Security-Enhanced Linux secures the uucpd processes via flexible mandatory access control.
The uucpd processes execute with the uucpd_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 uucpd_t
The uucpd_t SELinux type can be entered via the uucpd_exec_t file type.
The default entrypoint paths for the uucpd_t domain are the following:
You can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux uucpd policy is very flexible allowing users to setup their uucpd processes in as secure a method as possible.
The following process types are defined for uucpd:
uucpd_t
Note: semanage permissive -a uucpd_t can be used to make the process type uucpd_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated.
If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd server, you must turn on the authlogin_nsswitch_use_ldap boolean. Disabled by default.
setsebool -P authlogin_nsswitch_use_ldap 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 allow confined applications to run with kerberos, you must turn on the kerberos_enabled boolean. Enabled by default.
setsebool -P kerberos_enabled 1
If you want to allow system to run with NIS, you must turn on the nis_enabled boolean. Disabled by default.
setsebool -P nis_enabled 1
If you want to allow confined applications to use nscd shared memory, you must turn on the nscd_use_shm boolean. Enabled by default.
setsebool -P nscd_use_shm 1
You can see the types associated with a port by using the following command:
semanage port -l
Policy governs the access confined processes have to these ports. SELinux uucpd policy is very flexible allowing users to setup their uucpd processes in as secure a method as possible.
The following port types are defined for uucpd:
Default Defined Ports: tcp 540
The SELinux process type uucpd_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/pcsd(/.*)?
/var/lib/cluster(/.*)?
/var/lib/openais(/.*)?
/var/lib/pengine(/.*)?
/var/lib/corosync(/.*)?
/usr/lib/heartbeat(/.*)?
/var/lib/heartbeat(/.*)?
/var/lib/pacemaker(/.*)?
cluster_var_run_t
/var/run/crm(/.*)?
/var/run/cman_.*
/var/run/rsctmp(/.*)?
/var/run/aisexec.*
/var/run/heartbeat(/.*)?
/var/run/corosync-qnetd(/.*)?
/var/run/corosync-qdevice(/.*)?
/var/run/corosync.pid
/var/run/cpglockd.pid
/var/run/rgmanager.pid
/var/run/cluster/rgmanager.sk
root_t
/sysroot/ostree/deploy/.*-atomic/deploy(/.*)?
/
/initrd
uucpd_lock_t
/var/lock/uucp(/.*)?
uucpd_rw_t
uucpd_spool_t
/var/spool/uucp(/.*)?
/var/spool/uucppublic(/.*)?
uucpd_tmp_t
uucpd_var_run_t
You can see the context of a file using the -Z option to lsP Policy governs the access confined processes have to these files. SELinux uucpd policy is very flexible allowing users to setup their uucpd processes in as secure a method as possible.
EQUIVALENCE DIRECTORIES
uucpd policy stores data with multiple different file context types under the /var/spool/uucp directory. If you would like to store the data in a different directory you can use the semanage command to create an equivalence mapping. If you wanted to store this data under the /srv dirctory you would execute the following command:
semanage fcontext -a -e /var/spool/uucp /srv/uucp
restorecon -R -v /srv/uucp
STANDARD FILE CONTEXT
SELinux defines the file context types for the uucpd, if you wanted to store files with these types in a diffent paths, you need to execute the semanage command to sepecify alternate labeling and then use restorecon to put the labels on disk.
semanage fcontext -a -t uucpd_log_t '/srv/myuucpd_content(/.*)?'
restorecon -R -v /srv/myuucpd_content
Note: SELinux often uses regular expressions to specify labels that match multiple files.
The following file types are defined for uucpd:
uucpd_exec_t
- Set files with the uucpd_exec_t type, if you want to transition an executable to the uucpd_t domain.
uucpd_initrc_exec_t
- Set files with the uucpd_initrc_exec_t type, if you want to transition an executable to the uucpd_initrc_t domain.
uucpd_lock_t
- Set files with the uucpd_lock_t type, if you want to treat the files as uucpd lock data, stored under the /var/lock directory
uucpd_log_t
- Set files with the uucpd_log_t type, if you want to treat the data as uucpd log data, usually stored under the /var/log directory.
uucpd_ro_t
- Set files with the uucpd_ro_t type, if you want to treat the files as uucpd read/only content.
uucpd_rw_t
- Set files with the uucpd_rw_t type, if you want to treat the files as uucpd read/write content.
uucpd_spool_t
- Set files with the uucpd_spool_t type, if you want to store the uucpd files under the /var/spool directory.
uucpd_tmp_t
- Set files with the uucpd_tmp_t type, if you want to store uucpd temporary files in the /tmp directories.
uucpd_var_run_t
- Set files with the uucpd_var_run_t type, if you want to store the uucpd files under the /run or /var/run directory.
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.
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 port can also be used to manipulate the port definitions
semanage boolean can also be used to manipulate the booleans
system-config-selinux is a GUI tool available to customize SELinux policy settings.