Merge pull request #44268 from thaJeztah/idtools_cleanup3
pkg/idtools: remove CanAccess(), and move to daemon
This commit is contained in:
commit
1c550c36b3
3 changed files with 52 additions and 41 deletions
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@ -15,6 +15,7 @@ import (
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"strconv"
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"strings"
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"sync"
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"syscall"
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"time"
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"github.com/containerd/cgroups"
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@ -1247,7 +1248,7 @@ func setupDaemonRoot(config *config.Config, rootDir string, remappedRoot idtools
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if dirPath == "/" {
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break
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}
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if !idtools.CanAccess(dirPath, remappedRoot) {
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if !canAccess(dirPath, remappedRoot) {
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return fmt.Errorf("a subdirectory in your graphroot path (%s) restricts access to the remapped root uid/gid; please fix by allowing 'o+x' permissions on existing directories", config.Root)
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}
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}
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@ -1259,6 +1260,34 @@ func setupDaemonRoot(config *config.Config, rootDir string, remappedRoot idtools
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return nil
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}
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// canAccess takes a valid (existing) directory and a uid, gid pair and determines
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// if that uid, gid pair has access (execute bit) to the directory.
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//
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// Note: this is a very rudimentary check, and may not produce accurate results,
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// so should not be used for anything other than the current use, see:
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// https://github.com/moby/moby/issues/43724
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func canAccess(path string, pair idtools.Identity) bool {
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statInfo, err := os.Stat(path)
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if err != nil {
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return false
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}
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perms := statInfo.Mode().Perm()
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if perms&0o001 == 0o001 {
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// world access
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return true
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}
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ssi := statInfo.Sys().(*syscall.Stat_t)
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if ssi.Uid == uint32(pair.UID) && (perms&0o100 == 0o100) {
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// owner access.
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return true
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}
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if ssi.Gid == uint32(pair.GID) && (perms&0o010 == 0o010) {
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// group access.
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return true
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}
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return false
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}
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func setupDaemonRootPropagation(cfg *config.Config) error {
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rootParentMount, mountOptions, err := getSourceMount(cfg.Root)
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if err != nil {
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@ -14,7 +14,6 @@ import (
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"sync"
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"syscall"
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"github.com/docker/docker/pkg/system"
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"github.com/opencontainers/runc/libcontainer/user"
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)
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@ -29,7 +28,7 @@ func mkdirAs(path string, mode os.FileMode, owner Identity, mkAll, chownExisting
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return err
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}
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stat, err := system.Stat(path)
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stat, err := os.Stat(path)
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if err == nil {
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if !stat.IsDir() {
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return &os.PathError{Op: "mkdir", Path: path, Err: syscall.ENOTDIR}
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@ -38,8 +37,8 @@ func mkdirAs(path string, mode os.FileMode, owner Identity, mkAll, chownExisting
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return nil
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}
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// short-circuit--we were called with an existing directory and chown was requested
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return setPermissions(path, mode, owner.UID, owner.GID, stat)
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// short-circuit -- we were called with an existing directory and chown was requested
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return setPermissions(path, mode, owner, stat)
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}
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// make an array containing the original path asked for, plus (for mkAll == true)
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@ -60,51 +59,26 @@ func mkdirAs(path string, mode os.FileMode, owner Identity, mkAll, chownExisting
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if dirPath == "/" {
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break
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}
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if _, err := os.Stat(dirPath); err != nil && os.IsNotExist(err) {
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if _, err = os.Stat(dirPath); err != nil && os.IsNotExist(err) {
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paths = append(paths, dirPath)
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}
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}
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if err := os.MkdirAll(path, mode); err != nil {
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return err
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}
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} else {
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if err := os.Mkdir(path, mode); err != nil && !os.IsExist(err) {
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if err = os.MkdirAll(path, mode); err != nil {
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return err
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}
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} else if err = os.Mkdir(path, mode); err != nil {
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return err
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}
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// even if it existed, we will chown the requested path + any subpaths that
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// didn't exist when we called MkdirAll
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for _, pathComponent := range paths {
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if err := setPermissions(pathComponent, mode, owner.UID, owner.GID, nil); err != nil {
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if err = setPermissions(pathComponent, mode, owner, nil); err != nil {
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return err
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}
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}
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return nil
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}
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// CanAccess takes a valid (existing) directory and a uid, gid pair and determines
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// if that uid, gid pair has access (execute bit) to the directory
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func CanAccess(path string, pair Identity) bool {
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statInfo, err := system.Stat(path)
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if err != nil {
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return false
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}
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perms := os.FileMode(statInfo.Mode()).Perm()
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if perms&0o001 == 0o001 {
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// world access
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return true
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}
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if statInfo.UID() == uint32(pair.UID) && (perms&0o100 == 0o100) {
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// owner access.
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return true
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}
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if statInfo.GID() == uint32(pair.GID) && (perms&0o010 == 0o010) {
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// group access.
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return true
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}
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return false
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}
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// LookupUser uses traditional local system files lookup (from libcontainer/user) on a username,
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// followed by a call to `getent` for supporting host configured non-files passwd and group dbs
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func LookupUser(name string) (user.User, error) {
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@ -229,23 +203,24 @@ func getExitCode(err error) (int, error) {
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// Normally a Chown is a no-op if uid/gid match, but in some cases this can still cause an error, e.g. if the
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// dir is on an NFS share, so don't call chown unless we absolutely must.
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// Likewise for setting permissions.
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func setPermissions(p string, mode os.FileMode, uid, gid int, stat *system.StatT) error {
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func setPermissions(p string, mode os.FileMode, owner Identity, stat os.FileInfo) error {
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if stat == nil {
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var err error
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stat, err = system.Stat(p)
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stat, err = os.Stat(p)
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if err != nil {
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return err
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}
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}
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if os.FileMode(stat.Mode()).Perm() != mode.Perm() {
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if stat.Mode().Perm() != mode.Perm() {
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if err := os.Chmod(p, mode.Perm()); err != nil {
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return err
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}
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}
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if stat.UID() == uint32(uid) && stat.GID() == uint32(gid) {
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ssi := stat.Sys().(*syscall.Stat_t)
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if ssi.Uid == uint32(owner.UID) && ssi.Gid == uint32(owner.GID) {
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return nil
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}
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return os.Chown(p, uid, gid)
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return os.Chown(p, owner.UID, owner.GID)
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}
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// LoadIdentityMapping takes a requested username and
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@ -6,8 +6,10 @@ package idtools // import "github.com/docker/docker/pkg/idtools"
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import (
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"fmt"
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"os"
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"os/exec"
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"os/user"
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"path/filepath"
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"syscall"
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"testing"
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"golang.org/x/sys/unix"
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@ -425,7 +427,12 @@ func TestNewIDMappings(t *testing.T) {
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err = MkdirAllAndChown(dirName, 0o700, Identity{UID: rootUID, GID: rootGID})
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assert.Check(t, err, "Couldn't change ownership of file path. Got error")
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assert.Check(t, CanAccess(dirName, idMapping.RootPair()), "Unable to access %s directory with user UID:%d and GID:%d", dirName, rootUID, rootGID)
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cmd := exec.Command("ls", "-la", dirName)
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cmd.SysProcAttr = &syscall.SysProcAttr{
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Credential: &syscall.Credential{Uid: uint32(rootUID), Gid: uint32(rootGID)},
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}
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out, err := cmd.CombinedOutput()
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assert.Check(t, err, "Unable to access %s directory with user UID:%d and GID:%d:\n%s", dirName, rootUID, rootGID, string(out))
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}
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func TestLookupUserAndGroup(t *testing.T) {
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