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Use opencontainers/selinux package 

It's splitted as a separate project.

Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
This commit is contained in:
Qiang Huang 2017-03-23 08:21:19 +08:00
parent ef9a4b3155
commit 5e7b48f7c0
13 changed files with 411 additions and 313 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
libcontainer/configs/validate/validator.go
View File

@ -7,7 +7,7 @@ import (
"strings"
"github.com/opencontainers/runc/libcontainer/configs"
"github.com/opencontainers/runc/libcontainer/selinux"
selinux "github.com/opencontainers/selinux/go-selinux"
)
type Validator interface {
@ -87,7 +87,7 @@ func (v *ConfigValidator) security(config *configs.Config) error {
!config.Namespaces.Contains(configs.NEWNS) {
return fmt.Errorf("unable to restrict sys entries without a private MNT namespace")
}
if config.ProcessLabel != "" && !selinux.SelinuxEnabled() {
if config.ProcessLabel != "" && !selinux.GetEnabled() {
return fmt.Errorf("selinux label is specified in config, but selinux is disabled or not supported")
}

148
libcontainer/label/label_selinux_test.go
View File

@ -1,148 +0,0 @@
// +build selinux,linux
package label
import (
"os"
"strings"
"testing"
"github.com/opencontainers/runc/libcontainer/selinux"
)
func TestInit(t *testing.T) {
if selinux.SelinuxEnabled() {
var testNull []string
plabel, mlabel, err := InitLabels(testNull)
if err != nil {
t.Log("InitLabels Failed")
t.Fatal(err)
}
testDisabled := []string{"disable"}
roMountLabel := GetROMountLabel()
if roMountLabel == "" {
t.Errorf("GetROMountLabel Failed")
}
plabel, mlabel, err = InitLabels(testDisabled)
if err != nil {
t.Log("InitLabels Disabled Failed")
t.Fatal(err)
}
if plabel != "" {
t.Log("InitLabels Disabled Failed")
t.FailNow()
}
testUser := []string{"user:user_u", "role:user_r", "type:user_t", "level:s0:c1,c15"}
plabel, mlabel, err = InitLabels(testUser)
if err != nil {
t.Log("InitLabels User Failed")
t.Fatal(err)
}
if plabel != "user_u:user_r:user_t:s0:c1,c15" || mlabel != "user_u:object_r:svirt_sandbox_file_t:s0:c1,c15" {
t.Log("InitLabels User Match Failed")
t.Log(plabel, mlabel)
t.Fatal(err)
}
testBadData := []string{"user", "role:user_r", "type:user_t", "level:s0:c1,c15"}
if _, _, err = InitLabels(testBadData); err == nil {
t.Log("InitLabels Bad Failed")
t.Fatal(err)
}
}
}
func TestDuplicateLabel(t *testing.T) {
secopt := DupSecOpt("system_u:system_r:svirt_lxc_net_t:s0:c1,c2")
t.Log(secopt)
for _, opt := range secopt {
parts := strings.SplitN(opt, "=", 2)
if len(parts) != 2 || parts[0] != "label" {
t.Errorf("Invalid DupSecOpt return value")
continue
}
con := strings.SplitN(parts[1], ":", 2)
if con[0] == "user" {
if con[1] != "system_u" {
t.Errorf("DupSecOpt Failed user incorrect")
}
continue
}
if con[0] == "role" {
if con[1] != "system_r" {
t.Errorf("DupSecOpt Failed role incorrect")
}
continue
}
if con[0] == "type" {
if con[1] != "svirt_lxc_net_t" {
t.Errorf("DupSecOpt Failed type incorrect")
}
continue
}
if con[0] == "level" {
if con[1] != "s0:c1,c2" {
t.Errorf("DupSecOpt Failed level incorrect")
}
continue
}
t.Errorf("DupSecOpt Failed invalid field %q", con[0])
}
secopt = DisableSecOpt()
if secopt[0] != "label=disable" {
t.Errorf("DisableSecOpt Failed level incorrect")
}
}
func TestRelabel(t *testing.T) {
testdir := "/tmp/test"
if err := os.Mkdir(testdir, 0755); err != nil {
t.Fatal(err)
}
defer os.RemoveAll(testdir)
label := "system_u:object_r:svirt_sandbox_file_t:s0:c1,c2"
if err := Relabel(testdir, "", true); err != nil {
t.Fatalf("Relabel with no label failed: %v", err)
}
if err := Relabel(testdir, label, true); err != nil {
t.Fatalf("Relabel shared failed: %v", err)
}
if err := Relabel(testdir, label, false); err != nil {
t.Fatalf("Relabel unshared failed: %v", err)
}
if err := Relabel("/etc", label, false); err == nil {
t.Fatalf("Relabel /etc succeeded")
}
if err := Relabel("/", label, false); err == nil {
t.Fatalf("Relabel / succeeded")
}
if err := Relabel("/usr", label, false); err == nil {
t.Fatalf("Relabel /usr succeeded")
}
}
func TestValidate(t *testing.T) {
if err := Validate("zZ"); err != ErrIncompatibleLabel {
t.Fatalf("Expected incompatible error, got %v", err)
}
if err := Validate("Z"); err != nil {
t.Fatal(err)
}
if err := Validate("z"); err != nil {
t.Fatal(err)
}
if err := Validate(""); err != nil {
t.Fatal(err)
}
}
func TestIsShared(t *testing.T) {
if shared := IsShared("Z"); shared {
t.Fatalf("Expected label `Z` to not be shared, got %v", shared)
}
if shared := IsShared("z"); !shared {
t.Fatalf("Expected label `z` to be shared, got %v", shared)
}
if shared := IsShared("Zz"); !shared {
t.Fatalf("Expected label `Zz` to be shared, got %v", shared)
}
}

2
libcontainer/rootfs_linux.go
View File

@ -19,9 +19,9 @@ import (
"github.com/mrunalp/fileutils"
"github.com/opencontainers/runc/libcontainer/cgroups"
"github.com/opencontainers/runc/libcontainer/configs"
"github.com/opencontainers/runc/libcontainer/label"
"github.com/opencontainers/runc/libcontainer/system"
libcontainerUtils "github.com/opencontainers/runc/libcontainer/utils"
"github.com/opencontainers/selinux/go-selinux/label"
)
const defaultMountFlags = syscall.MS_NOEXEC | syscall.MS_NOSUID | syscall.MS_NODEV

85
libcontainer/selinux/selinux_test.go
View File

@ -1,85 +0,0 @@
// +build linux,selinux
package selinux_test
import (
"os"
"testing"
"github.com/opencontainers/runc/libcontainer/selinux"
)
func TestSetfilecon(t *testing.T) {
if selinux.SelinuxEnabled() {
tmp := "selinux_test"
con := "system_u:object_r:bin_t:s0"
out, _ := os.OpenFile(tmp, os.O_WRONLY|os.O_CREATE, 0)
out.Close()
err := selinux.Setfilecon(tmp, con)
if err != nil {
t.Log("Setfilecon failed")
t.Fatal(err)
}
filecon, err := selinux.Getfilecon(tmp)
if err != nil {
t.Log("Getfilecon failed")
t.Fatal(err)
}
if con != filecon {
t.Fatal("Getfilecon failed, returned %s expected %s", filecon, con)
}
os.Remove(tmp)
}
}
func TestSELinux(t *testing.T) {
var (
err error
plabel, flabel string
)
if selinux.SelinuxEnabled() {
t.Log("Enabled")
plabel, flabel = selinux.GetLxcContexts()
t.Log(plabel)
t.Log(flabel)
selinux.FreeLxcContexts(plabel)
plabel, flabel = selinux.GetLxcContexts()
t.Log(plabel)
t.Log(flabel)
selinux.FreeLxcContexts(plabel)
t.Log("getenforce ", selinux.SelinuxGetEnforce())
mode := selinux.SelinuxGetEnforceMode()
t.Log("getenforcemode ", mode)
defer selinux.SelinuxSetEnforce(mode)
if err := selinux.SelinuxSetEnforce(selinux.Enforcing); err != nil {
t.Fatalf("enforcing selinux failed: %v", err)
}
if err := selinux.SelinuxSetEnforce(selinux.Permissive); err != nil {
t.Fatalf("setting selinux mode to permissive failed: %v", err)
}
selinux.SelinuxSetEnforce(mode)
pid := os.Getpid()
t.Logf("PID:%d MCS:%s\n", pid, selinux.IntToMcs(pid, 1023))
err = selinux.Setfscreatecon("unconfined_u:unconfined_r:unconfined_t:s0")
if err == nil {
t.Log(selinux.Getfscreatecon())
} else {
t.Log("setfscreatecon failed", err)
t.Fatal(err)
}
err = selinux.Setfscreatecon("")
if err == nil {
t.Log(selinux.Getfscreatecon())
} else {
t.Log("setfscreatecon failed", err)
t.Fatal(err)
}
t.Log(selinux.Getpidcon(1))
} else {
t.Log("Disabled")
}
}

2
libcontainer/setns_init_linux.go
View File

@ -8,9 +8,9 @@ import (
"github.com/opencontainers/runc/libcontainer/apparmor"
"github.com/opencontainers/runc/libcontainer/keys"
"github.com/opencontainers/runc/libcontainer/label"
"github.com/opencontainers/runc/libcontainer/seccomp"
"github.com/opencontainers/runc/libcontainer/system"
"github.com/opencontainers/selinux/go-selinux/label"
)
// linuxSetnsInit performs the container's initialization for running a new process

2
libcontainer/standard_init_linux.go
View File

@ -11,9 +11,9 @@ import (
"github.com/opencontainers/runc/libcontainer/apparmor"
"github.com/opencontainers/runc/libcontainer/configs"
"github.com/opencontainers/runc/libcontainer/keys"
"github.com/opencontainers/runc/libcontainer/label"
"github.com/opencontainers/runc/libcontainer/seccomp"
"github.com/opencontainers/runc/libcontainer/system"
"github.com/opencontainers/selinux/go-selinux/label"
)
type linuxStandardInit struct {

1
vendor.conf
View File

@ -7,6 +7,7 @@ github.com/godbus/dbus c7fdd8b5cd55e87b4e1f4e372cdb1db61dd6c66f
github.com/golang/protobuf/proto f7137ae6b19afbfd61a94b746fda3b3fe0491874
github.com/mrunalp/fileutils ed869b029674c0e9ce4c0dfa781405c2d9946d08
github.com/opencontainers/runtime-spec/specs-go 035da1dca3dfbb00d752eb58b0b158d6129f3776
github.com/opencontainers/selinux ba1aefe8057f1d0cfb8e88d0ec1dc85925ef987d
github.com/seccomp/libseccomp-golang 32f571b70023028bd57d9288c20efbcb237f3ce0
github.com/syndtr/gocapability/capability e7cb7fa329f456b3855136a2642b197bad7366ba
github.com/urfave/cli d53eb991652b1d438abdd34ce4bfa3ef1539108e

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
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
}

46
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.
@ -165,11 +165,11 @@ 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
}

146
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"
@ -48,7 +49,8 @@ var (
}
)
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()
@ -69,7 +71,7 @@ func (s *selinuxState) getEnabled() bool {
enabled = false
if fs := getSelinuxMountPoint(); fs != "" {
if con, _ := Getcon(); con != "kernel" {
if con, _ := CurrentLabel(); con != "kernel" {
enabled = true
}
}
@ -143,8 +145,8 @@ func getSelinuxMountPoint() string {
return state.getSELinuxfs()
}
// SelinuxEnabled returns whether selinux is currently enabled.
func SelinuxEnabled() bool {
// GetEnabled returns whether selinux is currently enabled.
func GetEnabled() bool {
return state.getEnabled()
}
@ -206,43 +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()))
}
@ -261,19 +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]
@ -282,9 +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])
}
}
@ -293,7 +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())
@ -308,11 +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
@ -338,7 +369,7 @@ func mcsDelete(mcs string) {
state.mcsList[mcs] = false
}
func IntToMcs(id int, catRange uint32) string {
func intToMcs(id int, catRange uint32) string {
var (
SETSIZE = int(catRange)
TIER = SETSIZE
@ -386,26 +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())
@ -457,7 +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
@ -468,10 +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
@ -502,25 +546,25 @@ func badPrefix(fpath string) error {
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

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
}