NAME¶

courier_tcpd_selinux - Security Enhanced Linux Policy for the courier_tcpd processes

DESCRIPTION¶

Security-Enhanced Linux secures the courier_tcpd processes via flexible mandatory access control.

The courier_tcpd processes execute with the courier_tcpd_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier.

For example:

ps -eZ | grep courier_tcpd_t

ENTRYPOINTS¶

The courier_tcpd_t SELinux type can be entered via the courier_tcpd_exec_t file type.

The default entrypoint paths for the courier_tcpd_t domain are the following:

/usr/lib(64)?/courier/couriertcpd, /usr/sbin/couriertcpd

PROCESS TYPES¶

SELinux defines process types (domains) for each process running on the system

You can see the context of a process using the -Z option to ps

Policy governs the access confined processes have to files. SELinux courier_tcpd policy is very flexible allowing users to setup their courier_tcpd processes in as secure a method as possible.

The following process types are defined for courier_tcpd:

courier_tcpd_t

Note: semanage permissive -a courier_tcpd_t can be used to make the process type courier_tcpd_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated.

BOOLEANS¶

SELinux policy is customizable based on least access required. courier_tcpd policy is extremely flexible and has several booleans that allow you to manipulate the policy and run courier_tcpd with the tightest access possible.

If you want to allow all daemons to write corefiles to /, you must turn on the allow_daemons_dump_core boolean. Disabled by default.

setsebool -P allow_daemons_dump_core 1

If you want to allow all daemons to use tcp wrappers, you must turn on the allow_daemons_use_tcp_wrapper boolean. Disabled by default.

setsebool -P allow_daemons_use_tcp_wrapper 1

If you want to allow all daemons the ability to read/write terminals, you must turn on the allow_daemons_use_tty boolean. Disabled by default.

setsebool -P allow_daemons_use_tty 1

If you want to allow all domains to use other domains file descriptors, you must turn on the allow_domain_fd_use boolean. Enabled by default.

setsebool -P allow_domain_fd_use 1

If you want to allow sysadm to debug or ptrace all processes, you must turn on the allow_ptrace boolean. Disabled by default.

setsebool -P allow_ptrace 1

If you want to enable cluster mode for daemons, you must turn on the daemons_enable_cluster_mode boolean. Disabled by default.

setsebool -P daemons_enable_cluster_mode 1

If you want to allow all domains to have the kernel load modules, you must turn on the domain_kernel_load_modules boolean. Disabled by default.

setsebool -P domain_kernel_load_modules 1

If you want to allow all domains to execute in fips_mode, you must turn on the fips_mode boolean. Enabled by default.

setsebool -P fips_mode 1

If you want to enable reading of urandom for all domains, you must turn on the global_ssp boolean. Disabled by default.

setsebool -P global_ssp 1

If you want to enable support for upstart as the init program, you must turn on the init_upstart boolean. Enabled by default.

setsebool -P init_upstart 1

MANAGED FILES¶

The SELinux process type courier_tcpd_t can manage files labeled with the following file types. The paths listed are the default paths for these file types. Note the processes UID still need to have DAC permissions.

cluster_conf_t

/etc/cluster(/.*)?

cluster_var_lib_t

/var/lib(64)?/openais(/.*)?
/var/lib(64)?/pengine(/.*)?
/var/lib(64)?/corosync(/.*)?
/usr/lib(64)?/heartbeat(/.*)?
/var/lib(64)?/heartbeat(/.*)?
/var/lib(64)?/pacemaker(/.*)?
/var/lib/cluster(/.*)?

cluster_var_run_t

/var/run/crm(/.*)?
/var/run/cman_.*
/var/run/rsctmp(/.*)?
/var/run/aisexec.*
/var/run/heartbeat(/.*)?
/var/run/cpglockd.pid
/var/run/corosync.pid
/var/run/rgmanager.pid
/var/run/cluster/rgmanager.sk

courier_spool_t

/var/spool/courier(/.*)?
/var/spool/authdaemon(/.*)?

courier_var_lib_t

/var/lib/courier(/.*)?

courier_var_run_t

/var/run/courier(/.*)?

initrc_tmp_t

mnt_t

/mnt(/[^/]*)
/mnt(/[^/]*)?
/rhev(/[^/]*)?
/media(/[^/]*)
/media(/[^/]*)?
/etc/rhgb(/.*)?
/media/.hal-.*
/net
/afs
/rhev
/misc

root_t

/
/initrd

tmp_t

/tmp
/usr/tmp
/var/tmp
/tmp-inst
/var/tmp-inst
/var/tmp/vi.recover

FILE CONTEXTS¶

SELinux requires files to have an extended attribute to define the file type.

You can see the context of a file using the -Z option to ls

Policy governs the access confined processes have to these files. SELinux courier_tcpd policy is very flexible allowing users to setup their courier_tcpd processes in as secure a method as possible.

The following file types are defined for courier_tcpd:

courier_tcpd_exec_t

- Set files with the courier_tcpd_exec_t type, if you want to transition an executable to the courier_tcpd_t domain.

Paths:

/usr/lib(64)?/courier/couriertcpd, /usr/sbin/couriertcpd

Note: File context can be temporarily modified with the chcon command. If you want to permanently change the file context you need to use the semanage fcontext command. This will modify the SELinux labeling database. You will need to use restorecon to apply the labels.

COMMANDS¶

semanage fcontext can also be used to manipulate default file context mappings.

semanage permissive can also be used to manipulate whether or not a process type is permissive.

semanage module can also be used to enable/disable/install/remove policy modules.

semanage boolean can also be used to manipulate the booleans

system-config-selinux is a GUI tool available to customize SELinux policy settings.

AUTHOR¶

This manual page was auto-generated using sepolicy manpage .

SEE ALSO¶

selinux(8), courier_tcpd(8), semanage(8), restorecon(8), chcon(1) , setsebool(8)