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path: root/vendor/github.com/opencontainers/selinux/go-selinux/selinux_linux.go
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Diffstat (limited to 'vendor/github.com/opencontainers/selinux/go-selinux/selinux_linux.go')
-rw-r--r--vendor/github.com/opencontainers/selinux/go-selinux/selinux_linux.go123
1 files changed, 72 insertions, 51 deletions
diff --git a/vendor/github.com/opencontainers/selinux/go-selinux/selinux_linux.go b/vendor/github.com/opencontainers/selinux/go-selinux/selinux_linux.go
index 9fcfd0867..0e97a0778 100644
--- a/vendor/github.com/opencontainers/selinux/go-selinux/selinux_linux.go
+++ b/vendor/github.com/opencontainers/selinux/go-selinux/selinux_linux.go
@@ -11,6 +11,7 @@ import (
"io"
"io/ioutil"
"os"
+ "path"
"path/filepath"
"regexp"
"strconv"
@@ -37,15 +38,14 @@ const (
selinuxTag = "SELINUX"
xattrNameSelinux = "security.selinux"
stRdOnly = 0x01
- selinuxfsMagic = 0xf97cff8c
)
type selinuxState struct {
- enabledSet bool
- enabled bool
- selinuxfsSet bool
- selinuxfs string
- mcsList map[string]bool
+ enabledSet bool
+ enabled bool
+ selinuxfsOnce sync.Once
+ selinuxfs string
+ mcsList map[string]bool
sync.Mutex
}
@@ -62,6 +62,10 @@ var (
state = selinuxState{
mcsList: make(map[string]bool),
}
+
+ // for attrPath()
+ attrPathOnce sync.Once
+ haveThreadSelf bool
)
// Context is a representation of the SELinux label broken into 4 parts
@@ -98,14 +102,6 @@ func SetDisabled() {
state.setEnable(false)
}
-func (s *selinuxState) setSELinuxfs(selinuxfs string) string {
- s.Lock()
- defer s.Unlock()
- s.selinuxfsSet = true
- s.selinuxfs = selinuxfs
- return s.selinuxfs
-}
-
func verifySELinuxfsMount(mnt string) bool {
var buf syscall.Statfs_t
for {
@@ -118,7 +114,8 @@ func verifySELinuxfsMount(mnt string) bool {
}
return false
}
- if uint32(buf.Type) != uint32(selinuxfsMagic) {
+
+ if buf.Type != unix.SELINUX_MAGIC {
return false
}
if (buf.Flags & stRdOnly) != 0 {
@@ -166,33 +163,29 @@ func findSELinuxfs() string {
// if there is one, or an empty string in case of EOF or error.
func findSELinuxfsMount(s *bufio.Scanner) string {
for s.Scan() {
- txt := s.Text()
+ txt := s.Bytes()
// The first field after - is fs type.
// Safe as spaces in mountpoints are encoded as \040
- if !strings.Contains(txt, " - selinuxfs ") {
+ if !bytes.Contains(txt, []byte(" - selinuxfs ")) {
continue
}
const mPos = 5 // mount point is 5th field
- fields := strings.SplitN(txt, " ", mPos+1)
+ fields := bytes.SplitN(txt, []byte(" "), mPos+1)
if len(fields) < mPos+1 {
continue
}
- return fields[mPos-1]
+ return string(fields[mPos-1])
}
return ""
}
func (s *selinuxState) getSELinuxfs() string {
- s.Lock()
- selinuxfs := s.selinuxfs
- selinuxfsSet := s.selinuxfsSet
- s.Unlock()
- if selinuxfsSet {
- return selinuxfs
- }
+ s.selinuxfsOnce.Do(func() {
+ s.selinuxfs = findSELinuxfs()
+ })
- return s.setSELinuxfs(findSELinuxfs())
+ return s.selinuxfs
}
// getSelinuxMountPoint returns the path to the mountpoint of an selinuxfs
@@ -254,10 +247,17 @@ func getSELinuxPolicyRoot() string {
return filepath.Join(selinuxDir, readConfig(selinuxTypeTag))
}
-func isProcHandle(fh *os.File) (bool, error) {
+func isProcHandle(fh *os.File) error {
var buf unix.Statfs_t
err := unix.Fstatfs(int(fh.Fd()), &buf)
- return buf.Type == unix.PROC_SUPER_MAGIC, err
+ if err != nil {
+ return fmt.Errorf("statfs(%q) failed: %v", fh.Name(), err)
+ }
+ if buf.Type != unix.PROC_SUPER_MAGIC {
+ return fmt.Errorf("file %q is not on procfs", fh.Name())
+ }
+
+ return nil
}
func readCon(fpath string) (string, error) {
@@ -271,10 +271,8 @@ func readCon(fpath string) (string, error) {
}
defer in.Close()
- if ok, err := isProcHandle(in); err != nil {
+ if err := isProcHandle(in); err != nil {
return "", err
- } else if !ok {
- return "", fmt.Errorf("%s not on procfs", fpath)
}
var retval string
@@ -317,7 +315,7 @@ 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)
+ return writeAttr("fscreate", label)
}
/*
@@ -325,12 +323,12 @@ 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()))
+ return readAttr("fscreate")
}
// 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()))
+ return readAttr("current")
}
// PidLabel returns the SELinux label of the given pid, or an error.
@@ -343,10 +341,10 @@ 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()))
+ return readAttr("exec")
}
-func writeCon(fpath string, val string) error {
+func writeCon(fpath, val string) error {
if fpath == "" {
return ErrEmptyPath
}
@@ -362,10 +360,8 @@ func writeCon(fpath string, val string) error {
}
defer out.Close()
- if ok, err := isProcHandle(out); err != nil {
+ if err := isProcHandle(out); err != nil {
return err
- } else if !ok {
- return fmt.Errorf("%s not on procfs", fpath)
}
if val != "" {
@@ -379,6 +375,32 @@ func writeCon(fpath string, val string) error {
return nil
}
+func attrPath(attr string) string {
+ // Linux >= 3.17 provides this
+ const threadSelfPrefix = "/proc/thread-self/attr"
+
+ attrPathOnce.Do(func() {
+ st, err := os.Stat(threadSelfPrefix)
+ if err == nil && st.Mode().IsDir() {
+ haveThreadSelf = true
+ }
+ })
+
+ if haveThreadSelf {
+ return path.Join(threadSelfPrefix, attr)
+ }
+
+ return path.Join("/proc/self/task/", strconv.Itoa(syscall.Gettid()), "/attr/", attr)
+}
+
+func readAttr(attr string) (string, error) {
+ return readCon(attrPath(attr))
+}
+
+func writeAttr(attr, val string) error {
+ return writeCon(attrPath(attr), val)
+}
+
/*
CanonicalizeContext takes a context string and writes it to the kernel
the function then returns the context that the kernel will use. This function
@@ -415,7 +437,7 @@ 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)
+ return writeAttr("exec", label)
}
/*
@@ -423,18 +445,18 @@ SetTaskLabel sets the SELinux label for the current thread, or an error.
This requires the dyntransition permission.
*/
func SetTaskLabel(label string) error {
- return writeCon(fmt.Sprintf("/proc/self/task/%d/attr/current", syscall.Gettid()), label)
+ return writeAttr("current", label)
}
// SetSocketLabel takes a process label and tells the kernel to assign the
// label to the next socket that gets created
func SetSocketLabel(label string) error {
- return writeCon(fmt.Sprintf("/proc/self/task/%d/attr/sockcreate", syscall.Gettid()), label)
+ return writeAttr("sockcreate", label)
}
// SocketLabel retrieves the current socket label setting
func SocketLabel() (string, error) {
- return readCon(fmt.Sprintf("/proc/self/task/%d/attr/sockcreate", syscall.Gettid()))
+ return readAttr("sockcreate")
}
// PeerLabel retrieves the label of the client on the other side of a socket
@@ -449,7 +471,7 @@ func SetKeyLabel(label string) error {
if os.IsNotExist(err) {
return nil
}
- if label == "" && os.IsPermission(err) && !GetEnabled() {
+ if label == "" && os.IsPermission(err) {
return nil
}
return err
@@ -505,19 +527,18 @@ func ReserveLabel(label string) {
}
func selinuxEnforcePath() string {
- return fmt.Sprintf("%s/enforce", getSelinuxMountPoint())
+ return path.Join(getSelinuxMountPoint(), "enforce")
}
// EnforceMode returns the current SELinux mode Enforcing, Permissive, Disabled
func EnforceMode() int {
var enforce int
- enforceS, err := readCon(selinuxEnforcePath())
+ enforceB, err := ioutil.ReadFile(selinuxEnforcePath())
if err != nil {
return -1
}
-
- enforce, err = strconv.Atoi(string(enforceS))
+ enforce, err = strconv.Atoi(string(enforceB))
if err != nil {
return -1
}
@@ -529,7 +550,7 @@ SetEnforceMode 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))
+ return ioutil.WriteFile(selinuxEnforcePath(), []byte(strconv.Itoa(mode)), 0644)
}
/*
@@ -711,7 +732,7 @@ exit:
// SecurityCheckContext validates that the SELinux label is understood by the kernel
func SecurityCheckContext(val string) error {
- return writeCon(fmt.Sprintf("%s/context", getSelinuxMountPoint()), val)
+ return ioutil.WriteFile(path.Join(getSelinuxMountPoint(), "context"), []byte(val), 0644)
}
/*
generated by cgit v1.2.3-54-g00ecf (git 2.39.0) at 2024-11-12 16:11:12 +0000