lpr_selinux(8) SELinux Policy lpr lpr_selinux(8)
NAME
lpr_selinux - Security Enhanced Linux Policy for the lpr processes
DESCRIPTION
Security-Enhanced Linux secures the lpr processes via flexible mandatory access control.
The lpr processes execute with the lpr_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 lpr_t
ENTRYPOINTS
The lpr_t SELinux type can be entered via the lpr_exec_t file type.
The default entrypoint paths for the lpr_t domain are the following:
/usr/bin/lp(.cups)?, /usr/bin/lpq(.cups)?, /usr/bin/lpr(.cups)?, /usr/bin/lprm(.cups)?, /usr/sbin/lpc(.cups)?, /usr/bin/cancel(.cups)?,
/usr/bin/lpstat(.cups)?, /opt/gutenprint/bin(/.*)?, /opt/gutenprint/sbin(/.*)?, /usr/linuxprinter/bin/l?lpr, /usr/local/linux-
printer/bin/l?lpr, /usr/sbin/accept, /usr/sbin/lpinfo, /usr/sbin/lpmove, /usr/sbin/lpadmin, /usr/bin/lpoptions
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 lpr policy is very flexible allowing users to setup their lpr pro-
cesses in as secure a method as possible.
The following process types are defined for lpr:
lpr_t
Note: semanage permissive -a lpr_t can be used to make the process type lpr_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. lpr policy is extremely flexible and has several booleans that allow you to
manipulate the policy and run lpr with the tightest access possible.
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 authlo-
gin_nsswitch_use_ldap boolean. Disabled by default.
setsebool -P authlogin_nsswitch_use_ldap 1
If you want to deny any process from ptracing or debugging any other processes, you must turn on the deny_ptrace boolean. Enabled by
default.
setsebool -P deny_ptrace 1
If you want to allow all domains to use other domains file descriptors, you must turn on the domain_fd_use boolean. Enabled by default.
setsebool -P domain_fd_use 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 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. Disabled by default.
setsebool -P nscd_use_shm 1
If you want to support ecryptfs home directories, you must turn on the use_ecryptfs_home_dirs boolean. Disabled by default.
setsebool -P use_ecryptfs_home_dirs 1
If you want to support fusefs home directories, you must turn on the use_fusefs_home_dirs boolean. Disabled by default.
setsebool -P use_fusefs_home_dirs 1
If you want to determine whether to support lpd server, you must turn on the use_lpd_server boolean. Disabled by default.
setsebool -P use_lpd_server 1
If you want to support NFS home directories, you must turn on the use_nfs_home_dirs boolean. Disabled by default.
setsebool -P use_nfs_home_dirs 1
If you want to support SAMBA home directories, you must turn on the use_samba_home_dirs boolean. Disabled by default.
setsebool -P use_samba_home_dirs 1
NSSWITCH DOMAIN
If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd server for the lpr_t, you must turn
on the authlogin_nsswitch_use_ldap boolean.
setsebool -P authlogin_nsswitch_use_ldap 1
If you want to allow confined applications to run with kerberos for the lpr_t, you must turn on the kerberos_enabled boolean.
setsebool -P kerberos_enabled 1
MANAGED FILES
The SELinux process type lpr_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.
lpr_tmp_t
print_spool_t
/var/spool/lpd(/.*)?
/var/spool/cups(/.*)?
/var/spool/cups-pdf(/.*)?
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 lpr policy is very flexible allowing users to setup their lpr
processes in as secure a method as possible.
STANDARD FILE CONTEXT
SELinux defines the file context types for the lpr, 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 lpr_exec_t '/srv/lpr/content(/.*)?'
restorecon -R -v /srv/mylpr_content
Note: SELinux often uses regular expressions to specify labels that match multiple files.
The following file types are defined for lpr:
lpr_exec_t
- Set files with the lpr_exec_t type, if you want to transition an executable to the lpr_t domain.
Paths:
/usr/bin/lp(.cups)?, /usr/bin/lpq(.cups)?, /usr/bin/lpr(.cups)?, /usr/bin/lprm(.cups)?, /usr/sbin/lpc(.cups)?, /usr/bin/can-
cel(.cups)?, /usr/bin/lpstat(.cups)?, /opt/gutenprint/bin(/.*)?, /opt/gutenprint/sbin(/.*)?, /usr/linuxprinter/bin/l?lpr,
/usr/local/linuxprinter/bin/l?lpr, /usr/sbin/accept, /usr/sbin/lpinfo, /usr/sbin/lpmove, /usr/sbin/lpadmin, /usr/bin/lpoptions
lpr_tmp_t
- Set files with the lpr_tmp_t type, if you want to store lpr temporary files in the /tmp directories.
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), lpr(8), semanage(8), restorecon(8), chcon(1), sepolicy(8) , setsebool(8)
lpr 14-06-10 lpr_selinux(8)