+sub check_volume_access = sub {
+ my ($self, $user, $storecfg, $vmid, $volid) = @_;
+
+ # test if we have read access to volid
+
+ my $path;
+ if (my ($sid, $volname) = PVE::Storage::parse_volume_id($volid, 1)) {
+ my ($ownervm, $vtype);
+ ($path, $ownervm, $vtype) = PVE::Storage::path($storecfg, $volid);
+ if ($vtype eq 'iso' || $vtype eq 'vztmpl') {
+ # we simply allow access
+ } elsif (!$ownervm || ($ownervm != $vmid)) {
+ # allow if we are Datastore administrator
+ $self->check($user, "/storage/$sid", ['Datastore.Allocate']);
+ }
+ } else {
+ die "Only root can pass arbitrary filesystem paths."
+ if $user ne 'root@pam';
+
+ $path = abs_path($volid);
+ }
+ return $path;
+}
+