sandbox, ctr: SELinux fixes

server: fix selinux labels for pod and containers

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

sandbox: set selinux labels from request, not defaults

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

container_create: use sandbox's selinux if container's nil

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

sandbox: correctly init selinux labels

First, we weren't correctly initializing selinux labels. If any of
(level, user, role, type) was missing from kube selinux options, we
were erroring out. This is wrong as kube sends just `level=s0`
sometimes and docker itself allows `--security-opt label=level:s0`.
This patch directly initializes selinux labels, correctly, and adds a
test to verify it.

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

test: testdata: use container_runtime_t selinux type

RHEL SELinux policy doesn't have `container_t` type but we're using it
in our fixtures. That means Fedora integration tests pass because
`container_t` is in Fedora's container policy but RHEL is broken.
Fix it by using `container_runtime_t` which is aliased in Fedora policy
to `container_t`.

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

server/container_create.go

@@ -45,7 +45,7 @@ const (
 	defaultSystemdParent  = "system.slice"
 )
 
-func addOCIBindMounts(sb *sandbox.Sandbox, containerConfig *pb.ContainerConfig, specgen *generate.Generator) ([]oci.ContainerVolume, error) {
+func addOCIBindMounts(mountLabel string, containerConfig *pb.ContainerConfig, specgen *generate.Generator) ([]oci.ContainerVolume, error) {
 	volumes := []oci.ContainerVolume{}
 	mounts := containerConfig.GetMounts()
 	for _, mount := range mounts {
@@ -73,7 +73,7 @@ func addOCIBindMounts(sb *sandbox.Sandbox, containerConfig *pb.ContainerConfig,
 
 		if mount.SelinuxRelabel {
 			// Need a way in kubernetes to determine if the volume is shared or private
-			if err := label.Relabel(src, sb.MountLabel(), true); err != nil && err != unix.ENOTSUP {
+			if err := label.Relabel(src, mountLabel, true); err != nil && err != unix.ENOTSUP {
 				return nil, fmt.Errorf("relabel failed %s: %v", src, err)
 			}
 		}
@@ -519,7 +519,18 @@ func (s *Server) createSandboxContainer(ctx context.Context, containerID string,
 	specgen.HostSpecific = true
 	specgen.ClearProcessRlimits()
 
-	containerVolumes, err := addOCIBindMounts(sb, containerConfig, &specgen)
+	mountLabel := sb.MountLabel()
+	processLabel := sb.ProcessLabel()
+	selinuxConfig := containerConfig.GetLinux().GetSecurityContext().GetSelinuxOptions()
+	if selinuxConfig != nil {
+		var err error
+		processLabel, mountLabel, err = getSELinuxLabels(selinuxConfig)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	containerVolumes, err := addOCIBindMounts(mountLabel, containerConfig, &specgen)
 	if err != nil {
 		return nil, err
 	}
@@ -703,7 +714,7 @@ func (s *Server) createSandboxContainer(ctx context.Context, containerID string,
 					}
 				}
 			}
-			specgen.SetProcessSelinuxLabel(sb.ProcessLabel())
+			specgen.SetProcessSelinuxLabel(processLabel)
 		}
 
 		specgen.SetLinuxMountLabel(sb.MountLabel())
@@ -818,15 +829,18 @@ func (s *Server) createSandboxContainer(ctx context.Context, containerID string,
 		options = []string{"ro"}
 	}
 	if sb.ResolvPath() != "" {
-		// TODO: selinux
-		// label.Relabel(sb.ResolvPath(), container.MountLabel, shared)
+		if err := label.Relabel(sb.ResolvPath(), mountLabel, true); err != nil && err != unix.ENOTSUP {
+			return nil, err
+		}
 
 		// bind mount the pod resolver file
 		specgen.AddBindMount(sb.ResolvPath(), "/etc/resolv.conf", options)
 	}
 
 	if sb.HostnamePath() != "" {
-		// TODO: selinux
+		if err := label.Relabel(sb.HostnamePath(), mountLabel, true); err != nil && err != unix.ENOTSUP {
+			return nil, err
+		}
 
 		specgen.AddBindMount(sb.HostnamePath(), "/etc/hostname", options)
 	}
@@ -884,7 +898,7 @@ func (s *Server) createSandboxContainer(ctx context.Context, containerID string,
 		containerName, containerID,
 		metaname,
 		attempt,
-		sb.MountLabel(),
+		mountLabel,
 		nil)
 	if err != nil {
 		return nil, err
@@ -907,7 +921,7 @@ func (s *Server) createSandboxContainer(ctx context.Context, containerID string,
 	}
 
 	// Add image volumes
-	if err := addImageVolumes(mountPoint, s, &containerInfo, &specgen, sb.MountLabel()); err != nil {
+	if err := addImageVolumes(mountPoint, s, &containerInfo, &specgen, mountLabel); err != nil {
 		return nil, err
 	}
 

server/sandbox_run.go

@@ -203,8 +203,9 @@ func (s *Server) RunPodSandbox(ctx context.Context, req *pb.RunPodSandboxRequest
 			}
 			return nil, err
 		}
-		// TODO: selinux
-		// label.Relabel(sb.ResolvPath(), container.MountLabel, shared)
+		if err := label.Relabel(resolvPath, mountLabel, true); err != nil && err != unix.ENOTSUP {
+			return nil, err
+		}
 
 		g.AddBindMount(resolvPath, "/etc/resolv.conf", []string{"ro"})
 	}
@@ -248,7 +249,7 @@ func (s *Server) RunPodSandbox(ctx context.Context, req *pb.RunPodSandboxRequest
 
 	// Don't use SELinux separation with Host Pid or IPC Namespace,
 	if !req.GetConfig().GetLinux().GetSecurityContext().GetNamespaceOptions().HostPid && !req.GetConfig().GetLinux().GetSecurityContext().GetNamespaceOptions().HostIpc {
-		processLabel, mountLabel, err = getSELinuxLabels(nil)
+		processLabel, mountLabel, err = getSELinuxLabels(req.GetConfig().GetLinux().GetSecurityContext().GetSelinuxOptions())
 		if err != nil {
 			return nil, err
 		}
@@ -464,7 +465,9 @@ func (s *Server) RunPodSandbox(ctx context.Context, req *pb.RunPodSandboxRequest
 	if err := ioutil.WriteFile(hostnamePath, []byte(hostname+"\n"), 0644); err != nil {
 		return nil, err
 	}
-	// TODO: selinux relabel
+	if err := label.Relabel(hostnamePath, mountLabel, true); err != nil && err != unix.ENOTSUP {
+		return nil, err
+	}
 	g.AddBindMount(hostnamePath, "/etc/hostname", []string{"ro"})
 	g.AddAnnotation(annotations.HostnamePath, hostnamePath)
 	sb.AddHostnamePath(hostnamePath)
@@ -555,30 +558,22 @@ func (s *Server) setPodSandboxMountLabel(id, mountLabel string) error {
 }
 
 func getSELinuxLabels(selinuxOptions *pb.SELinuxOption) (processLabel string, mountLabel string, err error) {
-	processLabel = ""
+	labels := []string{}
 	if selinuxOptions != nil {
-		user := selinuxOptions.User
-		if user == "" {
-			return "", "", fmt.Errorf("SELinuxOption.User is empty")
+		if selinuxOptions.User != "" {
+			labels = append(labels, "user:"+selinuxOptions.User)
 		}
-
-		role := selinuxOptions.Role
-		if role == "" {
-			return "", "", fmt.Errorf("SELinuxOption.Role is empty")
+		if selinuxOptions.Role != "" {
+			labels = append(labels, "role:"+selinuxOptions.Role)
 		}
-
-		t := selinuxOptions.Type
-		if t == "" {
-			return "", "", fmt.Errorf("SELinuxOption.Type is empty")
+		if selinuxOptions.Type != "" {
+			labels = append(labels, "type:"+selinuxOptions.Type)
 		}
-
-		level := selinuxOptions.Level
-		if level == "" {
-			return "", "", fmt.Errorf("SELinuxOption.Level is empty")
+		if selinuxOptions.Level != "" {
+			labels = append(labels, "level:"+selinuxOptions.Level)
 		}
-		processLabel = fmt.Sprintf("%s:%s:%s:%s", user, role, t, level)
 	}
-	return label.InitLabels(label.DupSecOpt(processLabel))
+	return label.InitLabels(labels)
 }
 
 func setupShm(podSandboxRunDir, mountLabel string) (shmPath string, err error) {

test/selinux.bats

@@ -0,0 +1,26 @@
+#!/usr/bin/env bats
+
+load helpers
+
+function teardown() {
+	cleanup_test
+}
+
+@test "ctr termination reason Completed" {
+	start_crio
+	run crioctl pod run --config "$TESTDATA"/sandbox_config_selinux.json
+	echo "$output"
+	[ "$status" -eq 0 ]
+	pod_id="$output"
+	run crioctl ctr create --config "$TESTDATA"/container_redis.json --pod "$pod_id"
+	echo "$output"
+	[ "$status" -eq 0 ]
+	ctr_id="$output"
+	run crioctl ctr start --id "$ctr_id"
+	echo "$output"
+	[ "$status" -eq 0 ]
+
+	cleanup_ctrs
+	cleanup_pods
+	stop_crio
+}

test/testdata/container_config.json

@@ -51,6 +51,12 @@
 		},
 		"security_context": {
 			"readonly_rootfs": false,
+			"selinux_options": {
+				"user": "system_u",
+				"role": "system_r",
+				"type": "svirt_lxc_net_t",
+				"level": "s0:c4,c5"
+			},
 			"capabilities": {
 				"add_capabilities": [
 					"setuid",
@@ -58,12 +64,6 @@
 				],
 				"drop_capabilities": [
 				]
-			},
-			"selinux_options": {
-				"user": "system_u",
-				"role": "system_r",
-				"type": "container_t",
-				"level": "s0:c4,c5"
 			}
 		}
 	}

test/testdata/container_config_by_imageid.json

@@ -62,7 +62,7 @@
 			"selinux_options": {
 				"user": "system_u",
 				"role": "system_r",
-				"type": "container_t",
+				"type": "svirt_lxc_net_t",
 				"level": "s0:c4,c5"
 			}
 		}

test/testdata/container_config_hostport.json

@@ -64,7 +64,7 @@
 			"selinux_options": {
 				"user": "system_u",
 				"role": "system_r",
-				"type": "container_t",
+				"type": "svirt_lxc_net_t",
 				"level": "s0:c4,c5"
 			}
 		}

test/testdata/container_config_logging.json

@@ -64,7 +64,7 @@
 			"selinux_options": {
 				"user": "system_u",
 				"role": "system_r",
-				"type": "container_t",
+				"type": "svirt_lxc_net_t",
 				"level": "s0:c4,c5"
 			}
 		}

test/testdata/container_config_resolvconf.json

@@ -64,7 +64,7 @@
 			"selinux_options": {
 				"user": "system_u",
 				"role": "system_r",
-				"type": "container_t",
+				"type": "svirt_lxc_net_t",
 				"level": "s0:c4,c5"
 			}
 		}

test/testdata/container_config_resolvconf_ro.json

@@ -64,7 +64,7 @@
 			"selinux_options": {
 				"user": "system_u",
 				"role": "system_r",
-				"type": "container_t",
+				"type": "svirt_lxc_net_t",
 				"level": "s0:c4,c5"
 			}
 		}

test/testdata/container_config_seccomp.json

@@ -65,7 +65,7 @@
 				"user": "system_u",
 				"role": "system_r",
 				"type": "svirt_lxc_net_t",
-				"level": "s0:c4-c5"
+				"level": "s0:c4,c5"
 			}
 		}
 	}

test/testdata/sandbox_config.json

@@ -39,6 +39,12 @@
 				"host_network": false,
 				"host_pid": false,
 				"host_ipc": false
+			},
+			"selinux_options": {
+				"user": "system_u",
+				"role": "system_r",
+				"type": "svirt_lxc_net_t",
+				"level": "s0:c4,c5"
 			}
 		}
 	}

test/testdata/sandbox_config_seccomp.json

@@ -41,13 +41,13 @@
 				"host_network": false,
 				"host_pid": false,
 				"host_ipc": false
+			},
+			"selinux_options": {
+				"user": "system_u",
+				"role": "system_r",
+				"type": "svirt_lxc_net_t",
+				"level": "s0:c4,c5"
 			}
-		},
-		"selinux_options": {
-			"user": "system_u",
-			"role": "system_r",
-			"type": "container_t",
-			"level": "s0:c1,c2"
 		}
 	}
 }

test/testdata/sandbox_config_selinux.json

@@ -0,0 +1,48 @@
+{
+	"metadata": {
+		"name": "podsandbox1",
+		"uid": "redhat-test-crio",
+		"namespace": "redhat.test.crio",
+		"attempt": 1
+	},
+	"hostname": "crioctl_host",
+	"log_directory": "",
+	"dns_config": {
+		"searches": [
+			"8.8.8.8"
+		]
+	},
+	"port_mappings": [],
+	"resources": {
+		"cpu": {
+			"limits": 3,
+			"requests": 2
+		},
+		"memory": {
+			"limits": 50000000,
+			"requests": 2000000
+		}
+	},
+	"labels": {
+		"group": "test"
+	},
+	"annotations": {
+		"owner": "hmeng",
+		"security.alpha.kubernetes.io/sysctls": "kernel.shm_rmid_forced=1,net.ipv4.ip_local_port_range=1024 65000",
+		"security.alpha.kubernetes.io/unsafe-sysctls": "kernel.msgmax=8192" ,
+		"security.alpha.kubernetes.io/seccomp/pod": "unconfined"
+	},
+	"linux": {
+		"cgroup_parent": "/Burstable/pod_123-456",
+		"security_context": {
+			"namespace_options": {
+				"host_network": false,
+				"host_pid": false,
+				"host_ipc": false
+			},
+			"selinux_options": {
+				"level": "s0"
+			}
+		}
+	}
+}