######################################## # # cron_per_userdomain_template(domainprefix) # define(`cron_per_userdomain_template',` # Type of user crontabs once moved to cron spool. type $1_cron_spool_t; files_file_type($1_cron_spool_t) type $1_crond_t; # user_crond_domain; domain_type($1_crond_t); corecmd_shell_entry_type($1_crond_t) role $1_r types $1_crond_t; type $1_crontab_t; domain_type($1_crontab_t) domain_entry_file($1_crontab_t,crontab_exec_t) role $1_r 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_generic_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) tunable_policy(`fcron_crond', ` allow crond_t $1_cron_spool_t:file create_file_perms; ') 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) 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; ') # 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 r_file_perms; # quiet other ps operations dontaudit $1_crond_t domain:dir { getattr search }; ') dnl endif TODO ############################## # # $1_crontab_t local policy # # for ^Z allow $1_t $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; allow $1_crontab_t crond_log_t:file ra_file_perms; fs_getattr_xattr_fs($1_crontab_t) domain_use_wide_inherit_fd($1_crontab_t) files_read_generic_etc_files($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) 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',` # Transition from the user domain to the derived domain. domain_auto_trans($1_t, crontab_exec_t, $1_crontab_t) can_ps($1_t, $1_crontab_t) dontaudit $1_crontab_t proc_t:dir search; dontaudit $1_crontab_t selinux_config_t:dir search; # for the checks used by crontab -u dontaudit $1_crontab_t security_t:dir search; # Type for temporary files. file_type_auto_trans($1_crontab_t, tmp_t, $1_tmp_t, { dir file }) # Use the type when creating files in /var/spool/cron. allow sysadm_crontab_t $1_cron_spool_t:file { getattr read }; # Run helper programs as $1_t allow $1_crontab_t { bin_t sbin_t }:dir search; allow $1_crontab_t bin_t:lnk_file read; domain_auto_trans($1_crontab_t, { bin_t sbin_t shell_exec_t }, $1_t) # Read user crontabs allow $1_crontab_t { $1_home_t $1_home_dir_t }:dir r_dir_perms; allow $1_crontab_t $1_home_t:file r_file_perms; dontaudit $1_crontab_t $1_home_dir_t:dir write; # Access terminals. allow $1_crontab_t devpts_t:dir r_dir_perms; allow $1_crontab_t $1_tty_device_t:chr_file rw_file_perms; allow $1_crontab_t $1_devpts_t:chr_file rw_file_perms; # Inherit and use descriptors from gnome-pty-helper. ifdef(`gnome-pty-helper.te', `allow $1_crontab_t $1_gph_t:fd use;') dontaudit $1_crontab_t var_run_t:dir search; ') dnl endif TODO ') ######################################## # # cron_admin_template(domainprefix) # define(`cron_admin_template',` logging_read_generic_logs($1_crond_t) # Allow our crontab domain to unlink a user cron spool file. #allow $1_crontab_t user_cron_spool_t:file unlink; # 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) ') ') ######################################## # # cron_rw_log(domain) # define(`cron_rw_log',` gen_require(` type crond_log_t; class file rw_file_perms; ') logging_search_logs($1) allow $1 crond_log_t:file rw_file_perms; ')