Add support for selecting kvm and systemd labels

In order to better support kata containers and systemd containers
container-selinux has added new types. Podman should execute the
container with an SELinux process label to match the container type.

Traditional Container process : container_t
KVM Container Process: containre_kvm_t
PID 1 Init process: container_init_t

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/pkg/util/utils.go b/pkg/util/utils.go
index 1051ed311..2500693d7 100644
--- a/pkg/util/utils.go
+++ b/pkg/util/utils.go
@@ -22,6 +22,7 @@ import (
 	"github.com/containers/storage"
 	"github.com/containers/storage/pkg/idtools"
 	v1 "github.com/opencontainers/image-spec/specs-go/v1"
+	"github.com/opencontainers/selinux/go-selinux"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 	"github.com/spf13/pflag"
@@ -666,3 +667,38 @@ func ValidateSysctls(strSlice []string) (map[string]string, error) {
 	}
 	return sysctl, nil
 }
+
+// SELinuxKVMLabel returns labels for running kvm isolated containers
+func SELinuxKVMLabel(cLabel string) (string, error) {
+	if cLabel == "" {
+		// selinux is disabled
+		return "", nil
+	}
+	processLabel, _ := selinux.KVMContainerLabels()
+	selinux.ReleaseLabel(processLabel)
+	return swapSELinuxLabel(cLabel, processLabel)
+}
+
+// SELinuxInitLabel returns labels for running systemd based containers
+func SELinuxInitLabel(cLabel string) (string, error) {
+	if cLabel == "" {
+		// selinux is disabled
+		return "", nil
+	}
+	processLabel, _ := selinux.InitContainerLabels()
+	selinux.ReleaseLabel(processLabel)
+	return swapSELinuxLabel(cLabel, processLabel)
+}
+
+func swapSELinuxLabel(cLabel, processLabel string) (string, error) {
+	dcon, err := selinux.NewContext(cLabel)
+	if err != nil {
+		return "", err
+	}
+	scon, err := selinux.NewContext(processLabel)
+	if err != nil {
+		return "", err
+	}
+	dcon["type"] = scon["type"]
+	return dcon.Get(), nil
+}