Switch to using opencontainers/selinux for selinux bindings

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

container/container.go

@@ -43,7 +43,7 @@ import (
 	"github.com/docker/libnetwork/options"
 	"github.com/docker/libnetwork/types"
 	agentexec "github.com/docker/swarmkit/agent/exec"
-	"github.com/opencontainers/runc/libcontainer/label"
+	"github.com/opencontainers/selinux/go-selinux/label"
 )
 
 const configFileName = "config.v2.json"

container/container_unix.go

@@ -17,7 +17,7 @@ import (
 	"github.com/docker/docker/pkg/symlink"
 	"github.com/docker/docker/pkg/system"
 	"github.com/docker/docker/volume"
-	"github.com/opencontainers/runc/libcontainer/label"
+	"github.com/opencontainers/selinux/go-selinux/label"
 	"golang.org/x/sys/unix"
 )
 

daemon/container_operations_unix.go

@@ -19,7 +19,7 @@ import (
 	"github.com/docker/docker/pkg/stringid"
 	"github.com/docker/docker/runconfig"
 	"github.com/docker/libnetwork"
-	"github.com/opencontainers/runc/libcontainer/label"
+	"github.com/opencontainers/selinux/go-selinux/label"
 	"github.com/pkg/errors"
 )
 

daemon/create.go

@@ -20,7 +20,7 @@ import (
 	"github.com/docker/docker/pkg/idtools"
 	"github.com/docker/docker/pkg/stringid"
 	"github.com/docker/docker/runconfig"
-	"github.com/opencontainers/runc/libcontainer/label"
+	"github.com/opencontainers/selinux/go-selinux/label"
 )
 
 // CreateManagedContainer creates a container that is managed by a Service
@@ -155,6 +155,13 @@ func (daemon *Daemon) create(params types.ContainerCreateConfig, managed bool) (
 	return container, nil
 }
 
+func toHostConfigSelinuxLabels(labels []string) []string {
+	for i, l := range labels {
+		labels[i] = "label=" + l
+	}
+	return labels
+}
+
 func (daemon *Daemon) generateSecurityOpt(hostConfig *containertypes.HostConfig) ([]string, error) {
 	for _, opt := range hostConfig.SecurityOpt {
 		con := strings.Split(opt, "=")
@@ -167,7 +174,7 @@ func (daemon *Daemon) generateSecurityOpt(hostConfig *containertypes.HostConfig)
 	pidMode := hostConfig.PidMode
 	privileged := hostConfig.Privileged
 	if ipcMode.IsHost() || pidMode.IsHost() || privileged {
-		return label.DisableSecOpt(), nil
+		return toHostConfigSelinuxLabels(label.DisableSecOpt()), nil
 	}
 
 	var ipcLabel []string
@@ -181,7 +188,7 @@ func (daemon *Daemon) generateSecurityOpt(hostConfig *containertypes.HostConfig)
 		}
 		ipcLabel = label.DupSecOpt(c.ProcessLabel)
 		if pidContainer == "" {
-			return ipcLabel, err
+			return toHostConfigSelinuxLabels(ipcLabel), err
 		}
 	}
 	if pidContainer != "" {
@@ -192,7 +199,7 @@ func (daemon *Daemon) generateSecurityOpt(hostConfig *containertypes.HostConfig)
 
 		pidLabel = label.DupSecOpt(c.ProcessLabel)
 		if ipcContainer == "" {
-			return pidLabel, err
+			return toHostConfigSelinuxLabels(pidLabel), err
 		}
 	}
 
@@ -202,7 +209,7 @@ func (daemon *Daemon) generateSecurityOpt(hostConfig *containertypes.HostConfig)
 				return nil, fmt.Errorf("--ipc and --pid containers SELinux labels aren't the same")
 			}
 		}
-		return pidLabel, nil
+		return toHostConfigSelinuxLabels(pidLabel), nil
 	}
 	return nil, nil
 }

daemon/create_unix.go

@@ -12,7 +12,7 @@ import (
 	mounttypes "github.com/docker/docker/api/types/mount"
 	"github.com/docker/docker/container"
 	"github.com/docker/docker/pkg/stringid"
-	"github.com/opencontainers/runc/libcontainer/label"
+	"github.com/opencontainers/selinux/go-selinux/label"
 )
 
 // createContainerPlatformSpecificSettings performs platform specific container create functionality

daemon/daemon_solaris.go

@@ -23,8 +23,8 @@ import (
 	"github.com/docker/libnetwork/netlabel"
 	"github.com/docker/libnetwork/netutils"
 	lntypes "github.com/docker/libnetwork/types"
-	"github.com/opencontainers/runc/libcontainer/label"
 	"github.com/opencontainers/runtime-spec/specs-go"
+	"github.com/opencontainers/selinux/go-selinux/label"
 	"github.com/pkg/errors"
 )
 

daemon/daemon_unix.go

@@ -41,9 +41,9 @@ import (
 	lntypes "github.com/docker/libnetwork/types"
 	"github.com/golang/protobuf/ptypes"
 	"github.com/opencontainers/runc/libcontainer/cgroups"
-	"github.com/opencontainers/runc/libcontainer/label"
 	rsystem "github.com/opencontainers/runc/libcontainer/system"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
+	"github.com/opencontainers/selinux/go-selinux/label"
 	"github.com/pkg/errors"
 	"github.com/vishvananda/netlink"
 )

daemon/graphdriver/aufs/aufs.go

@@ -47,8 +47,8 @@ import (
 	"github.com/docker/docker/pkg/locker"
 	mountpk "github.com/docker/docker/pkg/mount"
 
-	"github.com/opencontainers/runc/libcontainer/label"
 	rsystem "github.com/opencontainers/runc/libcontainer/system"
+	"github.com/opencontainers/selinux/go-selinux/label"
 )
 
 var (

daemon/graphdriver/btrfs/btrfs.go

@@ -28,7 +28,7 @@ import (
 	"github.com/docker/docker/pkg/mount"
 	"github.com/docker/docker/pkg/parsers"
 	"github.com/docker/go-units"
-	"github.com/opencontainers/runc/libcontainer/label"
+	"github.com/opencontainers/selinux/go-selinux/label"
 )
 
 func init() {

daemon/graphdriver/devmapper/deviceset.go

@@ -30,7 +30,7 @@ import (
 	"github.com/docker/docker/pkg/parsers"
 	units "github.com/docker/go-units"
 
-	"github.com/opencontainers/runc/libcontainer/label"
+	"github.com/opencontainers/selinux/go-selinux/label"
 )
 
 var (

daemon/graphdriver/overlay/overlay.go

@@ -21,7 +21,7 @@ import (
 	"github.com/docker/docker/pkg/idtools"
 	"github.com/docker/docker/pkg/locker"
 	"github.com/docker/docker/pkg/mount"
-	"github.com/opencontainers/runc/libcontainer/label"
+	"github.com/opencontainers/selinux/go-selinux/label"
 )
 
 // This is a small wrapper over the NaiveDiffWriter that lets us have a custom

daemon/graphdriver/overlay2/overlay.go

@@ -33,7 +33,7 @@ import (
 	"github.com/docker/docker/pkg/parsers/kernel"
 	units "github.com/docker/go-units"
 
-	"github.com/opencontainers/runc/libcontainer/label"
+	"github.com/opencontainers/selinux/go-selinux/label"
 )
 
 var (

daemon/graphdriver/vfs/driver.go

@@ -9,7 +9,7 @@ import (
 	"github.com/docker/docker/pkg/chrootarchive"
 	"github.com/docker/docker/pkg/idtools"
 
-	"github.com/opencontainers/runc/libcontainer/label"
+	"github.com/opencontainers/selinux/go-selinux/label"
 )
 
 var (

daemon/graphdriver/zfs/zfs.go

@@ -19,7 +19,7 @@ import (
 	"github.com/docker/docker/pkg/mount"
 	"github.com/docker/docker/pkg/parsers"
 	zfs "github.com/mistifyio/go-zfs"
-	"github.com/opencontainers/runc/libcontainer/label"
+	"github.com/opencontainers/selinux/go-selinux/label"
 )
 
 type zfsOptions struct {

daemon/selinux_linux.go

@@ -2,16 +2,16 @@
 
 package daemon
 
-import "github.com/opencontainers/runc/libcontainer/selinux"
+import "github.com/opencontainers/selinux/go-selinux"
 
 func selinuxSetDisabled() {
 	selinux.SetDisabled()
 }
 
 func selinuxFreeLxcContexts(label string) {
-	selinux.FreeLxcContexts(label)
+	selinux.ReleaseLabel(label)
 }
 
 func selinuxEnabled() bool {
-	return selinux.SelinuxEnabled()
+	return selinux.GetEnabled()
 }

vendor.conf

@@ -142,3 +142,4 @@ github.com/xeipuuv/gojsonpointer e0fe6f68307607d540ed8eac07a342c33fa1b54a
 github.com/xeipuuv/gojsonreference e02fc20de94c78484cd5ffb007f8af96be030a45
 github.com/xeipuuv/gojsonschema 93e72a773fade158921402d6a24c819b48aba29d
 gopkg.in/yaml.v2 4c78c975fe7c825c6d1466c42be594d1d6f3aba6
+github.com/opencontainers/selinux ba1aefe8057f1d0cfb8e88d0ec1dc85925ef987d

vendor/github.com/opencontainers/selinux/LICENSE

@@ -0,0 +1,201 @@
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+                        http://www.apache.org/licenses/
+
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vendor/github.com/opencontainers/selinux/README.md

@@ -0,0 +1,7 @@
+# selinux
+
+[![GoDoc](https://godoc.org/github.com/opencontainers/selinux?status.svg)](https://godoc.org/github.com/opencontainers/selinux) [![Go Report Card](https://goreportcard.com/badge/github.com/opencontainers/selinux)](https://goreportcard.com/report/github.com/opencontainers/selinux) [![Build Status](https://travis-ci.org/opencontainers/selinux.svg?branch=master)](https://travis-ci.org/opencontainers/selinux)
+
+Common SELinux package used across the container ecosystem.
+
+Please see the [godoc](https://godoc.org/github.com/opencontainers/selinux) for more information.

vendor/github.com/opencontainers/runc/libcontainer/label/label.go → vendor/github.com/opencontainers/selinux/go-selinux/label/label.go

@@ -52,7 +52,7 @@ func ReserveLabel(label string) error {
 	return nil
 }
 
-func UnreserveLabel(label string) error {
+func ReleaseLabel(label string) error {
 	return nil
 }
 

vendor/github.com/opencontainers/runc/libcontainer/label/label_selinux.go → vendor/github.com/opencontainers/selinux/go-selinux/label/label_selinux.go

@@ -6,7 +6,7 @@ import (
 	"fmt"
 	"strings"
 
-	"github.com/opencontainers/runc/libcontainer/selinux"
+	"github.com/opencontainers/selinux/go-selinux"
 )
 
 // Valid Label Options
@@ -25,10 +25,10 @@ var ErrIncompatibleLabel = fmt.Errorf("Bad SELinux option z and Z can not be use
 // the labels.  The labels returned will include a random MCS String, that is
 // guaranteed to be unique.
 func InitLabels(options []string) (string, string, error) {
-	if !selinux.SelinuxEnabled() {
+	if !selinux.GetEnabled() {
 		return "", "", nil
 	}
-	processLabel, mountLabel := selinux.GetLxcContexts()
+	processLabel, mountLabel := selinux.ContainerLabels()
 	if processLabel != "" {
 		pcon := selinux.NewContext(processLabel)
 		mcon := selinux.NewContext(mountLabel)
@@ -55,8 +55,8 @@ func InitLabels(options []string) (string, string, error) {
 	return processLabel, mountLabel, nil
 }
 
-func GetROMountLabel() string {
-	return selinux.GetROFileLabel()
+func ROMountLabel() string {
+	return selinux.ROFileLabel()
 }
 
 // DEPRECATED: The GenLabels function is only to be used during the transition to the official API.
@@ -88,33 +88,33 @@ func SetProcessLabel(processLabel string) error {
 	if processLabel == "" {
 		return nil
 	}
-	return selinux.Setexeccon(processLabel)
+	return selinux.SetExecLabel(processLabel)
 }
 
-// GetProcessLabel returns the process label that the kernel will assign
+// ProcessLabel returns the process label that the kernel will assign
 // to the next program executed by the current process.  If "" is returned
 // this indicates that the default labeling will happen for the process.
-func GetProcessLabel() (string, error) {
-	return selinux.Getexeccon()
+func ProcessLabel() (string, error) {
+	return selinux.ExecLabel()
 }
 
 // GetFileLabel returns the label for specified path
-func GetFileLabel(path string) (string, error) {
-	return selinux.Getfilecon(path)
+func FileLabel(path string) (string, error) {
+	return selinux.FileLabel(path)
 }
 
 // SetFileLabel modifies the "path" label to the specified file label
 func SetFileLabel(path string, fileLabel string) error {
-	if selinux.SelinuxEnabled() && fileLabel != "" {
-		return selinux.Setfilecon(path, fileLabel)
+	if selinux.GetEnabled() && fileLabel != "" {
+		return selinux.SetFileLabel(path, fileLabel)
 	}
 	return nil
 }
 
 // SetFileCreateLabel tells the kernel the label for all files to be created
 func SetFileCreateLabel(fileLabel string) error {
-	if selinux.SelinuxEnabled() {
-		return selinux.Setfscreatecon(fileLabel)
+	if selinux.GetEnabled() {
+		return selinux.SetFSCreateLabel(fileLabel)
 	}
 	return nil
 }
@@ -123,7 +123,7 @@ func SetFileCreateLabel(fileLabel string) error {
 // It changes the MCS label to s0 if shared is true.
 // This will allow all containers to share the content.
 func Relabel(path string, fileLabel string, shared bool) error {
-	if !selinux.SelinuxEnabled() {
+	if !selinux.GetEnabled() {
 		return nil
 	}
 
@@ -147,14 +147,14 @@ func Relabel(path string, fileLabel string, shared bool) error {
 	return nil
 }
 
-// GetPidLabel will return the label of the process running with the specified pid
-func GetPidLabel(pid int) (string, error) {
-	return selinux.Getpidcon(pid)
+// PidLabel will return the label of the process running with the specified pid
+func PidLabel(pid int) (string, error) {
+	return selinux.PidLabel(pid)
 }
 
 // Init initialises the labeling system
 func Init() {
-	selinux.SelinuxEnabled()
+	selinux.GetEnabled()
 }
 
 // ReserveLabel will record the fact that the MCS label has already been used.
@@ -165,15 +165,15 @@ func ReserveLabel(label string) error {
 	return nil
 }
 
-// UnreserveLabel will remove the reservation of the MCS label.
+// ReleaseLabel will remove the reservation of the MCS label.
 // This will allow InitLabels to use the MCS label in a newly created
 // containers
-func UnreserveLabel(label string) error {
-	selinux.FreeLxcContexts(label)
+func ReleaseLabel(label string) error {
+	selinux.ReleaseLabel(label)
 	return nil
 }
 
-// DupSecOpt takes an process label and returns security options that
+// DupSecOpt takes a process label and returns security options that
 // can be used to set duplicate labels on future container processes
 func DupSecOpt(src string) []string {
 	return selinux.DupSecOpt(src)

vendor/github.com/opencontainers/runc/libcontainer/selinux/selinux.go → vendor/github.com/opencontainers/selinux/go-selinux/selinux.go

@@ -15,13 +15,14 @@ import (
 	"strings"
 	"sync"
 	"syscall"
-
-	"github.com/opencontainers/runc/libcontainer/system"
 )
 
 const (
-	Enforcing        = 1
-	Permissive       = 0
+	// Enforcing constant indicate SELinux is in enforcing mode
+	Enforcing = 1
+	// Permissive constant to indicate SELinux is in permissive mode
+	Permissive = 0
+	// Disabled constant to indicate SELinux is disabled
 	Disabled         = -1
 	selinuxDir       = "/etc/selinux/"
 	selinuxConfig    = selinuxDir + "config"
@@ -32,33 +33,74 @@ const (
 	stRdOnly         = 0x01
 )
 
+type selinuxState struct {
+	enabledSet   bool
+	enabled      bool
+	selinuxfsSet bool
+	selinuxfs    string
+	mcsList      map[string]bool
+	sync.Mutex
+}
+
 var (
-	assignRegex           = regexp.MustCompile(`^([^=]+)=(.*)$`)
-	mcsList               = make(map[string]bool)
-	mcsLock               sync.Mutex
-	selinuxfs             = "unknown"
-	selinuxEnabled        = false // Stores whether selinux is currently enabled
-	selinuxEnabledChecked = false // Stores whether selinux enablement has been checked or established yet
+	assignRegex = regexp.MustCompile(`^([^=]+)=(.*)$`)
+	state       = selinuxState{
+		mcsList: make(map[string]bool),
+	}
 )
 
-type SELinuxContext map[string]string
+// Context is a representation of the SELinux label broken into 4 parts
+type Context map[string]string
+
+func (s *selinuxState) setEnable(enabled bool) bool {
+	s.Lock()
+	defer s.Unlock()
+	s.enabledSet = true
+	s.enabled = enabled
+	return s.enabled
+}
+
+func (s *selinuxState) getEnabled() bool {
+	s.Lock()
+	enabled := s.enabled
+	enabledSet := s.enabledSet
+	s.Unlock()
+	if enabledSet {
+		return enabled
+	}
+
+	enabled = false
+	if fs := getSelinuxMountPoint(); fs != "" {
+		if con, _ := CurrentLabel(); con != "kernel" {
+			enabled = true
+		}
+	}
+	return s.setEnable(enabled)
+}
 
 // SetDisabled disables selinux support for the package
 func SetDisabled() {
-	selinuxEnabled, selinuxEnabledChecked = false, true
+	state.setEnable(false)
 }
 
-// getSelinuxMountPoint returns the path to the mountpoint of an selinuxfs
-// filesystem or an empty string if no mountpoint is found.  Selinuxfs is
-// a proc-like pseudo-filesystem that exposes the selinux policy API to
-// processes.  The existence of an selinuxfs mount is used to determine
-// whether selinux is currently enabled or not.
-func getSelinuxMountPoint() string {
-	if selinuxfs != "unknown" {
+func (s *selinuxState) setSELinuxfs(selinuxfs string) string {
+	s.Lock()
+	defer s.Unlock()
+	s.selinuxfsSet = true
+	s.selinuxfs = selinuxfs
+	return s.selinuxfs
+}
+
+func (s *selinuxState) getSELinuxfs() string {
+	s.Lock()
+	selinuxfs := s.selinuxfs
+	selinuxfsSet := s.selinuxfsSet
+	s.Unlock()
+	if selinuxfsSet {
 		return selinuxfs
 	}
-	selinuxfs = ""
 
+	selinuxfs = ""
 	f, err := os.Open("/proc/self/mountinfo")
 	if err != nil {
 		return selinuxfs
@@ -91,21 +133,21 @@ func getSelinuxMountPoint() string {
 			selinuxfs = ""
 		}
 	}
-	return selinuxfs
+	return s.setSELinuxfs(selinuxfs)
 }
 
-// SelinuxEnabled returns whether selinux is currently enabled.
-func SelinuxEnabled() bool {
-	if selinuxEnabledChecked {
-		return selinuxEnabled
-	}
-	selinuxEnabledChecked = true
-	if fs := getSelinuxMountPoint(); fs != "" {
-		if con, _ := Getcon(); con != "kernel" {
-			selinuxEnabled = true
-		}
-	}
-	return selinuxEnabled
+// getSelinuxMountPoint returns the path to the mountpoint of an selinuxfs
+// filesystem or an empty string if no mountpoint is found.  Selinuxfs is
+// a proc-like pseudo-filesystem that exposes the selinux policy API to
+// processes.  The existence of an selinuxfs mount is used to determine
+// whether selinux is currently enabled or not.
+func getSelinuxMountPoint() string {
+	return state.getSELinuxfs()
+}
+
+// GetEnabled returns whether selinux is currently enabled.
+func GetEnabled() bool {
+	return state.getEnabled()
 }
 
 func readConfig(target string) (value string) {
@@ -166,43 +208,55 @@ func readCon(name string) (string, error) {
 	return val, err
 }
 
-// Setfilecon sets the SELinux label for this path or returns an error.
-func Setfilecon(path string, scon string) error {
-	return system.Lsetxattr(path, xattrNameSelinux, []byte(scon), 0)
+// SetFileLabel sets the SELinux label for this path or returns an error.
+func SetFileLabel(path string, label string) error {
+	return lsetxattr(path, xattrNameSelinux, []byte(label), 0)
 }
 
-// Getfilecon returns the SELinux label for this path or returns an error.
-func Getfilecon(path string) (string, error) {
-	con, err := system.Lgetxattr(path, xattrNameSelinux)
+// Filecon returns the SELinux label for this path or returns an error.
+func FileLabel(path string) (string, error) {
+	label, err := lgetxattr(path, xattrNameSelinux)
 	if err != nil {
 		return "", err
 	}
 	// Trim the NUL byte at the end of the byte buffer, if present.
-	if len(con) > 0 && con[len(con)-1] == '\x00' {
-		con = con[:len(con)-1]
+	if len(label) > 0 && label[len(label)-1] == '\x00' {
+		label = label[:len(label)-1]
 	}
-	return string(con), nil
+	return string(label), nil
 }
 
-func Setfscreatecon(scon string) error {
-	return writeCon(fmt.Sprintf("/proc/self/task/%d/attr/fscreate", syscall.Gettid()), scon)
+/*
+SetFSCreateLabel tells kernel the label to create all file system objects
+created by this task. Setting label="" to return to default.
+*/
+func SetFSCreateLabel(label string) error {
+	return writeCon(fmt.Sprintf("/proc/self/task/%d/attr/fscreate", syscall.Gettid()), label)
 }
 
-func Getfscreatecon() (string, error) {
+/*
+FSCreateLabel returns the default label the kernel which the kernel is using
+for file system objects created by this task. "" indicates default.
+*/
+func FSCreateLabel() (string, error) {
 	return readCon(fmt.Sprintf("/proc/self/task/%d/attr/fscreate", syscall.Gettid()))
 }
 
-// Getcon returns the SELinux label of the current process thread, or an error.
-func Getcon() (string, error) {
+// CurrentLabel returns the SELinux label of the current process thread, or an error.
+func CurrentLabel() (string, error) {
 	return readCon(fmt.Sprintf("/proc/self/task/%d/attr/current", syscall.Gettid()))
 }
 
-// Getpidcon returns the SELinux label of the given pid, or an error.
-func Getpidcon(pid int) (string, error) {
+// PidLabel returns the SELinux label of the given pid, or an error.
+func PidLabel(pid int) (string, error) {
 	return readCon(fmt.Sprintf("/proc/%d/attr/current", pid))
 }
 
-func Getexeccon() (string, error) {
+/*
+ExecLabel returns the SELinux label that the kernel will use for any programs
+that are executed by the current process thread, or an error.
+*/
+func ExecLabel() (string, error) {
 	return readCon(fmt.Sprintf("/proc/self/task/%d/attr/exec", syscall.Gettid()))
 }
 
@@ -221,19 +275,25 @@ func writeCon(name string, val string) error {
 	return err
 }
 
-func Setexeccon(scon string) error {
-	return writeCon(fmt.Sprintf("/proc/self/task/%d/attr/exec", syscall.Gettid()), scon)
+/*
+SetExecLabel sets the SELinux label that the kernel will use for any programs
+that are executed by the current process thread, or an error.
+*/
+func SetExecLabel(label string) error {
+	return writeCon(fmt.Sprintf("/proc/self/task/%d/attr/exec", syscall.Gettid()), label)
 }
 
-func (c SELinuxContext) Get() string {
+// Get returns the Context as a string
+func (c Context) Get() string {
 	return fmt.Sprintf("%s:%s:%s:%s", c["user"], c["role"], c["type"], c["level"])
 }
 
-func NewContext(scon string) SELinuxContext {
-	c := make(SELinuxContext)
+// NewContext creates a new Context struct from the specified label
+func NewContext(label string) Context {
+	c := make(Context)
 
-	if len(scon) != 0 {
-		con := strings.SplitN(scon, ":", 4)
+	if len(label) != 0 {
+		con := strings.SplitN(label, ":", 4)
 		c["user"] = con[0]
 		c["role"] = con[1]
 		c["type"] = con[2]
@@ -242,9 +302,10 @@ func NewContext(scon string) SELinuxContext {
 	return c
 }
 
-func ReserveLabel(scon string) {
-	if len(scon) != 0 {
-		con := strings.SplitN(scon, ":", 4)
+// ReserveLabel reserves the MLS/MCS level component of the specified label
+func ReserveLabel(label string) {
+	if len(label) != 0 {
+		con := strings.SplitN(label, ":", 4)
 		mcsAdd(con[3])
 	}
 }
@@ -253,7 +314,8 @@ func selinuxEnforcePath() string {
 	return fmt.Sprintf("%s/enforce", selinuxPath)
 }
 
-func SelinuxGetEnforce() int {
+// EnforceMode returns the current SELinux mode Enforcing, Permissive, Disabled
+func EnforceMode() int {
 	var enforce int
 
 	enforceS, err := readCon(selinuxEnforcePath())
@@ -268,11 +330,20 @@ func SelinuxGetEnforce() int {
 	return enforce
 }
 
-func SelinuxSetEnforce(mode int) error {
+/*
+SetEnforce sets the current SELinux mode Enforcing, Permissive.
+Disabled is not valid, since this needs to be set at boot time.
+*/
+func SetEnforceMode(mode int) error {
 	return writeCon(selinuxEnforcePath(), fmt.Sprintf("%d", mode))
 }
 
-func SelinuxGetEnforceMode() int {
+/*
+DefaultEnforceMode returns the systems default SELinux mode Enforcing,
+Permissive or Disabled. Note this is is just the default at boot time.
+EnforceMode tells you the systems current mode.
+*/
+func DefaultEnforceMode() int {
 	switch readConfig(selinuxTag) {
 	case "enforcing":
 		return Enforcing
@@ -283,22 +354,22 @@ func SelinuxGetEnforceMode() int {
 }
 
 func mcsAdd(mcs string) error {
-	mcsLock.Lock()
-	defer mcsLock.Unlock()
-	if mcsList[mcs] {
+	state.Lock()
+	defer state.Unlock()
+	if state.mcsList[mcs] {
 		return fmt.Errorf("MCS Label already exists")
 	}
-	mcsList[mcs] = true
+	state.mcsList[mcs] = true
 	return nil
 }
 
 func mcsDelete(mcs string) {
-	mcsLock.Lock()
-	mcsList[mcs] = false
-	mcsLock.Unlock()
+	state.Lock()
+	defer state.Unlock()
+	state.mcsList[mcs] = false
 }
 
-func IntToMcs(id int, catRange uint32) string {
+func intToMcs(id int, catRange uint32) string {
 	var (
 		SETSIZE = int(catRange)
 		TIER    = SETSIZE
@@ -334,9 +405,7 @@ func uniqMcs(catRange uint32) string {
 			continue
 		} else {
 			if c1 > c2 {
-				t := c1
-				c1 = c2
-				c2 = t
+				c1, c2 = c2, c1
 			}
 		}
 		mcs = fmt.Sprintf("s0:c%d,c%d", c1, c2)
@@ -348,26 +417,35 @@ func uniqMcs(catRange uint32) string {
 	return mcs
 }
 
-func FreeLxcContexts(scon string) {
-	if len(scon) != 0 {
-		con := strings.SplitN(scon, ":", 4)
+/*
+ReleaseLabel will unreserve the MLS/MCS Level field of the specified label.
+Allowing it to be used by another process.
+*/
+func ReleaseLabel(label string) {
+	if len(label) != 0 {
+		con := strings.SplitN(label, ":", 4)
 		mcsDelete(con[3])
 	}
 }
 
 var roFileLabel string
 
-func GetROFileLabel() (fileLabel string) {
+// ROFileLabel returns the specified SELinux readonly file label
+func ROFileLabel() (fileLabel string) {
 	return roFileLabel
 }
 
-func GetLxcContexts() (processLabel string, fileLabel string) {
+/*
+ContainerLabels returns an allocated processLabel and fileLabel to be used for
+container labeling by the calling process.
+*/
+func ContainerLabels() (processLabel string, fileLabel string) {
 	var (
 		val, key string
 		bufin    *bufio.Reader
 	)
 
-	if !SelinuxEnabled() {
+	if !GetEnabled() {
 		return "", ""
 	}
 	lxcPath := fmt.Sprintf("%s/contexts/lxc_contexts", getSELinuxPolicyRoot())
@@ -419,7 +497,6 @@ func GetLxcContexts() (processLabel string, fileLabel string) {
 		roFileLabel = fileLabel
 	}
 exit:
-	//	mcs := IntToMcs(os.Getpid(), 1024)
 	mcs := uniqMcs(1024)
 	scon := NewContext(processLabel)
 	scon["level"] = mcs
@@ -430,10 +507,15 @@ exit:
 	return processLabel, fileLabel
 }
 
+// SecurityCheckContext validates that the SELinux label is understood by the kernel
 func SecurityCheckContext(val string) error {
 	return writeCon(fmt.Sprintf("%s.context", selinuxPath), val)
 }
 
+/*
+CopyLevel returns a label with the MLS/MCS level from src label replaces on
+the dest label.
+*/
 func CopyLevel(src, dest string) (string, error) {
 	if src == "" {
 		return "", nil
@@ -458,31 +540,31 @@ func badPrefix(fpath string) error {
 
 	for _, prefix := range badprefixes {
 		if fpath == prefix || strings.HasPrefix(fpath, fmt.Sprintf("%s/", prefix)) {
-			return fmt.Errorf("Relabeling content in %s is not allowed.", prefix)
+			return fmt.Errorf("relabeling content in %s is not allowed", prefix)
 		}
 	}
 	return nil
 }
 
-// Chcon changes the fpath file object to the SELinux label scon.
+// Chcon changes the fpath file object to the SELinux label label.
 // If the fpath is a directory and recurse is true Chcon will walk the
 // directory tree setting the label
-func Chcon(fpath string, scon string, recurse bool) error {
-	if scon == "" {
+func Chcon(fpath string, label string, recurse bool) error {
+	if label == "" {
 		return nil
 	}
 	if err := badPrefix(fpath); err != nil {
 		return err
 	}
 	callback := func(p string, info os.FileInfo, err error) error {
-		return Setfilecon(p, scon)
+		return SetFileLabel(p, label)
 	}
 
 	if recurse {
 		return filepath.Walk(fpath, callback)
 	}
 
-	return Setfilecon(fpath, scon)
+	return SetFileLabel(fpath, label)
 }
 
 // DupSecOpt takes an SELinux process label and returns security options that
@@ -498,14 +580,14 @@ func DupSecOpt(src string) []string {
 		con["level"] == "" {
 		return nil
 	}
-	return []string{"label=user:" + con["user"],
-		"label=role:" + con["role"],
-		"label=type:" + con["type"],
-		"label=level:" + con["level"]}
+	return []string{"user:" + con["user"],
+		"role:" + con["role"],
+		"type:" + con["type"],
+		"level:" + con["level"]}
 }
 
 // DisableSecOpt returns a security opt that can be used to disabling SELinux
 // labeling support for future container processes
 func DisableSecOpt() []string {
-	return []string{"label=disable"}
+	return []string{"disable"}
 }

vendor/github.com/opencontainers/selinux/go-selinux/xattrs.go

@@ -0,0 +1,78 @@
+// +build linux
+
+package selinux
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+var _zero uintptr
+
+// Returns a []byte slice if the xattr is set and nil otherwise
+// Requires path and its attribute as arguments
+func lgetxattr(path string, attr string) ([]byte, error) {
+	var sz int
+	pathBytes, err := syscall.BytePtrFromString(path)
+	if err != nil {
+		return nil, err
+	}
+	attrBytes, err := syscall.BytePtrFromString(attr)
+	if err != nil {
+		return nil, err
+	}
+
+	// Start with a 128 length byte array
+	sz = 128
+	dest := make([]byte, sz)
+	destBytes := unsafe.Pointer(&dest[0])
+	_sz, _, errno := syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(pathBytes)), uintptr(unsafe.Pointer(attrBytes)), uintptr(destBytes), uintptr(len(dest)), 0, 0)
+
+	switch {
+	case errno == syscall.ENODATA:
+		return nil, errno
+	case errno == syscall.ENOTSUP:
+		return nil, errno
+	case errno == syscall.ERANGE:
+		// 128 byte array might just not be good enough,
+		// A dummy buffer is used ``uintptr(0)`` to get real size
+		// of the xattrs on disk
+		_sz, _, errno = syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(pathBytes)), uintptr(unsafe.Pointer(attrBytes)), uintptr(unsafe.Pointer(nil)), uintptr(0), 0, 0)
+		sz = int(_sz)
+		if sz < 0 {
+			return nil, errno
+		}
+		dest = make([]byte, sz)
+		destBytes := unsafe.Pointer(&dest[0])
+		_sz, _, errno = syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(pathBytes)), uintptr(unsafe.Pointer(attrBytes)), uintptr(destBytes), uintptr(len(dest)), 0, 0)
+		if errno != 0 {
+			return nil, errno
+		}
+	case errno != 0:
+		return nil, errno
+	}
+	sz = int(_sz)
+	return dest[:sz], nil
+}
+
+func lsetxattr(path string, attr string, data []byte, flags int) error {
+	pathBytes, err := syscall.BytePtrFromString(path)
+	if err != nil {
+		return err
+	}
+	attrBytes, err := syscall.BytePtrFromString(attr)
+	if err != nil {
+		return err
+	}
+	var dataBytes unsafe.Pointer
+	if len(data) > 0 {
+		dataBytes = unsafe.Pointer(&data[0])
+	} else {
+		dataBytes = unsafe.Pointer(&_zero)
+	}
+	_, _, errno := syscall.Syscall6(syscall.SYS_LSETXATTR, uintptr(unsafe.Pointer(pathBytes)), uintptr(unsafe.Pointer(attrBytes)), uintptr(dataBytes), uintptr(len(data)), uintptr(flags), 0)
+	if errno != 0 {
+		return errno
+	}
+	return nil
+}

volume/volume.go

@@ -10,7 +10,7 @@ import (
 	mounttypes "github.com/docker/docker/api/types/mount"
 	"github.com/docker/docker/pkg/idtools"
 	"github.com/docker/docker/pkg/stringid"
-	"github.com/opencontainers/runc/libcontainer/label"
+	"github.com/opencontainers/selinux/go-selinux/label"
 	"github.com/pkg/errors"
 )