## Periodic execution of scheduled commands. ####################################### ## ## The per role template for the cron module. ## ## ##

## This template creates a derived domains which are used ## for running programs on behalf of the user, from cron. ## A type for the user crontab is also created. ##

##

## This template is invoked automatically for each user, and ## generally does not need to be invoked directly ## by policy writers. ##

##
## ## ## The prefix of the user domain (e.g., user ## is the prefix for user_t). ## ## ## ## ## The type of the user domain. ## ## ## ## ## The role associated with the user domain. ## ## # template(`cron_per_role_template',` gen_require(` attribute cron_spool_type; type crond_t, cron_spool_t, crontab_exec_t; class dbus send_msg; ') # Type of user crontabs once moved to cron spool. type $1_cron_spool_t, cron_spool_type; files_type($1_cron_spool_t) type $1_crond_t; domain_type($1_crond_t) domain_cron_exemption_target($1_crond_t) corecmd_shell_entry_type($1_crond_t) role $3 types $1_crond_t; type $1_crontab_t; application_domain($1_crontab_t,crontab_exec_t) role $3 types $1_crontab_t; type $1_crontab_tmp_t; files_tmp_file($1_crontab_tmp_t) ############################## # # $1_crond_t local policy # allow $1_crond_t self:capability dac_override; allow $1_crond_t self:process { signal_perms setsched }; allow $1_crond_t self:fifo_file rw_fifo_file_perms; allow $1_crond_t self:unix_stream_socket create_stream_socket_perms; allow $1_crond_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 $1_crond_t $1_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 $1_crond_t:process transition; dontaudit crond_t $1_crond_t:process { noatsecure siginh rlimitinh }; allow crond_t $1_crond_t:fd use; allow $1_crond_t crond_t:fd use; allow $1_crond_t crond_t:fifo_file rw_file_perms; allow $1_crond_t crond_t:process sigchld; kernel_read_system_state($1_crond_t) kernel_read_kernel_sysctls($1_crond_t) # ps does not need to access /boot when run from cron files_dontaudit_search_boot($1_crond_t) corenet_all_recvfrom_unlabeled($1_crond_t) corenet_all_recvfrom_netlabel($1_crond_t) corenet_tcp_sendrecv_all_if($1_crond_t) corenet_udp_sendrecv_all_if($1_crond_t) corenet_tcp_sendrecv_all_nodes($1_crond_t) corenet_udp_sendrecv_all_nodes($1_crond_t) corenet_tcp_sendrecv_all_ports($1_crond_t) corenet_udp_sendrecv_all_ports($1_crond_t) corenet_tcp_connect_all_ports($1_crond_t) corenet_sendrecv_all_client_packets($1_crond_t) dev_read_urand($1_crond_t) fs_getattr_all_fs($1_crond_t) corecmd_exec_all_executables($1_crond_t) # quiet other ps operations domain_dontaudit_read_all_domains_state($1_crond_t) domain_dontaudit_getattr_all_domains($1_crond_t) files_read_usr_files($1_crond_t) files_exec_etc_files($1_crond_t) # for nscd: files_dontaudit_search_pids($1_crond_t) libs_use_ld_so($1_crond_t) libs_use_shared_libs($1_crond_t) libs_exec_lib_files($1_crond_t) libs_exec_ld_so($1_crond_t) files_read_etc_runtime_files($1_crond_t) files_read_var_files($1_crond_t) files_search_spool($1_crond_t) logging_search_logs($1_crond_t) seutil_read_config($1_crond_t) miscfiles_read_localization($1_crond_t) userdom_manage_user_tmp_files($1,$1_crond_t) userdom_manage_user_tmp_symlinks($1,$1_crond_t) userdom_manage_user_tmp_pipes($1,$1_crond_t) userdom_manage_user_tmp_sockets($1,$1_crond_t) # Run scripts in user home directory and access shared libs. userdom_exec_user_home_content_files($1,$1_crond_t) # Access user files and dirs. # userdom_manage_user_home_subdir_dirs($1,$1_crond_t) userdom_manage_user_home_content_files($1,$1_crond_t) userdom_manage_user_home_content_symlinks($1,$1_crond_t) userdom_manage_user_home_content_pipes($1,$1_crond_t) userdom_manage_user_home_content_sockets($1,$1_crond_t) # userdom_user_home_dir_filetrans_user_home_content($1,$1_crond_t,notdevfile_class_set) tunable_policy(`fcron_crond', ` allow crond_t $1_cron_spool_t:file manage_file_perms; ') # need a per-role version of this: #optional_policy(` # mono_domtrans($1_crond_t) #') optional_policy(` dbus_stub($1_crond_t) allow $1_crond_t $2:dbus send_msg; ') optional_policy(` nis_use_ypbind($1_crond_t) ') ifdef(`TODO',` optional_policy(` create_dir_file($1_crond_t, httpd_$1_content_t) ') allow $1_crond_t tmp_t:dir rw_dir_perms; type_transition $1_crond_t $1_tmp_t:{ file lnk_file sock_file fifo_file } $1_tmp_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 read_lnk_file_perms; # $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; ') ') dnl endif TODO ############################## # # $1_crontab_t local policy # # dac_override is to create the file in the directory under /tmp allow $1_crontab_t self:capability { fowner setuid setgid chown dac_override }; allow $1_crontab_t self:process signal_perms; # Transition from the user domain to the derived domain. domtrans_pattern($2, crontab_exec_t, $1_crontab_t) # crontab shows up in user ps ps_process_pattern($2,$1_crontab_t) # for ^Z allow $2 $1_crontab_t:process signal; # Allow crond to read those crontabs in cron spool. allow crond_t $1_cron_spool_t:file manage_file_perms; allow $1_crontab_t $1_crontab_tmp_t:file manage_file_perms; files_tmp_filetrans($1_crontab_t,$1_crontab_tmp_t,file) # create files in /var/spool/cron manage_files_pattern($1_crontab_t,cron_spool_t,$1_cron_spool_t) filetrans_pattern($1_crontab_t,cron_spool_t,$1_cron_spool_t,file) files_search_spool($1_crontab_t) # crontab signals crond by updating the mtime on the spooldir allow $1_crontab_t cron_spool_t:dir setattr; kernel_read_system_state($1_crontab_t) # for the checks used by crontab -u selinux_dontaudit_search_fs($1_crontab_t) fs_getattr_xattr_fs($1_crontab_t) # Run helper programs as the user domain corecmd_bin_domtrans($1_crontab_t,$2) corecmd_shell_domtrans($1_crontab_t,$2) domain_use_interactive_fds($1_crontab_t) files_read_etc_files($1_crontab_t) files_dontaudit_search_pids($1_crontab_t) libs_use_ld_so($1_crontab_t) libs_use_shared_libs($1_crontab_t) logging_send_syslog_msg($1_crontab_t) miscfiles_read_localization($1_crontab_t) seutil_read_config($1_crontab_t) userdom_manage_user_tmp_dirs($1,$1_crontab_t) userdom_manage_user_tmp_files($1,$1_crontab_t) # Access terminals. userdom_use_user_terminals($1,$1_crontab_t) # Read user crontabs userdom_read_user_home_content_files($1,$1_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 dontaudit $1_crontab_t crond_t:process signal; ') optional_policy(` nscd_socket_use($1_crontab_t) ') ifdef(`TODO',` # Read user crontabs dontaudit $1_crontab_t $1_home_dir_t:dir write; ') dnl endif TODO ') ####################################### ## ## The administrative functions template for the cron module. ## ## ##

## This template creates rules for administrating the cron service, ## allowing the specified user to manage other user crontabs. ##

##
## ## ## The prefix of the user domain (e.g., user ## is the prefix for user_t). ## ## ## # template(`cron_admin_template',` gen_require(` attribute cron_spool_type; type $1_crontab_t, $1_crond_t; ') # Allow our crontab domain to unlink a user cron spool file. allow $1_crontab_t cron_spool_type:file { getattr read unlink }; logging_read_generic_logs($1_crond_t) # Manipulate other users crontab. selinux_get_fs_mount($1_crontab_t) selinux_validate_context($1_crontab_t) selinux_compute_access_vector($1_crontab_t) selinux_compute_create_context($1_crontab_t) selinux_compute_relabel_context($1_crontab_t) selinux_compute_user_contexts($1_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 $1_crontab_t self:process setfscreate; selinux_get_fs_mount($1_crontab_t) ') ') ######################################## ## ## Make the specified program domain accessable ## from the system cron jobs. ## ## ## ## The type of the process to transition to. ## ## ## ## ## The type of the file used as an entrypoint to this domain. ## ## # interface(`cron_system_entry',` gen_require(` type crond_t, system_crond_t; ') domain_auto_trans(system_crond_t, $2, $1) # cjp: perhaps these four rules from the old # domain_auto_trans are not needed? allow $1 system_crond_t:fd use; allow $1 system_crond_t:fifo_file rw_file_perms; allow $1 system_crond_t:process sigchld; allow $1 crond_t:fifo_file rw_file_perms; allow $1 crond_t:fd use; allow $1 crond_t:process sigchld; role system_r types $1; ') ######################################## ## ## Inherit and use a file descriptor ## from the cron daemon. ## ## ## ## Domain allowed access. ## ## # interface(`cron_use_fds',` gen_require(` type crond_t; ') allow $1 crond_t:fd use; ') ######################################## ## ## Send a SIGCHLD signal to the cron daemon. ## ## ## ## Domain allowed access. ## ## # interface(`cron_sigchld',` gen_require(` type crond_t; ') allow $1 crond_t:process sigchld; ') ######################################## ## ## Read a cron daemon unnamed pipe. ## ## ## ## Domain allowed access. ## ## # interface(`cron_read_pipes',` gen_require(` type crond_t; ') allow $1 crond_t:fifo_file read_fifo_file_perms; ') ######################################## ## ## Do not audit attempts to write cron daemon unnamed pipes. ## ## ## ## Domain allowed access. ## ## # interface(`cron_dontaudit_write_pipes',` gen_require(` type crond_t; ') dontaudit $1 crond_t:fifo_file write; ') ######################################## ## ## Read and write a cron daemon unnamed pipe. ## ## ## ## Domain allowed access. ## ## # interface(`cron_rw_pipes',` gen_require(` type crond_t; ') allow $1 crond_t:fifo_file { getattr read write }; ') ######################################## ## ## Read, and write cron daemon TCP sockets. ## ## ## ## Domain allowed access. ## ## # interface(`cron_rw_tcp_sockets',` gen_require(` type crond_t; ') allow $1 crond_t:tcp_socket { read write }; ') ######################################## ## ## Search the directory containing user cron tables. ## ## ## ## The type of the process to performing this action. ## ## # interface(`cron_search_spool',` gen_require(` type cron_spool_t; ') files_search_spool($1) allow $1 cron_spool_t:dir search_dir_perms; ') ######################################## ## ## Execute anacron in the cron system domain. ## ## ## ## Domain allowed access. ## ## # interface(`cron_anacron_domtrans_system_job',` gen_require(` type system_crond_t, anacron_exec_t; ') domtrans_pattern($1,anacron_exec_t,system_crond_t) ') ######################################## ## ## Inherit and use a file descriptor ## from system cron jobs. ## ## ## ## Domain allowed access. ## ## # interface(`cron_use_system_job_fds',` gen_require(` type system_crond_t; ') allow $1 system_crond_t:fd use; ') ######################################## ## ## Write a system cron job unnamed pipe. ## ## ## ## Domain allowed access. ## ## # interface(`cron_write_system_job_pipes',` gen_require(` type system_crond_t; ') allow $1 system_crond_t:file write; ') ######################################## ## ## Read and write a system cron job unnamed pipe. ## ## ## ## Domain allowed access. ## ## # interface(`cron_rw_system_job_pipes',` gen_require(` type system_crond_t; ') allow $1 system_crond_t:fifo_file rw_fifo_file_perms; ') ######################################## ## ## Read temporary files from the system cron jobs. ## ## ## ## Domain allowed access. ## ## # interface(`cron_read_system_job_tmp_files',` gen_require(` type system_crond_tmp_t; ') files_search_tmp($1) allow $1 system_crond_tmp_t:file read_file_perms; ') ######################################## ## ## Do not audit attempts to append temporary ## files from the system cron jobs. ## ## ## ## Domain to not audit. ## ## # interface(`cron_dontaudit_append_system_job_tmp_files',` gen_require(` type system_crond_tmp_t; ') dontaudit $1 system_crond_tmp_t:file append; ')