## Periodic execution of scheduled commands. ####################################### ## ## The per user domain 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_userdomain_template',` # 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; domain_type($1_crontab_t) domain_entry_file($1_crontab_t,crontab_exec_t) role $3 types $1_crontab_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_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_sysctl($1_crond_t) # ps does not need to access /boot when run from cron bootloader_dontaudit_search_boot($1_crond_t) corenet_tcp_sendrecv_all_if($1_crond_t) corenet_raw_sendrecv_all_if($1_crond_t) corenet_udp_sendrecv_all_if($1_crond_t) corenet_tcp_sendrecv_all_nodes($1_crond_t) corenet_raw_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_bind_all_nodes($1_crond_t) corenet_udp_bind_all_nodes($1_crond_t) dev_read_urand($1_crond_t) fs_getattr_all_fs($1_crond_t) domain_exec_all_entry_files($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) corecmd_exec_bin($1_crond_t) corecmd_exec_sbin($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) 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_files($1,$1_crond_t) tunable_policy(`fcron_crond', ` allow crond_t $1_cron_spool_t:file create_file_perms; ') optional_policy(`nis.te',` nis_use_ypbind($1_crond_t) ') ifdef(`TODO',` # Access user files and dirs. file_type_auto_trans($1_crond_t, $1_home_dir_t, $1_home_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 r_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; ') 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 r_file_perms; # quiet other ps operations dontaudit $1_crond_t domain:dir { getattr search }; ') dnl endif TODO ############################## # # $1_crontab_t local policy # # Transition from the user domain to the derived domain. domain_auto_trans($2, crontab_exec_t, $1_crontab_t) allow $2 $1_crontab_t:fd use; allow $1_crontab_t $2:fd use; allow $1_crontab_t $2:fifo_file rw_file_perms; allow $1_crontab_t $2:process sigchld; # 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 r_file_perms; # dac_override is to create the file in the directory under /tmp allow $1_crontab_t self:capability { setuid setgid chown dac_override }; allow $1_crontab_t self:process signal_perms; # create files in /var/spool/cron allow $1_crontab_t $1_cron_spool_t:file create_file_perms; allow $1_crontab_t cron_spool_t:dir rw_dir_perms; type_transition $1_crontab_t $1_cron_spool_t:file system_crond_tmp_t; # crontab signals crond by updating the mtime on the spooldir allow $1_crontab_t cron_spool_t:dir setattr; # 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_sbin_domtrans($1_crontab_t,$2) corecmd_shell_domtrans($1_crontab_t,$2) domain_use_wide_inherit_fd($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_dontaudit_search_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_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; ') ifdef(`TODO',` can_ps($1_t, $1_crontab_t) dontaudit $1_crontab_t proc_t:dir search; allow $1_crond_t tmp_t:dir rw_dir_perms; type_transition $1_crond_t $1_tmp_t:{ file dir } $1_tmp_t; # Read user crontabs allow $1_crontab_t { $1_home_t $1_home_dir_t }:dir r_dir_perms; dontaudit $1_crontab_t $1_home_dir_t:dir write; # Inherit and use descriptors from gnome-pty-helper. ifdef(`gnome-pty-helper.te', `allow $1_crontab_t $1_gph_t:fd use;') ') 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',` # 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; class fd use; class fifo_file rw_file_perms; class process sigchld; ') domain_auto_trans(system_crond_t, $2, $1) # cjp: perhaps these four rules from the old # domain_auto_trans are not needed? allow system_crond_t $1:fd use; 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 { getattr read write ioctl }; allow $1 crond_t:fd use; allow $1 crond_t:process sigchld; ') ######################################## ## ## Inherit and use a file descriptor ## from the cron daemon. ## ## ## Domain allowed access. ## # interface(`cron_use_fd',` gen_require(` type crond_t; class fd use; ') 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; class process sigchld; ') allow $1 crond_t:process sigchld; ') ######################################## ## ## Read a cron daemon unnamed pipe. ## ## ## Domain allowed access. ## # interface(`cron_read_pipe',` gen_require(` type crond_t; class file r_file_perms; ') allow $1 crond_t:file r_file_perms; ') ######################################## ## ## Read and write a cron daemon unnamed pipe. ## ## ## Domain allowed access. ## # interface(`cron_rw_pipe',` gen_require(` type crond_t; class file { read write }; ') allow $1 crond_t:file { 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; class dir search; ') files_search_spool($1) allow $1 cron_spool_t:dir search; ') ######################################## ## ## Inherit and use a file descriptor ## from system cron jobs. ## ## ## Domain allowed access. ## # interface(`cron_use_system_job_fd',` gen_require(` type system_crond_t; class fd use; ') allow $1 system_crond_t:fd use; ') ######################################## ## ## Wrate a system cron job unnamed pipe. ## ## ## Domain allowed access. ## # interface(`cron_write_system_job_pipe',` gen_require(` type system_crond_t; class file write; ') allow $1 system_crond_t:file write; ') ######################################## ## ## 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; class file r_file_perms; ') files_search_tmp($1) allow $1 system_crond_tmp_t:file r_file_perms; ')