selinux-refpolicy/policy/modules/services/cron.te

policy_module(cron, 2.3.0)

gen_require(`
	class passwd rootok;
')

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

## <desc>
## <p>
## Allow system cron jobs to relabel filesystem
## for restoring file contexts.
## </p>
## </desc>
gen_tunable(cron_can_relabel, false)

## <desc>
## <p>
## Enable extra rules in the cron domain
## to support fcron.
## </p>
## </desc>
gen_tunable(fcron_crond, false)

attribute cron_spool_type;

type anacron_exec_t;
application_executable_file(anacron_exec_t)

type cron_spool_t;
files_type(cron_spool_t)

# var/lib files
type cron_var_lib_t;
files_type(cron_var_lib_t)

type cron_var_run_t;
files_type(cron_var_run_t)

# var/log files
type cron_log_t;
logging_log_file(cron_log_t)

type cronjob_t;
typealias cronjob_t alias { user_crond_t staff_crond_t sysadm_crond_t };
typealias cronjob_t alias { auditadm_crond_t secadm_crond_t };
domain_type(cronjob_t)
domain_cron_exemption_target(cronjob_t)
corecmd_shell_entry_type(cronjob_t)
ubac_constrained(cronjob_t)

type crond_t;
type crond_exec_t;
init_daemon_domain(crond_t, crond_exec_t)
domain_interactive_fd(crond_t)
domain_cron_exemption_source(crond_t)

type crond_initrc_exec_t;
init_script_file(crond_initrc_exec_t)

type crond_tmp_t;
files_tmp_file(crond_tmp_t)

type crond_var_run_t;
files_pid_file(crond_var_run_t)

type crontab_exec_t;
application_executable_file(crontab_exec_t)

cron_common_crontab_template(admin_crontab)
typealias admin_crontab_t alias sysadm_crontab_t;
typealias admin_crontab_tmp_t alias sysadm_crontab_tmp_t;

cron_common_crontab_template(crontab)
typealias crontab_t alias { user_crontab_t staff_crontab_t };
typealias crontab_t alias { auditadm_crontab_t secadm_crontab_t };
typealias crontab_tmp_t alias { user_crontab_tmp_t staff_crontab_tmp_t };
typealias crontab_tmp_t alias { auditadm_crontab_tmp_t secadm_crontab_tmp_t };

type system_cron_spool_t, cron_spool_type;
files_type(system_cron_spool_t)

type system_cronjob_t alias system_crond_t;
init_daemon_domain(system_cronjob_t, anacron_exec_t)
corecmd_shell_entry_type(system_cronjob_t)
role system_r types system_cronjob_t;

type system_cronjob_lock_t alias system_crond_lock_t;
files_lock_file(system_cronjob_lock_t)

type system_cronjob_tmp_t alias system_crond_tmp_t;
files_tmp_file(system_cronjob_tmp_t)

ifdef(`enable_mcs',`
	init_ranged_daemon_domain(crond_t, crond_exec_t, s0 - mcs_systemhigh)
')

type unconfined_cronjob_t;
domain_type(unconfined_cronjob_t)
domain_cron_exemption_target(unconfined_cronjob_t)

# Type of user crontabs once moved to cron spool.
type user_cron_spool_t, cron_spool_type;
typealias user_cron_spool_t alias { staff_cron_spool_t sysadm_cron_spool_t unconfined_cron_spool_t };
typealias user_cron_spool_t alias { auditadm_cron_spool_t secadm_cron_spool_t };
files_type(user_cron_spool_t)
ubac_constrained(user_cron_spool_t)

########################################
#
# Admin crontab local policy
#

# Allow our crontab domain to unlink a user cron spool file.
allow admin_crontab_t user_cron_spool_t:file { getattr read unlink };

# Manipulate other users crontab.
selinux_get_fs_mount(admin_crontab_t)
selinux_validate_context(admin_crontab_t)
selinux_compute_access_vector(admin_crontab_t)
selinux_compute_create_context(admin_crontab_t)
selinux_compute_relabel_context(admin_crontab_t)
selinux_compute_user_contexts(admin_crontab_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
	allow admin_crontab_t self:process setfscreate;
')

########################################
#
# Cron daemon local policy
#

allow crond_t self:capability { dac_override setgid setuid sys_nice dac_read_search };
dontaudit crond_t self:capability { sys_resource sys_tty_config };
allow crond_t self:process ~{ ptrace setcurrent setexec setfscreate setrlimit execmem execstack execheap };
allow crond_t self:process { setexec setfscreate };
allow crond_t self:fd use;
allow crond_t self:fifo_file rw_fifo_file_perms;
allow crond_t self:unix_dgram_socket create_socket_perms;
allow crond_t self:unix_stream_socket create_stream_socket_perms;
allow crond_t self:unix_dgram_socket sendto;
allow crond_t self:unix_stream_socket connectto;
allow crond_t self:shm create_shm_perms;
allow crond_t self:sem create_sem_perms;
allow crond_t self:msgq create_msgq_perms;
allow crond_t self:msg { send receive };
allow crond_t self:key { search write link };

manage_files_pattern(crond_t, cron_log_t, cron_log_t)
logging_log_filetrans(crond_t, cron_log_t, file)

manage_files_pattern(crond_t, crond_var_run_t, crond_var_run_t)
files_pid_filetrans(crond_t, crond_var_run_t, file)

manage_files_pattern(crond_t, cron_spool_t, cron_spool_t)

manage_dirs_pattern(crond_t, crond_tmp_t, crond_tmp_t)
manage_files_pattern(crond_t, crond_tmp_t, crond_tmp_t)
files_tmp_filetrans(crond_t, crond_tmp_t, { file dir })

list_dirs_pattern(crond_t, system_cron_spool_t, system_cron_spool_t)
read_files_pattern(crond_t, system_cron_spool_t, system_cron_spool_t)

kernel_read_kernel_sysctls(crond_t)
kernel_read_fs_sysctls(crond_t)
kernel_search_key(crond_t)

dev_read_sysfs(crond_t)
selinux_get_fs_mount(crond_t)
selinux_validate_context(crond_t)
selinux_compute_access_vector(crond_t)
selinux_compute_create_context(crond_t)
selinux_compute_relabel_context(crond_t)
selinux_compute_user_contexts(crond_t)

dev_read_urand(crond_t)

fs_getattr_all_fs(crond_t)
fs_search_auto_mountpoints(crond_t)
fs_list_inotifyfs(crond_t)

# need auth_chkpwd to check for locked accounts.
auth_domtrans_chk_passwd(crond_t)

corecmd_exec_shell(crond_t)
corecmd_list_bin(crond_t)
corecmd_read_bin_symlinks(crond_t)

domain_use_interactive_fds(crond_t)

files_read_usr_files(crond_t)
files_read_etc_runtime_files(crond_t)
files_read_etc_files(crond_t)
files_read_generic_spool(crond_t)
files_list_usr(crond_t)
# Read from /var/spool/cron.
files_search_var_lib(crond_t)
files_search_default(crond_t)

init_rw_utmp(crond_t)
init_spec_domtrans_script(crond_t)

auth_use_nsswitch(crond_t)

logging_send_syslog_msg(crond_t)
logging_set_loginuid(crond_t)

seutil_read_config(crond_t)
seutil_read_default_contexts(crond_t)
seutil_sigchld_newrole(crond_t)

miscfiles_read_localization(crond_t)

userdom_use_unpriv_users_fds(crond_t)
# Not sure why this is needed
userdom_list_user_home_dirs(crond_t)

mta_send_mail(crond_t)

ifdef(`distro_debian',`
	# pam_limits is used
	allow crond_t self:process setrlimit;

	optional_policy(`
		# Debian logcheck has the home dir set to its cache
		logwatch_search_cache_dir(crond_t)
	')
')

ifdef(`distro_redhat', `
	# Run the rpm program in the rpm_t domain. Allow creation of RPM log files
	# via redirection of standard out.
	optional_policy(`
		rpm_manage_log(crond_t)
	')
')

tunable_policy(`allow_polyinstantiation',`
	files_polyinstantiate_all(crond_t)
')

tunable_policy(`fcron_crond', `
	allow crond_t system_cron_spool_t:file manage_file_perms;
')

optional_policy(`
	locallogin_search_keys(crond_t)
	locallogin_link_keys(crond_t)
')

optional_policy(`
	amanda_search_var_lib(crond_t)
')

optional_policy(`
	amavis_search_lib(crond_t)
')

optional_policy(`
	hal_dbus_chat(crond_t)
')

optional_policy(`
	# cjp: why?
	munin_search_lib(crond_t)
')

optional_policy(`
	rpc_search_nfs_state_data(crond_t)
')

optional_policy(`
	# Commonly used from postinst scripts
	rpm_read_pipes(crond_t)
')

optional_policy(`
	# allow crond to find /usr/lib/postgresql/bin/do.maintenance
	postgresql_search_db(crond_t)
')

optional_policy(`
	udev_read_db(crond_t)
')

########################################
#
# System cron process domain
#

allow system_cronjob_t self:capability { dac_override dac_read_search chown setgid setuid fowner net_bind_service fsetid sys_nice };
allow system_cronjob_t self:process { signal_perms getsched setsched };
allow system_cronjob_t self:fifo_file rw_fifo_file_perms;
allow system_cronjob_t self:passwd rootok;

# This is to handle creation of files in /var/log directory.
#  Used currently by rpm script log files
allow system_cronjob_t cron_log_t:file manage_file_perms;
logging_log_filetrans(system_cronjob_t, cron_log_t, file)

# This is to handle /var/lib/misc directory.  Used currently
# by prelink var/lib files for cron 
allow system_cronjob_t cron_var_lib_t:file manage_file_perms;
files_var_lib_filetrans(system_cronjob_t, cron_var_lib_t, file)

allow system_cronjob_t system_cron_spool_t:file read_file_perms;
# The entrypoint interface is not used as this is not
# a regular entrypoint.  Since crontab files are
# not directly executed, crond must ensure that
# the crontab file has a type that is appropriate
# for the domain of the user cron job.  It
# performs an entrypoint permission check
# for this purpose.
allow system_cronjob_t system_cron_spool_t:file entrypoint;

# Permit a transition from the crond_t domain to this domain.
# The transition is requested explicitly by the modified crond 
# via setexeccon.  There is no way to set up an automatic
# transition, since crontabs are configuration files, not executables.
allow crond_t system_cronjob_t:process transition;
dontaudit crond_t system_cronjob_t:process { noatsecure siginh rlimitinh };
allow crond_t system_cronjob_t:fd use;
allow system_cronjob_t crond_t:fd use;
allow system_cronjob_t crond_t:fifo_file rw_file_perms;
allow system_cronjob_t crond_t:process sigchld;

# Write /var/lock/makewhatis.lock.
allow system_cronjob_t system_cronjob_lock_t:file manage_file_perms;
files_lock_filetrans(system_cronjob_t, system_cronjob_lock_t, file)

# write temporary files
manage_files_pattern(system_cronjob_t, crond_tmp_t, system_cronjob_tmp_t)
manage_lnk_files_pattern(system_cronjob_t, crond_tmp_t, system_cronjob_tmp_t)
filetrans_pattern(system_cronjob_t, crond_tmp_t, system_cronjob_tmp_t, { file lnk_file })
files_tmp_filetrans(system_cronjob_t, system_cronjob_tmp_t, file)

# Read from /var/spool/cron.
allow system_cronjob_t cron_spool_t:dir list_dir_perms;
allow system_cronjob_t cron_spool_t:file read_file_perms;

kernel_read_kernel_sysctls(system_cronjob_t)
kernel_read_system_state(system_cronjob_t)
kernel_read_software_raid_state(system_cronjob_t)

# ps does not need to access /boot when run from cron
files_dontaudit_search_boot(system_cronjob_t)

corecmd_exec_all_executables(system_cronjob_t)

corenet_all_recvfrom_unlabeled(system_cronjob_t)
corenet_all_recvfrom_netlabel(system_cronjob_t)
corenet_tcp_sendrecv_generic_if(system_cronjob_t)
corenet_udp_sendrecv_generic_if(system_cronjob_t)
corenet_tcp_sendrecv_generic_node(system_cronjob_t)
corenet_udp_sendrecv_generic_node(system_cronjob_t)
corenet_tcp_sendrecv_all_ports(system_cronjob_t)
corenet_udp_sendrecv_all_ports(system_cronjob_t)

dev_getattr_all_blk_files(system_cronjob_t)
dev_getattr_all_chr_files(system_cronjob_t)
dev_read_urand(system_cronjob_t)

fs_getattr_all_fs(system_cronjob_t)
fs_getattr_all_files(system_cronjob_t)
fs_getattr_all_symlinks(system_cronjob_t)
fs_getattr_all_pipes(system_cronjob_t)
fs_getattr_all_sockets(system_cronjob_t)

# quiet other ps operations
domain_dontaudit_read_all_domains_state(system_cronjob_t)

files_exec_etc_files(system_cronjob_t)
files_read_etc_files(system_cronjob_t)
files_read_etc_runtime_files(system_cronjob_t)
files_list_all(system_cronjob_t)
files_getattr_all_dirs(system_cronjob_t)
files_getattr_all_files(system_cronjob_t)
files_getattr_all_symlinks(system_cronjob_t)
files_getattr_all_pipes(system_cronjob_t)
files_getattr_all_sockets(system_cronjob_t)
files_read_usr_files(system_cronjob_t)
files_read_var_files(system_cronjob_t)
# for nscd:
files_dontaudit_search_pids(system_cronjob_t)
# Access other spool directories like
# /var/spool/anacron and /var/spool/slrnpull.
files_manage_generic_spool(system_cronjob_t)

init_use_script_fds(system_cronjob_t)
init_read_utmp(system_cronjob_t)
init_dontaudit_rw_utmp(system_cronjob_t)
# prelink tells init to restart it self, we either need to allow or dontaudit
init_telinit(system_cronjob_t)
init_domtrans_script(system_cronjob_t)

auth_use_nsswitch(system_cronjob_t)

libs_exec_lib_files(system_cronjob_t)
libs_exec_ld_so(system_cronjob_t)

logging_read_generic_logs(system_cronjob_t)
logging_send_audit_msgs(system_cronjob_t)
logging_send_syslog_msg(system_cronjob_t)

miscfiles_read_localization(system_cronjob_t)
miscfiles_manage_man_pages(system_cronjob_t)

seutil_read_config(system_cronjob_t)

ifdef(`distro_redhat', `
	# Run the rpm program in the rpm_t domain. Allow creation of RPM log files
	# via redirection of standard out.
	optional_policy(`
		rpm_manage_log(system_cronjob_t)
	')
')

tunable_policy(`cron_can_relabel',`
	seutil_domtrans_setfiles(system_cronjob_t)
',`
	selinux_get_fs_mount(system_cronjob_t)
	selinux_validate_context(system_cronjob_t)
	selinux_compute_access_vector(system_cronjob_t)
	selinux_compute_create_context(system_cronjob_t)
	selinux_compute_relabel_context(system_cronjob_t)
	selinux_compute_user_contexts(system_cronjob_t)
	seutil_read_file_contexts(system_cronjob_t)
')

optional_policy(`
	# Needed for certwatch
	apache_exec_modules(system_cronjob_t)
	apache_read_config(system_cronjob_t)
	apache_read_log(system_cronjob_t)
	apache_read_sys_content(system_cronjob_t)
')

optional_policy(`
	cyrus_manage_data(system_cronjob_t)
')

optional_policy(`
	ftp_read_log(system_cronjob_t)
')

optional_policy(`
	inn_manage_log(system_cronjob_t)
	inn_manage_pid(system_cronjob_t)
	inn_read_config(system_cronjob_t)
')

optional_policy(`
	lpd_list_spool(system_cronjob_t)
')

optional_policy(`
	mrtg_append_create_logs(system_cronjob_t)
')

optional_policy(`
	mta_send_mail(system_cronjob_t)
')

optional_policy(`
	mysql_read_config(system_cronjob_t)
')

optional_policy(`
	postfix_read_config(system_cronjob_t)
')	

optional_policy(`
	prelink_delete_cache(system_cronjob_t)
	prelink_manage_lib(system_cronjob_t)
	prelink_manage_log(system_cronjob_t)
	prelink_read_cache(system_cronjob_t)
	prelink_relabelfrom_lib(system_cronjob_t)
')

optional_policy(`
	samba_read_config(system_cronjob_t)
	samba_read_log(system_cronjob_t)
	#samba_read_secrets(system_cronjob_t)
')

optional_policy(`
	slocate_create_append_log(system_cronjob_t)
')

optional_policy(`
	spamassassin_manage_lib_files(system_cronjob_t)
')

optional_policy(`
	sysstat_manage_log(system_cronjob_t)
')

optional_policy(`
	unconfined_domain(system_cronjob_t)
	userdom_user_home_dir_filetrans_user_home_content(system_cronjob_t, { dir file lnk_file fifo_file sock_file })
')

########################################
#
# User cronjobs local policy
#

allow cronjob_t self:process { signal_perms setsched };
allow cronjob_t self:fifo_file rw_fifo_file_perms;
allow cronjob_t self:unix_stream_socket create_stream_socket_perms;
allow cronjob_t self:unix_dgram_socket create_socket_perms;

# The entrypoint interface is not used as this is not
# a regular entrypoint.  Since crontab files are
# not directly executed, crond must ensure that
# the crontab file has a type that is appropriate
# for the domain of the user cron job.  It
# performs an entrypoint permission check
# for this purpose.
allow cronjob_t user_cron_spool_t:file entrypoint;

# Permit a transition from the crond_t domain to this domain.
# The transition is requested explicitly by the modified crond 
# via setexeccon.  There is no way to set up an automatic
# transition, since crontabs are configuration files, not executables.
allow crond_t cronjob_t:process transition;
dontaudit crond_t cronjob_t:process { noatsecure siginh rlimitinh };
allow crond_t cronjob_t:fd use;
allow cronjob_t crond_t:fd use;
allow cronjob_t crond_t:fifo_file rw_file_perms;
allow cronjob_t crond_t:process sigchld;

kernel_read_system_state(cronjob_t)
kernel_read_kernel_sysctls(cronjob_t)

# ps does not need to access /boot when run from cron
files_dontaudit_search_boot(cronjob_t)

corenet_all_recvfrom_unlabeled(cronjob_t)
corenet_all_recvfrom_netlabel(cronjob_t)
corenet_tcp_sendrecv_generic_if(cronjob_t)
corenet_udp_sendrecv_generic_if(cronjob_t)
corenet_tcp_sendrecv_generic_node(cronjob_t)
corenet_udp_sendrecv_generic_node(cronjob_t)
corenet_tcp_sendrecv_all_ports(cronjob_t)
corenet_udp_sendrecv_all_ports(cronjob_t)
corenet_tcp_connect_all_ports(cronjob_t)
corenet_sendrecv_all_client_packets(cronjob_t)

dev_read_urand(cronjob_t)

fs_getattr_all_fs(cronjob_t)

corecmd_exec_all_executables(cronjob_t)

# quiet other ps operations
domain_dontaudit_read_all_domains_state(cronjob_t)
domain_dontaudit_getattr_all_domains(cronjob_t)

files_read_usr_files(cronjob_t)
files_exec_etc_files(cronjob_t)
# for nscd:
files_dontaudit_search_pids(cronjob_t)

libs_exec_lib_files(cronjob_t)
libs_exec_ld_so(cronjob_t)

files_read_etc_runtime_files(cronjob_t)
files_read_var_files(cronjob_t)
files_search_spool(cronjob_t)

logging_search_logs(cronjob_t)

seutil_read_config(cronjob_t)

miscfiles_read_localization(cronjob_t)

userdom_manage_user_tmp_files(cronjob_t)
userdom_manage_user_tmp_symlinks(cronjob_t)
userdom_manage_user_tmp_pipes(cronjob_t)
userdom_manage_user_tmp_sockets(cronjob_t)
# Run scripts in user home directory and access shared libs.
userdom_exec_user_home_content_files(cronjob_t)
# Access user files and dirs.
userdom_manage_user_home_content_files(cronjob_t)
userdom_manage_user_home_content_symlinks(cronjob_t)
userdom_manage_user_home_content_pipes(cronjob_t)
userdom_manage_user_home_content_sockets(cronjob_t)
#userdom_user_home_dir_filetrans_user_home_content(cronjob_t, notdevfile_class_set)

list_dirs_pattern(crond_t, user_cron_spool_t, user_cron_spool_t)
read_files_pattern(crond_t, user_cron_spool_t, user_cron_spool_t)

tunable_policy(`fcron_crond', `
	allow crond_t user_cron_spool_t:file manage_file_perms;
')

# need a per-role version of this:
#optional_policy(`
#	mono_domtrans(cronjob_t)
#')

optional_policy(`
	nis_use_ypbind(cronjob_t)
')

########################################
#
# Unconfined cronjobs local policy
#

optional_policy(`
	# Permit a transition from the crond_t domain to this domain.
	# The transition is requested explicitly by the modified crond 
	# via setexeccon.  There is no way to set up an automatic
	# transition, since crontabs are configuration files, not executables.
	allow crond_t unconfined_cronjob_t:process transition;
	dontaudit crond_t unconfined_cronjob_t:process { noatsecure siginh rlimitinh };
	allow crond_t unconfined_cronjob_t:fd use;

	unconfined_domain(unconfined_cronjob_t)
')