virsh_selinux(8) SELinux Policy virsh virsh_selinux(8)
virsh_selinux - Security Enhanced Linux Policy for the virsh processes
Security-Enhanced Linux secures the virsh processes via flexible mandatory access control.
The virsh processes execute with the virsh_t SELinux type. You can check if you have these processes running by executing the ps command
with the -Z qualifier.
ps -eZ | grep virsh_t
The virsh_t SELinux type can be entered via the virsh_exec_t file type.
The default entrypoint paths for the virsh_t domain are the following:
/usr/sbin/xl, /usr/sbin/xm, /usr/bin/virsh
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 virsh policy is very flexible allowing users to setup their virsh pro-
cesses in as secure a method as possible.
The following process types are defined for virsh:
Note: semanage permissive -a virsh_t can be used to make the process type virsh_t permissive. SELinux does not deny access to permissive
process types, but the AVC (SELinux denials) messages are still generated.
SELinux policy is customizable based on least access required. virsh policy is extremely flexible and has several booleans that allow you
to manipulate the policy and run virsh with the tightest access possible.
If you want to allow all daemons the ability to read/write terminals, you must turn on the daemons_use_tty boolean. Disabled by default.
setsebool -P daemons_use_tty 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
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
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 use nscd shared memory, you must turn on the nscd_use_shm boolean. Enabled 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 allow confined virtual guests to manage nfs files, you must turn on the virt_use_nfs boolean. Disabled by default.
setsebool -P virt_use_nfs 1
If you want to allow confined virtual guests to manage cifs files, you must turn on the virt_use_samba boolean. Disabled by default.
setsebool -P virt_use_samba 1
If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd server for the virsh_ssh_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 virsh_ssh_t, you must turn on the kerberos_enabled boolean.
setsebool -P kerberos_enabled 1
The SELinux process type virsh_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.
all virtual image files
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 virsh policy is very flexible allowing users to setup their
virsh processes in as secure a method as possible.
STANDARD FILE CONTEXT
SELinux defines the file context types for the virsh, 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 virsh_exec_t '/srv/virsh/content(/.*)?'
restorecon -R -v /srv/myvirsh_content
Note: SELinux often uses regular expressions to specify labels that match multiple files.
The following file types are defined for virsh:
- Set files with the virsh_exec_t type, if you want to transition an executable to the virsh_t domain.
/usr/sbin/xl, /usr/sbin/xm, /usr/bin/virsh
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 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.
This manual page was auto-generated using sepolicy manpage .
selinux(8), virsh(8), semanage(8), restorecon(8), chcon(1), sepolicy(8) , setsebool(8), virsh_ssh_selinux(8), virsh_ssh_selinux(8)
virsh 14-06-10 virsh_selinux(8)