selinux-refpolicy/policy/modules/apps/userhelper.if

## <summary>SELinux utility to run a shell with a new role</summary>

#######################################
## <summary>
##	The role template for the userhelper module.
## </summary>
## <param name="userrole_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 user role.
##	</summary>
## </param>
## <param name="user_domain">
##	<summary>
##	The user domain associated with the role.
##	</summary>
## </param>
#
template(`userhelper_role_template',`
	gen_require(`
		attribute userhelper_type;
		type userhelper_exec_t, userhelper_conf_t;
	')

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

	type $1_userhelper_t, userhelper_type;
	application_domain($1_userhelper_t, userhelper_exec_t)
	domain_role_change_exemption($1_userhelper_t)
	domain_obj_id_change_exemption($1_userhelper_t)
	domain_interactive_fd($1_userhelper_t)
	domain_subj_id_change_exemption($1_userhelper_t)
	ubac_constrained($1_userhelper_t)
	role $2 types $1_userhelper_t;

	########################################
	#
	# Local policy
	#
	allow $1_userhelper_t self:capability { setuid setgid net_bind_service dac_override chown sys_tty_config };
	allow $1_userhelper_t self:process ~{ ptrace setcurrent setexec setfscreate setrlimit execmem execstack execheap };
	allow $1_userhelper_t self:process setexec;
	allow $1_userhelper_t self:fd use;
	allow $1_userhelper_t self:fifo_file rw_fifo_file_perms;
	allow $1_userhelper_t self:shm create_shm_perms;
	allow $1_userhelper_t self:sem create_sem_perms;
	allow $1_userhelper_t self:msgq create_msgq_perms;
	allow $1_userhelper_t self:msg { send receive };
	allow $1_userhelper_t self:unix_dgram_socket create_socket_perms;
	allow $1_userhelper_t self:unix_stream_socket create_stream_socket_perms;
	allow $1_userhelper_t self:unix_dgram_socket sendto;
	allow $1_userhelper_t self:unix_stream_socket connectto;
	allow $1_userhelper_t self:sock_file read_sock_file_perms;

	#Transition to the derived domain.
	domtrans_pattern($3, userhelper_exec_t, $1_userhelper_t)

	allow $1_userhelper_t userhelper_conf_t:dir rw_dir_perms;
	rw_files_pattern($1_userhelper_t, userhelper_conf_t, userhelper_conf_t)

	can_exec($1_userhelper_t, userhelper_exec_t)

	dontaudit $3 $1_userhelper_t:process signal;

	kernel_read_all_sysctls($1_userhelper_t)
	kernel_getattr_debugfs($1_userhelper_t)
	kernel_read_system_state($1_userhelper_t)

	# Execute shells
	corecmd_exec_shell($1_userhelper_t)
	# By default, revert to the calling domain when a program is executed
	corecmd_bin_domtrans($1_userhelper_t, $3)

	# Inherit descriptors from the current session.
	domain_use_interactive_fds($1_userhelper_t)
	# for when the user types "exec userhelper" at the command line
	domain_sigchld_interactive_fds($1_userhelper_t)

	dev_read_urand($1_userhelper_t)
	# Read /dev directories and any symbolic links.
	dev_list_all_dev_nodes($1_userhelper_t)

	files_list_var_lib($1_userhelper_t)
	# Read the /etc/security/default_type file
	files_read_etc_files($1_userhelper_t)
	# Read /var.
	files_read_var_files($1_userhelper_t)
	files_read_var_symlinks($1_userhelper_t)
	# for some PAM modules and for cwd
	files_search_home($1_userhelper_t)

	fs_search_auto_mountpoints($1_userhelper_t)
	fs_read_nfs_files($1_userhelper_t)
	fs_read_nfs_symlinks($1_userhelper_t)

	# Allow $1_userhelper to obtain contexts to relabel TTYs
	selinux_get_fs_mount($1_userhelper_t)
	selinux_validate_context($1_userhelper_t)
	selinux_compute_access_vector($1_userhelper_t)
	selinux_compute_create_context($1_userhelper_t)
	selinux_compute_relabel_context($1_userhelper_t)
	selinux_compute_user_contexts($1_userhelper_t)

	# Read the devpts root directory.
	term_list_ptys($1_userhelper_t)
	# Relabel terminals.
	term_relabel_all_ttys($1_userhelper_t)
	term_relabel_all_ptys($1_userhelper_t)
	# Access terminals.
	term_use_all_ttys($1_userhelper_t)
	term_use_all_ptys($1_userhelper_t)

	auth_domtrans_chk_passwd($1_userhelper_t)
	auth_manage_pam_pid($1_userhelper_t)
	auth_manage_var_auth($1_userhelper_t)
	auth_search_pam_console_data($1_userhelper_t)

	# Inherit descriptors from the current session.
	init_use_fds($1_userhelper_t)
	# Write to utmp.
	init_manage_utmp($1_userhelper_t)
	init_pid_filetrans_utmp($1_userhelper_t)

	miscfiles_read_localization($1_userhelper_t)

	seutil_read_config($1_userhelper_t)
	seutil_read_default_contexts($1_userhelper_t)

	# Allow $1_userhelper_t to transition to user domains.
	userdom_bin_spec_domtrans_unpriv_users($1_userhelper_t)
	userdom_entry_spec_domtrans_unpriv_users($1_userhelper_t)

	ifdef(`distro_redhat',`
		optional_policy(`
			# Allow transitioning to rpm_t, for up2date
			rpm_domtrans($1_userhelper_t)
		')
	')

	optional_policy(`
		ethereal_domtrans($1_userhelper_t)
	')

	optional_policy(`
		logging_send_syslog_msg($1_userhelper_t)
	')

	optional_policy(`
		nis_use_ypbind($1_userhelper_t)
	')

	optional_policy(`
		nscd_socket_use($1_userhelper_t)
	')

	optional_policy(`
		tunable_policy(`! secure_mode',`
			#if we are not in secure mode then we can transition to sysadm_t
			sysadm_bin_spec_domtrans($1_userhelper_t)
			sysadm_entry_spec_domtrans($1_userhelper_t)
		')
	')
')

########################################
## <summary>
##	Search the userhelper configuration directory.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`userhelper_search_config',`
	gen_require(`
		type userhelper_conf_t;
	')

	allow $1 userhelper_conf_t:dir search_dir_perms;
')

########################################
## <summary>
##	Do not audit attempts to search 
##	the userhelper configuration directory.
## </summary>
## <param name="domain">
##	<summary>
##	Domain to not audit.
##	</summary>
## </param>
#
interface(`userhelper_dontaudit_search_config',`
	gen_require(`
		type userhelper_conf_t;
	')

	dontaudit $1 userhelper_conf_t:dir search_dir_perms;
')

########################################
## <summary>
##	Allow domain to use userhelper file descriptor.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`userhelper_use_fd',`
	gen_require(`
		attribute userhelper_type;
	')

	allow $1 userhelper_type:fd use;
')

########################################
## <summary>
##	Allow domain to send sigchld to userhelper.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`userhelper_sigchld',`
	gen_require(`
		attribute userhelper_type;
	')

	allow $1 userhelper_type:process sigchld;
')

########################################
## <summary>
##	Execute the userhelper program in the caller domain.
## </summary>
## <param name="domain">
##	<summary>
##	The type of the process performing this action.
##	</summary>
## </param>
#
interface(`userhelper_exec',`
	gen_require(`
		type userhelper_exec_t;
	')

	can_exec($1, userhelper_exec_t)
')