selinux-policy/policy/modules/services/cron.if

## <summary>Periodic execution of scheduled commands.</summary>

#######################################
## <summary>
##	The common rules for a crontab domain.
## </summary>
## <param name="userdomain_prefix">
##	<summary>
##	The prefix of the user domain (e.g., user
##	is the prefix for user_t).
##	</summary>
## </param>
#
template(`cron_common_crontab_template',`
	gen_require(`
		type crond_t, crond_var_run_t, crontab_exec_t;
		type cron_spool_t, user_cron_spool_t;
	')

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

	type $1_t;
	application_domain($1_t, crontab_exec_t)
	ubac_constrained($1_t)

	type $1_tmp_t;
	files_tmp_file($1_tmp_t)

	##############################
	#
	# Local policy
	#

	# dac_override is to create the file in the directory under /tmp
	allow $1_t self:capability { fowner setuid setgid chown dac_override };
	allow $1_t self:process { setsched signal_perms };
	allow $1_t self:fifo_file rw_fifo_file_perms;

	allow $1_t crond_t:process signal;
	allow $1_t crond_var_run_t:file read_file_perms;

	manage_dirs_pattern($1_t, $1_tmp_t, $1_tmp_t)
	manage_files_pattern($1_t, $1_tmp_t, $1_tmp_t)
	files_tmp_filetrans($1_t, $1_tmp_t, { dir file })

	# create files in /var/spool/cron
	manage_files_pattern($1_t, { cron_spool_t user_cron_spool_t }, user_cron_spool_t)
	filetrans_pattern($1_t, cron_spool_t, user_cron_spool_t, file)
	files_list_spool($1_t)

	# crontab signals crond by updating the mtime on the spooldir
	allow $1_t cron_spool_t:dir setattr;

	kernel_read_system_state($1_t)

	# for the checks used by crontab -u
	selinux_dontaudit_search_fs($1_t)

	fs_getattr_xattr_fs($1_t)

	domain_use_interactive_fds($1_t)

	files_read_etc_files($1_t)
	files_read_usr_files($1_t)
	files_dontaudit_search_pids($1_t)

	auth_domtrans_chk_passwd($1_t)

	logging_send_syslog_msg($1_t)
	logging_send_audit_msgs($1_t)
	logging_set_loginuid($1_t)

	init_dontaudit_write_utmp($1_t)
	init_read_utmp($1_t)

	miscfiles_read_localization($1_t)

	seutil_read_config($1_t)

	userdom_manage_user_tmp_dirs($1_t)
	userdom_manage_user_tmp_files($1_t)
	# Access terminals.
	userdom_use_user_terminals($1_t)
	# Read user crontabs
	userdom_read_user_home_content_files($1_t)
	userdom_read_user_home_content_symlinks($1_t)

	tunable_policy(`fcron_crond',`
		# fcron wants an instant update of a crontab change for the administrator
		# also crontab does a security check for crontab -u
		dontaudit $1_t crond_t:process signal;
	')

	optional_policy(`
		nscd_socket_use($1_t)
	')
')

########################################
## <summary>
##	Role access for cron
## </summary>
## <param name="role">
##	<summary>
##	Role allowed access
##	</summary>
## </param>
## <param name="domain">
##	<summary>
##	User domain for the role
##	</summary>
## </param>
#
interface(`cron_role',`
	gen_require(`
		type cronjob_t, crontab_t, crontab_exec_t;
		type user_cron_spool_t;
		type crond_t;
	')

	role $1 types { cronjob_t crontab_t };

	# cronjob shows up in user ps
	ps_process_pattern($2, cronjob_t)

	# Transition from the user domain to the derived domain.
	domtrans_pattern($2, crontab_exec_t, crontab_t)

	allow crond_t $2:process transition;
	dontaudit crond_t $2:process { noatsecure siginh rlimitinh };
	allow $2 crond_t:process sigchld;

	# needs to be authorized SELinux context for cron
	allow $2 user_cron_spool_t:file entrypoint;

	# crontab shows up in user ps
	ps_process_pattern($2, crontab_t)
	allow $2 crontab_t:process { ptrace signal_perms };

	# Run helper programs as the user domain
	#corecmd_bin_domtrans(crontab_t, $2)
	#corecmd_shell_domtrans(crontab_t, $2)
	corecmd_exec_bin(crontab_t)
	corecmd_exec_shell(crontab_t)

	optional_policy(`
		gen_require(`
			class dbus send_msg;
		')

		dbus_stub(cronjob_t)
		allow cronjob_t $2:dbus send_msg;
	')
')

########################################
## <summary>
##	Role access for unconfined cronjobs
## </summary>
## <param name="role">
##	<summary>
##	Role allowed access
##	</summary>
## </param>
## <param name="domain">
##	<summary>
##	User domain for the role
##	</summary>
## </param>
#
interface(`cron_unconfined_role',`
	gen_require(`
		type unconfined_cronjob_t;
	')

	role $1 types unconfined_cronjob_t;

	# cronjob shows up in user ps
	ps_process_pattern($2, unconfined_cronjob_t)
	allow $2 unconfined_cronjob_t:process { ptrace signal_perms };

	optional_policy(`
		gen_require(`
			class dbus send_msg;
		')

		dbus_stub(unconfined_cronjob_t)
		allow unconfined_cronjob_t $2:dbus send_msg;
	')
')

########################################
## <summary>
##	Role access for cron
## </summary>
## <param name="role">
##	<summary>
##	Role allowed access
##	</summary>
## </param>
## <param name="domain">
##	<summary>
##	User domain for the role
##	</summary>
## </param>
#
interface(`cron_admin_role',`
	gen_require(`
		type cronjob_t, crontab_exec_t, admin_crontab_t, admin_crontab_tmp_t;
		class passwd crontab;
	')

	role $1 types { cronjob_t admin_crontab_t admin_crontab_tmp_t };

	# cronjob shows up in user ps
	ps_process_pattern($2, cronjob_t)

	# Manipulate other users crontab.
	allow $2 self:passwd crontab;

	# Transition from the user domain to the derived domain.
	domtrans_pattern($2, crontab_exec_t, admin_crontab_t)

	# crontab shows up in user ps
	ps_process_pattern($2, admin_crontab_t)
	allow $2 admin_crontab_t:process { ptrace signal_perms };

	# Run helper programs as the user domain
	#corecmd_bin_domtrans(admin_crontab_t, $2)
	#corecmd_shell_domtrans(admin_crontab_t, $2)
	corecmd_exec_bin(admin_crontab_t)
	corecmd_exec_shell(admin_crontab_t)

	optional_policy(`
		gen_require(`
			class dbus send_msg;
		')

		dbus_stub(admin_cronjob_t)
		allow cronjob_t $2:dbus send_msg;
	')
')

########################################
## <summary>
##	Make the specified program domain accessable
##	from the system cron jobs.
## </summary>
## <param name="domain">
##	<summary>
##	The type of the process to transition to.
##	</summary>
## </param>
## <param name="entrypoint">
##	<summary>
##	The type of the file used as an entrypoint to this domain.
##	</summary>
## </param>
#
interface(`cron_system_entry',`
	gen_require(`
		type crond_t, system_cronjob_t;
	')

	domtrans_pattern(system_cronjob_t, $2, $1)
	domtrans_pattern(crond_t, $2, $1)

	role system_r types $1;
')

########################################
## <summary>
##	Execute cron in the cron system domain.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed to transition.
##	</summary>
## </param>
#
interface(`cron_domtrans',`
	gen_require(`
		type system_cronjob_t, crond_exec_t;
	')

	domtrans_pattern($1, crond_exec_t, system_cronjob_t)
')

########################################
## <summary>
##	Execute crond_exec_t 
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`cron_exec',`
	gen_require(`
		type crond_exec_t;
	')

	can_exec($1, crond_exec_t)
')

########################################
## <summary>
##	Execute crond server in the nscd domain.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed to transition.
##	</summary>
## </param>
#
interface(`cron_initrc_domtrans',`
	gen_require(`
		type crond_initrc_exec_t;
	')

	init_labeled_script_domtrans($1, crond_initrc_exec_t)
')

########################################
## <summary>
##	Inherit and use a file descriptor
##	from the cron daemon.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`cron_use_fds',`
	gen_require(`
		type crond_t;
	')

	allow $1 crond_t:fd use;
')

########################################
## <summary>
##	Send a SIGCHLD signal to the cron daemon.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`cron_sigchld',`
	gen_require(`
		type crond_t;
	')

	allow $1 crond_t:process sigchld;
')

########################################
## <summary>
##	Read a cron daemon unnamed pipe.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`cron_read_pipes',`
	gen_require(`
		type crond_t;
	')

	allow $1 crond_t:fifo_file read_fifo_file_perms;
')

########################################
## <summary>
##	Do not audit attempts to write cron daemon unnamed pipes.
## </summary>
## <param name="domain">
##	<summary>
##	Domain to not audit.
##	</summary>
## </param>
#
interface(`cron_dontaudit_write_pipes',`
	gen_require(`
		type crond_t;
	')

	dontaudit $1 crond_t:fifo_file write;
')

########################################
## <summary>
##	Read and write a cron daemon unnamed pipe.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`cron_rw_pipes',`
	gen_require(`
		type crond_t;
	')

	allow $1 crond_t:fifo_file rw_inherited_fifo_file_perms;
')

########################################
## <summary>
##	Read and write inherited user spool files.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`cron_rw_inherited_user_spool_files',`
	gen_require(`
		type user_cron_spool_t;
	')

	allow $1 user_cron_spool_t:file rw_inherited_file_perms;
')

########################################
## <summary>
##	Read and write inherited spool files.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`cron_rw_inherited_spool_files',`
	gen_require(`
		type cron_spool_t;
	')

	allow $1 cron_spool_t:file rw_inherited_file_perms;
')

########################################
## <summary>
##	Read, and write cron daemon TCP sockets.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`cron_rw_tcp_sockets',`
	gen_require(`
		type crond_t;
	')

	allow $1 crond_t:tcp_socket { read write };
')

########################################
## <summary>
##	Dontaudit Read, and write cron daemon TCP sockets.
## </summary>
## <param name="domain">
##	<summary>
##	Domain to not audit.
##	</summary>
## </param>
#
interface(`cron_dontaudit_rw_tcp_sockets',`
	gen_require(`
		type crond_t;
	')

	dontaudit $1 crond_t:tcp_socket { read write };
')

########################################
## <summary>
##	Search the directory containing user cron tables.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`cron_search_spool',`
	gen_require(`
		type cron_spool_t;
	')

	files_search_spool($1)
	allow $1 cron_spool_t:dir search_dir_perms;
')

########################################
## <summary>
##	Manage pid files used by cron
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`cron_manage_pid_files',`
	gen_require(`
		type crond_var_run_t;
	')

	manage_files_pattern($1, crond_var_run_t, crond_var_run_t)
')

########################################
## <summary>
##	Execute anacron in the cron system domain.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed to transition.
##	</summary>
## </param>
#
interface(`cron_anacron_domtrans_system_job',`
	gen_require(`
		type system_cronjob_t, anacron_exec_t;
	')

	domtrans_pattern($1, anacron_exec_t, system_cronjob_t)
')

########################################
## <summary>
##	Inherit and use a file descriptor
##	from system cron jobs.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`cron_use_system_job_fds',`
	gen_require(`
		type system_cronjob_t;
	')

	allow $1 system_cronjob_t:fd use;
')

########################################
## <summary>
##	Write a system cron job unnamed pipe.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`cron_write_system_job_pipes',`
	gen_require(`
		type system_cronjob_t;
	')

	allow $1 system_cronjob_t:fifo_file write;
')

########################################
## <summary>
##	Read and write a system cron job unnamed pipe.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`cron_rw_system_job_pipes',`
	gen_require(`
		type system_cronjob_t;
	')

	allow $1 system_cronjob_t:fifo_file rw_inherited_fifo_file_perms;
')

########################################
## <summary>
##	Allow read/write unix stream sockets from the system cron jobs.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`cron_rw_system_job_stream_sockets',`
	gen_require(`
		type system_cronjob_t;
	')

	allow $1 system_cronjob_t:unix_stream_socket { read write };
')

########################################
## <summary>
##	Read temporary files from the system cron jobs.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`cron_read_system_job_tmp_files',`
	gen_require(`
		type system_cronjob_tmp_t, cron_var_run_t;
	')

	files_search_tmp($1)
	allow $1 system_cronjob_tmp_t:file read_file_perms;

	files_search_pids($1)
	allow $1 cron_var_run_t:file read_file_perms;
')

########################################
## <summary>
##	Do not audit attempts to append temporary
##	files from the system cron jobs.
## </summary>
## <param name="domain">
##	<summary>
##	Domain to not audit.
##	</summary>
## </param>
#
interface(`cron_dontaudit_append_system_job_tmp_files',`
	gen_require(`
		type system_cronjob_tmp_t;
	')

	dontaudit $1 system_cronjob_tmp_t:file append_file_perms;
')

########################################
## <summary>
##	Do not audit attempts to write temporary
##	files from the system cron jobs.
## </summary>
## <param name="domain">
##	<summary>
##	Domain to not audit.
##	</summary>
## </param>
#
interface(`cron_dontaudit_write_system_job_tmp_files',`
	gen_require(`
		type system_cronjob_tmp_t;
		type cron_var_run_t;
	')

	dontaudit $1 system_cronjob_tmp_t:file write_file_perms;
	dontaudit $1 cron_var_run_t:file write_file_perms;
')

########################################
## <summary>
##	Read temporary files from the system cron jobs.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`cron_read_system_job_lib_files',`
	gen_require(`
		type system_cronjob_var_lib_t;
	')

	read_files_pattern($1, system_cronjob_var_lib_t, system_cronjob_var_lib_t)
')

########################################
## <summary>
##	Manage files from the system cron jobs.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`cron_manage_system_job_lib_files',`
	gen_require(`
		type system_cronjob_var_lib_t;
	')

	manage_files_pattern($1, system_cronjob_var_lib_t, system_cronjob_var_lib_t)
')