Default to SELinux private label for play kube mounts

Before, there were SELinux denials when a volume was bind-mounted by podman play kube.
Partially fix this by setting the default private label for mounts created by play kube (with DirectoryOrCreate)
For volumes mounted as Directory, the user will have to set their own SELinux permissions on the mount point

also remove left over debugging print statement

Signed-off-by: Peter Hunt <pehunt@redhat.com>

cmd/podman/play_kube.go

@@ -168,7 +168,13 @@ func playKubeYAMLCmd(c *cliconfig.KubePlayValues) error {
 						return errors.Errorf("Error creating HostPath %s at %s", volume.Name, hostPath.Path)
 					}
 				}
+				// unconditionally label a newly created volume as private
+				if err := libpod.LabelVolumePath(hostPath.Path, false); err != nil {
+					return errors.Wrapf(err, "Error giving %s a label", hostPath.Path)
+				}
+				break
 			case v1.HostPathDirectory:
+			case v1.HostPathUnset:
 				// do nothing here because we will verify the path exists in validateVolumeHostDir
 				break
 			default:
@@ -178,7 +184,6 @@ func playKubeYAMLCmd(c *cliconfig.KubePlayValues) error {
 		if err := shared.ValidateVolumeHostDir(hostPath.Path); err != nil {
 			return errors.Wrapf(err, "Error in parsing HostPath in YAML")
 		}
-		fmt.Println(volume.Name)
 		volumes[volume.Name] = hostPath.Path
 	}
 

docs/podman-play-kube.1.md

@@ -22,6 +22,8 @@ the ID of the new Pod is output.
 
 Ideally the input file would be one created by Podman (see podman-generate-kube(1)).  This would guarantee a smooth import and expected results.
 
+Note: HostPath volume types created by play kube will be given an SELinux private label (Z)
+
 # OPTIONS:
 
 **--authfile**

libpod/runtime_volume_linux.go

@@ -10,7 +10,6 @@ import (
 
 	"github.com/containers/libpod/libpod/events"
 	"github.com/containers/storage/pkg/stringid"
-	"github.com/opencontainers/selinux/go-selinux/label"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 )
@@ -56,15 +55,8 @@ func (r *Runtime) newVolume(ctx context.Context, options ...VolumeCreateOption)
 	if err := os.MkdirAll(fullVolPath, 0755); err != nil {
 		return nil, errors.Wrapf(err, "error creating volume directory %q", fullVolPath)
 	}
-	_, mountLabel, err := label.InitLabels([]string{})
-	if err != nil {
-		return nil, errors.Wrapf(err, "error getting default mountlabels")
-	}
-	if err := label.ReleaseLabel(mountLabel); err != nil {
-		return nil, errors.Wrapf(err, "error releasing label %q", mountLabel)
-	}
-	if err := label.Relabel(fullVolPath, mountLabel, true); err != nil {
-		return nil, errors.Wrapf(err, "error setting selinux label to %q", fullVolPath)
+	if err := LabelVolumePath(fullVolPath, true); err != nil {
+		return nil, err
 	}
 	volume.config.MountPoint = fullVolPath
 

libpod/util_linux.go

@@ -9,6 +9,7 @@ import (
 	"github.com/containerd/cgroups"
 	"github.com/containers/libpod/pkg/util"
 	spec "github.com/opencontainers/runtime-spec/specs-go"
+	"github.com/opencontainers/selinux/go-selinux/label"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 )
@@ -91,3 +92,23 @@ func GetV1CGroups(excludes []string) cgroups.Hierarchy {
 		return filtered, nil
 	}
 }
+
+// LabelVolumePath takes a mount path for a volume and gives it an
+// selinux label of either shared or not
+func LabelVolumePath(path string, shared bool) error {
+	_, mountLabel, err := label.InitLabels([]string{})
+	if err != nil {
+		return errors.Wrapf(err, "error getting default mountlabels")
+	}
+	if err := label.ReleaseLabel(mountLabel); err != nil {
+		return errors.Wrapf(err, "error releasing label %q", mountLabel)
+	}
+	if err := label.Relabel(path, mountLabel, shared); err != nil {
+		permString := "private"
+		if shared {
+			permString = "shared"
+		}
+		return errors.Wrapf(err, "error setting selinux label for %s to %q as %s", path, mountLabel, permString)
+	}
+	return nil
+}

libpod/util_unsupported.go

@@ -21,3 +21,9 @@ func deleteSystemdCgroup(path string) error {
 func assembleSystemdCgroupName(baseSlice, newSlice string) (string, error) {
 	return "", errors.Wrapf(ErrOSNotSupported, "cgroups are not supported on non-linux OSes")
 }
+
+// LabelVolumePath takes a mount path for a volume and gives it an
+// selinux label of either shared or not
+func LabelVolumePath(path string, shared bool) error {
+	return ErrNotImplemented
+}