105 lines
2.7 KiB
Go
105 lines
2.7 KiB
Go
package dockerfile // import "github.com/docker/docker/builder/dockerfile"
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import (
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"fmt"
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"os"
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"path/filepath"
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"strings"
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winio "github.com/Microsoft/go-winio"
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"github.com/docker/docker/pkg/idtools"
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"github.com/docker/docker/pkg/reexec"
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"github.com/docker/docker/pkg/system"
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"github.com/pkg/errors"
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"golang.org/x/sys/windows"
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)
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var pathDenyList = map[string]bool{
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"c:\\": true,
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"c:\\windows": true,
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}
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func init() {
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reexec.Register("windows-fix-permissions", fixPermissionsReexec)
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}
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func fixPermissions(source, destination string, identity idtools.Identity, _ bool) error {
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if identity.SID == "" {
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return nil
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}
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cmd := reexec.Command("windows-fix-permissions", source, destination, identity.SID)
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output, err := cmd.CombinedOutput()
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return errors.Wrapf(err, "failed to exec windows-fix-permissions: %s", output)
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}
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func fixPermissionsReexec() {
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err := fixPermissionsWindows(os.Args[1], os.Args[2], os.Args[3])
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if err != nil {
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fmt.Fprint(os.Stderr, err)
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os.Exit(1)
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}
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}
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func fixPermissionsWindows(source, destination, SID string) error {
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privileges := []string{winio.SeRestorePrivilege, system.SeTakeOwnershipPrivilege}
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err := winio.EnableProcessPrivileges(privileges)
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if err != nil {
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return err
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}
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defer winio.DisableProcessPrivileges(privileges)
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sid, err := windows.StringToSid(SID)
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if err != nil {
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return err
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}
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// Owners on *nix have read/write/delete/read control and write DAC.
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// Add an ACE that grants this to the user/group specified with the
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// chown option. Currently Windows is not honoring the owner change,
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// however, they are aware of this and it should be fixed at some
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// point.
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sddlString := system.SddlAdministratorsLocalSystem
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sddlString += "(A;OICI;GRGWGXRCWDSD;;;" + SID + ")"
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securityDescriptor, err := windows.SecurityDescriptorFromString(sddlString)
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if err != nil {
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return err
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}
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dacl, _, err := securityDescriptor.DACL()
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if err != nil {
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return err
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}
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return windows.SetNamedSecurityInfo(destination, windows.SE_FILE_OBJECT, windows.OWNER_SECURITY_INFORMATION|windows.DACL_SECURITY_INFORMATION, sid, nil, dacl, nil)
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}
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func validateCopySourcePath(imageSource *imageMount, origPath, platform string) error {
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// validate windows paths from other images + LCOW
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if imageSource == nil || platform != "windows" {
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return nil
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}
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origPath = filepath.FromSlash(origPath)
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p := strings.ToLower(filepath.Clean(origPath))
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if !filepath.IsAbs(p) {
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if filepath.VolumeName(p) != "" {
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if p[len(p)-2:] == ":." { // case where clean returns weird c:. paths
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p = p[:len(p)-1]
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}
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p += "\\"
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} else {
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p = filepath.Join("c:\\", p)
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}
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}
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if _, ok := pathDenyList[p]; ok {
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return errors.New("copy from c:\\ or c:\\windows is not allowed on windows")
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}
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return nil
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}
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