sendrecv_generic_if($1_screen_t)
	corenet_tcp_sendrecv_all_nodes($1_screen_t)
	corenet_udp_sendrecv_all_nodes($1_screen_t)
	corenet_tcp_sendrecv_all_ports($1_screen_t)
	corenet_udp_sendrecv_all_ports($1_screen_t)
	corenet_tcp_connect_all_ports($1_screen_t)

	dev_dontaudit_getattr_all_chr_files($1_screen_t)
	dev_dontaudit_getattr_all_blk_files($1_screen_t)
	# for SSP
	dev_read_urand($1_screen_t)

	domain_use_interactive_fds($1_screen_t)

	files_search_tmp($1_screen_t)
	files_search_home($1_screen_t)
	files_list_home($1_screen_t)
	files_read_usr_files($1_screen_t)
	files_read_etc_files($1_screen_t)

	fs_search_auto_mountpoints($1_screen_t)
	fs_getattr_xattr_fs($1_screen_t)

	auth_dontaudit_read_shadow($1_screen_t)
	auth_dontaudit_exec_utempter($1_screen_t)

	# Write to utmp.
	init_rw_utmp($1_screen_t)

	libs_use_ld_so($1_screen_t)
	libs_use_shared_libs($1_screen_t)

	logging_send_syslog_msg($1_screen_t)

	miscfiles_read_localization($1_screen_t)

	seutil_read_config($1_screen_t)

	sysnet_read_config($1_screen_t)

	userdom_use_user_terminals($1,$1_screen_t)
	userdom_create_user_pty($1,$1_screen_t)
	userdom_user_home_domtrans($1,$1_screen_t,$2)
	userdom_setattr_user_ptys($1,$1_screen_t)

	tunable_policy(`read_default_t',`
		files_list_default($1_screen_t)
		files_read_default_files($1_screen_t)
		files_read_default_symlinks($1_screen_t)
		files_read_default_sockets($1_screen_t)
		files_read_default_pipes($1_screen_t)
	')

	tunable_policy(`use_samba_home_dirs',`
		fs_cifs_domtrans($1_screen_t,$2)
		fs_read_cifs_symlinks($1_screen_t)
		fs_list_cifs($1_screen_t)
	')

	tunable_policy(`use_nfs_home_dirs',`
		fs_nfs_domtrans($1_screen_t,$2)
		fs_list_nfs($1_screen_t)
		fs_read_nfs_symlinks($1_screen_t)
	')

	optional_policy(`
		nis_use_ypbind($1_screen_t)
	')

	optional_policy(`
		nscd_socket_use($1_screen_t)
	')

	ifdef(`TODO',`
	# Inherit and use descriptors from gnome-pty-helper.
	optional_policy(`
		allow $1_screen_t $1_gph_t:fd use;
	')
	') dnl TODO
')