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

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

#######################################
## <summary>
##	The role template for the screen module.
## </summary>
## <param name="role_prefix">
##	<summary>
##	The prefix of the user role (e.g., user
##	is the prefix for user_r).
##	</summary>
## </param>
## <param name="user_role">
##	<summary>
##	The role associated with the user domain.
##	</summary>
## </param>
## <param name="user_domain">
##	<summary>
##	The type of the user domain.
##	</summary>
## </param>
#
template(`screen_role_template',`
	gen_require(`
		type screen_exec_t, screen_tmp_t;
		type screen_home_t, screen_var_run_t;
	')

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

	type $1_screen_t;
	application_domain($1_screen_t, screen_exec_t)
	domain_interactive_fd($1_screen_t)
	ubac_constrained($1_screen_t)
	role $2 types $1_screen_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:fifo_file rw_fifo_file_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;

	manage_dirs_pattern($1_screen_t, screen_tmp_t, screen_tmp_t)
	manage_files_pattern($1_screen_t, screen_tmp_t, screen_tmp_t)
	manage_fifo_files_pattern($1_screen_t, screen_tmp_t, screen_tmp_t)
	files_tmp_filetrans($1_screen_t, screen_tmp_t, { file dir })

	# Create fifo
	manage_fifo_files_pattern($1_screen_t, screen_var_run_t, screen_var_run_t)
	manage_dirs_pattern($1_screen_t, screen_var_run_t, screen_var_run_t)
	files_pid_filetrans($1_screen_t, screen_var_run_t, dir)

	allow $1_screen_t screen_home_t:dir list_dir_perms;
	read_files_pattern($1_screen_t, screen_home_t, screen_home_t)
	read_lnk_files_pattern($1_screen_t, screen_home_t, screen_home_t)

	allow $1_screen_t $3:process signal;

	domtrans_pattern($3, screen_exec_t, $1_screen_t)
	allow $3 $1_screen_t:process { signal sigchld };
	allow $1_screen_t $3:process signal;

	manage_dirs_pattern($3, screen_home_t, screen_home_t)
	manage_files_pattern($3, screen_home_t, screen_home_t)
	manage_lnk_files_pattern($3, screen_home_t, screen_home_t)
	relabel_dirs_pattern($3, screen_home_t, screen_home_t)
	relabel_files_pattern($3, screen_home_t, screen_home_t)
	relabel_lnk_files_pattern($3, screen_home_t, screen_home_t)

	manage_dirs_pattern($3, screen_var_run_t, screen_var_run_t)
	manage_files_pattern($3, screen_var_run_t, screen_var_run_t)
	manage_lnk_files_pattern($3, screen_var_run_t, screen_var_run_t)
	manage_fifo_files_pattern($3, screen_var_run_t, screen_var_run_t)

	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)
	# Revert to the user domain when a shell is executed.
	corecmd_shell_domtrans($1_screen_t, $3)
	corecmd_bin_domtrans($1_screen_t, $3)

	corenet_all_recvfrom_unlabeled($1_screen_t)
	corenet_all_recvfrom_netlabel($1_screen_t)
	corenet_tcp_sendrecv_generic_if($1_screen_t)
	corenet_udp_sendrecv_generic_if($1_screen_t)
	corenet_tcp_sendrecv_generic_node($1_screen_t)
	corenet_udp_sendrecv_generic_node($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_domtrans_chk_passwd($1_screen_t)
	auth_use_nsswitch($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)

	logging_send_syslog_msg($1_screen_t)

	miscfiles_read_localization($1_screen_t)

	seutil_read_config($1_screen_t)

	userdom_use_user_terminals($1_screen_t)
	userdom_create_user_pty($1_screen_t)
	userdom_user_home_domtrans($1_screen_t, $3)
	userdom_setattr_user_ptys($1_screen_t)
	userdom_setattr_user_ttys($1_screen_t)

	tunable_policy(`use_samba_home_dirs',`
		fs_cifs_domtrans($1_screen_t, $3)
		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, $3)
		fs_list_nfs($1_screen_t)
		fs_read_nfs_symlinks($1_screen_t)
	')
')