127 lines
4.1 KiB
Plaintext
127 lines
4.1 KiB
Plaintext
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#
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# Macros for crond domains.
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#
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#
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# Authors: Jonathan Crowley (MITRE) <jonathan@mitre.org>,
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# Stephen Smalley <sds@epoch.ncsc.mil> and Timothy Fraser
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# Russell Coker <rcoker@redhat.com>
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#
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#
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# crond_domain(domain_prefix)
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#
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# Define a derived domain for cron jobs executed by crond on behalf
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# of a user domain. These domains are separate from the top-level domain
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# defined for the crond daemon and the domain defined for system cron jobs,
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# which are specified in domains/program/crond.te.
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#
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undefine(`crond_domain')
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define(`crond_domain',`
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# Derived domain for user cron jobs, user user_crond_domain if not system
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ifelse(`system', `$1', `
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type $1_crond_t, domain, privlog, privmail, nscd_client_domain;
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', `
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type $1_crond_t, domain, user_crond_domain;
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# Access user files and dirs.
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allow $1_crond_t home_root_t:dir search;
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file_type_auto_trans($1_crond_t, $1_home_dir_t, $1_home_t)
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# Run scripts in user home directory and access shared libs.
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can_exec($1_crond_t, $1_home_t)
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file_type_auto_trans($1_crond_t, tmp_t, $1_tmp_t)
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')
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r_dir_file($1_crond_t, selinux_config_t)
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# Type of user crontabs once moved to cron spool.
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type $1_cron_spool_t, file_type, sysadmfile;
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ifdef(`fcron.te', `
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allow crond_t $1_cron_spool_t:file create_file_perms;
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')
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allow $1_crond_t urandom_device_t:chr_file { getattr read };
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allow $1_crond_t usr_t:file { getattr ioctl read };
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allow $1_crond_t usr_t:lnk_file read;
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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 execve_secure. 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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domain_trans(crond_t, shell_exec_t, $1_crond_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 { getattr read };
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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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# The user role is authorized for this domain.
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role $1_r types $1_crond_t;
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# This domain is granted permissions common to most domains.
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can_network($1_crond_t)
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allow $1_crond_t port_type:tcp_socket name_connect;
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can_ypbind($1_crond_t)
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r_dir_file($1_crond_t, self)
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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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allow $1_crond_t etc_runtime_t:file { getattr read };
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allow $1_crond_t self:process { fork signal_perms setsched };
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allow $1_crond_t proc_t:dir r_dir_perms;
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allow $1_crond_t proc_t:file { getattr read ioctl };
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read_locale($1_crond_t)
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read_sysctl($1_crond_t)
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allow $1_crond_t var_spool_t:dir search;
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allow $1_crond_t fs_type:filesystem getattr;
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allow $1_crond_t devtty_t:chr_file { read write };
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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 { getattr read ioctl };
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allow $1_crond_t var_log_t:dir search;
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# Use capabilities.
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allow $1_crond_t self:capability dac_override;
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# Inherit and use descriptors from initrc - I think this is wrong
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#allow $1_crond_t initrc_t:fd use;
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#
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# Since crontab files are not directly executed,
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# crond must ensure that the crontab file has
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# a type that is appropriate for the domain of
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# the user cron job. It performs an entrypoint
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# permission check for this purpose.
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#
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allow $1_crond_t $1_cron_spool_t:file entrypoint;
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# Run helper programs.
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can_exec_any($1_crond_t)
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# ps does not need to access /boot when run from cron
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dontaudit $1_crond_t boot_t:dir search;
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# quiet other ps operations
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dontaudit $1_crond_t domain:dir { getattr search };
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# for nscd
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dontaudit $1_crond_t var_run_t:dir search;
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')
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# When system_crond_t domain executes a type $1 executable then transition to
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# domain $2, allow $2 to interact with crond_t as well.
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define(`system_crond_entry', `
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ifdef(`crond.te', `
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domain_auto_trans(system_crond_t, $1, $2)
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allow $2 crond_t:fifo_file { getattr read write ioctl };
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# a rule for privfd may make this obsolete
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allow $2 crond_t:fd use;
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allow $2 crond_t:process sigchld;
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')dnl end ifdef
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')dnl end system_crond_entry
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