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backup: fix reading xattrs on Windows for root disks as regular user 

Unprivileged users cannot open the root disks with write permissions for
xattrs. Thus, only request read permissions for reading the xattrs.
This commit is contained in:
Michael Eischer 2024-06-14 22:36:07 +02:00
parent 20a6c526e5
commit c01b655229
2 changed files with 10 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
internal/fs/file_windows.go
View File

@ -105,17 +105,20 @@ func ClearAttribute(path string, attribute uint32) error {
}
// OpenHandleForEA return a file handle for file or dir for setting/getting EAs
func OpenHandleForEA(nodeType, path string) (handle windows.Handle, err error) {
func OpenHandleForEA(nodeType, path string, writeAccess bool) (handle windows.Handle, err error) {
path = fixpath(path)
fileAccess := windows.FILE_READ_EA
if writeAccess {
fileAccess = fileAccess | windows.FILE_WRITE_EA
}
switch nodeType {
case "file":
utf16Path := windows.StringToUTF16Ptr(path)
fileAccessRightReadWriteEA := (0x8 | 0x10)
handle, err = windows.CreateFile(utf16Path, uint32(fileAccessRightReadWriteEA), 0, nil, windows.OPEN_EXISTING, windows.FILE_ATTRIBUTE_NORMAL, 0)
handle, err = windows.CreateFile(utf16Path, uint32(fileAccess), 0, nil, windows.OPEN_EXISTING, windows.FILE_ATTRIBUTE_NORMAL, 0)
case "dir":
utf16Path := windows.StringToUTF16Ptr(path)
fileAccessRightReadWriteEA := (0x8 | 0x10)
handle, err = windows.CreateFile(utf16Path, uint32(fileAccessRightReadWriteEA), 0, nil, windows.OPEN_EXISTING, windows.FILE_ATTRIBUTE_NORMAL|windows.FILE_FLAG_BACKUP_SEMANTICS, 0)
handle, err = windows.CreateFile(utf16Path, uint32(fileAccess), 0, nil, windows.OPEN_EXISTING, windows.FILE_ATTRIBUTE_NORMAL|windows.FILE_FLAG_BACKUP_SEMANTICS, 0)
default:
return 0, nil
}

4
internal/restic/node_windows.go
View File

@ -88,7 +88,7 @@ func (node Node) restoreExtendedAttributes(path string) (err error) {
// fill extended attributes in the node. This also includes the Generic attributes for windows.
func (node *Node) fillExtendedAttributes(path string, _ bool) (err error) {
var fileHandle windows.Handle
if fileHandle, err = fs.OpenHandleForEA(node.Type, path); fileHandle == 0 {
if fileHandle, err = fs.OpenHandleForEA(node.Type, path, false); fileHandle == 0 {
return nil
}
if err != nil {
@ -130,7 +130,7 @@ func closeFileHandle(fileHandle windows.Handle, path string) {
// The Windows API requires setting of all the Extended Attributes in one call.
func restoreExtendedAttributes(nodeType, path string, eas []fs.ExtendedAttribute) (err error) {
var fileHandle windows.Handle
if fileHandle, err = fs.OpenHandleForEA(nodeType, path); fileHandle == 0 {
if fileHandle, err = fs.OpenHandleForEA(nodeType, path, true); fileHandle == 0 {
return nil
}
if err != nil {