diff --git a/refpolicy/policy/modules/services/cron.if b/refpolicy/policy/modules/services/cron.if new file mode 100644 index 00000000..38487441 --- /dev/null +++ b/refpolicy/policy/modules/services/cron.if @@ -0,0 +1,115 @@ +# Copyright (C) 2005 Tresys Technology, LLC + +######################################## +# +# cron_per_userdomain_template(domain) +# + +define(`cron_per_userdomain_template',` + +# Type of user crontabs once moved to cron spool. +type $1_cron_spool_t; +files_make_file($1_cron_spool_t) + +type $1_crond_t; # user_crond_domain; +domain_make_domain($1_crond_t); +corecommands_make_shell_entrypoint($1_crond_t) +role $1_r types $1_crond_t; + +allow $1_crond_t self:capability dac_override; +allow $1_crond_t self:process { sigkill sigstop signull signal setsched }; +allow $1_crond_t self:fifo_file { read getattr write append }; +allow $1_crond_t self:unix_stream_socket { create ioctl read getattr write setattr append bind connect getopt setopt shutdown listen accept }; +allow $1_crond_t self:unix_dgram_socket { create ioctl read getattr write setattr append bind connect getopt setopt shutdown }; + +# 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 $1_crond_t $1_cron_spool_t:file entrypoint; + +ifdef(`fcron.te', ` +allow crond_t $1_cron_spool_t:file { create ioctl read getattr lock write setattr append link unlink rename }; +') + +kernel_read_system_state($1_crond_t) +kernel_read_kernel_sysctl($1_crond_t) + +corenetwork_network_tcp_on_all_interfaces($1_crond_t) +corenetwork_network_raw_on_all_interfaces($1_crond_t) +corenetwork_network_udp_on_all_interfaces($1_crond_t) +corenetwork_network_tcp_on_all_nodes($1_crond_t) +corenetwork_network_raw_on_all_nodes($1_crond_t) +corenetwork_network_udp_on_all_nodes($1_crond_t) +corenetwork_network_tcp_on_all_ports($1_crond_t) +corenetwork_network_udp_on_all_ports($1_crond_t) +corenetwork_bind_tcp_on_all_nodes($1_crond_t) +corenetwork_bind_udp_on_all_nodes($1_crond_t) + +devices_get_pseudorandom_data($1_crond_t) + +filesystem_get_all_filesystems_attributes($1_crond_t) + +domain_execute_all_entrypoint_programs($1_crond_t) + +files_read_general_application_resources($1_crond_t) +files_execute_system_config_script($1_crond_t) + +corecommands_execute_general_programs($1_crond_t) +corecommands_execute_system_programs($1_crond_t) + +libraries_use_dynamic_loader($1_crond_t) +libraries_read_shared_libraries($1_crond_t) +libraries_execute_library_scripts($1_crond_t) + +files_read_runtime_system_config($1_crond_t) + +selinux_read_config($1_crond_t) + +miscfiles_read_localization($1_crond_t) + +ifdef(`TODO',` +# Access user files and dirs. +allow $1_crond_t home_root_t:dir search; +file_type_auto_trans($1_crond_t, $1_home_dir_t, $1_home_t) + +# Run scripts in user home directory and access shared libs. +can_exec($1_crond_t, $1_home_t) + +file_type_auto_trans($1_crond_t, tmp_t, $1_tmp_t) + +# Permit a transition from the crond_t domain to this domain. +# The transition is requested explicitly by the modified crond +# via execve_secure. There is no way to set up an automatic +# transition, since crontabs are configuration files, not executables. +domain_trans(crond_t, shell_exec_t, $1_crond_t) + +ifdef(`mta.te', ` +domain_auto_trans($1_crond_t, sendmail_exec_t, $1_mail_t) +allow $1_crond_t sendmail_exec_t:lnk_file { getattr read }; + +# $1_mail_t should only be reading from the cron fifo not needing to write +dontaudit $1_mail_t crond_t:fifo_file write; +allow mta_user_agent $1_crond_t:fd use; +') + +# This domain is granted permissions common to most domains. +can_ypbind($1_crond_t) +allow $1_crond_t var_spool_t:dir search; +allow $1_crond_t var_t:dir r_dir_perms; +allow $1_crond_t var_t:file { getattr read ioctl }; +allow $1_crond_t var_log_t:dir search; + +can_exec($1_crond_t, ld_so_t) + +# ps does not need to access /boot when run from cron +dontaudit $1_crond_t boot_t:dir search; +# quiet other ps operations +dontaudit $1_crond_t domain:dir { getattr search }; +# for nscd +dontaudit $1_crond_t var_run_t:dir search; +') dnl endif TODO +') diff --git a/refpolicy/policy/modules/services/cron.te b/refpolicy/policy/modules/services/cron.te new file mode 100644 index 00000000..7580e9a1 --- /dev/null +++ b/refpolicy/policy/modules/services/cron.te @@ -0,0 +1,378 @@ +# Copyright (C) 2005 Tresys Technology, LLC + +policy_module(consoletype, 1.0) + +# NB The constraints file has some entries for crond_t, this makes it +# different from all other domains... + +######################################## +# +# Declarations +# + +type anacron_exec_t; +files_make_file(anacron_exec_t) + +# Allow system cron jobs to relabel filesystem for restoring file contexts. +bool cron_can_relabel false; + +type cron_spool_t; +files_make_file(cron_spool_t) + +type crond_t; #, privmail, privfd, nscd_client_domain +type crond_exec_t; +domain_make_daemon_domain(crond_t,crond_exec_t) +domain_make_file_descriptors_widely_inheritable(crond_t) + +type crond_log_t; +logging_make_log_file(crond_t,crond_log_t) + +type crond_tmp_t; +files_make_file(crond_tmp_t) + +type crond_var_run_t; +files_make_file(crond_var_run_t) + +type crontab_exec_t; +files_make_file(crontab_exec_t) + +type system_cron_spool_t; +type system_crond_t; #, privmail, nscd_client_domain; +domain_make_daemon_domain(system_crond_t,anacron_exec_t) +corecommands_make_shell_entrypoint(system_crond_t) +role system_r types system_crond_t; + +type system_crond_tmp_t; +files_make_file(system_crond_tmp_t) + +######################################## +# +# Cron Local policy +# + +allow crond_t self:capability { dac_override setgid setuid net_bind_service sys_nice }; +dontaudit crond_t self:capability { sys_resource sys_tty_config }; +allow crond_t self:process ~{ ptrace setcurrent setexec setfscreate setrlimit execmem dyntransition }; +allow crond_t self:process setexec; +allow crond_t self:fd use; +allow crond_t self:fifo_file { read getattr lock ioctl write append }; +allow crond_t self:unix_dgram_socket { create ioctl read getattr write setattr append bind connect getopt setopt shutdown }; +allow crond_t self:unix_stream_socket { create ioctl read getattr write setattr append bind connect getopt setopt shutdown listen accept }; +allow crond_t self:unix_dgram_socket sendto; +allow crond_t self:unix_stream_socket connectto; +allow crond_t self:shm { associate getattr setattr create destroy read write lock unix_read unix_write }; +allow crond_t self:sem { associate getattr setattr create destroy read write unix_read unix_write }; +allow crond_t self:msgq { associate getattr setattr create destroy read write enqueue unix_read unix_write }; +allow crond_t self:msg { send receive }; + +allow crond_t crond_log_t:file { create ioctl read getattr lock write setattr append link unlink rename }; + +allow crond_t crond_var_run_t:file { getattr create read write append setattr unlink }; +files_create_daemon_runtime_data(crond_t,crond_var_run_t) + +allow crond_t crond_tmp_t:dir { create read getattr lock setattr ioctl link unlink rename search add_name remove_name reparent write rmdir }; +allow crond_t crond_tmp_t:file { create ioctl read getattr lock write setattr append link unlink rename }; +files_create_private_tmp_data(crond_t, crond_tmp_t, { file dir }) + +kernel_read_kernel_sysctl(crond_t) +kernel_read_hardware_state(crond_t) +kernel_get_selinuxfs_mount_point(crond_t) +kernel_validate_selinux_context(crond_t) +kernel_compute_selinux_av(crond_t) +kernel_compute_create(crond_t) +kernel_compute_relabel(crond_t) +kernel_compute_reachable_user_contexts(crond_t) + +devices_get_pseudorandom_data(crond_t) + +filesystem_get_all_filesystems_attributes(crond_t) + +terminal_ignore_use_console(crond_t) + +init_use_file_descriptors(crond_t) +init_script_use_pseudoterminal(crond_t) + +domain_use_widely_inheritable_file_descriptors(crond_t) + +files_read_general_system_config(crond_t) + +libraries_use_dynamic_loader(crond_t) +libraries_read_shared_libraries(crond_t) + +logging_send_system_log_message(crond_t) + +selinux_read_config(crond_t) +selinux_read_default_contexts(crond_t) +selinux_newrole_sigchld(crond_t) + +miscfiles_read_localization(crond_t) + +# need auth_chkpwd to check for locked accounts. +authlogin_check_password_transition(crond_t) + +tunable_policy(`targeted_policy', ` +terminal_ignore_use_general_physical_terminal(crond_t) +terminal_ignore_use_general_pseudoterminal(crond_t) +files_ignore_read_rootfs_file(crond_t) +') + +optional_policy(`udev.te', ` +udev_read_database(crond_t) +') + +ifdef(`TODO',` +allow crond_t proc_t:dir r_dir_perms; +allow crond_t proc_t:lnk_file read; +dontaudit crond_t unpriv_userdomain:fd use; +allow crond_t autofs_t:dir { search getattr }; +dontaudit crond_t sysadm_home_dir_t:dir search; +optional_policy(`rhgb.te', ` +allow crond_t rhgb_t:process sigchld; +allow crond_t rhgb_t:fd use; +allow crond_t rhgb_t:fifo_file { read write }; +') + + +allow crond_t unpriv_userdomain:fd use; +can_ypbind(crond_t) +ifdef(`automount.te', ` +allow crond_t autofs_t:dir { search getattr }; +') + + +# for finding binaries and /bin/sh +allow crond_t { bin_t sbin_t }:dir search; +allow crond_t { bin_t sbin_t }:lnk_file read; + +# Read from /var/spool/cron. +allow crond_t var_lib_t:dir search; +allow crond_t var_spool_t:dir r_dir_perms; +allow crond_t cron_spool_t:dir r_dir_perms; +allow crond_t cron_spool_t:file r_file_perms; + +allow crond_t default_t:dir search; + +# crond tries to search /root. Not sure why. +allow crond_t sysadm_home_dir_t:dir r_dir_perms; + +# to search /home +allow crond_t home_root_t:dir { getattr search }; +allow crond_t user_home_dir_type:dir r_dir_perms; + +# Run a shell. +can_exec(crond_t, shell_exec_t) + +ifdef(`distro_redhat', ` +# Run the rpm program in the rpm_t domain. Allow creation of RPM log files +# via redirection of standard out. +ifdef(`rpm.te', ` +allow crond_t rpm_log_t: file create_file_perms; + +system_crond_entry(rpm_exec_t, rpm_t) +allow system_crond_t rpm_log_t:file create_file_perms; +') +') + +allow crond_t var_spool_t:file { getattr read }; + + +') dnl endif TODO + +######################################## +# +# System cron process domain +# + +allow system_crond_t self:capability { dac_override dac_read_search chown setgid setuid fowner net_bind_service fsetid }; +allow system_crond_t self:process { sigkill sigstop signull signal setsched }; +allow system_crond_t self:fifo_file { read getattr write append }; +allow system_crond_t self:passwd rootok; + +# 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_crond_t system_cron_spool_t:file entrypoint; + +allow system_crond_t system_cron_spool_t:file { getattr read }; + +kernel_read_kernel_sysctl(system_crond_t) +kernel_read_system_state(system_crond_t) +kernel_read_software_raid_state(system_crond_t) + +corenetwork_network_tcp_on_all_interfaces(system_crond_t) +corenetwork_network_raw_on_all_interfaces(system_crond_t) +corenetwork_network_udp_on_all_interfaces(system_crond_t) +corenetwork_network_tcp_on_all_nodes(system_crond_t) +corenetwork_network_raw_on_all_nodes(system_crond_t) +corenetwork_network_udp_on_all_nodes(system_crond_t) +corenetwork_network_tcp_on_all_ports(system_crond_t) +corenetwork_network_udp_on_all_ports(system_crond_t) +corenetwork_bind_tcp_on_all_nodes(system_crond_t) +corenetwork_bind_udp_on_all_nodes(system_crond_t) + +devices_get_all_block_device_attributes(system_crond_t) +devices_get_all_character_device_attributes(system_crond_t) +devices_get_pseudorandom_data(system_crond_t) + +filesystem_get_all_filesystems_attributes(system_crond_t) + +init_use_file_descriptors(system_crond_t) +init_script_use_file_descriptors(system_crond_t) +init_script_use_pseudoterminal(system_crond_t) +init_script_read_runtime_data(system_crond_t) +init_script_ignore_modify_runtime_data(system_crond_t) + +domain_execute_all_entrypoint_programs(system_crond_t) + +files_execute_system_config_script(system_crond_t) +files_read_general_system_config(system_crond_t) +files_read_runtime_system_config(system_crond_t) +files_read_all_directories(system_crond_t) +files_get_all_file_attributes(system_crond_t) +files_read_general_application_resources(system_crond_t) + +corecommands_execute_general_programs(system_crond_t) +corecommands_execute_system_programs(system_crond_t) + +libraries_use_dynamic_loader(system_crond_t) +libraries_read_shared_libraries(system_crond_t) +libraries_execute_library_scripts(system_crond_t) + +logging_read_system_logs(system_crond_t) +logging_send_system_log_message(system_crond_t) + +miscfiles_read_localization(system_crond_t) +miscfiles_read_man_pages(system_crond_t) +miscfiles_manage_man_page_cache(system_crond_t) + +selinux_read_config(system_crond_t) + +if (cron_can_relabel) { +selinux_setfiles_transition(system_crond_t) +} else { +kernel_get_selinuxfs_mount_point(system_crond_t) +kernel_validate_selinux_context(system_crond_t) +kernel_compute_selinux_av(system_crond_t) +kernel_compute_create(system_crond_t) +kernel_compute_relabel(system_crond_t) +kernel_compute_reachable_user_contexts(system_crond_t) +selinux_read_file_contexts(system_crond_t) +} + +ifdef(`TODO',` + +ifdef(`fcron.te', ` +allow crond_t system_cron_spool_t:file create_file_perms; +') + +# Permit a transition from the crond_t domain to this domain. +# The transition is requested explicitly by the modified crond +# via execve_secure. There is no way to set up an automatic +# transition, since crontabs are configuration files, not executables. +domain_trans(crond_t, shell_exec_t, system_crond_t) + +ifdef(`mta.te', ` +domain_auto_trans(system_crond_t, sendmail_exec_t, system_mail_t) +allow system_crond_t sendmail_exec_t:lnk_file { getattr read }; + +# system_mail_t should only be reading from the cron fifo not needing to write +dontaudit system_mail_t crond_t:fifo_file write; +allow mta_user_agent system_crond_t:fd use; +allow mta_user_agent system_crond_t:fd use; +r_dir_file(system_mail_t, crond_tmp_t) +') + +# This domain is granted permissions common to most domains. + +can_ypbind(system_crond_t) +allow system_crond_t var_spool_t:dir search; + +allow system_crond_t var_t:dir r_dir_perms; +allow system_crond_t var_t:file { getattr read ioctl }; + +can_exec(system_crond_t, ld_so_t) + +# ps does not need to access /boot when run from cron +dontaudit system_crond_t boot_t:dir search; +# quiet other ps operations +dontaudit system_crond_t domain:dir { getattr search }; +# for nscd +dontaudit system_crond_t var_run_t:dir search; + +allow system_crond_t proc_t:filesystem getattr; +allow system_crond_t usbdevfs_t:filesystem getattr; + +allow system_crond_t { sysfs_t rpc_pipefs_t }:dir getattr; + +# Access log files +file_type_auto_trans(system_crond_t, var_log_t, crond_log_t, file) + +allow crond_t system_cron_spool_t:dir r_dir_perms; +allow crond_t system_cron_spool_t:file r_file_perms; + +# Read from /var/spool/cron. +allow system_crond_t cron_spool_t:dir r_dir_perms; +allow system_crond_t cron_spool_t:file r_file_perms; + +# Write to /var/lib/slocate.db. +allow system_crond_t var_lib_t:dir rw_dir_perms; +allow system_crond_t var_lib_t:file create_file_perms; + +# Write /var/lock/makewhatis.lock. +lock_domain(system_crond) + +# for if /var/mail is a symlink +allow { system_crond_t crond_t } mail_spool_t:lnk_file read; +allow crond_t mail_spool_t:dir search; + +# Stat any file and search any directory for find. +allow system_crond_t fs_type:notdevfile_class_set getattr; + +# Create temporary files. +file_type_auto_trans(system_crond_t, { tmp_t crond_tmp_t }, system_crond_tmp_t) + +# Access other spool directories like +# /var/spool/anacron and /var/spool/slrnpull. +allow system_crond_t var_spool_t:file create_file_perms; +allow system_crond_t var_spool_t:dir rw_dir_perms; + +# Do not audit attempts to search unlabeled directories (e.g. slocate). +dontaudit system_crond_t unlabeled_t:dir r_dir_perms; +dontaudit system_crond_t unlabeled_t:file r_file_perms; + +# +# reading /var/spool/cron/mailman +# +allow system_crond_t devpts_t:filesystem getattr; +allow system_crond_t sysfs_t:filesystem getattr; +allow system_crond_t tmpfs_t:filesystem getattr; +allow system_crond_t rpc_pipefs_t:filesystem getattr; + +# +# These rules are here to allow system cron jobs to su +# +ifdef(`su.te', ` +su_restricted_domain(system_crond,system) +role system_r types system_crond_su_t; +allow system_crond_su_t crond_t:fifo_file ioctl; +') + +# +# prelink tells init to restart it self, we either need to allow or dontaudit +# +allow system_crond_t initctl_t:fifo_file write; +dontaudit userdomain system_crond_t:fd use; + +allow system_crond_t removable_t:filesystem { getattr }; +# +# Required for webalizer +# +ifdef(`apache.te', ` +allow system_crond_t httpd_log_t:file { getattr read }; +') + +') dnl end TODO