458 lines
12 KiB
Plaintext
458 lines
12 KiB
Plaintext
## <summary>Periodic execution of scheduled commands.</summary>
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#######################################
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## <summary>
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## The per user domain template for the cron module.
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## </summary>
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## <desc>
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## <p>
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## This template creates a derived domains which are used
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## for running programs on behalf of the user, from cron.
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## A type for the user crontab is also created.
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## </p>
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## <p>
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## This template is invoked automatically for each user, and
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## generally does not need to be invoked directly
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## by policy writers.
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## </p>
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## </desc>
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## <param name="userdomain_prefix">
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## The prefix of the user domain (e.g., user
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## is the prefix for user_t).
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## </param>
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## <param name="user_domain">
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## The type of the user domain.
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## </param>
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## <param name="user_role">
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## The role associated with the user domain.
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## </param>
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#
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template(`cron_per_userdomain_template',`
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# Type of user crontabs once moved to cron spool.
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type $1_cron_spool_t, cron_spool_type;
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files_type($1_cron_spool_t)
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type $1_crond_t;
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domain_type($1_crond_t)
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domain_cron_exemption_target($1_crond_t)
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corecmd_shell_entry_type($1_crond_t)
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role $3 types $1_crond_t;
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type $1_crontab_t;
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domain_type($1_crontab_t)
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domain_entry_file($1_crontab_t,crontab_exec_t)
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role $3 types $1_crontab_t;
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##############################
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#
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# $1_crond_t local policy
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#
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allow $1_crond_t self:capability dac_override;
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allow $1_crond_t self:process { signal_perms setsched };
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allow $1_crond_t self:fifo_file rw_file_perms;
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allow $1_crond_t self:unix_stream_socket create_stream_socket_perms;
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allow $1_crond_t self:unix_dgram_socket create_socket_perms;
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# The entrypoint interface is not used as this is not
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# a regular entrypoint. Since crontab files are
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# not directly executed, crond must ensure that
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# the crontab file has a type that is appropriate
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# for the domain of the user cron job. It
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# performs an entrypoint permission check
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# for this purpose.
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allow $1_crond_t $1_cron_spool_t:file entrypoint;
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# Permit a transition from the crond_t domain to this domain.
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# The transition is requested explicitly by the modified crond
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# via setexeccon. There is no way to set up an automatic
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# transition, since crontabs are configuration files, not executables.
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allow crond_t $1_crond_t:process transition;
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dontaudit crond_t $1_crond_t:process { noatsecure siginh rlimitinh };
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allow crond_t $1_crond_t:fd use;
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allow $1_crond_t crond_t:fd use;
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allow $1_crond_t crond_t:fifo_file rw_file_perms;
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allow $1_crond_t crond_t:process sigchld;
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kernel_read_system_state($1_crond_t)
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kernel_read_kernel_sysctl($1_crond_t)
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# ps does not need to access /boot when run from cron
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bootloader_dontaudit_search_boot($1_crond_t)
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corenet_tcp_sendrecv_all_if($1_crond_t)
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corenet_raw_sendrecv_all_if($1_crond_t)
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corenet_udp_sendrecv_all_if($1_crond_t)
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corenet_tcp_sendrecv_all_nodes($1_crond_t)
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corenet_raw_sendrecv_all_nodes($1_crond_t)
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corenet_udp_sendrecv_all_nodes($1_crond_t)
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corenet_tcp_sendrecv_all_ports($1_crond_t)
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corenet_udp_sendrecv_all_ports($1_crond_t)
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corenet_tcp_bind_all_nodes($1_crond_t)
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corenet_udp_bind_all_nodes($1_crond_t)
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corenet_tcp_connect_all_ports($1_crond_t)
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dev_read_urand($1_crond_t)
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fs_getattr_all_fs($1_crond_t)
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domain_exec_all_entry_files($1_crond_t)
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files_read_usr_files($1_crond_t)
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files_exec_etc_files($1_crond_t)
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# for nscd:
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files_dontaudit_search_pids($1_crond_t)
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corecmd_exec_bin($1_crond_t)
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corecmd_exec_sbin($1_crond_t)
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libs_use_ld_so($1_crond_t)
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libs_use_shared_libs($1_crond_t)
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libs_exec_lib_files($1_crond_t)
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libs_exec_ld_so($1_crond_t)
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files_read_etc_runtime_files($1_crond_t)
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logging_search_logs($1_crond_t)
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seutil_read_config($1_crond_t)
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miscfiles_read_localization($1_crond_t)
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userdom_manage_user_tmp_files($1,$1_crond_t)
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userdom_manage_user_tmp_symlinks($1,$1_crond_t)
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userdom_manage_user_tmp_pipes($1,$1_crond_t)
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userdom_manage_user_tmp_sockets($1,$1_crond_t)
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# Run scripts in user home directory and access shared libs.
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userdom_exec_user_home_files($1,$1_crond_t)
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tunable_policy(`fcron_crond', `
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allow crond_t $1_cron_spool_t:file create_file_perms;
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')
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optional_policy(`nis.te',`
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nis_use_ypbind($1_crond_t)
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')
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ifdef(`TODO',`
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# Access user files and dirs.
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file_type_auto_trans($1_crond_t, $1_home_dir_t, $1_home_t)
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allow $1_crond_t tmp_t:dir rw_dir_perms;
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type_transition $1_crond_t $1_tmp_t:{ file lnk_file sock_file fifo_file } $1_tmp_t;
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ifdef(`mta.te', `
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domain_auto_trans($1_crond_t, sendmail_exec_t, $1_mail_t)
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allow $1_crond_t sendmail_exec_t:lnk_file r_file_perms;
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# $1_mail_t should only be reading from the cron fifo not needing to write
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dontaudit $1_mail_t crond_t:fifo_file write;
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allow mta_user_agent $1_crond_t:fd use;
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')
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allow $1_crond_t var_spool_t:dir search;
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allow $1_crond_t var_t:dir r_dir_perms;
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allow $1_crond_t var_t:file r_file_perms;
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# quiet other ps operations
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dontaudit $1_crond_t domain:dir { getattr search };
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') dnl endif TODO
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##############################
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#
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# $1_crontab_t local policy
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#
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# Transition from the user domain to the derived domain.
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domain_auto_trans($2, crontab_exec_t, $1_crontab_t)
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allow $2 $1_crontab_t:fd use;
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allow $1_crontab_t $2:fd use;
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allow $1_crontab_t $2:fifo_file rw_file_perms;
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allow $1_crontab_t $2:process sigchld;
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# for ^Z
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allow $2 $1_crontab_t:process signal;
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# Allow crond to read those crontabs in cron spool.
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allow crond_t $1_cron_spool_t:file r_file_perms;
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# dac_override is to create the file in the directory under /tmp
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allow $1_crontab_t self:capability { setuid setgid chown dac_override };
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allow $1_crontab_t self:process signal_perms;
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# create files in /var/spool/cron
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allow $1_crontab_t $1_cron_spool_t:file create_file_perms;
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allow $1_crontab_t cron_spool_t:dir rw_dir_perms;
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type_transition $1_crontab_t $1_cron_spool_t:file system_crond_tmp_t;
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# crontab signals crond by updating the mtime on the spooldir
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allow $1_crontab_t cron_spool_t:dir setattr;
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kernel_read_system_state($1_crontab_t)
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# for the checks used by crontab -u
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selinux_dontaudit_search_fs($1_crontab_t)
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fs_getattr_xattr_fs($1_crontab_t)
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# Run helper programs as the user domain
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corecmd_bin_domtrans($1_crontab_t,$2)
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corecmd_sbin_domtrans($1_crontab_t,$2)
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corecmd_shell_domtrans($1_crontab_t,$2)
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domain_use_wide_inherit_fd($1_crontab_t)
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files_read_etc_files($1_crontab_t)
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files_dontaudit_search_pids($1_crontab_t)
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libs_use_ld_so($1_crontab_t)
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libs_use_shared_libs($1_crontab_t)
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logging_send_syslog_msg($1_crontab_t)
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miscfiles_read_localization($1_crontab_t)
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seutil_read_config($1_crontab_t)
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userdom_manage_user_tmp_dirs($1,$1_crontab_t)
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userdom_manage_user_tmp_files($1,$1_crontab_t)
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# Access terminals.
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userdom_use_user_terminals($1,$1_crontab_t)
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# Read user crontabs
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userdom_read_user_home_files($1,$1_crontab_t)
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tunable_policy(`fcron_crond', `
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# fcron wants an instant update of a crontab change for the administrator
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# also crontab does a security check for crontab -u
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dontaudit $1_crontab_t crond_t:process signal;
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')
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ifdef(`TODO',`
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can_ps($1_t, $1_crontab_t)
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dontaudit $1_crontab_t proc_t:dir search;
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allow $1_crond_t tmp_t:dir rw_dir_perms;
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type_transition $1_crond_t $1_tmp_t:{ file dir } $1_tmp_t;
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# Read user crontabs
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allow $1_crontab_t { $1_home_t $1_home_dir_t }:dir r_dir_perms;
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dontaudit $1_crontab_t $1_home_dir_t:dir write;
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# Inherit and use descriptors from gnome-pty-helper.
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ifdef(`gnome-pty-helper.te', `allow $1_crontab_t $1_gph_t:fd use;')
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') dnl endif TODO
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')
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#######################################
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## <summary>
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## The administrative functions template for the cron module.
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## </summary>
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## <desc>
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## <p>
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## This template creates rules for administrating the cron service,
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## allowing the specified user to manage other user crontabs.
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## </p>
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## </desc>
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## <param name="userdomain_prefix">
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## The prefix of the user domain (e.g., user
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## is the prefix for user_t).
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## </param>
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#
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template(`cron_admin_template',`
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# Allow our crontab domain to unlink a user cron spool file.
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allow $1_crontab_t cron_spool_type:file { getattr read unlink };
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logging_read_generic_logs($1_crond_t)
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# Manipulate other users crontab.
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selinux_get_fs_mount($1_crontab_t)
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selinux_validate_context($1_crontab_t)
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selinux_compute_access_vector($1_crontab_t)
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selinux_compute_create_context($1_crontab_t)
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selinux_compute_relabel_context($1_crontab_t)
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selinux_compute_user_contexts($1_crontab_t)
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tunable_policy(`fcron_crond', `
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# fcron wants an instant update of a crontab change for the administrator
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# also crontab does a security check for crontab -u
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allow $1_crontab_t self:process setfscreate;
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selinux_get_fs_mount($1_crontab_t)
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')
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')
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########################################
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## <summary>
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## Make the specified program domain accessable
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## from the system cron jobs.
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## </summary>
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## <param name="domain">
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## The type of the process to transition to.
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## </param>
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## <param name="entrypoint">
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## The type of the file used as an entrypoint to this domain.
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## </param>
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#
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interface(`cron_system_entry',`
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gen_require(`
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type crond_t, system_crond_t;
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class fd use;
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class fifo_file rw_file_perms;
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class process sigchld;
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')
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domain_auto_trans(system_crond_t, $2, $1)
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# cjp: perhaps these four rules from the old
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# domain_auto_trans are not needed?
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allow system_crond_t $1:fd use;
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allow $1 system_crond_t:fd use;
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allow $1 system_crond_t:fifo_file rw_file_perms;
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allow $1 system_crond_t:process sigchld;
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allow $1 crond_t:fifo_file { getattr read write ioctl };
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allow $1 crond_t:fd use;
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allow $1 crond_t:process sigchld;
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')
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########################################
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## <summary>
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## Inherit and use a file descriptor
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## from the cron daemon.
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## </summary>
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## <param name="domain">
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## Domain allowed access.
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## </param>
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#
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interface(`cron_use_fd',`
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gen_require(`
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type crond_t;
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class fd use;
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')
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allow $1 crond_t:fd use;
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')
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########################################
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## <summary>
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## Send a SIGCHLD signal to the cron daemon.
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## </summary>
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## <param name="domain">
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## Domain allowed access.
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## </param>
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#
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interface(`cron_sigchld',`
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gen_require(`
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type crond_t;
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class process sigchld;
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')
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allow $1 crond_t:process sigchld;
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')
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########################################
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## <summary>
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## Read a cron daemon unnamed pipe.
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## </summary>
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## <param name="domain">
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## Domain allowed access.
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## </param>
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#
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interface(`cron_read_pipe',`
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gen_require(`
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type crond_t;
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class file r_file_perms;
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')
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allow $1 crond_t:file r_file_perms;
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')
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########################################
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## <summary>
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## Read and write a cron daemon unnamed pipe.
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## </summary>
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## <param name="domain">
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## Domain allowed access.
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## </param>
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#
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interface(`cron_rw_pipe',`
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gen_require(`
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type crond_t;
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class file { read write };
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')
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allow $1 crond_t:file { read write };
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')
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########################################
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## <summary>
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## Search the directory containing user cron tables.
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## </summary>
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## <param name="domain">
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## The type of the process to performing this action.
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## </param>
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#
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interface(`cron_search_spool',`
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gen_require(`
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type cron_spool_t;
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class dir search;
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')
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files_search_spool($1)
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allow $1 cron_spool_t:dir search;
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')
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########################################
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## <summary>
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## Inherit and use a file descriptor
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## from system cron jobs.
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## </summary>
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## <param name="domain">
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## Domain allowed access.
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## </param>
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#
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interface(`cron_use_system_job_fd',`
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gen_require(`
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type system_crond_t;
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class fd use;
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')
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allow $1 system_crond_t:fd use;
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')
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########################################
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## <summary>
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## Wrate a system cron job unnamed pipe.
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## </summary>
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## <param name="domain">
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## Domain allowed access.
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## </param>
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#
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interface(`cron_write_system_job_pipe',`
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gen_require(`
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type system_crond_t;
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class file write;
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')
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allow $1 system_crond_t:file write;
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')
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########################################
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## <summary>
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## Read temporary files from the system cron jobs.
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## </summary>
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## <param name="domain">
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## Domain allowed access.
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## </param>
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#
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interface(`cron_read_system_job_tmp_files',`
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gen_require(`
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type system_crond_tmp_t;
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class file r_file_perms;
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')
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files_search_tmp($1)
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allow $1 system_crond_tmp_t:file r_file_perms;
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')
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