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Switch to using opencontainers/selinux for selinux bindings

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Signed-off-by: Antonio Murdaca <runcom@redhat.com>
This commit is contained in:
Antonio Murdaca 2017-04-18 15:26:36 +02:00
parent 3482b45e60
commit abbbf91498
No known key found for this signature in database
GPG key ID: B2BEAD150DE936B9
23 changed files with 515 additions and 139 deletions
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2
container/container.go
View file

@ -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"

2
container/container_unix.go
View file

@ -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"
)

2
daemon/container_operations_unix.go
View file

@ -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"
)

17
daemon/create.go
View file

@ -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
}

2
daemon/create_unix.go
View file

@ -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

2
daemon/daemon_solaris.go
View file

@ -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"
)

2
daemon/daemon_unix.go
View file

@ -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"
)

2
daemon/graphdriver/aufs/aufs.go
View file

@ -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 (

2
daemon/graphdriver/btrfs/btrfs.go
View file

@ -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() {

2
daemon/graphdriver/devmapper/deviceset.go
View file

@ -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 (

2
daemon/graphdriver/overlay/overlay.go
View file

@ -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

2
daemon/graphdriver/overlay2/overlay.go
View file

@ -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 (

2
daemon/graphdriver/vfs/driver.go
View file

@ -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 (

2
daemon/graphdriver/zfs/zfs.go
View file

@ -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 {

6
daemon/selinux_linux.go
View file

@ -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()
}

1
vendor.conf
View file

@ -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

201
vendor/github.com/opencontainers/selinux/LICENSE generated vendored Normal file
View file

@ -0,0 +1,201 @@
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7
vendor/github.com/opencontainers/selinux/README.md generated vendored Normal file
View file

@ -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.

2
vendor/github.com/opencontainers/runc/libcontainer/label/label.go → vendor/github.com/opencontainers/selinux/go-selinux/label/label.go generated vendored
View file

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

48
vendor/github.com/opencontainers/runc/libcontainer/label/label_selinux.go → vendor/github.com/opencontainers/selinux/go-selinux/label/label_selinux.go generated vendored
View file

@ -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)

266
vendor/github.com/opencontainers/runc/libcontainer/selinux/selinux.go → vendor/github.com/opencontainers/selinux/go-selinux/selinux.go generated vendored
View file

@ -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"}
}

78
vendor/github.com/opencontainers/selinux/go-selinux/xattrs.go generated vendored Normal file
View file

@ -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
}

2
volume/volume.go
View file

@ -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"
)